rx.c 92.1 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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	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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	/* room for the radiotap header based on driver features */
	needed_headroom = ieee80211_rx_radiotap_space(local, status);

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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,
671 672
					    int index,
					    struct sk_buff_head *frames)
673 674
{
	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(frames, 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,
695 696
					     u16 head_seq_num,
					     struct sk_buff_head *frames)
697 698 699
{
	int index;

700 701
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

702 703 704
	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;
705 706
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
707 708 709 710 711 712 713 714 715
	}
}

/*
 * 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.
716 717
 *
 * Callers must hold tid_agg_rx->reorder_lock.
718 719 720
 */
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)

721
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
722 723
					  struct tid_ampdu_rx *tid_agg_rx,
					  struct sk_buff_head *frames)
724
{
725
	int index, j;
726

727 728
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

729 730 731 732
	/* 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] &&
733
	    tid_agg_rx->stored_mpdu_num) {
734 735 736 737 738 739 740 741 742 743 744
		/*
		 * 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;
			}
745 746
			if (skipped &&
			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
747
					HT_RX_REORDER_BUF_TIMEOUT))
748
				goto set_release_timer;
749

J
Johannes Berg 已提交
750 751
			ht_dbg_ratelimited(sdata,
					   "release an RX reorder frame due to timeout on earlier frames\n");
752 753
			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
							frames);
754 755 756 757 758 759 760 761 762

			/*
			 * 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]) {
763 764
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
765 766 767
		index =	seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
							tid_agg_rx->buf_size;
	}
768 769 770 771 772 773 774 775 776 777 778 779 780 781

	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,
782
			  tid_agg_rx->reorder_time[j] + 1 +
783 784 785 786
			  HT_RX_REORDER_BUF_TIMEOUT);
	} else {
		del_timer(&tid_agg_rx->reorder_timer);
	}
787 788
}

789 790 791 792 793
/*
 * 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.
 */
794
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
795
					     struct tid_ampdu_rx *tid_agg_rx,
796 797
					     struct sk_buff *skb,
					     struct sk_buff_head *frames)
798 799 800 801 802 803
{
	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;
804
	bool ret = true;
805

806 807
	spin_lock(&tid_agg_rx->reorder_lock);

808 809 810 811 812 813
	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);
814
		goto out;
815 816 817 818 819 820 821 822 823
	}

	/*
	 * 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 */
824
		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
825
						 head_seq_num, frames);
826 827 828 829 830 831 832 833 834
	}

	/* 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);
835
		goto out;
836 837 838 839 840
	}

	/*
	 * If the current MPDU is in the right order and nothing else
	 * is stored we can process it directly, no need to buffer it.
841 842
	 * If it is first but there's something stored, we may be able
	 * to release frames after this one.
843 844 845 846
	 */
	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);
847 848
		ret = false;
		goto out;
849 850 851 852 853 854
	}

	/* 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++;
855
	ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
856

857 858 859
 out:
	spin_unlock(&tid_agg_rx->reorder_lock);
	return ret;
860 861 862 863 864 865
}

/*
 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 * true if the MPDU was buffered, false if it should be processed.
 */
866 867
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
				       struct sk_buff_head *frames)
868
{
869 870
	struct sk_buff *skb = rx->skb;
	struct ieee80211_local *local = rx->local;
871
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
872
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
873
	struct sta_info *sta = rx->sta;
874 875
	struct tid_ampdu_rx *tid_agg_rx;
	u16 sc;
876
	u8 tid, ack_policy;
877 878

	if (!ieee80211_is_data_qos(hdr->frame_control))
879
		goto dont_reorder;
880 881 882 883 884 885 886

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

	if (!sta)
887
		goto dont_reorder;
888

889 890
	ack_policy = *ieee80211_get_qos_ctl(hdr) &
		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
891 892
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;

893 894 895
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		goto dont_reorder;
896 897 898

	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
899
		goto dont_reorder;
900

901 902 903 904 905
	/* 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;

906 907 908 909
	/* not actually part of this BA session */
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
		goto dont_reorder;

910 911 912 913
	/* new, potentially un-ordered, ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout)
914
		tid_agg_rx->last_rx = jiffies;
915 916 917 918

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
919
		skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
920 921
		skb_queue_tail(&rx->sdata->skb_queue, skb);
		ieee80211_queue_work(&local->hw, &rx->sdata->work);
922
		return;
923 924
	}

925 926 927 928 929 930 931
	/*
	 * 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.
	 */
932 933
	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
					     frames))
934 935 936
		return;

 dont_reorder:
937
	__skb_queue_tail(frames, skb);
938
}
939

940
static ieee80211_rx_result debug_noinline
941
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
942
{
943
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
944
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
945 946 947

	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
	if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
948
		if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
949
			     rx->sta->last_seq_ctrl[rx->seqno_idx] ==
950
			     hdr->seq_ctrl)) {
951
			if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
952 953 954
				rx->local->dot11FrameDuplicateCount++;
				rx->sta->num_duplicates++;
			}
955
			return RX_DROP_UNUSABLE;
956
		} else
957
			rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
958 959 960 961
	}

	if (unlikely(rx->skb->len < 16)) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
J
Johannes Berg 已提交
962
		return RX_DROP_MONITOR;
963 964 965 966 967
	}

	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
J
Johannes Berg 已提交
968 969
	 * mac80211 filters only based on association state, i.e. it drops
	 * Class 3 frames from not associated stations. hostapd sends
970 971 972
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
973

J
Johannes Berg 已提交
974
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
975 976
		return ieee80211_rx_mesh_check(rx);

977 978
	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
979
		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
B
Bill Jordan 已提交
980
		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
J
Johannes Berg 已提交
981
		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
982 983 984 985 986 987
		/*
		 * 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 &&
988
		    ieee80211_is_data_present(hdr->frame_control)) {
989 990 991 992 993 994 995 996 997 998
			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)
999 1000
				return RX_CONTINUE;
		}
1001 1002 1003 1004 1005 1006 1007

		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
1008
		return RX_DROP_MONITOR;
1009
	}
1010

1011
	return RX_CONTINUE;
1012 1013 1014
}


1015
static ieee80211_rx_result debug_noinline
1016
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1017
{
J
Johannes Berg 已提交
1018 1019 1020
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1021 1022
	int keyidx;
	int hdrlen;
J
Johannes Berg 已提交
1023
	ieee80211_rx_result result = RX_DROP_UNUSABLE;
1024
	struct ieee80211_key *sta_ptk = NULL;
1025
	int mmie_keyidx = -1;
J
Johannes Berg 已提交
1026
	__le16 fc;
1027

1028 1029 1030
	/*
	 * Key selection 101
	 *
1031
	 * There are four types of keys:
1032
	 *  - GTK (group keys)
1033
	 *  - IGTK (group keys for management frames)
1034 1035 1036 1037 1038
	 *  - 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
1039 1040 1041 1042
	 * 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.
1043
	 *
1044 1045 1046 1047
	 * 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.
	 *
1048 1049
	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
1050 1051 1052
	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
1053 1054 1055
	 */

	/*
1056
	 * No point in finding a key and decrypting if the frame is neither
1057 1058
	 * addressed to us nor a multicast frame.
	 */
1059
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1060
		return RX_CONTINUE;
1061

1062 1063 1064
	/* start without a key */
	rx->key = NULL;

1065
	if (rx->sta)
1066
		sta_ptk = rcu_dereference(rx->sta->ptk);
1067

J
Johannes Berg 已提交
1068 1069 1070
	fc = hdr->frame_control;

	if (!ieee80211_has_protected(fc))
1071 1072
		mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);

1073 1074
	if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
		rx->key = sta_ptk;
1075 1076 1077
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;
1078
		/* Skip decryption if the frame is not protected. */
J
Johannes Berg 已提交
1079
		if (!ieee80211_has_protected(fc))
1080
			return RX_CONTINUE;
1081 1082
	} else if (mmie_keyidx >= 0) {
		/* Broadcast/multicast robust management frame / BIP */
J
Johannes Berg 已提交
1083 1084
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
1085 1086 1087 1088 1089
			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 */
1090 1091 1092 1093
		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
1094
	} else if (!ieee80211_has_protected(fc)) {
1095 1096 1097 1098 1099 1100 1101
		/*
		 * 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;
J
Johannes Berg 已提交
1102 1103 1104
		struct ieee80211_sub_if_data *sdata = rx->sdata;
		int i;

J
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1105
		if (ieee80211_is_mgmt(fc) &&
1106 1107 1108
		    is_multicast_ether_addr(hdr->addr1) &&
		    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
			rx->key = key;
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1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
		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;
		}
1127
		return RX_CONTINUE;
1128
	} else {
1129
		u8 keyid;
1130 1131 1132 1133 1134 1135 1136 1137 1138
		/*
		 * 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?
		 */
J
Johannes Berg 已提交
1139 1140
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
1141
			return RX_CONTINUE;
1142

J
Johannes Berg 已提交
1143
		hdrlen = ieee80211_hdrlen(fc);
1144 1145

		if (rx->skb->len < 8 + hdrlen)
J
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1146
			return RX_DROP_UNUSABLE; /* TODO: count this? */
1147 1148 1149 1150 1151

		/*
		 * no need to call ieee80211_wep_get_keyidx,
		 * it verifies a bunch of things we've done already
		 */
1152 1153
		skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
		keyidx = keyid >> 6;
1154

1155 1156 1157
		/* 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]);
1158

1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
		/* 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;
		}
1174 1175
	}

1176
	if (rx->key) {
1177 1178 1179
		if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
			return RX_DROP_MONITOR;

1180
		rx->key->tx_rx_count++;
1181
		/* TODO: add threshold stuff again */
1182
	} else {
J
Johannes Berg 已提交
1183
		return RX_DROP_MONITOR;
1184 1185
	}

1186 1187 1188
	switch (rx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1189 1190
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
1191
	case WLAN_CIPHER_SUITE_TKIP:
1192 1193
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
1194
	case WLAN_CIPHER_SUITE_CCMP:
1195 1196
		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
1197
	case WLAN_CIPHER_SUITE_AES_CMAC:
1198 1199
		result = ieee80211_crypto_aes_cmac_decrypt(rx);
		break;
1200 1201 1202 1203 1204 1205
	default:
		/*
		 * We can reach here only with HW-only algorithms
		 * but why didn't it decrypt the frame?!
		 */
		return RX_DROP_UNUSABLE;
1206 1207
	}

1208 1209
	/* the hdr variable is invalid after the decrypt handlers */

1210
	/* either the frame has been decrypted or will be dropped */
J
Johannes Berg 已提交
1211
	status->flag |= RX_FLAG_DECRYPTED;
1212 1213

	return result;
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 1241 1242 1243 1244 1245 1246 1247 1248
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;
}

1249
static void sta_ps_start(struct sta_info *sta)
1250
{
1251
	struct ieee80211_sub_if_data *sdata = sta->sdata;
1252
	struct ieee80211_local *local = sdata->local;
1253
	struct ps_data *ps;
1254

1255 1256 1257 1258 1259 1260 1261
	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);
J
Johannes Berg 已提交
1262
	set_sta_flag(sta, WLAN_STA_PS_STA);
1263 1264
	if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
J
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1265 1266
	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1267 1268
}

1269
static void sta_ps_end(struct sta_info *sta)
1270
{
J
Johannes Berg 已提交
1271 1272
	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1273

J
Johannes Berg 已提交
1274
	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
J
Johannes Berg 已提交
1275 1276
		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
		       sta->sta.addr, sta->sta.aid);
1277 1278 1279 1280
		return;
	}

	ieee80211_sta_ps_deliver_wakeup(sta);
1281 1282
}

1283 1284 1285 1286 1287 1288 1289 1290
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 */
J
Johannes Berg 已提交
1291
	in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1292 1293 1294 1295
	if ((start && in_ps) || (!start && !in_ps))
		return -EINVAL;

	if (start)
1296
		sta_ps_start(sta_inf);
1297
	else
1298
		sta_ps_end(sta_inf);
1299 1300 1301 1302 1303

	return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);

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1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
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 ...
	 */
J
Johannes Berg 已提交
1332
	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
J
Johannes Berg 已提交
1333 1334 1335
		return RX_CONTINUE;

	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
J
Johannes Berg 已提交
1336 1337
		if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
			if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1338 1339
				ieee80211_sta_ps_deliver_poll_response(rx->sta);
			else
J
Johannes Berg 已提交
1340
				set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1341
		}
J
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1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366

		/* 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 */
J
Johannes Berg 已提交
1367
		if (test_sta_flag(rx->sta, WLAN_STA_SP))
J
Johannes Berg 已提交
1368 1369
			return RX_CONTINUE;

J
Johannes Berg 已提交
1370
		if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
J
Johannes Berg 已提交
1371 1372
			ieee80211_sta_ps_deliver_uapsd(rx->sta);
		else
J
Johannes Berg 已提交
1373
			set_sta_flag(rx->sta, WLAN_STA_UAPSD);
J
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1374 1375 1376 1377 1378
	}

	return RX_CONTINUE;
}

1379
static ieee80211_rx_result debug_noinline
1380
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1381 1382
{
	struct sta_info *sta = rx->sta;
J
Johannes Berg 已提交
1383 1384 1385
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1386 1387

	if (!sta)
1388
		return RX_CONTINUE;
1389

J
Johannes Berg 已提交
1390 1391
	/*
	 * Update last_rx only for IBSS packets which are for the current
1392 1393 1394 1395 1396
	 * 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
1397
	 */
1398
	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1399
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1400
						NL80211_IFTYPE_ADHOC);
1401 1402
		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1403
			sta->last_rx = jiffies;
1404 1405 1406
			if (ieee80211_is_data(hdr->frame_control)) {
				sta->last_rx_rate_idx = status->rate_idx;
				sta->last_rx_rate_flag = status->flag;
1407
				sta->last_rx_rate_vht_nss = status->vht_nss;
1408 1409
			}
		}
J
Johannes Berg 已提交
1410 1411
	} else if (!is_multicast_ether_addr(hdr->addr1)) {
		/*
1412 1413
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
1414
		 */
J
Johannes Berg 已提交
1415
		sta->last_rx = jiffies;
1416 1417 1418
		if (ieee80211_is_data(hdr->frame_control)) {
			sta->last_rx_rate_idx = status->rate_idx;
			sta->last_rx_rate_flag = status->flag;
1419
			sta->last_rx_rate_vht_nss = status->vht_nss;
1420
		}
1421 1422
	}

1423
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1424
		return RX_CONTINUE;
1425

1426 1427 1428
	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
		ieee80211_sta_rx_notify(rx->sdata, hdr);

1429 1430
	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
1431 1432 1433 1434
	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
		sta->last_signal = status->signal;
		ewma_add(&sta->avg_signal, -status->signal);
	}
1435

1436 1437 1438 1439
	/*
	 * Change STA power saving mode only at the end of a frame
	 * exchange sequence.
	 */
1440 1441
	if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
	    !ieee80211_has_morefrags(hdr->frame_control) &&
1442
	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1443 1444
	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
J
Johannes Berg 已提交
1445
		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
			/*
			 * 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))
1456
				sta_ps_end(sta);
1457 1458
		} else {
			if (ieee80211_has_pm(hdr->frame_control))
1459
				sta_ps_start(sta);
1460
		}
1461 1462
	}

M
Marco Porsch 已提交
1463 1464 1465 1466
	/* mesh power save support */
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
		ieee80211_mps_rx_h_sta_process(sta, hdr);

1467 1468 1469 1470 1471 1472
	/*
	 * 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)) {
1473
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1474 1475 1476

		/*
		 * If we receive a 4-addr nullfunc frame from a STA
1477 1478 1479
		 * 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.
1480 1481 1482 1483
		 */
		if (ieee80211_has_a4(hdr->frame_control) &&
		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1484 1485 1486 1487 1488
		      !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);
1489
			return RX_DROP_MONITOR;
1490
		}
1491 1492 1493 1494
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
1495 1496
		sta->rx_packets++;
		dev_kfree_skb(rx->skb);
1497
		return RX_QUEUED;
1498 1499
	}

1500
	return RX_CONTINUE;
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
} /* 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;

J
Johannes Berg 已提交
1514
	if (!skb_queue_empty(&entry->skb_list))
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
		__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,
1531
			  unsigned int frag, unsigned int seq,
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
			  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;

1551
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1552

1553 1554 1555 1556 1557
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1558 1559
		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1560 1561
			continue;

1562
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1563 1564 1565 1566 1567 1568 1569 1570 1571
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

1572
static ieee80211_rx_result debug_noinline
1573
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1574 1575 1576
{
	struct ieee80211_hdr *hdr;
	u16 sc;
1577
	__le16 fc;
1578 1579 1580
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
1581
	struct ieee80211_rx_status *status;
1582

1583
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1584
	fc = hdr->frame_control;
1585 1586 1587 1588

	if (ieee80211_is_ctl(fc))
		return RX_CONTINUE;

1589 1590 1591
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

1592
	if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1593 1594 1595 1596 1597 1598
		   is_multicast_ether_addr(hdr->addr1))) {
		/* not fragmented */
		goto out;
	}
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

Z
Zhu Yi 已提交
1599 1600 1601
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;

1602 1603 1604 1605 1606 1607
	/*
	 *  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;
1608 1609 1610 1611 1612
	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,
1613
						 rx->seqno_idx, &(rx->skb));
1614
		if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1615
		    ieee80211_has_protected(fc)) {
1616
			int queue = rx->security_idx;
1617 1618 1619 1620
			/* Store CCMP PN so that we can verify that the next
			 * fragment has a sequential PN value. */
			entry->ccmp = 1;
			memcpy(entry->last_pn,
1621
			       rx->key->u.ccmp.rx_pn[queue],
1622 1623
			       CCMP_PN_LEN);
		}
1624
		return RX_QUEUED;
1625 1626 1627 1628 1629
	}

	/* 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.
	 */
1630 1631
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
					  rx->seqno_idx, hdr);
1632 1633
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
1634
		return RX_DROP_MONITOR;
1635 1636 1637 1638 1639 1640 1641
	}

	/* 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;
1642
		int queue;
1643
		if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
J
Johannes Berg 已提交
1644
			return RX_DROP_UNUSABLE;
1645 1646 1647 1648 1649 1650
		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
1651
		queue = rx->security_idx;
1652
		rpn = rx->key->u.ccmp.rx_pn[queue];
1653
		if (memcmp(pn, rpn, CCMP_PN_LEN))
J
Johannes Berg 已提交
1654
			return RX_DROP_UNUSABLE;
1655 1656 1657
		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
	}

1658
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
1659 1660 1661
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
1662
	if (ieee80211_has_morefrags(fc)) {
1663
		rx->skb = NULL;
1664
		return RX_QUEUED;
1665 1666 1667 1668 1669 1670 1671 1672 1673
	}

	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
1674
			return RX_DROP_UNUSABLE;
1675 1676 1677 1678 1679 1680 1681 1682
		}
	}
	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 */
1683 1684
	status = IEEE80211_SKB_RXCB(rx->skb);
	status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1685 1686 1687 1688 1689 1690 1691 1692

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
1693
	return RX_CONTINUE;
1694 1695
}

J
Johannes Berg 已提交
1696
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1697
{
J
Johannes Berg 已提交
1698
	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1699
		return -EACCES;
1700

1701
	return 0;
1702 1703
}

J
Johannes Berg 已提交
1704
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1705
{
J
Johannes Berg 已提交
1706 1707 1708
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

1709
	/*
1710 1711
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1712
	 */
J
Johannes Berg 已提交
1713
	if (status->flag & RX_FLAG_DECRYPTED)
1714
		return 0;
1715 1716

	/* Drop unencrypted frames if key is set. */
1717 1718
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
1719
		     ieee80211_is_data(fc) &&
1720
		     (rx->key || rx->sdata->drop_unencrypted)))
1721
		return -EACCES;
1722 1723 1724 1725

	return 0;
}

J
Johannes Berg 已提交
1726
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1727 1728
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1729
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1730 1731
	__le16 fc = hdr->frame_control;

1732 1733 1734 1735 1736 1737
	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return 0;
1738

J
Johannes Berg 已提交
1739
	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1740 1741
		if (unlikely(!ieee80211_has_protected(fc) &&
			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1742 1743 1744 1745 1746 1747 1748 1749 1750
			     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);
1751
			return -EACCES;
1752
		}
1753
		/* BIP does not use Protected field, so need to check MMIE */
1754
		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1755 1756 1757 1758 1759 1760 1761 1762 1763
			     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);
1764
			return -EACCES;
1765
		}
1766 1767 1768 1769 1770 1771 1772 1773 1774
		/*
		 * 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;
	}
1775

1776
	return 0;
1777 1778
}

1779
static int
1780
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1781
{
J
Johannes Berg 已提交
1782
	struct ieee80211_sub_if_data *sdata = rx->sdata;
1783
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1784 1785 1786
	bool check_port_control = false;
	struct ethhdr *ehdr;
	int ret;
1787

1788
	*port_control = false;
1789 1790
	if (ieee80211_has_a4(hdr->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1791
		return -1;
1792

1793 1794 1795 1796 1797 1798 1799 1800 1801
	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;
	}

1802
	if (is_multicast_ether_addr(hdr->addr1) &&
1803
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1804
		return -1;
1805

1806
	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1807
	if (ret < 0)
1808 1809 1810
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
1811 1812 1813
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
1814 1815 1816
		return -1;

	return 0;
1817
}
1818

1819 1820 1821
/*
 * requires that rx->skb is a frame with ethernet header
 */
1822
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1823
{
1824
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1825 1826 1827 1828 1829 1830 1831
		= { 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.
	 */
1832
	if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1833 1834
	    (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
	     ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1835 1836 1837
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
1838
	    ieee80211_drop_unencrypted(rx, fc))
1839 1840 1841 1842 1843 1844 1845 1846
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
1847
static void
1848
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1849
{
J
Johannes Berg 已提交
1850 1851
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct net_device *dev = sdata->dev;
1852
	struct sk_buff *skb, *xmit_skb;
1853 1854
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1855
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1856

1857 1858
	skb = rx->skb;
	xmit_skb = NULL;
1859

1860 1861
	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1862
	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1863
	    (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1864
	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1865 1866 1867 1868 1869
		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
			 */
1870
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
1871
			if (!xmit_skb)
J
Johannes Berg 已提交
1872
				net_info_ratelimited("%s: failed to clone multicast frame\n",
1873
						    dev->name);
1874
		} else {
1875 1876
			dsta = sta_info_get(sdata, skb->data);
			if (dsta) {
1877 1878 1879 1880 1881
				/*
				 * 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.
1882
				 */
1883
				xmit_skb = skb;
1884 1885 1886 1887 1888 1889
				skb = NULL;
			}
		}
	}

	if (skb) {
1890 1891
		int align __maybe_unused;

1892
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1893 1894 1895 1896 1897 1898 1899
		/*
		 * '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.
		 */
1900
		align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1901 1902 1903 1904 1905 1906
		if (align) {
			if (WARN_ON(skb_headroom(skb) < 3)) {
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				u8 *data = skb->data;
1907 1908 1909 1910
				size_t len = skb_headlen(skb);
				skb->data -= align;
				memmove(skb->data, data, len);
				skb_set_tail_pointer(skb, len);
1911 1912 1913 1914 1915 1916 1917 1918
			}
		}
#endif

		if (skb) {
			/* deliver to local stack */
			skb->protocol = eth_type_trans(skb, dev);
			memset(skb->cb, 0, sizeof(skb->cb));
1919
			netif_receive_skb(skb);
1920
		}
1921 1922
	}

1923
	if (xmit_skb) {
1924 1925 1926 1927 1928 1929
		/*
		 * 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;
1930
		xmit_skb->protocol = htons(ETH_P_802_3);
1931 1932
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1933
		dev_queue_xmit(xmit_skb);
1934
	}
1935 1936
}

1937
static ieee80211_rx_result debug_noinline
1938
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1939
{
J
Johannes Berg 已提交
1940
	struct net_device *dev = rx->sdata->dev;
Z
Zhu Yi 已提交
1941
	struct sk_buff *skb = rx->skb;
1942 1943
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
Z
Zhu Yi 已提交
1944
	struct sk_buff_head frame_list;
1945
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1946

1947
	if (unlikely(!ieee80211_is_data(fc)))
1948
		return RX_CONTINUE;
1949

1950
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
1951
		return RX_DROP_MONITOR;
1952

1953
	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1954
		return RX_CONTINUE;
1955

Z
Zhu Yi 已提交
1956 1957 1958
	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
1959
		return RX_DROP_UNUSABLE;
1960

Z
Zhu Yi 已提交
1961 1962 1963 1964 1965
	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
1966
		return RX_DROP_UNUSABLE;
1967

Z
Zhu Yi 已提交
1968 1969
	skb->dev = dev;
	__skb_queue_head_init(&frame_list);
1970

Z
Zhu Yi 已提交
1971 1972 1973
	if (skb_linearize(skb))
		return RX_DROP_UNUSABLE;

Z
Zhu Yi 已提交
1974 1975
	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
1976
				 rx->local->hw.extra_tx_headroom, true);
1977

Z
Zhu Yi 已提交
1978 1979
	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);
1980

1981
		if (!ieee80211_frame_allowed(rx, fc)) {
Z
Zhu Yi 已提交
1982
			dev_kfree_skb(rx->skb);
1983 1984
			continue;
		}
Z
Zhu Yi 已提交
1985 1986
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += rx->skb->len;
1987 1988 1989 1990

		ieee80211_deliver_skb(rx);
	}

1991
	return RX_QUEUED;
1992 1993
}

I
Ingo Molnar 已提交
1994
#ifdef CONFIG_MAC80211_MESH
1995
static ieee80211_rx_result
1996 1997
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
1998 1999
	struct ieee80211_hdr *fwd_hdr, *hdr;
	struct ieee80211_tx_info *info;
2000 2001
	struct ieee80211s_hdr *mesh_hdr;
	struct sk_buff *skb = rx->skb, *fwd_skb;
J
Johannes Berg 已提交
2002
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2003
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2004
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2005
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2006
	__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2007
	u16 q, hdrlen;
2008 2009 2010

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

	/* 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;
2025 2026
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

2027 2028 2029
	/* frame is in RMC, don't forward */
	if (ieee80211_is_data(hdr->frame_control) &&
	    is_multicast_ether_addr(hdr->addr1) &&
J
Johannes Berg 已提交
2030
	    mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2031 2032
		return RX_DROP_MONITOR;

2033 2034
	if (!ieee80211_is_data(hdr->frame_control) ||
	    !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2035 2036 2037 2038 2039
		return RX_CONTINUE;

	if (!mesh_hdr->ttl)
		return RX_DROP_MONITOR;

2040
	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2041
		struct mesh_path *mppath;
2042 2043 2044 2045 2046 2047
		char *proxied_addr;
		char *mpp_addr;

		if (is_multicast_ether_addr(hdr->addr1)) {
			mpp_addr = hdr->addr3;
			proxied_addr = mesh_hdr->eaddr1;
2048 2049
		} else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
			/* has_a4 already checked in ieee80211_rx_mesh_check */
2050 2051
			mpp_addr = hdr->addr4;
			proxied_addr = mesh_hdr->eaddr2;
2052 2053
		} else {
			return RX_DROP_MONITOR;
2054
		}
2055 2056

		rcu_read_lock();
J
Johannes Berg 已提交
2057
		mppath = mpp_path_lookup(sdata, proxied_addr);
2058
		if (!mppath) {
J
Johannes Berg 已提交
2059
			mpp_path_add(sdata, proxied_addr, mpp_addr);
2060 2061
		} else {
			spin_lock_bh(&mppath->state_lock);
2062
			if (!ether_addr_equal(mppath->mpp, mpp_addr))
2063
				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2064 2065 2066 2067 2068
			spin_unlock_bh(&mppath->state_lock);
		}
		rcu_read_unlock();
	}

2069 2070
	/* Frame has reached destination.  Don't forward */
	if (!is_multicast_ether_addr(hdr->addr1) &&
2071
	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
2072 2073
		return RX_CONTINUE;

Y
Yoni Divinsky 已提交
2074
	q = ieee80211_select_queue_80211(sdata, skb, hdr);
2075
	if (ieee80211_queue_stopped(&local->hw, q)) {
2076
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2077 2078 2079
		return RX_DROP_MONITOR;
	}
	skb_set_queue_mapping(skb, q);
2080

2081 2082
	if (!--mesh_hdr->ttl) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2083
		goto out;
2084 2085
	}

2086 2087 2088
	if (!ifmsh->mshcfg.dot11MeshForwarding)
		goto out;

2089 2090
	fwd_skb = skb_copy(skb, GFP_ATOMIC);
	if (!fwd_skb) {
J
Johannes Berg 已提交
2091
		net_info_ratelimited("%s: failed to clone mesh frame\n",
2092
				    sdata->name);
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
		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);
M
Marco Porsch 已提交
2105 2106
		/* update power mode indication when forwarding */
		ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
J
Johannes Berg 已提交
2107
	} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
M
Marco Porsch 已提交
2108
		/* mesh power mode flags updated in mesh_nexthop_lookup */
2109 2110 2111
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	} else {
		/* unable to resolve next hop */
J
Johannes Berg 已提交
2112 2113
		mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
				   fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2114
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2115
		kfree_skb(fwd_skb);
2116
		return RX_DROP_MONITOR;
2117 2118
	}

2119 2120
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_add_pending_skb(local, fwd_skb);
J
Johannes Berg 已提交
2121
 out:
2122
	if (is_multicast_ether_addr(hdr->addr1) ||
J
Johannes Berg 已提交
2123
	    sdata->dev->flags & IFF_PROMISC)
2124 2125 2126 2127
		return RX_CONTINUE;
	else
		return RX_DROP_MONITOR;
}
I
Ingo Molnar 已提交
2128
#endif
2129

2130
static ieee80211_rx_result debug_noinline
2131
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2132
{
J
Johannes Berg 已提交
2133
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2134
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2135
	struct net_device *dev = sdata->dev;
2136 2137
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
2138
	bool port_control;
2139
	int err;
2140

2141
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2142
		return RX_CONTINUE;
2143

2144
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
2145
		return RX_DROP_MONITOR;
2146

2147
	/*
2148 2149
	 * Send unexpected-4addr-frame event to hostapd. For older versions,
	 * also drop the frame to cooked monitor interfaces.
2150 2151
	 */
	if (ieee80211_has_a4(hdr->frame_control) &&
2152 2153 2154 2155 2156
	    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);
2157
		return RX_DROP_MONITOR;
2158
	}
2159

2160
	err = __ieee80211_data_to_8023(rx, &port_control);
2161
	if (unlikely(err))
J
Johannes Berg 已提交
2162
		return RX_DROP_UNUSABLE;
2163

2164
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
2165
		return RX_DROP_MONITOR;
2166

2167 2168 2169 2170 2171 2172 2173 2174
	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;
	}

2175 2176 2177 2178 2179
	rx->skb->dev = dev;

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

2180
	if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2181 2182 2183 2184
	    !is_multicast_ether_addr(
		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
	    (!local->scanning &&
	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2185 2186 2187 2188
			mod_timer(&local->dynamic_ps_timer, jiffies +
			 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
	}

2189
	ieee80211_deliver_skb(rx);
2190

2191
	return RX_QUEUED;
2192 2193
}

2194
static ieee80211_rx_result debug_noinline
2195
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2196 2197
{
	struct sk_buff *skb = rx->skb;
2198
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2199 2200 2201 2202
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

2203
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
2204
		return RX_CONTINUE;
2205

2206
	if (ieee80211_is_back_req(bar->frame_control)) {
2207 2208 2209 2210
		struct {
			__le16 control, start_seq_num;
		} __packed bar_data;

2211
		if (!rx->sta)
2212
			return RX_DROP_MONITOR;
2213 2214 2215 2216 2217 2218

		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;
2219 2220 2221

		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
2222
			return RX_DROP_MONITOR;
2223

2224
		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2225 2226

		/* reset session timer */
2227 2228 2229
		if (tid_agg_rx->timeout)
			mod_timer(&tid_agg_rx->session_timer,
				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2230

2231
		spin_lock(&tid_agg_rx->reorder_lock);
2232
		/* release stored frames up to start of BAR */
2233
		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2234
						 start_seq_num, frames);
2235 2236
		spin_unlock(&tid_agg_rx->reorder_lock);

2237 2238
		kfree_skb(skb);
		return RX_QUEUED;
2239 2240
	}

2241 2242 2243 2244 2245 2246
	/*
	 * After this point, we only want management frames,
	 * so we can drop all remaining control frames to
	 * cooked monitor interfaces.
	 */
	return RX_DROP_MONITOR;
2247 2248
}

2249 2250 2251
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_mgmt *mgmt,
					   size_t len)
2252 2253 2254 2255 2256
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;

2257
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2258 2259 2260 2261
		/* Not to own unicast address */
		return;
	}

2262 2263
	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2264
		/* Not from the current AP or not associated yet. */
2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280
		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);
2281
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2282
	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2283 2284 2285 2286 2287 2288 2289 2290 2291
	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);

2292
	ieee80211_tx_skb(sdata, skb);
2293 2294
}

2295 2296 2297 2298
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;
2299
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311

	/*
	 * 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
2312 2313 2314
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2315 2316 2317 2318 2319
		int sig = 0;

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

J
Johannes Berg 已提交
2320 2321
		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
					    rx->skb->data, rx->skb->len,
2322
					    status->freq, sig);
J
Johannes Berg 已提交
2323 2324 2325
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

2326
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2327 2328 2329 2330 2331 2332 2333 2334
		return RX_DROP_MONITOR;

	if (ieee80211_drop_unencrypted_mgmt(rx))
		return RX_DROP_UNUSABLE;

	return RX_CONTINUE;
}

2335 2336 2337 2338
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
2339
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2340
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2341
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2342 2343 2344 2345 2346
	int len = rx->skb->len;

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

2347 2348
	/* drop too small frames */
	if (len < IEEE80211_MIN_ACTION_SIZE)
2349
		return RX_DROP_UNUSABLE;
2350

2351 2352
	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
	    mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2353
		return RX_DROP_UNUSABLE;
2354

2355
	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2356
		return RX_DROP_UNUSABLE;
2357

2358
	switch (mgmt->u.action.category) {
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370
	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;

2371
		/* verify action & smps_control/chanwidth are present */
2372 2373 2374 2375 2376 2377
		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;
2378
			enum ieee80211_smps_mode smps_mode;
2379 2380 2381 2382

			/* convert to HT capability */
			switch (mgmt->u.action.u.ht_smps.smps_control) {
			case WLAN_HT_SMPS_CONTROL_DISABLED:
2383
				smps_mode = IEEE80211_SMPS_OFF;
2384 2385
				break;
			case WLAN_HT_SMPS_CONTROL_STATIC:
2386
				smps_mode = IEEE80211_SMPS_STATIC;
2387 2388
				break;
			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2389
				smps_mode = IEEE80211_SMPS_DYNAMIC;
2390 2391 2392 2393 2394 2395
				break;
			default:
				goto invalid;
			}

			/* if no change do nothing */
2396
			if (rx->sta->sta.smps_mode == smps_mode)
2397
				goto handled;
2398
			rx->sta->sta.smps_mode = smps_mode;
2399 2400 2401

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

2402 2403
			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_SMPS_CHANGED);
2404 2405
			goto handled;
		}
2406 2407 2408
		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
			struct ieee80211_supported_band *sband;
			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2409
			enum ieee80211_sta_rx_bandwidth new_bw;
2410 2411

			/* If it doesn't support 40 MHz it can't change ... */
2412 2413
			if (!(rx->sta->sta.ht_cap.cap &
					IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2414 2415
				goto handled;

2416 2417 2418 2419
			if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
				new_bw = IEEE80211_STA_RX_BW_20;
			else
				new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2420

2421
			if (rx->sta->sta.bandwidth == new_bw)
2422 2423 2424 2425 2426 2427 2428 2429
				goto handled;

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

			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_BW_CHANGED);
			goto handled;
		}
2430 2431 2432 2433
		default:
			goto invalid;
		}

2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
		break;
	case WLAN_CATEGORY_VHT:
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

		/* verify action code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			goto invalid;

		switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
			u8 opmode;

			/* verify opmode is present */
			if (len < IEEE80211_MIN_ACTION_SIZE + 2)
				goto invalid;

			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;

			ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2458 2459
						    opmode, status->band,
						    false);
2460 2461 2462 2463 2464
			goto handled;
		}
		default:
			break;
		}
2465
		break;
2466
	case WLAN_CATEGORY_BACK:
2467
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2468
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2469
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2470 2471
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2472
			break;
2473

2474 2475 2476 2477
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2478 2479 2480 2481
		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)))
2482 2483
				goto invalid;
			break;
2484 2485 2486
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
2487 2488
				goto invalid;
			break;
2489 2490 2491
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
2492 2493 2494 2495
				goto invalid;
			break;
		default:
			goto invalid;
2496
		}
2497

2498
		goto queue;
2499
	case WLAN_CATEGORY_SPECTRUM_MGMT:
2500
		if (status->band != IEEE80211_BAND_5GHZ)
2501
			break;
2502 2503

		if (sdata->vif.type != NL80211_IFTYPE_STATION)
2504
			break;
2505

2506 2507 2508 2509
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2510 2511 2512 2513
		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)))
2514
				break;
2515
			ieee80211_process_measurement_req(sdata, mgmt, len);
2516
			goto handled;
S
Sujith 已提交
2517 2518 2519
		case WLAN_ACTION_SPCT_CHL_SWITCH:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.chan_switch)))
2520
				break;
S
Sujith 已提交
2521

2522
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2523
				break;
2524

2525
			if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2526
				break;
S
Sujith 已提交
2527

2528
			goto queue;
2529 2530
		}
		break;
2531 2532 2533
	case WLAN_CATEGORY_SA_QUERY:
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.sa_query)))
2534 2535
			break;

2536 2537 2538
		switch (mgmt->u.action.u.sa_query.action) {
		case WLAN_ACTION_SA_QUERY_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2539
				break;
2540
			ieee80211_process_sa_query_req(sdata, mgmt, len);
2541
			goto handled;
2542 2543
		}
		break;
2544
	case WLAN_CATEGORY_SELF_PROTECTED:
2545 2546 2547 2548
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.self_prot.action_code)))
			break;

2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
		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;
2566
	case WLAN_CATEGORY_MESH_ACTION:
2567 2568 2569 2570
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
			break;

2571 2572
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
2573
		if (mesh_action_is_path_sel(mgmt) &&
J
Johannes Berg 已提交
2574
		    !mesh_path_sel_is_hwmp(sdata))
2575 2576
			break;
		goto queue;
2577
	}
2578

2579 2580
	return RX_CONTINUE;

2581
 invalid:
2582
	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
	/* 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)
{
2604
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2605
	int sig = 0;
2606 2607

	/* skip known-bad action frames and return them in the next handler */
2608
	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2609
		return RX_CONTINUE;
2610

2611 2612 2613 2614 2615 2616 2617
	/*
	 * 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.
	 */

2618 2619 2620
	if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
		sig = status->signal;

2621
	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
			     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;
2640
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2641 2642 2643 2644 2645 2646 2647 2648 2649

	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
2650
	 * 802.11-2012 9.24.4.
2651 2652 2653 2654
	 * 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.
	 */
2655
	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2656 2657 2658
	    (sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
		return RX_DROP_MONITOR;
2659

2660 2661 2662
	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_MONITOR;

2663 2664 2665 2666 2667 2668 2669
	/* 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) {
2670
		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2671

2672 2673 2674
		nmgmt->u.action.category |= 0x80;
		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2675 2676 2677 2678

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

		ieee80211_tx_skb(rx->sdata, nskb);
2679
	}
2680 2681
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
2682 2683
}

2684
static ieee80211_rx_result debug_noinline
2685
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2686
{
J
Johannes Berg 已提交
2687
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2688 2689
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 stype;
2690

2691
	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2692

2693 2694 2695 2696
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
	    sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_MONITOR;
2697

2698
	switch (stype) {
J
Johannes Berg 已提交
2699
	case cpu_to_le16(IEEE80211_STYPE_AUTH):
2700 2701 2702 2703
	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
2704 2705
	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2706 2707
	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2708 2709 2710 2711
		if (is_multicast_ether_addr(mgmt->da) &&
		    !is_broadcast_ether_addr(mgmt->da))
			return RX_DROP_MONITOR;

2712 2713 2714 2715 2716
		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_MONITOR;
		break;
	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2717 2718 2719
		/* process only for ibss and mesh */
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2720 2721 2722 2723 2724
			return RX_DROP_MONITOR;
		break;
	default:
		return RX_DROP_MONITOR;
	}
2725

2726
	/* queue up frame and kick off work to process it */
2727
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2728 2729
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&rx->local->hw, &sdata->work);
2730 2731
	if (rx->sta)
		rx->sta->rx_packets++;
2732

2733
	return RX_QUEUED;
2734 2735
}

2736
/* TODO: use IEEE80211_RX_FRAGMENTED */
J
Johannes Berg 已提交
2737 2738
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
					struct ieee80211_rate *rate)
2739 2740 2741 2742 2743
{
	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
2744
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2745
	int needed_headroom;
2746

2747 2748 2749 2750 2751
	/*
	 * If cooked monitor has been processed already, then
	 * don't do it again. If not, set the flag.
	 */
	if (rx->flags & IEEE80211_RX_CMNTR)
2752
		goto out_free_skb;
2753
	rx->flags |= IEEE80211_RX_CMNTR;
2754

2755 2756 2757 2758
	/* If there are no cooked monitor interfaces, just free the SKB */
	if (!local->cooked_mntrs)
		goto out_free_skb;

2759
	/* room for the radiotap header based on driver features */
2760
	needed_headroom = ieee80211_rx_radiotap_space(local, status);
2761

2762 2763 2764
	if (skb_headroom(skb) < needed_headroom &&
	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
		goto out_free_skb;
2765

2766
	/* prepend radiotap information */
2767 2768
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 false);
2769 2770 2771 2772 2773 2774 2775

	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) {
2776
		if (!ieee80211_sdata_running(sdata))
2777 2778
			continue;

2779
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2780 2781 2782 2783 2784 2785 2786
		    !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
			continue;

		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
2787
				netif_receive_skb(skb2);
2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
			}
		}

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

	if (prev_dev) {
		skb->dev = prev_dev;
2798
		netif_receive_skb(skb);
2799 2800
		return;
	}
2801 2802 2803 2804 2805

 out_free_skb:
	dev_kfree_skb(skb);
}

2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
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];
2823 2824
		if (!(status->flag & RX_FLAG_HT) &&
		    !(status->flag & RX_FLAG_VHT))
2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840
			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;
	}
}
2841

2842 2843
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
				  struct sk_buff_head *frames)
2844 2845
{
	ieee80211_rx_result res = RX_DROP_MONITOR;
2846
	struct sk_buff *skb;
2847

2848 2849 2850 2851
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
2852
			goto rxh_next;  \
2853
	} while (0);
2854

2855
	spin_lock_bh(&rx->local->rx_path_lock);
2856

2857
	while ((skb = __skb_dequeue(frames))) {
2858 2859 2860 2861 2862 2863 2864 2865 2866
		/*
		 * 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
2867
		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2868 2869 2870 2871
		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
2872
#ifdef CONFIG_MAC80211_MESH
2873
		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2874
			CALL_RXH(ieee80211_rx_h_mesh_fwding);
I
Ingo Molnar 已提交
2875
#endif
2876
		CALL_RXH(ieee80211_rx_h_amsdu)
2877
		CALL_RXH(ieee80211_rx_h_data)
2878 2879 2880 2881 2882 2883

		/* special treatment -- needs the queue */
		res = ieee80211_rx_h_ctrl(rx, frames);
		if (res != RX_CONTINUE)
			goto rxh_next;

2884
		CALL_RXH(ieee80211_rx_h_mgmt_check)
2885
		CALL_RXH(ieee80211_rx_h_action)
2886 2887
		CALL_RXH(ieee80211_rx_h_userspace_mgmt)
		CALL_RXH(ieee80211_rx_h_action_return)
2888
		CALL_RXH(ieee80211_rx_h_mgmt)
2889

2890 2891
 rxh_next:
		ieee80211_rx_handlers_result(rx, res);
2892

2893
#undef CALL_RXH
2894
	}
2895

2896
	spin_unlock_bh(&rx->local->rx_path_lock);
2897 2898
}

2899
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2900
{
2901
	struct sk_buff_head reorder_release;
2902 2903
	ieee80211_rx_result res = RX_DROP_MONITOR;

2904 2905
	__skb_queue_head_init(&reorder_release);

2906 2907 2908 2909 2910 2911 2912 2913 2914
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_next;  \
	} while (0);

	CALL_RXH(ieee80211_rx_h_check)

2915
	ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2916

2917
	ieee80211_rx_handlers(rx, &reorder_release);
2918
	return;
2919

2920
 rxh_next:
2921 2922 2923
	ieee80211_rx_handlers_result(rx, res);

#undef CALL_RXH
2924 2925
}

2926
/*
2927 2928
 * This function makes calls into the RX path, therefore
 * it has to be invoked under RCU read lock.
2929 2930 2931
 */
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
2932
	struct sk_buff_head frames;
2933 2934 2935 2936
	struct ieee80211_rx_data rx = {
		.sta = sta,
		.sdata = sta->sdata,
		.local = sta->local,
2937 2938 2939
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
2940
		.flags = 0,
2941
	};
2942 2943 2944 2945 2946
	struct tid_ampdu_rx *tid_agg_rx;

	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		return;
2947

2948 2949
	__skb_queue_head_init(&frames);

2950
	spin_lock(&tid_agg_rx->reorder_lock);
2951
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2952
	spin_unlock(&tid_agg_rx->reorder_lock);
2953

2954
	ieee80211_rx_handlers(&rx, &frames);
2955 2956
}

2957 2958
/* main receive path */

2959
static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2960 2961
				struct ieee80211_hdr *hdr)
{
2962
	struct ieee80211_sub_if_data *sdata = rx->sdata;
J
Johannes Berg 已提交
2963 2964 2965
	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);
2966 2967
	int multicast = is_multicast_ether_addr(hdr->addr1);

2968
	switch (sdata->vif.type) {
2969
	case NL80211_IFTYPE_STATION:
2970
		if (!bssid && !sdata->u.mgd.use_4addr)
2971
			return 0;
2972
		if (!multicast &&
2973
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2974 2975
			if (!(sdata->dev->flags & IFF_PROMISC) ||
			    sdata->u.mgd.use_4addr)
2976
				return 0;
2977
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2978 2979
		}
		break;
2980
	case NL80211_IFTYPE_ADHOC:
2981 2982
		if (!bssid)
			return 0;
2983
		if (ieee80211_is_beacon(hdr->frame_control)) {
B
Bruno Randolf 已提交
2984
			return 1;
J
Johannes Berg 已提交
2985 2986
		} else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
			return 0;
2987
		} else if (!multicast &&
2988
			   !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2989
			if (!(sdata->dev->flags & IFF_PROMISC))
2990
				return 0;
2991
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2992 2993
		} else if (!rx->sta) {
			int rate_idx;
2994 2995
			if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
				rate_idx = 0; /* TODO: HT/VHT rates */
2996
			else
J
Johannes Berg 已提交
2997
				rate_idx = status->rate_idx;
2998 2999
			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
						 BIT(rate_idx));
3000
		}
3001
		break;
3002
	case NL80211_IFTYPE_MESH_POINT:
3003
		if (!multicast &&
3004
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3005 3006 3007
			if (!(sdata->dev->flags & IFF_PROMISC))
				return 0;

3008
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3009 3010
		}
		break;
3011 3012
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
3013
		if (!bssid) {
3014
			if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3015
				return 0;
3016
		} else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3017 3018 3019 3020 3021 3022
			/*
			 * 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
3023
			if (ieee80211_is_public_action(hdr, skb->len))
3024
				return 1;
J
Johannes Berg 已提交
3025
			if (!ieee80211_is_beacon(hdr->frame_control))
3026
				return 0;
3027
			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3028 3029
		}
		break;
3030
	case NL80211_IFTYPE_WDS:
3031
		if (bssid || !ieee80211_is_data(hdr->frame_control))
3032
			return 0;
3033
		if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3034 3035
			return 0;
		break;
3036 3037 3038 3039 3040 3041 3042 3043 3044
	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;
3045
	default:
J
Johannes Berg 已提交
3046
		/* should never get here */
3047
		WARN_ON_ONCE(1);
J
Johannes Berg 已提交
3048
		break;
3049 3050 3051 3052 3053
	}

	return 1;
}

3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069
/*
 * 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;
3070
	status->rx_flags |= IEEE80211_RX_RA_MATCH;
3071 3072 3073 3074 3075 3076 3077 3078 3079 3080
	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,
3081
					"failed to copy skb for %s\n",
3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
					sdata->name);
			return true;
		}

		rx->skb = skb;
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

3093
/*
3094 3095
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
3096
 */
3097
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3098
					 struct sk_buff *skb)
3099 3100 3101 3102
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
Z
Zhu Yi 已提交
3103
	__le16 fc;
3104
	struct ieee80211_rx_data rx;
3105
	struct ieee80211_sub_if_data *prev;
3106
	struct sta_info *sta, *tmp, *prev_sta;
Z
Zhu Yi 已提交
3107
	int err = 0;
3108

Z
Zhu Yi 已提交
3109
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3110 3111 3112
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
3113

Z
Zhu Yi 已提交
3114
	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3115 3116
		local->dot11ReceivedFragmentCount++;

3117 3118 3119 3120 3121 3122 3123
	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
3124
		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3125
	}
Z
Zhu Yi 已提交
3126 3127 3128 3129 3130 3131 3132

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

	hdr = (struct ieee80211_hdr *)skb->data;
3133
	ieee80211_parse_qos(&rx);
3134
	ieee80211_verify_alignment(&rx);
3135

J
Johannes Berg 已提交
3136 3137 3138 3139
	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
3140
	if (ieee80211_is_data(fc)) {
3141
		prev_sta = NULL;
3142

3143
		for_each_sta_info(local, hdr->addr2, sta, tmp) {
3144 3145 3146 3147 3148 3149 3150
			if (!prev_sta) {
				prev_sta = sta;
				continue;
			}

			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;
3151
			ieee80211_prepare_and_rx_handle(&rx, skb, false);
3152

3153
			prev_sta = sta;
3154
		}
3155 3156 3157 3158 3159

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

3160
			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3161
				return;
3162
			goto out;
3163
		}
3164 3165
	}

3166
	prev = NULL;
3167

3168 3169 3170
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
J
Johannes Berg 已提交
3171

3172 3173 3174
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
J
Johannes Berg 已提交
3175

3176 3177 3178 3179 3180
		/*
		 * 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
		 */
3181

3182
		if (!prev) {
3183
			prev = sdata;
3184
			continue;
J
Johannes Berg 已提交
3185
		}
3186

3187
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3188 3189
		rx.sdata = prev;
		ieee80211_prepare_and_rx_handle(&rx, skb, false);
3190

3191 3192 3193 3194
		prev = sdata;
	}

	if (prev) {
3195
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
3196
		rx.sdata = prev;
3197

3198 3199
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
3200
	}
3201

3202
 out:
3203
	dev_kfree_skb(skb);
3204
}
3205 3206 3207 3208 3209

/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
3210
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3211 3212
{
	struct ieee80211_local *local = hw_to_local(hw);
3213 3214
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;
3215
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3216

3217 3218
	WARN_ON_ONCE(softirq_count() == 0);

J
Johannes Berg 已提交
3219
	if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
J
Johannes Berg 已提交
3220
		goto drop;
3221 3222

	sband = local->hw.wiphy->bands[status->band];
J
Johannes Berg 已提交
3223 3224
	if (WARN_ON(!sband))
		goto drop;
3225

J
Johannes Berg 已提交
3226 3227 3228 3229 3230 3231 3232
	/*
	 * 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
3233 3234
	if (unlikely(local->quiescing || local->suspended))
		goto drop;
J
Johannes Berg 已提交
3235

3236 3237 3238 3239
	/* We might be during a HW reconfig, prevent Rx for the same reason */
	if (unlikely(local->in_reconfig))
		goto drop;

3240 3241 3242 3243
	/*
	 * The same happens when we're not even started,
	 * but that's worth a warning.
	 */
J
Johannes Berg 已提交
3244 3245
	if (WARN_ON(!local->started))
		goto drop;
3246

3247
	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3248
		/*
3249 3250
		 * Validate the rate, unless a PLCP error means that
		 * we probably can't have a valid rate here anyway.
3251
		 */
3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263

		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
3264
			if (WARN(status->rate_idx > 76,
3265 3266 3267 3268 3269 3270
				 "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;
3271 3272 3273 3274 3275 3276 3277
		} 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;
3278
		} else {
J
Johannes Berg 已提交
3279
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3280 3281 3282
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
3283
	}
3284

3285 3286
	status->rx_flags = 0;

3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299
	/*
	 * 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.
	 */
3300
	skb = ieee80211_rx_monitor(local, skb, rate);
3301 3302 3303 3304 3305
	if (!skb) {
		rcu_read_unlock();
		return;
	}

3306 3307 3308
	ieee80211_tpt_led_trig_rx(local,
			((struct ieee80211_hdr *)skb->data)->frame_control,
			skb->len);
3309
	__ieee80211_rx_handle_packet(hw, skb);
3310 3311

	rcu_read_unlock();
J
Johannes Berg 已提交
3312 3313 3314 3315

	return;
 drop:
	kfree_skb(skb);
3316
}
3317
EXPORT_SYMBOL(ieee80211_rx);
3318 3319 3320

/* 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 */
3321
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
{
	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);