tx.c 71.3 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

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

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

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 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 inline int is_ieee80211_device(struct ieee80211_local *local,
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				      struct net_device *dev)
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{
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	return local == wdev_priv(dev->ieee80211_ptr);
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}

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

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

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

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

	if (!local->ps_sdata)
		return TX_CONTINUE;

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

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

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

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

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
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		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
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		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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

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

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

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

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	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)))) {
556
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
557
		return TX_DROP;
558
	} else
559 560 561
		tx->key = NULL;

	if (tx->key) {
562 563
		bool skip_hw = false;

564
		tx->key->tx_rx_count++;
565
		/* TODO: add threshold stuff again */
566

567 568 569
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
570
			if (ieee80211_is_auth(hdr->frame_control))
571
				break;
572
		case WLAN_CIPHER_SUITE_TKIP:
573
			if (!ieee80211_is_data_present(hdr->frame_control))
574 575
				tx->key = NULL;
			break;
576
		case WLAN_CIPHER_SUITE_CCMP:
577 578 579 580
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
581 582 583 584
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
585
			break;
586
		case WLAN_CIPHER_SUITE_AES_CMAC:
587 588 589
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
590
		}
591

592 593 594
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

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		if (!skip_hw && tx->key &&
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596
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
597
			info->control.hw_key = &tx->key->conf;
598 599
	}

600
	return TX_CONTINUE;
601 602
}

603
static ieee80211_tx_result debug_noinline
604
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
605
{
606
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
607 608 609
	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
610 611
	int i;
	u32 len;
612 613
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
614
	u32 sta_flags;
615

616
	memset(&txrc, 0, sizeof(txrc));
617

618
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
619

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620
	len = min_t(u32, tx->skb->len + FCS_LEN,
621
			 tx->local->hw.wiphy->frag_threshold);
622 623 624 625 626 627 628

	/* 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;
629 630 631 632 633
	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;
634 635
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
636 637

	/* set up RTS protection if desired */
638
	if (len > tx->local->hw.wiphy->rts_threshold) {
639
		txrc.rts = rts = true;
640 641
	}

642 643 644 645 646 647 648 649 650 651
	/*
	 * 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;
652

653 654 655 656 657 658
	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.
	 */
659
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
660 661 662 663 664
		 (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",
665
		 tx->sdata->name, hdr->addr1,
666 667
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
668

669 670 671 672
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
673 674 675 676 677
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

678
	if (txrc.reported_rate.idx < 0) {
679
		txrc.reported_rate = info->control.rates[0];
680 681 682
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
683
		tx->sta->last_tx_rate = txrc.reported_rate;
684

685 686
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
687

688 689 690 691
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

692 693 694 695 696
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
697 698
	}

699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
	/*
	 * 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;
724 725
	}

726 727 728 729 730 731 732 733 734 735 736 737 738 739
	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;
		}
740

741 742 743 744 745 746 747 748
		/*
		 * 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;
		}
749

750 751 752 753
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
754

755
		/* RC is busted */
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756 757
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
758 759
			info->control.rates[i].idx = -1;
			continue;
760
		}
761

762 763 764 765 766 767 768 769 770 771 772 773 774
		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;
775 776
	}

777 778 779
	return TX_CONTINUE;
}

780 781 782 783 784 785 786 787 788
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;

789 790 791 792 793
	/*
	 * 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.
	 */
794
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
795 796
		return TX_CONTINUE;

797 798 799 800 801 802
	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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	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
808
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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809
		/* driver should assign sequence number */
810
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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811 812 813
		/* 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;
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
		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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839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
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;
}

884
static ieee80211_tx_result debug_noinline
885 886
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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887 888 889
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
890
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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891 892
	int hdrlen;
	int fragnum;
893 894 895 896

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

897 898
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
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899
	 * This scenario is handled in ieee80211_tx_prepare but extra
900
	 * caution taken here as fragmented ampdu may cause Tx stop.
901
	 */
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902
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
903 904
		return TX_DROP;

905
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
906

J
Johannes Berg 已提交
907
	/* internal error, why is TX_FRAGMENTED set? */
908
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
909
		return TX_DROP;
910

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911 912 913 914 915 916 917 918 919 920
	/*
	 * 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;
921

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922 923 924 925 926
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
927

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Johannes Berg 已提交
928 929
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
930

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Johannes Berg 已提交
931 932 933
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
934 935 936 937 938 939 940 941 942 943
			/*
			 * 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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944 945 946
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
947
		}
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948 949 950 951
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
952

953
	return TX_CONTINUE;
954 955
}

956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
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;
}

973
static ieee80211_tx_result debug_noinline
974 975
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
976 977
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

978 979 980
	if (!tx->key)
		return TX_CONTINUE;

981 982 983
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
984
		return ieee80211_crypto_wep_encrypt(tx);
985
	case WLAN_CIPHER_SUITE_TKIP:
986
		return ieee80211_crypto_tkip_encrypt(tx);
987
	case WLAN_CIPHER_SUITE_CCMP:
988
		return ieee80211_crypto_ccmp_encrypt(tx);
989
	case WLAN_CIPHER_SUITE_AES_CMAC:
990
		return ieee80211_crypto_aes_cmac_encrypt(tx);
991 992 993 994 995 996 997 998
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

999 1000 1001 1002 1003
	}

	return TX_DROP;
}

1004
static ieee80211_tx_result debug_noinline
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1005 1006
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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1007 1008 1009 1010
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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1011

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1012 1013
	do {
		hdr = (void *) skb->data;
1014 1015
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
J
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1016 1017
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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1018

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1019 1020 1021
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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1022 1023 1024 1025

	return TX_CONTINUE;
}

1026 1027 1028 1029 1030 1031
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
1032 1033
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
{
	/*
	 * 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;
1046
	bool hw_frag;
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1047
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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1048 1049
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1050

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1051
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1052
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1053

1054 1055 1056
	/* packet is fragmented in HW if we have a non-NULL driver callback */
	hw_frag = (tx->local->ops->set_frag_threshold != NULL);

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 1084 1085
	/*
	 * 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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1086
				if (skb->len < (iterator._max_length + FCS_LEN))
1087
					return false;
1088 1089 1090

				skb_trim(skb, skb->len - FCS_LEN);
			}
1091
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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1092
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1093 1094
			if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
								!hw_frag)
1095
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1096 1097
			break;

1098 1099 1100 1101 1102 1103
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1104 1105 1106 1107 1108 1109
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1110
		return false;
1111 1112 1113

	/*
	 * remove the radiotap header
J
Johannes Berg 已提交
1114
	 * iterator->_max_length was sanity-checked against
1115 1116
	 * skb->len by iterator init
	 */
J
Johannes Berg 已提交
1117
	skb_pull(skb, iterator._max_length);
1118

1119
	return true;
1120 1121
}

1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
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;
1132 1133 1134 1135 1136
	} 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
		 */
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1157
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174

		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;
}

1175 1176 1177
/*
 * initialises @tx
 */
1178
static ieee80211_tx_result
J
Johannes Berg 已提交
1179 1180 1181
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1182
{
J
Johannes Berg 已提交
1183
	struct ieee80211_local *local = sdata->local;
1184
	struct ieee80211_hdr *hdr;
1185
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
S
Sujith 已提交
1186
	int hdrlen, tid;
1187
	u8 *qc;
1188 1189 1190 1191

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1192
	tx->sdata = sdata;
1193
	tx->channel = local->hw.conf.channel;
1194
	/*
1195 1196
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1197
	 * Only valid when fragmentation is done by the stack.
1198
	 */
1199 1200
	if (!local->ops->set_frag_threshold)
		tx->flags |= IEEE80211_TX_FRAGMENTED;
1201 1202

	/* process and remove the injection radiotap header */
1203
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1204
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1205
			return TX_DROP;
1206

1207
		/*
1208 1209 1210
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1211
		 */
1212
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1213 1214
	}

1215 1216 1217 1218 1219 1220 1221
	/*
	 * 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;

1222 1223
	hdr = (struct ieee80211_hdr *) skb->data;

1224
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1225
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1226 1227
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1228 1229
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1230
	}
1231
	if (!tx->sta)
1232
		tx->sta = sta_info_get(sdata, hdr->addr1);
1233

1234 1235 1236 1237
	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
1238 1239 1240
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1241 1242 1243
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1244

1245 1246 1247 1248 1249 1250
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1251 1252
	}

1253
	if (is_multicast_ether_addr(hdr->addr1)) {
1254
		tx->flags &= ~IEEE80211_TX_UNICAST;
1255
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1256
	} else {
1257
		tx->flags |= IEEE80211_TX_UNICAST;
1258 1259 1260 1261
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1262
	}
1263

1264 1265
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1266
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1267
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1268
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1269
		else
1270
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1271 1272
	}

1273
	if (!tx->sta)
1274
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1275
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1276
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1277

1278
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1279 1280 1281 1282
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1283
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1284

1285
	return TX_CONTINUE;
1286 1287
}

1288 1289 1290 1291 1292
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp,
			   struct sta_info *sta, bool txpending)
1293
{
1294
	struct sk_buff *skb = *skbp, *next;
1295
	struct ieee80211_tx_info *info;
1296
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1297
	unsigned long flags;
1298
	int len;
J
Johannes Berg 已提交
1299
	bool fragm = false;
1300

J
Johannes Berg 已提交
1301
	while (skb) {
J
Johannes Berg 已提交
1302
		int q = skb_get_queue_mapping(skb);
1303
		__le16 fc;
J
Johannes Berg 已提交
1304 1305 1306

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
			/*
			 * Since queue is stopped, queue up frames for later
			 * transmission from the tx-pending tasklet when the
			 * queue is woken again.
			 */

			do {
				next = skb->next;
				skb->next = NULL;
				/*
				 * NB: If txpending is true, next must already
				 * be NULL since we must've gone through this
				 * loop before already; therefore we can just
				 * queue the frame to the head without worrying
				 * about reordering of fragments.
				 */
				if (unlikely(txpending))
					__skb_queue_head(&local->pending[q],
							 skb);
				else
					__skb_queue_tail(&local->pending[q],
							 skb);
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1336
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1337

1338 1339 1340
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1341
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1342
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1343

J
Johannes Berg 已提交
1344
		next = skb->next;
1345
		len = skb->len;
1346

J
Johannes Berg 已提交
1347 1348 1349
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
		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
1365 1366 1367 1368 1369
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1370
		fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1371
		drv_tx(local, skb);
1372

1373
		ieee80211_tpt_led_trig_tx(local, fc, len);
1374
		*skbp = skb = next;
J
Johannes Berg 已提交
1375 1376
		ieee80211_led_tx(local, 1);
		fragm = true;
1377
	}
J
Johannes Berg 已提交
1378

1379
	return true;
1380 1381
}

1382 1383 1384 1385 1386 1387 1388
/*
 * 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;
1389
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1390 1391
	ieee80211_tx_result res = TX_DROP;

1392 1393 1394 1395 1396 1397 1398
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1399
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1400 1401
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1402
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1403
	CALL_TXH(ieee80211_tx_h_select_key);
1404 1405
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1406 1407 1408 1409 1410

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1411 1412
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1413
	/* handlers after fragment must be aware of tx info fragmentation! */
1414 1415
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1416 1417
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1418
#undef CALL_TXH
1419

1420
 txh_done:
1421
	if (unlikely(res == TX_DROP)) {
1422
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1423 1424 1425 1426 1427 1428 1429
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1430 1431
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1432
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1433 1434 1435 1436 1437 1438
		return -1;
	}

	return 0;
}

1439 1440 1441 1442
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1443
			 struct sk_buff *skb, bool txpending)
1444
{
J
Johannes Berg 已提交
1445
	struct ieee80211_local *local = sdata->local;
1446
	struct ieee80211_tx_data tx;
1447
	ieee80211_tx_result res_prepare;
1448
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1449
	bool result = true;
1450 1451 1452

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1453
		return true;
1454 1455
	}

1456 1457
	rcu_read_lock();

1458
	/* initialises tx */
J
Johannes Berg 已提交
1459
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1460

1461
	if (unlikely(res_prepare == TX_DROP)) {
1462
		dev_kfree_skb(skb);
1463
		goto out;
1464
	} else if (unlikely(res_prepare == TX_QUEUED)) {
1465
		goto out;
1466 1467
	}

1468
	tx.channel = local->hw.conf.channel;
1469
	info->band = tx.channel->band;
1470

1471 1472
	if (!invoke_tx_handlers(&tx))
		result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1473
 out:
1474
	rcu_read_unlock();
1475
	return result;
1476 1477 1478 1479
}

/* device xmit handlers */

1480
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1481 1482 1483
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1484
	struct ieee80211_local *local = sdata->local;
1485 1486
	int tail_need = 0;

1487
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
		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);
	}

1498
	if (skb_cloned(skb))
1499
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1500
	else if (head_need || tail_need)
1501
		I802_DEBUG_INC(local->tx_expand_skb_head);
1502 1503
	else
		return 0;
1504 1505

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1506 1507
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1508 1509 1510 1511 1512 1513 1514 1515 1516
		return -ENOMEM;
	}

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

	return 0;
}

J
Johannes Berg 已提交
1517 1518
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1519
{
J
Johannes Berg 已提交
1520
	struct ieee80211_local *local = sdata->local;
1521
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1522
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1523
	struct ieee80211_sub_if_data *tmp_sdata;
1524
	int headroom;
1525
	bool may_encrypt;
1526

1527 1528
	rcu_read_lock();

1529
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1530 1531 1532
		int hdrlen;
		u16 len_rthdr;

1533 1534
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1535 1536

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1537
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
		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
1552
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1553
						list) {
1554
				if (!ieee80211_sdata_running(tmp_sdata))
1555
					continue;
1556 1557 1558 1559 1560 1561
				if (tmp_sdata->vif.type ==
				    NL80211_IFTYPE_MONITOR ||
				    tmp_sdata->vif.type ==
				    NL80211_IFTYPE_AP_VLAN ||
					tmp_sdata->vif.type ==
				    NL80211_IFTYPE_WDS)
1562
					continue;
1563
				if (compare_ether_addr(tmp_sdata->vif.addr,
1564
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1565
					sdata = tmp_sdata;
1566 1567 1568 1569
					break;
				}
			}
		}
1570 1571
	}

J
Johannes Berg 已提交
1572
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1573

J
Johannes Berg 已提交
1574
	headroom = local->tx_headroom;
1575 1576 1577 1578 1579
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1580
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1581
		dev_kfree_skb(skb);
1582
		rcu_read_unlock();
J
Johannes Berg 已提交
1583
		return;
1584 1585
	}

1586
	hdr = (struct ieee80211_hdr *) skb->data;
1587
	info->control.vif = &sdata->vif;
1588

1589 1590 1591 1592 1593
	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 */
1594
				rcu_read_unlock();
1595 1596 1597
				return;
			}

1598
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1599
	ieee80211_tx(sdata, skb, false);
1600
	rcu_read_unlock();
1601 1602
}

1603 1604
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1605 1606
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1607
	struct ieee80211_channel *chan = local->hw.conf.channel;
1608 1609
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1610
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1611
	struct ieee80211_hdr *hdr;
1612
	u16 len_rthdr;
1613
	u8 *payload;
1614

1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	/*
	 * 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;

1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
	/* 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 */
1649 1650 1651 1652 1653 1654 1655

	/*
	 * 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
	 */
1656
	skb_set_mac_header(skb, len_rthdr);
1657
	/*
1658 1659
	 * 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
1660
	 */
1661 1662
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1663

1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
	if (skb->len > len_rthdr + 2) {
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
		if (ieee80211_is_data(hdr->frame_control) &&
		    skb->len >= len_rthdr +
				ieee80211_hdrlen(hdr->frame_control) +
				sizeof(rfc1042_header) + 2) {
			payload = (u8 *)hdr +
				  ieee80211_hdrlen(hdr->frame_control);
			if (compare_ether_addr(payload, rfc1042_header) == 0)
				skb->protocol = cpu_to_be16((payload[6] << 8) |
							    payload[7]);
		}
	}

J
Johannes Berg 已提交
1682 1683
	memset(info, 0, sizeof(*info));

1684 1685
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1686 1687
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1688
	return NETDEV_TX_OK;
1689 1690 1691 1692

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
}

/**
 * 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).
 */
1710 1711
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1712
{
1713 1714
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1715
	struct ieee80211_tx_info *info;
1716
	int ret = NETDEV_TX_BUSY, head_need;
1717 1718
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1719
	struct ieee80211_hdr hdr;
1720
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1721
	struct mesh_path __maybe_unused *mppath = NULL;
1722 1723
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1724
	int nh_pos, h_pos;
1725
	struct sta_info *sta = NULL;
1726
	u32 sta_flags = 0;
1727
	struct sk_buff *tmp_skb;
1728 1729

	if (unlikely(skb->len < ETH_HLEN)) {
1730
		ret = NETDEV_TX_OK;
1731 1732 1733 1734 1735 1736
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1737
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1738

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

1786
		/*
1787 1788 1789 1790
		 * Use address extension if it is a packet from
		 * another interface or if we know the destination
		 * is being proxied by a portal (i.e. portal address
		 * differs from proxied address)
1791
		 */
1792
		if (compare_ether_addr(sdata->vif.addr,
1793
				       skb->data + ETH_ALEN) == 0 &&
1794
		    !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1795 1796
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
1797
			rcu_read_unlock();
1798
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1799
					sdata, NULL, NULL);
1800
		} else {
1801
			int is_mesh_mcast = 1;
1802
			const u8 *mesh_da;
1803 1804

			if (is_multicast_ether_addr(skb->data))
1805 1806
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1807
			else {
1808 1809
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1810 1811 1812 1813
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1814
				} else {
1815
					/* DA TA mSA AE:SA */
1816 1817
					mesh_da = bcast;
				}
1818
			}
1819
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1820
					mesh_da, sdata->vif.addr);
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
			rcu_read_unlock();
			if (is_mesh_mcast)
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL);
			else
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data,
							skb->data + ETH_ALEN);
1834 1835

		}
1836 1837
		break;
#endif
1838
	case NL80211_IFTYPE_STATION:
1839
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1840 1841
		if (sdata->u.mgd.use_4addr &&
		    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1842 1843
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1844
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
			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;
		}
1855
		break;
1856
	case NL80211_IFTYPE_ADHOC:
1857 1858 1859
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1860
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1861
		hdrlen = 24;
1862 1863
		break;
	default:
1864
		ret = NETDEV_TX_OK;
1865 1866 1867
		goto fail;
	}

1868 1869 1870 1871 1872 1873
	/*
	 * 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)) {
1874
		rcu_read_lock();
1875 1876
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1877
			sta_flags = get_sta_flags(sta);
1878
		rcu_read_unlock();
1879 1880
	}

1881
	/* receiver and we are QoS enabled, use a QoS type frame */
1882
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1883
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1884 1885 1886 1887
		hdrlen += 2;
	}

	/*
1888 1889
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1890
	 */
1891 1892
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1893
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
1894
		      !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1895
		       compare_ether_addr(sdata->vif.addr,
1896 1897 1898
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1899
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1900
			       " (unauthorized port)\n", dev->name,
1901
			       hdr.addr1);
1902 1903 1904 1905
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1906
		ret = NETDEV_TX_OK;
1907 1908 1909
		goto fail;
	}

1910 1911 1912 1913 1914
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
		tmp_skb = skb;
1915
		skb = skb_clone(skb, GFP_ATOMIC);
1916 1917 1918 1919 1920 1921 1922 1923
		kfree_skb(tmp_skb);

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

1924
	hdr.frame_control = fc;
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
	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;
	}

1942 1943 1944
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

1945 1946 1947 1948
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

1949
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1950

1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
	/*
	 * 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.
	 */
1962

1963
	if (head_need > 0 || skb_cloned(skb)) {
1964 1965 1966
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
1967
		if (ieee80211_skb_resize(sdata, skb, head_need, true))
1968 1969 1970 1971 1972 1973 1974 1975
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1976

1977
#ifdef CONFIG_MAC80211_MESH
1978 1979 1980 1981 1982
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
1983
#endif
1984

1985
	if (ieee80211_is_data_qos(fc)) {
1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
		__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);

1998 1999 2000
	nh_pos += hdrlen;
	h_pos += hdrlen;

2001 2002
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2003 2004 2005 2006 2007 2008 2009 2010

	/* 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);

2011
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2012 2013
	memset(info, 0, sizeof(*info));

2014
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2015
	ieee80211_xmit(sdata, skb);
2016

2017
	return NETDEV_TX_OK;
2018 2019

 fail:
2020
	if (ret == NETDEV_TX_OK)
2021 2022 2023 2024 2025 2026
		dev_kfree_skb(skb);

	return ret;
}


2027 2028 2029 2030
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2031 2032
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2033
	int i;
2034

2035 2036
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2037 2038
}

2039 2040 2041 2042 2043
/*
 * Returns false if the frame couldn't be transmitted but was queued instead,
 * which in this case means re-queued -- take as an indication to stop sending
 * more pending frames.
 */
2044 2045 2046 2047 2048 2049 2050
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;
2051
	bool result;
2052

2053
	sdata = vif_to_sdata(info->control.vif);
2054 2055

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2056
		result = ieee80211_tx(sdata, skb, true);
2057 2058
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2059
		sta = sta_info_get(sdata, hdr->addr1);
2060

2061
		result = __ieee80211_tx(local, &skb, sta, true);
2062 2063 2064 2065 2066
	}

	return result;
}

2067
/*
J
Johannes Berg 已提交
2068
 * Transmit all pending packets. Called from tasklet.
2069
 */
2070 2071 2072
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2073
	struct ieee80211_sub_if_data *sdata;
2074
	unsigned long flags;
2075
	int i;
J
Johannes Berg 已提交
2076
	bool txok;
2077

2078
	rcu_read_lock();
2079

J
Johannes Berg 已提交
2080
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2081 2082 2083 2084 2085
	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
2086
		if (local->queue_stop_reasons[i] ||
2087
		    skb_queue_empty(&local->pending[i]))
2088
			continue;
2089

2090
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2091
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2092 2093
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2094 2095 2096 2097 2098
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2099 2100 2101 2102 2103 2104 2105
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2106
				break;
2107
		}
2108 2109 2110

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2111
				netif_wake_subqueue(sdata->dev, i);
2112
	}
J
Johannes Berg 已提交
2113
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2114

2115
	rcu_read_unlock();
2116 2117 2118 2119
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2120
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2121 2122
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
{
	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)
2137
		bss->dtim_count = beacon->dtim_period - 1;
2138 2139 2140 2141 2142 2143 2144
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2145
	*pos++ = beacon->dtim_period;
2146 2147 2148 2149

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

2150 2151
	bss->dtim_bc_mc = aid0 == 1;

2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183
	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 */
	}
}

2184 2185 2186
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2187 2188
{
	struct ieee80211_local *local = hw_to_local(hw);
2189
	struct sk_buff *skb = NULL;
2190
	struct ieee80211_tx_info *info;
2191 2192
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2193
	struct beacon_data *beacon;
2194
	struct ieee80211_supported_band *sband;
2195
	enum ieee80211_band band = local->hw.conf.channel->band;
2196
	struct ieee80211_tx_rate_control txrc;
2197

2198
	sband = local->hw.wiphy->bands[band];
2199 2200

	rcu_read_lock();
2201

2202
	sdata = vif_to_sdata(vif);
2203

2204 2205 2206
	if (!ieee80211_sdata_running(sdata))
		goto out;

2207 2208 2209 2210 2211
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2212
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2213 2214
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2215
		if (beacon) {
J
Johannes Berg 已提交
2216 2217 2218 2219 2220 2221 2222 2223 2224
			/*
			 * 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;
2225

J
Johannes Berg 已提交
2226 2227 2228
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2229

2230 2231 2232 2233 2234 2235 2236 2237
			/*
			 * 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
2238
				ieee80211_beacon_add_tim(ap, skb, beacon);
2239 2240 2241 2242
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2243
				ieee80211_beacon_add_tim(ap, skb, beacon);
2244 2245
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2246

2247 2248 2249 2250 2251
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2252 2253 2254
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2255 2256
		} else
			goto out;
2257
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2258
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2259
		struct ieee80211_hdr *hdr;
2260
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2261

2262
		if (!presp)
2263 2264
			goto out;

2265
		skb = skb_copy(presp, GFP_ATOMIC);
2266 2267 2268 2269
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2270 2271
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2272
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2273 2274 2275
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

2276 2277 2278 2279 2280
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

J
Johannes Berg 已提交
2281
		/* headroom, head length, tail length and maximum TIM length */
2282
		skb = dev_alloc_skb(local->tx_headroom + 400 +
2283
				sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2284 2285 2286 2287 2288 2289 2290
		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));
2291 2292
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2293
		memset(mgmt->da, 0xff, ETH_ALEN);
2294 2295
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2296
		mgmt->u.beacon.beacon_int =
2297
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2298 2299
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2300 2301 2302 2303 2304

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

2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
		if (mesh_add_srates_ie(skb, sdata) ||
		    mesh_add_ds_params_ie(skb, sdata) ||
		    mesh_add_ext_srates_ie(skb, sdata) ||
		    mesh_add_rsn_ie(skb, sdata) ||
		    mesh_add_meshid_ie(skb, sdata) ||
		    mesh_add_meshconf_ie(skb, sdata) ||
		    mesh_add_vendor_ies(skb, sdata)) {
			pr_err("o11s: couldn't add ies!\n");
			goto out;
		}
2315 2316
	} else {
		WARN_ON(1);
2317
		goto out;
2318 2319
	}

2320 2321
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2322
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2323
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2324
	info->band = band;
2325 2326 2327 2328 2329 2330 2331

	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;
2332 2333 2334 2335 2336
	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;
2337
	txrc.bss = true;
2338
	rate_control_get_rate(sdata, NULL, &txrc);
2339 2340

	info->control.vif = vif;
2341

2342 2343 2344
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2345
 out:
2346
	rcu_read_unlock();
2347 2348
	return skb;
}
2349
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2350

2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
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));
2368
	if (!skb)
2369
		return NULL;
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
	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));
2406
	if (!skb)
2407
		return NULL;
2408

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424
	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);

2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
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);
2443
	if (!skb)
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
		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);

2472
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2473
		       const void *frame, size_t frame_len,
2474
		       const struct ieee80211_tx_info *frame_txctl,
2475 2476 2477 2478
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2479 2480
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2481 2482
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2483 2484 2485 2486 2487
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2488
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2489
			     const void *frame, size_t frame_len,
2490
			     const struct ieee80211_tx_info *frame_txctl,
2491 2492 2493 2494
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2495 2496
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2497 2498
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2499 2500 2501 2502 2503
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2504
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2505
			  struct ieee80211_vif *vif)
2506 2507
{
	struct ieee80211_local *local = hw_to_local(hw);
2508
	struct sk_buff *skb = NULL;
2509
	struct ieee80211_tx_data tx;
2510 2511
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2512
	struct beacon_data *beacon;
2513
	struct ieee80211_tx_info *info;
2514

2515
	sdata = vif_to_sdata(vif);
2516
	bss = &sdata->u.ap;
2517 2518 2519 2520

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

2521
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2522
		goto out;
2523

2524
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2525
		goto out; /* send buffered bc/mc only after DTIM beacon */
2526

2527 2528 2529
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2530
			goto out;
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
		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
2543
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2544 2545 2546
			break;
		dev_kfree_skb_any(skb);
	}
2547 2548 2549

	info = IEEE80211_SKB_CB(skb);

2550 2551
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2552
	info->band = tx.channel->band;
2553

2554
	if (invoke_tx_handlers(&tx))
2555
		skb = NULL;
2556
 out:
2557
	rcu_read_unlock();
2558 2559 2560 2561

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2562

2563
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2564 2565 2566 2567 2568
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2569 2570 2571
	/* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
	skb_set_queue_mapping(skb, IEEE80211_AC_VO);
	skb->priority = 7;
2572

2573 2574 2575 2576 2577 2578
	/*
	 * 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
2579
	ieee80211_xmit(sdata, skb);
2580
	local_bh_enable();
J
Johannes Berg 已提交
2581
}