tx.c 71.2 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

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

#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "wme.h"
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#include "rate.h"
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#define IEEE80211_TX_OK		0
#define IEEE80211_TX_AGAIN	1
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#define IEEE80211_TX_PENDING	2
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/* misc utils */

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
				 int next_frag_len)
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{
	int rate, mrate, erp, dur, i;
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	struct ieee80211_rate *txrate;
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	struct ieee80211_local *local = tx->local;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_hdr *hdr;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	/* assume HW handles this */
	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
		return 0;

	/* uh huh? */
	if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
		return 0;
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	sband = local->hw.wiphy->bands[tx->channel->band];
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	txrate = &sband->bitrates[info->control.rates[0].idx];
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	erp = txrate->flags & IEEE80211_RATE_ERP_G;
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	/*
	 * data and mgmt (except PS Poll):
	 * - during CFP: 32768
	 * - during contention period:
	 *   if addr1 is group address: 0
	 *   if more fragments = 0 and addr1 is individual address: time to
	 *      transmit one ACK plus SIFS
	 *   if more fragments = 1 and addr1 is individual address: time to
	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
	 *
	 * IEEE 802.11, 9.6:
	 * - control response frame (CTS or ACK) shall be transmitted using the
	 *   same rate as the immediately previous frame in the frame exchange
	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
	 *   at the highest possible rate belonging to the PHY rates in the
	 *   BSSBasicRateSet
	 */
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	hdr = (struct ieee80211_hdr *)tx->skb->data;
	if (ieee80211_is_ctl(hdr->frame_control)) {
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		/* TODO: These control frames are not currently sent by
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		 * mac80211, but should they be implemented, this function
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		 * needs to be updated to support duration field calculation.
		 *
		 * RTS: time needed to transmit pending data/mgmt frame plus
		 *    one CTS frame plus one ACK frame plus 3 x SIFS
		 * CTS: duration of immediately previous RTS minus time
		 *    required to transmit CTS and its SIFS
		 * ACK: 0 if immediately previous directed data/mgmt had
		 *    more=0, with more=1 duration in ACK frame is duration
		 *    from previous frame minus time needed to transmit ACK
		 *    and its SIFS
		 * PS Poll: BIT(15) | BIT(14) | aid
		 */
		return 0;
	}

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

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

		switch (sband->band) {
		case IEEE80211_BAND_2GHZ: {
			u32 flag;
			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
				flag = IEEE80211_RATE_MANDATORY_G;
			else
				flag = IEEE80211_RATE_MANDATORY_B;
			if (r->flags & flag)
				mrate = r->bitrate;
			break;
		}
		case IEEE80211_BAND_5GHZ:
			if (r->flags & IEEE80211_RATE_MANDATORY_A)
				mrate = r->bitrate;
			break;
		case IEEE80211_NUM_BANDS:
			WARN_ON(1);
			break;
		}
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	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
		rate = mrate;
	}

	/* Time needed to transmit ACK
	 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
	 * to closest integer */

	dur = ieee80211_frame_duration(local, 10, rate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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	if (next_frag_len) {
		/* Frame is fragmented: duration increases with time needed to
		 * transmit next fragment plus ACK and 2 x SIFS. */
		dur *= 2; /* ACK + SIFS */
		/* next fragment */
		dur += ieee80211_frame_duration(local, next_frag_len,
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				txrate->bitrate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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	}

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	return cpu_to_le16(dur);
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}

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static int inline is_ieee80211_device(struct ieee80211_local *local,
				      struct net_device *dev)
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{
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	return local == wdev_priv(dev->ieee80211_ptr);
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}

/* tx handlers */
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static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
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	struct ieee80211_if_managed *ifmgd;
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	/* driver doesn't support power save */
	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
		return TX_CONTINUE;

	/* hardware does dynamic power save */
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
		return TX_CONTINUE;

	/* dynamic power save disabled */
	if (local->hw.conf.dynamic_ps_timeout <= 0)
		return TX_CONTINUE;

	/* we are scanning, don't enable power save */
	if (local->scanning)
		return TX_CONTINUE;

	if (!local->ps_sdata)
		return TX_CONTINUE;

	/* No point if we're going to suspend */
	if (local->quiescing)
		return TX_CONTINUE;

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	/* dynamic ps is supported only in managed mode */
	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
		return TX_CONTINUE;

	ifmgd = &tx->sdata->u.mgd;

	/*
	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
	 * u-apsd enabled and the frame is in voip class. This effectively
	 * means that even if all access categories have u-apsd enabled, in
	 * practise u-apsd is only used with the voip ac. This is a
	 * workaround for the case when received voip class packets do not
	 * have correct qos tag for some reason, due the network or the
	 * peer application.
	 *
	 * Note: local->uapsd_queues access is racy here. If the value is
	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
	    && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
	    && skb_get_queue_mapping(tx->skb) == 0)
		return TX_CONTINUE;

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	u32 sta_flags;

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

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

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

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	return TX_CONTINUE;
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}

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

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

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

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

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

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

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

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

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

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

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

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

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ieee80211_local *local = tx->local;
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	u32 staflags;
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	if (unlikely(!sta ||
		     ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_auth(hdr->frame_control) ||
		     ieee80211_is_assoc_resp(hdr->frame_control) ||
		     ieee80211_is_reassoc_resp(hdr->frame_control)))
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		return TX_CONTINUE;
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	staflags = get_sta_flags(sta);

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

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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		skb_queue_tail(&sta->ps_tx_buf, tx->skb);
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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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

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	return TX_CONTINUE;
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}

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

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

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

	return TX_CONTINUE;
}

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

	if (tx->key) {
560 561
		bool skip_hw = false;

562
		tx->key->tx_rx_count++;
563
		/* TODO: add threshold stuff again */
564

565 566 567
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
568
			if (ieee80211_is_auth(hdr->frame_control))
569
				break;
570
		case WLAN_CIPHER_SUITE_TKIP:
571
			if (!ieee80211_is_data_present(hdr->frame_control))
572 573
				tx->key = NULL;
			break;
574
		case WLAN_CIPHER_SUITE_CCMP:
575 576 577 578
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
579 580 581 582
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
583
			break;
584
		case WLAN_CIPHER_SUITE_AES_CMAC:
585 586 587
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
588
		}
589

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590
		if (!skip_hw && tx->key &&
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591
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
592
			info->control.hw_key = &tx->key->conf;
593 594
	}

595
	return TX_CONTINUE;
596 597
}

598
static ieee80211_tx_result debug_noinline
599
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
600
{
601
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
602 603 604
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
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Shanyu Zhao 已提交
605 606
	int i;
	u32 len;
607 608
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
609
	u32 sta_flags;
610

611
	memset(&txrc, 0, sizeof(txrc));
612

613
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
614

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615
	len = min_t(u32, tx->skb->len + FCS_LEN,
616
			 tx->local->hw.wiphy->frag_threshold);
617 618 619 620 621 622 623

	/* set up the tx rate control struct we give the RC algo */
	txrc.hw = local_to_hw(tx->local);
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
624 625 626 627 628
	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;
629 630
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
631 632

	/* set up RTS protection if desired */
633
	if (len > tx->local->hw.wiphy->rts_threshold) {
634
		txrc.rts = rts = true;
635 636
	}

637 638 639 640 641 642 643 644 645 646
	/*
	 * Use short preamble if the BSS can handle it, but not for
	 * management frames unless we know the receiver can handle
	 * that -- the management frame might be to a station that
	 * just wants a probe response.
	 */
	if (tx->sdata->vif.bss_conf.use_short_preamble &&
	    (ieee80211_is_data(hdr->frame_control) ||
	     (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
		txrc.short_preamble = short_preamble = true;
647

648 649 650 651 652 653
	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
654
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
655 656 657 658 659
		 (sta_flags & WLAN_STA_ASSOC) &&
		 !rate_usable_index_exists(sband, &tx->sta->sta),
		 "%s: Dropped data frame as no usable bitrate found while "
		 "scanning and associated. Target station: "
		 "%pM on %d GHz band\n",
660
		 tx->sdata->name, hdr->addr1,
661 662
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
663

664 665 666 667
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
668 669 670 671 672
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

673
	if (txrc.reported_rate.idx < 0) {
674
		txrc.reported_rate = info->control.rates[0];
675 676 677
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
678
		tx->sta->last_tx_rate = txrc.reported_rate;
679

680 681
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
682

683 684 685 686
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

687 688 689 690 691
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
692 693
	}

694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	/*
	 * 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;
719 720
	}

721 722 723 724 725 726 727 728 729 730 731 732 733 734
	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;
		}
735

736 737 738 739 740 741 742 743
		/*
		 * 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;
		}
744

745 746 747 748
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
749

750
		/* RC is busted */
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		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
753 754
			info->control.rates[i].idx = -1;
			continue;
755
		}
756

757 758 759 760 761 762 763 764 765 766 767 768 769
		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;
770 771
	}

772 773 774
	return TX_CONTINUE;
}

775 776 777 778 779 780 781 782 783
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;

784 785 786 787 788
	/*
	 * 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.
	 */
789
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
790 791
		return TX_CONTINUE;

792 793 794 795 796 797
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

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798 799 800 801 802
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
803
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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804
		/* driver should assign sequence number */
805
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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806 807 808
		/* 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;
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
		return TX_CONTINUE;
	}

	/*
	 * This should be true for injected/management frames only, for
	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
	 * above since they are not QoS-data frames.
	 */
	if (!tx->sta)
		return TX_CONTINUE;

	/* include per-STA, per-TID sequence counter */

	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	seq = &tx->sta->tid_seq[tid];

	hdr->seq_ctrl = cpu_to_le16(*seq);

	/* Increase the sequence number. */
	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;

	return TX_CONTINUE;
}

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834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
static int ieee80211_fragment(struct ieee80211_local *local,
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
	struct sk_buff *tail = skb, *tmp;
	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
	int pos = hdrlen + per_fragm;
	int rem = skb->len - hdrlen - per_fragm;

	if (WARN_ON(rem < 0))
		return -EINVAL;

	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
				    IEEE80211_ENCRYPT_HEADROOM +
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
		tail->next = tmp;
		tail = tmp;
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
		skb_copy_queue_mapping(tmp, skb);
		tmp->priority = skb->priority;
		tmp->dev = skb->dev;

		/* copy header and data */
		memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
		memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);

		pos += fraglen;
	}

	skb->len = hdrlen + per_fragm;
	return 0;
}

879
static ieee80211_tx_result debug_noinline
880 881
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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882 883 884
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
885
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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886 887
	int hdrlen;
	int fragnum;
888 889 890 891

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

892 893
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
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894
	 * This scenario is handled in ieee80211_tx_prepare but extra
895
	 * caution taken here as fragmented ampdu may cause Tx stop.
896
	 */
S
Sujith 已提交
897
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
898 899
		return TX_DROP;

900
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
901

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Johannes Berg 已提交
902
	/* internal error, why is TX_FRAGMENTED set? */
903
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
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904
		return TX_DROP;
905

J
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906 907 908 909 910 911 912 913 914 915
	/*
	 * Now fragment the frame. This will allocate all the fragments and
	 * chain them (using skb as the first fragment) to skb->next.
	 * During transmission, we will remove the successfully transmitted
	 * fragments from this list. When the low-level driver rejects one
	 * of the fragments then we will simply pretend to accept the skb
	 * but store it away as pending.
	 */
	if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
		return TX_DROP;
916

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917 918 919 920 921
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
922

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923 924
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
925

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926 927 928
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
929 930 931 932 933 934 935 936 937 938
			/*
			 * No multi-rate retries for fragmented frames, that
			 * would completely throw off the NAV at other STAs.
			 */
			info->control.rates[1].idx = -1;
			info->control.rates[2].idx = -1;
			info->control.rates[3].idx = -1;
			info->control.rates[4].idx = -1;
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
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939 940 941
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
942
		}
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943 944 945 946
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
947

948
	return TX_CONTINUE;
949 950
}

951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
	do {
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}

968
static ieee80211_tx_result debug_noinline
969 970
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
971 972
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

973 974 975
	if (!tx->key)
		return TX_CONTINUE;

976 977 978
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
979
		return ieee80211_crypto_wep_encrypt(tx);
980
	case WLAN_CIPHER_SUITE_TKIP:
981
		return ieee80211_crypto_tkip_encrypt(tx);
982
	case WLAN_CIPHER_SUITE_CCMP:
983
		return ieee80211_crypto_ccmp_encrypt(tx);
984
	case WLAN_CIPHER_SUITE_AES_CMAC:
985
		return ieee80211_crypto_aes_cmac_encrypt(tx);
986 987 988 989 990 991 992 993
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

994 995 996 997 998
	}

	return TX_DROP;
}

999
static ieee80211_tx_result debug_noinline
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1000 1001
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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1002 1003 1004 1005
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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1006

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1007 1008
	do {
		hdr = (void *) skb->data;
1009 1010
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
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1011 1012
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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1013

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1014 1015 1016
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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1017 1018 1019 1020

	return TX_CONTINUE;
}

1021 1022 1023 1024 1025 1026
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
1027 1028
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
{
	/*
	 * this is the moment to interpret and discard the radiotap header that
	 * must be at the start of the packet injected in Monitor mode
	 *
	 * Need to take some care with endian-ness since radiotap
	 * args are little-endian
	 */

	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
1041
	struct ieee80211_supported_band *sband;
1042
	bool hw_frag;
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1043
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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1044 1045
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1046

1047
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1048

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1049
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1050
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1051

1052 1053 1054
	/* packet is fragmented in HW if we have a non-NULL driver callback */
	hw_frag = (tx->local->ops->set_frag_threshold != NULL);

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

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

		if (ret)
			continue;

		/* see if this argument is something we can use */
		switch (iterator.this_arg_index) {
		/*
		 * You must take care when dereferencing iterator.this_arg
		 * for multibyte types... the pointer is not aligned.  Use
		 * get_unaligned((type *)iterator.this_arg) to dereference
		 * iterator.this_arg for type "type" safely on all arches.
		*/
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
				/*
				 * this indicates that the skb we have been
				 * handed has the 32-bit FCS CRC at the end...
				 * we should react to that by snipping it off
				 * because it will be recomputed and added
				 * on transmission
				 */
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1084
				if (skb->len < (iterator._max_length + FCS_LEN))
1085
					return false;
1086 1087 1088

				skb_trim(skb, skb->len - FCS_LEN);
			}
1089
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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1090
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1091 1092
			if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
								!hw_frag)
1093
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1094 1095
			break;

1096 1097 1098 1099 1100 1101
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1102 1103 1104 1105 1106 1107
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1108
		return false;
1109 1110 1111

	/*
	 * remove the radiotap header
J
Johannes Berg 已提交
1112
	 * iterator->_max_length was sanity-checked against
1113 1114
	 * skb->len by iterator init
	 */
J
Johannes Berg 已提交
1115
	skb_pull(skb, iterator._max_length);
1116

1117
	return true;
1118 1119
}

1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1130 1131 1132 1133 1134
	} 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
		 */
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
		tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];

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

	return queued;
}

1173 1174 1175
/*
 * initialises @tx
 */
1176
static ieee80211_tx_result
J
Johannes Berg 已提交
1177 1178 1179
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1180
{
J
Johannes Berg 已提交
1181
	struct ieee80211_local *local = sdata->local;
1182
	struct ieee80211_hdr *hdr;
1183
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
S
Sujith 已提交
1184
	int hdrlen, tid;
1185
	u8 *qc;
1186 1187 1188 1189

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1190
	tx->sdata = sdata;
1191
	tx->channel = local->hw.conf.channel;
1192
	/*
1193 1194
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1195
	 * Only valid when fragmentation is done by the stack.
1196
	 */
1197 1198
	if (!local->ops->set_frag_threshold)
		tx->flags |= IEEE80211_TX_FRAGMENTED;
1199 1200

	/* process and remove the injection radiotap header */
1201
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1202
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1203
			return TX_DROP;
1204

1205
		/*
1206 1207 1208
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1209
		 */
1210
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1211 1212
	}

1213 1214 1215 1216 1217 1218 1219
	/*
	 * 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;

1220 1221
	hdr = (struct ieee80211_hdr *) skb->data;

1222
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1223
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1224 1225
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1226 1227
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1228
	}
1229
	if (!tx->sta)
1230
		tx->sta = sta_info_get(sdata, hdr->addr1);
1231

1232 1233 1234 1235
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1236 1237 1238
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1239 1240 1241
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1242

1243 1244 1245 1246 1247 1248
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1249 1250
	}

1251
	if (is_multicast_ether_addr(hdr->addr1)) {
1252
		tx->flags &= ~IEEE80211_TX_UNICAST;
1253
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1254
	} else {
1255
		tx->flags |= IEEE80211_TX_UNICAST;
1256 1257 1258 1259
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1260
	}
1261

1262 1263
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1264
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1265
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1266
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1267
		else
1268
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1269 1270
	}

1271
	if (!tx->sta)
1272
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1273
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1274
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1275

1276
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1277 1278 1279 1280
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1281
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1282

1283
	return TX_CONTINUE;
1284 1285
}

J
Johannes Berg 已提交
1286
static int __ieee80211_tx(struct ieee80211_local *local,
1287
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1288 1289
			  struct sta_info *sta,
			  bool txpending)
1290
{
1291
	struct sk_buff *skb = *skbp, *next;
1292
	struct ieee80211_tx_info *info;
1293
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1294
	unsigned long flags;
1295
	int ret, len;
J
Johannes Berg 已提交
1296
	bool fragm = false;
1297

J
Johannes Berg 已提交
1298
	while (skb) {
J
Johannes Berg 已提交
1299
		int q = skb_get_queue_mapping(skb);
1300
		__le16 fc;
J
Johannes Berg 已提交
1301 1302 1303 1304 1305 1306 1307 1308 1309

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		ret = IEEE80211_TX_OK;
		if (local->queue_stop_reasons[q] ||
		    (!txpending && !skb_queue_empty(&local->pending[q])))
			ret = IEEE80211_TX_PENDING;
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
		if (ret != IEEE80211_TX_OK)
			return ret;
1310

1311 1312 1313
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1314
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1315
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1316

J
Johannes Berg 已提交
1317
		next = skb->next;
1318
		len = skb->len;
1319

J
Johannes Berg 已提交
1320 1321 1322
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
		sdata = vif_to_sdata(info->control.vif);

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_MONITOR:
			info->control.vif = NULL;
			break;
		case NL80211_IFTYPE_AP_VLAN:
			info->control.vif = &container_of(sdata->bss,
				struct ieee80211_sub_if_data, u.ap)->vif;
			break;
		default:
			/* keep */
			break;
		}

J
Johannes Berg 已提交
1338 1339 1340 1341 1342
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1343
		fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1344
		ret = drv_tx(local, skb);
1345 1346 1347 1348
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1349 1350
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1351
			return IEEE80211_TX_AGAIN;
1352 1353
		}

1354
		ieee80211_tpt_led_trig_tx(local, fc, len);
1355
		*skbp = skb = next;
J
Johannes Berg 已提交
1356 1357
		ieee80211_led_tx(local, 1);
		fragm = true;
1358
	}
J
Johannes Berg 已提交
1359

1360 1361 1362
	return IEEE80211_TX_OK;
}

1363 1364 1365 1366 1367 1368 1369
/*
 * Invoke TX handlers, return 0 on success and non-zero if the
 * frame was dropped or queued.
 */
static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;
1370
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1371 1372
	ieee80211_tx_result res = TX_DROP;

1373 1374 1375 1376 1377 1378 1379
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1380
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1381 1382
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1383
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1384
	CALL_TXH(ieee80211_tx_h_select_key);
1385 1386
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1387 1388 1389 1390 1391

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1392 1393
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1394
	/* handlers after fragment must be aware of tx info fragmentation! */
1395 1396 1397
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1398
#undef CALL_TXH
1399

1400
 txh_done:
1401
	if (unlikely(res == TX_DROP)) {
1402
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1403 1404 1405 1406 1407 1408 1409
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1410 1411
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1412
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1413 1414 1415 1416 1417 1418
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1419 1420
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1421
{
J
Johannes Berg 已提交
1422
	struct ieee80211_local *local = sdata->local;
1423
	struct ieee80211_tx_data tx;
1424
	ieee80211_tx_result res_prepare;
1425
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1426 1427 1428
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1429
	u16 queue;
1430

1431 1432
	queue = skb_get_queue_mapping(skb);

1433 1434
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1435
		return;
1436 1437
	}

1438 1439
	rcu_read_lock();

1440
	/* initialises tx */
J
Johannes Berg 已提交
1441
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1442

1443
	if (unlikely(res_prepare == TX_DROP)) {
1444
		dev_kfree_skb(skb);
1445
		rcu_read_unlock();
1446 1447 1448 1449
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1450 1451
	}

1452
	tx.channel = local->hw.conf.channel;
1453
	info->band = tx.channel->band;
1454

1455 1456
	if (invoke_tx_handlers(&tx))
		goto out;
1457

1458 1459
	retries = 0;
 retry:
J
Johannes Berg 已提交
1460
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1461 1462 1463 1464
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1465 1466 1467 1468 1469
		/*
		 * Since there are no fragmented frames on A-MPDU
		 * queues, there's no reason for a driver to reject
		 * a frame there, warn and drop it.
		 */
1470 1471 1472 1473 1474
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1475

1476
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1477

J
Johannes Berg 已提交
1478 1479 1480 1481 1482 1483
		if (local->queue_stop_reasons[queue] ||
		    !skb_queue_empty(&local->pending[queue])) {
			/*
			 * if queue is stopped, queue up frames for later
			 * transmission from the tasklet
			 */
1484 1485 1486
			do {
				next = skb->next;
				skb->next = NULL;
1487
				if (unlikely(txpending))
J
Johannes Berg 已提交
1488 1489
					__skb_queue_head(&local->pending[queue],
							 skb);
1490
				else
J
Johannes Berg 已提交
1491 1492
					__skb_queue_tail(&local->pending[queue],
							 skb);
1493 1494 1495 1496 1497
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1498 1499 1500 1501
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1502 1503 1504 1505
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1506
			if (WARN(retries > 10, "tx refused but queue active\n"))
1507
				goto drop;
1508 1509 1510
			goto retry;
		}
	}
1511
 out:
1512
	rcu_read_unlock();
1513
	return;
1514 1515

 drop:
1516
	rcu_read_unlock();
J
Johannes Berg 已提交
1517 1518 1519 1520 1521 1522 1523

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1524 1525 1526 1527
}

/* device xmit handlers */

1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
static int ieee80211_skb_resize(struct ieee80211_local *local,
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
	int tail_need = 0;

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

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

	if (skb_header_cloned(skb))
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1552
	else if (head_need || tail_need)
1553
		I802_DEBUG_INC(local->tx_expand_skb_head);
1554 1555
	else
		return 0;
1556 1557

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1558 1559
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1560 1561 1562 1563 1564 1565 1566 1567 1568
		return -ENOMEM;
	}

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

	return 0;
}

J
Johannes Berg 已提交
1569 1570
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1571
{
J
Johannes Berg 已提交
1572
	struct ieee80211_local *local = sdata->local;
1573
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1574
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1575
	struct ieee80211_sub_if_data *tmp_sdata;
1576
	int headroom;
1577
	bool may_encrypt;
1578

1579 1580
	rcu_read_lock();

1581
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1582 1583 1584
		int hdrlen;
		u16 len_rthdr;

1585 1586
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1587 1588

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1589
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
		hdrlen = ieee80211_hdrlen(hdr->frame_control);

		/* check the header is complete in the frame */
		if (likely(skb->len >= len_rthdr + hdrlen)) {
			/*
			 * We process outgoing injected frames that have a
			 * local address we handle as though they are our
			 * own frames.
			 * This code here isn't entirely correct, the local
			 * MAC address is not necessarily enough to find
			 * the interface to use; for that proper VLAN/WDS
			 * support we will need a different mechanism.
			 */

J
Johannes Berg 已提交
1604
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1605
						list) {
1606
				if (!ieee80211_sdata_running(tmp_sdata))
1607
					continue;
1608 1609 1610 1611 1612 1613
				if (tmp_sdata->vif.type ==
				    NL80211_IFTYPE_MONITOR ||
				    tmp_sdata->vif.type ==
				    NL80211_IFTYPE_AP_VLAN ||
					tmp_sdata->vif.type ==
				    NL80211_IFTYPE_WDS)
1614
					continue;
1615
				if (compare_ether_addr(tmp_sdata->vif.addr,
1616
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1617
					sdata = tmp_sdata;
1618 1619 1620 1621
					break;
				}
			}
		}
1622 1623
	}

J
Johannes Berg 已提交
1624
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1625

J
Johannes Berg 已提交
1626
	headroom = local->tx_headroom;
1627 1628 1629 1630 1631
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1632
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1633
		dev_kfree_skb(skb);
1634
		rcu_read_unlock();
J
Johannes Berg 已提交
1635
		return;
1636 1637
	}

1638
	hdr = (struct ieee80211_hdr *) skb->data;
1639
	info->control.vif = &sdata->vif;
1640

1641 1642 1643 1644 1645
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
		!is_multicast_ether_addr(hdr->addr1))
			if (mesh_nexthop_lookup(skb, sdata)) {
				/* skb queued: don't free */
1646
				rcu_read_unlock();
1647 1648 1649
				return;
			}

1650
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1651
	ieee80211_tx(sdata, skb, false);
1652
	rcu_read_unlock();
1653 1654
}

1655 1656
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1657 1658
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1659
	struct ieee80211_channel *chan = local->hw.conf.channel;
1660 1661
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1662
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1663
	u16 len_rthdr;
1664

1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684
	/*
	 * 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;

1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
	/* 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 */
1699 1700 1701 1702 1703 1704 1705

	/*
	 * 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
	 */
1706
	skb_set_mac_header(skb, len_rthdr);
1707
	/*
1708 1709
	 * 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
1710
	 */
1711 1712
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1713

J
Johannes Berg 已提交
1714 1715
	memset(info, 0, sizeof(*info));

1716 1717
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1718 1719
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1720
	return NETDEV_TX_OK;
1721 1722 1723 1724

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
}

/**
 * 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).
 */
1742 1743
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1744
{
1745 1746
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1747
	struct ieee80211_tx_info *info;
1748
	int ret = NETDEV_TX_BUSY, head_need;
1749 1750
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1751
	struct ieee80211_hdr hdr;
1752
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1753
	struct mesh_path *mppath = NULL;
1754 1755
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1756
	int nh_pos, h_pos;
1757
	struct sta_info *sta = NULL;
1758
	u32 sta_flags = 0;
1759
	struct sk_buff *tmp_skb;
1760 1761

	if (unlikely(skb->len < ETH_HLEN)) {
1762
		ret = NETDEV_TX_OK;
1763 1764 1765 1766 1767 1768
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1769
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1770

1771
	switch (sdata->vif.type) {
1772
	case NL80211_IFTYPE_AP_VLAN:
1773
		rcu_read_lock();
1774
		sta = rcu_dereference(sdata->u.vlan.sta);
1775 1776 1777 1778
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1779
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
			sta_flags = get_sta_flags(sta);
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1790
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1791 1792
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1793
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1794 1795
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1796
		break;
1797
	case NL80211_IFTYPE_WDS:
1798
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1799 1800
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1801
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1802 1803 1804
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1805
		break;
1806
#ifdef CONFIG_MAC80211_MESH
1807
	case NL80211_IFTYPE_MESH_POINT:
1808
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1809
			/* Do not send frames with mesh_ttl == 0 */
1810
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1811
			ret = NETDEV_TX_OK;
1812
			goto fail;
1813
		}
1814 1815
		if (!is_multicast_ether_addr(skb->data))
			mppath = mpp_path_lookup(skb->data, sdata);
1816

1817 1818 1819 1820 1821
		/*
		 * Do not use address extension, if it is a packet from
		 * the same interface and the destination is not being
		 * proxied by any other mest point.
		 */
1822
		if (compare_ether_addr(sdata->vif.addr,
1823 1824
				       skb->data + ETH_ALEN) == 0 &&
		    (!mppath || !compare_ether_addr(mppath->mpp, skb->data))) {
1825 1826 1827
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1828
					sdata, NULL, NULL);
1829 1830
		} else {
			/* packet from other interface */
1831
			int is_mesh_mcast = 1;
1832
			const u8 *mesh_da;
1833

1834
			rcu_read_lock();
1835
			if (is_multicast_ether_addr(skb->data))
1836 1837
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1838
			else {
1839 1840
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1841 1842 1843 1844
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1845
				} else {
1846
					/* DA TA mSA AE:SA */
1847 1848
					mesh_da = bcast;
				}
1849
			}
1850
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1851
					mesh_da, sdata->vif.addr);
1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
			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);
1865 1866

		}
1867 1868
		break;
#endif
1869
	case NL80211_IFTYPE_STATION:
1870
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1871 1872
		if (sdata->u.mgd.use_4addr &&
		    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1873 1874
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1875
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
		} else {
			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
			/* BSSID SA DA */
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1886
		break;
1887
	case NL80211_IFTYPE_ADHOC:
1888 1889 1890
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1891
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1892
		hdrlen = 24;
1893 1894
		break;
	default:
1895
		ret = NETDEV_TX_OK;
1896 1897 1898
		goto fail;
	}

1899 1900 1901 1902 1903 1904
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
	if (!is_multicast_ether_addr(hdr.addr1)) {
1905
		rcu_read_lock();
1906 1907
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1908
			sta_flags = get_sta_flags(sta);
1909
		rcu_read_unlock();
1910 1911
	}

1912
	/* receiver and we are QoS enabled, use a QoS type frame */
1913
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1914
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1915 1916 1917 1918
		hdrlen += 2;
	}

	/*
1919 1920
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1921
	 */
1922 1923
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1924
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
1925
		      !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1926
		       compare_ether_addr(sdata->vif.addr,
1927 1928 1929
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1930
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1931
			       " (unauthorized port)\n", dev->name,
1932
			       hdr.addr1);
1933 1934 1935 1936
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1937
		ret = NETDEV_TX_OK;
1938 1939 1940
		goto fail;
	}

1941 1942 1943 1944 1945
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
		tmp_skb = skb;
1946
		skb = skb_clone(skb, GFP_ATOMIC);
1947 1948 1949 1950 1951 1952 1953 1954
		kfree_skb(tmp_skb);

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

1955
	hdr.frame_control = fc;
1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
	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;
	}

1973 1974 1975
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

1976 1977 1978 1979
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

1980
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1981

1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
	/*
	 * 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.
	 */
1993

1994
	if (head_need > 0 || skb_cloned(skb)) {
1995 1996 1997 1998
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
		if (ieee80211_skb_resize(local, skb, head_need, true))
1999 2000 2001 2002 2003 2004 2005 2006
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2007

2008
#ifdef CONFIG_MAC80211_MESH
2009 2010 2011 2012 2013
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2014
#endif
2015

2016
	if (ieee80211_is_data_qos(fc)) {
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
		__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);

2029 2030 2031
	nh_pos += hdrlen;
	h_pos += hdrlen;

2032 2033
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2034 2035 2036 2037 2038 2039 2040 2041

	/* 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);

2042
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2043 2044
	memset(info, 0, sizeof(*info));

2045
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2046
	ieee80211_xmit(sdata, skb);
2047

2048
	return NETDEV_TX_OK;
2049 2050

 fail:
2051
	if (ret == NETDEV_TX_OK)
2052 2053 2054 2055 2056 2057
		dev_kfree_skb(skb);

	return ret;
}


2058 2059 2060 2061
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2062 2063
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2064
	int i;
2065

2066 2067
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2068 2069
}

2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
				     struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	struct ieee80211_hdr *hdr;
	int ret;
	bool result = true;

2080
	sdata = vif_to_sdata(info->control.vif);
2081 2082

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2083
		ieee80211_tx(sdata, skb, true);
2084 2085
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2086
		sta = sta_info_get(sdata, hdr->addr1);
2087

J
Johannes Berg 已提交
2088
		ret = __ieee80211_tx(local, &skb, sta, true);
2089 2090 2091 2092 2093 2094 2095
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

2096
/*
J
Johannes Berg 已提交
2097
 * Transmit all pending packets. Called from tasklet.
2098
 */
2099 2100 2101
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2102
	struct ieee80211_sub_if_data *sdata;
2103
	unsigned long flags;
2104
	int i;
J
Johannes Berg 已提交
2105
	bool txok;
2106

2107
	rcu_read_lock();
2108

J
Johannes Berg 已提交
2109
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2110 2111 2112 2113 2114
	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
2115
		if (local->queue_stop_reasons[i] ||
2116
		    skb_queue_empty(&local->pending[i]))
2117
			continue;
2118

2119
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2120
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2121 2122
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2123 2124 2125 2126 2127
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2128 2129 2130 2131 2132 2133 2134 2135 2136
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			if (!txok)
				__skb_queue_head(&local->pending[i], skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2137
				break;
2138
		}
2139 2140 2141

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2142
				netif_wake_subqueue(sdata->dev, i);
2143
	}
J
Johannes Berg 已提交
2144
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2145

2146
	rcu_read_unlock();
2147 2148 2149 2150
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2151
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2152 2153
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
{
	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)
2168
		bss->dtim_count = beacon->dtim_period - 1;
2169 2170 2171 2172 2173 2174 2175
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2176
	*pos++ = beacon->dtim_period;
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212

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

	if (have_bits) {
		/* Find largest even number N1 so that bits numbered 1 through
		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
		 * (N2 + 1) x 8 through 2007 are 0. */
		n1 = 0;
		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
			if (bss->tim[i]) {
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
			if (bss->tim[i]) {
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2213 2214 2215
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2216 2217
{
	struct ieee80211_local *local = hw_to_local(hw);
2218
	struct sk_buff *skb = NULL;
2219
	struct ieee80211_tx_info *info;
2220 2221
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2222
	struct beacon_data *beacon;
2223
	struct ieee80211_supported_band *sband;
2224
	enum ieee80211_band band = local->hw.conf.channel->band;
2225
	struct ieee80211_tx_rate_control txrc;
2226

2227
	sband = local->hw.wiphy->bands[band];
2228 2229

	rcu_read_lock();
2230

2231
	sdata = vif_to_sdata(vif);
2232

2233 2234 2235 2236 2237
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2238
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2239 2240
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
		if (ap && beacon) {
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
					    beacon->tail_len + 256);
			if (!skb)
				goto out;
2251

J
Johannes Berg 已提交
2252 2253 2254
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2255

2256 2257 2258 2259 2260 2261 2262 2263
			/*
			 * Not very nice, but we want to allow the driver to call
			 * ieee80211_beacon_get() as a response to the set_tim()
			 * callback. That, however, is already invoked under the
			 * sta_lock to guarantee consistent and race-free update
			 * of the tim bitmap in mac80211 and the driver.
			 */
			if (local->tim_in_locked_section) {
R
Rami Rosen 已提交
2264
				ieee80211_beacon_add_tim(ap, skb, beacon);
2265 2266 2267 2268
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2269
				ieee80211_beacon_add_tim(ap, skb, beacon);
2270 2271
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2272

2273 2274 2275 2276 2277
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2278 2279 2280
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2281 2282
		} else
			goto out;
2283
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2284
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2285
		struct ieee80211_hdr *hdr;
2286
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2287

2288
		if (!presp)
2289 2290
			goto out;

2291
		skb = skb_copy(presp, GFP_ATOMIC);
2292 2293 2294 2295
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2296 2297
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2298
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2299 2300 2301
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2302
		/* headroom, head length, tail length and maximum TIM length */
2303 2304
		skb = dev_alloc_skb(local->tx_headroom + 400 +
				sdata->u.mesh.vendor_ie_len);
J
Johannes Berg 已提交
2305 2306 2307 2308 2309 2310 2311
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
		mgmt = (struct ieee80211_mgmt *)
			skb_put(skb, 24 + sizeof(mgmt->u.beacon));
		memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2312 2313
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2314
		memset(mgmt->da, 0xff, ETH_ALEN);
2315 2316
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2317
		mgmt->u.beacon.beacon_int =
2318
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2319 2320 2321 2322 2323 2324
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2325
		mesh_mgmt_ies_add(skb, sdata);
2326 2327
	} else {
		WARN_ON(1);
2328
		goto out;
2329 2330
	}

2331 2332
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2333
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2334
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2335
	info->band = band;
2336 2337 2338 2339 2340 2341 2342

	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;
2343 2344 2345 2346 2347
	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;
2348
	txrc.bss = true;
2349
	rate_control_get_rate(sdata, NULL, &txrc);
2350 2351

	info->control.vif = vif;
2352

2353 2354 2355
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2356
 out:
2357
	rcu_read_unlock();
2358 2359
	return skb;
}
2360
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2361

2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_pspoll *pspoll;
	struct ieee80211_local *local;
	struct sk_buff *skb;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return NULL;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "pspoll template\n", sdata->name);
		return NULL;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					    IEEE80211_STYPE_PSPOLL);
	pspoll->aid = cpu_to_le16(ifmgd->aid);

	/* aid in PS-Poll has its two MSBs each set to 1 */
	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);

	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
	memcpy(pspoll->ta, vif->addr, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_pspoll_get);

struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif)
{
	struct ieee80211_hdr_3addr *nullfunc;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_local *local;
	struct sk_buff *skb;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return NULL;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
		       "template\n", sdata->name);
		return NULL;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
							  sizeof(*nullfunc));
	memset(nullfunc, 0, sizeof(*nullfunc));
	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					      IEEE80211_STYPE_NULLFUNC |
					      IEEE80211_FCTL_TODS);
	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_nullfunc_get);

2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
				       const u8 *ie, size_t ie_len)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	sdata = vif_to_sdata(vif);
	local = sdata->local;
	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
			    ie_ssid_len + ie_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request template\n", sdata->name);
		return NULL;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);

	hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
	memset(hdr, 0, sizeof(*hdr));
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					 IEEE80211_STYPE_PROBE_REQ);
	memset(hdr->addr1, 0xff, ETH_ALEN);
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
	memset(hdr->addr3, 0xff, ETH_ALEN);

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	if (ssid)
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	if (ie) {
		pos = skb_put(skb, ie_len);
		memcpy(pos, ie, ie_len);
	}

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2490
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2491
		       const void *frame, size_t frame_len,
2492
		       const struct ieee80211_tx_info *frame_txctl,
2493 2494 2495 2496
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2497 2498
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2499 2500
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2501 2502 2503 2504 2505
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2506
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2507
			     const void *frame, size_t frame_len,
2508
			     const struct ieee80211_tx_info *frame_txctl,
2509 2510 2511 2512
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2513 2514
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2515 2516
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2517 2518 2519 2520 2521
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2522
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2523
			  struct ieee80211_vif *vif)
2524 2525
{
	struct ieee80211_local *local = hw_to_local(hw);
2526
	struct sk_buff *skb = NULL;
2527
	struct sta_info *sta;
2528
	struct ieee80211_tx_data tx;
2529 2530
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2531
	struct beacon_data *beacon;
2532
	struct ieee80211_tx_info *info;
2533

2534
	sdata = vif_to_sdata(vif);
2535
	bss = &sdata->u.ap;
2536 2537 2538 2539

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

2540
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2541
		goto out;
2542

2543
	if (bss->dtim_count != 0)
2544
		goto out; /* send buffered bc/mc only after DTIM beacon */
2545

2546 2547 2548
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2549
			goto out;
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561
		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
2562
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2563 2564 2565
			break;
		dev_kfree_skb_any(skb);
	}
2566 2567 2568

	info = IEEE80211_SKB_CB(skb);

2569
	sta = tx.sta;
2570 2571
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2572
	info->band = tx.channel->band;
2573

2574
	if (invoke_tx_handlers(&tx))
2575
		skb = NULL;
2576
 out:
2577
	rcu_read_unlock();
2578 2579 2580 2581

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2582

2583
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2584 2585 2586 2587 2588
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2589 2590 2591
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2592 2593 2594 2595 2596 2597
	/*
	 * 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
2598
	ieee80211_xmit(sdata, skb);
2599
	local_bh_enable();
J
Johannes Berg 已提交
2600
}