tx.c 87.5 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>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

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

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

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
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				 int next_frag_len)
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{
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	int rate, mrate, erp, dur, i, shift = 0;
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	struct ieee80211_rate *txrate;
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	struct ieee80211_local *local = tx->local;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_hdr *hdr;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	struct ieee80211_chanctx_conf *chanctx_conf;
	u32 rate_flags = 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();
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	/* assume HW handles this */
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	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
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		return 0;

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

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

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

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		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
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			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
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		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;
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		case IEEE80211_BAND_60GHZ:
			/* TODO, for now fall through */
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		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 */
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		rate = DIV_ROUND_UP(mrate, 1 << shift);
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	}

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

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	return cpu_to_le16(dur);
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}

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

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

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

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

	if (!local->ps_sdata)
		return TX_CONTINUE;

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

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

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

	/*
	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
	 * u-apsd enabled and the frame is in voip class. This effectively
	 * means that even if all access categories have u-apsd enabled, in
	 * practise u-apsd is only used with the voip ac. This is a
	 * workaround for the case when received voip class packets do not
	 * have correct qos tag for some reason, due the network or the
	 * peer application.
	 *
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	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
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	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
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	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
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		return TX_CONTINUE;

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

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

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

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	bool assoc = false;
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	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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		return TX_CONTINUE;
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	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
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	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
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		return TX_DROP;
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	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
		return TX_CONTINUE;

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

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

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!assoc &&
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			     ieee80211_is_data(hdr->frame_control))) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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			sdata_info(tx->sdata,
				   "dropped data frame to not associated station %pM\n",
				   hdr->addr1);
#endif
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			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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			return TX_DROP;
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		}
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	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
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			    !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
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		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
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	}

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	return TX_CONTINUE;
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}

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

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

		if (sdata->vif.type == NL80211_IFTYPE_AP)
			ps = &sdata->u.ap.ps;
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		else if (ieee80211_vif_is_mesh(&sdata->vif))
			ps = &sdata->u.mesh.ps;
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		else
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			continue;
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		skb = skb_dequeue(&ps->bc_buf);
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		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
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		total += skb_queue_len(&ps->bc_buf);
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	}

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

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
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				ieee80211_free_txskb(&local->hw, skb);
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				break;
			}
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		}
	}
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	local->total_ps_buffered = total;
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	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
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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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	struct ps_data *ps;
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	/*
	 * broadcast/multicast frame
	 *
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	 * If any of the associated/peer stations is in power save mode,
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	 * 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 currently only in AP/VLAN/mesh mode */
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	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;
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	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
		ps = &tx->sdata->u.mesh.ps;
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	} else {
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		return TX_CONTINUE;
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	}

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

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	if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;

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

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

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

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

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	if (!ieee80211_is_robust_mgmt_frame(skb))
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		return 0;

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ieee80211_local *local = tx->local;
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	if (unlikely(!sta))
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		return TX_CONTINUE;
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	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
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		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
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		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
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		int ac = skb_get_queue_mapping(tx->skb);

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		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;
		}

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		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
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		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
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		/* 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) &&
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		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
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			spin_unlock(&sta->ps_lock);
			return TX_CONTINUE;
		}

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		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
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			ps_dbg(tx->sdata,
			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
			       sta->sta.addr, ac);
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			ieee80211_free_txskb(&local->hw, old);
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		} else
			tx->local->total_ps_buffered++;
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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
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		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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		spin_unlock(&sta->ps_lock);
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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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

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		return TX_QUEUED;
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	} 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);
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	}

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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)
549
{
550
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
551
		return TX_CONTINUE;
552

553
	if (tx->flags & IEEE80211_TX_UNICAST)
554 555 556 557 558
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

559 560 561 562 563
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);

564 565 566 567 568
	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;
	}
569 570 571 572

	return TX_CONTINUE;
}

573
static ieee80211_tx_result debug_noinline
574
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
575
{
576
	struct ieee80211_key *key;
577
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
578
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
579

J
Johannes Berg 已提交
580
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
581
		tx->key = NULL;
582 583
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
584
		tx->key = key;
585
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
586
		 is_multicast_ether_addr(hdr->addr1) &&
587
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
588 589
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
590 591 592 593 594
	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)))
595
		tx->key = key;
596 597 598 599 600 601
	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
		tx->key = NULL;
	else if (!tx->sdata->drop_unencrypted)
		tx->key = NULL;
	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
		tx->key = NULL;
602
	else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
603 604 605
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
606
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
607
		 !ieee80211_is_robust_mgmt_frame(tx->skb))
608
		tx->key = NULL;
609
	else {
610
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
611
		return TX_DROP;
612
	}
613 614

	if (tx->key) {
615 616
		bool skip_hw = false;

617
		tx->key->tx_rx_count++;
618
		/* TODO: add threshold stuff again */
619

620 621 622 623
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
624
			if (!ieee80211_is_data_present(hdr->frame_control))
625 626
				tx->key = NULL;
			break;
627
		case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
628
		case WLAN_CIPHER_SUITE_CCMP_256:
629 630
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
631 632 633 634
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
635 636
			else
				skip_hw = (tx->key->conf.flags &
637
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638
					ieee80211_is_mgmt(hdr->frame_control);
639
			break;
640
		case WLAN_CIPHER_SUITE_AES_CMAC:
641
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642 643
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644 645 646
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
647
		}
648

649 650
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
651 652
			return TX_DROP;

J
Johannes Berg 已提交
653
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
654
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655
			info->control.hw_key = &tx->key->conf;
656 657
	}

658
	return TX_CONTINUE;
659 660
}

661
static ieee80211_tx_result debug_noinline
662
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
663
{
664
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 666
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
667
	u32 len;
668
	struct ieee80211_tx_rate_control txrc;
669
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
670
	bool assoc = false;
671

672
	memset(&txrc, 0, sizeof(txrc));
673

674
	sband = tx->local->hw.wiphy->bands[info->band];
675

S
Shanyu Zhao 已提交
676
	len = min_t(u32, tx->skb->len + FCS_LEN,
677
			 tx->local->hw.wiphy->frag_threshold);
678 679

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
680
	txrc.hw = &tx->local->hw;
681 682 683 684
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
685
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
686 687 688 689
	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;
690 691 692 693 694

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

695
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
696
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
697
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
698 699

	/* set up RTS protection if desired */
700
	if (len > tx->local->hw.wiphy->rts_threshold) {
701
		txrc.rts = true;
702 703
	}

704
	info->control.use_rts = txrc.rts;
705 706
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

707 708 709 710 711 712 713 714
	/*
	 * 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) ||
J
Johannes Berg 已提交
715
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
716 717 718
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
719

J
Johannes Berg 已提交
720 721
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
722 723 724 725 726

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
J
Johannes Berg 已提交
727
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
728 729 730 731
		 !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",
732
		 tx->sdata->name, hdr->addr1,
733
		 info->band ? 5 : 2))
734
		return TX_DROP;
735

736 737 738 739
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
740 741
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
	if (tx->sta && !info->control.skip_table)
		ratetbl = rcu_dereference(tx->sta->sta.rates);

	if (unlikely(info->control.rates[0].idx < 0)) {
		if (ratetbl) {
			struct ieee80211_tx_rate rate = {
				.idx = ratetbl->rate[0].idx,
				.flags = ratetbl->rate[0].flags,
				.count = ratetbl->rate[0].count
			};

			if (ratetbl->rate[0].idx < 0)
				return TX_DROP;

			tx->rate = rate;
		} else {
			return TX_DROP;
		}
	} else {
		tx->rate = info->control.rates[0];
	}
763

764
	if (txrc.reported_rate.idx < 0) {
765
		txrc.reported_rate = tx->rate;
766 767 768
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
769
		tx->sta->last_tx_rate = txrc.reported_rate;
770

771 772 773
	if (ratetbl)
		return TX_CONTINUE;

774 775
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
776

777 778 779 780
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

781 782 783
	return TX_CONTINUE;
}

784 785 786 787 788 789 790 791 792
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;

793 794 795 796 797
	/*
	 * 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.
	 */
798
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
799 800
		return TX_CONTINUE;

801 802 803 804 805 806
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

807 808 809
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
810 811 812
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
813 814
	 * counter.  QoS data frames with a multicast destination
	 * also use the global counter (802.11-2012 9.3.2.10).
J
Johannes Berg 已提交
815
	 */
816 817
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
818
		/* driver should assign sequence number */
819
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
820 821 822
		/* 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;
823 824
		if (tx->sta)
			tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
		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];
841
	tx->sta->tx_msdu[tid]++;
842 843 844 845 846 847 848 849 850

	hdr->seq_ctrl = cpu_to_le16(*seq);

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

	return TX_CONTINUE;
}

851
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
852 853 854
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
855
	struct ieee80211_local *local = tx->local;
856
	struct ieee80211_tx_info *info;
857
	struct sk_buff *tmp;
J
Johannes Berg 已提交
858 859 860 861 862 863 864
	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;

865 866
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
867 868 869 870 871 872 873 874
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
875
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
876 877 878
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
879 880 881

		__skb_queue_tail(&tx->skbs, tmp);

882 883 884
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
885 886
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
887 888 889 890 891 892 893 894

		info = IEEE80211_SKB_CB(tmp);
		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
				 IEEE80211_TX_CTL_FIRST_FRAGMENT);

		if (rem)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

J
Johannes Berg 已提交
895 896 897 898 899 900 901 902 903 904 905
		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;
	}

906
	/* adjust first fragment's length */
907
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
908 909 910
	return 0;
}

911
static ieee80211_tx_result debug_noinline
912 913
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
914 915 916
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
917
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
918 919
	int hdrlen;
	int fragnum;
920

921 922 923 924
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

925 926 927 928
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
929 930
		return TX_CONTINUE;

931 932
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
933
	 * This scenario is handled in ieee80211_tx_prepare but extra
934
	 * caution taken here as fragmented ampdu may cause Tx stop.
935
	 */
S
Sujith 已提交
936
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
937 938
		return TX_DROP;

939
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
940

941
	/* internal error, why isn't DONTFRAG set? */
942
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
943
		return TX_DROP;
944

J
Johannes Berg 已提交
945 946 947 948 949 950 951 952
	/*
	 * 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.
	 */
953
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
954
		return TX_DROP;
955

J
Johannes Berg 已提交
956 957
	/* update duration/seq/flags of fragments */
	fragnum = 0;
958 959

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
960
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
961

J
Johannes Berg 已提交
962 963
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
964

965
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
966
			hdr->frame_control |= morefrags;
967 968 969 970 971 972 973
			/*
			 * 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;
974
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
975
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
976 977
		} else {
			hdr->frame_control &= ~morefrags;
978
		}
J
Johannes Berg 已提交
979 980
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
981
	}
982

983
	return TX_CONTINUE;
984 985
}

986 987 988
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
989
	struct sk_buff *skb;
990
	int ac = -1;
991 992 993 994

	if (!tx->sta)
		return TX_CONTINUE;

995
	skb_queue_walk(&tx->skbs, skb) {
996
		ac = skb_get_queue_mapping(skb);
997
		tx->sta->tx_fragments++;
998
		tx->sta->tx_bytes[ac] += skb->len;
999
	}
1000 1001
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
1002 1003 1004 1005

	return TX_CONTINUE;
}

1006
static ieee80211_tx_result debug_noinline
1007 1008 1009 1010 1011
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1012 1013 1014
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1015
		return ieee80211_crypto_wep_encrypt(tx);
1016
	case WLAN_CIPHER_SUITE_TKIP:
1017
		return ieee80211_crypto_tkip_encrypt(tx);
1018
	case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
1019 1020 1021 1022 1023
		return ieee80211_crypto_ccmp_encrypt(
			tx, IEEE80211_CCMP_MIC_LEN);
	case WLAN_CIPHER_SUITE_CCMP_256:
		return ieee80211_crypto_ccmp_encrypt(
			tx, IEEE80211_CCMP_256_MIC_LEN);
1024
	case WLAN_CIPHER_SUITE_AES_CMAC:
1025
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1026 1027
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1028 1029 1030
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		return ieee80211_crypto_aes_gmac_encrypt(tx);
1031 1032 1033
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		return ieee80211_crypto_gcmp_encrypt(tx);
1034
	default:
1035
		return ieee80211_crypto_hw_encrypt(tx);
1036 1037 1038 1039 1040
	}

	return TX_DROP;
}

1041
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1042 1043
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1044
	struct sk_buff *skb;
J
Johannes Berg 已提交
1045 1046 1047
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1048

1049
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1050
		hdr = (void *) skb->data;
1051 1052
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1053 1054 1055 1056 1057
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
Johannes Berg 已提交
1058
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1059

J
Johannes Berg 已提交
1060
		hdr->duration_id =
1061 1062
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1063 1064 1065 1066

	return TX_CONTINUE;
}

1067 1068
/* actual transmit path */

1069 1070 1071 1072 1073 1074 1075
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;
1076
	bool reset_agg_timer = false;
1077
	struct sk_buff *purge_skb = NULL;
1078 1079 1080

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1081
		reset_agg_timer = true;
1082 1083 1084 1085 1086
	} 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
		 */
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
	} 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
1107
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1108 1109 1110 1111 1112

		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;
1113
			reset_agg_timer = true;
1114 1115 1116 1117
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1118
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1119
			__skb_queue_tail(&tid_tx->pending, skb);
1120 1121
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1122 1123
		}
		spin_unlock(&tx->sta->lock);
1124 1125

		if (purge_skb)
1126
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1127 1128
	}

1129 1130
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1131
		tid_tx->last_tx = jiffies;
1132

1133 1134 1135
	return queued;
}

1136 1137 1138
/*
 * initialises @tx
 */
1139
static ieee80211_tx_result
J
Johannes Berg 已提交
1140 1141 1142
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1143
{
J
Johannes Berg 已提交
1144
	struct ieee80211_local *local = sdata->local;
1145
	struct ieee80211_hdr *hdr;
1146
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1147
	int tid;
1148
	u8 *qc;
1149 1150 1151 1152

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1153
	tx->sdata = sdata;
1154
	__skb_queue_head_init(&tx->skbs);
1155

1156 1157 1158 1159 1160 1161 1162
	/*
	 * 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;

1163 1164
	hdr = (struct ieee80211_hdr *) skb->data;

1165
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1166
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1167 1168
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1169 1170
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1171
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1172
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1173
	}
1174
	if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1175
		tx->sta = sta_info_get(sdata, hdr->addr1);
1176

1177
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1178
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1179 1180
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1181 1182
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1183 1184 1185
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1186 1187 1188
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1189

1190 1191 1192 1193 1194 1195
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1196 1197
	}

1198
	if (is_multicast_ether_addr(hdr->addr1)) {
1199
		tx->flags &= ~IEEE80211_TX_UNICAST;
1200
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1201
	} else
1202
		tx->flags |= IEEE80211_TX_UNICAST;
1203

1204 1205 1206 1207 1208
	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1209 1210
	}

1211
	if (!tx->sta)
1212
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1213
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1214
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1215

1216
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1217

1218
	return TX_CONTINUE;
1219 1220
}

1221 1222 1223 1224 1225
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1226
{
1227
	struct ieee80211_tx_control control;
1228
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1229
	unsigned long flags;
1230

1231
	skb_queue_walk_safe(skbs, skb, tmp) {
1232 1233 1234 1235 1236 1237
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		int q = info->hw_queue;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (WARN_ON_ONCE(q >= local->hw.queues)) {
			__skb_unlink(skb, skbs);
1238
			ieee80211_free_txskb(&local->hw, skb);
1239 1240 1241
			continue;
		}
#endif
J
Johannes Berg 已提交
1242 1243 1244

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1245
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1246
			if (unlikely(info->flags &
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
				if (local->queue_stop_reasons[q] &
				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
					/*
					 * Drop off-channel frames if queues
					 * are stopped for any reason other
					 * than off-channel operation. Never
					 * queue them.
					 */
					spin_unlock_irqrestore(
						&local->queue_stop_reason_lock,
						flags);
					ieee80211_purge_tx_queue(&local->hw,
								 skbs);
					return true;
				}
			} else {

1265
				/*
1266 1267 1268
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1269
				 */
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
				if (txpending)
					skb_queue_splice_init(skbs,
							      &local->pending[q]);
				else
					skb_queue_splice_tail_init(skbs,
								   &local->pending[q]);

				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				return false;
1280
			}
1281
		}
J
Johannes Berg 已提交
1282
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1283

1284
		info->control.vif = vif;
1285
		control.sta = sta;
1286

1287
		__skb_unlink(skb, skbs);
1288
		drv_tx(local, &control, skb);
1289
	}
1290

1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
	return true;
}

/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local,
			   struct sk_buff_head *skbs, int led_len,
			   struct sta_info *sta, bool txpending)
{
	struct ieee80211_tx_info *info;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_vif *vif;
	struct ieee80211_sta *pubsta;
	struct sk_buff *skb;
	bool result = true;
	__le16 fc;
1308

1309 1310
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1311

1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
	skb = skb_peek(skbs);
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
	info = IEEE80211_SKB_CB(skb);
	sdata = vif_to_sdata(info->control.vif);
	if (sta && !sta->uploaded)
		sta = NULL;

	if (sta)
		pubsta = &sta->sta;
	else
		pubsta = NULL;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MONITOR:
1326 1327 1328 1329
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1330
		sdata = rcu_dereference(local->monitor_sdata);
1331
		if (sdata) {
1332
			vif = &sdata->vif;
1333 1334 1335 1336 1337 1338
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
		} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
			dev_kfree_skb(skb);
			return true;
		} else
1339
			vif = NULL;
1340 1341 1342 1343 1344 1345 1346 1347
		break;
	case NL80211_IFTYPE_AP_VLAN:
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);
		/* fall through */
	default:
		vif = &sdata->vif;
		break;
1348
	}
J
Johannes Berg 已提交
1349

1350 1351
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1352

1353 1354
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1355
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1356

1357
	return result;
1358 1359
}

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

1369 1370 1371 1372 1373 1374 1375
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1376
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1377 1378
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1379
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1380
	CALL_TXH(ieee80211_tx_h_select_key);
1381 1382
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1383

J
Johannes Berg 已提交
1384 1385 1386
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1387
		goto txh_done;
J
Johannes Berg 已提交
1388
	}
1389 1390

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1391 1392
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1393
	/* handlers after fragment must be aware of tx info fragmentation! */
1394 1395
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1396 1397
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1398
#undef CALL_TXH
1399

1400
 txh_done:
1401
	if (unlikely(res == TX_DROP)) {
1402
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1403
		if (tx->skb)
1404
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1405
		else
1406
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1407 1408
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1409
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1410 1411 1412 1413 1414 1415
		return -1;
	}

	return 0;
}

1416 1417 1418 1419 1420 1421 1422
bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, struct sk_buff *skb,
			      int band, struct ieee80211_sta **sta)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_data tx;
1423
	struct sk_buff *skb2;
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441

	if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
		return false;

	info->band = band;
	info->control.vif = vif;
	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];

	if (invoke_tx_handlers(&tx))
		return false;

	if (sta) {
		if (tx.sta)
			*sta = &tx.sta->sta;
		else
			*sta = NULL;
	}

1442 1443 1444 1445 1446 1447 1448 1449
	/* this function isn't suitable for fragmented data frames */
	skb2 = __skb_dequeue(&tx.skbs);
	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
		ieee80211_free_txskb(hw, skb2);
		ieee80211_purge_tx_queue(hw, &tx.skbs);
		return false;
	}

1450 1451 1452 1453
	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1454 1455 1456 1457
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1458
			 struct sk_buff *skb, bool txpending)
1459
{
J
Johannes Berg 已提交
1460
	struct ieee80211_local *local = sdata->local;
1461
	struct ieee80211_tx_data tx;
1462
	ieee80211_tx_result res_prepare;
1463
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1464
	bool result = true;
1465
	int led_len;
1466 1467 1468

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1469
		return true;
1470 1471
	}

1472
	/* initialises tx */
1473
	led_len = skb->len;
J
Johannes Berg 已提交
1474
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1475

1476
	if (unlikely(res_prepare == TX_DROP)) {
1477
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1478
		return true;
1479
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1480
		return true;
1481 1482
	}

1483 1484 1485 1486 1487 1488
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
	    !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1489
	if (!invoke_tx_handlers(&tx))
1490 1491
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1492

1493
	return result;
1494 1495 1496 1497
}

/* device xmit handlers */

1498
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1499 1500 1501
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1502
	struct ieee80211_local *local = sdata->local;
1503 1504
	int tail_need = 0;

1505
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1506 1507 1508 1509 1510
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1511 1512 1513 1514
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
	     sdata->crypto_tx_tailroom_needed_cnt))
1515
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1516
	else if (head_need || tail_need)
1517
		I802_DEBUG_INC(local->tx_expand_skb_head);
1518 1519
	else
		return 0;
1520 1521

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1522 1523
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1524 1525 1526 1527 1528 1529
		return -ENOMEM;
	}

	return 0;
}

1530
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1531
{
J
Johannes Berg 已提交
1532
	struct ieee80211_local *local = sdata->local;
1533
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1534
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1535
	int headroom;
1536
	bool may_encrypt;
1537

J
Johannes Berg 已提交
1538
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1539

J
Johannes Berg 已提交
1540
	headroom = local->tx_headroom;
1541
	if (may_encrypt)
1542
		headroom += sdata->encrypt_headroom;
1543 1544 1545
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1546
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1547
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1548
		return;
1549 1550
	}

1551
	hdr = (struct ieee80211_hdr *) skb->data;
1552
	info->control.vif = &sdata->vif;
1553

M
Marco Porsch 已提交
1554 1555 1556
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
		if (ieee80211_is_data(hdr->frame_control) &&
		    is_unicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
1557
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1558 1559 1560 1561
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1562
	}
1563

1564
	ieee80211_set_qos_hdr(sdata, skb);
1565
	ieee80211_tx(sdata, skb, false);
1566 1567
}

1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
{
	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
	u16 txflags;

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
		       IEEE80211_TX_CTL_DONTFRAG;

	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

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

		if (ret)
			continue;

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

				skb_trim(skb, skb->len - FCS_LEN);
			}
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
			break;

		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = get_unaligned_le16(iterator.this_arg);
			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
				info->flags |= IEEE80211_TX_CTL_NO_ACK;
			break;

		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

		default:
			break;
		}
	}

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

	/*
	 * remove the radiotap header
	 * iterator->_max_length was sanity-checked against
	 * skb->len by iterator init
	 */
	skb_pull(skb, iterator._max_length);

	return true;
}

1651 1652
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1653 1654
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1655
	struct ieee80211_chanctx_conf *chanctx_conf;
1656 1657
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1658
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1659
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1660
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1661
	struct cfg80211_chan_def *chandef;
1662
	u16 len_rthdr;
J
Johannes Berg 已提交
1663
	int hdrlen;
1664

1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	/* 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 */
1679 1680 1681 1682 1683 1684 1685

	/*
	 * 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
	 */
1686
	skb_set_mac_header(skb, len_rthdr);
1687
	/*
1688 1689
	 * 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
1690
	 */
1691 1692
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1693

J
Johannes Berg 已提交
1694 1695 1696 1697 1698 1699 1700 1701 1702
	if (skb->len < len_rthdr + 2)
		goto fail;

	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < len_rthdr + hdrlen)
		goto fail;

1703 1704 1705 1706
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1707 1708 1709 1710
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1711
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1712 1713
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1714 1715
	}

J
Johannes Berg 已提交
1716 1717
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1718
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1719 1720 1721 1722 1723
		      IEEE80211_TX_CTL_INJECTED;

	/* process and remove the injection radiotap header */
	if (!ieee80211_parse_tx_radiotap(skb))
		goto fail;
J
Johannes Berg 已提交
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743

	rcu_read_lock();

	/*
	 * We process outgoing injected frames that have a local address
	 * we handle as though they are non-injected frames.
	 * This code here isn't entirely correct, the local MAC address
	 * isn't always enough to find the interface to use; for proper
	 * VLAN/WDS support we will need a different mechanism (which
	 * likely isn't going to be monitor interfaces).
	 */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(tmp_sdata))
			continue;
		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
			continue;
1744
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1745 1746 1747 1748
			sdata = tmp_sdata;
			break;
		}
	}
1749

J
Johannes Berg 已提交
1750 1751 1752 1753 1754 1755 1756 1757
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		tmp_sdata = rcu_dereference(local->monitor_sdata);
		if (tmp_sdata)
			chanctx_conf =
				rcu_dereference(tmp_sdata->vif.chanctx_conf);
	}

1758
	if (chanctx_conf)
1759
		chandef = &chanctx_conf->def;
1760
	else if (!local->use_chanctx)
1761
		chandef = &local->_oper_chandef;
1762 1763
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780

	/*
	 * 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.
	 */
1781 1782
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1783 1784
		goto fail_rcu;

1785 1786
	info->band = chandef->chan->band;
	ieee80211_xmit(sdata, skb);
J
Johannes Berg 已提交
1787 1788
	rcu_read_unlock();

1789
	return NETDEV_TX_OK;
1790

J
Johannes Berg 已提交
1791 1792
fail_rcu:
	rcu_read_unlock();
1793 1794 1795
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1796 1797 1798
}

/**
1799 1800 1801
 * ieee80211_build_hdr - build 802.11 header in the given frame
 * @sdata: virtual interface to build the header for
 * @skb: the skb to build the header in
1802
 * @info_flags: skb flags to set
1803
 *
1804 1805 1806 1807 1808 1809 1810
 * This function takes the skb with 802.3 header and reformats the header to
 * the appropriate IEEE 802.11 header based on which interface the packet is
 * being transmitted on.
 *
 * Note that this function also takes care of the TX status request and
 * potential unsharing of the SKB - this needs to be interleaved with the
 * header building.
1811
 *
1812 1813 1814
 * The function requires the read-side RCU lock held
 *
 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1815
 */
1816 1817
static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
					   struct sk_buff *skb, u32 info_flags)
1818
{
1819
	struct ieee80211_local *local = sdata->local;
1820
	struct ieee80211_tx_info *info;
1821
	int head_need;
1822 1823
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1824
	struct ieee80211_hdr hdr;
1825
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1826
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1827 1828
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1829
	int nh_pos, h_pos;
1830
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1831
	bool wme_sta = false, authorized = false, tdls_auth = false;
1832
	bool tdls_peer = false, tdls_setup_frame = false;
J
Johannes Berg 已提交
1833 1834
	bool multicast;
	u16 info_id = 0;
J
Johannes Berg 已提交
1835 1836 1837
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1838
	int ret;
1839 1840 1841 1842

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1843
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1844

1845
	switch (sdata->vif.type) {
1846
	case NL80211_IFTYPE_AP_VLAN:
1847
		sta = rcu_dereference(sdata->u.vlan.sta);
1848 1849 1850 1851
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1852
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1853 1854 1855
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1856
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1857
			wme_sta = sta->sta.wme;
1858
		}
J
Johannes Berg 已提交
1859 1860 1861
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1862 1863 1864 1865
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
1866
		band = chanctx_conf->def.chan->band;
1867 1868 1869 1870
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1871 1872
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1873 1874 1875 1876
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
1877
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1878 1879
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1880
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1881 1882
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1883
		band = chanctx_conf->def.chan->band;
1884
		break;
1885
	case NL80211_IFTYPE_WDS:
1886
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1887 1888
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1889
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1890 1891 1892
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1893 1894 1895 1896
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
1897
		band = local->hw.conf.chandef.chan->band;
1898
		break;
1899
#ifdef CONFIG_MAC80211_MESH
1900
	case NL80211_IFTYPE_MESH_POINT:
1901
		if (!is_multicast_ether_addr(skb->data)) {
1902 1903 1904
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1905
			mpath = mesh_path_lookup(sdata, skb->data);
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
			if (mpath) {
				mpp_lookup = false;
				next_hop = rcu_dereference(mpath->next_hop);
				if (!next_hop ||
				    !(mpath->flags & (MESH_PATH_ACTIVE |
						      MESH_PATH_RESOLVING)))
					mpp_lookup = true;
			}

			if (mpp_lookup)
J
Johannes Berg 已提交
1916
				mppath = mpp_path_lookup(sdata, skb->data);
1917 1918 1919

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1920
		}
1921

1922
		/*
1923 1924 1925 1926
		 * 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)
1927
		 */
1928 1929
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1930 1931
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1932 1933
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1934
		} else {
1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
			/* DS -> MBSS (802.11-2012 13.11.3.3).
			 * For unicast with unknown forwarding information,
			 * destination might be in the MBSS or if that fails
			 * forwarded to another mesh gate. In either case
			 * resolution will be handled in ieee80211_xmit(), so
			 * leave the original DA. This also works for mcast */
			const u8 *mesh_da = skb->data;

			if (mppath)
				mesh_da = mppath->mpp;
			else if (mpath)
				mesh_da = mpath->dst;
1947

1948
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1949
					mesh_da, sdata->vif.addr);
1950 1951
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1952 1953 1954
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1955
			else
1956
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1957 1958 1959
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1960 1961

		}
J
Johannes Berg 已提交
1962
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1963 1964 1965 1966
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
1967
		band = chanctx_conf->def.chan->band;
1968 1969
		break;
#endif
1970
	case NL80211_IFTYPE_STATION:
1971 1972
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1973 1974 1975
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
1976
				wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
1977
				tdls_peer = test_sta_flag(sta,
1978
							  WLAN_STA_TDLS_PEER);
J
Johannes Berg 已提交
1979 1980 1981
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1982

1983 1984 1985 1986 1987
			if (tdls_peer)
				tdls_setup_frame =
					ethertype == ETH_P_TDLS &&
					skb->len > 14 &&
					skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1988 1989
		}

1990 1991 1992 1993 1994 1995
		/*
		 * TDLS link during setup - throw out frames to peer. We allow
		 * TDLS-setup frames to unauthorized peers for the special case
		 * of a link teardown after a TDLS sta is removed due to being
		 * unreachable.
		 */
1996 1997 1998 1999
		if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
			ret = -EINVAL;
			goto free;
		}
2000

2001 2002
		/* send direct packets to authorized TDLS peers */
		if (tdls_peer && tdls_auth) {
2003 2004 2005 2006 2007 2008 2009 2010 2011
			/* DA SA BSSID */
			memcpy(hdr.addr1, skb->data, ETH_ALEN);
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
			hdrlen = 24;
		}  else if (sdata->u.mgd.use_4addr &&
			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
2012
			/* RA TA DA SA */
2013
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2014
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2015 2016 2017 2018 2019 2020
			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 */
2021
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2022 2023 2024 2025
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2026
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2027 2028 2029 2030
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2031
		band = chanctx_conf->def.chan->band;
2032
		break;
2033 2034 2035 2036 2037 2038 2039
	case NL80211_IFTYPE_OCB:
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
		eth_broadcast_addr(hdr.addr3);
		hdrlen = 24;
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2040 2041 2042 2043
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2044 2045
		band = chanctx_conf->def.chan->band;
		break;
2046
	case NL80211_IFTYPE_ADHOC:
2047 2048 2049
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2050
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2051
		hdrlen = 24;
J
Johannes Berg 已提交
2052
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2053 2054 2055 2056
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2057
		band = chanctx_conf->def.chan->band;
2058 2059
		break;
	default:
2060 2061
		ret = -EINVAL;
		goto free;
2062 2063
	}

2064 2065 2066 2067 2068
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
J
Johannes Berg 已提交
2069 2070
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
2071
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
2072 2073
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2074
			wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
2075
		}
2076 2077
	}

2078 2079
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2080
		wme_sta = true;
2081

2082
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2083
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2084
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2085 2086 2087 2088
		hdrlen += 2;
	}

	/*
2089 2090
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2091
	 */
2092
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2093
		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2094
		     !multicast && !authorized &&
2095
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2096
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2097
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2098
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2099
				    sdata->name, hdr.addr1);
2100 2101 2102 2103
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

2104 2105
		ret = -EPERM;
		goto free;
2106 2107
	}

J
Johannes Berg 已提交
2108 2109
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2110
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2111

2112
		if (ack_skb) {
J
Johannes Berg 已提交
2113
			unsigned long flags;
T
Tejun Heo 已提交
2114
			int id;
J
Johannes Berg 已提交
2115 2116

			spin_lock_irqsave(&local->ack_status_lock, flags);
2117
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2118
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2119 2120
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2121
			if (id >= 0) {
J
Johannes Berg 已提交
2122 2123 2124
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2125
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2126 2127 2128 2129
			}
		}
	}

2130 2131 2132 2133
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2134 2135 2136 2137 2138
		struct sk_buff *tmp_skb = skb;

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

2139
		skb = skb_clone(skb, GFP_ATOMIC);
2140 2141
		kfree_skb(tmp_skb);

2142 2143 2144 2145
		if (!skb) {
			ret = -ENOMEM;
			goto free;
		}
2146 2147
	}

2148
	hdr.frame_control = fc;
2149 2150 2151 2152 2153 2154 2155 2156
	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;
S
Simon Horman 已提交
2157
	} else if (ethertype >= ETH_P_802_3_MIN) {
2158 2159 2160 2161 2162 2163 2164 2165
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2166 2167 2168
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2169 2170 2171 2172
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2173
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2174

2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185
	/*
	 * 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.
	 */
2186

2187
	if (head_need > 0 || skb_cloned(skb)) {
2188
		head_need += sdata->encrypt_headroom;
2189 2190
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2191 2192
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2193
			skb = NULL;
2194
			return ERR_PTR(-ENOMEM);
2195
		}
2196 2197 2198 2199 2200 2201 2202
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2203

2204
#ifdef CONFIG_MAC80211_MESH
2205 2206 2207 2208 2209
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2210
#endif
2211

2212
	if (ieee80211_is_data_qos(fc)) {
2213 2214
		__le16 *qos_control;

W
Weilong Chen 已提交
2215
		qos_control = (__le16 *) skb_push(skb, 2);
2216 2217 2218 2219 2220 2221 2222 2223 2224
		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);

2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	nh_pos += hdrlen;
	h_pos += hdrlen;

	/* 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);

2235
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2236 2237
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
2238 2239
	info->flags = info_flags;
	info->ack_frame_id = info_id;
2240
	info->band = band;
J
Johannes Berg 已提交
2241

2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259
	return skb;
 free:
	kfree_skb(skb);
	return ERR_PTR(ret);
}

void __ieee80211_subif_start_xmit(struct sk_buff *skb,
				  struct net_device *dev,
				  u32 info_flags)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	if (unlikely(skb->len < ETH_HLEN)) {
		kfree_skb(skb);
		return;
	}

	rcu_read_lock();
2260

2261 2262 2263 2264 2265 2266 2267
	skb = ieee80211_build_hdr(sdata, skb, info_flags);
	if (IS_ERR(skb))
		goto out;

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
	dev->trans_start = jiffies;
2268

2269 2270
	ieee80211_xmit(sdata, skb);
 out:
J
Johannes Berg 已提交
2271
	rcu_read_unlock();
2272 2273
}

2274 2275 2276 2277 2278 2279 2280
/**
 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
 * @skb: packet to be sent
 * @dev: incoming interface
 *
 * On failure skb will be freed.
 */
2281 2282 2283 2284 2285 2286
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				       struct net_device *dev)
{
	__ieee80211_subif_start_xmit(skb, dev, 0);
	return NETDEV_TX_OK;
}
2287

2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
			      struct sk_buff *skb, u32 info_flags)
{
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_data tx = {
		.local = sdata->local,
		.sdata = sdata,
	};

	rcu_read_lock();

	skb = ieee80211_build_hdr(sdata, skb, info_flags);
	if (IS_ERR(skb))
		goto out;

	hdr = (void *)skb->data;
	tx.sta = sta_info_get(sdata, hdr->addr1);
	tx.skb = skb;

	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
		rcu_read_unlock();
		kfree_skb(skb);
		return ERR_PTR(-EINVAL);
	}

out:
	rcu_read_unlock();
	return skb;
}

2319 2320 2321 2322
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2323 2324
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2325
	struct sk_buff *skb;
J
Johannes Berg 已提交
2326
	int i;
2327

2328 2329 2330 2331
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2332 2333
}

2334 2335 2336 2337 2338
/*
 * 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.
 */
2339 2340 2341 2342 2343 2344 2345
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;
2346
	bool result;
J
Johannes Berg 已提交
2347
	struct ieee80211_chanctx_conf *chanctx_conf;
2348

2349
	sdata = vif_to_sdata(info->control.vif);
2350 2351

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2352 2353 2354 2355 2356
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
2357 2358
		info->band = chanctx_conf->def.chan->band;
		result = ieee80211_tx(sdata, skb, true);
2359
	} else {
2360 2361 2362 2363 2364
		struct sk_buff_head skbs;

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

2365
		hdr = (struct ieee80211_hdr *)skb->data;
2366
		sta = sta_info_get(sdata, hdr->addr1);
2367

2368
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2369 2370 2371 2372 2373
	}

	return result;
}

2374
/*
J
Johannes Berg 已提交
2375
 * Transmit all pending packets. Called from tasklet.
2376
 */
2377 2378 2379
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2380
	unsigned long flags;
2381
	int i;
J
Johannes Berg 已提交
2382
	bool txok;
2383

2384
	rcu_read_lock();
2385

J
Johannes Berg 已提交
2386
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2387 2388 2389 2390 2391
	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
2392
		if (local->queue_stop_reasons[i] ||
2393
		    skb_queue_empty(&local->pending[i]))
2394
			continue;
2395

2396
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2397
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2398 2399
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2400
			if (WARN_ON(!info->control.vif)) {
2401
				ieee80211_free_txskb(&local->hw, skb);
2402 2403 2404
				continue;
			}

J
Johannes Berg 已提交
2405 2406 2407 2408 2409 2410 2411
			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)
2412
				break;
2413
		}
2414 2415

		if (skb_queue_empty(&local->pending[i]))
2416
			ieee80211_propagate_queue_wake(local, i);
2417
	}
J
Johannes Berg 已提交
2418
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2419

2420
	rcu_read_unlock();
2421 2422 2423 2424
}

/* functions for drivers to get certain frames */

2425
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2426 2427
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
2428 2429 2430 2431 2432 2433 2434
{
	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. */
2435
	if (atomic_read(&ps->num_sta_ps) > 0)
2436 2437
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
2438
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
2439
					  IEEE80211_MAX_AID+1);
2440 2441 2442 2443 2444 2445
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
2446 2447 2448 2449

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2450
	*pos++ = ps->dtim_count;
2451
	*pos++ = sdata->vif.bss_conf.dtim_period;
2452

2453
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2454 2455
		aid0 = 1;

2456
	ps->dtim_bc_mc = aid0 == 1;
2457

2458 2459 2460 2461 2462 2463
	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++) {
2464
			if (ps->tim[i]) {
2465 2466 2467 2468 2469 2470
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2471
			if (ps->tim[i]) {
2472 2473 2474 2475 2476 2477 2478 2479
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2480
		skb_put(skb, n2 - n1);
2481
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2482 2483 2484 2485 2486 2487 2488 2489

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

2490
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2491 2492
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503
{
	struct ieee80211_local *local = sdata->local;

	/*
	 * 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) {
2504
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2505
	} else {
J
Johannes Berg 已提交
2506
		spin_lock_bh(&local->tim_lock);
2507
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
2508
		spin_unlock_bh(&local->tim_lock);
2509 2510 2511 2512 2513
	}

	return 0;
}

2514 2515
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
2516 2517
{
	struct probe_resp *resp;
2518 2519
	u8 *beacon_data;
	size_t beacon_data_len;
2520
	int i;
2521
	u8 count = beacon->csa_current_counter;
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
		beacon_data = beacon->tail;
		beacon_data_len = beacon->tail_len;
		break;
	case NL80211_IFTYPE_ADHOC:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2532 2533 2534 2535
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2536 2537 2538
	default:
		return;
	}
2539

2540
	rcu_read_lock();
2541
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2542
		resp = rcu_dereference(sdata->u.ap.probe_resp);
2543

2544 2545 2546
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
2547 2548 2549
				rcu_read_unlock();
				return;
			}
2550 2551

			beacon_data[beacon->csa_counter_offsets[i]] = count;
2552
		}
2553 2554 2555

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
2556
	}
2557
	rcu_read_unlock();
2558 2559 2560 2561 2562
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2563 2564
	struct beacon_data *beacon = NULL;
	u8 count = 0;
2565

2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578
	rcu_read_lock();

	if (sdata->vif.type == NL80211_IFTYPE_AP)
		beacon = rcu_dereference(sdata->u.ap.beacon);
	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		beacon = rcu_dereference(sdata->u.ibss.presp);
	else if (ieee80211_vif_is_mesh(&sdata->vif))
		beacon = rcu_dereference(sdata->u.mesh.beacon);

	if (!beacon)
		goto unlock;

	beacon->csa_current_counter--;
2579 2580

	/* the counter should never reach 0 */
2581 2582
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
2583

2584 2585 2586
unlock:
	rcu_read_unlock();
	return count;
2587
}
2588
EXPORT_SYMBOL(ieee80211_csa_update_counter);
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609

bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct beacon_data *beacon = NULL;
	u8 *beacon_data;
	size_t beacon_data_len;
	int ret = false;

	if (!ieee80211_sdata_running(sdata))
		return false;

	rcu_read_lock();
	if (vif->type == NL80211_IFTYPE_AP) {
		struct ieee80211_if_ap *ap = &sdata->u.ap;

		beacon = rcu_dereference(ap->beacon);
		if (WARN_ON(!beacon || !beacon->tail))
			goto out;
		beacon_data = beacon->tail;
		beacon_data_len = beacon->tail_len;
2610 2611 2612 2613 2614 2615 2616
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
			goto out;

2617 2618 2619 2620 2621 2622 2623 2624 2625
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
			goto out;

2626 2627
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2628 2629 2630 2631 2632
	} else {
		WARN_ON(1);
		goto out;
	}

2633 2634 2635
	if (!beacon->csa_counter_offsets[0])
		goto out;

2636
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2637 2638
		goto out;

2639
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2640 2641 2642 2643 2644 2645 2646 2647
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

2648 2649 2650 2651 2652
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
2653 2654
{
	struct ieee80211_local *local = hw_to_local(hw);
2655
	struct beacon_data *beacon = NULL;
2656
	struct sk_buff *skb = NULL;
2657
	struct ieee80211_tx_info *info;
2658
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2659
	enum ieee80211_band band;
2660
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2661
	struct ieee80211_chanctx_conf *chanctx_conf;
2662
	int csa_off_base = 0;
2663

2664
	rcu_read_lock();
2665

2666
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2667
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2668

J
Johannes Berg 已提交
2669
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2670 2671
		goto out;

2672 2673
	if (offs)
		memset(offs, 0, sizeof(*offs));
2674

2675
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2676 2677
		struct ieee80211_if_ap *ap = &sdata->u.ap;

2678
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2679
		if (beacon) {
2680
			if (beacon->csa_counter_offsets[0]) {
2681 2682 2683 2684 2685
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
2686

J
Johannes Berg 已提交
2687 2688 2689 2690 2691 2692
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
2693 2694
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2695 2696
			if (!skb)
				goto out;
2697

J
Johannes Berg 已提交
2698 2699 2700
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2701

2702 2703
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
2704

2705 2706 2707
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
2708 2709 2710

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
2711
			}
2712

J
Johannes Berg 已提交
2713 2714 2715
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2716 2717
		} else
			goto out;
2718
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2719
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2720
		struct ieee80211_hdr *hdr;
2721

2722 2723
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
2724 2725
			goto out;

2726
		if (beacon->csa_counter_offsets[0]) {
2727 2728
			if (!is_template)
				ieee80211_csa_update_counter(vif);
2729

2730
			ieee80211_set_csa(sdata, beacon);
2731
		}
2732

2733
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2734
				    local->hw.extra_beacon_tailroom);
2735 2736
		if (!skb)
			goto out;
2737
		skb_reserve(skb, local->tx_headroom);
2738 2739
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2740 2741

		hdr = (struct ieee80211_hdr *) skb->data;
2742 2743
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2744
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2745
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2746

2747 2748
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
2749 2750
			goto out;

2751
		if (beacon->csa_counter_offsets[0]) {
2752 2753 2754 2755 2756 2757 2758 2759
			if (!is_template)
				/* TODO: For mesh csa_counter is in TU, so
				 * decrementing it by one isn't correct, but
				 * for now we leave it consistent with overall
				 * mac80211's behavior.
				 */
				ieee80211_csa_update_counter(vif);

2760
			ieee80211_set_csa(sdata, beacon);
2761
		}
2762

2763
		if (ifmsh->sync_ops)
2764
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2765

2766
		skb = dev_alloc_skb(local->tx_headroom +
2767
				    beacon->head_len +
M
Marco Porsch 已提交
2768
				    256 + /* TIM IE */
2769
				    beacon->tail_len +
2770
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2771 2772
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2773
		skb_reserve(skb, local->tx_headroom);
2774 2775
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2776 2777 2778
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
2779 2780
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
2781 2782
		}

2783 2784
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
2785 2786
	} else {
		WARN_ON(1);
2787
		goto out;
2788 2789
	}

2790
	/* CSA offsets */
2791
	if (offs && beacon) {
2792 2793 2794
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2795
			u16 csa_off = beacon->csa_counter_offsets[i];
2796 2797 2798 2799 2800 2801 2802 2803

			if (!csa_off)
				continue;

			offs->csa_counter_offs[i] = csa_off_base + csa_off;
		}
	}

2804
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2805

2806 2807
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2808
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2809
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2810
	info->band = band;
2811 2812 2813

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2814
	txrc.sband = local->hw.wiphy->bands[band];
2815 2816 2817
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2818
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2819
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2820 2821 2822
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2823
	txrc.bss = true;
2824
	rate_control_get_rate(sdata, NULL, &txrc);
2825 2826

	info->control.vif = vif;
2827

2828 2829 2830
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2831
 out:
2832
	rcu_read_unlock();
2833
	return skb;
2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859

}

struct sk_buff *
ieee80211_beacon_get_template(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif,
			      struct ieee80211_mutable_offsets *offs)
{
	return __ieee80211_beacon_get(hw, vif, offs, true);
}
EXPORT_SYMBOL(ieee80211_beacon_get_template);

struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
{
	struct ieee80211_mutable_offsets offs = {};
	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);

	if (tim_offset)
		*tim_offset = offs.tim_offset;

	if (tim_length)
		*tim_length = offs.tim_length;

	return bcn;
2860
}
2861
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2862

2863 2864 2865 2866
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2867 2868
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
	struct ieee80211_hdr *hdr;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return NULL;

	rcu_read_lock();

	ap = &sdata->u.ap;
	presp = rcu_dereference(ap->probe_resp);
	if (!presp)
		goto out;

2882
	skb = dev_alloc_skb(presp->len);
2883 2884 2885
	if (!skb)
		goto out;

2886 2887
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2888 2889 2890 2891 2892 2893 2894 2895 2896
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

out:
	rcu_read_unlock();
	return skb;
}
EXPORT_SYMBOL(ieee80211_proberesp_get);

2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
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));
2914
	if (!skb)
2915
		return NULL;
2916

2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951
	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));
2952
	if (!skb)
2953
		return NULL;
2954

2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970
	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);

2971
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2972
				       const u8 *src_addr,
2973
				       const u8 *ssid, size_t ssid_len,
2974
				       size_t tailroom)
2975
{
2976
	struct ieee80211_local *local = hw_to_local(hw);
2977 2978 2979 2980 2981 2982 2983 2984
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2985
			    ie_ssid_len + tailroom);
2986
	if (!skb)
2987 2988 2989 2990 2991 2992 2993 2994
		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);
J
Johannes Berg 已提交
2995
	eth_broadcast_addr(hdr->addr1);
2996
	memcpy(hdr->addr2, src_addr, ETH_ALEN);
J
Johannes Berg 已提交
2997
	eth_broadcast_addr(hdr->addr3);
2998 2999 3000 3001

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
3002
	if (ssid_len)
3003 3004 3005 3006 3007 3008 3009
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

3010
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3011
		       const void *frame, size_t frame_len,
3012
		       const struct ieee80211_tx_info *frame_txctl,
3013 3014 3015 3016
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

3017 3018
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3019 3020
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
3021 3022 3023 3024 3025
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

3026
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3027
			     const void *frame, size_t frame_len,
3028
			     const struct ieee80211_tx_info *frame_txctl,
3029 3030 3031 3032
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

3033 3034
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3035 3036
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
3037 3038 3039 3040 3041
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
3042
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3043
			  struct ieee80211_vif *vif)
3044 3045
{
	struct ieee80211_local *local = hw_to_local(hw);
3046
	struct sk_buff *skb = NULL;
3047
	struct ieee80211_tx_data tx;
3048
	struct ieee80211_sub_if_data *sdata;
3049
	struct ps_data *ps;
3050
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
3051
	struct ieee80211_chanctx_conf *chanctx_conf;
3052

3053
	sdata = vif_to_sdata(vif);
3054 3055

	rcu_read_lock();
J
Johannes Berg 已提交
3056
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3057

3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068
	if (!chanctx_conf)
		goto out;

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct beacon_data *beacon =
				rcu_dereference(sdata->u.ap.beacon);

		if (!beacon || !beacon->head)
			goto out;

		ps = &sdata->u.ap.ps;
M
Marco Porsch 已提交
3069 3070
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
3071
	} else {
3072
		goto out;
3073
	}
3074

3075
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3076
		goto out; /* send buffered bc/mc only after DTIM beacon */
3077

3078
	while (1) {
3079
		skb = skb_dequeue(&ps->bc_buf);
3080
		if (!skb)
3081
			goto out;
3082 3083
		local->total_ps_buffered--;

3084
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3085 3086 3087 3088 3089 3090 3091 3092 3093
			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);
		}

3094
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3095
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
3096
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
3097 3098 3099
			break;
		dev_kfree_skb_any(skb);
	}
3100 3101 3102

	info = IEEE80211_SKB_CB(skb);

3103
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3104
	info->band = chanctx_conf->def.chan->band;
3105

3106
	if (invoke_tx_handlers(&tx))
3107
		skb = NULL;
3108
 out:
3109
	rcu_read_unlock();
3110 3111 3112 3113

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3114

3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162
int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	int ret;
	u32 queues;

	lockdep_assert_held(&local->sta_mtx);

	/* only some cases are supported right now */
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
		break;
	default:
		WARN_ON(1);
		return -EINVAL;
	}

	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
		return -EINVAL;

	if (sta->reserved_tid == tid) {
		ret = 0;
		goto out;
	}

	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
		sdata_err(sdata, "TID reservation already active\n");
		ret = -EALREADY;
		goto out;
	}

	ieee80211_stop_vif_queues(sdata->local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);

	synchronize_net();

	/* Tear down BA sessions so we stop aggregating on this TID */
	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
		__ieee80211_stop_tx_ba_session(sta, tid,
					       AGG_STOP_LOCAL_REQUEST);
	}

	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3163
	__ieee80211_flush_queues(local, sdata, queues, false);
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	sta->reserved_tid = tid;

	ieee80211_wake_vif_queues(local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);

	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);

	ret = 0;
 out:
	return ret;
}
EXPORT_SYMBOL(ieee80211_reserve_tid);

void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
	struct ieee80211_sub_if_data *sdata = sta->sdata;

	lockdep_assert_held(&sdata->local->sta_mtx);

	/* only some cases are supported right now */
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
		break;
	default:
		WARN_ON(1);
		return;
	}

	if (tid != sta->reserved_tid) {
		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
		return;
	}

	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
}
EXPORT_SYMBOL(ieee80211_unreserve_tid);

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void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
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{
3210
	int ac = ieee802_1d_to_ac[tid & 7];
3211

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	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3216
	skb_set_queue_mapping(skb, ac);
3217
	skb->priority = tid;
3218

3219 3220
	skb->dev = sdata->dev;

3221 3222 3223 3224 3225 3226
	/*
	 * 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();
3227 3228
	IEEE80211_SKB_CB(skb)->band = band;
	ieee80211_xmit(sdata, skb);
3229
	local_bh_enable();
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}