xref: /linux/net/mac80211/rx.c (revision d5a821f66047c2effd06147b84775f9b2ce0f4aa)

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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) 2018-2026 Intel Corporation
 */

#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/kcov.h>
#include <linux/bitops.h>
#include <kunit/visibility.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/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"

/*
 * monitor mode reception
 *
 * This function cleans up the SKB, i.e. it removes all the stuff
 * only useful for monitoring.
 */
static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
					   unsigned int present_fcs_len,
					   unsigned int rtap_space)
{
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr;
	unsigned int hdrlen;
	__le16 fc;

	if (present_fcs_len)
		__pskb_trim(skb, skb->len - present_fcs_len);
	pskb_pull(skb, rtap_space);

	/* After pulling radiotap header, clear all flags that indicate
	 * info in skb->data.
	 */
	status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END |
			  RX_FLAG_RADIOTAP_LSIG |
			  RX_FLAG_RADIOTAP_HE_MU |
			  RX_FLAG_RADIOTAP_HE |
			  RX_FLAG_RADIOTAP_VHT);

	hdr = (void *)skb->data;
	fc = hdr->frame_control;

	/*
	 * Remove the HT-Control field (if present) on management
	 * frames after we've sent the frame to monitoring. We
	 * (currently) don't need it, and don't properly parse
	 * frames with it present, due to the assumption of a
	 * fixed management header length.
	 */
	if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
		return skb;

	hdrlen = ieee80211_hdrlen(fc);
	hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);

	if (!pskb_may_pull(skb, hdrlen)) {
		dev_kfree_skb(skb);
		return NULL;
	}

	memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
		hdrlen - IEEE80211_HT_CTL_LEN);
	pskb_pull(skb, IEEE80211_HT_CTL_LEN);

	return skb;
}

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 |
			    RX_FLAG_NO_PSDU))
		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);

	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) {
		/* Included even if RX_FLAG_RADIOTAP_VHT is not set */
		len = ALIGN(len, 2);
		len += 12;
		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_vht) != 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->flag & RX_FLAG_NO_PSDU)
		len += 1;

	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
		len = ALIGN(len, 2);
		len += 4;
		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
	}

	if (status->chains) {
		/* antenna and antenna signal fields */
		len += 2 * hweight8(status->chains);
	}

	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
		int tlv_offset = 0;

		/*
		 * The position to look at depends on the existence (or non-
		 * existence) of other elements, so take that into account...
		 */
		if (status->flag & RX_FLAG_RADIOTAP_VHT)
			tlv_offset +=
				sizeof(struct ieee80211_radiotap_vht);
		if (status->flag & RX_FLAG_RADIOTAP_HE)
			tlv_offset +=
				sizeof(struct ieee80211_radiotap_he);
		if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
			tlv_offset +=
				sizeof(struct ieee80211_radiotap_he_mu);
		if (status->flag & RX_FLAG_RADIOTAP_LSIG)
			tlv_offset +=
				sizeof(struct ieee80211_radiotap_lsig);

		/* ensure 4 byte alignment for TLV */
		len = ALIGN(len, 4);

		/* TLVs until the mac header */
		len += skb_mac_header(skb) - &skb->data[tlv_offset];
	}

	return len;
}

static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
					   int link_id,
					   struct sta_info *sta,
					   struct sk_buff *skb)
{
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

	if (link_id >= 0) {
		status->link_valid = 1;
		status->link_id = link_id;
	} else {
		status->link_valid = 0;
	}

	skb_queue_tail(&sdata->skb_queue, skb);
	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
	if (sta) {
		struct link_sta_info *link_sta_info;

		if (link_id >= 0) {
			link_sta_info = rcu_dereference(sta->link[link_id]);
			if (!link_sta_info)
				return;
		} else {
			link_sta_info = &sta->deflink;
		}

		link_sta_info->rx_stats.packets++;
	}
}

static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
					 int link_id,
					 struct sta_info *sta,
					 struct sk_buff *skb)
{
	skb->protocol = 0;
	__ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
}

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(action_code));

	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;

	ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
}

/*
 * 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;
	u32 tlvs_len = 0;
	int mpdulen, chain;
	unsigned long chains = status->chains;
	struct ieee80211_radiotap_vht vht = {};
	struct ieee80211_radiotap_he he = {};
	struct ieee80211_radiotap_he_mu he_mu = {};
	struct ieee80211_radiotap_lsig lsig = {};

	if (status->flag & RX_FLAG_RADIOTAP_VHT) {
		vht = *(struct ieee80211_radiotap_vht *)skb->data;
		skb_pull(skb, sizeof(vht));
		WARN_ON_ONCE(status->encoding != RX_ENC_VHT);
	}

	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_LSIG) {
		lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
		skb_pull(skb, sizeof(lsig));
	}

	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
		/* data is pointer at tlv all other info was pulled off */
		tlvs_len = skb_mac_header(skb) - skb->data;
	}

	mpdulen = skb->len;
	if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
		mpdulen += FCS_LEN;

	rthdr = skb_push(skb, rtap_len - tlvs_len);
	memset(rthdr, 0, rtap_len - tlvs_len);
	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_TLV_AT_END)
		it_present_val |= BIT(IEEE80211_RADIOTAP_TLV);

	put_unaligned_le32(it_present_val, it_present);

	/* This references through an offset into it_optional[] rather
	 * than via it_present otherwise later uses of pos will cause
	 * the compiler to think we have walked past the end of the
	 * struct member.
	 */
	pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];

	/* 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->hw, status,
							 mpdulen, 0),
			pos);
		rthdr->it_present |= cpu_to_le32(BIT(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(BIT(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 */
	/* TODO: frequency offset in KHz */
	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 ||
	    status->band == NL80211_BAND_6GHZ)
		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(BIT(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(BIT(IEEE80211_RADIOTAP_MCS));
		*pos = local->hw.radiotap_mcs_details;
		if (status->enc_flags & RX_ENC_FLAG_HT_GF)
			*pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
		if (status->enc_flags & RX_ENC_FLAG_LDPC)
			*pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
		pos++;
		*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(BIT(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_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;
		*pos++ = 0;
		*pos++ = 0;
	}

	if (status->encoding == RX_ENC_VHT) {
		u16 fill = local->hw.radiotap_vht_details;

		/* Leave driver filled fields alone */
		fill &= ~le16_to_cpu(vht.known);
		vht.known |= cpu_to_le16(fill);

		if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_GI &&
		    status->enc_flags & RX_ENC_FLAG_SHORT_GI)
			vht.flags |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
		/* in VHT, STBC is binary */
		if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_STBC &&
		    status->enc_flags & RX_ENC_FLAG_STBC_MASK)
			vht.flags |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
		if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED &&
		    status->enc_flags & RX_ENC_FLAG_BF)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;

		if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
			switch (status->bw) {
			case RATE_INFO_BW_40:
				vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_40;
				break;
			case RATE_INFO_BW_80:
				vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_80;
				break;
			case RATE_INFO_BW_160:
				vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_160;
				break;
			default:
				vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_20;
				break;
			}
		}

		/*
		 * If the driver filled in mcs_nss[0], then do not touch it.
		 *
		 * Otherwise, put some information about MCS/NSS into the
		 * user 0 field. Note that this is not technically correct for
		 * an MU frame as we might have decoded a different user.
		 */
		if (!vht.mcs_nss[0]) {
			vht.mcs_nss[0] = (status->rate_idx << 4) | status->nss;

			/* coding field */
			if (status->enc_flags & RX_ENC_FLAG_LDPC)
				vht.coding |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
		}

		/* ensure 2 byte alignment */
		while ((pos - (u8 *)rthdr) & 1)
			pos++;
		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
		memcpy(pos, &vht, sizeof(vht));
		pos += sizeof(vht);
	}

	if (local->hw.radiotap_timestamp.units_pos >= 0) {
		u16 accuracy = 0;
		u8 flags;
		u64 ts;

		rthdr->it_present |=
			cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));

		/* ensure 8 byte alignment */
		while ((pos - (u8 *)rthdr) & 7)
			pos++;

		if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) {
			flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT;
			ts = status->mactime;
		} else {
			flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
			ts = status->device_timestamp;
		}

		put_unaligned_le64(ts, 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)	le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)

		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(BIT(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(BIT(IEEE80211_RADIOTAP_HE_MU));
		memcpy(pos, &he_mu, sizeof(he_mu));
		pos += sizeof(he_mu);
	}

	if (status->flag & RX_FLAG_NO_PSDU) {
		rthdr->it_present |=
			cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
		*pos++ = status->zero_length_psdu_type;
	}

	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
		/* ensure 2 byte alignment */
		while ((pos - (u8 *)rthdr) & 1)
			pos++;
		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
		memcpy(pos, &lsig, sizeof(lsig));
		pos += sizeof(lsig);
	}

	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		*pos++ = status->chain_signal[chain];
		*pos++ = chain;
	}
}

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 + NET_SKB_PAD,
				      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;
}

static bool
ieee80211_validate_monitor_radio(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_local *local,
				 struct ieee80211_rx_status *status)
{
	struct wiphy *wiphy = local->hw.wiphy;
	int i, freq, bw;

	if (!wiphy->n_radio)
		return true;

	switch (status->bw) {
	case RATE_INFO_BW_20:
		bw = 20000;
		break;
	case RATE_INFO_BW_40:
		bw = 40000;
		break;
	case RATE_INFO_BW_80:
		bw = 80000;
		break;
	case RATE_INFO_BW_160:
		bw = 160000;
		break;
	case RATE_INFO_BW_320:
		bw = 320000;
		break;
	default:
		return false;
	}

	freq = MHZ_TO_KHZ(status->freq);

	for (i = 0; i < wiphy->n_radio; i++) {
		if (!(sdata->wdev.radio_mask & BIT(i)))
			continue;

		if (!ieee80211_radio_freq_range_valid(&wiphy->radio[i], freq, bw))
			continue;

		return true;
	}
	return false;
}

/*
 * 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, *prev_sdata = NULL;
	struct sk_buff *skb, *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;
	unsigned int min_head_len;

	if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END &&
			 !skb_mac_header_was_set(origskb))) {
		/* with this skb no way to know where frame payload starts */
		dev_kfree_skb(origskb);
		return NULL;
	}

	if (status->flag & RX_FLAG_RADIOTAP_VHT)
		rtap_space += sizeof(struct ieee80211_radiotap_vht);

	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 (status->flag & RX_FLAG_RADIOTAP_LSIG)
		rtap_space += sizeof(struct ieee80211_radiotap_lsig);

	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
		rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space];

	min_head_len = rtap_space;

	/*
	 * 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 (!(status->flag & RX_FLAG_NO_PSDU)) {
		if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
			if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
				/* driver bug */
				WARN_ON(1);
				dev_kfree_skb(origskb);
				return NULL;
			}
			present_fcs_len = FCS_LEN;
		}

		/* also consider the hdr->frame_control */
		min_head_len += 2;
	}

	/* ensure that the expected data elements are in skb head */
	if (!pskb_may_pull(origskb, min_head_len)) {
		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;
		}

		return ieee80211_clean_skb(origskb, present_fcs_len,
					   rtap_space);
	}

	ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);

	list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
		struct cfg80211_chan_def *chandef;

		chandef = &sdata->vif.bss_conf.chanreq.oper;
		if (chandef->chan &&
		    chandef->chan->center_freq != status->freq)
			continue;

		if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR) &&
		    !ieee80211_validate_monitor_radio(sdata, local, status))
			continue;

		if (!prev_sdata) {
			prev_sdata = sdata;
			continue;
		}

		if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
			ieee80211_handle_mu_mimo_mon(sdata, origskb, rtap_space);

		if (!monskb)
			monskb = ieee80211_make_monitor_skb(local, &origskb,
							    rate, rtap_space,
							    false);
		if (!monskb)
			continue;

		skb = skb_clone(monskb, GFP_ATOMIC);
		if (!skb)
			continue;

		skb->dev = prev_sdata->dev;
		dev_sw_netstats_rx_add(skb->dev, skb->len);
		netif_receive_skb(skb);
		prev_sdata = sdata;
	}

	if (prev_sdata) {
		if (monskb)
			skb = monskb;
		else
			skb = ieee80211_make_monitor_skb(local, &origskb,
							 rate, rtap_space,
							 only_monitor);
		if (skb) {
			skb->dev = prev_sdata->dev;
			dev_sw_netstats_rx_add(skb->dev, skb->len);
			netif_receive_skb(skb);
		}
	}

	if (!origskb)
		return NULL;

	return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
}

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, they 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) &&
	    !ieee80211_is_beacon(hdr->frame_control))
		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_keyid(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
	int hdrlen = ieee80211_hdrlen(fc);
	u8 keyid;

	/* WEP, TKIP, CCMP and GCMP */
	if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
		return -EINVAL;

	skb_copy_bits(skb, hdrlen + 3, &keyid, 1);

	keyid >>= 6;

	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_U_MESH_DS_BITS;
			if (ether_addr_equal(hdr->addr3, dev_addr))
				return RX_DROP_U_MESH_A3_MISMATCH;
		} else {
			if (!ieee80211_has_a4(hdr->frame_control))
				return RX_DROP_U_MESH_NO_A4;
			if (ether_addr_equal(hdr->addr4, dev_addr))
				return RX_DROP_U_MESH_A4_MISMATCH;
		}
	}

	/* 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_U_MESH_UNEXP_DATA;

		if (ieee80211_is_action(hdr->frame_control)) {
			u8 category;

			/* make sure category field is present */
			if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category))
				return RX_DROP_U_RUNT_ACTION;

			mgmt = (struct ieee80211_mgmt *)hdr;
			category = mgmt->u.action.category;
			if (category != WLAN_CATEGORY_MESH_ACTION &&
			    category != WLAN_CATEGORY_SELF_PROTECTED)
				return RX_DROP_U_MESH_WRONG_ACTION;
			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_U_MESH_UNEXP_MGMT;
	}

	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[index].buf;
	struct sk_buff *tail = skb_peek_tail(frames);
	struct ieee80211_rx_status *status;

	if (tid_agg_rx->reorder_buf_filtered &&
	    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[index].buf;
	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:
	if (tid_agg_rx->reorder_buf_filtered)
		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[j].time +
					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[i].buf);

			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[j].time + 1 +
				  HT_RX_REORDER_BUF_TIMEOUT);
	} else {
		timer_delete(&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 mpdu_seq_num = ieee80211_get_sn(hdr);
	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[index].buf, skb);
	if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
		tid_agg_rx->reorder[index].time = 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_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,
					     ieee80211_s1g_use_ndp_ba(rx->sdata,
								      rx->sta));
		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) {
		ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
		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;

	if (ieee80211_is_ext(hdr->frame_control))
		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))
		return RX_CONTINUE;

	if (!rx->sta)
		return RX_CONTINUE;

	if (unlikely(is_multicast_ether_addr(hdr->addr1))) {
		struct ieee80211_sub_if_data *sdata = rx->sdata;
		u16 sn = ieee80211_get_sn(hdr);

		if (!ieee80211_is_data_present(hdr->frame_control))
			return RX_CONTINUE;

		if (!ieee80211_vif_is_mld(&sdata->vif) ||
		    sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_CONTINUE;

		if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO &&
		    ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last))
			return RX_DROP_U_DUP;

		sdata->u.mgd.mcast_seq_last = sn;
		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->link_sta->rx_stats.num_duplicates++;
		return RX_DROP_U_DUP;
	} 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);

	/*
	 * Wi-Fi Aware (TM) 4.0 specification 6.2.5:
	 * For NAN_DATA, unicast data frames must have A2 (source)
	 * assigned to an active NDP. If not the frame must be dropped
	 * and NAN Data Path termination frame should be sent. Notify
	 * user space so it can do so.
	 */
	if (rx->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) {
		if (ieee80211_is_data(hdr->frame_control) &&
		    !is_multicast_ether_addr(hdr->addr1) &&
		    (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) {
			if (cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2,
						       rx->link_id, GFP_ATOMIC))
				return RX_DROP_U_SPURIOUS_NOTIF;
			return RX_DROP_U_SPURIOUS;
		}
		return RX_CONTINUE;
	}

	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_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_U_RUNT_DATA;

			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,
					       rx->link_id, GFP_ATOMIC))
			return RX_DROP_U_SPURIOUS_NOTIF;

		return RX_DROP_U_SPURIOUS;
	}

	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);

	for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
		struct ieee80211_txq *txq = sta->sta.txq[tid];
		struct txq_info *txqi = to_txq_info(txq);

		spin_lock(&local->active_txq_lock[txq->ac]);
		if (!list_empty(&txqi->schedule_order))
			list_del_init(&txqi->schedule_order);
		spin_unlock(&local->active_txq_lock[txq->ac]);

		if (txq_has_queue(txq))
			set_bit(tid, &sta->txq_buffered_tids);
		else
			clear_bit(tid, &sta->txq_buffered_tids);
	}

	sta_info_recalc_tim(sta);
}

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 link_sta_info *link_sta = rx->link_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 || !link_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)) {
			link_sta->rx_stats.last_rx = jiffies;
			if (ieee80211_is_data_present(hdr->frame_control) &&
			    !is_multicast_ether_addr(hdr->addr1))
				link_sta->rx_stats.last_rate =
					sta_stats_encode_rate(status);
		}
	} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
		link_sta->rx_stats.last_rx = jiffies;
	} else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
		   !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.
		 */
		link_sta->rx_stats.last_rx = jiffies;
		if (ieee80211_is_data_present(hdr->frame_control))
			link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
	}

	link_sta->rx_stats.fragments++;

	u64_stats_update_begin(&link_sta->rx_stats.syncp);
	u64_stats_add(&link_sta->rx_stats.bytes, rx->skb->len);
	u64_stats_update_end(&link_sta->rx_stats.syncp);

	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
		link_sta->rx_stats.last_signal = status->signal;
		ewma_signal_add(&link_sta->rx_stats_avg.signal,
				-status->signal);
	}

	if (status->chains) {
		link_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;

			link_sta->rx_stats.chain_signal_last[i] = signal;
			ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
					-signal);
		}
	}

	if (ieee80211_is_s1g_beacon(hdr->frame_control))
		return RX_CONTINUE;

	/*
	 * 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,
					rx->link_id, GFP_ATOMIC);
			return RX_DROP_U_UNEXPECTED_4ADDR_FRAME;
		}
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
		link_sta->rx_stats.packets++;
		dev_kfree_skb(rx->skb);
		return RX_QUEUED;
	}

	return RX_CONTINUE;
} /* ieee80211_rx_h_sta_process */

static struct ieee80211_key *
ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
{
	struct ieee80211_key *key = NULL;
	int idx2;

	/* Make sure key gets set if either BIGTK key index is set so that
	 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
	 * Beacon frames and Beacon frames that claim to use another BIGTK key
	 * index (i.e., a key that we do not have).
	 */

	if (idx < 0) {
		idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
		idx2 = idx + 1;
	} else {
		if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
			idx2 = idx + 1;
		else
			idx2 = idx - 1;
	}

	if (rx->link_sta)
		key = rcu_dereference(rx->link_sta->gtk[idx]);
	if (!key)
		key = rcu_dereference(rx->link->gtk[idx]);
	if (!key && rx->link_sta)
		key = rcu_dereference(rx->link_sta->gtk[idx2]);
	if (!key)
		key = rcu_dereference(rx->link->gtk[idx2]);

	return key;
}

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;
	ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL;
	struct ieee80211_key *sta_ptk = NULL;
	struct ieee80211_key *ptk_idx = NULL;
	int mmie_keyidx = -1;
	__le16 fc;

	if (ieee80211_is_ext(hdr->frame_control))
		return RX_CONTINUE;

	/*
	 * Key selection 101
	 *
	 * There are five types of keys:
	 *  - GTK (group keys)
	 *  - IGTK (group keys for management frames)
	 *  - BIGTK (group keys for Beacon 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, IGTKs, and
	 * BIGTKs. 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;
		sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);

		if (ieee80211_has_protected(fc) &&
		    !(status->flag & RX_FLAG_IV_STRIPPED)) {
			keyid = ieee80211_get_keyid(rx->skb);

			if (unlikely(keyid < 0))
				return RX_DROP_U_NO_KEY_ID;

			ptk_idx = 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 = ptk_idx ? ptk_idx : 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 && ieee80211_is_beacon(fc)) {
		/* 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 + NUM_DEFAULT_MGMT_KEYS ||
		    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
				   NUM_DEFAULT_BEACON_KEYS) {
			if (rx->sdata->dev)
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     skb->data,
							     skb->len);
			return RX_DROP_U_BAD_BCN_KEYIDX;
		}

		rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
		if (!rx->key)
			return RX_CONTINUE; /* Beacon protection not in use */
	} 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_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
		if (rx->link_sta) {
			if (ieee80211_is_group_privacy_action(skb) &&
			    test_sta_flag(rx->sta, WLAN_STA_MFP))
				return RX_DROP_U_UNPROTECTED;

			rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
		}
		if (!rx->key)
			rx->key = rcu_dereference(rx->link->gtk[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;
		int i;

		if (ieee80211_is_beacon(fc)) {
			key = ieee80211_rx_get_bigtk(rx, -1);
		} else if (ieee80211_is_mgmt(fc) &&
			   is_multicast_ether_addr(hdr->addr1)) {
			key = rcu_dereference(rx->link->default_mgmt_key);
		} else {
			if (rx->link_sta) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(rx->link_sta->gtk[i]);
					if (key)
						break;
				}
			}
			if (!key) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(rx->link->gtk[i]);
					if (key)
						break;
				}
			}
		}
		if (key)
			rx->key = key;
		return RX_CONTINUE;
	} else {
		/*
		 * 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;

		keyidx = ieee80211_get_keyid(rx->skb);

		if (unlikely(keyidx < 0))
			return RX_DROP_U_NO_KEY_ID;

		/* check per-station GTK first, if multicast packet */
		if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
			rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);

		/* if not found, try default key */
		if (!rx->key) {
			if (is_multicast_ether_addr(hdr->addr1))
				rx->key = rcu_dereference(rx->link->gtk[keyidx]);
			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_U_KEY_TAINTED;

		/* TODO: add threshold stuff again */
	} else {
		return RX_DROP_U_UNPROTECTED;
	}

	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, IEEE80211_CMAC_128_MIC_LEN);
		break;
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		result = ieee80211_crypto_aes_cmac_decrypt(
			rx, IEEE80211_CMAC_256_MIC_LEN);
		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 = RX_DROP_U_BAD_CIPHER;
	}

	/* the hdr variable is invalid after the decrypt handlers */

	/* either the frame has been decrypted or will be dropped */
	status->flag |= RX_FLAG_DECRYPTED;

	if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
		     rx->sdata->dev))
		cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
					     skb->data, skb->len);

	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;
		struct sk_buff *f_skb;

		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_skb = __skb_peek(&entry->skb_list);
		f_hdr = (struct ieee80211_hdr *) f_skb->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) || ieee80211_is_ext(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_U_MCAST_FRAGMENT;

	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

	if (skb_linearize(rx->skb))
		return RX_DROP_U_OOM;

	/*
	 *  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_U_DEFRAG_MISMATCH;
	}

	/* "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_U_NONSEQ_PN;

		/* Prevent mixed key and fragment cache attacks */
		if (entry->key_color != rx->key->color)
			return RX_DROP_U_BAD_KEY_COLOR;

		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_U_REPLAY;
		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_U_EXPECT_DEFRAG_PROT;
	} else if (entry->is_protected && rx->key &&
		   entry->key_color != rx->key->color &&
		   (status->flag & RX_FLAG_DECRYPTED)) {
		return RX_DROP_U_BAD_KEY_COLOR;
	}

	skb_pull(rx->skb, ieee80211_hdrlen(fc));
	if (unlikely((u32)entry->extra_len + rx->skb->len > U16_MAX)) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
		__skb_queue_purge(&entry->skb_list);
		return RX_DROP_U_DEFRAG_OVERFLOW;
	}

	__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_U_OOM;
		}
	}
	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->link_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 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;

	/* 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;
}

VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result
ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 fc = mgmt->frame_control;

	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return RX_CONTINUE;

	/* drop unicast protected dual (that wasn't protected) */
	if (ieee80211_is_action(fc) &&
	    mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
		return RX_DROP_U_UNPROT_DUAL;

	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))) {
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc)) {
				/*
				 * Permit unprotected deauth/disassoc frames
				 * during 4-way-HS (key is installed after HS).
				 */
				if (!rx->key)
					return RX_CONTINUE;

				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
			}
			return RX_DROP_U_UNPROT_UCAST_MGMT;
		}
		/* 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 RX_DROP_U_UNPROT_MCAST_MGMT;
		}
		if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
			cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
						     rx->skb->data,
						     rx->skb->len);
			return RX_DROP_U_UNPROT_BEACON;
		}
		/*
		 * 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 RX_DROP_U_UNPROT_ACTION;

		/* drop unicast public action frames when using MPF */
		if (is_unicast_ether_addr(mgmt->da) &&
		    ieee80211_is_protected_dual_of_public_action(rx->skb))
			return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION;
	}

	/*
	 * Drop robust action frames before assoc regardless of MFP state,
	 * after assoc we also have decided on MFP or not.
	 */
	if (ieee80211_is_action(fc) &&
	    ieee80211_is_robust_mgmt_frame(rx->skb) &&
	    (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))
		return RX_DROP_U_UNPROT_ROBUST_ACTION;

	/*
	 * Drop unprotected (Re)Association Request/Response frame received from
	 * an EPP Peer.
	 */
	if (!ieee80211_has_protected(fc) &&
	    ieee80211_require_encrypted_assoc(fc, rx->sta))
		return RX_DROP_U_UNPROT_UCAST_MGMT;

	return RX_CONTINUE;
}
EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt);

static ieee80211_rx_result
__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 RX_DROP_U_UNEXPECTED_VLAN_4ADDR;

	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 RX_DROP_U_UNEXPECTED_STA_4ADDR;
		else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
			check_port_control = true;
	}

	if (is_multicast_ether_addr(hdr->addr1) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
		return RX_DROP_U_UNEXPECTED_VLAN_MCAST;

	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
	if (ret < 0)
		return RX_DROP_U_INVALID_8023;

	ehdr = (struct ethhdr *) rx->skb->data;
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
		return RX_DROP_U_NOT_PORT_CONTROL;

	return RX_CONTINUE;
}

bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
			   const u8 *addr, int *out_link_id)
{
	unsigned int link_id;

	/* non-MLO, or MLD address replaced by hardware */
	if (ether_addr_equal(sdata->vif.addr, addr))
		return true;

	if (!ieee80211_vif_is_mld(&sdata->vif))
		return false;

	for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
		struct ieee80211_bss_conf *conf;

		conf = rcu_dereference(sdata->vif.link_conf[link_id]);

		if (!conf)
			continue;
		if (ether_addr_equal(conf->addr, addr)) {
			if (out_link_id)
				*out_link_id = link_id;
			return true;
		}
	}

	return false;
}

/*
 * 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 ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
		       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_no_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, rx->link_id);
		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, unless the hardware allowed them
		 * through in 802.3 offloaded mode.
		 */
		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->list)
			list_add_tail(&skb->list, rx->list);
		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;

	dev_sw_netstats_rx_add(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->link_sta->rx_stats.syncp);
		u64_stats_inc(&rx->link_sta->rx_stats.msdu[rx->seqno_idx]);
		u64_stats_update_end(&rx->link_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) &&
			   !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
			dsta = sta_info_get(sdata, ehdr->h_dest);
			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);
	}
}

#ifdef CONFIG_MAC80211_MESH
static bool
ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
			       struct sk_buff *skb, int hdrlen)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_mesh_fast_tx_key key = {
		.type = MESH_FAST_TX_TYPE_FORWARDED
	};
	struct ieee80211_mesh_fast_tx *entry;
	struct ieee80211s_hdr *mesh_hdr;
	struct tid_ampdu_tx *tid_tx;
	struct sta_info *sta;
	struct ethhdr eth;
	u8 tid;

	mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
	if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
		ether_addr_copy(key.addr, mesh_hdr->eaddr1);
	else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
		ether_addr_copy(key.addr, skb->data);
	else
		return false;

	entry = mesh_fast_tx_get(sdata, &key);
	if (!entry)
		return false;

	sta = rcu_dereference(entry->mpath->next_hop);
	if (!sta)
		return false;

	if (skb_linearize(skb))
		return false;

	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
	if (tid_tx) {
		if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
			return false;

		if (tid_tx->timeout)
			tid_tx->last_tx = jiffies;
	}

	ieee80211_aggr_check(sdata, sta, skb);

	if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
					    &skb->protocol))
		hdrlen += ETH_ALEN;
	else
		skb->protocol = htons(skb->len - hdrlen);
	skb_set_network_header(skb, hdrlen + 2);

	skb->dev = sdata->dev;
	memcpy(&eth, skb->data, ETH_HLEN - 2);
	skb_pull(skb, 2);
	__ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
			      eth.h_dest, eth.h_source);
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);

	return true;
}
#endif

static ieee80211_rx_result
ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
		       struct sk_buff *skb)
{
#ifdef CONFIG_MAC80211_MESH
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_local *local = sdata->local;
	uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
	struct ieee80211_hdr hdr = {
		.frame_control = cpu_to_le16(fc)
	};
	struct ieee80211_hdr *fwd_hdr;
	struct ieee80211s_hdr *mesh_hdr;
	struct ieee80211_tx_info *info;
	struct sk_buff *fwd_skb;
	struct ethhdr *eth;
	bool multicast;
	int tailroom = 0;
	int hdrlen, mesh_hdrlen;
	u8 *qos;

	if (!ieee80211_vif_is_mesh(&sdata->vif))
		return RX_CONTINUE;

	if (!pskb_may_pull(skb, sizeof(*eth) + 6))
		return RX_DROP_U_RUNT_MESH_DATA;

	mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
	mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);

	if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
		return RX_DROP_U_RUNT_MESH_DATA;

	eth = (struct ethhdr *)skb->data;
	multicast = is_multicast_ether_addr(eth->h_dest);

	mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
	if (!mesh_hdr->ttl)
		return RX_DROP_U_MESH_NO_TTL;

	/* frame is in RMC, don't forward */
	if (is_multicast_ether_addr(eth->h_dest) &&
	    mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
		return RX_DROP_U_MESH_RMC;

	/* forward packet */
	if (sdata->crypto_tx_tailroom_needed_cnt)
		tailroom = IEEE80211_ENCRYPT_TAILROOM;

	if (mesh_hdr->flags & MESH_FLAGS_AE) {
		struct mesh_path *mppath;
		char *proxied_addr;
		bool update = false;

		if (multicast)
			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 */
			proxied_addr = mesh_hdr->eaddr2;
		else
			return RX_DROP_U_MESH_BAD_AE;

		rcu_read_lock();
		mppath = mpp_path_lookup(sdata, proxied_addr);
		if (!mppath) {
			mpp_path_add(sdata, proxied_addr, eth->h_source);
		} else {
			spin_lock_bh(&mppath->state_lock);
			if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
				memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
				update = true;
			}
			mppath->exp_time = jiffies;
			spin_unlock_bh(&mppath->state_lock);
		}

		/* flush fast xmit cache if the address path changed */
		if (update)
			mesh_fast_tx_flush_addr(sdata, proxied_addr);

		rcu_read_unlock();
	}

	/* Frame has reached destination.  Don't forward */
	if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
		goto rx_accept;

	if (!--mesh_hdr->ttl) {
		if (multicast)
			goto rx_accept;

		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
		return RX_DROP_U_MESH_TTL_EXPIRED;
	}

	if (!ifmsh->mshcfg.dot11MeshForwarding) {
		if (is_multicast_ether_addr(eth->h_dest))
			goto rx_accept;

		return RX_DROP_U_MESH_NOT_FORWARDING;
	}

	skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);

	if (!multicast &&
	    ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
		return RX_QUEUED;

	ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
				      eth->h_dest, eth->h_source);
	hdrlen = ieee80211_hdrlen(hdr.frame_control);
	if (multicast) {
		int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);

		fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
					       IEEE80211_ENCRYPT_HEADROOM,
					  tailroom, GFP_ATOMIC);
		if (!fwd_skb)
			goto rx_accept;
	} else {
		fwd_skb = skb;
		skb = NULL;

		if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
			return RX_DROP_U_OOM;

		if (skb_linearize(fwd_skb))
			return RX_DROP_U_OOM;
	}

	fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
	memcpy(fwd_hdr, &hdr, hdrlen - 2);
	qos = ieee80211_get_qos_ctl(fwd_hdr);
	qos[0] = qos[1] = 0;

	skb_reset_mac_header(fwd_skb);
	hdrlen += mesh_hdrlen;
	if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
					    &fwd_skb->protocol))
		hdrlen += ETH_ALEN;
	else
		fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
	skb_set_network_header(fwd_skb, hdrlen + 2);

	info = IEEE80211_SKB_CB(fwd_skb);
	memset(info, 0, sizeof(*info));
	info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
	info->control.vif = &sdata->vif;
	info->control.jiffies = jiffies;
	fwd_skb->dev = sdata->dev;
	if (multicast) {
		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 */
		if (sta)
			mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
					   hdr.addr3, 0,
					   WLAN_REASON_MESH_PATH_NOFORWARD,
					   sta->sta.addr);
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
		kfree_skb(fwd_skb);
		goto rx_accept;
	}

	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_set_qos_hdr(sdata, fwd_skb);
	ieee80211_add_pending_skb(local, fwd_skb);

rx_accept:
	if (!skb)
		return RX_QUEUED;

	ieee80211_strip_8023_mesh_hdr(skb);
#endif

	return RX_CONTINUE;
}

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 (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
				check_sa = NULL;
			break;
		case NL80211_IFTYPE_MESH_POINT:
			check_sa = NULL;
			check_da = 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_U_BAD_AMSDU;

	if (rx->sta->amsdu_mesh_control < 0) {
		s8 valid = -1;
		int i;

		for (i = 0; i <= 2; i++) {
			if (!ieee80211_is_valid_amsdu(skb, i))
				continue;

			if (valid >= 0) {
				/* ambiguous */
				valid = -1;
				break;
			}

			valid = i;
		}

		rx->sta->amsdu_mesh_control = valid;
	}

	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
				 rx->local->hw.extra_tx_headroom,
				 check_da, check_sa,
				 rx->sta->amsdu_mesh_control);

	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);

		switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) {
		case RX_QUEUED:
			break;
		case RX_CONTINUE:
			if (ieee80211_frame_allowed(rx, fc)) {
				ieee80211_deliver_skb(rx);
				break;
			}
			fallthrough;
		default:
			dev_kfree_skb(rx->skb);
		}
	}

	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_U_AMSDU_WITHOUT_DATA;

	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_U_BAD_4ADDR;
			break;
		case NL80211_IFTYPE_STATION:
			if (!rx->sdata->u.mgd.use_4addr)
				return RX_DROP_U_BAD_4ADDR;
			break;
		case NL80211_IFTYPE_MESH_POINT:
			break;
		default:
			return RX_DROP_U_BAD_4ADDR;
		}
	}

	if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
		return RX_DROP_U_BAD_AMSDU;

	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_U_BAD_AMSDU_CIPHER;
		default:
			break;
		}
	}

	return __ieee80211_rx_h_amsdu(rx, 0);
}

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;
	ieee80211_rx_result res;
	bool port_control;

	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
		return RX_CONTINUE;

	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
		return RX_DROP_U_NULL_DATA;

	/* Send unexpected-4addr-frame event to hostapd */
	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, rx->link_id,
				GFP_ATOMIC);
		return RX_DROP_U_UNEXPECTED_4ADDR;
	}

	res = __ieee80211_data_to_8023(rx, &port_control);
	if (unlikely(res != RX_CONTINUE))
		return res;

	res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
	if (res != RX_CONTINUE)
		return res;

	if (!ieee80211_frame_allowed(rx, fc))
		return RX_DROP_U_PORT_CONTROL;

	/* 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)) {
			rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
			__ieee80211_queue_skb_to_iface(sdata, rx->link_id,
						       rx->sta, rx->skb);
			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_U_UNKNOWN_STA;

		if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
				  &bar_data, sizeof(bar_data)))
			return RX_DROP_U_RUNT_BAR;

		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,
					     ieee80211_s1g_use_ndp_ba(rx->sdata,
								      rx->sta));

		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
			return RX_DROP_U_BAR_OUTSIDE_SESSION;

		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;
	}

	return RX_DROP_U_CTRL_FRAME;
}

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->vif.cfg.ap_addr) ||
	    !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) {
		/* Not from the current AP or not associated yet. */
		return;
	}

	if (len < IEEE80211_MIN_ACTION_SIZE(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, IEEE80211_MIN_ACTION_SIZE(sa_query));
	memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);
	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);
	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
	resp->u.action.action_code = WLAN_ACTION_SA_QUERY_RESPONSE;
	memcpy(resp->u.action.sa_query.trans_id,
	       mgmt->u.action.sa_query.trans_id,
	       WLAN_SA_QUERY_TR_ID_LEN);

	ieee80211_tx_skb(sdata, skb);
}

static void
ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
{
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	struct ieee80211_bss_conf *bss_conf;
	const struct element *ie;
	size_t baselen;

	if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
				     NL80211_EXT_FEATURE_BSS_COLOR))
		return;

	if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
		return;

	bss_conf = rx->link->conf;
	if (bss_conf->csa_active || bss_conf->color_change_active ||
	    !bss_conf->he_bss_color.enabled)
		return;

	baselen = mgmt->u.beacon.variable - rx->skb->data;
	if (baselen > rx->skb->len)
		return;

	ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
				    mgmt->u.beacon.variable,
				    rx->skb->len - baselen);
	if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
	    ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
		const struct ieee80211_he_operation *he_oper;
		u8 color;

		he_oper = (void *)(ie->data + 1);
		if (le32_get_bits(he_oper->he_oper_params,
				  IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
			return;

		color = le32_get_bits(he_oper->he_oper_params,
				      IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
		if (color == bss_conf->he_bss_color.color)
			ieee80211_obss_color_collision_notify(&rx->sdata->vif,
							      BIT_ULL(color),
							      bss_conf->link_id);
	}
}

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);

	if (ieee80211_is_s1g_beacon(mgmt->frame_control))
		return RX_CONTINUE;

	/*
	 * 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_U_RUNT_MGMT;

	if (!ieee80211_is_mgmt(mgmt->frame_control))
		return RX_DROP_U_EXPECTED_MGMT;

	/* drop too small action frames */
	if (ieee80211_is_action(mgmt->frame_control) &&
	    rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category))
		return RX_DROP_U_RUNT_ACTION;

	/* Drop non-broadcast Beacon frames */
	if (ieee80211_is_beacon(mgmt->frame_control) &&
	    !is_broadcast_ether_addr(mgmt->da))
		return RX_DROP_U_NONBCAST_BEACON;

	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
		int sig = 0;

		/* sw bss color collision detection */
		ieee80211_rx_check_bss_color_collision(rx);

		if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
		    !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
			sig = status->signal;

		cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
						rx->skb->data, rx->skb->len,
						ieee80211_rx_status_to_khz(status),
						sig);
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

	return ieee80211_drop_unencrypted_mgmt(rx);
}

static bool
ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
{
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
	struct ieee80211_sub_if_data *sdata = rx->sdata;

	/* TWT actions are only supported in AP for the moment */
	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return false;

	if (!rx->local->ops->add_twt_setup)
		return false;

	if (!sdata->vif.bss_conf.twt_responder)
		return false;

	if (!rx->sta)
		return false;

	switch (mgmt->u.action.action_code) {
	case WLAN_S1G_TWT_SETUP: {
		struct ieee80211_twt_setup *twt;

		if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) +
				   sizeof(struct ieee80211_twt_setup) +
				   2 /* TWT req_type agrt */)
			break;

		twt = (void *)mgmt->u.action.s1g.variable;
		if (twt->element_id != WLAN_EID_S1G_TWT)
			break;

		if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) +
				   3 + /* token + tlv */
				   twt->length)
			break;

		return true; /* queue the frame */
	}
	case WLAN_S1G_TWT_TEARDOWN:
		if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 1)
			break;

		return true; /* queue the frame */
	default:
		break;
	}

	return false;
}

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;

	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_U_ACTION_UNKNOWN_SRC;

	switch (mgmt->u.action.category) {
	case WLAN_CATEGORY_HT:
		/* reject HT action frames from stations not supporting HT
		 * or not HE Capable
		 */
		if (!rx->link_sta->pub->ht_cap.ht_supported &&
		    !rx->link_sta->pub->he_cap.has_he)
			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(ht_smps))
			goto invalid;

		switch (mgmt->u.action.action_code) {
		case WLAN_HT_ACTION_SMPS: {
			struct ieee80211_supported_band *sband;
			enum ieee80211_smps_mode smps_mode;
			struct sta_opmode_info sta_opmode = {};

			if (sdata->vif.type != NL80211_IFTYPE_AP &&
			    sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
				goto handled;

			/* convert to HT capability */
			switch (mgmt->u.action.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->link_sta->pub->smps_mode == smps_mode)
				goto handled;
			rx->link_sta->pub->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->link_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: {
			u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth;

			if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ &&
			    chanwidth != IEEE80211_HT_CHANWIDTH_ANY)
				goto invalid;

			/* If it doesn't support 40 MHz it can't change ... */
			if (!(rx->link_sta->pub->ht_cap.cap &
				IEEE80211_HT_CAP_SUP_WIDTH_20_40))
				goto handled;

			goto queue;
		}
		default:
			goto invalid;
		}

		break;
	case WLAN_CATEGORY_PUBLIC:
	case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION:
		if (len < IEEE80211_MIN_ACTION_SIZE(action_code))
			goto invalid;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			break;
		if (!rx->sta)
			break;
		if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
			break;
		if (mgmt->u.action.action_code !=
				WLAN_PUB_ACTION_EXT_CHANSW_ANN)
			break;
		if (len < IEEE80211_MIN_ACTION_SIZE(ext_chan_switch))
			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(action_code))
			goto invalid;

		switch (mgmt->u.action.action_code) {
		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
			/* verify opmode is present */
			if (len < IEEE80211_MIN_ACTION_SIZE(vht_opmode_notif))
				goto invalid;
			goto queue;
		}
		case WLAN_VHT_ACTION_GROUPID_MGMT: {
			if (len < IEEE80211_MIN_ACTION_SIZE(vht_group_notif))
				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 &&
		    sdata->vif.type != NL80211_IFTYPE_NAN_DATA)
			break;

		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE(action_code))
			break;

		switch (mgmt->u.action.action_code) {
		case WLAN_ACTION_ADDBA_REQ:
		case WLAN_ACTION_NDP_ADDBA_REQ:
			if (len < IEEE80211_MIN_ACTION_SIZE(addba_req))
				goto invalid;
			break;
		case WLAN_ACTION_ADDBA_RESP:
		case WLAN_ACTION_NDP_ADDBA_RESP:
			if (len < IEEE80211_MIN_ACTION_SIZE(addba_resp))
				goto invalid;
			break;
		case WLAN_ACTION_DELBA:
		case WLAN_ACTION_NDP_DELBA:
			if (len < IEEE80211_MIN_ACTION_SIZE(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(action_code))
			break;

		switch (mgmt->u.action.action_code) {
		case WLAN_ACTION_SPCT_MSR_REQ:
			if (status->band != NL80211_BAND_5GHZ)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(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(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->deflink.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_SELF_PROTECTED:
		if (len < IEEE80211_MIN_ACTION_SIZE(self_prot))
			break;

		switch (mgmt->u.action.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(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;
	case WLAN_CATEGORY_S1G:
		if (len < IEEE80211_MIN_ACTION_SIZE(action_code))
			break;

		switch (mgmt->u.action.action_code) {
		case WLAN_S1G_TWT_SETUP:
		case WLAN_S1G_TWT_TEARDOWN:
			if (ieee80211_process_rx_twt_action(rx))
				goto queue;
			break;
		default:
			break;
		}
		break;
	case WLAN_CATEGORY_PROTECTED_EHT:
		if (len < IEEE80211_MIN_ACTION_SIZE(action_code))
			break;

		switch (mgmt->u.action.action_code) {
		case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_req))
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_res))
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_tear_down))
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			/* The reconfiguration response action frame must
			 * least one 'Status Duple' entry (3 octets)
			 */
			if (len < IEEE80211_MIN_ACTION_SIZE(ml_reconf_resp) + 3)
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(epcs) +
				  IEEE80211_EPCS_ENA_RESP_BODY_LEN)
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(epcs))
				goto invalid;
			goto queue;
		case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF:
			if (sdata->vif.type != NL80211_IFTYPE_AP)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(eml_omn))
				goto invalid;
			goto queue;
		default:
			break;
		}
		break;
	case WLAN_CATEGORY_PROTECTED_UHR:
		if (len < IEEE80211_MIN_ACTION_SIZE(action_code))
			break;

		switch (mgmt->u.action.action_code) {
		case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_AP)
				break;
			if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_req))
				goto invalid;
			if (mgmt->u.action.uhr_link_reconf_req.type !=
			    IEEE80211_UHR_LINK_RECONFIG_REQUEST_OMP_REQUEST)
				break;
			goto queue;
		case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_NOTIFY:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

			if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_notif))
				goto invalid;
			goto queue;
		}
		break;
	}

	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->link_sta->rx_stats.packets++;
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;

 queue:
	ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
	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);
	struct cfg80211_rx_info info = {
		.freq = ieee80211_rx_status_to_khz(status),
		.buf = rx->skb->data,
		.len = rx->skb->len,
		.link_id = rx->link_id,
		.have_link_id = rx->link_id >= 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))
		info.sig_dbm = status->signal;

	if (ieee80211_is_timing_measurement(rx->skb) ||
	    ieee80211_is_ftm(rx->skb)) {
		info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
		info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
	}

	if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
		if (rx->sta)
			rx->link_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_post_userspace(struct ieee80211_rx_data *rx)
{
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
	int len = rx->skb->len;

	if (!ieee80211_is_action(mgmt->frame_control))
		return RX_CONTINUE;

	switch (mgmt->u.action.category) {
	case WLAN_CATEGORY_SA_QUERY:
		if (len < IEEE80211_MIN_ACTION_SIZE(sa_query))
			break;

		switch (mgmt->u.action.action_code) {
		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;
	}

	return RX_CONTINUE;

 handled:
	if (rx->sta)
		rx->link_sta->rx_stats.packets++;
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
}

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 use the management frame registration
	 * mechanisms and old cooked monitor interface is no longer supported.
	 */
	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_U_MALFORMED_ACTION;

	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_U_UNKNOWN_MCAST_ACTION;

	/* do not return rejected action frames */
	if (mgmt->u.action.category & 0x80)
		return RX_DROP_U_REJECTED_ACTION_RESPONSE;

	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, -1,
					    status->band);
	}

	return RX_DROP_U_UNKNOWN_ACTION_REJECTED;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
{
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct ieee80211_hdr *hdr = (void *)rx->skb->data;

	if (!ieee80211_is_ext(hdr->frame_control))
		return RX_CONTINUE;

	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_U_UNEXPECTED_EXT_FRAME;

	/* for now only beacons are ext, so queue them */
	ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, 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_U_UNHANDLED_MGMT;

	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_U_MCAST_DEAUTH;

		/* process only for station/IBSS */
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			return RX_DROP_U_UNHANDLED_DEAUTH;
		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_U_MCAST_DISASSOC;

		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_U_UNHANDLED_DISASSOC;
		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_U_UNHANDLED_PREQ;
		break;
	default:
		return RX_DROP_U_UNHANDLED_MGMT_STYPE;
	}

	ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);

	return RX_QUEUED;
}

static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
					 ieee80211_rx_result res)
{
	if (res == RX_QUEUED) {
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
		return;
	}

	if (res != RX_CONTINUE) {
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->link_sta->rx_stats.dropped++;
	}

	kfree_skb_reason(rx->skb, (__force u32)res);
}

static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
				  struct sk_buff_head *frames)
{
	ieee80211_rx_result res;
	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;

		if (WARN_ON_ONCE(!rx->link)) {
			res = RX_DROP_U_NO_LINK;
			goto rxh_next;
		}

		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 */
		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_post_userspace);
		CALL_RXH(ieee80211_rx_h_action_return);
		CALL_RXH(ieee80211_rx_h_ext);
		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;

	__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
}

static bool
ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
{
	return !!(sta->valid_links & BIT(link_id));
}

static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
				       u8 link_id)
{
	rx->link_id = link_id;
	rx->link = rcu_dereference(rx->sdata->link[link_id]);

	if (!rx->sta)
		return rx->link;

	if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
		return false;

	rx->link_sta = rcu_dereference(rx->sta->link[link_id]);

	return rx->link && rx->link_sta;
}

static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
				      struct sta_info *sta, int link_id)
{
	rx->link_id = link_id;
	rx->sta = sta;

	if (sta) {
		rx->local = sta->sdata->local;
		if (!rx->sdata)
			rx->sdata = sta->sdata;
		rx->link_sta = &sta->deflink;
	} else {
		rx->link_sta = NULL;
	}

	if (link_id < 0) {
		if (ieee80211_vif_is_mld(&rx->sdata->vif) &&
		    sta && !sta->sta.valid_links)
			rx->link =
				rcu_dereference(rx->sdata->link[sta->deflink.link_id]);
		else
			rx->link = &rx->sdata->deflink;
	} else if (!ieee80211_rx_data_set_link(rx, link_id)) {
		return false;
	}

	return true;
}

/*
 * 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 = {
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
	};
	struct tid_ampdu_rx *tid_agg_rx;
	int link_id = -1;

	/* FIXME: statistics won't be right with this */
	if (sta->sta.valid_links)
		link_id = ffs(sta->sta.valid_links) - 1;

	if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
		return;

	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 ieee80211_local *local;
	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);

	local = sta->sdata->local;
	WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
		  "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
		  local->hw.max_rx_aggregation_subframes);

	if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
		return;

	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 inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
{
	return ether_addr_equal(raddr, addr) ||
	       is_broadcast_ether_addr(raddr);
}

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;
	static const u8 nan_network_id[ETH_ALEN] __aligned(2) = {
		0x51, 0x6F, 0x9A, 0x01, 0x00, 0x00
	};

	if (ieee80211_is_s1g_beacon(hdr->frame_control))
		return sdata->vif.type == NL80211_IFTYPE_STATION && bssid;

	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_first_frag(hdr->seq_ctrl) &&
		    ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
			return false;
		if (multicast)
			return true;
		return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
	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;
		/* reject invalid/our STA address */
		if (!is_valid_ether_addr(hdr->addr2) ||
		    ether_addr_equal(sdata->dev->dev_addr, hdr->addr2))
			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 ieee80211_is_our_addr(sdata, hdr->addr1,
						     &rx->link_id);

		if (!is_broadcast_ether_addr(bssid) &&
		    !ieee80211_is_our_addr(sdata, bssid, NULL)) {
			/*
			 * 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 &&
			    !ieee80211_is_our_addr(sdata, hdr->addr1,
						   &rx->link_id))
				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_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) ||
		       (ieee80211_is_auth(hdr->frame_control) &&
			ether_addr_equal(sdata->vif.addr, hdr->addr1));
	case NL80211_IFTYPE_NAN:
		if (ieee80211_has_tods(hdr->frame_control) ||
		    ieee80211_has_fromds(hdr->frame_control))
			return false;

		/*
		 * Accept only frames that are addressed to the NAN cluster
		 * (based on the Cluster ID). From these frames, accept only
		 *  - public action frames,
		 *  - authentication frames to the local address, and
		 *  - robust management frames except disassoc.
		 */
		if (!ether_addr_equal(sdata->u.nan.conf.cluster_id, hdr->addr3))
			return false;
		if (ieee80211_is_public_action(hdr, skb->len))
			return true;
		if (ieee80211_is_auth(hdr->frame_control) &&
		    ether_addr_equal(sdata->vif.addr, hdr->addr1))
			return true;
		if (!ieee80211_is_disassoc(hdr->frame_control) &&
		    ieee80211_is_robust_mgmt_frame(skb))
			return true;
		return false;
	case NL80211_IFTYPE_NAN_DATA:
		if (ieee80211_has_tods(hdr->frame_control) ||
		    ieee80211_has_fromds(hdr->frame_control))
			return false;

		if (ieee80211_is_data(hdr->frame_control)) {
			struct ieee80211_sub_if_data *nmi;

			nmi = rcu_dereference(sdata->u.nan_data.nmi);
			if (!nmi)
				return false;

			if (!ether_addr_equal(nmi->u.nan.conf.cluster_id,
					      hdr->addr3))
				return false;

			return multicast ||
			       ether_addr_equal(sdata->vif.addr, hdr->addr1);
		}

		/* Non-public action frames (unicast or multicast) */
		if (ieee80211_is_action(hdr->frame_control) &&
		    !ieee80211_is_public_action(hdr, skb->len) &&
		    (ether_addr_equal(nan_network_id, hdr->addr1) ||
		     ether_addr_equal(sdata->vif.addr, hdr->addr1)))
			return true;

		/* Unicast secure management frames */
		return ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
		       ieee80211_is_unicast_robust_mgmt_frame(skb);
	case NL80211_IFTYPE_PD:
		/*
		 * Accept only authentication frames (PASN) addressed to
		 * this interface.
		 */
		return ieee80211_is_auth(hdr->frame_control) &&
		       ether_addr_equal(sdata->vif.addr, hdr->addr1);
	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;
	u32 offload_flags;
	bool set_offload = false;
	bool assign = false;
	bool offload;

	/* 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.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;
	case NL80211_IFTYPE_MESH_POINT:
		fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
						      IEEE80211_FCTL_TODS);
		fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
		fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
		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.
			 */
			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);

	offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
	offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;

	if (assign && offload)
		set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
	else
		set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);

	if (set_offload)
		drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);

	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_wiphy(local->hw.wiphy);

	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;

	lockdep_assert_wiphy(local->hw.wiphy);

	__ieee80211_check_fast_rx_iface(sdata);
}

static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
			      struct ieee80211_fast_rx *fast_rx,
			      int orig_len)
{
	struct ieee80211_sta_rx_stats *stats;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
	struct sta_info *sta = rx->sta;
	struct link_sta_info *link_sta;
	struct sk_buff *skb = rx->skb;
	void *sa = skb->data + ETH_ALEN;
	void *da = skb->data;

	if (rx->link_id >= 0) {
		link_sta = rcu_dereference(sta->link[rx->link_id]);
		if (WARN_ON_ONCE(!link_sta)) {
			dev_kfree_skb(rx->skb);
			return;
		}
	} else {
		link_sta = &sta->deflink;
	}

	stats = &link_sta->rx_stats;
	if (fast_rx->uses_rss)
		stats = this_cpu_ptr(link_sta->pcpu_rx_stats);

	/* 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(&link_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(&link_sta->rx_stats_avg.chain_signal[i],
						-signal);
		}
	}
	/* end of statistics */

	stats->last_rx = jiffies;
	stats->last_rate = sta_stats_encode_rate(status);

	stats->fragments++;
	stats->packets++;

	skb->dev = fast_rx->dev;

	dev_sw_netstats_rx_add(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);
	u64_stats_inc(&stats->msdu[rx->seqno_idx]);
	u64_stats_add(&stats->bytes, orig_len);
	u64_stats_update_end(&stats->syncp);

	if (fast_rx->internal_forward) {
		struct sk_buff *xmit_skb = NULL;
		if (is_multicast_ether_addr(da)) {
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
		} else if (!ether_addr_equal(da, sa) &&
			   sta_info_get(rx->sdata, da)) {
			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;
	}

	/* deliver to local stack */
	skb->protocol = eth_type_trans(skb, fast_rx->dev);
	ieee80211_deliver_skb_to_local_stack(skb, rx);
}

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);
	ieee80211_rx_result res;
	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;
	u32 encoded_rate;

	/* 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 (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
	    !(status->rx_flags & IEEE80211_RX_AMSDU)) {
		if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
			return false;

		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 (fast_rx->uses_rss)
		stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
	else
		stats = &rx->link_sta->rx_stats;

	if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
	    pskb_trim(skb, skb->len - fast_rx->icv_len))
		goto drop;

	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;
	}

	/* 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);
	if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
	    skb_pull(skb, snap_offs - 2);
	    put_unaligned_be16(skb->len - 2, skb->data);
	} else {
	    skb_postpull_rcsum(skb, skb->data + snap_offs,
			       sizeof(rfc1042_header) + 2);

	    /* 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));

	/* capture before mesh forward may memset or free skb->cb */
	encoded_rate = sta_stats_encode_rate(status);

	res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
	switch (res) {
	case RX_QUEUED:
		stats->last_rx = jiffies;
		stats->last_rate = encoded_rate;
		return true;
	case RX_CONTINUE:
		break;
	default:
		goto drop;
	}

	ieee80211_rx_8023(rx, fast_rx, orig_len);

	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;
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct link_sta_info *link_sta = rx->link_sta;
	struct ieee80211_link_data *link = rx->link;

	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) {
		struct skb_shared_hwtstamps *shwt;

		rx->skb = skb_copy(skb, GFP_ATOMIC);
		if (!rx->skb) {
			if (net_ratelimit())
				wiphy_debug(local->hw.wiphy,
					"failed to copy skb for %s\n",
					sdata->name);
			return true;
		}

		/* skb_copy() does not copy the hw timestamps, so copy it
		 * explicitly
		 */
		shwt = skb_hwtstamps(rx->skb);
		shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;

		/* Update the hdr pointer to the new skb for translation below */
		hdr = (struct ieee80211_hdr *)rx->skb->data;
	}

	if (ieee80211_is_s1g_beacon(hdr->frame_control)) {
		ieee80211_invoke_rx_handlers(rx);
		return true;
	}

	/* Store a copy of the pre-translated link addresses for SW crypto */
	if (unlikely(is_unicast_ether_addr(hdr->addr1) &&
		     !ieee80211_is_data(hdr->frame_control)))
		memcpy(rx->link_addrs, &hdr->addrs, 3 * ETH_ALEN);

	if (unlikely(rx->sta && rx->sta->sta.mlo) &&
	    is_unicast_ether_addr(hdr->addr1) &&
	    !ieee80211_is_probe_resp(hdr->frame_control) &&
	    !ieee80211_is_beacon(hdr->frame_control)) {
		/* translate to MLD addresses */
		if (ether_addr_equal(link->conf->addr, hdr->addr1))
			ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
		if (ether_addr_equal(link_sta->addr, hdr->addr2))
			ether_addr_copy(hdr->addr2, rx->sta->addr);
		/* translate A3 only if it's the BSSID */
		if (!ieee80211_has_tods(hdr->frame_control) &&
		    !ieee80211_has_fromds(hdr->frame_control)) {
			if (ether_addr_equal(link_sta->addr, hdr->addr3))
				ether_addr_copy(hdr->addr3, rx->sta->addr);
			else if (ether_addr_equal(link->conf->addr, hdr->addr3))
				ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
		}
		/* not needed for A4 since it can only carry the SA */
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
				       struct ieee80211_sta *pubsta,
				       struct sk_buff *skb,
				       struct list_head *list)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_fast_rx *fast_rx;
	struct ieee80211_rx_data rx;
	struct sta_info *sta;
	int link_id = -1;

	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
	rx.list = list;
	rx.link_id = -1;

	I802_DEBUG_INC(local->dot11ReceivedFragmentCount);

	/* drop frame if too short for header */
	if (skb->len < sizeof(struct ethhdr))
		goto drop;

	if (!pubsta)
		goto drop;

	if (status->link_valid)
		link_id = status->link_id;

	/*
	 * TODO: Should the frame be dropped if the right link_id is not
	 * available? Or may be it is fine in the current form to proceed with
	 * the frame processing because with frame being in 802.3 format,
	 * link_id is used only for stats purpose and updating the stats on
	 * the deflink is fine?
	 */
	sta = container_of(pubsta, struct sta_info, sta);
	if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
		goto drop;

	fast_rx = rcu_dereference(rx.sta->fast_rx);
	if (!fast_rx)
		goto drop;

	ieee80211_rx_8023(&rx, fast_rx, skb->len);
	return;

drop:
	dev_kfree_skb(skb);
}

static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
				       struct sk_buff *skb, bool consume)
{
	struct link_sta_info *link_sta;
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct sta_info *sta;
	int link_id = -1;

	if (ieee80211_is_s1g_beacon(hdr->frame_control)) {
		if (!ieee80211_rx_data_set_sta(rx, NULL, -1))
			return false;

		return ieee80211_prepare_and_rx_handle(rx, skb, consume);
	}

	/*
	 * Look up link station first, in case there's a
	 * chance that they might have a link address that
	 * is identical to the MLD address, that way we'll
	 * have the link information if needed.
	 */
	link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
	if (link_sta) {
		sta = link_sta->sta;
		link_id = link_sta->link_id;
	} else {
		struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

		sta = sta_info_get_bss(rx->sdata, hdr->addr2);
		if (status->link_valid) {
			link_id = status->link_id;
		} else if (ieee80211_vif_is_mld(&rx->sdata->vif) &&
			   status->freq) {
			struct ieee80211_link_data *link;
			struct ieee80211_chanctx_conf *conf;

			for_each_link_data_rcu(rx->sdata, link) {
				conf = rcu_dereference(link->conf->chanctx_conf);
				if (!conf || !conf->def.chan)
					continue;

				if (status->freq == conf->def.chan->center_freq) {
					link_id = link->link_id;
					break;
				}
			}
		}
	}

	if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
		return false;

	return ieee80211_prepare_and_rx_handle(rx, skb, consume);
}

/*
 * 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 list_head *list)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	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.list = list;
	rx.link_id = -1;

	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 if (ieee80211_is_s1g_beacon(fc)) {
		size_t s1g_hdr_len = offsetof(struct ieee80211_ext,
					      u.s1g_beacon.variable) +
				     ieee80211_s1g_optional_len(fc);

		if (skb->len < s1g_hdr_len)
			err = -ENOBUFS;
		else
			err = skb_linearize(skb);
	} else if (ieee80211_is_ext(fc)) {
		err = -EINVAL;
	} 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_is_s1g_beacon(hdr->frame_control)))
		ieee80211_scan_rx(local, skb);

	if (ieee80211_is_data(fc)) {
		struct sta_info *sta, *prev_sta;
		int link_id = -1;

		if (status->link_valid)
			link_id = status->link_id;

		if (pubsta) {
			sta = container_of(pubsta, struct sta_info, sta);
			if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
				goto out;

			/*
			 * In MLO connection, fetch the link_id using addr2
			 * when the driver does not pass link_id in status.
			 * When the address translation is already performed by
			 * driver/hw, the valid link_id must be passed in
			 * status.
			 */

			if (!status->link_valid && pubsta->mlo) {
				struct link_sta_info *link_sta;

				link_sta = link_sta_info_get_bss(rx.sdata,
								 hdr->addr2);
				if (!link_sta)
					goto out;

				if (!ieee80211_rx_data_set_link(&rx,
								link_sta->link_id))
					goto out;
			}

			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.sdata = prev_sta->sdata;
			if (!status->link_valid && prev_sta->sta.mlo) {
				struct link_sta_info *link_sta;

				link_sta = link_sta_info_get_bss(rx.sdata,
								 hdr->addr2);
				if (!link_sta)
					continue;

				link_id = link_sta->link_id;
			}

			if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
				goto out;

			ieee80211_prepare_and_rx_handle(&rx, skb, false);

			prev_sta = sta;
		}

		if (prev_sta) {
			rx.sdata = prev_sta->sdata;
			if (!status->link_valid && prev_sta->sta.mlo) {
				struct link_sta_info *link_sta;

				link_sta = link_sta_info_get_bss(rx.sdata,
								 hdr->addr2);
				if (!link_sta)
					goto out;

				link_id = link_sta->link_id;
			}

			if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
				goto out;

			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.sdata = prev;
		ieee80211_rx_for_interface(&rx, skb, false);

		prev = sdata;
	}

	if (prev) {
		rx.sdata = prev;

		if (ieee80211_rx_for_interface(&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_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
		       struct sk_buff *skb, struct list_head *list)
{
	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);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	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) &&
		   !(status->flag & RX_FLAG_NO_PSDU &&
		     status->zero_length_psdu_type ==
		     IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED))) {
		/*
		 * Validate the rate, unless there was a PLCP error which may
		 * have an invalid rate or the PSDU was not capture and may be
		 * missing rate information.
		 */

		switch (status->encoding) {
		case RX_ENC_HT:
			/*
			 * rate_idx is MCS index, which can be [0-76]
			 * as documented on:
			 *
			 * https://wireless.wiki.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;
		case RX_ENC_EHT:
			if (WARN_ONCE(status->rate_idx > 15 ||
				      !status->nss ||
				      status->nss > 8 ||
				      status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
				      "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
				      status->rate_idx, status->nss, status->eht.gi))
				goto drop;
			break;
		case RX_ENC_UHR:
			if (WARN_ONCE(!(status->rate_idx <= 15 ||
					status->rate_idx == 17 ||
					status->rate_idx == 19 ||
					status->rate_idx == 20 ||
					status->rate_idx == 23) ||
				      !status->nss ||
				      status->nss > 8 ||
				      status->uhr.gi > NL80211_RATE_INFO_EHT_GI_3_2,
				      "Rate marked as a UHR rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
				      status->rate_idx, status->nss, status->uhr.gi))
				goto drop;
			if (WARN_ONCE(status->uhr.elr &&
				      (status->nss != 1 || status->rate_idx > 1 ||
				       status->uhr.gi != NL80211_RATE_INFO_EHT_GI_1_6 ||
				       status->bw != RATE_INFO_BW_20 || status->uhr.im),
				      "bad UHR ELR MCS MCS:%d, NSS:%d, GI:%d, BW:%d, IM:%d\n",
				      status->rate_idx, status->nss, status->uhr.gi,
				      status->bw, status->uhr.im))
				goto drop;
			if (WARN_ONCE(status->uhr.im &&
				      (status->nss != 1 || status->rate_idx == 15),
				      "bad UHR IM MCS MCS:%d, NSS:%d\n",
				      status->rate_idx, status->nss))
				goto drop;
			break;
		case RX_ENC_S1G:
			if (WARN_ONCE(status->rate_idx > 12 ||
				      !status->nss ||
				      status->nss > 4,
				      "Rate marked as an S1G rate but data is invalid: MCS: %d, NSS: %d\n",
				      status->rate_idx, status->nss))
				goto drop;
			break;
		default:
			WARN_ON_ONCE(1);
			fallthrough;
		case RX_ENC_LEGACY:
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
	}

	if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
		goto drop;

	status->rx_flags = 0;

	kcov_remote_start_common(skb_get_kcov_handle(skb));

	/*
	 * 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.
	 */
	if (!(status->flag & RX_FLAG_8023))
		skb = ieee80211_rx_monitor(local, skb, rate);
	if (skb) {
		if ((status->flag & RX_FLAG_8023) ||
			ieee80211_is_data_present(hdr->frame_control))
			ieee80211_tpt_led_trig_rx(local, skb->len);

		if (status->flag & RX_FLAG_8023)
			__ieee80211_rx_handle_8023(hw, pubsta, skb, list);
		else
			__ieee80211_rx_handle_packet(hw, pubsta, skb, list);
	}

	kcov_remote_stop();
	return;
 drop:
	kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_rx_list);

void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
		       struct sk_buff *skb, struct napi_struct *napi)
{
	struct sk_buff *tmp;
	LIST_HEAD(list);


	/*
	 * 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();
	ieee80211_rx_list(hw, pubsta, skb, &list);
	rcu_read_unlock();

	if (!napi) {
		netif_receive_skb_list(&list);
		return;
	}

	list_for_each_entry_safe(skb, tmp, &list, list) {
		skb_list_del_init(skb);
		napi_gro_receive(napi, 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);