tx.c 70.8 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 1300 1301 1302 1303 1304 1305 1306 1307 1308
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		ret = IEEE80211_TX_OK;
		if (local->queue_stop_reasons[q] ||
		    (!txpending && !skb_queue_empty(&local->pending[q])))
			ret = IEEE80211_TX_PENDING;
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
		if (ret != IEEE80211_TX_OK)
			return ret;
1309

1310 1311 1312
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1313
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1314
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1315

J
Johannes Berg 已提交
1316
		next = skb->next;
1317
		len = skb->len;
1318

J
Johannes Berg 已提交
1319 1320 1321
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
		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
1337 1338 1339 1340 1341
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1342
		ret = drv_tx(local, skb);
1343 1344 1345 1346
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1347 1348
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1349
			return IEEE80211_TX_AGAIN;
1350 1351
		}

1352
		*skbp = skb = next;
J
Johannes Berg 已提交
1353 1354
		ieee80211_led_tx(local, 1);
		fragm = true;
1355
	}
J
Johannes Berg 已提交
1356

1357 1358 1359
	return IEEE80211_TX_OK;
}

1360 1361 1362 1363 1364 1365 1366
/*
 * 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;
1367
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1368 1369
	ieee80211_tx_result res = TX_DROP;

1370 1371 1372 1373 1374 1375 1376
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1377
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1378 1379
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1380
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1381
	CALL_TXH(ieee80211_tx_h_select_key);
1382 1383
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1384 1385 1386 1387 1388

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1389 1390
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1391
	/* handlers after fragment must be aware of tx info fragmentation! */
1392 1393 1394
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1395
#undef CALL_TXH
1396

1397
 txh_done:
1398
	if (unlikely(res == TX_DROP)) {
1399
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1400 1401 1402 1403 1404 1405 1406
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1407 1408
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1409
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1410 1411 1412 1413 1414 1415
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1416 1417
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1418
{
J
Johannes Berg 已提交
1419
	struct ieee80211_local *local = sdata->local;
1420
	struct ieee80211_tx_data tx;
1421
	ieee80211_tx_result res_prepare;
1422
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1423 1424 1425
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1426
	u16 queue;
1427

1428 1429
	queue = skb_get_queue_mapping(skb);

1430 1431
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1432
		return;
1433 1434
	}

1435 1436
	rcu_read_lock();

1437
	/* initialises tx */
J
Johannes Berg 已提交
1438
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1439

1440
	if (unlikely(res_prepare == TX_DROP)) {
1441
		dev_kfree_skb(skb);
1442
		rcu_read_unlock();
1443 1444 1445 1446
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1447 1448
	}

1449
	tx.channel = local->hw.conf.channel;
1450
	info->band = tx.channel->band;
1451

1452 1453
	if (invoke_tx_handlers(&tx))
		goto out;
1454

1455 1456
	retries = 0;
 retry:
J
Johannes Berg 已提交
1457
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1458 1459 1460 1461
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1462 1463 1464 1465 1466
		/*
		 * 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.
		 */
1467 1468 1469 1470 1471
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1472

1473
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1474

J
Johannes Berg 已提交
1475 1476 1477 1478 1479 1480
		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
			 */
1481 1482 1483
			do {
				next = skb->next;
				skb->next = NULL;
1484
				if (unlikely(txpending))
J
Johannes Berg 已提交
1485 1486
					__skb_queue_head(&local->pending[queue],
							 skb);
1487
				else
J
Johannes Berg 已提交
1488 1489
					__skb_queue_tail(&local->pending[queue],
							 skb);
1490 1491 1492 1493 1494
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1495 1496 1497 1498
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1499 1500 1501 1502
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1503
			if (WARN(retries > 10, "tx refused but queue active\n"))
1504
				goto drop;
1505 1506 1507
			goto retry;
		}
	}
1508
 out:
1509
	rcu_read_unlock();
1510
	return;
1511 1512

 drop:
1513
	rcu_read_unlock();
J
Johannes Berg 已提交
1514 1515 1516 1517 1518 1519 1520

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1521 1522 1523 1524
}

/* device xmit handlers */

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
static int ieee80211_skb_resize(struct ieee80211_local *local,
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
	int tail_need = 0;

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

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

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

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1553 1554
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1555 1556 1557 1558 1559 1560 1561 1562 1563
		return -ENOMEM;
	}

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

	return 0;
}

J
Johannes Berg 已提交
1564 1565
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1566
{
J
Johannes Berg 已提交
1567
	struct ieee80211_local *local = sdata->local;
1568
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1569
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1570
	struct ieee80211_sub_if_data *tmp_sdata;
1571
	int headroom;
1572
	bool may_encrypt;
1573

1574 1575
	rcu_read_lock();

1576
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1577 1578 1579
		int hdrlen;
		u16 len_rthdr;

1580 1581
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1582 1583

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1584
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
		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
1599
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1600
						list) {
1601
				if (!ieee80211_sdata_running(tmp_sdata))
1602
					continue;
1603 1604 1605 1606 1607 1608
				if (tmp_sdata->vif.type ==
				    NL80211_IFTYPE_MONITOR ||
				    tmp_sdata->vif.type ==
				    NL80211_IFTYPE_AP_VLAN ||
					tmp_sdata->vif.type ==
				    NL80211_IFTYPE_WDS)
1609
					continue;
1610
				if (compare_ether_addr(tmp_sdata->vif.addr,
1611
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1612
					sdata = tmp_sdata;
1613 1614 1615 1616
					break;
				}
			}
		}
1617 1618
	}

J
Johannes Berg 已提交
1619
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1620

J
Johannes Berg 已提交
1621
	headroom = local->tx_headroom;
1622 1623 1624 1625 1626
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1627
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1628
		dev_kfree_skb(skb);
1629
		rcu_read_unlock();
J
Johannes Berg 已提交
1630
		return;
1631 1632
	}

1633
	hdr = (struct ieee80211_hdr *) skb->data;
1634
	info->control.vif = &sdata->vif;
1635

1636 1637 1638 1639 1640
	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 */
1641
				rcu_read_unlock();
1642 1643 1644
				return;
			}

1645
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1646
	ieee80211_tx(sdata, skb, false);
1647
	rcu_read_unlock();
1648 1649
}

1650 1651
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1652 1653
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1654
	struct ieee80211_channel *chan = local->hw.conf.channel;
1655 1656
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1657
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1658
	u16 len_rthdr;
1659

1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
	/*
	 * 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;

1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
	/* 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 */
1694 1695 1696 1697 1698 1699 1700

	/*
	 * 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
	 */
1701
	skb_set_mac_header(skb, len_rthdr);
1702
	/*
1703 1704
	 * 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
1705
	 */
1706 1707
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1708

J
Johannes Berg 已提交
1709 1710
	memset(info, 0, sizeof(*info));

1711 1712
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1713 1714
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1715
	return NETDEV_TX_OK;
1716 1717 1718 1719

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
}

/**
 * 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).
 */
1737 1738
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1739
{
1740 1741
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1742
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1743
	int ret = NETDEV_TX_BUSY, head_need;
1744 1745
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1746
	struct ieee80211_hdr hdr;
1747
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1748 1749
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1750
	int nh_pos, h_pos;
1751
	struct sta_info *sta = NULL;
1752
	u32 sta_flags = 0;
1753
	struct sk_buff *tmp_skb;
1754 1755

	if (unlikely(skb->len < ETH_HLEN)) {
1756
		ret = NETDEV_TX_OK;
1757 1758 1759 1760 1761 1762
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1763
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1764

1765
	switch (sdata->vif.type) {
1766
	case NL80211_IFTYPE_AP_VLAN:
1767
		rcu_read_lock();
1768
		sta = rcu_dereference(sdata->u.vlan.sta);
1769 1770 1771 1772
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1773
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
			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:
1784
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1785 1786
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1787
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1788 1789
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1790
		break;
1791
	case NL80211_IFTYPE_WDS:
1792
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1793 1794
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1795
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1796 1797 1798
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1799
		break;
1800
#ifdef CONFIG_MAC80211_MESH
1801
	case NL80211_IFTYPE_MESH_POINT:
1802
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1803
			/* Do not send frames with mesh_ttl == 0 */
1804
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1805
			ret = NETDEV_TX_OK;
1806
			goto fail;
1807
		}
1808

1809 1810
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1811 1812 1813
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1814
					sdata, NULL, NULL);
1815 1816 1817
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1818
			int is_mesh_mcast = 1;
1819
			const u8 *mesh_da;
1820

1821
			rcu_read_lock();
1822
			if (is_multicast_ether_addr(skb->data))
1823 1824
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1825
			else {
1826 1827 1828
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1829
				mppath = mpp_path_lookup(skb->data, sdata);
1830 1831 1832 1833
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1834
				} else {
1835
					/* DA TA mSA AE:SA */
1836 1837
					mesh_da = bcast;
				}
1838
			}
1839
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1840
					mesh_da, sdata->vif.addr);
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
			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);
1854 1855

		}
1856 1857
		break;
#endif
1858
	case NL80211_IFTYPE_STATION:
1859
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1860 1861
		if (sdata->u.mgd.use_4addr &&
		    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1862 1863
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1864
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
			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;
		}
1875
		break;
1876
	case NL80211_IFTYPE_ADHOC:
1877 1878 1879
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1880
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1881
		hdrlen = 24;
1882 1883
		break;
	default:
1884
		ret = NETDEV_TX_OK;
1885 1886 1887
		goto fail;
	}

1888 1889 1890 1891 1892 1893
	/*
	 * 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)) {
1894
		rcu_read_lock();
1895 1896
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1897
			sta_flags = get_sta_flags(sta);
1898
		rcu_read_unlock();
1899 1900
	}

1901
	/* receiver and we are QoS enabled, use a QoS type frame */
1902
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1903
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1904 1905 1906 1907
		hdrlen += 2;
	}

	/*
1908 1909
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1910
	 */
1911 1912
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1913
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
1914
		      !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1915
		       compare_ether_addr(sdata->vif.addr,
1916 1917 1918
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1919
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1920
			       " (unauthorized port)\n", dev->name,
1921
			       hdr.addr1);
1922 1923 1924 1925
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1926
		ret = NETDEV_TX_OK;
1927 1928 1929
		goto fail;
	}

1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
		tmp_skb = skb;
		skb = skb_copy(skb, GFP_ATOMIC);
		kfree_skb(tmp_skb);

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

1944
	hdr.frame_control = fc;
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
	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;
	}

1962 1963 1964
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

1965 1966 1967 1968
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

1969
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1970

1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
	/*
	 * 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.
	 */
1982

1983
	if (head_need > 0 || skb_cloned(skb)) {
1984 1985 1986 1987
		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))
1988 1989 1990 1991 1992 1993 1994 1995
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1996

1997
#ifdef CONFIG_MAC80211_MESH
1998 1999 2000 2001 2002
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2003
#endif
2004

2005
	if (ieee80211_is_data_qos(fc)) {
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
		__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);

2018 2019 2020
	nh_pos += hdrlen;
	h_pos += hdrlen;

2021 2022
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2023 2024 2025 2026 2027 2028 2029 2030

	/* Update skb pointers to various headers since this modified frame
	 * is going to go through Linux networking code that may potentially
	 * need things like pointer to IP header. */
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, nh_pos);
	skb_set_transport_header(skb, h_pos);

J
Johannes Berg 已提交
2031 2032
	memset(info, 0, sizeof(*info));

2033
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2034
	ieee80211_xmit(sdata, skb);
2035

2036
	return NETDEV_TX_OK;
2037 2038

 fail:
2039
	if (ret == NETDEV_TX_OK)
2040 2041 2042 2043 2044 2045
		dev_kfree_skb(skb);

	return ret;
}


2046 2047 2048 2049
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2050 2051
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2052
	int i;
2053

2054 2055
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2056 2057
}

2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
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;

2068
	sdata = vif_to_sdata(info->control.vif);
2069 2070

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2071
		ieee80211_tx(sdata, skb, true);
2072 2073
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2074
		sta = sta_info_get(sdata, hdr->addr1);
2075

J
Johannes Berg 已提交
2076
		ret = __ieee80211_tx(local, &skb, sta, true);
2077 2078 2079 2080 2081 2082 2083
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

2084
/*
J
Johannes Berg 已提交
2085
 * Transmit all pending packets. Called from tasklet.
2086
 */
2087 2088 2089
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2090
	struct ieee80211_sub_if_data *sdata;
2091
	unsigned long flags;
2092
	int i;
J
Johannes Berg 已提交
2093
	bool txok;
2094

2095
	rcu_read_lock();
2096

J
Johannes Berg 已提交
2097
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2098 2099 2100 2101 2102
	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
2103
		if (local->queue_stop_reasons[i] ||
2104
		    skb_queue_empty(&local->pending[i]))
2105
			continue;
2106

2107
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2108
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2109 2110
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2111 2112 2113 2114 2115
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2116 2117 2118 2119 2120 2121 2122 2123 2124
			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)
2125
				break;
2126
		}
2127 2128 2129

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2130
				netif_wake_subqueue(sdata->dev, i);
2131
	}
J
Johannes Berg 已提交
2132
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2133

2134
	rcu_read_unlock();
2135 2136 2137 2138
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2139
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2140 2141
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
{
	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)
2156
		bss->dtim_count = beacon->dtim_period - 1;
2157 2158 2159 2160 2161 2162 2163
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2164
	*pos++ = beacon->dtim_period;
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200

	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 */
	}
}

2201 2202 2203
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2204 2205
{
	struct ieee80211_local *local = hw_to_local(hw);
2206
	struct sk_buff *skb = NULL;
2207
	struct ieee80211_tx_info *info;
2208 2209
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2210
	struct beacon_data *beacon;
2211
	struct ieee80211_supported_band *sband;
2212
	enum ieee80211_band band = local->hw.conf.channel->band;
2213
	struct ieee80211_tx_rate_control txrc;
2214

2215
	sband = local->hw.wiphy->bands[band];
2216 2217

	rcu_read_lock();
2218

2219
	sdata = vif_to_sdata(vif);
2220

2221 2222 2223 2224 2225
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2226
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2227 2228
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2229 2230 2231 2232 2233 2234 2235 2236 2237 2238
		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;
2239

J
Johannes Berg 已提交
2240 2241 2242
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2243

2244 2245 2246 2247 2248 2249 2250 2251
			/*
			 * 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
2252
				ieee80211_beacon_add_tim(ap, skb, beacon);
2253 2254 2255 2256
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2257
				ieee80211_beacon_add_tim(ap, skb, beacon);
2258 2259
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2260

2261 2262 2263 2264 2265
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2266 2267 2268
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2269 2270
		} else
			goto out;
2271
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2272
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2273
		struct ieee80211_hdr *hdr;
2274
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2275

2276
		if (!presp)
2277 2278
			goto out;

2279
		skb = skb_copy(presp, GFP_ATOMIC);
2280 2281 2282 2283
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2284 2285
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2286
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2287 2288 2289
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2290
		/* headroom, head length, tail length and maximum TIM length */
2291 2292
		skb = dev_alloc_skb(local->tx_headroom + 400 +
				sdata->u.mesh.vendor_ie_len);
J
Johannes Berg 已提交
2293 2294 2295 2296 2297 2298 2299
		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));
2300 2301
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2302
		memset(mgmt->da, 0xff, ETH_ALEN);
2303 2304
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2305
		mgmt->u.beacon.beacon_int =
2306
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2307 2308 2309 2310 2311 2312
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2313
		mesh_mgmt_ies_add(skb, sdata);
2314 2315
	} else {
		WARN_ON(1);
2316
		goto out;
2317 2318
	}

2319 2320
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2321
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2322
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2323
	info->band = band;
2324 2325 2326 2327 2328 2329 2330

	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;
2331 2332 2333 2334 2335
	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;
2336
	txrc.bss = true;
2337
	rate_control_get_rate(sdata, NULL, &txrc);
2338 2339

	info->control.vif = vif;
2340

2341 2342 2343
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2344
 out:
2345
	rcu_read_unlock();
2346 2347
	return skb;
}
2348
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2349

2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 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
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);

2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 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
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);

2478
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2479
		       const void *frame, size_t frame_len,
2480
		       const struct ieee80211_tx_info *frame_txctl,
2481 2482 2483 2484
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2485 2486
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2487 2488
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2489 2490 2491 2492 2493
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2494
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2495
			     const void *frame, size_t frame_len,
2496
			     const struct ieee80211_tx_info *frame_txctl,
2497 2498 2499 2500
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2501 2502
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2503 2504
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2505 2506 2507 2508 2509
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2510
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2511
			  struct ieee80211_vif *vif)
2512 2513
{
	struct ieee80211_local *local = hw_to_local(hw);
2514
	struct sk_buff *skb = NULL;
2515
	struct sta_info *sta;
2516
	struct ieee80211_tx_data tx;
2517 2518
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2519
	struct beacon_data *beacon;
2520
	struct ieee80211_tx_info *info;
2521

2522
	sdata = vif_to_sdata(vif);
2523
	bss = &sdata->u.ap;
2524 2525 2526 2527

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

2528
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2529
		goto out;
2530

2531
	if (bss->dtim_count != 0)
2532
		goto out; /* send buffered bc/mc only after DTIM beacon */
2533

2534 2535 2536
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2537
			goto out;
2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549
		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
2550
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2551 2552 2553
			break;
		dev_kfree_skb_any(skb);
	}
2554 2555 2556

	info = IEEE80211_SKB_CB(skb);

2557
	sta = tx.sta;
2558 2559
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2560
	info->band = tx.channel->band;
2561

2562
	if (invoke_tx_handlers(&tx))
2563
		skb = NULL;
2564
 out:
2565
	rcu_read_unlock();
2566 2567 2568 2569

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2570

2571
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2572 2573 2574 2575 2576
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2577 2578 2579
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2580 2581 2582 2583 2584 2585
	/*
	 * 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
2586
	ieee80211_xmit(sdata, skb);
2587
	local_bh_enable();
J
Johannes Berg 已提交
2588
}