rx.c 90.0 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
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 * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
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#include "rate.h"
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/*
 * monitor mode reception
 *
 * This function cleans up the SKB, i.e. it removes all the stuff
 * only useful for monitoring.
 */
static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
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					   struct sk_buff *skb)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

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	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
		if (likely(skb->len > FCS_LEN))
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			__pskb_trim(skb, skb->len - FCS_LEN);
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		else {
			/* driver bug */
			WARN_ON(1);
			dev_kfree_skb(skb);
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			return NULL;
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		}
	}

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	if (status->vendor_radiotap_len)
		__pskb_pull(skb, status->vendor_radiotap_len);

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	return skb;
}

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static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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	struct ieee80211_hdr *hdr;

	hdr = (void *)(skb->data + status->vendor_radiotap_len);
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	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
			    RX_FLAG_FAILED_PLCP_CRC |
			    RX_FLAG_AMPDU_IS_ZEROLEN))
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		return 1;
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	if (unlikely(skb->len < 16 + present_fcs_len +
				status->vendor_radiotap_len))
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		return 1;
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	if (ieee80211_is_ctl(hdr->frame_control) &&
	    !ieee80211_is_pspoll(hdr->frame_control) &&
	    !ieee80211_is_back_req(hdr->frame_control))
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		return 1;
	return 0;
}

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static int
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ieee80211_rx_radiotap_space(struct ieee80211_local *local,
			    struct ieee80211_rx_status *status)
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{
	int len;

	/* always present fields */
	len = sizeof(struct ieee80211_radiotap_header) + 9;

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	/* allocate extra bitmap */
	if (status->vendor_radiotap_len)
		len += 4;

	if (ieee80211_have_rx_timestamp(status)) {
		len = ALIGN(len, 8);
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		len += 8;
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	}
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	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
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		len += 1;

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	/* padding for RX_FLAGS if necessary */
	len = ALIGN(len, 2);
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	if (status->flag & RX_FLAG_HT) /* HT info */
		len += 3;

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	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
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		len = ALIGN(len, 4);
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		len += 8;
	}

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	if (status->flag & RX_FLAG_VHT) {
		len = ALIGN(len, 2);
		len += 12;
	}

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	if (status->vendor_radiotap_len) {
		if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
			status->vendor_radiotap_align = 1;
		/* align standard part of vendor namespace */
		len = ALIGN(len, 2);
		/* allocate standard part of vendor namespace */
		len += 6;
		/* align vendor-defined part */
		len = ALIGN(len, status->vendor_radiotap_align);
		/* vendor-defined part is already in skb */
	}

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	return len;
}

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/*
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 * 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,
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				 int rtap_len, bool has_fcs)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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	struct ieee80211_radiotap_header *rthdr;
	unsigned char *pos;
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	u16 rx_flags = 0;
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	int mpdulen;

	mpdulen = skb->len;
	if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
		mpdulen += FCS_LEN;
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	rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
	memset(rthdr, 0, rtap_len);

	/* radiotap header, set always present flags */
	rthdr->it_present =
		cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
			    (1 << IEEE80211_RADIOTAP_CHANNEL) |
			    (1 << IEEE80211_RADIOTAP_ANTENNA) |
			    (1 << IEEE80211_RADIOTAP_RX_FLAGS));
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	rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
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	pos = (unsigned char *)(rthdr + 1);
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	if (status->vendor_radiotap_len) {
		rthdr->it_present |=
			cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
			cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
		put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
		pos += 4;
	}

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	/* the order of the following fields is important */

	/* IEEE80211_RADIOTAP_TSFT */
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	if (ieee80211_have_rx_timestamp(status)) {
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		/* padding */
		while ((pos - (u8 *)rthdr) & 7)
			*pos++ = 0;
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		put_unaligned_le64(
			ieee80211_calculate_rx_timestamp(local, status,
							 mpdulen, 0),
			pos);
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		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
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		pos += 8;
	}

	/* IEEE80211_RADIOTAP_FLAGS */
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	if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
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		*pos |= IEEE80211_RADIOTAP_F_FCS;
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	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		*pos |= IEEE80211_RADIOTAP_F_BADFCS;
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	if (status->flag & RX_FLAG_SHORTPRE)
		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
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	pos++;

	/* IEEE80211_RADIOTAP_RATE */
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	if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
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		/*
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		 * Without rate information don't add it. If we have,
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		 * MCS information is a separate field in radiotap,
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		 * added below. The byte here is needed as padding
		 * for the channel though, so initialise it to 0.
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		 */
		*pos = 0;
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	} else {
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		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
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		*pos = rate->bitrate / 5;
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	}
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	pos++;

	/* IEEE80211_RADIOTAP_CHANNEL */
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	put_unaligned_le16(status->freq, pos);
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	pos += 2;
	if (status->band == IEEE80211_BAND_5GHZ)
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		put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
				   pos);
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	else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
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		put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
				   pos);
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	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
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		put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
				   pos);
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	else if (rate)
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		put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
				   pos);
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	else
		put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
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	pos += 2;

	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
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	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
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		*pos = status->signal;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
		pos++;
	}

	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */

	/* 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 */
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	if ((pos - (u8 *)rthdr) & 1)
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		*pos++ = 0;
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	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
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		rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
	put_unaligned_le16(rx_flags, pos);
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	pos += 2;
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	if (status->flag & RX_FLAG_HT) {
		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
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		*pos++ = local->hw.radiotap_mcs_details;
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		*pos = 0;
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_MCS_SGI;
		if (status->flag & RX_FLAG_40MHZ)
			*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
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		if (status->flag & RX_FLAG_HT_GF)
			*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
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		pos++;
		*pos++ = status->rate_idx;
	}
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	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
		u16 flags = 0;

		/* ensure 4 byte alignment */
		while ((pos - (u8 *)rthdr) & 3)
			pos++;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
		put_unaligned_le32(status->ampdu_reference, pos);
		pos += 4;
		if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
			flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
		if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
			flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
		if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
		if (status->flag & RX_FLAG_AMPDU_IS_LAST)
			flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
		put_unaligned_le16(flags, pos);
		pos += 2;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			*pos++ = status->ampdu_delimiter_crc;
		else
			*pos++ = 0;
		*pos++ = 0;
	}
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	if (status->flag & RX_FLAG_VHT) {
		u16 known = local->hw.radiotap_vht_details;

		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
		/* known field - how to handle 80+80? */
		if (status->flag & RX_FLAG_80P80MHZ)
			known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
		put_unaligned_le16(known, pos);
		pos += 2;
		/* flags */
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
		pos++;
		/* bandwidth */
		if (status->flag & RX_FLAG_80MHZ)
			*pos++ = 4;
		else if (status->flag & RX_FLAG_80P80MHZ)
			*pos++ = 0; /* marked not known above */
		else if (status->flag & RX_FLAG_160MHZ)
			*pos++ = 11;
		else if (status->flag & RX_FLAG_40MHZ)
			*pos++ = 1;
		else /* 20 MHz */
			*pos++ = 0;
		/* MCS/NSS */
		*pos = (status->rate_idx << 4) | status->vht_nss;
		pos += 4;
		/* coding field */
		pos++;
		/* group ID */
		pos++;
		/* partial_aid */
		pos += 2;
	}

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	if (status->vendor_radiotap_len) {
		/* ensure 2 byte alignment for the vendor field as required */
		if ((pos - (u8 *)rthdr) & 1)
			*pos++ = 0;
		*pos++ = status->vendor_radiotap_oui[0];
		*pos++ = status->vendor_radiotap_oui[1];
		*pos++ = status->vendor_radiotap_oui[2];
		*pos++ = status->vendor_radiotap_subns;
		put_unaligned_le16(status->vendor_radiotap_len, pos);
		pos += 2;
		/* align the actual payload as requested */
		while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
			*pos++ = 0;
	}
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}

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/*
 * 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,
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		     struct ieee80211_rate *rate)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
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	struct ieee80211_sub_if_data *sdata;
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	int needed_headroom;
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	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;

	/*
	 * 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.
	 */
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	/* room for the radiotap header based on driver features */
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	needed_headroom = ieee80211_rx_radiotap_space(local, status);
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	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
		present_fcs_len = FCS_LEN;

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	/* ensure hdr->frame_control and vendor radiotap data are in skb head */
	if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
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		dev_kfree_skb(origskb);
		return NULL;
	}

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	if (!local->monitors) {
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		if (should_drop_frame(origskb, present_fcs_len)) {
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			dev_kfree_skb(origskb);
			return NULL;
		}

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		return remove_monitor_info(local, origskb);
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	}

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	if (should_drop_frame(origskb, present_fcs_len)) {
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		/* 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 &&
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		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
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			dev_kfree_skb(skb);
			return NULL;
		}
	} else {
		/*
		 * Need to make a copy and possibly remove radiotap header
		 * and FCS from the original.
		 */
		skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);

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		origskb = remove_monitor_info(local, origskb);
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		if (!skb)
			return origskb;
	}

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	/* prepend radiotap information */
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	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 true);
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	skb_reset_mac_header(skb);
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	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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			continue;

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		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
			continue;

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		if (!ieee80211_sdata_running(sdata))
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			continue;

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		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
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				netif_receive_skb(skb2);
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			}
		}

		prev_dev = sdata->dev;
		sdata->dev->stats.rx_packets++;
		sdata->dev->stats.rx_bytes += skb->len;
	}

	if (prev_dev) {
		skb->dev = prev_dev;
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		netif_receive_skb(skb);
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	} else
		dev_kfree_skb(skb);

	return origskb;
}

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static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
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	int tid, seqno_idx, security_idx;
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	/* does the frame have a qos control field? */
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	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
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		/* frame has qos control */
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		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
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		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
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			status->rx_flags |= IEEE80211_RX_AMSDU;
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		seqno_idx = tid;
		security_idx = tid;
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	} else {
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		/*
		 * 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.
		 */
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		seqno_idx = IEEE80211_NUM_TIDS;
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		security_idx = 0;
		if (ieee80211_is_mgmt(hdr->frame_control))
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			security_idx = IEEE80211_NUM_TIDS;
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		tid = 0;
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	}
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	rx->seqno_idx = seqno_idx;
	rx->security_idx = security_idx;
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	/* 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;
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}
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/**
 * DOC: Packet alignment
 *
 * Drivers always need to pass packets that are aligned to two-byte boundaries
 * to the stack.
 *
 * Additionally, should, if possible, align the payload data in a way that
 * guarantees that the contained IP header is aligned to a four-byte
 * boundary. In the case of regular frames, this simply means aligning the
 * payload to a four-byte boundary (because either the IP header is directly
 * contained, or IV/RFC1042 headers that have a length divisible by four are
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 * 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.
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 *
 * 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.
 *
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 * Padding like Atheros hardware adds which is between the 802.11 header and
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 * 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)
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{
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	WARN_ONCE((unsigned long)rx->skb->data & 1,
		  "unaligned packet at 0x%p\n", rx->skb->data);
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#endif
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}

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/* rx handlers */

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static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
		return 0;

	return ieee80211_is_robust_mgmt_frame(hdr);
}


static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
		return 0;

	return ieee80211_is_robust_mgmt_frame(hdr);
}


/* 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;

J
Johannes Berg 已提交
579
	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
580 581 582 583 584 585 586 587 588 589 590 591 592 593
		return -1;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
		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 -1;

	return le16_to_cpu(mmie->key_id);
}

J
Johannes Berg 已提交
594
static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
595
{
596
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597
	char *dev_addr = rx->sdata->vif.addr;
598

599
	if (ieee80211_is_data(hdr->frame_control)) {
600 601
		if (is_multicast_ether_addr(hdr->addr1)) {
			if (ieee80211_has_tods(hdr->frame_control) ||
J
Johannes Berg 已提交
602
			    !ieee80211_has_fromds(hdr->frame_control))
603
				return RX_DROP_MONITOR;
604
			if (ether_addr_equal(hdr->addr3, dev_addr))
605 606 607 608
				return RX_DROP_MONITOR;
		} else {
			if (!ieee80211_has_a4(hdr->frame_control))
				return RX_DROP_MONITOR;
609
			if (ether_addr_equal(hdr->addr4, dev_addr))
610 611
				return RX_DROP_MONITOR;
		}
612 613 614 615 616 617
	}

	/* If there is not an established peer link and this is not a peer link
	 * establisment frame, beacon or probe, drop the frame.
	 */

618
	if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
619
		struct ieee80211_mgmt *mgmt;
620

621
		if (!ieee80211_is_mgmt(hdr->frame_control))
622 623
			return RX_DROP_MONITOR;

624
		if (ieee80211_is_action(hdr->frame_control)) {
625
			u8 category;
626 627 628 629 630

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

631
			mgmt = (struct ieee80211_mgmt *)hdr;
632 633
			category = mgmt->u.action.category;
			if (category != WLAN_CATEGORY_MESH_ACTION &&
J
Johannes Berg 已提交
634
			    category != WLAN_CATEGORY_SELF_PROTECTED)
635 636 637 638
				return RX_DROP_MONITOR;
			return RX_CONTINUE;
		}

639 640
		if (ieee80211_is_probe_req(hdr->frame_control) ||
		    ieee80211_is_probe_resp(hdr->frame_control) ||
641 642
		    ieee80211_is_beacon(hdr->frame_control) ||
		    ieee80211_is_auth(hdr->frame_control))
643 644 645 646 647
			return RX_CONTINUE;

		return RX_DROP_MONITOR;
	}

J
Johannes Berg 已提交
648 649
	return RX_CONTINUE;
}
650

651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
#define SEQ_MODULO 0x1000
#define SEQ_MASK   0xfff

static inline int seq_less(u16 sq1, u16 sq2)
{
	return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
}

static inline u16 seq_inc(u16 sq)
{
	return (sq + 1) & SEQ_MASK;
}

static inline u16 seq_sub(u16 sq1, u16 sq2)
{
	return (sq1 - sq2) & SEQ_MASK;
}

669
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
670
					    struct tid_ampdu_rx *tid_agg_rx,
671
					    int index)
672
{
673
	struct ieee80211_local *local = sdata->local;
674
	struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
675
	struct ieee80211_rx_status *status;
676

677 678
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

679 680 681
	if (!skb)
		goto no_frame;

682
	/* release the frame from the reorder ring buffer */
683 684
	tid_agg_rx->stored_mpdu_num--;
	tid_agg_rx->reorder_buf[index] = NULL;
685 686
	status = IEEE80211_SKB_RXCB(skb);
	status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
687
	skb_queue_tail(&local->rx_skb_queue, skb);
688 689 690 691 692

no_frame:
	tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
}

693
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
694
					     struct tid_ampdu_rx *tid_agg_rx,
695
					     u16 head_seq_num)
696 697 698
{
	int index;

699 700
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

701 702 703
	while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
		index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
							tid_agg_rx->buf_size;
704
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
705 706 707 708 709 710 711 712 713
	}
}

/*
 * 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.
714 715
 *
 * Callers must hold tid_agg_rx->reorder_lock.
716 717 718
 */
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)

719
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
720
					  struct tid_ampdu_rx *tid_agg_rx)
721
{
722
	int index, j;
723

724 725
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

726 727 728 729
	/* release the buffer until next missing frame */
	index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
						tid_agg_rx->buf_size;
	if (!tid_agg_rx->reorder_buf[index] &&
730
	    tid_agg_rx->stored_mpdu_num) {
731 732 733 734 735 736 737 738 739 740 741
		/*
		 * 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 (!tid_agg_rx->reorder_buf[j]) {
				skipped++;
				continue;
			}
742 743
			if (skipped &&
			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
744
					HT_RX_REORDER_BUF_TIMEOUT))
745
				goto set_release_timer;
746

J
Johannes Berg 已提交
747 748
			ht_dbg_ratelimited(sdata,
					   "release an RX reorder frame due to timeout on earlier frames\n");
749
			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
750 751 752 753 754 755 756 757 758

			/*
			 * Increment the head seq# also for the skipped slots.
			 */
			tid_agg_rx->head_seq_num =
				(tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
			skipped = 0;
		}
	} else while (tid_agg_rx->reorder_buf[index]) {
759
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
760 761 762
		index =	seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
							tid_agg_rx->buf_size;
	}
763 764 765 766 767 768 769 770 771 772 773 774 775 776

	if (tid_agg_rx->stored_mpdu_num) {
		j = index = seq_sub(tid_agg_rx->head_seq_num,
				    tid_agg_rx->ssn) % tid_agg_rx->buf_size;

		for (; j != (index - 1) % tid_agg_rx->buf_size;
		     j = (j + 1) % tid_agg_rx->buf_size) {
			if (tid_agg_rx->reorder_buf[j])
				break;
		}

 set_release_timer:

		mod_timer(&tid_agg_rx->reorder_timer,
777
			  tid_agg_rx->reorder_time[j] + 1 +
778 779 780 781
			  HT_RX_REORDER_BUF_TIMEOUT);
	} else {
		del_timer(&tid_agg_rx->reorder_timer);
	}
782 783
}

784 785 786 787 788
/*
 * 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.
 */
789
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
790
					     struct tid_ampdu_rx *tid_agg_rx,
791
					     struct sk_buff *skb)
792 793 794 795 796 797
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	u16 sc = le16_to_cpu(hdr->seq_ctrl);
	u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
	u16 head_seq_num, buf_size;
	int index;
798
	bool ret = true;
799

800 801
	spin_lock(&tid_agg_rx->reorder_lock);

802 803 804 805 806 807
	buf_size = tid_agg_rx->buf_size;
	head_seq_num = tid_agg_rx->head_seq_num;

	/* frame with out of date sequence number */
	if (seq_less(mpdu_seq_num, head_seq_num)) {
		dev_kfree_skb(skb);
808
		goto out;
809 810 811 812 813 814 815 816 817
	}

	/*
	 * If frame the sequence number exceeds our buffering window
	 * size release some previous frames to make room for this one.
	 */
	if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
		head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
		/* release stored frames up to new head to stack */
818 819
		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
						 head_seq_num);
820 821 822 823 824 825 826 827 828
	}

	/* Now the new frame is always in the range of the reordering buffer */

	index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;

	/* check if we already stored this frame */
	if (tid_agg_rx->reorder_buf[index]) {
		dev_kfree_skb(skb);
829
		goto out;
830 831 832 833 834
	}

	/*
	 * If the current MPDU is in the right order and nothing else
	 * is stored we can process it directly, no need to buffer it.
835 836
	 * If it is first but there's something stored, we may be able
	 * to release frames after this one.
837 838 839 840
	 */
	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
	    tid_agg_rx->stored_mpdu_num == 0) {
		tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
841 842
		ret = false;
		goto out;
843 844 845 846 847 848
	}

	/* put the frame in the reordering buffer */
	tid_agg_rx->reorder_buf[index] = skb;
	tid_agg_rx->reorder_time[index] = jiffies;
	tid_agg_rx->stored_mpdu_num++;
849
	ieee80211_sta_reorder_release(sdata, tid_agg_rx);
850

851 852 853
 out:
	spin_unlock(&tid_agg_rx->reorder_lock);
	return ret;
854 855 856 857 858 859
}

/*
 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 * true if the MPDU was buffered, false if it should be processed.
 */
860
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
861
{
862 863
	struct sk_buff *skb = rx->skb;
	struct ieee80211_local *local = rx->local;
864
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
865
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866
	struct sta_info *sta = rx->sta;
867 868
	struct tid_ampdu_rx *tid_agg_rx;
	u16 sc;
869
	u8 tid, ack_policy;
870 871

	if (!ieee80211_is_data_qos(hdr->frame_control))
872
		goto dont_reorder;
873 874 875 876 877 878 879

	/*
	 * filter the QoS data rx stream according to
	 * STA/TID and check if this STA/TID is on aggregation
	 */

	if (!sta)
880
		goto dont_reorder;
881

882 883
	ack_policy = *ieee80211_get_qos_ctl(hdr) &
		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
884 885
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;

886 887 888
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		goto dont_reorder;
889 890 891

	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
892
		goto dont_reorder;
893

894 895 896 897 898
	/* not part of a BA session */
	if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
	    ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
		goto dont_reorder;

899 900 901 902
	/* not actually part of this BA session */
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
		goto dont_reorder;

903 904 905 906
	/* new, potentially un-ordered, ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout)
907
		tid_agg_rx->last_rx = jiffies;
908 909 910 911

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
912
		skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
913 914
		skb_queue_tail(&rx->sdata->skb_queue, skb);
		ieee80211_queue_work(&local->hw, &rx->sdata->work);
915
		return;
916 917
	}

918 919 920 921 922 923 924
	/*
	 * 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.
	 */
925
	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
926 927 928
		return;

 dont_reorder:
929
	skb_queue_tail(&local->rx_skb_queue, skb);
930
}
931

932
static ieee80211_rx_result debug_noinline
933
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
934
{
935
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
936
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
937 938 939

	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
	if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
940
		if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
941
			     rx->sta->last_seq_ctrl[rx->seqno_idx] ==
942
			     hdr->seq_ctrl)) {
943
			if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
944 945 946
				rx->local->dot11FrameDuplicateCount++;
				rx->sta->num_duplicates++;
			}
947
			return RX_DROP_UNUSABLE;
948
		} else
949
			rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
950 951 952 953
	}

	if (unlikely(rx->skb->len < 16)) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
J
Johannes Berg 已提交
954
		return RX_DROP_MONITOR;
955 956 957 958 959
	}

	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
J
Johannes Berg 已提交
960 961
	 * mac80211 filters only based on association state, i.e. it drops
	 * Class 3 frames from not associated stations. hostapd sends
962 963 964
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
965

J
Johannes Berg 已提交
966
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
967 968
		return ieee80211_rx_mesh_check(rx);

969 970
	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
971
		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
B
Bill Jordan 已提交
972
		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
J
Johannes Berg 已提交
973
		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
974 975 976 977 978 979
		/*
		 * 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 &&
980
		    ieee80211_is_data_present(hdr->frame_control)) {
981 982 983 984 985 986 987 988 989 990
			unsigned int hdrlen;
			__be16 ethertype;

			hdrlen = ieee80211_hdrlen(hdr->frame_control);

			if (rx->skb->len < hdrlen + 8)
				return RX_DROP_MONITOR;

			skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
			if (ethertype == rx->sdata->control_port_protocol)
991 992
				return RX_CONTINUE;
		}
993 994 995 996 997 998 999

		if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
		    cfg80211_rx_spurious_frame(rx->sdata->dev,
					       hdr->addr2,
					       GFP_ATOMIC))
			return RX_DROP_UNUSABLE;

J
Johannes Berg 已提交
1000
		return RX_DROP_MONITOR;
1001
	}
1002

1003
	return RX_CONTINUE;
1004 1005 1006
}


1007
static ieee80211_rx_result debug_noinline
1008
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1009
{
J
Johannes Berg 已提交
1010 1011 1012
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1013 1014
	int keyidx;
	int hdrlen;
J
Johannes Berg 已提交
1015
	ieee80211_rx_result result = RX_DROP_UNUSABLE;
1016
	struct ieee80211_key *sta_ptk = NULL;
1017
	int mmie_keyidx = -1;
J
Johannes Berg 已提交
1018
	__le16 fc;
1019

1020 1021 1022
	/*
	 * Key selection 101
	 *
1023
	 * There are four types of keys:
1024
	 *  - GTK (group keys)
1025
	 *  - IGTK (group keys for management frames)
1026 1027 1028 1029 1030
	 *  - 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
1031 1032 1033 1034
	 * use PTKs and STKs while the former always use GTKs and IGTKs.
	 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
	 * unicast frames can also use key indices like GTKs. Hence, if we
	 * don't have a PTK/STK we check the key index for a WEP key.
1035
	 *
1036 1037 1038 1039
	 * 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.
	 *
1040 1041
	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
1042 1043 1044
	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
1045 1046 1047
	 */

	/*
1048
	 * No point in finding a key and decrypting if the frame is neither
1049 1050
	 * addressed to us nor a multicast frame.
	 */
1051
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1052
		return RX_CONTINUE;
1053

1054 1055 1056
	/* start without a key */
	rx->key = NULL;

1057
	if (rx->sta)
1058
		sta_ptk = rcu_dereference(rx->sta->ptk);
1059

J
Johannes Berg 已提交
1060 1061 1062
	fc = hdr->frame_control;

	if (!ieee80211_has_protected(fc))
1063 1064
		mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);

1065 1066
	if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
		rx->key = sta_ptk;
1067 1068 1069
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;
1070
		/* Skip decryption if the frame is not protected. */
J
Johannes Berg 已提交
1071
		if (!ieee80211_has_protected(fc))
1072
			return RX_CONTINUE;
1073 1074
	} else if (mmie_keyidx >= 0) {
		/* Broadcast/multicast robust management frame / BIP */
J
Johannes Berg 已提交
1075 1076
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
1077 1078 1079 1080 1081
			return RX_CONTINUE;

		if (mmie_keyidx < NUM_DEFAULT_KEYS ||
		    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
			return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1082 1083 1084 1085
		if (rx->sta)
			rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
		if (!rx->key)
			rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
J
Johannes Berg 已提交
1086
	} else if (!ieee80211_has_protected(fc)) {
1087 1088 1089 1090 1091 1092 1093
		/*
		 * 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;
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1094 1095 1096
		struct ieee80211_sub_if_data *sdata = rx->sdata;
		int i;

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1097
		if (ieee80211_is_mgmt(fc) &&
1098 1099 1100
		    is_multicast_ether_addr(hdr->addr1) &&
		    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
			rx->key = key;
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1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
		else {
			if (rx->sta) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(rx->sta->gtk[i]);
					if (key)
						break;
				}
			}
			if (!key) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(sdata->keys[i]);
					if (key)
						break;
				}
			}
			if (key)
				rx->key = key;
		}
1119
		return RX_CONTINUE;
1120
	} else {
1121
		u8 keyid;
1122 1123 1124 1125 1126 1127 1128 1129 1130
		/*
		 * 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?
		 */
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1131 1132
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
1133
			return RX_CONTINUE;
1134

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1135
		hdrlen = ieee80211_hdrlen(fc);
1136 1137

		if (rx->skb->len < 8 + hdrlen)
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1138
			return RX_DROP_UNUSABLE; /* TODO: count this? */
1139 1140 1141 1142 1143

		/*
		 * no need to call ieee80211_wep_get_keyidx,
		 * it verifies a bunch of things we've done already
		 */
1144 1145
		skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
		keyidx = keyid >> 6;
1146

1147 1148 1149
		/* check per-station GTK first, if multicast packet */
		if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
			rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1150

1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
		/* if not found, try default key */
		if (!rx->key) {
			rx->key = rcu_dereference(rx->sdata->keys[keyidx]);

			/*
			 * RSNA-protected unicast frames should always be
			 * sent with pairwise or station-to-station keys,
			 * but for WEP we allow using a key index as well.
			 */
			if (rx->key &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
			    !is_multicast_ether_addr(hdr->addr1))
				rx->key = NULL;
		}
1166 1167
	}

1168
	if (rx->key) {
1169 1170 1171
		if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
			return RX_DROP_MONITOR;

1172
		rx->key->tx_rx_count++;
1173
		/* TODO: add threshold stuff again */
1174
	} else {
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1175
		return RX_DROP_MONITOR;
1176 1177
	}

1178 1179 1180
	switch (rx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1181 1182
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
1183
	case WLAN_CIPHER_SUITE_TKIP:
1184 1185
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
1186
	case WLAN_CIPHER_SUITE_CCMP:
1187 1188
		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
1189
	case WLAN_CIPHER_SUITE_AES_CMAC:
1190 1191
		result = ieee80211_crypto_aes_cmac_decrypt(rx);
		break;
1192 1193 1194 1195 1196 1197
	default:
		/*
		 * We can reach here only with HW-only algorithms
		 * but why didn't it decrypt the frame?!
		 */
		return RX_DROP_UNUSABLE;
1198 1199
	}

1200 1201
	/* the hdr variable is invalid after the decrypt handlers */

1202
	/* either the frame has been decrypted or will be dropped */
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1203
	status->flag |= RX_FLAG_DECRYPTED;
1204 1205

	return result;
1206 1207
}

1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
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;
}

1241
static void sta_ps_start(struct sta_info *sta)
1242
{
1243
	struct ieee80211_sub_if_data *sdata = sta->sdata;
1244
	struct ieee80211_local *local = sdata->local;
1245
	struct ps_data *ps;
1246

1247 1248 1249 1250 1251 1252 1253
	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);
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1254
	set_sta_flag(sta, WLAN_STA_PS_STA);
1255 1256
	if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
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1257 1258
	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1259 1260
}

1261
static void sta_ps_end(struct sta_info *sta)
1262
{
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1263 1264
	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1265

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1266
	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
J
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1267 1268
		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
		       sta->sta.addr, sta->sta.aid);
1269 1270 1271 1272
		return;
	}

	ieee80211_sta_ps_deliver_wakeup(sta);
1273 1274
}

1275 1276 1277 1278 1279 1280 1281 1282
int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
{
	struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
	bool in_ps;

	WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));

	/* Don't let the same PS state be set twice */
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1283
	in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1284 1285 1286 1287
	if ((start && in_ps) || (!start && !in_ps))
		return -EINVAL;

	if (start)
1288
		sta_ps_start(sta_inf);
1289
	else
1290
		sta_ps_end(sta_inf);
1291 1292 1293 1294 1295

	return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);

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1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
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);
	int tid, ac;

	if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
		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 (sdata->local->hw.flags & IEEE80211_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 ...
	 */
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1324
	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
J
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1325 1326 1327
		return RX_CONTINUE;

	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
J
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1328 1329
		if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
			if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1330 1331
				ieee80211_sta_ps_deliver_poll_response(rx->sta);
			else
J
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1332
				set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1333
		}
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1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358

		/* 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))) {
		tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
		ac = ieee802_1d_to_ac[tid & 7];

		/*
		 * If this AC is not trigger-enabled do nothing.
		 *
		 * 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 (!(rx->sta->sta.uapsd_queues & BIT(ac)))
			return RX_CONTINUE;

		/* if we are in a service period, do nothing */
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1359
		if (test_sta_flag(rx->sta, WLAN_STA_SP))
J
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1360 1361
			return RX_CONTINUE;

J
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1362
		if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
J
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1363 1364
			ieee80211_sta_ps_deliver_uapsd(rx->sta);
		else
J
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1365
			set_sta_flag(rx->sta, WLAN_STA_UAPSD);
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1366 1367 1368 1369 1370
	}

	return RX_CONTINUE;
}

1371
static ieee80211_rx_result debug_noinline
1372
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1373 1374
{
	struct sta_info *sta = rx->sta;
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1375 1376 1377
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1378 1379

	if (!sta)
1380
		return RX_CONTINUE;
1381

J
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1382 1383
	/*
	 * Update last_rx only for IBSS packets which are for the current
1384 1385 1386 1387 1388
	 * 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.
J
Johannes Berg 已提交
1389
	 */
1390
	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1391
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1392
						NL80211_IFTYPE_ADHOC);
1393 1394
		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1395
			sta->last_rx = jiffies;
1396 1397 1398
			if (ieee80211_is_data(hdr->frame_control)) {
				sta->last_rx_rate_idx = status->rate_idx;
				sta->last_rx_rate_flag = status->flag;
1399
				sta->last_rx_rate_vht_nss = status->vht_nss;
1400 1401
			}
		}
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1402 1403
	} else if (!is_multicast_ether_addr(hdr->addr1)) {
		/*
1404 1405
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
1406
		 */
J
Johannes Berg 已提交
1407
		sta->last_rx = jiffies;
1408 1409 1410
		if (ieee80211_is_data(hdr->frame_control)) {
			sta->last_rx_rate_idx = status->rate_idx;
			sta->last_rx_rate_flag = status->flag;
1411
			sta->last_rx_rate_vht_nss = status->vht_nss;
1412
		}
1413 1414
	}

1415
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1416
		return RX_CONTINUE;
1417

1418 1419 1420
	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
		ieee80211_sta_rx_notify(rx->sdata, hdr);

1421 1422
	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
1423 1424 1425 1426
	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
		sta->last_signal = status->signal;
		ewma_add(&sta->avg_signal, -status->signal);
	}
1427

1428 1429 1430 1431
	/*
	 * Change STA power saving mode only at the end of a frame
	 * exchange sequence.
	 */
1432 1433
	if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
	    !ieee80211_has_morefrags(hdr->frame_control) &&
1434
	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1435 1436
	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
J
Johannes Berg 已提交
1437
		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
			/*
			 * Ignore doze->wake transitions that are
			 * indicated by non-data frames, the standard
			 * is unclear here, but for example going to
			 * PS mode and then scanning would cause a
			 * doze->wake transition for the probe request,
			 * and that is clearly undesirable.
			 */
			if (ieee80211_is_data(hdr->frame_control) &&
			    !ieee80211_has_pm(hdr->frame_control))
1448
				sta_ps_end(sta);
1449 1450
		} else {
			if (ieee80211_has_pm(hdr->frame_control))
1451
				sta_ps_start(sta);
1452
		}
1453 1454
	}

1455 1456 1457 1458 1459 1460
	/*
	 * Drop (qos-)data::nullfunc frames silently, since they
	 * are used only to control station power saving mode.
	 */
	if (ieee80211_is_nullfunc(hdr->frame_control) ||
	    ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1461
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1462 1463 1464

		/*
		 * If we receive a 4-addr nullfunc frame from a STA
1465 1466 1467
		 * 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.
1468 1469 1470 1471
		 */
		if (ieee80211_has_a4(hdr->frame_control) &&
		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1472 1473 1474 1475 1476
		      !rx->sdata->u.vlan.sta))) {
			if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
				cfg80211_rx_unexpected_4addr_frame(
					rx->sdata->dev, sta->sta.addr,
					GFP_ATOMIC);
1477
			return RX_DROP_MONITOR;
1478
		}
1479 1480 1481 1482
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
1483 1484
		sta->rx_packets++;
		dev_kfree_skb(rx->skb);
1485
		return RX_QUEUED;
1486 1487
	}

1488
	return RX_CONTINUE;
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
} /* ieee80211_rx_h_sta_process */

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
			 unsigned int frag, unsigned int seq, int rx_queue,
			 struct sk_buff **skb)
{
	struct ieee80211_fragment_entry *entry;

	entry = &sdata->fragments[sdata->fragment_next++];
	if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
		sdata->fragment_next = 0;

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1502
	if (!skb_queue_empty(&entry->skb_list))
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
		__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->ccmp = 0;
	entry->extra_len = 0;

	return entry;
}

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1519
			  unsigned int frag, unsigned int seq,
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
			  int rx_queue, struct ieee80211_hdr *hdr)
{
	struct ieee80211_fragment_entry *entry;
	int i, idx;

	idx = sdata->fragment_next;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		struct ieee80211_hdr *f_hdr;

		idx--;
		if (idx < 0)
			idx = IEEE80211_FRAGMENT_MAX - 1;

		entry = &sdata->fragments[idx];
		if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
		    entry->rx_queue != rx_queue ||
		    entry->last_frag + 1 != frag)
			continue;

1539
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1540

1541 1542 1543 1544 1545
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1546 1547
		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1548 1549
			continue;

1550
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1551 1552 1553 1554 1555 1556 1557 1558 1559
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

1560
static ieee80211_rx_result debug_noinline
1561
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1562 1563 1564
{
	struct ieee80211_hdr *hdr;
	u16 sc;
1565
	__le16 fc;
1566 1567 1568
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
1569
	struct ieee80211_rx_status *status;
1570

1571
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1572
	fc = hdr->frame_control;
1573 1574 1575 1576

	if (ieee80211_is_ctl(fc))
		return RX_CONTINUE;

1577 1578 1579
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

1580
	if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1581 1582 1583 1584 1585 1586
		   is_multicast_ether_addr(hdr->addr1))) {
		/* not fragmented */
		goto out;
	}
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

Z
Zhu Yi 已提交
1587 1588 1589
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;

1590 1591 1592 1593 1594 1595
	/*
	 *  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;
1596 1597 1598 1599 1600
	seq = (sc & IEEE80211_SCTL_SEQ) >> 4;

	if (frag == 0) {
		/* This is the first fragment of a new frame. */
		entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1601
						 rx->seqno_idx, &(rx->skb));
1602
		if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1603
		    ieee80211_has_protected(fc)) {
1604
			int queue = rx->security_idx;
1605 1606 1607 1608
			/* Store CCMP PN so that we can verify that the next
			 * fragment has a sequential PN value. */
			entry->ccmp = 1;
			memcpy(entry->last_pn,
1609
			       rx->key->u.ccmp.rx_pn[queue],
1610 1611
			       CCMP_PN_LEN);
		}
1612
		return RX_QUEUED;
1613 1614 1615 1616 1617
	}

	/* 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.
	 */
1618 1619
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
					  rx->seqno_idx, hdr);
1620 1621
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
1622
		return RX_DROP_MONITOR;
1623 1624 1625 1626 1627 1628 1629
	}

	/* Verify that MPDUs within one MSDU have sequential PN values.
	 * (IEEE 802.11i, 8.3.3.4.5) */
	if (entry->ccmp) {
		int i;
		u8 pn[CCMP_PN_LEN], *rpn;
1630
		int queue;
1631
		if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
J
Johannes Berg 已提交
1632
			return RX_DROP_UNUSABLE;
1633 1634 1635 1636 1637 1638
		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
1639
		queue = rx->security_idx;
1640
		rpn = rx->key->u.ccmp.rx_pn[queue];
1641
		if (memcmp(pn, rpn, CCMP_PN_LEN))
J
Johannes Berg 已提交
1642
			return RX_DROP_UNUSABLE;
1643 1644 1645
		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
	}

1646
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
1647 1648 1649
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
1650
	if (ieee80211_has_morefrags(fc)) {
1651
		rx->skb = NULL;
1652
		return RX_QUEUED;
1653 1654 1655 1656 1657 1658 1659 1660 1661
	}

	rx->skb = __skb_dequeue(&entry->skb_list);
	if (skb_tailroom(rx->skb) < entry->extra_len) {
		I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
		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);
J
Johannes Berg 已提交
1662
			return RX_DROP_UNUSABLE;
1663 1664 1665 1666 1667 1668 1669 1670
		}
	}
	while ((skb = __skb_dequeue(&entry->skb_list))) {
		memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
		dev_kfree_skb(skb);
	}

	/* Complete frame has been reassembled - process it now */
1671 1672
	status = IEEE80211_SKB_RXCB(rx->skb);
	status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1673 1674 1675 1676 1677 1678 1679 1680

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
1681
	return RX_CONTINUE;
1682 1683
}

J
Johannes Berg 已提交
1684
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1685
{
J
Johannes Berg 已提交
1686
	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1687
		return -EACCES;
1688

1689
	return 0;
1690 1691
}

J
Johannes Berg 已提交
1692
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1693
{
J
Johannes Berg 已提交
1694 1695 1696
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

1697
	/*
1698 1699
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1700
	 */
J
Johannes Berg 已提交
1701
	if (status->flag & RX_FLAG_DECRYPTED)
1702
		return 0;
1703 1704

	/* Drop unencrypted frames if key is set. */
1705 1706
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
1707
		     ieee80211_is_data(fc) &&
1708
		     (rx->key || rx->sdata->drop_unencrypted)))
1709
		return -EACCES;
1710 1711 1712 1713

	return 0;
}

J
Johannes Berg 已提交
1714
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1715 1716
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1717
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1718 1719
	__le16 fc = hdr->frame_control;

1720 1721 1722 1723 1724 1725
	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return 0;
1726

J
Johannes Berg 已提交
1727
	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1728 1729
		if (unlikely(!ieee80211_has_protected(fc) &&
			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1730 1731 1732 1733 1734 1735 1736 1737 1738
			     rx->key)) {
			if (ieee80211_is_deauth(fc))
				cfg80211_send_unprot_deauth(rx->sdata->dev,
							    rx->skb->data,
							    rx->skb->len);
			else if (ieee80211_is_disassoc(fc))
				cfg80211_send_unprot_disassoc(rx->sdata->dev,
							      rx->skb->data,
							      rx->skb->len);
1739
			return -EACCES;
1740
		}
1741
		/* BIP does not use Protected field, so need to check MMIE */
1742
		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1743 1744 1745 1746 1747 1748 1749 1750 1751
			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
			if (ieee80211_is_deauth(fc))
				cfg80211_send_unprot_deauth(rx->sdata->dev,
							    rx->skb->data,
							    rx->skb->len);
			else if (ieee80211_is_disassoc(fc))
				cfg80211_send_unprot_disassoc(rx->sdata->dev,
							      rx->skb->data,
							      rx->skb->len);
1752
			return -EACCES;
1753
		}
1754 1755 1756 1757 1758 1759 1760 1761 1762
		/*
		 * 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(
				     (struct ieee80211_hdr *) rx->skb->data)))
			return -EACCES;
	}
1763

1764
	return 0;
1765 1766
}

1767
static int
1768
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1769
{
J
Johannes Berg 已提交
1770
	struct ieee80211_sub_if_data *sdata = rx->sdata;
1771
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1772 1773 1774
	bool check_port_control = false;
	struct ethhdr *ehdr;
	int ret;
1775

1776
	*port_control = false;
1777 1778
	if (ieee80211_has_a4(hdr->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1779
		return -1;
1780

1781 1782 1783 1784 1785 1786 1787 1788 1789
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {

		if (!sdata->u.mgd.use_4addr)
			return -1;
		else
			check_port_control = true;
	}

1790
	if (is_multicast_ether_addr(hdr->addr1) &&
1791
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1792
		return -1;
1793

1794
	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1795
	if (ret < 0)
1796 1797 1798
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
1799 1800 1801
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
1802 1803 1804
		return -1;

	return 0;
1805
}
1806

1807 1808 1809
/*
 * requires that rx->skb is a frame with ethernet header
 */
1810
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1811
{
1812
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1813 1814 1815 1816 1817 1818 1819
		= { 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.
	 */
1820
	if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1821 1822
	    (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
	     ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1823 1824 1825
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
1826
	    ieee80211_drop_unencrypted(rx, fc))
1827 1828 1829 1830 1831 1832 1833 1834
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
1835
static void
1836
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1837
{
J
Johannes Berg 已提交
1838 1839
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct net_device *dev = sdata->dev;
1840
	struct sk_buff *skb, *xmit_skb;
1841 1842
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1843
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1844

1845 1846
	skb = rx->skb;
	xmit_skb = NULL;
1847

1848 1849
	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1850
	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1851
	    (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1852
	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1853 1854 1855 1856 1857
		if (is_multicast_ether_addr(ehdr->h_dest)) {
			/*
			 * send multicast frames both to higher layers in
			 * local net stack and back to the wireless medium
			 */
1858
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
1859
			if (!xmit_skb)
J
Johannes Berg 已提交
1860
				net_info_ratelimited("%s: failed to clone multicast frame\n",
1861
						    dev->name);
1862
		} else {
1863 1864
			dsta = sta_info_get(sdata, skb->data);
			if (dsta) {
1865 1866 1867 1868 1869
				/*
				 * 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.
1870
				 */
1871
				xmit_skb = skb;
1872 1873 1874 1875 1876 1877
				skb = NULL;
			}
		}
	}

	if (skb) {
1878 1879
		int align __maybe_unused;

1880
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1881 1882 1883 1884 1885 1886 1887
		/*
		 * '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. That also explains the __skb_push()
		 * below.
		 */
1888
		align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1889 1890 1891 1892 1893 1894
		if (align) {
			if (WARN_ON(skb_headroom(skb) < 3)) {
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				u8 *data = skb->data;
1895 1896 1897 1898
				size_t len = skb_headlen(skb);
				skb->data -= align;
				memmove(skb->data, data, len);
				skb_set_tail_pointer(skb, len);
1899 1900 1901 1902 1903 1904 1905 1906
			}
		}
#endif

		if (skb) {
			/* deliver to local stack */
			skb->protocol = eth_type_trans(skb, dev);
			memset(skb->cb, 0, sizeof(skb->cb));
1907
			netif_receive_skb(skb);
1908
		}
1909 1910
	}

1911
	if (xmit_skb) {
1912 1913 1914 1915 1916 1917
		/*
		 * 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;
1918
		xmit_skb->protocol = htons(ETH_P_802_3);
1919 1920
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1921
		dev_queue_xmit(xmit_skb);
1922
	}
1923 1924
}

1925
static ieee80211_rx_result debug_noinline
1926
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1927
{
J
Johannes Berg 已提交
1928
	struct net_device *dev = rx->sdata->dev;
Z
Zhu Yi 已提交
1929
	struct sk_buff *skb = rx->skb;
1930 1931
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
Z
Zhu Yi 已提交
1932
	struct sk_buff_head frame_list;
1933
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1934

1935
	if (unlikely(!ieee80211_is_data(fc)))
1936
		return RX_CONTINUE;
1937

1938
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
1939
		return RX_DROP_MONITOR;
1940

1941
	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1942
		return RX_CONTINUE;
1943

Z
Zhu Yi 已提交
1944 1945 1946
	if (ieee80211_has_a4(hdr->frame_control) &&
	    rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	    !rx->sdata->u.vlan.sta)
J
Johannes Berg 已提交
1947
		return RX_DROP_UNUSABLE;
1948

Z
Zhu Yi 已提交
1949 1950 1951 1952 1953
	if (is_multicast_ether_addr(hdr->addr1) &&
	    ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	      rx->sdata->u.vlan.sta) ||
	     (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
	      rx->sdata->u.mgd.use_4addr)))
J
Johannes Berg 已提交
1954
		return RX_DROP_UNUSABLE;
1955

Z
Zhu Yi 已提交
1956 1957
	skb->dev = dev;
	__skb_queue_head_init(&frame_list);
1958

Z
Zhu Yi 已提交
1959 1960 1961
	if (skb_linearize(skb))
		return RX_DROP_UNUSABLE;

Z
Zhu Yi 已提交
1962 1963
	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
1964
				 rx->local->hw.extra_tx_headroom, true);
1965

Z
Zhu Yi 已提交
1966 1967
	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);
1968

1969
		if (!ieee80211_frame_allowed(rx, fc)) {
Z
Zhu Yi 已提交
1970
			dev_kfree_skb(rx->skb);
1971 1972
			continue;
		}
Z
Zhu Yi 已提交
1973 1974
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += rx->skb->len;
1975 1976 1977 1978

		ieee80211_deliver_skb(rx);
	}

1979
	return RX_QUEUED;
1980 1981
}

I
Ingo Molnar 已提交
1982
#ifdef CONFIG_MAC80211_MESH
1983
static ieee80211_rx_result
1984 1985
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
1986 1987
	struct ieee80211_hdr *fwd_hdr, *hdr;
	struct ieee80211_tx_info *info;
1988 1989
	struct ieee80211s_hdr *mesh_hdr;
	struct sk_buff *skb = rx->skb, *fwd_skb;
J
Johannes Berg 已提交
1990
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
1991
	struct ieee80211_sub_if_data *sdata = rx->sdata;
1992
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1993
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1994
	__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1995
	u16 q, hdrlen;
1996 1997 1998

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012

	/* make sure fixed part of mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb, hdrlen + 6))
		return RX_DROP_MONITOR;

	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

	/* make sure full mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb,
			   hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
		return RX_DROP_MONITOR;

	/* reload pointers */
	hdr = (struct ieee80211_hdr *) skb->data;
2013 2014
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

2015 2016 2017 2018 2019 2020
	/* frame is in RMC, don't forward */
	if (ieee80211_is_data(hdr->frame_control) &&
	    is_multicast_ether_addr(hdr->addr1) &&
	    mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
		return RX_DROP_MONITOR;

2021 2022
	if (!ieee80211_is_data(hdr->frame_control) ||
	    !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2023 2024 2025 2026 2027
		return RX_CONTINUE;

	if (!mesh_hdr->ttl)
		return RX_DROP_MONITOR;

2028
	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2029
		struct mesh_path *mppath;
2030 2031 2032 2033 2034 2035
		char *proxied_addr;
		char *mpp_addr;

		if (is_multicast_ether_addr(hdr->addr1)) {
			mpp_addr = hdr->addr3;
			proxied_addr = mesh_hdr->eaddr1;
2036 2037
		} else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
			/* has_a4 already checked in ieee80211_rx_mesh_check */
2038 2039
			mpp_addr = hdr->addr4;
			proxied_addr = mesh_hdr->eaddr2;
2040 2041
		} else {
			return RX_DROP_MONITOR;
2042
		}
2043 2044

		rcu_read_lock();
2045
		mppath = mpp_path_lookup(proxied_addr, sdata);
2046
		if (!mppath) {
2047
			mpp_path_add(proxied_addr, mpp_addr, sdata);
2048 2049
		} else {
			spin_lock_bh(&mppath->state_lock);
2050
			if (!ether_addr_equal(mppath->mpp, mpp_addr))
2051
				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2052 2053 2054 2055 2056
			spin_unlock_bh(&mppath->state_lock);
		}
		rcu_read_unlock();
	}

2057 2058
	/* Frame has reached destination.  Don't forward */
	if (!is_multicast_ether_addr(hdr->addr1) &&
2059
	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
2060 2061
		return RX_CONTINUE;

Y
Yoni Divinsky 已提交
2062
	q = ieee80211_select_queue_80211(sdata, skb, hdr);
2063
	if (ieee80211_queue_stopped(&local->hw, q)) {
2064
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2065 2066 2067
		return RX_DROP_MONITOR;
	}
	skb_set_queue_mapping(skb, q);
2068

2069 2070
	if (!--mesh_hdr->ttl) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2071
		goto out;
2072 2073
	}

2074 2075 2076
	if (!ifmsh->mshcfg.dot11MeshForwarding)
		goto out;

2077 2078
	fwd_skb = skb_copy(skb, GFP_ATOMIC);
	if (!fwd_skb) {
J
Johannes Berg 已提交
2079
		net_info_ratelimited("%s: failed to clone mesh frame\n",
2080
				    sdata->name);
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097
		goto out;
	}

	fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
	info = IEEE80211_SKB_CB(fwd_skb);
	memset(info, 0, sizeof(*info));
	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
	info->control.vif = &rx->sdata->vif;
	info->control.jiffies = jiffies;
	if (is_multicast_ether_addr(fwd_hdr->addr1)) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
		memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
	} else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	} else {
		/* unable to resolve next hop */
		mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
J
Johannes Berg 已提交
2098
				   0, reason, fwd_hdr->addr2, sdata);
2099
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2100
		kfree_skb(fwd_skb);
2101
		return RX_DROP_MONITOR;
2102 2103
	}

2104 2105
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_add_pending_skb(local, fwd_skb);
J
Johannes Berg 已提交
2106
 out:
2107
	if (is_multicast_ether_addr(hdr->addr1) ||
J
Johannes Berg 已提交
2108
	    sdata->dev->flags & IFF_PROMISC)
2109 2110 2111 2112
		return RX_CONTINUE;
	else
		return RX_DROP_MONITOR;
}
I
Ingo Molnar 已提交
2113
#endif
2114

2115
static ieee80211_rx_result debug_noinline
2116
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2117
{
J
Johannes Berg 已提交
2118
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2119
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2120
	struct net_device *dev = sdata->dev;
2121 2122
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
2123
	bool port_control;
2124
	int err;
2125

2126
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2127
		return RX_CONTINUE;
2128

2129
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
2130
		return RX_DROP_MONITOR;
2131

2132
	/*
2133 2134
	 * Send unexpected-4addr-frame event to hostapd. For older versions,
	 * also drop the frame to cooked monitor interfaces.
2135 2136
	 */
	if (ieee80211_has_a4(hdr->frame_control) &&
2137 2138 2139 2140 2141
	    sdata->vif.type == NL80211_IFTYPE_AP) {
		if (rx->sta &&
		    !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
			cfg80211_rx_unexpected_4addr_frame(
				rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2142
		return RX_DROP_MONITOR;
2143
	}
2144

2145
	err = __ieee80211_data_to_8023(rx, &port_control);
2146
	if (unlikely(err))
J
Johannes Berg 已提交
2147
		return RX_DROP_UNUSABLE;
2148

2149
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
2150
		return RX_DROP_MONITOR;
2151

2152 2153 2154 2155 2156 2157 2158 2159
	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;
	}

2160 2161 2162 2163 2164
	rx->skb->dev = dev;

	dev->stats.rx_packets++;
	dev->stats.rx_bytes += rx->skb->len;

2165
	if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2166 2167 2168 2169
	    !is_multicast_ether_addr(
		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
	    (!local->scanning &&
	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2170 2171 2172 2173
			mod_timer(&local->dynamic_ps_timer, jiffies +
			 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
	}

2174
	ieee80211_deliver_skb(rx);
2175

2176
	return RX_QUEUED;
2177 2178
}

2179
static ieee80211_rx_result debug_noinline
2180
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2181 2182
{
	struct sk_buff *skb = rx->skb;
2183
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2184 2185 2186 2187
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

2188
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
2189
		return RX_CONTINUE;
2190

2191
	if (ieee80211_is_back_req(bar->frame_control)) {
2192 2193 2194 2195
		struct {
			__le16 control, start_seq_num;
		} __packed bar_data;

2196
		if (!rx->sta)
2197
			return RX_DROP_MONITOR;
2198 2199 2200 2201 2202 2203

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

		tid = le16_to_cpu(bar_data.control) >> 12;
2204 2205 2206

		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
2207
			return RX_DROP_MONITOR;
2208

2209
		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2210 2211

		/* reset session timer */
2212 2213 2214
		if (tid_agg_rx->timeout)
			mod_timer(&tid_agg_rx->session_timer,
				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2215

2216
		spin_lock(&tid_agg_rx->reorder_lock);
2217
		/* release stored frames up to start of BAR */
2218 2219
		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
						 start_seq_num);
2220 2221
		spin_unlock(&tid_agg_rx->reorder_lock);

2222 2223
		kfree_skb(skb);
		return RX_QUEUED;
2224 2225
	}

2226 2227 2228 2229 2230 2231
	/*
	 * After this point, we only want management frames,
	 * so we can drop all remaining control frames to
	 * cooked monitor interfaces.
	 */
	return RX_DROP_MONITOR;
2232 2233
}

2234 2235 2236
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_mgmt *mgmt,
					   size_t len)
2237 2238 2239 2240 2241
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;

2242
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2243 2244 2245 2246
		/* Not to own unicast address */
		return;
	}

2247 2248
	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2249
		/* Not from the current AP or not associated yet. */
2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
		return;
	}

	if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
		/* Too short SA Query request frame */
		return;
	}

	skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
	if (skb == NULL)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(resp, 0, 24);
	memcpy(resp->da, mgmt->sa, ETH_ALEN);
2266
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2267
	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2268 2269 2270 2271 2272 2273 2274 2275 2276
	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);
	skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
	resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
	memcpy(resp->u.action.u.sa_query.trans_id,
	       mgmt->u.action.u.sa_query.trans_id,
	       WLAN_SA_QUERY_TR_ID_LEN);

2277
	ieee80211_tx_skb(sdata, skb);
2278 2279
}

2280 2281 2282 2283
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;
2284
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296

	/*
	 * From here on, look only at management frames.
	 * Data and control frames are already handled,
	 * and unknown (reserved) frames are useless.
	 */
	if (rx->skb->len < 24)
		return RX_DROP_MONITOR;

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

J
Johannes Berg 已提交
2297 2298 2299
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2300 2301 2302 2303 2304
		int sig = 0;

		if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
			sig = status->signal;

J
Johannes Berg 已提交
2305 2306
		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
					    rx->skb->data, rx->skb->len,
2307
					    status->freq, sig);
J
Johannes Berg 已提交
2308 2309 2310
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

2311
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2312 2313 2314 2315 2316 2317 2318 2319
		return RX_DROP_MONITOR;

	if (ieee80211_drop_unencrypted_mgmt(rx))
		return RX_DROP_UNUSABLE;

	return RX_CONTINUE;
}

2320 2321 2322 2323
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2324
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2325
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2326
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2327 2328 2329 2330 2331
	int len = rx->skb->len;

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

2332 2333
	/* drop too small frames */
	if (len < IEEE80211_MIN_ACTION_SIZE)
2334
		return RX_DROP_UNUSABLE;
2335

2336
	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2337
		return RX_DROP_UNUSABLE;
2338

2339
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2340
		return RX_DROP_UNUSABLE;
2341

2342
	switch (mgmt->u.action.category) {
2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
	case WLAN_CATEGORY_HT:
		/* reject HT action frames from stations not supporting HT */
		if (!rx->sta->sta.ht_cap.ht_supported)
			goto invalid;

		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

		/* verify action & smps_control are present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 2)
			goto invalid;

		switch (mgmt->u.action.u.ht_smps.action) {
		case WLAN_HT_ACTION_SMPS: {
			struct ieee80211_supported_band *sband;
			u8 smps;

			/* convert to HT capability */
			switch (mgmt->u.action.u.ht_smps.smps_control) {
			case WLAN_HT_SMPS_CONTROL_DISABLED:
				smps = WLAN_HT_CAP_SM_PS_DISABLED;
				break;
			case WLAN_HT_SMPS_CONTROL_STATIC:
				smps = WLAN_HT_CAP_SM_PS_STATIC;
				break;
			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
				smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
				break;
			default:
				goto invalid;
			}
			smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;

			/* if no change do nothing */
			if ((rx->sta->sta.ht_cap.cap &
					IEEE80211_HT_CAP_SM_PS) == smps)
				goto handled;

			rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
			rx->sta->sta.ht_cap.cap |= smps;

			sband = rx->local->hw.wiphy->bands[status->band];

2390 2391
			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_SMPS_CHANGED);
2392 2393 2394 2395 2396 2397 2398
			goto handled;
		}
		default:
			goto invalid;
		}

		break;
2399
	case WLAN_CATEGORY_BACK:
2400
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2401
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2402
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2403 2404
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2405
			break;
2406

2407 2408 2409 2410
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2411 2412 2413 2414
		switch (mgmt->u.action.u.addba_req.action_code) {
		case WLAN_ACTION_ADDBA_REQ:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_req)))
2415 2416
				goto invalid;
			break;
2417 2418 2419
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
2420 2421
				goto invalid;
			break;
2422 2423 2424
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
2425 2426 2427 2428
				goto invalid;
			break;
		default:
			goto invalid;
2429
		}
2430

2431
		goto queue;
2432
	case WLAN_CATEGORY_SPECTRUM_MGMT:
2433
		if (status->band != IEEE80211_BAND_5GHZ)
2434
			break;
2435 2436

		if (sdata->vif.type != NL80211_IFTYPE_STATION)
2437
			break;
2438

2439 2440 2441 2442
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2443 2444 2445 2446
		switch (mgmt->u.action.u.measurement.action_code) {
		case WLAN_ACTION_SPCT_MSR_REQ:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.measurement)))
2447
				break;
2448
			ieee80211_process_measurement_req(sdata, mgmt, len);
2449
			goto handled;
S
Sujith 已提交
2450 2451 2452
		case WLAN_ACTION_SPCT_CHL_SWITCH:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.chan_switch)))
2453
				break;
S
Sujith 已提交
2454

2455
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2456
				break;
2457

2458
			if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2459
				break;
S
Sujith 已提交
2460

2461
			goto queue;
2462 2463
		}
		break;
2464 2465 2466
	case WLAN_CATEGORY_SA_QUERY:
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.sa_query)))
2467 2468
			break;

2469 2470 2471
		switch (mgmt->u.action.u.sa_query.action) {
		case WLAN_ACTION_SA_QUERY_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2472
				break;
2473
			ieee80211_process_sa_query_req(sdata, mgmt, len);
2474
			goto handled;
2475 2476
		}
		break;
2477
	case WLAN_CATEGORY_SELF_PROTECTED:
2478 2479 2480 2481
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.self_prot.action_code)))
			break;

2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
		switch (mgmt->u.action.u.self_prot.action_code) {
		case WLAN_SP_MESH_PEERING_OPEN:
		case WLAN_SP_MESH_PEERING_CLOSE:
		case WLAN_SP_MESH_PEERING_CONFIRM:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				goto invalid;
			if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
				/* 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;
2499
	case WLAN_CATEGORY_MESH_ACTION:
2500 2501 2502 2503
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
			break;

2504 2505
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
2506
		if (mesh_action_is_path_sel(mgmt) &&
J
Johannes Berg 已提交
2507
		    !mesh_path_sel_is_hwmp(sdata))
2508 2509
			break;
		goto queue;
2510
	}
2511

2512 2513
	return RX_CONTINUE;

2514
 invalid:
2515
	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
	/* will return in the next handlers */
	return RX_CONTINUE;

 handled:
	if (rx->sta)
		rx->sta->rx_packets++;
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;

 queue:
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&local->hw, &sdata->work);
	if (rx->sta)
		rx->sta->rx_packets++;
	return RX_QUEUED;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
2537
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2538
	int sig = 0;
2539 2540

	/* skip known-bad action frames and return them in the next handler */
2541
	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2542
		return RX_CONTINUE;
2543

2544 2545 2546 2547 2548 2549 2550
	/*
	 * 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.
	 */

2551 2552 2553
	if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
		sig = status->signal;

2554
	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572
			     rx->skb->data, rx->skb->len,
			     GFP_ATOMIC)) {
		if (rx->sta)
			rx->sta->rx_packets++;
		dev_kfree_skb(rx->skb);
		return RX_QUEUED;
	}

	return RX_CONTINUE;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
	struct sk_buff *nskb;
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2573
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2574 2575 2576 2577 2578 2579 2580 2581 2582

	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
2583
	 * 802.11-2012 9.24.4.
2584 2585 2586 2587
	 * Newer versions of hostapd shall also use the management frame
	 * registration mechanisms, but older ones still use cooked
	 * monitor interfaces so push all frames there.
	 */
2588
	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2589 2590 2591
	    (sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
		return RX_DROP_MONITOR;
2592

2593 2594 2595
	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_MONITOR;

2596 2597 2598 2599 2600 2601 2602
	/* do not return rejected action frames */
	if (mgmt->u.action.category & 0x80)
		return RX_DROP_UNUSABLE;

	nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
			       GFP_ATOMIC);
	if (nskb) {
2603
		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2604

2605 2606 2607
		nmgmt->u.action.category |= 0x80;
		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2608 2609 2610 2611

		memset(nskb->cb, 0, sizeof(nskb->cb));

		ieee80211_tx_skb(rx->sdata, nskb);
2612
	}
2613 2614
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
2615 2616
}

2617
static ieee80211_rx_result debug_noinline
2618
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2619
{
J
Johannes Berg 已提交
2620
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2621 2622
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 stype;
2623

2624
	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2625

2626 2627 2628 2629
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
	    sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_MONITOR;
2630

2631
	switch (stype) {
J
Johannes Berg 已提交
2632
	case cpu_to_le16(IEEE80211_STYPE_AUTH):
2633 2634 2635 2636
	case cpu_to_le16(IEEE80211_STYPE_BEACON):
	case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
		/* process for all: mesh, mlme, ibss */
		break;
J
Johannes Berg 已提交
2637 2638
	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2639 2640
	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2641 2642 2643 2644
		if (is_multicast_ether_addr(mgmt->da) &&
		    !is_broadcast_ether_addr(mgmt->da))
			return RX_DROP_MONITOR;

2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656
		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_MONITOR;
		break;
	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
		/* process only for ibss */
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
			return RX_DROP_MONITOR;
		break;
	default:
		return RX_DROP_MONITOR;
	}
2657

2658
	/* queue up frame and kick off work to process it */
2659
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2660 2661
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&rx->local->hw, &sdata->work);
2662 2663
	if (rx->sta)
		rx->sta->rx_packets++;
2664

2665
	return RX_QUEUED;
2666 2667
}

2668
/* TODO: use IEEE80211_RX_FRAGMENTED */
J
Johannes Berg 已提交
2669 2670
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
					struct ieee80211_rate *rate)
2671 2672 2673 2674 2675
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb = rx->skb, *skb2;
	struct net_device *prev_dev = NULL;
J
Johannes Berg 已提交
2676
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2677
	int needed_headroom;
2678

2679 2680 2681 2682 2683
	/*
	 * If cooked monitor has been processed already, then
	 * don't do it again. If not, set the flag.
	 */
	if (rx->flags & IEEE80211_RX_CMNTR)
2684
		goto out_free_skb;
2685
	rx->flags |= IEEE80211_RX_CMNTR;
2686

2687 2688 2689 2690
	/* If there are no cooked monitor interfaces, just free the SKB */
	if (!local->cooked_mntrs)
		goto out_free_skb;

2691
	/* room for the radiotap header based on driver features */
2692
	needed_headroom = ieee80211_rx_radiotap_space(local, status);
2693

2694 2695 2696
	if (skb_headroom(skb) < needed_headroom &&
	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
		goto out_free_skb;
2697

2698
	/* prepend radiotap information */
2699 2700
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 false);
2701 2702 2703 2704 2705 2706 2707

	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2708
		if (!ieee80211_sdata_running(sdata))
2709 2710
			continue;

2711
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2712 2713 2714 2715 2716 2717 2718
		    !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
			continue;

		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
2719
				netif_receive_skb(skb2);
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729
			}
		}

		prev_dev = sdata->dev;
		sdata->dev->stats.rx_packets++;
		sdata->dev->stats.rx_bytes += skb->len;
	}

	if (prev_dev) {
		skb->dev = prev_dev;
2730
		netif_receive_skb(skb);
2731 2732
		return;
	}
2733 2734 2735 2736 2737

 out_free_skb:
	dev_kfree_skb(skb);
}

2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
					 ieee80211_rx_result res)
{
	switch (res) {
	case RX_DROP_MONITOR:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		/* fall through */
	case RX_CONTINUE: {
		struct ieee80211_rate *rate = NULL;
		struct ieee80211_supported_band *sband;
		struct ieee80211_rx_status *status;

		status = IEEE80211_SKB_RXCB((rx->skb));

		sband = rx->local->hw.wiphy->bands[status->band];
2755 2756
		if (!(status->flag & RX_FLAG_HT) &&
		    !(status->flag & RX_FLAG_VHT))
2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772
			rate = &sband->bitrates[status->rate_idx];

		ieee80211_rx_cooked_monitor(rx, rate);
		break;
		}
	case RX_DROP_UNUSABLE:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		dev_kfree_skb(rx->skb);
		break;
	case RX_QUEUED:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
		break;
	}
}
2773

2774
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2775 2776
{
	ieee80211_rx_result res = RX_DROP_MONITOR;
2777
	struct sk_buff *skb;
2778

2779 2780 2781 2782
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
2783
			goto rxh_next;  \
2784
	} while (0);
2785

2786 2787 2788 2789 2790 2791 2792 2793 2794
	spin_lock(&rx->local->rx_skb_queue.lock);
	if (rx->local->running_rx_handler)
		goto unlock;

	rx->local->running_rx_handler = true;

	while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
		spin_unlock(&rx->local->rx_skb_queue.lock);

2795 2796 2797 2798 2799 2800 2801 2802 2803
		/*
		 * all the other fields are valid across frames
		 * that belong to an aMPDU since they are on the
		 * same TID from the same station
		 */
		rx->skb = skb;

		CALL_RXH(ieee80211_rx_h_decrypt)
		CALL_RXH(ieee80211_rx_h_check_more_data)
J
Johannes Berg 已提交
2804
		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2805 2806 2807 2808
		CALL_RXH(ieee80211_rx_h_sta_process)
		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 */
I
Ingo Molnar 已提交
2809
#ifdef CONFIG_MAC80211_MESH
2810
		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2811
			CALL_RXH(ieee80211_rx_h_mesh_fwding);
I
Ingo Molnar 已提交
2812
#endif
2813
		CALL_RXH(ieee80211_rx_h_amsdu)
2814
		CALL_RXH(ieee80211_rx_h_data)
2815
		CALL_RXH(ieee80211_rx_h_ctrl);
2816
		CALL_RXH(ieee80211_rx_h_mgmt_check)
2817
		CALL_RXH(ieee80211_rx_h_action)
2818 2819
		CALL_RXH(ieee80211_rx_h_userspace_mgmt)
		CALL_RXH(ieee80211_rx_h_action_return)
2820
		CALL_RXH(ieee80211_rx_h_mgmt)
2821

2822 2823
 rxh_next:
		ieee80211_rx_handlers_result(rx, res);
2824
		spin_lock(&rx->local->rx_skb_queue.lock);
2825
#undef CALL_RXH
2826
	}
2827 2828 2829 2830 2831

	rx->local->running_rx_handler = false;

 unlock:
	spin_unlock(&rx->local->rx_skb_queue.lock);
2832 2833
}

2834
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
{
	ieee80211_rx_result res = RX_DROP_MONITOR;

#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_next;  \
	} while (0);

	CALL_RXH(ieee80211_rx_h_check)

2847
	ieee80211_rx_reorder_ampdu(rx);
2848

2849
	ieee80211_rx_handlers(rx);
2850
	return;
2851

2852
 rxh_next:
2853 2854 2855
	ieee80211_rx_handlers_result(rx, res);

#undef CALL_RXH
2856 2857
}

2858
/*
2859 2860
 * This function makes calls into the RX path, therefore
 * it has to be invoked under RCU read lock.
2861 2862 2863
 */
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
2864 2865 2866 2867
	struct ieee80211_rx_data rx = {
		.sta = sta,
		.sdata = sta->sdata,
		.local = sta->local,
2868 2869 2870
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
2871
		.flags = 0,
2872
	};
2873 2874 2875 2876 2877
	struct tid_ampdu_rx *tid_agg_rx;

	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		return;
2878

2879
	spin_lock(&tid_agg_rx->reorder_lock);
2880
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2881
	spin_unlock(&tid_agg_rx->reorder_lock);
2882

2883
	ieee80211_rx_handlers(&rx);
2884 2885
}

2886 2887
/* main receive path */

2888
static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2889 2890
				struct ieee80211_hdr *hdr)
{
2891
	struct ieee80211_sub_if_data *sdata = rx->sdata;
J
Johannes Berg 已提交
2892 2893 2894
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2895 2896
	int multicast = is_multicast_ether_addr(hdr->addr1);

2897
	switch (sdata->vif.type) {
2898
	case NL80211_IFTYPE_STATION:
2899
		if (!bssid && !sdata->u.mgd.use_4addr)
2900
			return 0;
2901
		if (!multicast &&
2902
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2903 2904
			if (!(sdata->dev->flags & IFF_PROMISC) ||
			    sdata->u.mgd.use_4addr)
2905
				return 0;
2906
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2907 2908
		}
		break;
2909
	case NL80211_IFTYPE_ADHOC:
2910 2911
		if (!bssid)
			return 0;
2912
		if (ieee80211_is_beacon(hdr->frame_control)) {
B
Bruno Randolf 已提交
2913
			return 1;
J
Johannes Berg 已提交
2914 2915
		} else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
			return 0;
2916
		} else if (!multicast &&
2917
			   !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2918
			if (!(sdata->dev->flags & IFF_PROMISC))
2919
				return 0;
2920
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2921 2922
		} else if (!rx->sta) {
			int rate_idx;
2923 2924
			if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
				rate_idx = 0; /* TODO: HT/VHT rates */
2925
			else
J
Johannes Berg 已提交
2926
				rate_idx = status->rate_idx;
2927 2928
			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
						 BIT(rate_idx));
2929
		}
2930
		break;
2931
	case NL80211_IFTYPE_MESH_POINT:
2932
		if (!multicast &&
2933
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2934 2935 2936
			if (!(sdata->dev->flags & IFF_PROMISC))
				return 0;

2937
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2938 2939
		}
		break;
2940 2941
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
2942
		if (!bssid) {
2943
			if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2944
				return 0;
2945
		} else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
2946 2947 2948 2949 2950 2951
			/*
			 * 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.
			 */
J
Johannes Berg 已提交
2952
			if (ieee80211_is_public_action(hdr, skb->len))
2953
				return 1;
J
Johannes Berg 已提交
2954
			if (!ieee80211_is_beacon(hdr->frame_control))
2955
				return 0;
2956
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2957 2958
		}
		break;
2959
	case NL80211_IFTYPE_WDS:
2960
		if (bssid || !ieee80211_is_data(hdr->frame_control))
2961
			return 0;
2962
		if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2963 2964
			return 0;
		break;
2965 2966 2967 2968 2969 2970 2971 2972 2973
	case NL80211_IFTYPE_P2P_DEVICE:
		if (!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))
			return 0;
		if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
		break;
2974
	default:
J
Johannes Berg 已提交
2975
		/* should never get here */
2976
		WARN_ON_ONCE(1);
J
Johannes Berg 已提交
2977
		break;
2978 2979 2980 2981 2982
	}

	return 1;
}

2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
/*
 * 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_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
	int prepares;

	rx->skb = skb;
2999
	status->rx_flags |= IEEE80211_RX_RA_MATCH;
3000 3001 3002 3003 3004 3005 3006 3007 3008 3009
	prepares = prepare_for_handlers(rx, hdr);

	if (!prepares)
		return false;

	if (!consume) {
		skb = skb_copy(skb, GFP_ATOMIC);
		if (!skb) {
			if (net_ratelimit())
				wiphy_debug(local->hw.wiphy,
3010
					"failed to copy skb for %s\n",
3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
					sdata->name);
			return true;
		}

		rx->skb = skb;
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

3022
/*
3023 3024
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
3025
 */
3026
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3027
					 struct sk_buff *skb)
3028 3029 3030 3031
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
Z
Zhu Yi 已提交
3032
	__le16 fc;
3033
	struct ieee80211_rx_data rx;
3034
	struct ieee80211_sub_if_data *prev;
3035
	struct sta_info *sta, *tmp, *prev_sta;
Z
Zhu Yi 已提交
3036
	int err = 0;
3037

Z
Zhu Yi 已提交
3038
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3039 3040 3041
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
3042

Z
Zhu Yi 已提交
3043
	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3044 3045
		local->dot11ReceivedFragmentCount++;

3046 3047 3048 3049 3050 3051 3052
	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 {
Z
Zhu Yi 已提交
3053
		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3054
	}
Z
Zhu Yi 已提交
3055 3056 3057 3058 3059 3060 3061

	if (err) {
		dev_kfree_skb(skb);
		return;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
3062
	ieee80211_parse_qos(&rx);
3063
	ieee80211_verify_alignment(&rx);
3064

J
Johannes Berg 已提交
3065 3066 3067 3068
	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_beacon(hdr->frame_control)))
		ieee80211_scan_rx(local, skb);

Z
Zhu Yi 已提交
3069
	if (ieee80211_is_data(fc)) {
3070
		prev_sta = NULL;
3071

3072
		for_each_sta_info(local, hdr->addr2, sta, tmp) {
3073 3074 3075 3076 3077 3078 3079
			if (!prev_sta) {
				prev_sta = sta;
				continue;
			}

			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;
3080
			ieee80211_prepare_and_rx_handle(&rx, skb, false);
3081

3082
			prev_sta = sta;
3083
		}
3084 3085 3086 3087 3088

		if (prev_sta) {
			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;

3089
			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3090
				return;
3091
			goto out;
3092
		}
3093 3094
	}

3095
	prev = NULL;
3096

3097 3098 3099
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
J
Johannes Berg 已提交
3100

3101 3102 3103
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
J
Johannes Berg 已提交
3104

3105 3106 3107 3108 3109
		/*
		 * 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
		 */
3110

3111
		if (!prev) {
3112
			prev = sdata;
3113
			continue;
J
Johannes Berg 已提交
3114
		}
3115

3116
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3117 3118
		rx.sdata = prev;
		ieee80211_prepare_and_rx_handle(&rx, skb, false);
3119

3120 3121 3122 3123
		prev = sdata;
	}

	if (prev) {
3124
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3125
		rx.sdata = prev;
3126

3127 3128
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
3129
	}
3130

3131
 out:
3132
	dev_kfree_skb(skb);
3133
}
3134 3135 3136 3137 3138

/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
3139
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3140 3141
{
	struct ieee80211_local *local = hw_to_local(hw);
3142 3143
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;
3144
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3145

3146 3147
	WARN_ON_ONCE(softirq_count() == 0);

J
Johannes Berg 已提交
3148
	if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
J
Johannes Berg 已提交
3149
		goto drop;
3150 3151

	sband = local->hw.wiphy->bands[status->band];
J
Johannes Berg 已提交
3152 3153
	if (WARN_ON(!sband))
		goto drop;
3154

J
Johannes Berg 已提交
3155 3156 3157 3158 3159 3160 3161
	/*
	 * 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.
	 */
J
Johannes Berg 已提交
3162 3163
	if (unlikely(local->quiescing || local->suspended))
		goto drop;
J
Johannes Berg 已提交
3164

3165 3166 3167 3168
	/* We might be during a HW reconfig, prevent Rx for the same reason */
	if (unlikely(local->in_reconfig))
		goto drop;

3169 3170 3171 3172
	/*
	 * The same happens when we're not even started,
	 * but that's worth a warning.
	 */
J
Johannes Berg 已提交
3173 3174
	if (WARN_ON(!local->started))
		goto drop;
3175

3176
	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3177
		/*
3178 3179
		 * Validate the rate, unless a PLCP error means that
		 * we probably can't have a valid rate here anyway.
3180
		 */
3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192

		if (status->flag & RX_FLAG_HT) {
			/*
			 * rate_idx is MCS index, which can be [0-76]
			 * as documented on:
			 *
			 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
			 *
			 * Anything else would be some sort of driver or
			 * hardware error. The driver should catch hardware
			 * errors.
			 */
J
Johannes Berg 已提交
3193
			if (WARN(status->rate_idx > 76,
3194 3195 3196 3197 3198 3199
				 "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;
3200 3201 3202 3203 3204 3205 3206
		} else if (status->flag & RX_FLAG_VHT) {
			if (WARN_ONCE(status->rate_idx > 9 ||
				      !status->vht_nss ||
				      status->vht_nss > 8,
				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
				      status->rate_idx, status->vht_nss))
				goto drop;
3207
		} else {
J
Johannes Berg 已提交
3208
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3209 3210 3211
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
3212
	}
3213

3214 3215
	status->rx_flags = 0;

3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228
	/*
	 * key references and virtual interfaces are protected using RCU
	 * and this requires that we are in a read-side RCU section during
	 * receive processing
	 */
	rcu_read_lock();

	/*
	 * Frames with failed FCS/PLCP checksum are not returned,
	 * all other frames are returned without radiotap header
	 * if it was previously present.
	 * Also, frames with less than 16 bytes are dropped.
	 */
3229
	skb = ieee80211_rx_monitor(local, skb, rate);
3230 3231 3232 3233 3234
	if (!skb) {
		rcu_read_unlock();
		return;
	}

3235 3236 3237
	ieee80211_tpt_led_trig_rx(local,
			((struct ieee80211_hdr *)skb->data)->frame_control,
			skb->len);
3238
	__ieee80211_rx_handle_packet(hw, skb);
3239 3240

	rcu_read_unlock();
J
Johannes Berg 已提交
3241 3242 3243 3244

	return;
 drop:
	kfree_skb(skb);
3245
}
3246
EXPORT_SYMBOL(ieee80211_rx);
3247 3248 3249

/* 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 */
3250
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260
{
	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);