Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4694 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
new file mode 100644
index 000000000..3598ebe52
--- /dev/null
+++ b/net/mac80211/rx.c
@@ -0,0 +1,4694 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
+ * Copyright (C) 2018-2021 Intel Corporation
+ *
+ * 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.
+ */
+
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rcupdate.h>
+#include <linux/export.h>
+#include <linux/bitops.h>
+#include <net/mac80211.h>
+#include <net/ieee80211_radiotap.h>
+#include <asm/unaligned.h>
+
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "led.h"
+#include "mesh.h"
+#include "wep.h"
+#include "wpa.h"
+#include "tkip.h"
+#include "wme.h"
+#include "rate.h"
+
+static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
+{
+	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
+
+	u64_stats_update_begin(&tstats->syncp);
+	tstats->rx_packets++;
+	tstats->rx_bytes += len;
+	u64_stats_update_end(&tstats->syncp);
+}
+
+static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
+			       enum nl80211_iftype type)
+{
+	__le16 fc = hdr->frame_control;
+
+	if (ieee80211_is_data(fc)) {
+		if (len < 24) /* drop incorrect hdr len (data) */
+			return NULL;
+
+		if (ieee80211_has_a4(fc))
+			return NULL;
+		if (ieee80211_has_tods(fc))
+			return hdr->addr1;
+		if (ieee80211_has_fromds(fc))
+			return hdr->addr2;
+
+		return hdr->addr3;
+	}
+
+	if (ieee80211_is_mgmt(fc)) {
+		if (len < 24) /* drop incorrect hdr len (mgmt) */
+			return NULL;
+		return hdr->addr3;
+	}
+
+	if (ieee80211_is_ctl(fc)) {
+		if (ieee80211_is_pspoll(fc))
+			return hdr->addr1;
+
+		if (ieee80211_is_back_req(fc)) {
+			switch (type) {
+			case NL80211_IFTYPE_STATION:
+				return hdr->addr2;
+			case NL80211_IFTYPE_AP:
+			case NL80211_IFTYPE_AP_VLAN:
+				return hdr->addr1;
+			default:
+				break; /* fall through to the return */
+			}
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * monitor mode reception
+ *
+ * This function cleans up the SKB, i.e. it removes all the stuff
+ * only useful for monitoring.
+ */
+static void remove_monitor_info(struct sk_buff *skb,
+				unsigned int present_fcs_len,
+				unsigned int rtap_space)
+{
+	if (present_fcs_len)
+		__pskb_trim(skb, skb->len - present_fcs_len);
+	__pskb_pull(skb, rtap_space);
+}
+
+static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
+				     unsigned int rtap_space)
+{
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *hdr;
+
+	hdr = (void *)(skb->data + rtap_space);
+
+	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
+			    RX_FLAG_FAILED_PLCP_CRC |
+			    RX_FLAG_ONLY_MONITOR))
+		return true;
+
+	if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
+		return true;
+
+	if (ieee80211_is_ctl(hdr->frame_control) &&
+	    !ieee80211_is_pspoll(hdr->frame_control) &&
+	    !ieee80211_is_back_req(hdr->frame_control))
+		return true;
+
+	return false;
+}
+
+static int
+ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
+			     struct ieee80211_rx_status *status,
+			     struct sk_buff *skb)
+{
+	int len;
+
+	/* always present fields */
+	len = sizeof(struct ieee80211_radiotap_header) + 8;
+
+	/* allocate extra bitmaps */
+	if (status->chains)
+		len += 4 * hweight8(status->chains);
+	/* vendor presence bitmap */
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
+		len += 4;
+
+	if (ieee80211_have_rx_timestamp(status)) {
+		len = ALIGN(len, 8);
+		len += 8;
+	}
+	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
+		len += 1;
+
+	/* antenna field, if we don't have per-chain info */
+	if (!status->chains)
+		len += 1;
+
+	/* padding for RX_FLAGS if necessary */
+	len = ALIGN(len, 2);
+
+	if (status->encoding == RX_ENC_HT) /* HT info */
+		len += 3;
+
+	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
+		len = ALIGN(len, 4);
+		len += 8;
+	}
+
+	if (status->encoding == RX_ENC_VHT) {
+		len = ALIGN(len, 2);
+		len += 12;
+	}
+
+	if (local->hw.radiotap_timestamp.units_pos >= 0) {
+		len = ALIGN(len, 8);
+		len += 12;
+	}
+
+	if (status->encoding == RX_ENC_HE &&
+	    status->flag & RX_FLAG_RADIOTAP_HE) {
+		len = ALIGN(len, 2);
+		len += 12;
+		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
+	}
+
+	if (status->encoding == RX_ENC_HE &&
+	    status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+		len = ALIGN(len, 2);
+		len += 12;
+		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
+	}
+
+	if (status->chains) {
+		/* antenna and antenna signal fields */
+		len += 2 * hweight8(status->chains);
+	}
+
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
+		struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
+
+		/* alignment for fixed 6-byte vendor data header */
+		len = ALIGN(len, 2);
+		/* vendor data header */
+		len += 6;
+		if (WARN_ON(rtap->align == 0))
+			rtap->align = 1;
+		len = ALIGN(len, rtap->align);
+		len += rtap->len + rtap->pad;
+	}
+
+	return len;
+}
+
+static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
+					 struct sk_buff *skb,
+					 int rtap_space)
+{
+	struct {
+		struct ieee80211_hdr_3addr hdr;
+		u8 category;
+		u8 action_code;
+	} __packed __aligned(2) action;
+
+	if (!sdata)
+		return;
+
+	BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
+
+	if (skb->len < rtap_space + sizeof(action) +
+		       VHT_MUMIMO_GROUPS_DATA_LEN)
+		return;
+
+	if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
+		return;
+
+	skb_copy_bits(skb, rtap_space, &action, sizeof(action));
+
+	if (!ieee80211_is_action(action.hdr.frame_control))
+		return;
+
+	if (action.category != WLAN_CATEGORY_VHT)
+		return;
+
+	if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
+		return;
+
+	if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
+		return;
+
+	skb = skb_copy(skb, GFP_ATOMIC);
+	if (!skb)
+		return;
+
+	skb_queue_tail(&sdata->skb_queue, skb);
+	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+}
+
+/*
+ * ieee80211_add_rx_radiotap_header - add radiotap header
+ *
+ * add a radiotap header containing all the fields which the hardware provided.
+ */
+static void
+ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
+				 struct sk_buff *skb,
+				 struct ieee80211_rate *rate,
+				 int rtap_len, bool has_fcs)
+{
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_radiotap_header *rthdr;
+	unsigned char *pos;
+	__le32 *it_present;
+	u32 it_present_val;
+	u16 rx_flags = 0;
+	u16 channel_flags = 0;
+	int mpdulen, chain;
+	unsigned long chains = status->chains;
+	struct ieee80211_vendor_radiotap rtap = {};
+	struct ieee80211_radiotap_he he = {};
+	struct ieee80211_radiotap_he_mu he_mu = {};
+
+	if (status->flag & RX_FLAG_RADIOTAP_HE) {
+		he = *(struct ieee80211_radiotap_he *)skb->data;
+		skb_pull(skb, sizeof(he));
+		WARN_ON_ONCE(status->encoding != RX_ENC_HE);
+	}
+
+	if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+		he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
+		skb_pull(skb, sizeof(he_mu));
+	}
+
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
+		rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
+		/* rtap.len and rtap.pad are undone immediately */
+		skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
+	}
+
+	mpdulen = skb->len;
+	if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
+		mpdulen += FCS_LEN;
+
+	rthdr = skb_push(skb, rtap_len);
+	memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
+	it_present = &rthdr->it_present;
+
+	/* radiotap header, set always present flags */
+	rthdr->it_len = cpu_to_le16(rtap_len);
+	it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
+			 BIT(IEEE80211_RADIOTAP_CHANNEL) |
+			 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
+
+	if (!status->chains)
+		it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
+
+	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
+		it_present_val |=
+			BIT(IEEE80211_RADIOTAP_EXT) |
+			BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
+		put_unaligned_le32(it_present_val, it_present);
+		it_present++;
+		it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
+				 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
+	}
+
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
+		it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
+				  BIT(IEEE80211_RADIOTAP_EXT);
+		put_unaligned_le32(it_present_val, it_present);
+		it_present++;
+		it_present_val = rtap.present;
+	}
+
+	put_unaligned_le32(it_present_val, it_present);
+
+	pos = (void *)(it_present + 1);
+
+	/* the order of the following fields is important */
+
+	/* IEEE80211_RADIOTAP_TSFT */
+	if (ieee80211_have_rx_timestamp(status)) {
+		/* padding */
+		while ((pos - (u8 *)rthdr) & 7)
+			*pos++ = 0;
+		put_unaligned_le64(
+			ieee80211_calculate_rx_timestamp(local, status,
+							 mpdulen, 0),
+			pos);
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
+		pos += 8;
+	}
+
+	/* IEEE80211_RADIOTAP_FLAGS */
+	if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
+		*pos |= IEEE80211_RADIOTAP_F_FCS;
+	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
+		*pos |= IEEE80211_RADIOTAP_F_BADFCS;
+	if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
+		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
+	pos++;
+
+	/* IEEE80211_RADIOTAP_RATE */
+	if (!rate || status->encoding != RX_ENC_LEGACY) {
+		/*
+		 * Without rate information don't add it. If we have,
+		 * MCS information is a separate field in radiotap,
+		 * added below. The byte here is needed as padding
+		 * for the channel though, so initialise it to 0.
+		 */
+		*pos = 0;
+	} else {
+		int shift = 0;
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
+		if (status->bw == RATE_INFO_BW_10)
+			shift = 1;
+		else if (status->bw == RATE_INFO_BW_5)
+			shift = 2;
+		*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
+	}
+	pos++;
+
+	/* IEEE80211_RADIOTAP_CHANNEL */
+	put_unaligned_le16(status->freq, pos);
+	pos += 2;
+	if (status->bw == RATE_INFO_BW_10)
+		channel_flags |= IEEE80211_CHAN_HALF;
+	else if (status->bw == RATE_INFO_BW_5)
+		channel_flags |= IEEE80211_CHAN_QUARTER;
+
+	if (status->band == NL80211_BAND_5GHZ)
+		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
+	else if (status->encoding != RX_ENC_LEGACY)
+		channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
+	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
+		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
+	else if (rate)
+		channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
+	else
+		channel_flags |= IEEE80211_CHAN_2GHZ;
+	put_unaligned_le16(channel_flags, pos);
+	pos += 2;
+
+	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
+	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
+	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+		*pos = status->signal;
+		rthdr->it_present |=
+			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
+		pos++;
+	}
+
+	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
+
+	if (!status->chains) {
+		/* IEEE80211_RADIOTAP_ANTENNA */
+		*pos = status->antenna;
+		pos++;
+	}
+
+	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
+
+	/* IEEE80211_RADIOTAP_RX_FLAGS */
+	/* ensure 2 byte alignment for the 2 byte field as required */
+	if ((pos - (u8 *)rthdr) & 1)
+		*pos++ = 0;
+	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
+		rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
+	put_unaligned_le16(rx_flags, pos);
+	pos += 2;
+
+	if (status->encoding == RX_ENC_HT) {
+		unsigned int stbc;
+
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
+		*pos++ = local->hw.radiotap_mcs_details;
+		*pos = 0;
+		if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
+			*pos |= IEEE80211_RADIOTAP_MCS_SGI;
+		if (status->bw == RATE_INFO_BW_40)
+			*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
+		if (status->enc_flags & RX_ENC_FLAG_HT_GF)
+			*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
+		if (status->enc_flags & RX_ENC_FLAG_LDPC)
+			*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
+		stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
+		*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
+		pos++;
+		*pos++ = status->rate_idx;
+	}
+
+	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
+		u16 flags = 0;
+
+		/* ensure 4 byte alignment */
+		while ((pos - (u8 *)rthdr) & 3)
+			pos++;
+		rthdr->it_present |=
+			cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
+		put_unaligned_le32(status->ampdu_reference, pos);
+		pos += 4;
+		if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
+			flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
+		if (status->flag & RX_FLAG_AMPDU_IS_LAST)
+			flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
+		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
+			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
+		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
+			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
+		if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
+			flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
+		if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
+			flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
+		put_unaligned_le16(flags, pos);
+		pos += 2;
+		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
+			*pos++ = status->ampdu_delimiter_crc;
+		else
+			*pos++ = 0;
+		*pos++ = 0;
+	}
+
+	if (status->encoding == RX_ENC_VHT) {
+		u16 known = local->hw.radiotap_vht_details;
+
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
+		put_unaligned_le16(known, pos);
+		pos += 2;
+		/* flags */
+		if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
+			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
+		/* in VHT, STBC is binary */
+		if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
+			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
+		if (status->enc_flags & RX_ENC_FLAG_BF)
+			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
+		pos++;
+		/* bandwidth */
+		switch (status->bw) {
+		case RATE_INFO_BW_80:
+			*pos++ = 4;
+			break;
+		case RATE_INFO_BW_160:
+			*pos++ = 11;
+			break;
+		case RATE_INFO_BW_40:
+			*pos++ = 1;
+			break;
+		default:
+			*pos++ = 0;
+		}
+		/* MCS/NSS */
+		*pos = (status->rate_idx << 4) | status->nss;
+		pos += 4;
+		/* coding field */
+		if (status->enc_flags & RX_ENC_FLAG_LDPC)
+			*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
+		pos++;
+		/* group ID */
+		pos++;
+		/* partial_aid */
+		pos += 2;
+	}
+
+	if (local->hw.radiotap_timestamp.units_pos >= 0) {
+		u16 accuracy = 0;
+		u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
+
+		rthdr->it_present |=
+			cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
+
+		/* ensure 8 byte alignment */
+		while ((pos - (u8 *)rthdr) & 7)
+			pos++;
+
+		put_unaligned_le64(status->device_timestamp, pos);
+		pos += sizeof(u64);
+
+		if (local->hw.radiotap_timestamp.accuracy >= 0) {
+			accuracy = local->hw.radiotap_timestamp.accuracy;
+			flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
+		}
+		put_unaligned_le16(accuracy, pos);
+		pos += sizeof(u16);
+
+		*pos++ = local->hw.radiotap_timestamp.units_pos;
+		*pos++ = flags;
+	}
+
+	if (status->encoding == RX_ENC_HE &&
+	    status->flag & RX_FLAG_RADIOTAP_HE) {
+#define HE_PREP(f, val)	cpu_to_le16(FIELD_PREP(IEEE80211_RADIOTAP_HE_##f, val))
+
+		if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
+			he.data6 |= HE_PREP(DATA6_NSTS,
+					    FIELD_GET(RX_ENC_FLAG_STBC_MASK,
+						      status->enc_flags));
+			he.data3 |= HE_PREP(DATA3_STBC, 1);
+		} else {
+			he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
+		}
+
+#define CHECK_GI(s) \
+	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
+		     (int)NL80211_RATE_INFO_HE_GI_##s)
+
+		CHECK_GI(0_8);
+		CHECK_GI(1_6);
+		CHECK_GI(3_2);
+
+		he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
+		he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
+		he.data3 |= HE_PREP(DATA3_CODING,
+				    !!(status->enc_flags & RX_ENC_FLAG_LDPC));
+
+		he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
+
+		switch (status->bw) {
+		case RATE_INFO_BW_20:
+			he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+					    IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
+			break;
+		case RATE_INFO_BW_40:
+			he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+					    IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
+			break;
+		case RATE_INFO_BW_80:
+			he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+					    IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
+			break;
+		case RATE_INFO_BW_160:
+			he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+					    IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
+			break;
+		case RATE_INFO_BW_HE_RU:
+#define CHECK_RU_ALLOC(s) \
+	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
+		     NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
+
+			CHECK_RU_ALLOC(26);
+			CHECK_RU_ALLOC(52);
+			CHECK_RU_ALLOC(106);
+			CHECK_RU_ALLOC(242);
+			CHECK_RU_ALLOC(484);
+			CHECK_RU_ALLOC(996);
+			CHECK_RU_ALLOC(2x996);
+
+			he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
+					    status->he_ru + 4);
+			break;
+		default:
+			WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
+		}
+
+		/* ensure 2 byte alignment */
+		while ((pos - (u8 *)rthdr) & 1)
+			pos++;
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
+		memcpy(pos, &he, sizeof(he));
+		pos += sizeof(he);
+	}
+
+	if (status->encoding == RX_ENC_HE &&
+	    status->flag & RX_FLAG_RADIOTAP_HE_MU) {
+		/* ensure 2 byte alignment */
+		while ((pos - (u8 *)rthdr) & 1)
+			pos++;
+		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
+		memcpy(pos, &he_mu, sizeof(he_mu));
+		pos += sizeof(he_mu);
+	}
+
+	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
+		*pos++ = status->chain_signal[chain];
+		*pos++ = chain;
+	}
+
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
+		/* ensure 2 byte alignment for the vendor field as required */
+		if ((pos - (u8 *)rthdr) & 1)
+			*pos++ = 0;
+		*pos++ = rtap.oui[0];
+		*pos++ = rtap.oui[1];
+		*pos++ = rtap.oui[2];
+		*pos++ = rtap.subns;
+		put_unaligned_le16(rtap.len, pos);
+		pos += 2;
+		/* align the actual payload as requested */
+		while ((pos - (u8 *)rthdr) & (rtap.align - 1))
+			*pos++ = 0;
+		/* data (and possible padding) already follows */
+	}
+}
+
+static struct sk_buff *
+ieee80211_make_monitor_skb(struct ieee80211_local *local,
+			   struct sk_buff **origskb,
+			   struct ieee80211_rate *rate,
+			   int rtap_space, bool use_origskb)
+{
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
+	int rt_hdrlen, needed_headroom;
+	struct sk_buff *skb;
+
+	/* room for the radiotap header based on driver features */
+	rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
+	needed_headroom = rt_hdrlen - rtap_space;
+
+	if (use_origskb) {
+		/* only need to expand headroom if necessary */
+		skb = *origskb;
+		*origskb = NULL;
+
+		/*
+		 * This shouldn't trigger often because most devices have an
+		 * RX header they pull before we get here, and that should
+		 * be big enough for our radiotap information. We should
+		 * probably export the length to drivers so that we can have
+		 * them allocate enough headroom to start with.
+		 */
+		if (skb_headroom(skb) < needed_headroom &&
+		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
+			dev_kfree_skb(skb);
+			return NULL;
+		}
+	} else {
+		/*
+		 * Need to make a copy and possibly remove radiotap header
+		 * and FCS from the original.
+		 */
+		skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
+
+		if (!skb)
+			return NULL;
+	}
+
+	/* prepend radiotap information */
+	ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
+
+	skb_reset_mac_header(skb);
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+	skb->pkt_type = PACKET_OTHERHOST;
+	skb->protocol = htons(ETH_P_802_2);
+
+	return skb;
+}
+
+/*
+ * This function copies a received frame to all monitor interfaces and
+ * returns a cleaned-up SKB that no longer includes the FCS nor the
+ * radiotap header the driver might have added.
+ */
+static struct sk_buff *
+ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
+		     struct ieee80211_rate *rate)
+{
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
+	struct ieee80211_sub_if_data *sdata;
+	struct sk_buff *monskb = NULL;
+	int present_fcs_len = 0;
+	unsigned int rtap_space = 0;
+	struct ieee80211_sub_if_data *monitor_sdata =
+		rcu_dereference(local->monitor_sdata);
+	bool only_monitor = false;
+
+	if (status->flag & RX_FLAG_RADIOTAP_HE)
+		rtap_space += sizeof(struct ieee80211_radiotap_he);
+
+	if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
+		rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
+
+	if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
+		struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
+
+		rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
+	}
+
+	/*
+	 * First, we may need to make a copy of the skb because
+	 *  (1) we need to modify it for radiotap (if not present), and
+	 *  (2) the other RX handlers will modify the skb we got.
+	 *
+	 * We don't need to, of course, if we aren't going to return
+	 * the SKB because it has a bad FCS/PLCP checksum.
+	 */
+
+	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
+		if (unlikely(origskb->len <= FCS_LEN)) {
+			/* driver bug */
+			WARN_ON(1);
+			dev_kfree_skb(origskb);
+			return NULL;
+		}
+		present_fcs_len = FCS_LEN;
+	}
+
+	/* ensure hdr->frame_control and vendor radiotap data are in skb head */
+	if (!pskb_may_pull(origskb, 2 + rtap_space)) {
+		dev_kfree_skb(origskb);
+		return NULL;
+	}
+
+	only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
+
+	if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
+		if (only_monitor) {
+			dev_kfree_skb(origskb);
+			return NULL;
+		}
+
+		remove_monitor_info(origskb, present_fcs_len, rtap_space);
+		return origskb;
+	}
+
+	ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
+
+	list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
+		bool last_monitor = list_is_last(&sdata->u.mntr.list,
+						 &local->mon_list);
+
+		if (!monskb)
+			monskb = ieee80211_make_monitor_skb(local, &origskb,
+							    rate, rtap_space,
+							    only_monitor &&
+							    last_monitor);
+
+		if (monskb) {
+			struct sk_buff *skb;
+
+			if (last_monitor) {
+				skb = monskb;
+				monskb = NULL;
+			} else {
+				skb = skb_clone(monskb, GFP_ATOMIC);
+			}
+
+			if (skb) {
+				skb->dev = sdata->dev;
+				ieee80211_rx_stats(skb->dev, skb->len);
+				netif_receive_skb(skb);
+			}
+		}
+
+		if (last_monitor)
+			break;
+	}
+
+	/* this happens if last_monitor was erroneously false */
+	dev_kfree_skb(monskb);
+
+	/* ditto */
+	if (!origskb)
+		return NULL;
+
+	remove_monitor_info(origskb, present_fcs_len, rtap_space);
+	return origskb;
+}
+
+static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+	int tid, seqno_idx, security_idx;
+
+	/* does the frame have a qos control field? */
+	if (ieee80211_is_data_qos(hdr->frame_control)) {
+		u8 *qc = ieee80211_get_qos_ctl(hdr);
+		/* frame has qos control */
+		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
+		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
+			status->rx_flags |= IEEE80211_RX_AMSDU;
+
+		seqno_idx = tid;
+		security_idx = tid;
+	} else {
+		/*
+		 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
+		 *
+		 *	Sequence numbers for management frames, QoS data
+		 *	frames with a broadcast/multicast address in the
+		 *	Address 1 field, and all non-QoS data frames sent
+		 *	by QoS STAs are assigned using an additional single
+		 *	modulo-4096 counter, [...]
+		 *
+		 * We also use that counter for non-QoS STAs.
+		 */
+		seqno_idx = IEEE80211_NUM_TIDS;
+		security_idx = 0;
+		if (ieee80211_is_mgmt(hdr->frame_control))
+			security_idx = IEEE80211_NUM_TIDS;
+		tid = 0;
+	}
+
+	rx->seqno_idx = seqno_idx;
+	rx->security_idx = security_idx;
+	/* Set skb->priority to 1d tag if highest order bit of TID is not set.
+	 * For now, set skb->priority to 0 for other cases. */
+	rx->skb->priority = (tid > 7) ? 0 : tid;
+}
+
+/**
+ * DOC: Packet alignment
+ *
+ * Drivers always need to pass packets that are aligned to two-byte boundaries
+ * to the stack.
+ *
+ * Additionally, should, if possible, align the payload data in a way that
+ * guarantees that the contained IP header is aligned to a four-byte
+ * boundary. In the case of regular frames, this simply means aligning the
+ * payload to a four-byte boundary (because either the IP header is directly
+ * contained, or IV/RFC1042 headers that have a length divisible by four are
+ * in front of it).  If the payload data is not properly aligned and the
+ * architecture doesn't support efficient unaligned operations, mac80211
+ * will align the data.
+ *
+ * With A-MSDU frames, however, the payload data address must yield two modulo
+ * four because there are 14-byte 802.3 headers within the A-MSDU frames that
+ * push the IP header further back to a multiple of four again. Thankfully, the
+ * specs were sane enough this time around to require padding each A-MSDU
+ * subframe to a length that is a multiple of four.
+ *
+ * Padding like Atheros hardware adds which is between the 802.11 header and
+ * the payload is not supported, the driver is required to move the 802.11
+ * header to be directly in front of the payload in that case.
+ */
+static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
+{
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+	WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
+#endif
+}
+
+
+/* rx handlers */
+
+static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+	if (is_multicast_ether_addr(hdr->addr1))
+		return 0;
+
+	return ieee80211_is_robust_mgmt_frame(skb);
+}
+
+
+static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+	if (!is_multicast_ether_addr(hdr->addr1))
+		return 0;
+
+	return ieee80211_is_robust_mgmt_frame(skb);
+}
+
+
+/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
+static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
+{
+	struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
+	struct ieee80211_mmie *mmie;
+	struct ieee80211_mmie_16 *mmie16;
+
+	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
+		return -1;
+
+	if (!ieee80211_is_robust_mgmt_frame(skb))
+		return -1; /* not a robust management frame */
+
+	mmie = (struct ieee80211_mmie *)
+		(skb->data + skb->len - sizeof(*mmie));
+	if (mmie->element_id == WLAN_EID_MMIE &&
+	    mmie->length == sizeof(*mmie) - 2)
+		return le16_to_cpu(mmie->key_id);
+
+	mmie16 = (struct ieee80211_mmie_16 *)
+		(skb->data + skb->len - sizeof(*mmie16));
+	if (skb->len >= 24 + sizeof(*mmie16) &&
+	    mmie16->element_id == WLAN_EID_MMIE &&
+	    mmie16->length == sizeof(*mmie16) - 2)
+		return le16_to_cpu(mmie16->key_id);
+
+	return -1;
+}
+
+static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
+				  struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	__le16 fc;
+	int hdrlen;
+	u8 keyid;
+
+	fc = hdr->frame_control;
+	hdrlen = ieee80211_hdrlen(fc);
+
+	if (skb->len < hdrlen + cs->hdr_len)
+		return -EINVAL;
+
+	skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
+	keyid &= cs->key_idx_mask;
+	keyid >>= cs->key_idx_shift;
+
+	return keyid;
+}
+
+static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	char *dev_addr = rx->sdata->vif.addr;
+
+	if (ieee80211_is_data(hdr->frame_control)) {
+		if (is_multicast_ether_addr(hdr->addr1)) {
+			if (ieee80211_has_tods(hdr->frame_control) ||
+			    !ieee80211_has_fromds(hdr->frame_control))
+				return RX_DROP_MONITOR;
+			if (ether_addr_equal(hdr->addr3, dev_addr))
+				return RX_DROP_MONITOR;
+		} else {
+			if (!ieee80211_has_a4(hdr->frame_control))
+				return RX_DROP_MONITOR;
+			if (ether_addr_equal(hdr->addr4, dev_addr))
+				return RX_DROP_MONITOR;
+		}
+	}
+
+	/* If there is not an established peer link and this is not a peer link
+	 * establisment frame, beacon or probe, drop the frame.
+	 */
+
+	if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
+		struct ieee80211_mgmt *mgmt;
+
+		if (!ieee80211_is_mgmt(hdr->frame_control))
+			return RX_DROP_MONITOR;
+
+		if (ieee80211_is_action(hdr->frame_control)) {
+			u8 category;
+
+			/* make sure category field is present */
+			if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
+				return RX_DROP_MONITOR;
+
+			mgmt = (struct ieee80211_mgmt *)hdr;
+			category = mgmt->u.action.category;
+			if (category != WLAN_CATEGORY_MESH_ACTION &&
+			    category != WLAN_CATEGORY_SELF_PROTECTED)
+				return RX_DROP_MONITOR;
+			return RX_CONTINUE;
+		}
+
+		if (ieee80211_is_probe_req(hdr->frame_control) ||
+		    ieee80211_is_probe_resp(hdr->frame_control) ||
+		    ieee80211_is_beacon(hdr->frame_control) ||
+		    ieee80211_is_auth(hdr->frame_control))
+			return RX_CONTINUE;
+
+		return RX_DROP_MONITOR;
+	}
+
+	return RX_CONTINUE;
+}
+
+static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
+					      int index)
+{
+	struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
+	struct sk_buff *tail = skb_peek_tail(frames);
+	struct ieee80211_rx_status *status;
+
+	if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
+		return true;
+
+	if (!tail)
+		return false;
+
+	status = IEEE80211_SKB_RXCB(tail);
+	if (status->flag & RX_FLAG_AMSDU_MORE)
+		return false;
+
+	return true;
+}
+
+static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
+					    struct tid_ampdu_rx *tid_agg_rx,
+					    int index,
+					    struct sk_buff_head *frames)
+{
+	struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
+	struct sk_buff *skb;
+	struct ieee80211_rx_status *status;
+
+	lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+	if (skb_queue_empty(skb_list))
+		goto no_frame;
+
+	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+		__skb_queue_purge(skb_list);
+		goto no_frame;
+	}
+
+	/* release frames from the reorder ring buffer */
+	tid_agg_rx->stored_mpdu_num--;
+	while ((skb = __skb_dequeue(skb_list))) {
+		status = IEEE80211_SKB_RXCB(skb);
+		status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
+		__skb_queue_tail(frames, skb);
+	}
+
+no_frame:
+	tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
+	tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
+}
+
+static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
+					     struct tid_ampdu_rx *tid_agg_rx,
+					     u16 head_seq_num,
+					     struct sk_buff_head *frames)
+{
+	int index;
+
+	lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+	while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
+		index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
+						frames);
+	}
+}
+
+/*
+ * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
+ * the skb was added to the buffer longer than this time ago, the earlier
+ * frames that have not yet been received are assumed to be lost and the skb
+ * can be released for processing. This may also release other skb's from the
+ * reorder buffer if there are no additional gaps between the frames.
+ *
+ * Callers must hold tid_agg_rx->reorder_lock.
+ */
+#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
+
+static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
+					  struct tid_ampdu_rx *tid_agg_rx,
+					  struct sk_buff_head *frames)
+{
+	int index, i, j;
+
+	lockdep_assert_held(&tid_agg_rx->reorder_lock);
+
+	/* release the buffer until next missing frame */
+	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
+	    tid_agg_rx->stored_mpdu_num) {
+		/*
+		 * No buffers ready to be released, but check whether any
+		 * frames in the reorder buffer have timed out.
+		 */
+		int skipped = 1;
+		for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
+		     j = (j + 1) % tid_agg_rx->buf_size) {
+			if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
+				skipped++;
+				continue;
+			}
+			if (skipped &&
+			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
+					HT_RX_REORDER_BUF_TIMEOUT))
+				goto set_release_timer;
+
+			/* don't leave incomplete A-MSDUs around */
+			for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
+			     i = (i + 1) % tid_agg_rx->buf_size)
+				__skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
+
+			ht_dbg_ratelimited(sdata,
+					   "release an RX reorder frame due to timeout on earlier frames\n");
+			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
+							frames);
+
+			/*
+			 * Increment the head seq# also for the skipped slots.
+			 */
+			tid_agg_rx->head_seq_num =
+				(tid_agg_rx->head_seq_num +
+				 skipped) & IEEE80211_SN_MASK;
+			skipped = 0;
+		}
+	} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
+						frames);
+		index =	tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+	}
+
+	if (tid_agg_rx->stored_mpdu_num) {
+		j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
+
+		for (; j != (index - 1) % tid_agg_rx->buf_size;
+		     j = (j + 1) % tid_agg_rx->buf_size) {
+			if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
+				break;
+		}
+
+ set_release_timer:
+
+		if (!tid_agg_rx->removed)
+			mod_timer(&tid_agg_rx->reorder_timer,
+				  tid_agg_rx->reorder_time[j] + 1 +
+				  HT_RX_REORDER_BUF_TIMEOUT);
+	} else {
+		del_timer(&tid_agg_rx->reorder_timer);
+	}
+}
+
+/*
+ * As this function belongs to the RX path it must be under
+ * rcu_read_lock protection. It returns false if the frame
+ * can be processed immediately, true if it was consumed.
+ */
+static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
+					     struct tid_ampdu_rx *tid_agg_rx,
+					     struct sk_buff *skb,
+					     struct sk_buff_head *frames)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	u16 sc = le16_to_cpu(hdr->seq_ctrl);
+	u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
+	u16 head_seq_num, buf_size;
+	int index;
+	bool ret = true;
+
+	spin_lock(&tid_agg_rx->reorder_lock);
+
+	/*
+	 * Offloaded BA sessions have no known starting sequence number so pick
+	 * one from first Rxed frame for this tid after BA was started.
+	 */
+	if (unlikely(tid_agg_rx->auto_seq)) {
+		tid_agg_rx->auto_seq = false;
+		tid_agg_rx->ssn = mpdu_seq_num;
+		tid_agg_rx->head_seq_num = mpdu_seq_num;
+	}
+
+	buf_size = tid_agg_rx->buf_size;
+	head_seq_num = tid_agg_rx->head_seq_num;
+
+	/*
+	 * If the current MPDU's SN is smaller than the SSN, it shouldn't
+	 * be reordered.
+	 */
+	if (unlikely(!tid_agg_rx->started)) {
+		if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
+			ret = false;
+			goto out;
+		}
+		tid_agg_rx->started = true;
+	}
+
+	/* frame with out of date sequence number */
+	if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
+		dev_kfree_skb(skb);
+		goto out;
+	}
+
+	/*
+	 * If frame the sequence number exceeds our buffering window
+	 * size release some previous frames to make room for this one.
+	 */
+	if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
+		head_seq_num = ieee80211_sn_inc(
+				ieee80211_sn_sub(mpdu_seq_num, buf_size));
+		/* release stored frames up to new head to stack */
+		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
+						 head_seq_num, frames);
+	}
+
+	/* Now the new frame is always in the range of the reordering buffer */
+
+	index = mpdu_seq_num % tid_agg_rx->buf_size;
+
+	/* check if we already stored this frame */
+	if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
+		dev_kfree_skb(skb);
+		goto out;
+	}
+
+	/*
+	 * If the current MPDU is in the right order and nothing else
+	 * is stored we can process it directly, no need to buffer it.
+	 * If it is first but there's something stored, we may be able
+	 * to release frames after this one.
+	 */
+	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
+	    tid_agg_rx->stored_mpdu_num == 0) {
+		if (!(status->flag & RX_FLAG_AMSDU_MORE))
+			tid_agg_rx->head_seq_num =
+				ieee80211_sn_inc(tid_agg_rx->head_seq_num);
+		ret = false;
+		goto out;
+	}
+
+	/* put the frame in the reordering buffer */
+	__skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
+	if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
+		tid_agg_rx->reorder_time[index] = jiffies;
+		tid_agg_rx->stored_mpdu_num++;
+		ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
+	}
+
+ out:
+	spin_unlock(&tid_agg_rx->reorder_lock);
+	return ret;
+}
+
+/*
+ * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
+ * true if the MPDU was buffered, false if it should be processed.
+ */
+static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
+				       struct sk_buff_head *frames)
+{
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_local *local = rx->local;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	struct sta_info *sta = rx->sta;
+	struct tid_ampdu_rx *tid_agg_rx;
+	u16 sc;
+	u8 tid, ack_policy;
+
+	if (!ieee80211_is_data_qos(hdr->frame_control) ||
+	    is_multicast_ether_addr(hdr->addr1))
+		goto dont_reorder;
+
+	/*
+	 * filter the QoS data rx stream according to
+	 * STA/TID and check if this STA/TID is on aggregation
+	 */
+
+	if (!sta)
+		goto dont_reorder;
+
+	ack_policy = *ieee80211_get_qos_ctl(hdr) &
+		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
+	tid = ieee80211_get_tid(hdr);
+
+	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+	if (!tid_agg_rx) {
+		if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
+		    !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
+		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
+			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
+					     WLAN_BACK_RECIPIENT,
+					     WLAN_REASON_QSTA_REQUIRE_SETUP);
+		goto dont_reorder;
+	}
+
+	/* qos null data frames are excluded */
+	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
+		goto dont_reorder;
+
+	/* not part of a BA session */
+	if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
+		goto dont_reorder;
+
+	/* new, potentially un-ordered, ampdu frame - process it */
+
+	/* reset session timer */
+	if (tid_agg_rx->timeout)
+		tid_agg_rx->last_rx = jiffies;
+
+	/* if this mpdu is fragmented - terminate rx aggregation session */
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	if (sc & IEEE80211_SCTL_FRAG) {
+		skb_queue_tail(&rx->sdata->skb_queue, skb);
+		ieee80211_queue_work(&local->hw, &rx->sdata->work);
+		return;
+	}
+
+	/*
+	 * No locking needed -- we will only ever process one
+	 * RX packet at a time, and thus own tid_agg_rx. All
+	 * other code manipulating it needs to (and does) make
+	 * sure that we cannot get to it any more before doing
+	 * anything with it.
+	 */
+	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
+					     frames))
+		return;
+
+ dont_reorder:
+	__skb_queue_tail(frames, skb);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+	if (status->flag & RX_FLAG_DUP_VALIDATED)
+		return RX_CONTINUE;
+
+	/*
+	 * Drop duplicate 802.11 retransmissions
+	 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
+	 */
+
+	if (rx->skb->len < 24)
+		return RX_CONTINUE;
+
+	if (ieee80211_is_ctl(hdr->frame_control) ||
+	    ieee80211_is_any_nullfunc(hdr->frame_control) ||
+	    is_multicast_ether_addr(hdr->addr1))
+		return RX_CONTINUE;
+
+	if (!rx->sta)
+		return RX_CONTINUE;
+
+	if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
+		     rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
+		I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
+		rx->sta->rx_stats.num_duplicates++;
+		return RX_DROP_UNUSABLE;
+	} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
+		rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
+	}
+
+	return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+
+	/* Drop disallowed frame classes based on STA auth/assoc state;
+	 * IEEE 802.11, Chap 5.5.
+	 *
+	 * mac80211 filters only based on association state, i.e. it drops
+	 * Class 3 frames from not associated stations. hostapd sends
+	 * deauth/disassoc frames when needed. In addition, hostapd is
+	 * responsible for filtering on both auth and assoc states.
+	 */
+
+	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
+		return ieee80211_rx_mesh_check(rx);
+
+	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
+		      ieee80211_is_pspoll(hdr->frame_control)) &&
+		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
+		     rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
+		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
+		/*
+		 * accept port control frames from the AP even when it's not
+		 * yet marked ASSOC to prevent a race where we don't set the
+		 * assoc bit quickly enough before it sends the first frame
+		 */
+		if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
+		    ieee80211_is_data_present(hdr->frame_control)) {
+			unsigned int hdrlen;
+			__be16 ethertype;
+
+			hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+			if (rx->skb->len < hdrlen + 8)
+				return RX_DROP_MONITOR;
+
+			skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
+			if (ethertype == rx->sdata->control_port_protocol)
+				return RX_CONTINUE;
+		}
+
+		if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
+		    cfg80211_rx_spurious_frame(rx->sdata->dev,
+					       hdr->addr2,
+					       GFP_ATOMIC))
+			return RX_DROP_UNUSABLE;
+
+		return RX_DROP_MONITOR;
+	}
+
+	return RX_CONTINUE;
+}
+
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_local *local;
+	struct ieee80211_hdr *hdr;
+	struct sk_buff *skb;
+
+	local = rx->local;
+	skb = rx->skb;
+	hdr = (struct ieee80211_hdr *) skb->data;
+
+	if (!local->pspolling)
+		return RX_CONTINUE;
+
+	if (!ieee80211_has_fromds(hdr->frame_control))
+		/* this is not from AP */
+		return RX_CONTINUE;
+
+	if (!ieee80211_is_data(hdr->frame_control))
+		return RX_CONTINUE;
+
+	if (!ieee80211_has_moredata(hdr->frame_control)) {
+		/* AP has no more frames buffered for us */
+		local->pspolling = false;
+		return RX_CONTINUE;
+	}
+
+	/* more data bit is set, let's request a new frame from the AP */
+	ieee80211_send_pspoll(local, rx->sdata);
+
+	return RX_CONTINUE;
+}
+
+static void sta_ps_start(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct ps_data *ps;
+	int tid;
+
+	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
+	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+		ps = &sdata->bss->ps;
+	else
+		return;
+
+	atomic_inc(&ps->num_sta_ps);
+	set_sta_flag(sta, WLAN_STA_PS_STA);
+	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
+		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
+	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
+	       sta->sta.addr, sta->sta.aid);
+
+	ieee80211_clear_fast_xmit(sta);
+
+	if (!sta->sta.txq[0])
+		return;
+
+	for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
+		if (txq_has_queue(sta->sta.txq[tid]))
+			set_bit(tid, &sta->txq_buffered_tids);
+		else
+			clear_bit(tid, &sta->txq_buffered_tids);
+	}
+}
+
+static void sta_ps_end(struct sta_info *sta)
+{
+	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
+	       sta->sta.addr, sta->sta.aid);
+
+	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
+		/*
+		 * Clear the flag only if the other one is still set
+		 * so that the TX path won't start TX'ing new frames
+		 * directly ... In the case that the driver flag isn't
+		 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
+		 */
+		clear_sta_flag(sta, WLAN_STA_PS_STA);
+		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
+		       sta->sta.addr, sta->sta.aid);
+		return;
+	}
+
+	set_sta_flag(sta, WLAN_STA_PS_DELIVER);
+	clear_sta_flag(sta, WLAN_STA_PS_STA);
+	ieee80211_sta_ps_deliver_wakeup(sta);
+}
+
+int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+	bool in_ps;
+
+	WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
+
+	/* Don't let the same PS state be set twice */
+	in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
+	if ((start && in_ps) || (!start && !in_ps))
+		return -EINVAL;
+
+	if (start)
+		sta_ps_start(sta);
+	else
+		sta_ps_end(sta);
+
+	return 0;
+}
+EXPORT_SYMBOL(ieee80211_sta_ps_transition);
+
+void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+	if (test_sta_flag(sta, WLAN_STA_SP))
+		return;
+
+	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
+		ieee80211_sta_ps_deliver_poll_response(sta);
+	else
+		set_sta_flag(sta, WLAN_STA_PSPOLL);
+}
+EXPORT_SYMBOL(ieee80211_sta_pspoll);
+
+void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+	int ac = ieee80211_ac_from_tid(tid);
+
+	/*
+	 * If this AC is not trigger-enabled do nothing unless the
+	 * driver is calling us after it already checked.
+	 *
+	 * NB: This could/should check a separate bitmap of trigger-
+	 * enabled queues, but for now we only implement uAPSD w/o
+	 * TSPEC changes to the ACs, so they're always the same.
+	 */
+	if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
+	    tid != IEEE80211_NUM_TIDS)
+		return;
+
+	/* if we are in a service period, do nothing */
+	if (test_sta_flag(sta, WLAN_STA_SP))
+		return;
+
+	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
+		ieee80211_sta_ps_deliver_uapsd(sta);
+	else
+		set_sta_flag(sta, WLAN_STA_UAPSD);
+}
+EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+	if (!rx->sta)
+		return RX_CONTINUE;
+
+	if (sdata->vif.type != NL80211_IFTYPE_AP &&
+	    sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
+		return RX_CONTINUE;
+
+	/*
+	 * The device handles station powersave, so don't do anything about
+	 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
+	 * it to mac80211 since they're handled.)
+	 */
+	if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
+		return RX_CONTINUE;
+
+	/*
+	 * Don't do anything if the station isn't already asleep. In
+	 * the uAPSD case, the station will probably be marked asleep,
+	 * in the PS-Poll case the station must be confused ...
+	 */
+	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
+		return RX_CONTINUE;
+
+	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
+		ieee80211_sta_pspoll(&rx->sta->sta);
+
+		/* Free PS Poll skb here instead of returning RX_DROP that would
+		 * count as an dropped frame. */
+		dev_kfree_skb(rx->skb);
+
+		return RX_QUEUED;
+	} else if (!ieee80211_has_morefrags(hdr->frame_control) &&
+		   !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
+		   ieee80211_has_pm(hdr->frame_control) &&
+		   (ieee80211_is_data_qos(hdr->frame_control) ||
+		    ieee80211_is_qos_nullfunc(hdr->frame_control))) {
+		u8 tid = ieee80211_get_tid(hdr);
+
+		ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
+	}
+
+	return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
+{
+	struct sta_info *sta = rx->sta;
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	int i;
+
+	if (!sta)
+		return RX_CONTINUE;
+
+	/*
+	 * Update last_rx only for IBSS packets which are for the current
+	 * BSSID and for station already AUTHORIZED to avoid keeping the
+	 * current IBSS network alive in cases where other STAs start
+	 * using different BSSID. This will also give the station another
+	 * chance to restart the authentication/authorization in case
+	 * something went wrong the first time.
+	 */
+	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
+						NL80211_IFTYPE_ADHOC);
+		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
+		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
+			sta->rx_stats.last_rx = jiffies;
+			if (ieee80211_is_data(hdr->frame_control) &&
+			    !is_multicast_ether_addr(hdr->addr1))
+				sta->rx_stats.last_rate =
+					sta_stats_encode_rate(status);
+		}
+	} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
+		sta->rx_stats.last_rx = jiffies;
+	} else if (!is_multicast_ether_addr(hdr->addr1)) {
+		/*
+		 * Mesh beacons will update last_rx when if they are found to
+		 * match the current local configuration when processed.
+		 */
+		sta->rx_stats.last_rx = jiffies;
+		if (ieee80211_is_data(hdr->frame_control))
+			sta->rx_stats.last_rate = sta_stats_encode_rate(status);
+	}
+
+	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
+		ieee80211_sta_rx_notify(rx->sdata, hdr);
+
+	sta->rx_stats.fragments++;
+
+	u64_stats_update_begin(&rx->sta->rx_stats.syncp);
+	sta->rx_stats.bytes += rx->skb->len;
+	u64_stats_update_end(&rx->sta->rx_stats.syncp);
+
+	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+		sta->rx_stats.last_signal = status->signal;
+		ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
+	}
+
+	if (status->chains) {
+		sta->rx_stats.chains = status->chains;
+		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
+			int signal = status->chain_signal[i];
+
+			if (!(status->chains & BIT(i)))
+				continue;
+
+			sta->rx_stats.chain_signal_last[i] = signal;
+			ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
+					-signal);
+		}
+	}
+
+	/*
+	 * Change STA power saving mode only at the end of a frame
+	 * exchange sequence, and only for a data or management
+	 * frame as specified in IEEE 802.11-2016 11.2.3.2
+	 */
+	if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
+	    !ieee80211_has_morefrags(hdr->frame_control) &&
+	    !is_multicast_ether_addr(hdr->addr1) &&
+	    (ieee80211_is_mgmt(hdr->frame_control) ||
+	     ieee80211_is_data(hdr->frame_control)) &&
+	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
+	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
+	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
+		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
+			if (!ieee80211_has_pm(hdr->frame_control))
+				sta_ps_end(sta);
+		} else {
+			if (ieee80211_has_pm(hdr->frame_control))
+				sta_ps_start(sta);
+		}
+	}
+
+	/* mesh power save support */
+	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
+		ieee80211_mps_rx_h_sta_process(sta, hdr);
+
+	/*
+	 * Drop (qos-)data::nullfunc frames silently, since they
+	 * are used only to control station power saving mode.
+	 */
+	if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
+		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
+
+		/*
+		 * If we receive a 4-addr nullfunc frame from a STA
+		 * that was not moved to a 4-addr STA vlan yet send
+		 * the event to userspace and for older hostapd drop
+		 * the frame to the monitor interface.
+		 */
+		if (ieee80211_has_a4(hdr->frame_control) &&
+		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
+		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+		      !rx->sdata->u.vlan.sta))) {
+			if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
+				cfg80211_rx_unexpected_4addr_frame(
+					rx->sdata->dev, sta->sta.addr,
+					GFP_ATOMIC);
+			return RX_DROP_MONITOR;
+		}
+		/*
+		 * Update counter and free packet here to avoid
+		 * counting this as a dropped packed.
+		 */
+		sta->rx_stats.packets++;
+		dev_kfree_skb(rx->skb);
+		return RX_QUEUED;
+	}
+
+	return RX_CONTINUE;
+} /* ieee80211_rx_h_sta_process */
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
+{
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	int keyidx;
+	int hdrlen;
+	ieee80211_rx_result result = RX_DROP_UNUSABLE;
+	struct ieee80211_key *sta_ptk = NULL;
+	int mmie_keyidx = -1;
+	__le16 fc;
+	const struct ieee80211_cipher_scheme *cs = NULL;
+
+	/*
+	 * Key selection 101
+	 *
+	 * There are four types of keys:
+	 *  - GTK (group keys)
+	 *  - IGTK (group keys for management frames)
+	 *  - PTK (pairwise keys)
+	 *  - STK (station-to-station pairwise keys)
+	 *
+	 * When selecting a key, we have to distinguish between multicast
+	 * (including broadcast) and unicast frames, the latter can only
+	 * use PTKs and STKs while the former always use GTKs and IGTKs.
+	 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
+	 * unicast frames can also use key indices like GTKs. Hence, if we
+	 * don't have a PTK/STK we check the key index for a WEP key.
+	 *
+	 * Note that in a regular BSS, multicast frames are sent by the
+	 * AP only, associated stations unicast the frame to the AP first
+	 * which then multicasts it on their behalf.
+	 *
+	 * There is also a slight problem in IBSS mode: GTKs are negotiated
+	 * with each station, that is something we don't currently handle.
+	 * The spec seems to expect that one negotiates the same key with
+	 * every station but there's no such requirement; VLANs could be
+	 * possible.
+	 */
+
+	/* start without a key */
+	rx->key = NULL;
+	fc = hdr->frame_control;
+
+	if (rx->sta) {
+		int keyid = rx->sta->ptk_idx;
+
+		if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
+			cs = rx->sta->cipher_scheme;
+			keyid = ieee80211_get_cs_keyid(cs, rx->skb);
+			if (unlikely(keyid < 0))
+				return RX_DROP_UNUSABLE;
+		}
+		sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
+	}
+
+	if (!ieee80211_has_protected(fc))
+		mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
+
+	if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
+		rx->key = sta_ptk;
+		if ((status->flag & RX_FLAG_DECRYPTED) &&
+		    (status->flag & RX_FLAG_IV_STRIPPED))
+			return RX_CONTINUE;
+		/* Skip decryption if the frame is not protected. */
+		if (!ieee80211_has_protected(fc))
+			return RX_CONTINUE;
+	} else if (mmie_keyidx >= 0) {
+		/* Broadcast/multicast robust management frame / BIP */
+		if ((status->flag & RX_FLAG_DECRYPTED) &&
+		    (status->flag & RX_FLAG_IV_STRIPPED))
+			return RX_CONTINUE;
+
+		if (mmie_keyidx < NUM_DEFAULT_KEYS ||
+		    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
+			return RX_DROP_MONITOR; /* unexpected BIP keyidx */
+		if (rx->sta) {
+			if (ieee80211_is_group_privacy_action(skb) &&
+			    test_sta_flag(rx->sta, WLAN_STA_MFP))
+				return RX_DROP_MONITOR;
+
+			rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
+		}
+		if (!rx->key)
+			rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
+	} else if (!ieee80211_has_protected(fc)) {
+		/*
+		 * The frame was not protected, so skip decryption. However, we
+		 * need to set rx->key if there is a key that could have been
+		 * used so that the frame may be dropped if encryption would
+		 * have been expected.
+		 */
+		struct ieee80211_key *key = NULL;
+		struct ieee80211_sub_if_data *sdata = rx->sdata;
+		int i;
+
+		if (ieee80211_is_mgmt(fc) &&
+		    is_multicast_ether_addr(hdr->addr1) &&
+		    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
+			rx->key = key;
+		else {
+			if (rx->sta) {
+				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+					key = rcu_dereference(rx->sta->gtk[i]);
+					if (key)
+						break;
+				}
+			}
+			if (!key) {
+				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+					key = rcu_dereference(sdata->keys[i]);
+					if (key)
+						break;
+				}
+			}
+			if (key)
+				rx->key = key;
+		}
+		return RX_CONTINUE;
+	} else {
+		u8 keyid;
+
+		/*
+		 * The device doesn't give us the IV so we won't be
+		 * able to look up the key. That's ok though, we
+		 * don't need to decrypt the frame, we just won't
+		 * be able to keep statistics accurate.
+		 * Except for key threshold notifications, should
+		 * we somehow allow the driver to tell us which key
+		 * the hardware used if this flag is set?
+		 */
+		if ((status->flag & RX_FLAG_DECRYPTED) &&
+		    (status->flag & RX_FLAG_IV_STRIPPED))
+			return RX_CONTINUE;
+
+		hdrlen = ieee80211_hdrlen(fc);
+
+		if (cs) {
+			keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
+
+			if (unlikely(keyidx < 0))
+				return RX_DROP_UNUSABLE;
+		} else {
+			if (rx->skb->len < 8 + hdrlen)
+				return RX_DROP_UNUSABLE; /* TODO: count this? */
+			/*
+			 * no need to call ieee80211_wep_get_keyidx,
+			 * it verifies a bunch of things we've done already
+			 */
+			skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
+			keyidx = keyid >> 6;
+		}
+
+		/* check per-station GTK first, if multicast packet */
+		if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
+			rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
+
+		/* if not found, try default key */
+		if (!rx->key) {
+			rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
+
+			/*
+			 * RSNA-protected unicast frames should always be
+			 * sent with pairwise or station-to-station keys,
+			 * but for WEP we allow using a key index as well.
+			 */
+			if (rx->key &&
+			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
+			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
+			    !is_multicast_ether_addr(hdr->addr1))
+				rx->key = NULL;
+		}
+	}
+
+	if (rx->key) {
+		if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
+			return RX_DROP_MONITOR;
+
+		/* TODO: add threshold stuff again */
+	} else {
+		return RX_DROP_MONITOR;
+	}
+
+	switch (rx->key->conf.cipher) {
+	case WLAN_CIPHER_SUITE_WEP40:
+	case WLAN_CIPHER_SUITE_WEP104:
+		result = ieee80211_crypto_wep_decrypt(rx);
+		break;
+	case WLAN_CIPHER_SUITE_TKIP:
+		result = ieee80211_crypto_tkip_decrypt(rx);
+		break;
+	case WLAN_CIPHER_SUITE_CCMP:
+		result = ieee80211_crypto_ccmp_decrypt(
+			rx, IEEE80211_CCMP_MIC_LEN);
+		break;
+	case WLAN_CIPHER_SUITE_CCMP_256:
+		result = ieee80211_crypto_ccmp_decrypt(
+			rx, IEEE80211_CCMP_256_MIC_LEN);
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+		result = ieee80211_crypto_aes_cmac_decrypt(rx);
+		break;
+	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+		result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
+		break;
+	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+		result = ieee80211_crypto_aes_gmac_decrypt(rx);
+		break;
+	case WLAN_CIPHER_SUITE_GCMP:
+	case WLAN_CIPHER_SUITE_GCMP_256:
+		result = ieee80211_crypto_gcmp_decrypt(rx);
+		break;
+	default:
+		result = ieee80211_crypto_hw_decrypt(rx);
+	}
+
+	/* the hdr variable is invalid after the decrypt handlers */
+
+	/* either the frame has been decrypted or will be dropped */
+	status->flag |= RX_FLAG_DECRYPTED;
+
+	return result;
+}
+
+void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
+		skb_queue_head_init(&cache->entries[i].skb_list);
+}
+
+void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
+		__skb_queue_purge(&cache->entries[i].skb_list);
+}
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
+			 unsigned int frag, unsigned int seq, int rx_queue,
+			 struct sk_buff **skb)
+{
+	struct ieee80211_fragment_entry *entry;
+
+	entry = &cache->entries[cache->next++];
+	if (cache->next >= IEEE80211_FRAGMENT_MAX)
+		cache->next = 0;
+
+	__skb_queue_purge(&entry->skb_list);
+
+	__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
+	*skb = NULL;
+	entry->first_frag_time = jiffies;
+	entry->seq = seq;
+	entry->rx_queue = rx_queue;
+	entry->last_frag = frag;
+	entry->check_sequential_pn = false;
+	entry->extra_len = 0;
+
+	return entry;
+}
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
+			  unsigned int frag, unsigned int seq,
+			  int rx_queue, struct ieee80211_hdr *hdr)
+{
+	struct ieee80211_fragment_entry *entry;
+	int i, idx;
+
+	idx = cache->next;
+	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
+		struct ieee80211_hdr *f_hdr;
+
+		idx--;
+		if (idx < 0)
+			idx = IEEE80211_FRAGMENT_MAX - 1;
+
+		entry = &cache->entries[idx];
+		if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
+		    entry->rx_queue != rx_queue ||
+		    entry->last_frag + 1 != frag)
+			continue;
+
+		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
+
+		/*
+		 * Check ftype and addresses are equal, else check next fragment
+		 */
+		if (((hdr->frame_control ^ f_hdr->frame_control) &
+		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
+		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
+		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
+			continue;
+
+		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
+			__skb_queue_purge(&entry->skb_list);
+			continue;
+		}
+		return entry;
+	}
+
+	return NULL;
+}
+
+static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
+{
+	return rx->key &&
+		(rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
+		 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
+		 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
+		 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
+		ieee80211_has_protected(fc);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
+	struct ieee80211_hdr *hdr;
+	u16 sc;
+	__le16 fc;
+	unsigned int frag, seq;
+	struct ieee80211_fragment_entry *entry;
+	struct sk_buff *skb;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+	hdr = (struct ieee80211_hdr *)rx->skb->data;
+	fc = hdr->frame_control;
+
+	if (ieee80211_is_ctl(fc))
+		return RX_CONTINUE;
+
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	frag = sc & IEEE80211_SCTL_FRAG;
+
+	if (rx->sta)
+		cache = &rx->sta->frags;
+
+	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
+		goto out;
+
+	if (is_multicast_ether_addr(hdr->addr1))
+		return RX_DROP_MONITOR;
+
+	I802_DEBUG_INC(rx->local->rx_handlers_fragments);
+
+	if (skb_linearize(rx->skb))
+		return RX_DROP_UNUSABLE;
+
+	/*
+	 *  skb_linearize() might change the skb->data and
+	 *  previously cached variables (in this case, hdr) need to
+	 *  be refreshed with the new data.
+	 */
+	hdr = (struct ieee80211_hdr *)rx->skb->data;
+	seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
+
+	if (frag == 0) {
+		/* This is the first fragment of a new frame. */
+		entry = ieee80211_reassemble_add(cache, frag, seq,
+						 rx->seqno_idx, &(rx->skb));
+		if (requires_sequential_pn(rx, fc)) {
+			int queue = rx->security_idx;
+
+			/* Store CCMP/GCMP PN so that we can verify that the
+			 * next fragment has a sequential PN value.
+			 */
+			entry->check_sequential_pn = true;
+			entry->is_protected = true;
+			entry->key_color = rx->key->color;
+			memcpy(entry->last_pn,
+			       rx->key->u.ccmp.rx_pn[queue],
+			       IEEE80211_CCMP_PN_LEN);
+			BUILD_BUG_ON(offsetof(struct ieee80211_key,
+					      u.ccmp.rx_pn) !=
+				     offsetof(struct ieee80211_key,
+					      u.gcmp.rx_pn));
+			BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
+				     sizeof(rx->key->u.gcmp.rx_pn[queue]));
+			BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
+				     IEEE80211_GCMP_PN_LEN);
+		} else if (rx->key &&
+			   (ieee80211_has_protected(fc) ||
+			    (status->flag & RX_FLAG_DECRYPTED))) {
+			entry->is_protected = true;
+			entry->key_color = rx->key->color;
+		}
+		return RX_QUEUED;
+	}
+
+	/* This is a fragment for a frame that should already be pending in
+	 * fragment cache. Add this fragment to the end of the pending entry.
+	 */
+	entry = ieee80211_reassemble_find(cache, frag, seq,
+					  rx->seqno_idx, hdr);
+	if (!entry) {
+		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+		return RX_DROP_MONITOR;
+	}
+
+	/* "The receiver shall discard MSDUs and MMPDUs whose constituent
+	 *  MPDU PN values are not incrementing in steps of 1."
+	 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
+	 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
+	 */
+	if (entry->check_sequential_pn) {
+		int i;
+		u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
+
+		if (!requires_sequential_pn(rx, fc))
+			return RX_DROP_UNUSABLE;
+
+		/* Prevent mixed key and fragment cache attacks */
+		if (entry->key_color != rx->key->color)
+			return RX_DROP_UNUSABLE;
+
+		memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
+		for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
+			pn[i]++;
+			if (pn[i])
+				break;
+		}
+
+		rpn = rx->ccm_gcm.pn;
+		if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
+			return RX_DROP_UNUSABLE;
+		memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
+	} else if (entry->is_protected &&
+		   (!rx->key ||
+		    (!ieee80211_has_protected(fc) &&
+		     !(status->flag & RX_FLAG_DECRYPTED)) ||
+		    rx->key->color != entry->key_color)) {
+		/* Drop this as a mixed key or fragment cache attack, even
+		 * if for TKIP Michael MIC should protect us, and WEP is a
+		 * lost cause anyway.
+		 */
+		return RX_DROP_UNUSABLE;
+	} else if (entry->is_protected && rx->key &&
+		   entry->key_color != rx->key->color &&
+		   (status->flag & RX_FLAG_DECRYPTED)) {
+		return RX_DROP_UNUSABLE;
+	}
+
+	skb_pull(rx->skb, ieee80211_hdrlen(fc));
+	__skb_queue_tail(&entry->skb_list, rx->skb);
+	entry->last_frag = frag;
+	entry->extra_len += rx->skb->len;
+	if (ieee80211_has_morefrags(fc)) {
+		rx->skb = NULL;
+		return RX_QUEUED;
+	}
+
+	rx->skb = __skb_dequeue(&entry->skb_list);
+	if (skb_tailroom(rx->skb) < entry->extra_len) {
+		I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
+		if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
+					      GFP_ATOMIC))) {
+			I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+			__skb_queue_purge(&entry->skb_list);
+			return RX_DROP_UNUSABLE;
+		}
+	}
+	while ((skb = __skb_dequeue(&entry->skb_list))) {
+		skb_put_data(rx->skb, skb->data, skb->len);
+		dev_kfree_skb(skb);
+	}
+
+ out:
+	ieee80211_led_rx(rx->local);
+	if (rx->sta)
+		rx->sta->rx_stats.packets++;
+	return RX_CONTINUE;
+}
+
+static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
+{
+	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
+		return -EACCES;
+
+	return 0;
+}
+
+static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
+{
+	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+
+	/*
+	 * Pass through unencrypted frames if the hardware has
+	 * decrypted them already.
+	 */
+	if (status->flag & RX_FLAG_DECRYPTED)
+		return 0;
+
+	/* check mesh EAPOL frames first */
+	if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
+		     ieee80211_is_data(fc))) {
+		struct ieee80211s_hdr *mesh_hdr;
+		u16 hdr_len = ieee80211_hdrlen(fc);
+		u16 ethertype_offset;
+		__be16 ethertype;
+
+		if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
+			goto drop_check;
+
+		/* make sure fixed part of mesh header is there, also checks skb len */
+		if (!pskb_may_pull(rx->skb, hdr_len + 6))
+			goto drop_check;
+
+		mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
+		ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
+				   sizeof(rfc1042_header);
+
+		if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
+		    ethertype == rx->sdata->control_port_protocol)
+			return 0;
+	}
+
+drop_check:
+	/* Drop unencrypted frames if key is set. */
+	if (unlikely(!ieee80211_has_protected(fc) &&
+		     !ieee80211_is_any_nullfunc(fc) &&
+		     ieee80211_is_data(fc) && rx->key))
+		return -EACCES;
+
+	return 0;
+}
+
+static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+	__le16 fc = hdr->frame_control;
+
+	/*
+	 * Pass through unencrypted frames if the hardware has
+	 * decrypted them already.
+	 */
+	if (status->flag & RX_FLAG_DECRYPTED)
+		return 0;
+
+	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
+		if (unlikely(!ieee80211_has_protected(fc) &&
+			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
+			     rx->key)) {
+			if (ieee80211_is_deauth(fc) ||
+			    ieee80211_is_disassoc(fc))
+				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+							     rx->skb->data,
+							     rx->skb->len);
+			return -EACCES;
+		}
+		/* BIP does not use Protected field, so need to check MMIE */
+		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
+			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
+			if (ieee80211_is_deauth(fc) ||
+			    ieee80211_is_disassoc(fc))
+				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+							     rx->skb->data,
+							     rx->skb->len);
+			return -EACCES;
+		}
+		/*
+		 * When using MFP, Action frames are not allowed prior to
+		 * having configured keys.
+		 */
+		if (unlikely(ieee80211_is_action(fc) && !rx->key &&
+			     ieee80211_is_robust_mgmt_frame(rx->skb)))
+			return -EACCES;
+	}
+
+	return 0;
+}
+
+static int
+__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	bool check_port_control = false;
+	struct ethhdr *ehdr;
+	int ret;
+
+	*port_control = false;
+	if (ieee80211_has_a4(hdr->frame_control) &&
+	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
+		return -1;
+
+	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+	    !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
+
+		if (!sdata->u.mgd.use_4addr)
+			return -1;
+		else
+			check_port_control = true;
+	}
+
+	if (is_multicast_ether_addr(hdr->addr1) &&
+	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
+		return -1;
+
+	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
+	if (ret < 0)
+		return ret;
+
+	ehdr = (struct ethhdr *) rx->skb->data;
+	if (ehdr->h_proto == rx->sdata->control_port_protocol)
+		*port_control = true;
+	else if (check_port_control)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * requires that rx->skb is a frame with ethernet header
+ */
+static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
+{
+	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
+		= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
+	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
+
+	/*
+	 * Allow EAPOL frames to us/the PAE group address regardless of
+	 * whether the frame was encrypted or not, and always disallow
+	 * all other destination addresses for them.
+	 */
+	if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
+		return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
+		       ether_addr_equal(ehdr->h_dest, pae_group_addr);
+
+	if (ieee80211_802_1x_port_control(rx) ||
+	    ieee80211_drop_unencrypted(rx, fc))
+		return false;
+
+	return true;
+}
+
+static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
+						 struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct net_device *dev = sdata->dev;
+
+	if (unlikely((skb->protocol == sdata->control_port_protocol ||
+		      skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
+		     sdata->control_port_over_nl80211)) {
+		struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+		bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
+
+		cfg80211_rx_control_port(dev, skb, noencrypt);
+		dev_kfree_skb(skb);
+	} else {
+		struct ethhdr *ehdr = (void *)skb_mac_header(skb);
+
+		memset(skb->cb, 0, sizeof(skb->cb));
+
+		/*
+		 * 802.1X over 802.11 requires that the authenticator address
+		 * be used for EAPOL frames. However, 802.1X allows the use of
+		 * the PAE group address instead. If the interface is part of
+		 * a bridge and we pass the frame with the PAE group address,
+		 * then the bridge will forward it to the network (even if the
+		 * client was not associated yet), which isn't supposed to
+		 * happen.
+		 * To avoid that, rewrite the destination address to our own
+		 * address, so that the authenticator (e.g. hostapd) will see
+		 * the frame, but bridge won't forward it anywhere else. Note
+		 * that due to earlier filtering, the only other address can
+		 * be the PAE group address.
+		 */
+		if (unlikely(skb->protocol == sdata->control_port_protocol &&
+			     !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
+			ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
+
+		/* deliver to local stack */
+		if (rx->napi)
+			napi_gro_receive(rx->napi, skb);
+		else
+			netif_receive_skb(skb);
+	}
+}
+
+/*
+ * requires that rx->skb is a frame with ethernet header
+ */
+static void
+ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct net_device *dev = sdata->dev;
+	struct sk_buff *skb, *xmit_skb;
+	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
+	struct sta_info *dsta;
+
+	skb = rx->skb;
+	xmit_skb = NULL;
+
+	ieee80211_rx_stats(dev, skb->len);
+
+	if (rx->sta) {
+		/* The seqno index has the same property as needed
+		 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
+		 * for non-QoS-data frames. Here we know it's a data
+		 * frame, so count MSDUs.
+		 */
+		u64_stats_update_begin(&rx->sta->rx_stats.syncp);
+		rx->sta->rx_stats.msdu[rx->seqno_idx]++;
+		u64_stats_update_end(&rx->sta->rx_stats.syncp);
+	}
+
+	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
+	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
+	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
+	    ehdr->h_proto != rx->sdata->control_port_protocol &&
+	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
+		if (is_multicast_ether_addr(ehdr->h_dest) &&
+		    ieee80211_vif_get_num_mcast_if(sdata) != 0) {
+			/*
+			 * send multicast frames both to higher layers in
+			 * local net stack and back to the wireless medium
+			 */
+			xmit_skb = skb_copy(skb, GFP_ATOMIC);
+			if (!xmit_skb)
+				net_info_ratelimited("%s: failed to clone multicast frame\n",
+						    dev->name);
+		} else if (!is_multicast_ether_addr(ehdr->h_dest)) {
+			dsta = sta_info_get(sdata, skb->data);
+			if (dsta) {
+				/*
+				 * The destination station is associated to
+				 * this AP (in this VLAN), so send the frame
+				 * directly to it and do not pass it to local
+				 * net stack.
+				 */
+				xmit_skb = skb;
+				skb = NULL;
+			}
+		}
+	}
+
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+	if (skb) {
+		/* 'align' will only take the values 0 or 2 here since all
+		 * frames are required to be aligned to 2-byte boundaries
+		 * when being passed to mac80211; the code here works just
+		 * as well if that isn't true, but mac80211 assumes it can
+		 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
+		 */
+		int align;
+
+		align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
+		if (align) {
+			if (WARN_ON(skb_headroom(skb) < 3)) {
+				dev_kfree_skb(skb);
+				skb = NULL;
+			} else {
+				u8 *data = skb->data;
+				size_t len = skb_headlen(skb);
+				skb->data -= align;
+				memmove(skb->data, data, len);
+				skb_set_tail_pointer(skb, len);
+			}
+		}
+	}
+#endif
+
+	if (skb) {
+		skb->protocol = eth_type_trans(skb, dev);
+		ieee80211_deliver_skb_to_local_stack(skb, rx);
+	}
+
+	if (xmit_skb) {
+		/*
+		 * Send to wireless media and increase priority by 256 to
+		 * keep the received priority instead of reclassifying
+		 * the frame (see cfg80211_classify8021d).
+		 */
+		xmit_skb->priority += 256;
+		xmit_skb->protocol = htons(ETH_P_802_3);
+		skb_reset_network_header(xmit_skb);
+		skb_reset_mac_header(xmit_skb);
+		dev_queue_xmit(xmit_skb);
+	}
+}
+
+static ieee80211_rx_result debug_noinline
+__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
+{
+	struct net_device *dev = rx->sdata->dev;
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	__le16 fc = hdr->frame_control;
+	struct sk_buff_head frame_list;
+	struct ethhdr ethhdr;
+	const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
+
+	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
+		check_da = NULL;
+		check_sa = NULL;
+	} else switch (rx->sdata->vif.type) {
+		case NL80211_IFTYPE_AP:
+		case NL80211_IFTYPE_AP_VLAN:
+			check_da = NULL;
+			break;
+		case NL80211_IFTYPE_STATION:
+			if (!rx->sta ||
+			    !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
+				check_sa = NULL;
+			break;
+		case NL80211_IFTYPE_MESH_POINT:
+			check_sa = NULL;
+			break;
+		default:
+			break;
+	}
+
+	skb->dev = dev;
+	__skb_queue_head_init(&frame_list);
+
+	if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
+					  rx->sdata->vif.addr,
+					  rx->sdata->vif.type,
+					  data_offset, true))
+		return RX_DROP_UNUSABLE;
+
+	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
+				 rx->sdata->vif.type,
+				 rx->local->hw.extra_tx_headroom,
+				 check_da, check_sa);
+
+	while (!skb_queue_empty(&frame_list)) {
+		rx->skb = __skb_dequeue(&frame_list);
+
+		if (!ieee80211_frame_allowed(rx, fc)) {
+			dev_kfree_skb(rx->skb);
+			continue;
+		}
+
+		ieee80211_deliver_skb(rx);
+	}
+
+	return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
+{
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	__le16 fc = hdr->frame_control;
+
+	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
+		return RX_CONTINUE;
+
+	if (unlikely(!ieee80211_is_data(fc)))
+		return RX_CONTINUE;
+
+	if (unlikely(!ieee80211_is_data_present(fc)))
+		return RX_DROP_MONITOR;
+
+	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
+		switch (rx->sdata->vif.type) {
+		case NL80211_IFTYPE_AP_VLAN:
+			if (!rx->sdata->u.vlan.sta)
+				return RX_DROP_UNUSABLE;
+			break;
+		case NL80211_IFTYPE_STATION:
+			if (!rx->sdata->u.mgd.use_4addr)
+				return RX_DROP_UNUSABLE;
+			break;
+		default:
+			return RX_DROP_UNUSABLE;
+		}
+	}
+
+	if (is_multicast_ether_addr(hdr->addr1))
+		return RX_DROP_UNUSABLE;
+
+	if (rx->key) {
+		/*
+		 * We should not receive A-MSDUs on pre-HT connections,
+		 * and HT connections cannot use old ciphers. Thus drop
+		 * them, as in those cases we couldn't even have SPP
+		 * A-MSDUs or such.
+		 */
+		switch (rx->key->conf.cipher) {
+		case WLAN_CIPHER_SUITE_WEP40:
+		case WLAN_CIPHER_SUITE_WEP104:
+		case WLAN_CIPHER_SUITE_TKIP:
+			return RX_DROP_UNUSABLE;
+		default:
+			break;
+		}
+	}
+
+	return __ieee80211_rx_h_amsdu(rx, 0);
+}
+
+#ifdef CONFIG_MAC80211_MESH
+static ieee80211_rx_result
+ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_hdr *fwd_hdr, *hdr;
+	struct ieee80211_tx_info *info;
+	struct ieee80211s_hdr *mesh_hdr;
+	struct sk_buff *skb = rx->skb, *fwd_skb;
+	struct ieee80211_local *local = rx->local;
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	u16 ac, q, hdrlen;
+	int tailroom = 0;
+
+	hdr = (struct ieee80211_hdr *) skb->data;
+	hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+	/* make sure fixed part of mesh header is there, also checks skb len */
+	if (!pskb_may_pull(rx->skb, hdrlen + 6))
+		return RX_DROP_MONITOR;
+
+	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
+
+	/* make sure full mesh header is there, also checks skb len */
+	if (!pskb_may_pull(rx->skb,
+			   hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
+		return RX_DROP_MONITOR;
+
+	/* reload pointers */
+	hdr = (struct ieee80211_hdr *) skb->data;
+	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
+
+	if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
+		return RX_DROP_MONITOR;
+
+	/* frame is in RMC, don't forward */
+	if (ieee80211_is_data(hdr->frame_control) &&
+	    is_multicast_ether_addr(hdr->addr1) &&
+	    mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
+		return RX_DROP_MONITOR;
+
+	if (!ieee80211_is_data(hdr->frame_control))
+		return RX_CONTINUE;
+
+	if (!mesh_hdr->ttl)
+		return RX_DROP_MONITOR;
+
+	if (mesh_hdr->flags & MESH_FLAGS_AE) {
+		struct mesh_path *mppath;
+		char *proxied_addr;
+		char *mpp_addr;
+
+		if (is_multicast_ether_addr(hdr->addr1)) {
+			mpp_addr = hdr->addr3;
+			proxied_addr = mesh_hdr->eaddr1;
+		} else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
+			    MESH_FLAGS_AE_A5_A6) {
+			/* has_a4 already checked in ieee80211_rx_mesh_check */
+			mpp_addr = hdr->addr4;
+			proxied_addr = mesh_hdr->eaddr2;
+		} else {
+			return RX_DROP_MONITOR;
+		}
+
+		rcu_read_lock();
+		mppath = mpp_path_lookup(sdata, proxied_addr);
+		if (!mppath) {
+			mpp_path_add(sdata, proxied_addr, mpp_addr);
+		} else {
+			spin_lock_bh(&mppath->state_lock);
+			if (!ether_addr_equal(mppath->mpp, mpp_addr))
+				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
+			mppath->exp_time = jiffies;
+			spin_unlock_bh(&mppath->state_lock);
+		}
+		rcu_read_unlock();
+	}
+
+	/* Frame has reached destination.  Don't forward */
+	if (!is_multicast_ether_addr(hdr->addr1) &&
+	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
+		return RX_CONTINUE;
+
+	ac = ieee802_1d_to_ac[skb->priority];
+	q = sdata->vif.hw_queue[ac];
+	if (ieee80211_queue_stopped(&local->hw, q)) {
+		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
+		return RX_DROP_MONITOR;
+	}
+	skb_set_queue_mapping(skb, ac);
+
+	if (!--mesh_hdr->ttl) {
+		if (!is_multicast_ether_addr(hdr->addr1))
+			IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
+						     dropped_frames_ttl);
+		goto out;
+	}
+
+	if (!ifmsh->mshcfg.dot11MeshForwarding)
+		goto out;
+
+	if (sdata->crypto_tx_tailroom_needed_cnt)
+		tailroom = IEEE80211_ENCRYPT_TAILROOM;
+
+	fwd_skb = skb_copy_expand(skb, local->tx_headroom +
+				       sdata->encrypt_headroom,
+				  tailroom, GFP_ATOMIC);
+	if (!fwd_skb)
+		goto out;
+
+	fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
+	fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
+	info = IEEE80211_SKB_CB(fwd_skb);
+	memset(info, 0, sizeof(*info));
+	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
+	info->control.vif = &rx->sdata->vif;
+	info->control.jiffies = jiffies;
+	if (is_multicast_ether_addr(fwd_hdr->addr1)) {
+		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
+		memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
+		/* update power mode indication when forwarding */
+		ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
+	} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
+		/* mesh power mode flags updated in mesh_nexthop_lookup */
+		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
+	} else {
+		/* unable to resolve next hop */
+		mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
+				   fwd_hdr->addr3, 0,
+				   WLAN_REASON_MESH_PATH_NOFORWARD,
+				   fwd_hdr->addr2);
+		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
+		kfree_skb(fwd_skb);
+		return RX_DROP_MONITOR;
+	}
+
+	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
+	ieee80211_add_pending_skb(local, fwd_skb);
+ out:
+	if (is_multicast_ether_addr(hdr->addr1))
+		return RX_CONTINUE;
+	return RX_DROP_MONITOR;
+}
+#endif
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_local *local = rx->local;
+	struct net_device *dev = sdata->dev;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+	__le16 fc = hdr->frame_control;
+	bool port_control;
+	int err;
+
+	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
+		return RX_CONTINUE;
+
+	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+		return RX_DROP_MONITOR;
+
+	/*
+	 * Send unexpected-4addr-frame event to hostapd. For older versions,
+	 * also drop the frame to cooked monitor interfaces.
+	 */
+	if (ieee80211_has_a4(hdr->frame_control) &&
+	    sdata->vif.type == NL80211_IFTYPE_AP) {
+		if (rx->sta &&
+		    !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
+			cfg80211_rx_unexpected_4addr_frame(
+				rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
+		return RX_DROP_MONITOR;
+	}
+
+	err = __ieee80211_data_to_8023(rx, &port_control);
+	if (unlikely(err))
+		return RX_DROP_UNUSABLE;
+
+	if (!ieee80211_frame_allowed(rx, fc))
+		return RX_DROP_MONITOR;
+
+	/* directly handle TDLS channel switch requests/responses */
+	if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
+						cpu_to_be16(ETH_P_TDLS))) {
+		struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
+
+		if (pskb_may_pull(rx->skb,
+				  offsetof(struct ieee80211_tdls_data, u)) &&
+		    tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
+		    tf->category == WLAN_CATEGORY_TDLS &&
+		    (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
+		     tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
+			skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
+			schedule_work(&local->tdls_chsw_work);
+			if (rx->sta)
+				rx->sta->rx_stats.packets++;
+
+			return RX_QUEUED;
+		}
+	}
+
+	if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+	    unlikely(port_control) && sdata->bss) {
+		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
+				     u.ap);
+		dev = sdata->dev;
+		rx->sdata = sdata;
+	}
+
+	rx->skb->dev = dev;
+
+	if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
+	    local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
+	    !is_multicast_ether_addr(
+		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
+	    (!local->scanning &&
+	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
+		mod_timer(&local->dynamic_ps_timer, jiffies +
+			  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
+
+	ieee80211_deliver_skb(rx);
+
+	return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
+{
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
+	struct tid_ampdu_rx *tid_agg_rx;
+	u16 start_seq_num;
+	u16 tid;
+
+	if (likely(!ieee80211_is_ctl(bar->frame_control)))
+		return RX_CONTINUE;
+
+	if (ieee80211_is_back_req(bar->frame_control)) {
+		struct {
+			__le16 control, start_seq_num;
+		} __packed bar_data;
+		struct ieee80211_event event = {
+			.type = BAR_RX_EVENT,
+		};
+
+		if (!rx->sta)
+			return RX_DROP_MONITOR;
+
+		if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
+				  &bar_data, sizeof(bar_data)))
+			return RX_DROP_MONITOR;
+
+		tid = le16_to_cpu(bar_data.control) >> 12;
+
+		if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
+		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
+			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
+					     WLAN_BACK_RECIPIENT,
+					     WLAN_REASON_QSTA_REQUIRE_SETUP);
+
+		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
+		if (!tid_agg_rx)
+			return RX_DROP_MONITOR;
+
+		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
+		event.u.ba.tid = tid;
+		event.u.ba.ssn = start_seq_num;
+		event.u.ba.sta = &rx->sta->sta;
+
+		/* reset session timer */
+		if (tid_agg_rx->timeout)
+			mod_timer(&tid_agg_rx->session_timer,
+				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
+
+		spin_lock(&tid_agg_rx->reorder_lock);
+		/* release stored frames up to start of BAR */
+		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
+						 start_seq_num, frames);
+		spin_unlock(&tid_agg_rx->reorder_lock);
+
+		drv_event_callback(rx->local, rx->sdata, &event);
+
+		kfree_skb(skb);
+		return RX_QUEUED;
+	}
+
+	/*
+	 * After this point, we only want management frames,
+	 * so we can drop all remaining control frames to
+	 * cooked monitor interfaces.
+	 */
+	return RX_DROP_MONITOR;
+}
+
+static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
+					   struct ieee80211_mgmt *mgmt,
+					   size_t len)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sk_buff *skb;
+	struct ieee80211_mgmt *resp;
+
+	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
+		/* Not to own unicast address */
+		return;
+	}
+
+	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
+	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
+		/* Not from the current AP or not associated yet. */
+		return;
+	}
+
+	if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
+		/* Too short SA Query request frame */
+		return;
+	}
+
+	skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
+	if (skb == NULL)
+		return;
+
+	skb_reserve(skb, local->hw.extra_tx_headroom);
+	resp = skb_put_zero(skb, 24);
+	memcpy(resp->da, mgmt->sa, ETH_ALEN);
+	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
+	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
+	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+					  IEEE80211_STYPE_ACTION);
+	skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
+	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
+	resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
+	memcpy(resp->u.action.u.sa_query.trans_id,
+	       mgmt->u.action.u.sa_query.trans_id,
+	       WLAN_SA_QUERY_TR_ID_LEN);
+
+	ieee80211_tx_skb(sdata, skb);
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+	/*
+	 * From here on, look only at management frames.
+	 * Data and control frames are already handled,
+	 * and unknown (reserved) frames are useless.
+	 */
+	if (rx->skb->len < 24)
+		return RX_DROP_MONITOR;
+
+	if (!ieee80211_is_mgmt(mgmt->frame_control))
+		return RX_DROP_MONITOR;
+
+	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
+	    ieee80211_is_beacon(mgmt->frame_control) &&
+	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
+		int sig = 0;
+
+		if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
+		    !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
+			sig = status->signal;
+
+		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
+					    rx->skb->data, rx->skb->len,
+					    status->freq, sig);
+		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
+	}
+
+	if (ieee80211_drop_unencrypted_mgmt(rx))
+		return RX_DROP_UNUSABLE;
+
+	return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_local *local = rx->local;
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+	int len = rx->skb->len;
+
+	if (!ieee80211_is_action(mgmt->frame_control))
+		return RX_CONTINUE;
+
+	/* drop too small frames */
+	if (len < IEEE80211_MIN_ACTION_SIZE)
+		return RX_DROP_UNUSABLE;
+
+	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
+	    mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
+	    mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
+		return RX_DROP_UNUSABLE;
+
+	switch (mgmt->u.action.category) {
+	case WLAN_CATEGORY_HT:
+		/* reject HT action frames from stations not supporting HT */
+		if (!rx->sta->sta.ht_cap.ht_supported)
+			goto invalid;
+
+		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+		    sdata->vif.type != NL80211_IFTYPE_AP &&
+		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
+			break;
+
+		/* verify action & smps_control/chanwidth are present */
+		if (len < IEEE80211_MIN_ACTION_SIZE + 2)
+			goto invalid;
+
+		switch (mgmt->u.action.u.ht_smps.action) {
+		case WLAN_HT_ACTION_SMPS: {
+			struct ieee80211_supported_band *sband;
+			enum ieee80211_smps_mode smps_mode;
+			struct sta_opmode_info sta_opmode = {};
+
+			/* convert to HT capability */
+			switch (mgmt->u.action.u.ht_smps.smps_control) {
+			case WLAN_HT_SMPS_CONTROL_DISABLED:
+				smps_mode = IEEE80211_SMPS_OFF;
+				break;
+			case WLAN_HT_SMPS_CONTROL_STATIC:
+				smps_mode = IEEE80211_SMPS_STATIC;
+				break;
+			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
+				smps_mode = IEEE80211_SMPS_DYNAMIC;
+				break;
+			default:
+				goto invalid;
+			}
+
+			/* if no change do nothing */
+			if (rx->sta->sta.smps_mode == smps_mode)
+				goto handled;
+			rx->sta->sta.smps_mode = smps_mode;
+			sta_opmode.smps_mode =
+				ieee80211_smps_mode_to_smps_mode(smps_mode);
+			sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
+
+			sband = rx->local->hw.wiphy->bands[status->band];
+
+			rate_control_rate_update(local, sband, rx->sta,
+						 IEEE80211_RC_SMPS_CHANGED);
+			cfg80211_sta_opmode_change_notify(sdata->dev,
+							  rx->sta->addr,
+							  &sta_opmode,
+							  GFP_ATOMIC);
+			goto handled;
+		}
+		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
+			struct ieee80211_supported_band *sband;
+			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
+			enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
+			struct sta_opmode_info sta_opmode = {};
+
+			/* If it doesn't support 40 MHz it can't change ... */
+			if (!(rx->sta->sta.ht_cap.cap &
+					IEEE80211_HT_CAP_SUP_WIDTH_20_40))
+				goto handled;
+
+			if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
+				max_bw = IEEE80211_STA_RX_BW_20;
+			else
+				max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
+
+			/* set cur_max_bandwidth and recalc sta bw */
+			rx->sta->cur_max_bandwidth = max_bw;
+			new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
+
+			if (rx->sta->sta.bandwidth == new_bw)
+				goto handled;
+
+			rx->sta->sta.bandwidth = new_bw;
+			sband = rx->local->hw.wiphy->bands[status->band];
+			sta_opmode.bw =
+				ieee80211_sta_rx_bw_to_chan_width(rx->sta);
+			sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
+
+			rate_control_rate_update(local, sband, rx->sta,
+						 IEEE80211_RC_BW_CHANGED);
+			cfg80211_sta_opmode_change_notify(sdata->dev,
+							  rx->sta->addr,
+							  &sta_opmode,
+							  GFP_ATOMIC);
+			goto handled;
+		}
+		default:
+			goto invalid;
+		}
+
+		break;
+	case WLAN_CATEGORY_PUBLIC:
+		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+			goto invalid;
+		if (sdata->vif.type != NL80211_IFTYPE_STATION)
+			break;
+		if (!rx->sta)
+			break;
+		if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
+			break;
+		if (mgmt->u.action.u.ext_chan_switch.action_code !=
+				WLAN_PUB_ACTION_EXT_CHANSW_ANN)
+			break;
+		if (len < offsetof(struct ieee80211_mgmt,
+				   u.action.u.ext_chan_switch.variable))
+			goto invalid;
+		goto queue;
+	case WLAN_CATEGORY_VHT:
+		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+		    sdata->vif.type != NL80211_IFTYPE_AP &&
+		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
+			break;
+
+		/* verify action code is present */
+		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+			goto invalid;
+
+		switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
+		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
+			/* verify opmode is present */
+			if (len < IEEE80211_MIN_ACTION_SIZE + 2)
+				goto invalid;
+			goto queue;
+		}
+		case WLAN_VHT_ACTION_GROUPID_MGMT: {
+			if (len < IEEE80211_MIN_ACTION_SIZE + 25)
+				goto invalid;
+			goto queue;
+		}
+		default:
+			break;
+		}
+		break;
+	case WLAN_CATEGORY_BACK:
+		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
+		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+		    sdata->vif.type != NL80211_IFTYPE_AP &&
+		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
+			break;
+
+		/* verify action_code is present */
+		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+			break;
+
+		switch (mgmt->u.action.u.addba_req.action_code) {
+		case WLAN_ACTION_ADDBA_REQ:
+			if (len < (IEEE80211_MIN_ACTION_SIZE +
+				   sizeof(mgmt->u.action.u.addba_req)))
+				goto invalid;
+			break;
+		case WLAN_ACTION_ADDBA_RESP:
+			if (len < (IEEE80211_MIN_ACTION_SIZE +
+				   sizeof(mgmt->u.action.u.addba_resp)))
+				goto invalid;
+			break;
+		case WLAN_ACTION_DELBA:
+			if (len < (IEEE80211_MIN_ACTION_SIZE +
+				   sizeof(mgmt->u.action.u.delba)))
+				goto invalid;
+			break;
+		default:
+			goto invalid;
+		}
+
+		goto queue;
+	case WLAN_CATEGORY_SPECTRUM_MGMT:
+		/* verify action_code is present */
+		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+			break;
+
+		switch (mgmt->u.action.u.measurement.action_code) {
+		case WLAN_ACTION_SPCT_MSR_REQ:
+			if (status->band != NL80211_BAND_5GHZ)
+				break;
+
+			if (len < (IEEE80211_MIN_ACTION_SIZE +
+				   sizeof(mgmt->u.action.u.measurement)))
+				break;
+
+			if (sdata->vif.type != NL80211_IFTYPE_STATION)
+				break;
+
+			ieee80211_process_measurement_req(sdata, mgmt, len);
+			goto handled;
+		case WLAN_ACTION_SPCT_CHL_SWITCH: {
+			u8 *bssid;
+			if (len < (IEEE80211_MIN_ACTION_SIZE +
+				   sizeof(mgmt->u.action.u.chan_switch)))
+				break;
+
+			if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+			    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+			    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
+				break;
+
+			if (sdata->vif.type == NL80211_IFTYPE_STATION)
+				bssid = sdata->u.mgd.bssid;
+			else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+				bssid = sdata->u.ibss.bssid;
+			else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
+				bssid = mgmt->sa;
+			else
+				break;
+
+			if (!ether_addr_equal(mgmt->bssid, bssid))
+				break;
+
+			goto queue;
+			}
+		}
+		break;
+	case WLAN_CATEGORY_SA_QUERY:
+		if (len < (IEEE80211_MIN_ACTION_SIZE +
+			   sizeof(mgmt->u.action.u.sa_query)))
+			break;
+
+		switch (mgmt->u.action.u.sa_query.action) {
+		case WLAN_ACTION_SA_QUERY_REQUEST:
+			if (sdata->vif.type != NL80211_IFTYPE_STATION)
+				break;
+			ieee80211_process_sa_query_req(sdata, mgmt, len);
+			goto handled;
+		}
+		break;
+	case WLAN_CATEGORY_SELF_PROTECTED:
+		if (len < (IEEE80211_MIN_ACTION_SIZE +
+			   sizeof(mgmt->u.action.u.self_prot.action_code)))
+			break;
+
+		switch (mgmt->u.action.u.self_prot.action_code) {
+		case WLAN_SP_MESH_PEERING_OPEN:
+		case WLAN_SP_MESH_PEERING_CLOSE:
+		case WLAN_SP_MESH_PEERING_CONFIRM:
+			if (!ieee80211_vif_is_mesh(&sdata->vif))
+				goto invalid;
+			if (sdata->u.mesh.user_mpm)
+				/* userspace handles this frame */
+				break;
+			goto queue;
+		case WLAN_SP_MGK_INFORM:
+		case WLAN_SP_MGK_ACK:
+			if (!ieee80211_vif_is_mesh(&sdata->vif))
+				goto invalid;
+			break;
+		}
+		break;
+	case WLAN_CATEGORY_MESH_ACTION:
+		if (len < (IEEE80211_MIN_ACTION_SIZE +
+			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
+			break;
+
+		if (!ieee80211_vif_is_mesh(&sdata->vif))
+			break;
+		if (mesh_action_is_path_sel(mgmt) &&
+		    !mesh_path_sel_is_hwmp(sdata))
+			break;
+		goto queue;
+	}
+
+	return RX_CONTINUE;
+
+ invalid:
+	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
+	/* will return in the next handlers */
+	return RX_CONTINUE;
+
+ handled:
+	if (rx->sta)
+		rx->sta->rx_stats.packets++;
+	dev_kfree_skb(rx->skb);
+	return RX_QUEUED;
+
+ queue:
+	skb_queue_tail(&sdata->skb_queue, rx->skb);
+	ieee80211_queue_work(&local->hw, &sdata->work);
+	if (rx->sta)
+		rx->sta->rx_stats.packets++;
+	return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+	int sig = 0;
+
+	/* skip known-bad action frames and return them in the next handler */
+	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
+		return RX_CONTINUE;
+
+	/*
+	 * Getting here means the kernel doesn't know how to handle
+	 * it, but maybe userspace does ... include returned frames
+	 * so userspace can register for those to know whether ones
+	 * it transmitted were processed or returned.
+	 */
+
+	if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
+	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
+		sig = status->signal;
+
+	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
+			     rx->skb->data, rx->skb->len, 0)) {
+		if (rx->sta)
+			rx->sta->rx_stats.packets++;
+		dev_kfree_skb(rx->skb);
+		return RX_QUEUED;
+	}
+
+	return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_local *local = rx->local;
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+	struct sk_buff *nskb;
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+	if (!ieee80211_is_action(mgmt->frame_control))
+		return RX_CONTINUE;
+
+	/*
+	 * For AP mode, hostapd is responsible for handling any action
+	 * frames that we didn't handle, including returning unknown
+	 * ones. For all other modes we will return them to the sender,
+	 * setting the 0x80 bit in the action category, as required by
+	 * 802.11-2012 9.24.4.
+	 * Newer versions of hostapd shall also use the management frame
+	 * registration mechanisms, but older ones still use cooked
+	 * monitor interfaces so push all frames there.
+	 */
+	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
+	    (sdata->vif.type == NL80211_IFTYPE_AP ||
+	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
+		return RX_DROP_MONITOR;
+
+	if (is_multicast_ether_addr(mgmt->da))
+		return RX_DROP_MONITOR;
+
+	/* do not return rejected action frames */
+	if (mgmt->u.action.category & 0x80)
+		return RX_DROP_UNUSABLE;
+
+	nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
+			       GFP_ATOMIC);
+	if (nskb) {
+		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
+
+		nmgmt->u.action.category |= 0x80;
+		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
+		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
+
+		memset(nskb->cb, 0, sizeof(nskb->cb));
+
+		if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
+			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
+
+			info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
+				      IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
+				      IEEE80211_TX_CTL_NO_CCK_RATE;
+			if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
+				info->hw_queue =
+					local->hw.offchannel_tx_hw_queue;
+		}
+
+		__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
+					    status->band, 0);
+	}
+	dev_kfree_skb(rx->skb);
+	return RX_QUEUED;
+}
+
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
+	__le16 stype;
+
+	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
+
+	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
+	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+	    sdata->vif.type != NL80211_IFTYPE_OCB &&
+	    sdata->vif.type != NL80211_IFTYPE_STATION)
+		return RX_DROP_MONITOR;
+
+	switch (stype) {
+	case cpu_to_le16(IEEE80211_STYPE_AUTH):
+	case cpu_to_le16(IEEE80211_STYPE_BEACON):
+	case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
+		/* process for all: mesh, mlme, ibss */
+		break;
+	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
+		if (is_multicast_ether_addr(mgmt->da) &&
+		    !is_broadcast_ether_addr(mgmt->da))
+			return RX_DROP_MONITOR;
+
+		/* process only for station/IBSS */
+		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
+			return RX_DROP_MONITOR;
+		break;
+	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
+	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
+	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
+		if (is_multicast_ether_addr(mgmt->da) &&
+		    !is_broadcast_ether_addr(mgmt->da))
+			return RX_DROP_MONITOR;
+
+		/* process only for station */
+		if (sdata->vif.type != NL80211_IFTYPE_STATION)
+			return RX_DROP_MONITOR;
+		break;
+	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
+		/* process only for ibss and mesh */
+		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
+			return RX_DROP_MONITOR;
+		break;
+	default:
+		return RX_DROP_MONITOR;
+	}
+
+	/* queue up frame and kick off work to process it */
+	skb_queue_tail(&sdata->skb_queue, rx->skb);
+	ieee80211_queue_work(&rx->local->hw, &sdata->work);
+	if (rx->sta)
+		rx->sta->rx_stats.packets++;
+
+	return RX_QUEUED;
+}
+
+static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
+					struct ieee80211_rate *rate)
+{
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_local *local = rx->local;
+	struct sk_buff *skb = rx->skb, *skb2;
+	struct net_device *prev_dev = NULL;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	int needed_headroom;
+
+	/*
+	 * If cooked monitor has been processed already, then
+	 * don't do it again. If not, set the flag.
+	 */
+	if (rx->flags & IEEE80211_RX_CMNTR)
+		goto out_free_skb;
+	rx->flags |= IEEE80211_RX_CMNTR;
+
+	/* If there are no cooked monitor interfaces, just free the SKB */
+	if (!local->cooked_mntrs)
+		goto out_free_skb;
+
+	/* vendor data is long removed here */
+	status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
+	/* room for the radiotap header based on driver features */
+	needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
+
+	if (skb_headroom(skb) < needed_headroom &&
+	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
+		goto out_free_skb;
+
+	/* prepend radiotap information */
+	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
+					 false);
+
+	skb_reset_mac_header(skb);
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+	skb->pkt_type = PACKET_OTHERHOST;
+	skb->protocol = htons(ETH_P_802_2);
+
+	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		if (!ieee80211_sdata_running(sdata))
+			continue;
+
+		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
+		    !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
+			continue;
+
+		if (prev_dev) {
+			skb2 = skb_clone(skb, GFP_ATOMIC);
+			if (skb2) {
+				skb2->dev = prev_dev;
+				netif_receive_skb(skb2);
+			}
+		}
+
+		prev_dev = sdata->dev;
+		ieee80211_rx_stats(sdata->dev, skb->len);
+	}
+
+	if (prev_dev) {
+		skb->dev = prev_dev;
+		netif_receive_skb(skb);
+		return;
+	}
+
+ out_free_skb:
+	dev_kfree_skb(skb);
+}
+
+static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
+					 ieee80211_rx_result res)
+{
+	switch (res) {
+	case RX_DROP_MONITOR:
+		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
+		if (rx->sta)
+			rx->sta->rx_stats.dropped++;
+		/* fall through */
+	case RX_CONTINUE: {
+		struct ieee80211_rate *rate = NULL;
+		struct ieee80211_supported_band *sband;
+		struct ieee80211_rx_status *status;
+
+		status = IEEE80211_SKB_RXCB((rx->skb));
+
+		sband = rx->local->hw.wiphy->bands[status->band];
+		if (status->encoding == RX_ENC_LEGACY)
+			rate = &sband->bitrates[status->rate_idx];
+
+		ieee80211_rx_cooked_monitor(rx, rate);
+		break;
+		}
+	case RX_DROP_UNUSABLE:
+		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
+		if (rx->sta)
+			rx->sta->rx_stats.dropped++;
+		dev_kfree_skb(rx->skb);
+		break;
+	case RX_QUEUED:
+		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
+		break;
+	}
+}
+
+static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
+				  struct sk_buff_head *frames)
+{
+	ieee80211_rx_result res = RX_DROP_MONITOR;
+	struct sk_buff *skb;
+
+#define CALL_RXH(rxh)			\
+	do {				\
+		res = rxh(rx);		\
+		if (res != RX_CONTINUE)	\
+			goto rxh_next;  \
+	} while (0)
+
+	/* Lock here to avoid hitting all of the data used in the RX
+	 * path (e.g. key data, station data, ...) concurrently when
+	 * a frame is released from the reorder buffer due to timeout
+	 * from the timer, potentially concurrently with RX from the
+	 * driver.
+	 */
+	spin_lock_bh(&rx->local->rx_path_lock);
+
+	while ((skb = __skb_dequeue(frames))) {
+		/*
+		 * all the other fields are valid across frames
+		 * that belong to an aMPDU since they are on the
+		 * same TID from the same station
+		 */
+		rx->skb = skb;
+
+		CALL_RXH(ieee80211_rx_h_check_more_data);
+		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
+		CALL_RXH(ieee80211_rx_h_sta_process);
+		CALL_RXH(ieee80211_rx_h_decrypt);
+		CALL_RXH(ieee80211_rx_h_defragment);
+		CALL_RXH(ieee80211_rx_h_michael_mic_verify);
+		/* must be after MMIC verify so header is counted in MPDU mic */
+#ifdef CONFIG_MAC80211_MESH
+		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
+			CALL_RXH(ieee80211_rx_h_mesh_fwding);
+#endif
+		CALL_RXH(ieee80211_rx_h_amsdu);
+		CALL_RXH(ieee80211_rx_h_data);
+
+		/* special treatment -- needs the queue */
+		res = ieee80211_rx_h_ctrl(rx, frames);
+		if (res != RX_CONTINUE)
+			goto rxh_next;
+
+		CALL_RXH(ieee80211_rx_h_mgmt_check);
+		CALL_RXH(ieee80211_rx_h_action);
+		CALL_RXH(ieee80211_rx_h_userspace_mgmt);
+		CALL_RXH(ieee80211_rx_h_action_return);
+		CALL_RXH(ieee80211_rx_h_mgmt);
+
+ rxh_next:
+		ieee80211_rx_handlers_result(rx, res);
+
+#undef CALL_RXH
+	}
+
+	spin_unlock_bh(&rx->local->rx_path_lock);
+}
+
+static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
+{
+	struct sk_buff_head reorder_release;
+	ieee80211_rx_result res = RX_DROP_MONITOR;
+
+	__skb_queue_head_init(&reorder_release);
+
+#define CALL_RXH(rxh)			\
+	do {				\
+		res = rxh(rx);		\
+		if (res != RX_CONTINUE)	\
+			goto rxh_next;  \
+	} while (0)
+
+	CALL_RXH(ieee80211_rx_h_check_dup);
+	CALL_RXH(ieee80211_rx_h_check);
+
+	ieee80211_rx_reorder_ampdu(rx, &reorder_release);
+
+	ieee80211_rx_handlers(rx, &reorder_release);
+	return;
+
+ rxh_next:
+	ieee80211_rx_handlers_result(rx, res);
+
+#undef CALL_RXH
+}
+
+/*
+ * This function makes calls into the RX path, therefore
+ * it has to be invoked under RCU read lock.
+ */
+void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
+{
+	struct sk_buff_head frames;
+	struct ieee80211_rx_data rx = {
+		.sta = sta,
+		.sdata = sta->sdata,
+		.local = sta->local,
+		/* This is OK -- must be QoS data frame */
+		.security_idx = tid,
+		.seqno_idx = tid,
+		.napi = NULL, /* must be NULL to not have races */
+	};
+	struct tid_ampdu_rx *tid_agg_rx;
+
+	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+	if (!tid_agg_rx)
+		return;
+
+	__skb_queue_head_init(&frames);
+
+	spin_lock(&tid_agg_rx->reorder_lock);
+	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
+	spin_unlock(&tid_agg_rx->reorder_lock);
+
+	if (!skb_queue_empty(&frames)) {
+		struct ieee80211_event event = {
+			.type = BA_FRAME_TIMEOUT,
+			.u.ba.tid = tid,
+			.u.ba.sta = &sta->sta,
+		};
+		drv_event_callback(rx.local, rx.sdata, &event);
+	}
+
+	ieee80211_rx_handlers(&rx, &frames);
+}
+
+void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
+					  u16 ssn, u64 filtered,
+					  u16 received_mpdus)
+{
+	struct sta_info *sta;
+	struct tid_ampdu_rx *tid_agg_rx;
+	struct sk_buff_head frames;
+	struct ieee80211_rx_data rx = {
+		/* This is OK -- must be QoS data frame */
+		.security_idx = tid,
+		.seqno_idx = tid,
+	};
+	int i, diff;
+
+	if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
+		return;
+
+	__skb_queue_head_init(&frames);
+
+	sta = container_of(pubsta, struct sta_info, sta);
+
+	rx.sta = sta;
+	rx.sdata = sta->sdata;
+	rx.local = sta->local;
+
+	rcu_read_lock();
+	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+	if (!tid_agg_rx)
+		goto out;
+
+	spin_lock_bh(&tid_agg_rx->reorder_lock);
+
+	if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
+		int release;
+
+		/* release all frames in the reorder buffer */
+		release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
+			   IEEE80211_SN_MODULO;
+		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
+						 release, &frames);
+		/* update ssn to match received ssn */
+		tid_agg_rx->head_seq_num = ssn;
+	} else {
+		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
+						 &frames);
+	}
+
+	/* handle the case that received ssn is behind the mac ssn.
+	 * it can be tid_agg_rx->buf_size behind and still be valid */
+	diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
+	if (diff >= tid_agg_rx->buf_size) {
+		tid_agg_rx->reorder_buf_filtered = 0;
+		goto release;
+	}
+	filtered = filtered >> diff;
+	ssn += diff;
+
+	/* update bitmap */
+	for (i = 0; i < tid_agg_rx->buf_size; i++) {
+		int index = (ssn + i) % tid_agg_rx->buf_size;
+
+		tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
+		if (filtered & BIT_ULL(i))
+			tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
+	}
+
+	/* now process also frames that the filter marking released */
+	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
+
+release:
+	spin_unlock_bh(&tid_agg_rx->reorder_lock);
+
+	ieee80211_rx_handlers(&rx, &frames);
+
+ out:
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
+
+/* main receive path */
+
+static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
+{
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_hdr *hdr = (void *)skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
+	bool multicast = is_multicast_ether_addr(hdr->addr1);
+
+	switch (sdata->vif.type) {
+	case NL80211_IFTYPE_STATION:
+		if (!bssid && !sdata->u.mgd.use_4addr)
+			return false;
+		if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
+			return false;
+		if (multicast)
+			return true;
+		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
+	case NL80211_IFTYPE_ADHOC:
+		if (!bssid)
+			return false;
+		if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
+		    ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
+		    !is_valid_ether_addr(hdr->addr2))
+			return false;
+		if (ieee80211_is_beacon(hdr->frame_control))
+			return true;
+		if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
+			return false;
+		if (!multicast &&
+		    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
+			return false;
+		if (!rx->sta) {
+			int rate_idx;
+			if (status->encoding != RX_ENC_LEGACY)
+				rate_idx = 0; /* TODO: HT/VHT rates */
+			else
+				rate_idx = status->rate_idx;
+			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
+						 BIT(rate_idx));
+		}
+		return true;
+	case NL80211_IFTYPE_OCB:
+		if (!bssid)
+			return false;
+		if (!ieee80211_is_data_present(hdr->frame_control))
+			return false;
+		if (!is_broadcast_ether_addr(bssid))
+			return false;
+		if (!multicast &&
+		    !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
+			return false;
+		if (!rx->sta) {
+			int rate_idx;
+			if (status->encoding != RX_ENC_LEGACY)
+				rate_idx = 0; /* TODO: HT rates */
+			else
+				rate_idx = status->rate_idx;
+			ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
+						BIT(rate_idx));
+		}
+		return true;
+	case NL80211_IFTYPE_MESH_POINT:
+		if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
+			return false;
+		if (multicast)
+			return true;
+		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
+	case NL80211_IFTYPE_AP_VLAN:
+	case NL80211_IFTYPE_AP:
+		if (!bssid)
+			return ether_addr_equal(sdata->vif.addr, hdr->addr1);
+
+		if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
+			/*
+			 * Accept public action frames even when the
+			 * BSSID doesn't match, this is used for P2P
+			 * and location updates. Note that mac80211
+			 * itself never looks at these frames.
+			 */
+			if (!multicast &&
+			    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
+				return false;
+			if (ieee80211_is_public_action(hdr, skb->len))
+				return true;
+			return ieee80211_is_beacon(hdr->frame_control);
+		}
+
+		if (!ieee80211_has_tods(hdr->frame_control)) {
+			/* ignore data frames to TDLS-peers */
+			if (ieee80211_is_data(hdr->frame_control))
+				return false;
+			/* ignore action frames to TDLS-peers */
+			if (ieee80211_is_action(hdr->frame_control) &&
+			    !is_broadcast_ether_addr(bssid) &&
+			    !ether_addr_equal(bssid, hdr->addr1))
+				return false;
+		}
+
+		/*
+		 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
+		 * the BSSID - we've checked that already but may have accepted
+		 * the wildcard (ff:ff:ff:ff:ff:ff).
+		 *
+		 * It also says:
+		 *	The BSSID of the Data frame is determined as follows:
+		 *	a) If the STA is contained within an AP or is associated
+		 *	   with an AP, the BSSID is the address currently in use
+		 *	   by the STA contained in the AP.
+		 *
+		 * So we should not accept data frames with an address that's
+		 * multicast.
+		 *
+		 * Accepting it also opens a security problem because stations
+		 * could encrypt it with the GTK and inject traffic that way.
+		 */
+		if (ieee80211_is_data(hdr->frame_control) && multicast)
+			return false;
+
+		return true;
+	case NL80211_IFTYPE_WDS:
+		if (bssid || !ieee80211_is_data(hdr->frame_control))
+			return false;
+		return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
+	case NL80211_IFTYPE_P2P_DEVICE:
+		return ieee80211_is_public_action(hdr, skb->len) ||
+		       ieee80211_is_probe_req(hdr->frame_control) ||
+		       ieee80211_is_probe_resp(hdr->frame_control) ||
+		       ieee80211_is_beacon(hdr->frame_control);
+	case NL80211_IFTYPE_NAN:
+		/* Currently no frames on NAN interface are allowed */
+		return false;
+	default:
+		break;
+	}
+
+	WARN_ON_ONCE(1);
+	return false;
+}
+
+void ieee80211_check_fast_rx(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_key *key;
+	struct ieee80211_fast_rx fastrx = {
+		.dev = sdata->dev,
+		.vif_type = sdata->vif.type,
+		.control_port_protocol = sdata->control_port_protocol,
+	}, *old, *new = NULL;
+	bool assign = false;
+
+	/* use sparse to check that we don't return without updating */
+	__acquire(check_fast_rx);
+
+	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
+	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
+	ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
+	ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
+
+	fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
+
+	/* fast-rx doesn't do reordering */
+	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
+	    !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
+		goto clear;
+
+	switch (sdata->vif.type) {
+	case NL80211_IFTYPE_STATION:
+		if (sta->sta.tdls) {
+			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
+			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
+			fastrx.expected_ds_bits = 0;
+		} else {
+			fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
+			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
+			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
+			fastrx.expected_ds_bits =
+				cpu_to_le16(IEEE80211_FCTL_FROMDS);
+		}
+
+		if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
+			fastrx.expected_ds_bits |=
+				cpu_to_le16(IEEE80211_FCTL_TODS);
+			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
+		}
+
+		if (!sdata->u.mgd.powersave)
+			break;
+
+		/* software powersave is a huge mess, avoid all of it */
+		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
+			goto clear;
+		if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
+		    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
+			goto clear;
+		break;
+	case NL80211_IFTYPE_AP_VLAN:
+	case NL80211_IFTYPE_AP:
+		/* parallel-rx requires this, at least with calls to
+		 * ieee80211_sta_ps_transition()
+		 */
+		if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
+			goto clear;
+		fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+		fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
+		fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
+
+		fastrx.internal_forward =
+			!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
+			(sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
+			 !sdata->u.vlan.sta);
+
+		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+		    sdata->u.vlan.sta) {
+			fastrx.expected_ds_bits |=
+				cpu_to_le16(IEEE80211_FCTL_FROMDS);
+			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
+			fastrx.internal_forward = 0;
+		}
+
+		break;
+	default:
+		goto clear;
+	}
+
+	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
+		goto clear;
+
+	rcu_read_lock();
+	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
+	if (!key)
+		key = rcu_dereference(sdata->default_unicast_key);
+	if (key) {
+		switch (key->conf.cipher) {
+		case WLAN_CIPHER_SUITE_TKIP:
+			/* we don't want to deal with MMIC in fast-rx */
+			goto clear_rcu;
+		case WLAN_CIPHER_SUITE_CCMP:
+		case WLAN_CIPHER_SUITE_CCMP_256:
+		case WLAN_CIPHER_SUITE_GCMP:
+		case WLAN_CIPHER_SUITE_GCMP_256:
+			break;
+		default:
+			/* we also don't want to deal with WEP or cipher scheme
+			 * since those require looking up the key idx in the
+			 * frame, rather than assuming the PTK is used
+			 * (we need to revisit this once we implement the real
+			 * PTK index, which is now valid in the spec, but we
+			 * haven't implemented that part yet)
+			 */
+			goto clear_rcu;
+		}
+
+		fastrx.key = true;
+		fastrx.icv_len = key->conf.icv_len;
+	}
+
+	assign = true;
+ clear_rcu:
+	rcu_read_unlock();
+ clear:
+	__release(check_fast_rx);
+
+	if (assign)
+		new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
+
+	spin_lock_bh(&sta->lock);
+	old = rcu_dereference_protected(sta->fast_rx, true);
+	rcu_assign_pointer(sta->fast_rx, new);
+	spin_unlock_bh(&sta->lock);
+
+	if (old)
+		kfree_rcu(old, rcu_head);
+}
+
+void ieee80211_clear_fast_rx(struct sta_info *sta)
+{
+	struct ieee80211_fast_rx *old;
+
+	spin_lock_bh(&sta->lock);
+	old = rcu_dereference_protected(sta->fast_rx, true);
+	RCU_INIT_POINTER(sta->fast_rx, NULL);
+	spin_unlock_bh(&sta->lock);
+
+	if (old)
+		kfree_rcu(old, rcu_head);
+}
+
+void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sta_info *sta;
+
+	lockdep_assert_held(&local->sta_mtx);
+
+	list_for_each_entry(sta, &local->sta_list, list) {
+		if (sdata != sta->sdata &&
+		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
+			continue;
+		ieee80211_check_fast_rx(sta);
+	}
+}
+
+void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+
+	mutex_lock(&local->sta_mtx);
+	__ieee80211_check_fast_rx_iface(sdata);
+	mutex_unlock(&local->sta_mtx);
+}
+
+static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
+				     struct ieee80211_fast_rx *fast_rx)
+{
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_hdr *hdr = (void *)skb->data;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+	struct sta_info *sta = rx->sta;
+	int orig_len = skb->len;
+	int hdrlen = ieee80211_hdrlen(hdr->frame_control);
+	int snap_offs = hdrlen;
+	struct {
+		u8 snap[sizeof(rfc1042_header)];
+		__be16 proto;
+	} *payload __aligned(2);
+	struct {
+		u8 da[ETH_ALEN];
+		u8 sa[ETH_ALEN];
+	} addrs __aligned(2);
+	struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
+
+	if (fast_rx->uses_rss)
+		stats = this_cpu_ptr(sta->pcpu_rx_stats);
+
+	/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
+	 * to a common data structure; drivers can implement that per queue
+	 * but we don't have that information in mac80211
+	 */
+	if (!(status->flag & RX_FLAG_DUP_VALIDATED))
+		return false;
+
+#define FAST_RX_CRYPT_FLAGS	(RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
+
+	/* If using encryption, we also need to have:
+	 *  - PN_VALIDATED: similar, but the implementation is tricky
+	 *  - DECRYPTED: necessary for PN_VALIDATED
+	 */
+	if (fast_rx->key &&
+	    (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
+		return false;
+
+	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+		return false;
+
+	if (unlikely(ieee80211_is_frag(hdr)))
+		return false;
+
+	/* Since our interface address cannot be multicast, this
+	 * implicitly also rejects multicast frames without the
+	 * explicit check.
+	 *
+	 * We shouldn't get any *data* frames not addressed to us
+	 * (AP mode will accept multicast *management* frames), but
+	 * punting here will make it go through the full checks in
+	 * ieee80211_accept_frame().
+	 */
+	if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
+		return false;
+
+	if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
+					      IEEE80211_FCTL_TODS)) !=
+	    fast_rx->expected_ds_bits)
+		return false;
+
+	/* assign the key to drop unencrypted frames (later)
+	 * and strip the IV/MIC if necessary
+	 */
+	if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
+		/* GCMP header length is the same */
+		snap_offs += IEEE80211_CCMP_HDR_LEN;
+	}
+
+	if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
+		if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
+			goto drop;
+
+		payload = (void *)(skb->data + snap_offs);
+
+		if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
+			return false;
+
+		/* Don't handle these here since they require special code.
+		 * Accept AARP and IPX even though they should come with a
+		 * bridge-tunnel header - but if we get them this way then
+		 * there's little point in discarding them.
+		 */
+		if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
+			     payload->proto == fast_rx->control_port_protocol))
+			return false;
+	}
+
+	/* after this point, don't punt to the slowpath! */
+
+	if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
+	    pskb_trim(skb, skb->len - fast_rx->icv_len))
+		goto drop;
+
+	if (unlikely(fast_rx->sta_notify)) {
+		ieee80211_sta_rx_notify(rx->sdata, hdr);
+		fast_rx->sta_notify = false;
+	}
+
+	/* statistics part of ieee80211_rx_h_sta_process() */
+	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
+		stats->last_signal = status->signal;
+		if (!fast_rx->uses_rss)
+			ewma_signal_add(&sta->rx_stats_avg.signal,
+					-status->signal);
+	}
+
+	if (status->chains) {
+		int i;
+
+		stats->chains = status->chains;
+		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
+			int signal = status->chain_signal[i];
+
+			if (!(status->chains & BIT(i)))
+				continue;
+
+			stats->chain_signal_last[i] = signal;
+			if (!fast_rx->uses_rss)
+				ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
+						-signal);
+		}
+	}
+	/* end of statistics */
+
+	if (rx->key && !ieee80211_has_protected(hdr->frame_control))
+		goto drop;
+
+	if (status->rx_flags & IEEE80211_RX_AMSDU) {
+		if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
+		    RX_QUEUED)
+			goto drop;
+
+		return true;
+	}
+
+	stats->last_rx = jiffies;
+	stats->last_rate = sta_stats_encode_rate(status);
+
+	stats->fragments++;
+	stats->packets++;
+
+	/* do the header conversion - first grab the addresses */
+	ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
+	ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
+	/* remove the SNAP but leave the ethertype */
+	skb_pull(skb, snap_offs + sizeof(rfc1042_header));
+	/* push the addresses in front */
+	memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
+
+	skb->dev = fast_rx->dev;
+
+	ieee80211_rx_stats(fast_rx->dev, skb->len);
+
+	/* The seqno index has the same property as needed
+	 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
+	 * for non-QoS-data frames. Here we know it's a data
+	 * frame, so count MSDUs.
+	 */
+	u64_stats_update_begin(&stats->syncp);
+	stats->msdu[rx->seqno_idx]++;
+	stats->bytes += orig_len;
+	u64_stats_update_end(&stats->syncp);
+
+	if (fast_rx->internal_forward) {
+		struct sk_buff *xmit_skb = NULL;
+		bool multicast = is_multicast_ether_addr(skb->data);
+
+		if (multicast) {
+			xmit_skb = skb_copy(skb, GFP_ATOMIC);
+		} else if (sta_info_get(rx->sdata, skb->data)) {
+			xmit_skb = skb;
+			skb = NULL;
+		}
+
+		if (xmit_skb) {
+			/*
+			 * Send to wireless media and increase priority by 256
+			 * to keep the received priority instead of
+			 * reclassifying the frame (see cfg80211_classify8021d).
+			 */
+			xmit_skb->priority += 256;
+			xmit_skb->protocol = htons(ETH_P_802_3);
+			skb_reset_network_header(xmit_skb);
+			skb_reset_mac_header(xmit_skb);
+			dev_queue_xmit(xmit_skb);
+		}
+
+		if (!skb)
+			return true;
+	}
+
+	/* deliver to local stack */
+	skb->protocol = eth_type_trans(skb, fast_rx->dev);
+	memset(skb->cb, 0, sizeof(skb->cb));
+	if (rx->napi)
+		napi_gro_receive(rx->napi, skb);
+	else
+		netif_receive_skb(skb);
+
+	return true;
+ drop:
+	dev_kfree_skb(skb);
+	stats->dropped++;
+	return true;
+}
+
+/*
+ * This function returns whether or not the SKB
+ * was destined for RX processing or not, which,
+ * if consume is true, is equivalent to whether
+ * or not the skb was consumed.
+ */
+static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
+					    struct sk_buff *skb, bool consume)
+{
+	struct ieee80211_local *local = rx->local;
+	struct ieee80211_sub_if_data *sdata = rx->sdata;
+
+	rx->skb = skb;
+
+	/* See if we can do fast-rx; if we have to copy we already lost,
+	 * so punt in that case. We should never have to deliver a data
+	 * frame to multiple interfaces anyway.
+	 *
+	 * We skip the ieee80211_accept_frame() call and do the necessary
+	 * checking inside ieee80211_invoke_fast_rx().
+	 */
+	if (consume && rx->sta) {
+		struct ieee80211_fast_rx *fast_rx;
+
+		fast_rx = rcu_dereference(rx->sta->fast_rx);
+		if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
+			return true;
+	}
+
+	if (!ieee80211_accept_frame(rx))
+		return false;
+
+	if (!consume) {
+		skb = skb_copy(skb, GFP_ATOMIC);
+		if (!skb) {
+			if (net_ratelimit())
+				wiphy_debug(local->hw.wiphy,
+					"failed to copy skb for %s\n",
+					sdata->name);
+			return true;
+		}
+
+		rx->skb = skb;
+	}
+
+	ieee80211_invoke_rx_handlers(rx);
+	return true;
+}
+
+/*
+ * This is the actual Rx frames handler. as it belongs to Rx path it must
+ * be called with rcu_read_lock protection.
+ */
+static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
+					 struct ieee80211_sta *pubsta,
+					 struct sk_buff *skb,
+					 struct napi_struct *napi)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_hdr *hdr;
+	__le16 fc;
+	struct ieee80211_rx_data rx;
+	struct ieee80211_sub_if_data *prev;
+	struct rhlist_head *tmp;
+	int err = 0;
+
+	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
+	memset(&rx, 0, sizeof(rx));
+	rx.skb = skb;
+	rx.local = local;
+	rx.napi = napi;
+
+	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
+		I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
+
+	if (ieee80211_is_mgmt(fc)) {
+		/* drop frame if too short for header */
+		if (skb->len < ieee80211_hdrlen(fc))
+			err = -ENOBUFS;
+		else
+			err = skb_linearize(skb);
+	} else {
+		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
+	}
+
+	if (err) {
+		dev_kfree_skb(skb);
+		return;
+	}
+
+	hdr = (struct ieee80211_hdr *)skb->data;
+	ieee80211_parse_qos(&rx);
+	ieee80211_verify_alignment(&rx);
+
+	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
+		     ieee80211_is_beacon(hdr->frame_control)))
+		ieee80211_scan_rx(local, skb);
+
+	if (ieee80211_is_data(fc)) {
+		struct sta_info *sta, *prev_sta;
+
+		if (pubsta) {
+			rx.sta = container_of(pubsta, struct sta_info, sta);
+			rx.sdata = rx.sta->sdata;
+			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+				return;
+			goto out;
+		}
+
+		prev_sta = NULL;
+
+		for_each_sta_info(local, hdr->addr2, sta, tmp) {
+			if (!prev_sta) {
+				prev_sta = sta;
+				continue;
+			}
+
+			rx.sta = prev_sta;
+			rx.sdata = prev_sta->sdata;
+			ieee80211_prepare_and_rx_handle(&rx, skb, false);
+
+			prev_sta = sta;
+		}
+
+		if (prev_sta) {
+			rx.sta = prev_sta;
+			rx.sdata = prev_sta->sdata;
+
+			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+				return;
+			goto out;
+		}
+	}
+
+	prev = NULL;
+
+	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		if (!ieee80211_sdata_running(sdata))
+			continue;
+
+		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
+		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+			continue;
+
+		/*
+		 * frame is destined for this interface, but if it's
+		 * not also for the previous one we handle that after
+		 * the loop to avoid copying the SKB once too much
+		 */
+
+		if (!prev) {
+			prev = sdata;
+			continue;
+		}
+
+		rx.sta = sta_info_get_bss(prev, hdr->addr2);
+		rx.sdata = prev;
+		ieee80211_prepare_and_rx_handle(&rx, skb, false);
+
+		prev = sdata;
+	}
+
+	if (prev) {
+		rx.sta = sta_info_get_bss(prev, hdr->addr2);
+		rx.sdata = prev;
+
+		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+			return;
+	}
+
+ out:
+	dev_kfree_skb(skb);
+}
+
+/*
+ * This is the receive path handler. It is called by a low level driver when an
+ * 802.11 MPDU is received from the hardware.
+ */
+void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
+		       struct sk_buff *skb, struct napi_struct *napi)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct ieee80211_rate *rate = NULL;
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+
+	WARN_ON_ONCE(softirq_count() == 0);
+
+	if (WARN_ON(status->band >= NUM_NL80211_BANDS))
+		goto drop;
+
+	sband = local->hw.wiphy->bands[status->band];
+	if (WARN_ON(!sband))
+		goto drop;
+
+	/*
+	 * If we're suspending, it is possible although not too likely
+	 * that we'd be receiving frames after having already partially
+	 * quiesced the stack. We can't process such frames then since
+	 * that might, for example, cause stations to be added or other
+	 * driver callbacks be invoked.
+	 */
+	if (unlikely(local->quiescing || local->suspended))
+		goto drop;
+
+	/* We might be during a HW reconfig, prevent Rx for the same reason */
+	if (unlikely(local->in_reconfig))
+		goto drop;
+
+	/*
+	 * The same happens when we're not even started,
+	 * but that's worth a warning.
+	 */
+	if (WARN_ON(!local->started))
+		goto drop;
+
+	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
+		/*
+		 * Validate the rate, unless a PLCP error means that
+		 * we probably can't have a valid rate here anyway.
+		 */
+
+		switch (status->encoding) {
+		case RX_ENC_HT:
+			/*
+			 * rate_idx is MCS index, which can be [0-76]
+			 * as documented on:
+			 *
+			 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
+			 *
+			 * Anything else would be some sort of driver or
+			 * hardware error. The driver should catch hardware
+			 * errors.
+			 */
+			if (WARN(status->rate_idx > 76,
+				 "Rate marked as an HT rate but passed "
+				 "status->rate_idx is not "
+				 "an MCS index [0-76]: %d (0x%02x)\n",
+				 status->rate_idx,
+				 status->rate_idx))
+				goto drop;
+			break;
+		case RX_ENC_VHT:
+			if (WARN_ONCE(status->rate_idx > 11 ||
+				      !status->nss ||
+				      status->nss > 8,
+				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
+				      status->rate_idx, status->nss))
+				goto drop;
+			break;
+		case RX_ENC_HE:
+			if (WARN_ONCE(status->rate_idx > 11 ||
+				      !status->nss ||
+				      status->nss > 8,
+				      "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
+				      status->rate_idx, status->nss))
+				goto drop;
+			break;
+		default:
+			WARN_ON_ONCE(1);
+			/* fall through */
+		case RX_ENC_LEGACY:
+			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
+				goto drop;
+			rate = &sband->bitrates[status->rate_idx];
+		}
+	}
+
+	status->rx_flags = 0;
+
+	/*
+	 * key references and virtual interfaces are protected using RCU
+	 * and this requires that we are in a read-side RCU section during
+	 * receive processing
+	 */
+	rcu_read_lock();
+
+	/*
+	 * Frames with failed FCS/PLCP checksum are not returned,
+	 * all other frames are returned without radiotap header
+	 * if it was previously present.
+	 * Also, frames with less than 16 bytes are dropped.
+	 */
+	skb = ieee80211_rx_monitor(local, skb, rate);
+	if (!skb) {
+		rcu_read_unlock();
+		return;
+	}
+
+	ieee80211_tpt_led_trig_rx(local,
+			((struct ieee80211_hdr *)skb->data)->frame_control,
+			skb->len);
+
+	__ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
+
+	rcu_read_unlock();
+
+	return;
+ drop:
+	kfree_skb(skb);
+}
+EXPORT_SYMBOL(ieee80211_rx_napi);
+
+/* This is a version of the rx handler that can be called from hard irq
+ * context. Post the skb on the queue and schedule the tasklet */
+void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+
+	BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
+
+	skb->pkt_type = IEEE80211_RX_MSG;
+	skb_queue_tail(&local->skb_queue, skb);
+	tasklet_schedule(&local->tasklet);
+}
+EXPORT_SYMBOL(ieee80211_rx_irqsafe);