Release 4.11 net/mac80211/tx.c

/*
 * 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>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 *
 * 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/if_vlan.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <net/codel.h>
#include <net/codel_impl.h>
#include <asm/unaligned.h>
#include <net/fq_impl.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "led.h"
#include "mesh.h"
#include "wep.h"
#include "wpa.h"
#include "wme.h"
#include "rate.h"

/* misc utils */



static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
{
	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

	u64_stats_update_begin(&tstats->syncp);
	tstats->tx_packets++;
	tstats->tx_bytes += len;
	u64_stats_update_end(&tstats->syncp);
}

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
				 int next_frag_len)
{
	int rate, mrate, erp, dur, i, shift = 0;
	struct ieee80211_rate *txrate;
	struct ieee80211_local *local = tx->local;
	struct ieee80211_supported_band *sband;
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_chanctx_conf *chanctx_conf;
	u32 rate_flags = 0;

	/* assume HW handles this */
	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
		return 0;

	rcu_read_lock();
	chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
	if (chanctx_conf) {
		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
	}
	rcu_read_unlock();

	/* uh huh? */
	if (WARN_ON_ONCE(tx->rate.idx < 0))
		return 0;

	sband = local->hw.wiphy->bands[info->band];
	txrate = &sband->bitrates[tx->rate.idx];

	erp = txrate->flags & IEEE80211_RATE_ERP_G;

	/*
         * 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
         */
	hdr = (struct ieee80211_hdr *)skb->data;
	if (ieee80211_is_ctl(hdr->frame_control)) {
		/* TODO: These control frames are not currently sent by
                 * mac80211, but should they be implemented, this function
                 * 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 */)
		return cpu_to_le16(32768);

	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;
	/* 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];

		if (r->bitrate > txrate->bitrate)
			break;

		if ((rate_flags & r->flags) != rate_flags)
			continue;

		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);

		switch (sband->band) {
		case NL80211_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 NL80211_BAND_5GHZ:
			if (r->flags & IEEE80211_RATE_MANDATORY_A)
				mrate = r->bitrate;
			break;
		case NL80211_BAND_60GHZ:
			/* TODO, for now fall through */
		case NUM_NL80211_BANDS:
			WARN_ON(1);
			break;
		}
	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
                 * PHY rate */
		rate = DIV_ROUND_UP(mrate, 1 << shift);
	}

	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
		dur = 0;
	else
		/* Time needed to transmit ACK
                 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
                 * to closest integer */
		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
				tx->sdata->vif.bss_conf.use_short_preamble,
				shift);

	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(sband->band, next_frag_len,
				txrate->bitrate, erp,
				tx->sdata->vif.bss_conf.use_short_preamble,
				shift);
	}

	return cpu_to_le16(dur);
}

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/* tx handlers */

static ieee80211_tx_result debug_noinline

ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
	struct ieee80211_if_managed *ifmgd;

	/* driver doesn't support power save */
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
		return TX_CONTINUE;

	/* hardware does dynamic power save */
	if (ieee80211_hw_check(&local->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;

	/* 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: ifmgd->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) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
		return TX_CONTINUE;

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_MAX_QUEUE_MAP,
						IEEE80211_QUEUE_STOP_REASON_PS,
						false);
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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

	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

ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
{

	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	bool assoc = false;

	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
		return TX_CONTINUE;

	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
	    !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
                 */
		return TX_DROP;

	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
		return TX_CONTINUE;

	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
		return TX_CONTINUE;

	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);

	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
		if (unlikely(!assoc &&
			     ieee80211_is_data(hdr->frame_control))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			sdata_info(tx->sdata,
				   "dropped data frame to not associated station %pM\n",
				   hdr->addr1);
#endif
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
			return TX_DROP;
		}
	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
		/*
                 * No associated STAs - no need to send multicast
                 * frames.
                 */
		return TX_DROP;
	}

	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;

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		struct ps_data *ps;

		if (sdata->vif.type == NL80211_IFTYPE_AP)
			ps = &sdata->u.ap.ps;
		else if (ieee80211_vif_is_mesh(&sdata->vif))
			ps = &sdata->u.mesh.ps;
		else
			continue;

		skb = skb_dequeue(&ps->bc_buf);
		if (skb) {
			purged++;
			ieee80211_free_txskb(&local->hw, skb);
		}
		total += skb_queue_len(&ps->bc_buf);
	}

	/*
         * Drop one frame from each station from the lowest-priority
         * AC that has frames at all.
         */
	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		int ac;

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
				ieee80211_free_txskb(&local->hw, skb);
				break;
			}
		}
	}

	local->total_ps_buffered = total;
	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
}

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static ieee80211_tx_result

ieee80211_tx_h_multicast_ps_buf(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;
	struct ps_data *ps;

	/*
         * broadcast/multicast frame
         *
         * If any of the associated/peer 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.
         */

	/* powersaving STAs currently only in AP/VLAN/mesh mode */
	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
		if (!tx->sdata->bss)
			return TX_CONTINUE;

		ps = &tx->sdata->bss->ps;
	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
		ps = &tx->sdata->u.mesh.ps;
	} else {
		return TX_CONTINUE;
	}


	/* no buffering for ordered frames */
	if (ieee80211_has_order(hdr->frame_control))
		return TX_CONTINUE;

	if (ieee80211_is_probe_req(hdr->frame_control))
		return TX_CONTINUE;

	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
		info->hw_queue = tx->sdata->vif.cab_queue;

	/* no stations in PS mode */
	if (!atomic_read(&ps->num_sta_ps))
		return TX_CONTINUE;

	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;

	/* device releases frame after DTIM beacon */
	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
		return TX_CONTINUE;

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

	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
		ps_dbg(tx->sdata,
		       "BC TX buffer full - dropping the oldest frame\n");
		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
	} else
		tx->local->total_ps_buffered++;

	skb_queue_tail(&ps->bc_buf, tx->skb);

	return TX_QUEUED;
}

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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_flag(sta, WLAN_STA_MFP))
		return 0;

	if (!ieee80211_is_robust_mgmt_frame(skb))
		return 0;

	return 1;
}

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static ieee80211_tx_result

ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
{
	struct sta_info *sta = tx->sta;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_local *local = tx->local;

	if (unlikely(!sta))
		return TX_CONTINUE;

	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
		int ac = skb_get_queue_mapping(tx->skb);

		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
			return TX_CONTINUE;
		}

		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);

		/* sync with ieee80211_sta_ps_deliver_wakeup */
		spin_lock(&sta->ps_lock);
		/*
                 * STA woke up the meantime and all the frames on ps_tx_buf have
                 * been queued to pending queue. No reordering can happen, go
                 * ahead and Tx the packet.
                 */
		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
			spin_unlock(&sta->ps_lock);
			return TX_CONTINUE;
		}

		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
			ps_dbg(tx->sdata,
			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
			       sta->sta.addr, ac);
			ieee80211_free_txskb(&local->hw, old);
		} else
			tx->local->total_ps_buffered++;

		info->control.jiffies = jiffies;
		info->control.vif = &tx->sdata->vif;
		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
		spin_unlock(&sta->ps_lock);

		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

		/*
                 * We queued up some frames, so the TIM bit might
                 * need to be set, recalculate it.
                 */
		sta_info_recalc_tim(sta);

		return TX_QUEUED;
	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
		ps_dbg(tx->sdata,
		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
		       sta->sta.addr);
	}

	return TX_CONTINUE;
}

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100.00%


static ieee80211_tx_result debug_noinline

ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
{
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
		return TX_CONTINUE;

	if (tx->flags & IEEE80211_TX_UNICAST)
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
41
87.23%
4
66.67%
Jiri Slaby
4
8.51%
1
16.67%
Felix Fietkau
2
4.26%
1
16.67%
Total
47
100.00%
6
100.00%


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)) {
		if (tx->sdata->control_port_no_encrypt)
			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
	}

	return TX_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
68
91.89%
5
83.33%
Jouni Malinen
6
8.11%
1
16.67%
Total
74
100.00%
6
100.00%


static ieee80211_tx_result debug_noinline

ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
{
	struct ieee80211_key *key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;

	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
		tx->key = NULL;
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
		tx->key = key;
	else if (ieee80211_is_group_privacy_action(tx->skb) &&
		(key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
	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)))
		tx->key = key;
	else
		tx->key = NULL;

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

		/* TODO: add threshold stuff again */

		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
			if (!ieee80211_is_data_present(hdr->frame_control))
				tx->key = NULL;
			break;
		case WLAN_CIPHER_SUITE_CCMP:
		case WLAN_CIPHER_SUITE_CCMP_256:
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb) &&
			    !ieee80211_is_group_privacy_action(tx->skb))
				tx->key = NULL;
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
					ieee80211_is_mgmt(hdr->frame_control);
			break;
		case WLAN_CIPHER_SUITE_AES_CMAC:
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
		}

		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
			return TX_DROP;

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

	return TX_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
271
60.22%
20
60.61%
Jouni Malinen
110
24.44%
7
21.21%
Masashi Honma
37
8.22%
1
3.03%
Harvey Harrison
16
3.56%
1
3.03%
Max Stepanov
7
1.56%
1
3.03%
Nicolas Cavallari
6
1.33%
1
3.03%
Ron Rindjunsky
2
0.44%
1
3.03%
Kalle Valo
1
0.22%
1
3.03%
Total
450
100.00%
33
100.00%


static ieee80211_tx_result debug_noinline

ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	u32 len;
	struct ieee80211_tx_rate_control txrc;
	struct ieee80211_sta_rates *ratetbl = NULL;
	bool assoc = false;

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

	sband = tx->local->hw.wiphy->bands[info->band];

	len = min_t(u32, tx->skb->len + FCS_LEN,
			 tx->local->hw.wiphy->frag_threshold);

	/* set up the tx rate control struct we give the RC algo */
	txrc.hw = &tx->local->hw;
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->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;

	if (tx->sdata->rc_has_mcs_mask[info->band])
		txrc.rate_idx_mcs_mask =
			tx->sdata->rc_rateidx_mcs_mask[info->band];

	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP