rx.c 58.7 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"
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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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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)
{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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	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 (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
ieee80211_rx_radiotap_len(struct ieee80211_local *local,
			  struct ieee80211_rx_status *status)
{
	int len;

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

	if (status->flag & RX_FLAG_TSFT)
		len += 8;
	if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
	    local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
		len += 1;
	if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
		len += 1;

	if (len & 1) /* padding for RX_FLAGS if necessary */
		len++;

	/* make sure radiotap starts at a naturally aligned address */
	if (len % 8)
		len = roundup(len, 8);

	return len;
}

/**
 * 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_rx_status *status,
				 struct ieee80211_rate *rate,
				 int rtap_len)
{
	struct ieee80211_radiotap_header *rthdr;
	unsigned char *pos;

	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_RATE) |
			    (1 << IEEE80211_RADIOTAP_CHANNEL) |
			    (1 << IEEE80211_RADIOTAP_ANTENNA) |
			    (1 << IEEE80211_RADIOTAP_RX_FLAGS));
	rthdr->it_len = cpu_to_le16(rtap_len);

	pos = (unsigned char *)(rthdr+1);

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

	/* IEEE80211_RADIOTAP_TSFT */
	if (status->flag & RX_FLAG_TSFT) {
		*(__le64 *)pos = cpu_to_le64(status->mactime);
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
		pos += 8;
	}

	/* IEEE80211_RADIOTAP_FLAGS */
	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
		*pos |= IEEE80211_RADIOTAP_F_FCS;
	pos++;

	/* IEEE80211_RADIOTAP_RATE */
	*pos = rate->bitrate / 5;
	pos++;

	/* IEEE80211_RADIOTAP_CHANNEL */
	*(__le16 *)pos = cpu_to_le16(status->freq);
	pos += 2;
	if (status->band == IEEE80211_BAND_5GHZ)
		*(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
					     IEEE80211_CHAN_5GHZ);
	else
		*(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
					     IEEE80211_CHAN_2GHZ);
	pos += 2;

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

	/* IEEE80211_RADIOTAP_DBM_ANTNOISE */
	if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
		*pos = status->noise;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
		pos++;
	}

	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */

	/* IEEE80211_RADIOTAP_ANTENNA */
	*pos = status->antenna;
	pos++;

	/* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
	if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
		*pos = status->signal;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
		pos++;
	}

	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */

	/* IEEE80211_RADIOTAP_RX_FLAGS */
	/* ensure 2 byte alignment for the 2 byte field as required */
	if ((pos - (unsigned char *)rthdr) & 1)
		pos++;
	/* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		*(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
	pos += 2;
}

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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_rx_status *status,
		     struct ieee80211_rate *rate)
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{
	struct ieee80211_sub_if_data *sdata;
	int needed_headroom = 0;
	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 the radiotap header based on driver features */
		needed_headroom = ieee80211_rx_radiotap_len(local, status);
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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 */
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	if (!(status->flag & RX_FLAG_RADIOTAP))
		ieee80211_add_rx_radiotap_header(local, skb, status, rate,
						 needed_headroom);
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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_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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	int tid;

	/* 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;
		if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
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			rx->flags |= IEEE80211_RX_AMSDU;
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		else
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			rx->flags &= ~IEEE80211_RX_AMSDU;
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	} else {
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		if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
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			/* 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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	rx->queue = tid;
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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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static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
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{
#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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	int hdrlen;

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	if (!ieee80211_is_data_present(hdr->frame_control))
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		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.
	 */
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	hdrlen = ieee80211_hdrlen(hdr->frame_control);
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	if (rx->flags & IEEE80211_RX_AMSDU)
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		hdrlen += ETH_HLEN;
	WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
#endif
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}

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/* rx handlers */

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static ieee80211_rx_result debug_noinline
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ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
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{
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb = rx->skb;

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	if (unlikely(local->sta_hw_scanning))
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		return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
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	if (unlikely(local->sta_sw_scanning)) {
		/* drop all the other packets during a software scan anyway */
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		if (ieee80211_sta_rx_scan(rx->dev, skb, 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_RX_IN_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_mesh_check(struct ieee80211_rx_data *rx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
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	if (ieee80211_is_data(hdr->frame_control)) {
		if (!ieee80211_has_a4(hdr->frame_control))
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			return RX_DROP_MONITOR;
		if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
			return RX_DROP_MONITOR;
	}

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

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	if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
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		struct ieee80211_mgmt *mgmt;
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		if (!ieee80211_is_mgmt(hdr->frame_control))
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			return RX_DROP_MONITOR;

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		if (ieee80211_is_action(hdr->frame_control)) {
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			mgmt = (struct ieee80211_mgmt *)hdr;
			if (mgmt->u.action.category != PLINK_CATEGORY)
				return RX_DROP_MONITOR;
			return RX_CONTINUE;
		}

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		if (ieee80211_is_probe_req(hdr->frame_control) ||
		    ieee80211_is_probe_resp(hdr->frame_control) ||
		    ieee80211_is_beacon(hdr->frame_control))
			return RX_CONTINUE;

		return RX_DROP_MONITOR;

	}

#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))

	if (ieee80211_is_data(hdr->frame_control) &&
	    is_multicast_ether_addr(hdr->addr1) &&
	    mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
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		return RX_DROP_MONITOR;
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#undef msh_h_get
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	return RX_CONTINUE;
}
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static ieee80211_rx_result debug_noinline
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ieee80211_rx_h_check(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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	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
	if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
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		if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
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			     rx->sta->last_seq_ctrl[rx->queue] ==
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			     hdr->seq_ctrl)) {
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			if (rx->flags & IEEE80211_RX_RA_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
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			rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
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	}

	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.
	 */
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	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
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		return ieee80211_rx_mesh_check(rx);

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	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
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		     rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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		     (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
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		if ((!ieee80211_has_fromds(hdr->frame_control) &&
		     !ieee80211_has_tods(hdr->frame_control) &&
		     ieee80211_is_data(hdr->frame_control)) ||
		    !(rx->flags & IEEE80211_RX_RA_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 debug_noinline
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ieee80211_rx_h_decrypt(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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	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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	 */

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	if (!ieee80211_has_protected(hdr->frame_control))
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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_RX_RA_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->status->flag & RX_FLAG_DECRYPTED) &&
		    (rx->status->flag & RX_FLAG_IV_STRIPPED))
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			return RX_CONTINUE;
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		hdrlen = ieee80211_hdrlen(hdr->frame_control);
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		if (rx->skb->len < 8 + hdrlen)
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590
			return RX_DROP_UNUSABLE; /* TODO: count this? */
591 592 593 594 595 596 597

		/*
		 * 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;

598
		rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
599 600 601 602 603 604

		/*
		 * 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.
		 */
605
		if (rx->key && rx->key->conf.alg != ALG_WEP &&
606 607
		    !is_multicast_ether_addr(hdr->addr1))
			rx->key = NULL;
608 609
	}

610
	if (rx->key) {
611
		rx->key->tx_rx_count++;
612
		/* TODO: add threshold stuff again */
613
	} else {
J
Johannes Berg 已提交
614
		return RX_DROP_MONITOR;
615 616
	}

617 618
	/* Check for weak IVs if possible */
	if (rx->sta && rx->key->conf.alg == ALG_WEP &&
619
	    ieee80211_is_data(hdr->frame_control) &&
620 621
	    (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
	     !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
622 623 624
	    ieee80211_wep_is_weak_iv(rx->skb, rx->key))
		rx->sta->wep_weak_iv_count++;

625 626
	switch (rx->key->conf.alg) {
	case ALG_WEP:
627 628
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
629
	case ALG_TKIP:
630 631
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
632
	case ALG_CCMP:
633 634
		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
635 636
	}

637
	/* either the frame has been decrypted or will be dropped */
638
	rx->status->flag |= RX_FLAG_DECRYPTED;
639 640

	return result;
641 642
}

643 644 645
static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
646 647
	DECLARE_MAC_BUF(mac);

648
	sdata = sta->sdata;
649 650 651

	if (sdata->bss)
		atomic_inc(&sdata->bss->num_sta_ps);
652
	set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
653
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
654 655
	printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
656 657 658 659 660 661 662 663 664
#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;
665
	struct ieee80211_tx_info *info;
666
	DECLARE_MAC_BUF(mac);
667

668
	sdata = sta->sdata;
669

670 671
	if (sdata->bss)
		atomic_dec(&sdata->bss->num_sta_ps);
672

673
	clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
674 675 676 677

	if (!skb_queue_empty(&sta->ps_tx_buf))
		sta_info_clear_tim_bit(sta);

678
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
679 680
	printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
681
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
682

683 684
	/* Send all buffered frames to the station */
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
685
		info = IEEE80211_SKB_CB(skb);
686
		sent++;
687
		info->flags |= IEEE80211_TX_CTL_REQUEUE;
688 689 690
		dev_queue_xmit(skb);
	}
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
691
		info = IEEE80211_SKB_CB(skb);
692 693 694
		local->total_ps_buffered--;
		sent++;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
695
		printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
696
		       "since STA not sleeping anymore\n", dev->name,
697
		       print_mac(mac, sta->addr), sta->aid);
698
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
699
		info->flags |= IEEE80211_TX_CTL_REQUEUE;
700 701 702 703 704 705
		dev_queue_xmit(skb);
	}

	return sent;
}

706
static ieee80211_rx_result debug_noinline
707
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
708 709 710
{
	struct sta_info *sta = rx->sta;
	struct net_device *dev = rx->dev;
711
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
712 713

	if (!sta)
714
		return RX_CONTINUE;
715 716 717 718

	/* 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. */
719
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
720 721
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
						IEEE80211_IF_TYPE_IBSS);
722 723 724 725
		if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
			sta->last_rx = jiffies;
	} else
	if (!is_multicast_ether_addr(hdr->addr1) ||
726
	    rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
727 728 729
		/* 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.
730 731
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
732 733 734 735
		 */
		sta->last_rx = jiffies;
	}

736
	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
737
		return RX_CONTINUE;
738 739 740

	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
741
	sta->last_signal = rx->status->signal;
742
	sta->last_qual = rx->status->qual;
743
	sta->last_noise = rx->status->noise;
744

745
	if (!ieee80211_has_morefrags(hdr->frame_control)) {
746 747
		/* Change STA power saving mode only in the end of a frame
		 * exchange sequence */
748
		if (test_sta_flags(sta, WLAN_STA_PS) &&
749
		    !ieee80211_has_pm(hdr->frame_control))
750
			rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
751
		else if (!test_sta_flags(sta, WLAN_STA_PS) &&
752
			 ieee80211_has_pm(hdr->frame_control))
753 754 755 756 757
			ap_sta_ps_start(dev, sta);
	}

	/* Drop data::nullfunc frames silently, since they are used only to
	 * control station power saving mode. */
758
	if (ieee80211_is_nullfunc(hdr->frame_control)) {
759 760 761 762 763
		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);
764
		return RX_QUEUED;
765 766
	}

767
	return RX_CONTINUE;
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
} /* 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)) {
784
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
785 786
		struct ieee80211_hdr *hdr =
			(struct ieee80211_hdr *) entry->skb_list.next->data;
787 788
		DECLARE_MAC_BUF(mac);
		DECLARE_MAC_BUF(mac2);
789 790
		printk(KERN_DEBUG "%s: RX reassembly removed oldest "
		       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
791
		       "addr1=%s addr2=%s\n",
792 793
		       sdata->dev->name, idx,
		       jiffies - entry->first_frag_time, entry->seq,
794 795
		       entry->last_frag, print_mac(mac, hdr->addr1),
		       print_mac(mac2, hdr->addr2));
796
#endif
797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
		__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;

843
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
844 845 846 847 848 849 850 851 852
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

853
static ieee80211_rx_result debug_noinline
854
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
855 856 857 858 859 860
{
	struct ieee80211_hdr *hdr;
	u16 sc;
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
861
	DECLARE_MAC_BUF(mac);
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879

	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,
880
						 rx->queue, &(rx->skb));
881
		if (rx->key && rx->key->conf.alg == ALG_CCMP &&
882 883 884 885 886
		    (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,
887
			       rx->key->u.ccmp.rx_pn[rx->queue],
888 889
			       CCMP_PN_LEN);
		}
890
		return RX_QUEUED;
891 892 893 894 895 896
	}

	/* 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,
897
					  rx->queue, hdr);
898 899
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
900
		return RX_DROP_MONITOR;
901 902 903 904 905 906 907
	}

	/* 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;
908
		if (!rx->key || rx->key->conf.alg != ALG_CCMP)
J
Johannes Berg 已提交
909
			return RX_DROP_UNUSABLE;
910 911 912 913 914 915
		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
916
		rpn = rx->key->u.ccmp.rx_pn[rx->queue];
917
		if (memcmp(pn, rpn, CCMP_PN_LEN))
J
Johannes Berg 已提交
918
			return RX_DROP_UNUSABLE;
919 920 921 922 923 924 925 926 927
		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;
928
		return RX_QUEUED;
929 930 931 932 933 934 935 936 937
	}

	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
938
			return RX_DROP_UNUSABLE;
939 940 941 942 943 944 945 946
		}
	}
	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 */
947
	rx->flags |= IEEE80211_RX_FRAGMENTED;
948 949 950 951 952 953 954 955

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
956
	return RX_CONTINUE;
957 958
}

959
static ieee80211_rx_result debug_noinline
960
ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
961
{
962
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
963 964
	struct sk_buff *skb;
	int no_pending_pkts;
965
	DECLARE_MAC_BUF(mac);
966 967 968 969

	if (likely(!rx->sta ||
		   (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
		   (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
970
		   !(rx->flags & IEEE80211_RX_RA_MATCH)))
971
		return RX_CONTINUE;
972

973 974
	if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
	    (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
J
Johannes Berg 已提交
975
		return RX_DROP_UNUSABLE;
976

977 978 979 980 981 982 983 984 985 986 987 988 989
	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;

990 991 992 993
		/*
		 * Tell TX path to send one frame even though the STA may
		 * still remain is PS mode after this frame exchange.
		 */
994
		set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
995 996

#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
997 998
		printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
		       print_mac(mac, rx->sta->addr), rx->sta->aid,
999 1000 1001 1002 1003
		       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 */
1004
		if (no_pending_pkts)
1005
			hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1006
		else
1007 1008 1009 1010
			hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);

		dev_queue_xmit(skb);

1011 1012
		if (no_pending_pkts)
			sta_info_clear_tim_bit(rx->sta);
1013
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1014
	} else if (!rx->sent_ps_buffered) {
1015 1016 1017 1018 1019 1020
		/*
		 * FIXME: This can be the result of a race condition between
		 *	  us expiring a frame and the station polling for it.
		 *	  Should we send it a null-func frame indicating we
		 *	  have nothing buffered for it?
		 */
1021
		printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1022
		       "though there are no buffered frames for it\n",
1023
		       rx->dev->name, print_mac(mac, rx->sta->addr));
1024 1025 1026
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
	}

1027
	/* Free PS Poll skb here instead of returning RX_DROP that would
1028 1029 1030
	 * count as an dropped frame. */
	dev_kfree_skb(rx->skb);

1031
	return RX_QUEUED;
1032 1033
}

1034
static ieee80211_rx_result debug_noinline
1035
ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1036 1037
{
	u8 *data = rx->skb->data;
1038
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1039

1040
	if (!ieee80211_is_data_qos(hdr->frame_control))
1041
		return RX_CONTINUE;
1042 1043

	/* remove the qos control field, update frame type and meta-data */
1044 1045 1046
	memmove(data + IEEE80211_QOS_CTL_LEN, data,
		ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
	hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1047
	/* change frame type to non QOS */
1048 1049
	rx->fc &= ~IEEE80211_STYPE_QOS_DATA;
	hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1050

1051
	return RX_CONTINUE;
1052 1053
}

1054
static int
1055
ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1056
{
1057
	if (unlikely(!rx->sta ||
1058
	    !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1059
		return -EACCES;
1060

1061
	return 0;
1062 1063
}

1064
static int
1065
ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1066
{
1067
	/*
1068 1069
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1070
	 */
1071
	if (rx->status->flag & RX_FLAG_DECRYPTED)
1072
		return 0;
1073 1074 1075 1076 1077

	/* 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 &&
1078
		     (rx->key || rx->sdata->drop_unencrypted)))
1079
		return -EACCES;
1080

1081
	return 0;
1082 1083
}

1084
static int
1085
ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1086 1087 1088 1089 1090 1091
{
	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];
1092
	u8 src[ETH_ALEN] __aligned(2);
1093
	struct sk_buff *skb = rx->skb;
1094
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1095 1096 1097 1098
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
	DECLARE_MAC_BUF(mac3);
	DECLARE_MAC_BUF(mac4);
1099 1100 1101 1102

	fc = rx->fc;

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1103
		return -1;
1104 1105 1106

	hdrlen = ieee80211_get_hdrlen(fc);

J
Johannes Berg 已提交
1107
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
		int meshhdrlen = ieee80211_get_mesh_hdrlen(
				(struct ieee80211s_hdr *) (skb->data + hdrlen));
		/* Copy on cb:
		 *  - mesh header: to be used for mesh forwarding
		 * decision. It will also be used as mesh header template at
		 * tx.c:ieee80211_subif_start_xmit() if interface
		 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
		 *  - ta: to be used if a RERR needs to be sent.
		 */
		memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
		memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
		hdrlen += meshhdrlen;
	}

1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	/* 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);

1138
		if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1139
			     sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1140
			return -1;
1141 1142 1143 1144 1145 1146
		break;
	case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
		/* RA TA DA SA */
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr4, ETH_ALEN);

1147
		 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1148
			     sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1149
			return -1;
1150 1151 1152 1153 1154 1155
		break;
	case IEEE80211_FCTL_FROMDS:
		/* DA BSSID SA */
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr3, ETH_ALEN);

1156
		if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1157 1158
		    (is_multicast_ether_addr(dst) &&
		     !compare_ether_addr(src, dev->dev_addr)))
1159
			return -1;
1160 1161 1162 1163 1164 1165
		break;
	case 0:
		/* DA SA BSSID */
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);

1166
		if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1167
			return -1;
1168 1169 1170
		break;
	}

1171
	if (unlikely(skb->len - hdrlen < 8))
1172
		return -1;
1173

1174
	payload = skb->data + hdrlen;
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	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;
1188

1189 1190 1191 1192 1193 1194 1195
		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;
	}
1196 1197
	return 0;
}
1198

1199 1200 1201
/*
 * requires that rx->skb is a frame with ethernet header
 */
1202
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1203
{
1204
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
		= { 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
 */
1227
static void
1228
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1229 1230 1231 1232 1233
{
	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);
1234 1235
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1236

1237 1238
	skb = rx->skb;
	xmit_skb = NULL;
1239

1240 1241
	if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
				      sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1242
	    (rx->flags & IEEE80211_RX_RA_MATCH)) {
1243 1244 1245 1246 1247
		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
			 */
1248 1249
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
			if (!xmit_skb && net_ratelimit())
1250 1251 1252 1253
				printk(KERN_DEBUG "%s: failed to clone "
				       "multicast frame\n", dev->name);
		} else {
			dsta = sta_info_get(local, skb->data);
1254
			if (dsta && dsta->sdata->dev == dev) {
1255 1256 1257 1258 1259
				/*
				 * 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.
1260
				 */
1261
				xmit_skb = skb;
1262 1263 1264 1265 1266
				skb = NULL;
			}
		}
	}

1267
	/* Mesh forwarding */
J
Johannes Berg 已提交
1268
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
1269 1270 1271 1272 1273 1274
		u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
		(*mesh_ttl)--;

		if (is_multicast_ether_addr(skb->data)) {
			if (*mesh_ttl > 0) {
				xmit_skb = skb_copy(skb, GFP_ATOMIC);
1275 1276 1277
				if (xmit_skb)
					xmit_skb->pkt_type = PACKET_OTHERHOST;
				else if (net_ratelimit())
1278 1279 1280
					printk(KERN_DEBUG "%s: failed to clone "
					       "multicast frame\n", dev->name);
			} else
J
Johannes Berg 已提交
1281 1282
				IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
							     dropped_frames_ttl);
1283 1284 1285
		} else if (skb->pkt_type != PACKET_OTHERHOST &&
			compare_ether_addr(dev->dev_addr, skb->data) != 0) {
			if (*mesh_ttl == 0) {
J
Johannes Berg 已提交
1286 1287
				IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
							     dropped_frames_ttl);
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				xmit_skb = skb;
				xmit_skb->pkt_type = PACKET_OTHERHOST;
				if (!(dev->flags & IFF_PROMISC))
					skb  = NULL;
			}
		}
	}

1299 1300 1301 1302 1303 1304 1305
	if (skb) {
		/* deliver to local stack */
		skb->protocol = eth_type_trans(skb, dev);
		memset(skb->cb, 0, sizeof(skb->cb));
		netif_rx(skb);
	}

1306
	if (xmit_skb) {
1307
		/* send to wireless media */
1308
		xmit_skb->protocol = htons(ETH_P_802_3);
1309 1310
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1311
		dev_queue_xmit(xmit_skb);
1312
	}
1313 1314
}

1315
static ieee80211_rx_result debug_noinline
1316
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
{
	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))
1331
		return RX_CONTINUE;
1332 1333

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
J
Johannes Berg 已提交
1334
		return RX_DROP_MONITOR;
1335

1336
	if (!(rx->flags & IEEE80211_RX_AMSDU))
1337
		return RX_CONTINUE;
1338 1339 1340

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1341
		return RX_DROP_UNUSABLE;
1342 1343 1344 1345 1346 1347 1348 1349 1350

	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
1351
		return RX_DROP_UNUSABLE;
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363

	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 */
1364
		if (subframe_len > remaining)
J
Johannes Berg 已提交
1365
			return RX_DROP_UNUSABLE;
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375

		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
1376
				return RX_DROP_UNUSABLE;
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386

			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) {
				dev_kfree_skb(frame);
J
Johannes Berg 已提交
1387
				return RX_DROP_UNUSABLE;
1388 1389 1390
			}
		}

1391
		skb_reset_network_header(frame);
1392 1393 1394 1395 1396 1397 1398 1399
		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 &&
1400 1401 1402
			    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
			   compare_ether_addr(payload,
					      bridge_tunnel_header) == 0)) {
1403 1404 1405 1406 1407 1408
			/* 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 {
1409 1410
			memcpy(skb_push(frame, sizeof(__be16)),
			       &len, sizeof(__be16));
1411 1412 1413 1414
			memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
			memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
		}

1415 1416
		if (!ieee80211_frame_allowed(rx)) {
			if (skb == frame) /* last frame */
J
Johannes Berg 已提交
1417
				return RX_DROP_UNUSABLE;
1418 1419 1420
			dev_kfree_skb(frame);
			continue;
		}
1421 1422 1423 1424

		ieee80211_deliver_skb(rx);
	}

1425
	return RX_QUEUED;
1426 1427
}

1428
static ieee80211_rx_result debug_noinline
1429
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1430 1431 1432
{
	struct net_device *dev = rx->dev;
	u16 fc;
1433
	int err;
1434 1435 1436

	fc = rx->fc;
	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1437
		return RX_CONTINUE;
1438 1439

	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
J
Johannes Berg 已提交
1440
		return RX_DROP_MONITOR;
1441 1442 1443

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1444
		return RX_DROP_UNUSABLE;
1445

1446
	if (!ieee80211_frame_allowed(rx))
J
Johannes Berg 已提交
1447
		return RX_DROP_MONITOR;
1448

1449 1450 1451 1452 1453 1454
	rx->skb->dev = dev;

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

	ieee80211_deliver_skb(rx);
1455

1456
	return RX_QUEUED;
1457 1458
}

1459
static ieee80211_rx_result debug_noinline
1460
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1461 1462 1463 1464
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb = rx->skb;
1465
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1466 1467 1468 1469
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

1470
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
1471
		return RX_CONTINUE;
1472

1473
	if (ieee80211_is_back_req(bar->frame_control)) {
1474
		if (!rx->sta)
1475
			return RX_CONTINUE;
1476
		tid = le16_to_cpu(bar->control) >> 12;
1477 1478
		if (rx->sta->ampdu_mlme.tid_state_rx[tid]
					!= HT_AGG_STATE_OPERATIONAL)
1479
			return RX_CONTINUE;
1480
		tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496

		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
1497
		return RX_DROP_UNUSABLE;
1498 1499
	}

1500
	return RX_CONTINUE;
1501 1502
}

1503
static ieee80211_rx_result debug_noinline
1504
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1505 1506 1507
{
	struct ieee80211_sub_if_data *sdata;

1508
	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
J
Johannes Berg 已提交
1509
		return RX_DROP_MONITOR;
1510 1511

	sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1512
	if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1513 1514
	     sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
	     sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1515
	    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1516
		ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1517
	else
J
Johannes Berg 已提交
1518
		return RX_DROP_MONITOR;
1519

1520
	return RX_QUEUED;
1521 1522 1523 1524
}

static void ieee80211_rx_michael_mic_report(struct net_device *dev,
					    struct ieee80211_hdr *hdr,
1525
					    struct ieee80211_rx_data *rx)
1526
{
1527 1528
	int keyidx;
	unsigned int hdrlen;
1529 1530
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
1531

1532
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1533 1534 1535 1536 1537
	if (rx->skb->len >= hdrlen + 4)
		keyidx = rx->skb->data[hdrlen + 3] >> 6;
	else
		keyidx = -1;

1538
	if (!rx->sta) {
1539 1540 1541 1542
		/*
		 * Some hardware seem to generate incorrect Michael MIC
		 * reports; ignore them to avoid triggering countermeasures.
		 */
1543 1544 1545
		goto ignore;
	}

1546
	if (!ieee80211_has_protected(hdr->frame_control))
1547 1548
		goto ignore;

1549
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1550 1551 1552 1553 1554 1555
		/*
		 * 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
1556
		goto ignore;
1557 1558
	}

1559 1560
	if (!ieee80211_is_data(hdr->frame_control) &&
	    !ieee80211_is_auth(hdr->frame_control))
1561 1562
		goto ignore;

J
Johannes Berg 已提交
1563
	mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1564 1565 1566 1567 1568
 ignore:
	dev_kfree_skb(rx->skb);
	rx->skb = NULL;
}

1569 1570
/* TODO: use IEEE80211_RX_FRAGMENTED */
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
{
	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;
1583
	struct ieee80211_rx_status *status = rx->status;
1584

1585
	if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
		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));

1600
	rthdr->rate = rx->rate->bitrate / 5;
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	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;

1643
	rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1644 1645 1646 1647 1648 1649
	return;

 out_free_skb:
	dev_kfree_skb(skb);
}

1650

1651
static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1652
					 struct ieee80211_rx_data *rx,
1653
					 struct sk_buff *skb)
1654 1655 1656
{
	ieee80211_rx_result res = RX_DROP_MONITOR;

1657 1658 1659 1660
	rx->skb = skb;
	rx->sdata = sdata;
	rx->dev = sdata->dev;

1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
#define CALL_RXH(rxh)		\
	res = rxh(rx);		\
	if (res != RX_CONTINUE)	\
		goto rxh_done;

	CALL_RXH(ieee80211_rx_h_passive_scan)
	CALL_RXH(ieee80211_rx_h_check)
	CALL_RXH(ieee80211_rx_h_decrypt)
	CALL_RXH(ieee80211_rx_h_sta_process)
	CALL_RXH(ieee80211_rx_h_defragment)
	CALL_RXH(ieee80211_rx_h_ps_poll)
	CALL_RXH(ieee80211_rx_h_michael_mic_verify)
	/* must be after MMIC verify so header is counted in MPDU mic */
	CALL_RXH(ieee80211_rx_h_remove_qos_control)
	CALL_RXH(ieee80211_rx_h_amsdu)
	CALL_RXH(ieee80211_rx_h_data)
	CALL_RXH(ieee80211_rx_h_ctrl)
	CALL_RXH(ieee80211_rx_h_mgmt)

#undef CALL_RXH

 rxh_done:
1683 1684
	switch (res) {
	case RX_DROP_MONITOR:
1685 1686 1687 1688 1689
		I802_DEBUG_INC(sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		/* fall through */
	case RX_CONTINUE:
1690 1691
		ieee80211_rx_cooked_monitor(rx);
		break;
1692
	case RX_DROP_UNUSABLE:
1693 1694 1695
		I802_DEBUG_INC(sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
1696 1697
		dev_kfree_skb(rx->skb);
		break;
1698 1699 1700
	case RX_QUEUED:
		I802_DEBUG_INC(sdata->local->rx_handlers_queued);
		break;
1701 1702 1703
	}
}

1704 1705
/* main receive path */

1706
static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1707
				u8 *bssid, struct ieee80211_rx_data *rx,
1708 1709 1710 1711
				struct ieee80211_hdr *hdr)
{
	int multicast = is_multicast_ether_addr(hdr->addr1);

1712
	switch (sdata->vif.type) {
1713 1714 1715 1716
	case IEEE80211_IF_TYPE_STA:
		if (!bssid)
			return 0;
		if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1717
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1718
				return 0;
1719
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1720 1721 1722
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1723
			if (!(sdata->dev->flags & IFF_PROMISC))
1724
				return 0;
1725
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1726 1727 1728 1729 1730
		}
		break;
	case IEEE80211_IF_TYPE_IBSS:
		if (!bssid)
			return 0;
1731
		if (ieee80211_is_beacon(hdr->frame_control)) {
1732 1733 1734 1735
			if (!rx->sta)
				rx->sta = ieee80211_ibss_add_sta(sdata->dev,
						rx->skb, bssid, hdr->addr2,
						BIT(rx->status->rate_idx));
B
Bruno Randolf 已提交
1736
			return 1;
1737
		}
B
Bruno Randolf 已提交
1738
		else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1739
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1740
				return 0;
1741
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1742 1743 1744
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1745
			if (!(sdata->dev->flags & IFF_PROMISC))
1746
				return 0;
1747
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1748 1749
		} else if (!rx->sta)
			rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1750 1751
						bssid, hdr->addr2,
						BIT(rx->status->rate_idx));
1752
		break;
1753 1754 1755 1756 1757 1758 1759
	case IEEE80211_IF_TYPE_MESH_POINT:
		if (!multicast &&
		    compare_ether_addr(sdata->dev->dev_addr,
				       hdr->addr1) != 0) {
			if (!(sdata->dev->flags & IFF_PROMISC))
				return 0;

1760
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1761 1762
		}
		break;
J
Johannes Berg 已提交
1763
	case IEEE80211_IF_TYPE_VLAN:
1764 1765 1766 1767 1768 1769 1770
	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)) {
1771
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1772
				return 0;
1773
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1774
		}
1775
		if (sdata->dev == sdata->local->mdev &&
1776
		    !(rx->flags & IEEE80211_RX_IN_SCAN))
1777 1778 1779 1780 1781
			/* do not receive anything via
			 * master device when not scanning */
			return 0;
		break;
	case IEEE80211_IF_TYPE_WDS:
1782
		if (bssid || !ieee80211_is_data(hdr->frame_control))
1783 1784 1785 1786
			return 0;
		if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
			return 0;
		break;
J
Johannes Berg 已提交
1787 1788 1789
	case IEEE80211_IF_TYPE_MNTR:
		/* take everything */
		break;
1790
	case IEEE80211_IF_TYPE_INVALID:
J
Johannes Berg 已提交
1791 1792 1793
		/* should never get here */
		WARN_ON(1);
		break;
1794 1795 1796 1797 1798
	}

	return 1;
}

1799
/*
1800 1801
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
1802
 */
1803 1804 1805
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
					 struct sk_buff *skb,
					 struct ieee80211_rx_status *status,
1806
					 struct ieee80211_rate *rate)
1807 1808 1809 1810
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
1811
	struct ieee80211_rx_data rx;
1812
	u16 type;
1813
	int prepares;
J
Johannes Berg 已提交
1814 1815 1816
	struct ieee80211_sub_if_data *prev = NULL;
	struct sk_buff *skb_new;
	u8 *bssid;
1817 1818 1819 1820 1821 1822

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

1823 1824
	rx.status = status;
	rx.rate = rate;
1825
	rx.fc = le16_to_cpu(hdr->frame_control);
1826
	type = rx.fc & IEEE80211_FCTL_FTYPE;
1827

1828
	if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1829 1830
		local->dot11ReceivedFragmentCount++;

1831 1832
	rx.sta = sta_info_get(local, hdr->addr2);
	if (rx.sta) {
1833 1834
		rx.sdata = rx.sta->sdata;
		rx.dev = rx.sta->sdata->dev;
1835
	}
1836 1837

	if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1838
		ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1839
		return;
1840 1841
	}

Z
Zhu Yi 已提交
1842
	if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1843
		rx.flags |= IEEE80211_RX_IN_SCAN;
1844

1845 1846 1847
	ieee80211_parse_qos(&rx);
	ieee80211_verify_ip_alignment(&rx);

1848 1849
	skb = rx.skb;

1850
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1851 1852 1853
		if (!netif_running(sdata->dev))
			continue;

1854
		if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1855 1856
			continue;

1857
		bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1858
		rx.flags |= IEEE80211_RX_RA_MATCH;
1859
		prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1860

1861
		if (!prepares)
1862
			continue;
J
Johannes Berg 已提交
1863

J
Johannes Berg 已提交
1864 1865 1866 1867 1868 1869 1870 1871 1872
		/*
		 * 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
1873
		}
J
Johannes Berg 已提交
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883

		/*
		 * 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 "
1884
				       "multicast frame for %s\n",
1885 1886
				       wiphy_name(local->hw.wiphy),
				       prev->dev->name);
J
Johannes Berg 已提交
1887 1888
			continue;
		}
1889
		rx.fc = le16_to_cpu(hdr->frame_control);
1890
		ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
J
Johannes Berg 已提交
1891
		prev = sdata;
1892
	}
J
Johannes Berg 已提交
1893
	if (prev) {
1894
		rx.fc = le16_to_cpu(hdr->frame_control);
1895
		ieee80211_invoke_rx_handlers(prev, &rx, skb);
J
Johannes Berg 已提交
1896 1897
	} else
		dev_kfree_skb(skb);
1898
}
1899

1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
#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);
}


1919 1920 1921 1922
/*
 * As it function blongs to Rx path it must be called with
 * the proper rcu_read_lock protection for its flow.
 */
1923 1924 1925 1926 1927 1928 1929 1930 1931
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;
1932 1933
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
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

	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));
1964 1965
				sband = local->hw.wiphy->bands[status.band];
				rate = &sband->bitrates[status.rate_idx];
1966 1967
				__ieee80211_rx_handle_packet(hw,
					tid_agg_rx->reorder_buf[index],
1968
					&status, rate);
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
				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));
2008 2009
		sband = local->hw.wiphy->bands[status.band];
		rate = &sband->bitrates[status.rate_idx];
2010
		__ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2011
					     &status, rate);
2012 2013 2014 2015 2016 2017 2018 2019 2020
		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;
}

2021 2022
static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
				     struct sk_buff *skb)
2023 2024 2025 2026 2027
{
	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;
H
Harvey Harrison 已提交
2028
	u16 sc;
2029
	u16 mpdu_seq_num;
2030
	u8 ret = 0;
2031 2032 2033 2034 2035 2036 2037 2038
	int tid;

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

	/* filter the QoS data rx stream according to
	 * STA/TID and check if this STA/TID is on aggregation */
H
Harvey Harrison 已提交
2039
	if (!ieee80211_is_data_qos(hdr->frame_control))
2040 2041
		goto end_reorder;

2042
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2043

2044
	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2045 2046
		goto end_reorder;

2047 2048
	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

2049
	/* null data frames are excluded */
H
Harvey Harrison 已提交
2050
	if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
		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) {
2065
		ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2066 2067 2068 2069 2070 2071 2072 2073 2074
			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);
2075
 end_reorder:
2076 2077 2078
	return ret;
}

2079 2080 2081 2082 2083 2084 2085 2086
/*
 * 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);
2087 2088 2089 2090
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;

	if (status->band < 0 ||
A
Adrian Bunk 已提交
2091
	    status->band >= IEEE80211_NUM_BANDS) {
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
		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];
2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119

	/*
	 * 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.
	 */
2120
	skb = ieee80211_rx_monitor(local, skb, status, rate);
2121 2122 2123 2124 2125
	if (!skb) {
		rcu_read_unlock();
		return;
	}

2126
	if (!ieee80211_rx_reorder_ampdu(local, skb))
2127
		__ieee80211_rx_handle_packet(hw, skb, status, rate);
2128 2129 2130

	rcu_read_unlock();
}
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
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);