rx.c 59.0 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * 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/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 <net/mac80211.h>
#include <net/ieee80211_radiotap.h>

#include "ieee80211_i.h"
#include "ieee80211_led.h"
#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"

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u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
				struct tid_ampdu_rx *tid_agg_rx,
				struct sk_buff *skb, u16 mpdu_seq_num,
				int bar_req);
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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,
					   struct sk_buff *skb,
					   int rtap_len)
{
	skb_pull(skb, rtap_len);

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

	return skb;
}

static inline int should_drop_frame(struct ieee80211_rx_status *status,
				    struct sk_buff *skb,
				    int present_fcs_len,
				    int radiotap_len)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		return 1;
	if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
		return 1;
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	if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
			cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
	    ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
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			cpu_to_le16(IEEE80211_STYPE_PSPOLL)) &&
	    ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
			cpu_to_le16(IEEE80211_STYPE_BACK_REQ)))
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		return 1;
	return 0;
}

/*
 * 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_rx_status *status,
		     struct ieee80211_rate *rate)
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{
	struct ieee80211_sub_if_data *sdata;
	int needed_headroom = 0;
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	struct ieee80211_radiotap_header *rthdr;
	__le64 *rttsft = NULL;
	struct ieee80211_rtap_fixed_data {
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		u8 flags;
		u8 rate;
		__le16 chan_freq;
		__le16 chan_flags;
		u8 antsignal;
		u8 padding_for_rxflags;
		__le16 rx_flags;
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	} __attribute__ ((packed)) *rtfixed;
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	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;
	int rtap_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.
	 */
	if (status->flag & RX_FLAG_RADIOTAP)
		rtap_len = ieee80211_get_radiotap_len(origskb->data);
	else
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		/* room for radiotap header, always present fields and TSFT */
		needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
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	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
		present_fcs_len = FCS_LEN;

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

		return remove_monitor_info(local, origskb, rtap_len);
	}

	if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
		/* 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);

		origskb = remove_monitor_info(local, origskb, rtap_len);

		if (!skb)
			return origskb;
	}

	/* if necessary, prepend radiotap information */
	if (!(status->flag & RX_FLAG_RADIOTAP)) {
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		rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
		rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
		if (status->flag & RX_FLAG_TSFT) {
			rttsft = (void *) skb_push(skb, sizeof(*rttsft));
			rtap_len += 8;
		}
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		rthdr = (void *) skb_push(skb, sizeof(*rthdr));
		memset(rthdr, 0, sizeof(*rthdr));
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		memset(rtfixed, 0, sizeof(*rtfixed));
		rthdr->it_present =
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			cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
				    (1 << IEEE80211_RADIOTAP_RATE) |
				    (1 << IEEE80211_RADIOTAP_CHANNEL) |
				    (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
				    (1 << IEEE80211_RADIOTAP_RX_FLAGS));
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		rtfixed->flags = 0;
		if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
			rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;

		if (rttsft) {
			*rttsft = cpu_to_le64(status->mactime);
			rthdr->it_present |=
				cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
		}
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		/* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
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		rtfixed->rx_flags = 0;
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		if (status->flag &
		    (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
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			rtfixed->rx_flags |=
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				cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);

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		rtfixed->rate = rate->bitrate / 5;
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		rtfixed->chan_freq = cpu_to_le16(status->freq);
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		if (status->band == IEEE80211_BAND_5GHZ)
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			rtfixed->chan_flags =
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				cpu_to_le16(IEEE80211_CHAN_OFDM |
					    IEEE80211_CHAN_5GHZ);
		else
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			rtfixed->chan_flags =
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				cpu_to_le16(IEEE80211_CHAN_DYN |
					    IEEE80211_CHAN_2GHZ);

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		rtfixed->antsignal = status->ssi;
		rthdr->it_len = cpu_to_le16(rtap_len);
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	}

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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) {
		if (!netif_running(sdata->dev))
			continue;

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		if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
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			continue;

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

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

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

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

	return origskb;
}


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static void ieee80211_parse_qos(struct ieee80211_txrx_data *rx)
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{
	u8 *data = rx->skb->data;
	int tid;

	/* does the frame have a qos control field? */
	if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
		u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
		/* frame has qos control */
		tid = qc[0] & QOS_CONTROL_TID_MASK;
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		if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
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			rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
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		else
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			rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
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	} else {
		if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
			/* Separate TID for management frames */
			tid = NUM_RX_DATA_QUEUES - 1;
		} else {
			/* no qos control present */
			tid = 0; /* 802.1d - Best Effort */
		}
	}
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	I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
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	/* only a debug counter, sta might not be assigned properly yet */
	if (rx->sta)
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		I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);

	rx->u.rx.queue = tid;
	/* 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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static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx)
{
#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
	int hdrlen;

	if (!WLAN_FC_DATA_PRESENT(rx->fc))
		return;

	/*
	 * Drivers are required to align the payload data in a way that
	 * guarantees that the contained IP header is aligned to a four-
	 * byte boundary. In the case of regular frames, this simply means
	 * aligning the payload to a four-byte boundary (because either
	 * the IP header is directly contained, or IV/RFC1042 headers that
	 * have a length divisible by four are in front of it.
	 *
	 * With A-MSDU frames, however, the payload data address must
	 * yield two modulo four because there are 14-byte 802.3 headers
	 * within the A-MSDU frames that push the IP header further back
	 * to a multiple of four again. Thankfully, the specs were sane
	 * enough this time around to require padding each A-MSDU subframe
	 * to a length that is a multiple of four.
	 *
	 * Padding like atheros hardware adds which is inbetween the 802.11
	 * header and the payload is not supported, the driver is required
	 * to move the 802.11 header further back in that case.
	 */
	hdrlen = ieee80211_get_hdrlen(rx->fc);
	if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
		hdrlen += ETH_HLEN;
	WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
#endif
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}

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static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
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				   struct sk_buff *skb,
				   struct ieee80211_rx_status *status,
				   struct ieee80211_rate *rate)
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{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	u32 load = 0, hdrtime;

	/* Estimate total channel use caused by this frame */

	/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
	 * 1 usec = 1/8 * (1080 / 10) = 13.5 */

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	if (status->band == IEEE80211_BAND_5GHZ ||
	    (status->band == IEEE80211_BAND_5GHZ &&
	     rate->flags & IEEE80211_RATE_ERP_G))
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		hdrtime = CHAN_UTIL_HDR_SHORT;
	else
		hdrtime = CHAN_UTIL_HDR_LONG;

	load = hdrtime;
	if (!is_multicast_ether_addr(hdr->addr1))
		load += hdrtime;

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	/* TODO: optimise again */
	load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
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	/* Divide channel_use by 8 to avoid wrapping around the counter */
	load >>= CHAN_UTIL_SHIFT;

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	return load;
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}

/* rx handlers */

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static ieee80211_rx_result
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ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
{
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	if (rx->sta)
		rx->sta->channel_use_raw += rx->u.rx.load;
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	rx->sdata->channel_use_raw += rx->u.rx.load;
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	return RX_CONTINUE;
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}

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static ieee80211_rx_result
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ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb = rx->skb;

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	if (unlikely(local->sta_hw_scanning))
		return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);

	if (unlikely(local->sta_sw_scanning)) {
		/* drop all the other packets during a software scan anyway */
		if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
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		    != RX_QUEUED)
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			dev_kfree_skb(skb);
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		return RX_QUEUED;
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	}

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	if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
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		/* scanning finished during invoking of handlers */
		I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
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		return RX_DROP_UNUSABLE;
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	}

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	return RX_CONTINUE;
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}

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static ieee80211_rx_result
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ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_hdr *hdr;
	hdr = (struct ieee80211_hdr *) rx->skb->data;

	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
	if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
		if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
			     rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
			     hdr->seq_ctrl)) {
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			if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
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				rx->local->dot11FrameDuplicateCount++;
				rx->sta->num_duplicates++;
			}
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			return RX_DROP_MONITOR;
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		} else
			rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
	}

	if (unlikely(rx->skb->len < 16)) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
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		return RX_DROP_MONITOR;
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	}

	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
	 * 80211.o does filtering only based on association state, i.e., it
	 * drops Class 3 frames from not associated stations. hostapd sends
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
	if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
		      ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
		       (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
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		     rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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		     (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
		if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
		     !(rx->fc & IEEE80211_FCTL_TODS) &&
		     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
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		    || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
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			/* Drop IBSS frames and frames for other hosts
			 * silently. */
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			return RX_DROP_MONITOR;
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		}

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		return RX_DROP_MONITOR;
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	}

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	return RX_CONTINUE;
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}


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static ieee80211_rx_result
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ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
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{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
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	int keyidx;
	int hdrlen;
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	ieee80211_rx_result result = RX_DROP_UNUSABLE;
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	struct ieee80211_key *stakey = NULL;
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	/*
	 * Key selection 101
	 *
	 * There are three types of keys:
	 *  - GTK (group keys)
	 *  - PTK (pairwise keys)
	 *  - STK (station-to-station pairwise keys)
	 *
	 * When selecting a key, we have to distinguish between multicast
	 * (including broadcast) and unicast frames, the latter can only
	 * use PTKs and STKs while the former always use GTKs. Unless, of
	 * course, actual WEP keys ("pre-RSNA") are used, then unicast
	 * frames can also use key indizes like GTKs. Hence, if we don't
	 * have a PTK/STK we check the key index for a WEP key.
	 *
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	 * 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.
	 *
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	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
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	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
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	 */

	if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
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		return RX_CONTINUE;
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	/*
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	 * No point in finding a key and decrypting if the frame is neither
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	 * addressed to us nor a multicast frame.
	 */
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	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
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		return RX_CONTINUE;
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	if (rx->sta)
		stakey = rcu_dereference(rx->sta->key);

	if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
		rx->key = stakey;
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	} else {
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		/*
		 * The device doesn't give us the IV so we won't be
		 * able to look up the key. That's ok though, we
		 * don't need to decrypt the frame, we just won't
		 * be able to keep statistics accurate.
		 * Except for key threshold notifications, should
		 * we somehow allow the driver to tell us which key
		 * the hardware used if this flag is set?
		 */
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		if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
		    (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
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			return RX_CONTINUE;
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		hdrlen = ieee80211_get_hdrlen(rx->fc);

		if (rx->skb->len < 8 + hdrlen)
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			return RX_DROP_UNUSABLE; /* TODO: count this? */
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		/*
		 * no need to call ieee80211_wep_get_keyidx,
		 * it verifies a bunch of things we've done already
		 */
		keyidx = rx->skb->data[hdrlen + 3] >> 6;

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		rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
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		/*
		 * 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.
		 */
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		if (rx->key && rx->key->conf.alg != ALG_WEP &&
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		    !is_multicast_ether_addr(hdr->addr1))
			rx->key = NULL;
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	}

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	if (rx->key) {
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		rx->key->tx_rx_count++;
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		/* TODO: add threshold stuff again */
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	} else {
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#ifdef CONFIG_MAC80211_DEBUG
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		if (net_ratelimit())
			printk(KERN_DEBUG "%s: RX protected frame,"
			       " but have no key\n", rx->dev->name);
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#endif /* CONFIG_MAC80211_DEBUG */
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		return RX_DROP_MONITOR;
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	}

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	/* Check for weak IVs if possible */
	if (rx->sta && rx->key->conf.alg == ALG_WEP &&
	    ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
	    (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
	     !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
	    ieee80211_wep_is_weak_iv(rx->skb, rx->key))
		rx->sta->wep_weak_iv_count++;

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	switch (rx->key->conf.alg) {
	case ALG_WEP:
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		result = ieee80211_crypto_wep_decrypt(rx);
		break;
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	case ALG_TKIP:
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		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
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	case ALG_CCMP:
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		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
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	}

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

	return result;
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}

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static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
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	DECLARE_MAC_BUF(mac);

577 578 579 580 581 582 583
	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);

	if (sdata->bss)
		atomic_inc(&sdata->bss->num_sta_ps);
	sta->flags |= WLAN_STA_PS;
	sta->pspoll = 0;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
584 585
	printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
586 587 588 589 590 591 592 593 594 595
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
}

static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	int sent = 0;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_tx_packet_data *pkt_data;
596
	DECLARE_MAC_BUF(mac);
597 598 599 600 601 602 603 604 605 606 607 608 609

	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	if (sdata->bss)
		atomic_dec(&sdata->bss->num_sta_ps);
	sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
	sta->pspoll = 0;
	if (!skb_queue_empty(&sta->ps_tx_buf)) {
		if (local->ops->set_tim)
			local->ops->set_tim(local_to_hw(local), sta->aid, 0);
		if (sdata->bss)
			bss_tim_clear(local, sdata->bss, sta->aid);
	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
610 611
	printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
612 613 614 615 616
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
	/* Send all buffered frames to the station */
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
		sent++;
617
		pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
618 619 620 621 622 623 624
		dev_queue_xmit(skb);
	}
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
		local->total_ps_buffered--;
		sent++;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
625
		printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
626
		       "since STA not sleeping anymore\n", dev->name,
627
		       print_mac(mac, sta->addr), sta->aid);
628
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
629
		pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
630 631 632 633 634 635
		dev_queue_xmit(skb);
	}

	return sent;
}

636
static ieee80211_rx_result
637 638 639 640 641 642 643
ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
{
	struct sta_info *sta = rx->sta;
	struct net_device *dev = rx->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;

	if (!sta)
644
		return RX_CONTINUE;
645 646 647 648

	/* Update last_rx only for IBSS packets which are for the current
	 * BSSID to avoid keeping the current IBSS network alive in cases where
	 * other STAs are using different BSSID. */
649
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
650 651
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
						IEEE80211_IF_TYPE_IBSS);
652 653 654 655
		if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
			sta->last_rx = jiffies;
	} else
	if (!is_multicast_ether_addr(hdr->addr1) ||
656
	    rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
657 658 659 660 661 662 663
		/* Update last_rx only for unicast frames in order to prevent
		 * the Probe Request frames (the only broadcast frames from a
		 * STA in infrastructure mode) from keeping a connection alive.
		 */
		sta->last_rx = jiffies;
	}

664
	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
665
		return RX_CONTINUE;
666 667 668

	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
669 670 671
	sta->last_rssi = rx->u.rx.status->ssi;
	sta->last_signal = rx->u.rx.status->signal;
	sta->last_noise = rx->u.rx.status->noise;
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691

	if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
		/* Change STA power saving mode only in the end of a frame
		 * exchange sequence */
		if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
			rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
		else if (!(sta->flags & WLAN_STA_PS) &&
			 (rx->fc & IEEE80211_FCTL_PM))
			ap_sta_ps_start(dev, sta);
	}

	/* Drop data::nullfunc frames silently, since they are used only to
	 * control station power saving mode. */
	if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
	    (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
		/* Update counter and free packet here to avoid counting this
		 * as a dropped packed. */
		sta->rx_packets++;
		dev_kfree_skb(rx->skb);
692
		return RX_QUEUED;
693 694
	}

695
	return RX_CONTINUE;
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
} /* 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;
	int idx;

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

	if (!skb_queue_empty(&entry->skb_list)) {
#ifdef CONFIG_MAC80211_DEBUG
		struct ieee80211_hdr *hdr =
			(struct ieee80211_hdr *) entry->skb_list.next->data;
715 716
		DECLARE_MAC_BUF(mac);
		DECLARE_MAC_BUF(mac2);
717 718
		printk(KERN_DEBUG "%s: RX reassembly removed oldest "
		       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
719
		       "addr1=%s addr2=%s\n",
720 721
		       sdata->dev->name, idx,
		       jiffies - entry->first_frag_time, entry->seq,
722 723
		       entry->last_frag, print_mac(mac, hdr->addr1),
		       print_mac(mac2, hdr->addr2));
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
#endif /* CONFIG_MAC80211_DEBUG */
		__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,
			  u16 fc, unsigned int frag, unsigned int seq,
			  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;
		u16 f_fc;

		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;

		f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
		f_fc = le16_to_cpu(f_hdr->frame_control);

		if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
		    compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
		    compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
			continue;

771
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
772 773 774 775 776 777 778 779 780
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

781
static ieee80211_rx_result
782 783 784 785 786 787 788
ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_hdr *hdr;
	u16 sc;
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
789
	DECLARE_MAC_BUF(mac);
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808

	hdr = (struct ieee80211_hdr *) rx->skb->data;
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

	if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
		   (rx->skb)->len < 24 ||
		   is_multicast_ether_addr(hdr->addr1))) {
		/* not fragmented */
		goto out;
	}
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

	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,
						 rx->u.rx.queue, &(rx->skb));
809
		if (rx->key && rx->key->conf.alg == ALG_CCMP &&
810 811 812 813 814 815 816 817
		    (rx->fc & IEEE80211_FCTL_PROTECTED)) {
			/* Store CCMP PN so that we can verify that the next
			 * fragment has a sequential PN value. */
			entry->ccmp = 1;
			memcpy(entry->last_pn,
			       rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
			       CCMP_PN_LEN);
		}
818
		return RX_QUEUED;
819 820 821 822 823 824 825 826 827
	}

	/* This is a fragment for a frame that should already be pending in
	 * fragment cache. Add this fragment to the end of the pending entry.
	 */
	entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
					  rx->u.rx.queue, hdr);
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
828
		return RX_DROP_MONITOR;
829 830 831 832 833 834 835
	}

	/* 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;
836
		if (!rx->key || rx->key->conf.alg != ALG_CCMP)
J
Johannes Berg 已提交
837
			return RX_DROP_UNUSABLE;
838 839 840 841 842 843 844 845
		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
		rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
		if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
846 847
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: defrag: CCMP PN not "
848
				       "sequential A2=%s"
849 850
				       " PN=%02x%02x%02x%02x%02x%02x "
				       "(expected %02x%02x%02x%02x%02x%02x)\n",
851
				       rx->dev->name, print_mac(mac, hdr->addr2),
852 853 854
				       rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
				       rpn[5], pn[0], pn[1], pn[2], pn[3],
				       pn[4], pn[5]);
J
Johannes Berg 已提交
855
			return RX_DROP_UNUSABLE;
856 857 858 859 860 861 862 863 864 865
		}
		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
	}

	skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
	if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
		rx->skb = NULL;
866
		return RX_QUEUED;
867 868 869 870 871 872 873 874 875
	}

	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
876
			return RX_DROP_UNUSABLE;
877 878 879 880 881 882 883 884
		}
	}
	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 */
885
	rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
886 887 888 889 890 891 892 893

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
894
	return RX_CONTINUE;
895 896
}

897
static ieee80211_rx_result
898 899
ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
{
900
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
901 902
	struct sk_buff *skb;
	int no_pending_pkts;
903
	DECLARE_MAC_BUF(mac);
904 905 906 907

	if (likely(!rx->sta ||
		   (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
		   (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
908
		   !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
909
		return RX_CONTINUE;
910

911 912
	if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
	    (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
J
Johannes Berg 已提交
913
		return RX_DROP_UNUSABLE;
914

915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
	skb = skb_dequeue(&rx->sta->tx_filtered);
	if (!skb) {
		skb = skb_dequeue(&rx->sta->ps_tx_buf);
		if (skb)
			rx->local->total_ps_buffered--;
	}
	no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
		skb_queue_empty(&rx->sta->ps_tx_buf);

	if (skb) {
		struct ieee80211_hdr *hdr =
			(struct ieee80211_hdr *) skb->data;

		/* tell TX path to send one frame even though the STA may
		 * still remain is PS mode after this frame exchange */
		rx->sta->pspoll = 1;

#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
933 934
		printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
		       print_mac(mac, rx->sta->addr), rx->sta->aid,
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
		       skb_queue_len(&rx->sta->ps_tx_buf));
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

		/* Use MoreData flag to indicate whether there are more
		 * buffered frames for this STA */
		if (no_pending_pkts) {
			hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
			rx->sta->flags &= ~WLAN_STA_TIM;
		} else
			hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);

		dev_queue_xmit(skb);

		if (no_pending_pkts) {
			if (rx->local->ops->set_tim)
				rx->local->ops->set_tim(local_to_hw(rx->local),
						       rx->sta->aid, 0);
			if (rx->sdata->bss)
				bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
		}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
	} else if (!rx->u.rx.sent_ps_buffered) {
957
		printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
958
		       "though there is no buffered frames for it\n",
959
		       rx->dev->name, print_mac(mac, rx->sta->addr));
960 961 962 963
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

	}

964
	/* Free PS Poll skb here instead of returning RX_DROP that would
965 966 967
	 * count as an dropped frame. */
	dev_kfree_skb(rx->skb);

968
	return RX_QUEUED;
969 970
}

971
static ieee80211_rx_result
972 973 974 975 976 977 978
ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
{
	u16 fc = rx->fc;
	u8 *data = rx->skb->data;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;

	if (!WLAN_FC_IS_QOS_DATA(fc))
979
		return RX_CONTINUE;
980 981 982 983 984 985 986 987

	/* remove the qos control field, update frame type and meta-data */
	memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
	hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
	/* change frame type to non QOS */
	rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
	hdr->frame_control = cpu_to_le16(fc);

988
	return RX_CONTINUE;
989 990
}

991
static int
992
ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx)
993
{
994
	if (unlikely(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED))) {
995
#ifdef CONFIG_MAC80211_DEBUG
996 997 998
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: dropped frame "
			       "(unauthorized port)\n", rx->dev->name);
999
#endif /* CONFIG_MAC80211_DEBUG */
1000
		return -EACCES;
1001 1002
	}

1003
	return 0;
1004 1005
}

1006
static int
1007
ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx)
1008
{
1009
	/*
1010 1011
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1012
	 */
1013
	if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
1014
		return 0;
1015 1016 1017 1018 1019

	/* Drop unencrypted frames if key is set. */
	if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
		     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
		     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1020
		     (rx->key || rx->sdata->drop_unencrypted))) {
1021 1022 1023
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
			       "encryption\n", rx->dev->name);
1024
		return -EACCES;
1025
	}
1026
	return 0;
1027 1028
}

1029 1030
static int
ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1031 1032 1033 1034 1035 1036 1037
{
	struct net_device *dev = rx->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	u16 fc, hdrlen, ethertype;
	u8 *payload;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
1038
	struct sk_buff *skb = rx->skb;
1039
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1040 1041 1042 1043
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
	DECLARE_MAC_BUF(mac3);
	DECLARE_MAC_BUF(mac4);
1044 1045 1046 1047

	fc = rx->fc;

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1048
		return -1;
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067

	hdrlen = ieee80211_get_hdrlen(fc);

	/* convert IEEE 802.11 header + possible LLC headers into Ethernet
	 * header
	 * IEEE 802.11 address fields:
	 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
	 *   0     0   DA    SA    BSSID n/a
	 *   0     1   DA    BSSID SA    n/a
	 *   1     0   BSSID SA    DA    n/a
	 *   1     1   RA    TA    DA    SA
	 */

	switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
	case IEEE80211_FCTL_TODS:
		/* BSSID SA DA */
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);

1068 1069
		if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
			     sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
1070 1071
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: dropped ToDS frame "
1072
				       "(BSSID=%s SA=%s DA=%s)\n",
1073
				       dev->name,
1074 1075 1076
				       print_mac(mac, hdr->addr1),
				       print_mac(mac2, hdr->addr2),
				       print_mac(mac3, hdr->addr3));
1077
			return -1;
1078 1079 1080 1081 1082 1083 1084
		}
		break;
	case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
		/* RA TA DA SA */
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr4, ETH_ALEN);

1085
		if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) {
1086 1087
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1088
				       "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1089
				       rx->dev->name,
1090 1091 1092 1093
				       print_mac(mac, hdr->addr1),
				       print_mac(mac2, hdr->addr2),
				       print_mac(mac3, hdr->addr3),
				       print_mac(mac4, hdr->addr4));
1094
			return -1;
1095 1096 1097 1098 1099 1100 1101
		}
		break;
	case IEEE80211_FCTL_FROMDS:
		/* DA BSSID SA */
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr3, ETH_ALEN);

1102
		if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1103 1104
		    (is_multicast_ether_addr(dst) &&
		     !compare_ether_addr(src, dev->dev_addr)))
1105
			return -1;
1106 1107 1108 1109 1110 1111
		break;
	case 0:
		/* DA SA BSSID */
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);

1112
		if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1113
			if (net_ratelimit()) {
1114 1115 1116 1117 1118 1119
				printk(KERN_DEBUG "%s: dropped IBSS frame "
				       "(DA=%s SA=%s BSSID=%s)\n",
				       dev->name,
				       print_mac(mac, hdr->addr1),
				       print_mac(mac2, hdr->addr2),
				       print_mac(mac3, hdr->addr3));
1120
			}
1121
			return -1;
1122 1123 1124 1125 1126 1127 1128 1129 1130
		}
		break;
	}

	if (unlikely(skb->len - hdrlen < 8)) {
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: RX too short data frame "
			       "payload\n", dev->name);
		}
1131
		return -1;
1132 1133
	}

1134
	payload = skb->data + hdrlen;
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	ethertype = (payload[6] << 8) | payload[7];

	if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
		    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
		   compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
		/* remove RFC1042 or Bridge-Tunnel encapsulation and
		 * replace EtherType */
		skb_pull(skb, hdrlen + 6);
		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
	} else {
		struct ethhdr *ehdr;
		__be16 len;
1148

1149 1150 1151 1152 1153 1154 1155
		skb_pull(skb, hdrlen);
		len = htons(skb->len);
		ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
		memcpy(ehdr->h_dest, dst, ETH_ALEN);
		memcpy(ehdr->h_source, src, ETH_ALEN);
		ehdr->h_proto = len;
	}
1156 1157
	return 0;
}
1158

1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
/*
 * requires that rx->skb is a frame with ethernet header
 */
static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx)
{
	static const u8 pae_group_addr[ETH_ALEN]
		= { 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.
	 */
	if (ehdr->h_proto == htons(ETH_P_PAE) &&
	    (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
	     compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
	    ieee80211_drop_unencrypted(rx))
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
1187 1188 1189 1190 1191 1192 1193
static void
ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
{
	struct net_device *dev = rx->dev;
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb, *xmit_skb;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194 1195
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1196

1197 1198
	skb = rx->skb;
	xmit_skb = NULL;
1199

1200 1201
	if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
				      sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1202
	    (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1203 1204 1205 1206 1207
		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
			 */
1208 1209
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
			if (!xmit_skb && net_ratelimit())
1210 1211 1212 1213
				printk(KERN_DEBUG "%s: failed to clone "
				       "multicast frame\n", dev->name);
		} else {
			dsta = sta_info_get(local, skb->data);
1214 1215 1216 1217 1218 1219
			if (dsta && dsta->dev == dev) {
				/*
				 * 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.
1220
				 */
1221
				xmit_skb = skb;
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
				skb = NULL;
			}
			if (dsta)
				sta_info_put(dsta);
		}
	}

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

1236
	if (xmit_skb) {
1237
		/* send to wireless media */
1238
		xmit_skb->protocol = htons(ETH_P_802_3);
1239 1240
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1241
		dev_queue_xmit(xmit_skb);
1242
	}
1243 1244
}

1245
static ieee80211_rx_result
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
{
	struct net_device *dev = rx->dev;
	struct ieee80211_local *local = rx->local;
	u16 fc, ethertype;
	u8 *payload;
	struct sk_buff *skb = rx->skb, *frame = NULL;
	const struct ethhdr *eth;
	int remaining, err;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	DECLARE_MAC_BUF(mac);

	fc = rx->fc;
	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1261
		return RX_CONTINUE;
1262 1263

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
J
Johannes Berg 已提交
1264
		return RX_DROP_MONITOR;
1265

1266
	if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
1267
		return RX_CONTINUE;
1268 1269 1270

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1271
		return RX_DROP_UNUSABLE;
1272 1273 1274 1275 1276 1277 1278 1279 1280

	skb->dev = dev;

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

	/* skip the wrapping header */
	eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
	if (!eth)
J
Johannes Berg 已提交
1281
		return RX_DROP_UNUSABLE;
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295

	while (skb != frame) {
		u8 padding;
		__be16 len = eth->h_proto;
		unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);

		remaining = skb->len;
		memcpy(dst, eth->h_dest, ETH_ALEN);
		memcpy(src, eth->h_source, ETH_ALEN);

		padding = ((4 - subframe_len) & 0x3);
		/* the last MSDU has no padding */
		if (subframe_len > remaining) {
			printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
J
Johannes Berg 已提交
1296
			return RX_DROP_UNUSABLE;
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
		}

		skb_pull(skb, sizeof(struct ethhdr));
		/* if last subframe reuse skb */
		if (remaining <= subframe_len + padding)
			frame = skb;
		else {
			frame = dev_alloc_skb(local->hw.extra_tx_headroom +
					      subframe_len);

			if (frame == NULL)
J
Johannes Berg 已提交
1308
				return RX_DROP_UNUSABLE;
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320

			skb_reserve(frame, local->hw.extra_tx_headroom +
				    sizeof(struct ethhdr));
			memcpy(skb_put(frame, ntohs(len)), skb->data,
				ntohs(len));

			eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
							padding);
			if (!eth) {
				printk(KERN_DEBUG "%s: wrong buffer size ",
				       dev->name);
				dev_kfree_skb(frame);
J
Johannes Berg 已提交
1321
				return RX_DROP_UNUSABLE;
1322 1323 1324
			}
		}

1325
		skb_reset_network_header(frame);
1326 1327 1328 1329 1330 1331 1332 1333
		frame->dev = dev;
		frame->priority = skb->priority;
		rx->skb = frame;

		payload = frame->data;
		ethertype = (payload[6] << 8) | payload[7];

		if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1334 1335 1336
			    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
			   compare_ether_addr(payload,
					      bridge_tunnel_header) == 0)) {
1337 1338 1339 1340 1341 1342
			/* remove RFC1042 or Bridge-Tunnel
			 * encapsulation and replace EtherType */
			skb_pull(frame, 6);
			memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
			memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
		} else {
1343 1344
			memcpy(skb_push(frame, sizeof(__be16)),
			       &len, sizeof(__be16));
1345 1346 1347 1348
			memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
			memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
		}

1349 1350
		if (!ieee80211_frame_allowed(rx)) {
			if (skb == frame) /* last frame */
J
Johannes Berg 已提交
1351
				return RX_DROP_UNUSABLE;
1352 1353 1354
			dev_kfree_skb(frame);
			continue;
		}
1355 1356 1357 1358

		ieee80211_deliver_skb(rx);
	}

1359
	return RX_QUEUED;
1360 1361
}

1362
static ieee80211_rx_result
1363 1364 1365 1366
ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
{
	struct net_device *dev = rx->dev;
	u16 fc;
1367
	int err;
1368 1369 1370

	fc = rx->fc;
	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1371
		return RX_CONTINUE;
1372 1373

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
J
Johannes Berg 已提交
1374
		return RX_DROP_MONITOR;
1375 1376 1377

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1378
		return RX_DROP_UNUSABLE;
1379

1380
	if (!ieee80211_frame_allowed(rx))
J
Johannes Berg 已提交
1381
		return RX_DROP_MONITOR;
1382

1383 1384 1385 1386 1387 1388
	rx->skb->dev = dev;

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

	ieee80211_deliver_skb(rx);
1389

1390
	return RX_QUEUED;
1391 1392
}

1393
static ieee80211_rx_result
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb = rx->skb;
	struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

	if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1405
		return RX_CONTINUE;
1406 1407 1408

	if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
		if (!rx->sta)
1409
			return RX_CONTINUE;
1410 1411 1412
		tid = le16_to_cpu(bar->control) >> 12;
		tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
1413
			return RX_CONTINUE;
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429

		start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;

		/* reset session timer */
		if (tid_agg_rx->timeout) {
			unsigned long expires =
				jiffies + (tid_agg_rx->timeout / 1000) * HZ;
			mod_timer(&tid_agg_rx->session_timer, expires);
		}

		/* manage reordering buffer according to requested */
		/* sequence number */
		rcu_read_lock();
		ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
						 start_seq_num, 1);
		rcu_read_unlock();
J
Johannes Berg 已提交
1430
		return RX_DROP_UNUSABLE;
1431 1432
	}

1433
	return RX_CONTINUE;
1434 1435
}

1436
static ieee80211_rx_result
1437 1438 1439 1440
ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_sub_if_data *sdata;

1441
	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
J
Johannes Berg 已提交
1442
		return RX_DROP_MONITOR;
1443 1444

	sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1445 1446
	if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
	     sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
1447
	    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1448
		ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1449
	else
J
Johannes Berg 已提交
1450
		return RX_DROP_MONITOR;
1451

1452
	return RX_QUEUED;
1453 1454 1455 1456 1457 1458 1459
}

static void ieee80211_rx_michael_mic_report(struct net_device *dev,
					    struct ieee80211_hdr *hdr,
					    struct ieee80211_txrx_data *rx)
{
	int keyidx, hdrlen;
1460 1461
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
1462 1463 1464 1465 1466 1467 1468

	hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
	if (rx->skb->len >= hdrlen + 4)
		keyidx = rx->skb->data[hdrlen + 3] >> 6;
	else
		keyidx = -1;

1469 1470
	if (net_ratelimit())
		printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1471 1472 1473
		       "failure from %s to %s keyidx=%d\n",
		       dev->name, print_mac(mac, hdr->addr2),
		       print_mac(mac2, hdr->addr1), keyidx);
1474

1475
	if (!rx->sta) {
1476 1477 1478 1479
		/*
		 * Some hardware seem to generate incorrect Michael MIC
		 * reports; ignore them to avoid triggering countermeasures.
		 */
1480 1481
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1482 1483
			       "error for unknown address %s\n",
			       dev->name, print_mac(mac, hdr->addr2));
1484 1485 1486 1487
		goto ignore;
	}

	if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1488 1489
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1490
			       "error for a frame with no PROTECTED flag (src "
1491
			       "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1492 1493 1494
		goto ignore;
	}

1495
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1496 1497 1498 1499 1500 1501
		/*
		 * APs with pairwise keys should never receive Michael MIC
		 * errors for non-zero keyidx because these are reserved for
		 * group keys and only the AP is sending real multicast
		 * frames in the BSS.
		 */
J
Johannes Berg 已提交
1502 1503 1504
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: ignored Michael MIC error for "
			       "a frame with non-zero keyidx (%d)"
1505 1506
			       " (src %s)\n", dev->name, keyidx,
			       print_mac(mac, hdr->addr2));
J
Johannes Berg 已提交
1507
		goto ignore;
1508 1509 1510 1511 1512
	}

	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
	    ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
	     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1513 1514 1515
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
			       "error for a frame that cannot be encrypted "
1516 1517
			       "(fc=0x%04x) (src %s)\n",
			       dev->name, rx->fc, print_mac(mac, hdr->addr2));
1518 1519 1520
		goto ignore;
	}

J
Johannes Berg 已提交
1521
	mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1522 1523 1524 1525 1526
 ignore:
	dev_kfree_skb(rx->skb);
	rx->skb = NULL;
}

1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
static void ieee80211_rx_cooked_monitor(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local = rx->local;
	struct ieee80211_rtap_hdr {
		struct ieee80211_radiotap_header hdr;
		u8 flags;
		u8 rate;
		__le16 chan_freq;
		__le16 chan_flags;
	} __attribute__ ((packed)) *rthdr;
	struct sk_buff *skb = rx->skb, *skb2;
	struct net_device *prev_dev = NULL;
	struct ieee80211_rx_status *status = rx->u.rx.status;

	if (rx->flags & IEEE80211_TXRXD_RX_CMNTR_REPORTED)
		goto out_free_skb;

	if (skb_headroom(skb) < sizeof(*rthdr) &&
	    pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
		goto out_free_skb;

	rthdr = (void *)skb_push(skb, sizeof(*rthdr));
	memset(rthdr, 0, sizeof(*rthdr));
	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
	rthdr->hdr.it_present =
		cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
			    (1 << IEEE80211_RADIOTAP_RATE) |
			    (1 << IEEE80211_RADIOTAP_CHANNEL));

	rthdr->rate = rx->u.rx.rate->bitrate / 5;
	rthdr->chan_freq = cpu_to_le16(status->freq);

	if (status->band == IEEE80211_BAND_5GHZ)
		rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
						IEEE80211_CHAN_5GHZ);
	else
		rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
						IEEE80211_CHAN_2GHZ);

	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) {
		if (!netif_running(sdata->dev))
			continue;

		if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
		    !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
			continue;

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

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

	if (prev_dev) {
		skb->dev = prev_dev;
		netif_rx(skb);
		skb = NULL;
	} else
		goto out_free_skb;

	rx->flags |= IEEE80211_TXRXD_RX_CMNTR_REPORTED;
	return;

 out_free_skb:
	dev_kfree_skb(skb);
}

1607 1608
typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_txrx_data *);
static ieee80211_rx_handler ieee80211_rx_handlers[] =
1609 1610 1611 1612
{
	ieee80211_rx_h_if_stats,
	ieee80211_rx_h_passive_scan,
	ieee80211_rx_h_check,
1613
	ieee80211_rx_h_decrypt,
1614
	ieee80211_rx_h_sta_process,
1615 1616 1617 1618 1619 1620 1621 1622
	ieee80211_rx_h_defragment,
	ieee80211_rx_h_ps_poll,
	ieee80211_rx_h_michael_mic_verify,
	/* this must be after decryption - so header is counted in MPDU mic
	 * must be before pae and data, so QOS_DATA format frames
	 * are not passed to user space by these functions
	 */
	ieee80211_rx_h_remove_qos_control,
1623
	ieee80211_rx_h_amsdu,
1624
	ieee80211_rx_h_data,
1625
	ieee80211_rx_h_ctrl,
1626 1627 1628 1629
	ieee80211_rx_h_mgmt,
	NULL
};

1630
static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1631
					 struct ieee80211_txrx_data *rx,
1632
					 struct sk_buff *skb)
1633 1634 1635 1636
{
	ieee80211_rx_handler *handler;
	ieee80211_rx_result res = RX_DROP_MONITOR;

1637 1638 1639 1640
	rx->skb = skb;
	rx->sdata = sdata;
	rx->dev = sdata->dev;

1641 1642 1643 1644 1645 1646 1647 1648
	for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) {
		res = (*handler)(rx);

		switch (res) {
		case RX_CONTINUE:
			continue;
		case RX_DROP_UNUSABLE:
		case RX_DROP_MONITOR:
1649 1650 1651
			I802_DEBUG_INC(sdata->local->rx_handlers_drop);
			if (rx->sta)
				rx->sta->rx_dropped++;
1652 1653
			break;
		case RX_QUEUED:
1654
			I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1655 1656 1657 1658 1659 1660
			break;
		}
		break;
	}

	switch (res) {
1661
	case RX_CONTINUE:
1662
	case RX_DROP_MONITOR:
1663 1664
		ieee80211_rx_cooked_monitor(rx);
		break;
1665 1666 1667 1668 1669 1670
	case RX_DROP_UNUSABLE:
		dev_kfree_skb(rx->skb);
		break;
	}
}

1671 1672
/* main receive path */

1673 1674 1675 1676 1677 1678
static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
				u8 *bssid, struct ieee80211_txrx_data *rx,
				struct ieee80211_hdr *hdr)
{
	int multicast = is_multicast_ether_addr(hdr->addr1);

1679
	switch (sdata->vif.type) {
1680 1681 1682 1683
	case IEEE80211_IF_TYPE_STA:
		if (!bssid)
			return 0;
		if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1684
			if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1685
				return 0;
1686
			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1687 1688 1689
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1690
			if (!(sdata->dev->flags & IFF_PROMISC))
1691
				return 0;
1692
			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1693 1694 1695 1696 1697
		}
		break;
	case IEEE80211_IF_TYPE_IBSS:
		if (!bssid)
			return 0;
B
Bruno Randolf 已提交
1698 1699 1700 1701
		if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
		    (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
			return 1;
		else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1702
			if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1703
				return 0;
1704
			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1705 1706 1707
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1708
			if (!(sdata->dev->flags & IFF_PROMISC))
1709
				return 0;
1710
			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1711 1712 1713 1714
		} else if (!rx->sta)
			rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
							 bssid, hdr->addr2);
		break;
J
Johannes Berg 已提交
1715
	case IEEE80211_IF_TYPE_VLAN:
1716 1717 1718 1719 1720 1721 1722
	case IEEE80211_IF_TYPE_AP:
		if (!bssid) {
			if (compare_ether_addr(sdata->dev->dev_addr,
					       hdr->addr1))
				return 0;
		} else if (!ieee80211_bssid_match(bssid,
					sdata->dev->dev_addr)) {
1723
			if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1724
				return 0;
1725
			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1726
		}
1727 1728
		if (sdata->dev == sdata->local->mdev &&
		    !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739
			/* do not receive anything via
			 * master device when not scanning */
			return 0;
		break;
	case IEEE80211_IF_TYPE_WDS:
		if (bssid ||
		    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
			return 0;
		if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
			return 0;
		break;
J
Johannes Berg 已提交
1740 1741 1742
	case IEEE80211_IF_TYPE_MNTR:
		/* take everything */
		break;
1743
	case IEEE80211_IF_TYPE_INVALID:
J
Johannes Berg 已提交
1744 1745 1746
		/* should never get here */
		WARN_ON(1);
		break;
1747 1748 1749 1750 1751
	}

	return 1;
}

1752
/*
1753 1754
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
1755
 */
1756 1757 1758
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
					 struct sk_buff *skb,
					 struct ieee80211_rx_status *status,
1759 1760
					 u32 load,
					 struct ieee80211_rate *rate)
1761 1762 1763 1764 1765 1766
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
	struct ieee80211_txrx_data rx;
	u16 type;
1767
	int prepares;
J
Johannes Berg 已提交
1768 1769 1770
	struct ieee80211_sub_if_data *prev = NULL;
	struct sk_buff *skb_new;
	u8 *bssid;
1771 1772 1773 1774 1775 1776 1777

	hdr = (struct ieee80211_hdr *) skb->data;
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;

	rx.u.rx.status = status;
1778
	rx.u.rx.load = load;
1779
	rx.u.rx.rate = rate;
1780
	rx.fc = le16_to_cpu(hdr->frame_control);
1781
	type = rx.fc & IEEE80211_FCTL_FTYPE;
1782

1783
	if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1784 1785
		local->dot11ReceivedFragmentCount++;

1786 1787
	rx.sta = sta_info_get(local, hdr->addr2);
	if (rx.sta) {
1788 1789 1790
		rx.dev = rx.sta->dev;
		rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
	}
1791 1792

	if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1793
		ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1794 1795 1796
		goto end;
	}

Z
Zhu Yi 已提交
1797
	if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1798
		rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1799

1800 1801 1802
	ieee80211_parse_qos(&rx);
	ieee80211_verify_ip_alignment(&rx);

1803 1804
	skb = rx.skb;

1805
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1806 1807 1808
		if (!netif_running(sdata->dev))
			continue;

1809
		if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1810 1811
			continue;

1812
		bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1813
		rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1814
		prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1815

1816
		if (!prepares)
1817
			continue;
J
Johannes Berg 已提交
1818

J
Johannes Berg 已提交
1819 1820 1821 1822 1823 1824 1825 1826 1827
		/*
		 * frame is destined for this interface, but if it's not
		 * also for the previous one we handle that after the
		 * loop to avoid copying the SKB once too much
		 */

		if (!prev) {
			prev = sdata;
			continue;
J
Johannes Berg 已提交
1828
		}
J
Johannes Berg 已提交
1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839

		/*
		 * frame was destined for the previous interface
		 * so invoke RX handlers for it
		 */

		skb_new = skb_copy(skb, GFP_ATOMIC);
		if (!skb_new) {
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: failed to copy "
				       "multicast frame for %s",
1840 1841
				       wiphy_name(local->hw.wiphy),
				       prev->dev->name);
J
Johannes Berg 已提交
1842 1843
			continue;
		}
1844
		rx.fc = le16_to_cpu(hdr->frame_control);
1845
		ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
J
Johannes Berg 已提交
1846
		prev = sdata;
1847
	}
J
Johannes Berg 已提交
1848
	if (prev) {
1849
		rx.fc = le16_to_cpu(hdr->frame_control);
1850
		ieee80211_invoke_rx_handlers(prev, &rx, skb);
J
Johannes Berg 已提交
1851 1852
	} else
		dev_kfree_skb(skb);
1853

J
Johannes Berg 已提交
1854
 end:
1855 1856
	if (rx.sta)
		sta_info_put(rx.sta);
1857
}
1858

1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
#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);
}


1878 1879 1880 1881
/*
 * As it function blongs to Rx path it must be called with
 * the proper rcu_read_lock protection for its flow.
 */
1882 1883 1884 1885 1886 1887 1888 1889 1890 1891
u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
				struct tid_ampdu_rx *tid_agg_rx,
				struct sk_buff *skb, u16 mpdu_seq_num,
				int bar_req)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rx_status status;
	u16 head_seq_num, buf_size;
	int index;
	u32 pkt_load;
1892 1893
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923

	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);
		return 1;
	}

	/* if frame sequence number exceeds our buffering window size or
	 * block Ack Request arrived - release stored frames */
	if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
		/* new head to the ordering buffer */
		if (bar_req)
			head_seq_num = mpdu_seq_num;
		else
			head_seq_num =
				seq_inc(seq_sub(mpdu_seq_num, buf_size));
		/* release stored frames up to new head to stack */
		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;

			if (tid_agg_rx->reorder_buf[index]) {
				/* release the reordered frames to stack */
				memcpy(&status,
					tid_agg_rx->reorder_buf[index]->cb,
					sizeof(status));
1924 1925
				sband = local->hw.wiphy->bands[status.band];
				rate = &sband->bitrates[status.rate_idx];
1926 1927
				pkt_load = ieee80211_rx_load_stats(local,
						tid_agg_rx->reorder_buf[index],
1928
						&status, rate);
1929 1930
				__ieee80211_rx_handle_packet(hw,
					tid_agg_rx->reorder_buf[index],
1931
					&status, pkt_load, rate);
1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
				tid_agg_rx->stored_mpdu_num--;
				tid_agg_rx->reorder_buf[index] = NULL;
			}
			tid_agg_rx->head_seq_num =
				seq_inc(tid_agg_rx->head_seq_num);
		}
		if (bar_req)
			return 1;
	}

	/* now the new frame is always in the range of the reordering */
	/* buffer window */
	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);
		return 1;
	}

	/* if arrived mpdu is in the right order and nothing else stored */
	/* release it immediately */
	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);
		return 0;
	}

	/* put the frame in the reordering buffer */
	tid_agg_rx->reorder_buf[index] = skb;
	tid_agg_rx->stored_mpdu_num++;
	/* 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;
	while (tid_agg_rx->reorder_buf[index]) {
		/* release the reordered frame back to stack */
		memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
			sizeof(status));
1971 1972
		sband = local->hw.wiphy->bands[status.band];
		rate = &sband->bitrates[status.rate_idx];
1973 1974
		pkt_load = ieee80211_rx_load_stats(local,
					tid_agg_rx->reorder_buf[index],
1975
					&status, rate);
1976
		__ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
1977
					     &status, pkt_load, rate);
1978 1979 1980 1981 1982 1983 1984 1985 1986
		tid_agg_rx->stored_mpdu_num--;
		tid_agg_rx->reorder_buf[index] = NULL;
		tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
		index =	seq_sub(tid_agg_rx->head_seq_num,
			tid_agg_rx->ssn) % tid_agg_rx->buf_size;
	}
	return 1;
}

1987 1988
static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
				     struct sk_buff *skb)
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct sta_info *sta;
	struct tid_ampdu_rx *tid_agg_rx;
	u16 fc, sc;
	u16 mpdu_seq_num;
	u8 ret = 0, *qc;
	int tid;

	sta = sta_info_get(local, hdr->addr2);
	if (!sta)
		return ret;

	fc = le16_to_cpu(hdr->frame_control);

	/* filter the QoS data rx stream according to
	 * STA/TID and check if this STA/TID is on aggregation */
	if (!WLAN_FC_IS_QOS_DATA(fc))
		goto end_reorder;

	qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN;
	tid = qc[0] & QOS_CONTROL_TID_MASK;
	tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]);

	if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
		goto end_reorder;

	/* null data frames are excluded */
2018
	if (unlikely(fc & IEEE80211_STYPE_NULLFUNC))
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
		goto end_reorder;

	/* new un-ordered ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout) {
		unsigned long expires =
			jiffies + (tid_agg_rx->timeout / 1000) * HZ;
		mod_timer(&tid_agg_rx->session_timer, expires);
	}

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
		ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr,
			tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
		ret = 1;
		goto end_reorder;
	}

	/* according to mpdu sequence number deal with reordering buffer */
	mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
	ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
						mpdu_seq_num, 0);
end_reorder:
	if (sta)
		sta_info_put(sta);
	return ret;
}

2049 2050 2051 2052 2053 2054 2055 2056 2057
/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
		    struct ieee80211_rx_status *status)
{
	struct ieee80211_local *local = hw_to_local(hw);
	u32 pkt_load;
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;

	if (status->band < 0 ||
	    status->band > IEEE80211_NUM_BANDS) {
		WARN_ON(1);
		return;
	}

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

	if (!sband ||
	    status->rate_idx < 0 ||
	    status->rate_idx >= sband->n_bitrates) {
		WARN_ON(1);
		return;
	}

	rate = &sband->bitrates[status->rate_idx];
2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090

	/*
	 * 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.
	 */
2091
	skb = ieee80211_rx_monitor(local, skb, status, rate);
2092 2093 2094 2095 2096
	if (!skb) {
		rcu_read_unlock();
		return;
	}

2097
	pkt_load = ieee80211_rx_load_stats(local, skb, status, rate);
2098
	local->channel_use_raw += pkt_load;
2099

2100
	if (!ieee80211_rx_reorder_ampdu(local, skb))
2101
		__ieee80211_rx_handle_packet(hw, skb, status, pkt_load, rate);
2102 2103 2104

	rcu_read_unlock();
}
2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
EXPORT_SYMBOL(__ieee80211_rx);

/* This is a version of the rx handler that can be called from hard irq
 * context. Post the skb on the queue and schedule the tasklet */
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
			  struct ieee80211_rx_status *status)
{
	struct ieee80211_local *local = hw_to_local(hw);

	BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));

	skb->dev = local->mdev;
	/* copy status into skb->cb for use by tasklet */
	memcpy(skb->cb, status, sizeof(*status));
	skb->pkt_type = IEEE80211_RX_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_rx_irqsafe);