rx.c 60.5 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;
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	if (status->flag & RX_FLAG_SHORTPRE)
		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
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	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);
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	else if (rate->flags & IEEE80211_RATE_ERP_G)
		*(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
					     IEEE80211_CHAN_2GHZ);
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	else
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		*(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
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					     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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		/*
		 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
		 *
		 *	Sequence numbers for management frames, QoS data
		 *	frames with a broadcast/multicast address in the
		 *	Address 1 field, and all non-QoS data frames sent
		 *	by QoS STAs are assigned using an additional single
		 *	modulo-4096 counter, [...]
		 *
		 * We also use that counter for non-QoS STAs.
		 */
		tid = NUM_RX_DATA_QUEUES - 1;
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	}
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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->sdata, 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->sdata, 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) &&
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	    mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
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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?
		 */
593 594
		if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
		    (rx->status->flag & RX_FLAG_IV_STRIPPED))
595
			return RX_CONTINUE;
596

597
		hdrlen = ieee80211_hdrlen(hdr->frame_control);
598 599

		if (rx->skb->len < 8 + hdrlen)
J
Johannes Berg 已提交
600
			return RX_DROP_UNUSABLE; /* TODO: count this? */
601 602 603 604 605 606 607

		/*
		 * 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;

608
		rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
609 610 611 612 613 614

		/*
		 * 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.
		 */
615
		if (rx->key && rx->key->conf.alg != ALG_WEP &&
616 617
		    !is_multicast_ether_addr(hdr->addr1))
			rx->key = NULL;
618 619
	}

620
	if (rx->key) {
621
		rx->key->tx_rx_count++;
622
		/* TODO: add threshold stuff again */
623
	} else {
J
Johannes Berg 已提交
624
		return RX_DROP_MONITOR;
625 626
	}

627 628
	/* Check for weak IVs if possible */
	if (rx->sta && rx->key->conf.alg == ALG_WEP &&
629
	    ieee80211_is_data(hdr->frame_control) &&
630 631
	    (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
	     !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
632 633 634
	    ieee80211_wep_is_weak_iv(rx->skb, rx->key))
		rx->sta->wep_weak_iv_count++;

635 636
	switch (rx->key->conf.alg) {
	case ALG_WEP:
637 638
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
639
	case ALG_TKIP:
640 641
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
642
	case ALG_CCMP:
643 644
		result = ieee80211_crypto_ccmp_decrypt(rx);
		break;
645 646
	}

647
	/* either the frame has been decrypted or will be dropped */
648
	rx->status->flag |= RX_FLAG_DECRYPTED;
649 650

	return result;
651 652
}

653 654 655
static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
656 657
	DECLARE_MAC_BUF(mac);

658
	sdata = sta->sdata;
659

660
	atomic_inc(&sdata->bss->num_sta_ps);
661
	set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
662
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
663 664
	printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
665 666 667 668 669 670 671 672 673
#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;
674
	struct ieee80211_tx_info *info;
675
	DECLARE_MAC_BUF(mac);
676

677
	sdata = sta->sdata;
678

679
	atomic_dec(&sdata->bss->num_sta_ps);
680

681
	clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
682 683 684 685

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

686
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
687 688
	printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
689
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
690

691 692
	/* Send all buffered frames to the station */
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
693
		info = IEEE80211_SKB_CB(skb);
694
		sent++;
695
		info->flags |= IEEE80211_TX_CTL_REQUEUE;
696 697 698
		dev_queue_xmit(skb);
	}
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
699
		info = IEEE80211_SKB_CB(skb);
700 701 702
		local->total_ps_buffered--;
		sent++;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
703
		printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
704
		       "since STA not sleeping anymore\n", dev->name,
705
		       print_mac(mac, sta->addr), sta->aid);
706
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
707
		info->flags |= IEEE80211_TX_CTL_REQUEUE;
708 709 710 711 712 713
		dev_queue_xmit(skb);
	}

	return sent;
}

714
static ieee80211_rx_result debug_noinline
715
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
716 717 718
{
	struct sta_info *sta = rx->sta;
	struct net_device *dev = rx->dev;
719
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
720 721

	if (!sta)
722
		return RX_CONTINUE;
723 724 725 726

	/* 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. */
727
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
728 729
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
						IEEE80211_IF_TYPE_IBSS);
730 731 732 733
		if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
			sta->last_rx = jiffies;
	} else
	if (!is_multicast_ether_addr(hdr->addr1) ||
734
	    rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
735 736 737
		/* 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.
738 739
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
740 741 742 743
		 */
		sta->last_rx = jiffies;
	}

744
	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
745
		return RX_CONTINUE;
746 747 748

	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
749
	sta->last_signal = rx->status->signal;
750
	sta->last_qual = rx->status->qual;
751
	sta->last_noise = rx->status->noise;
752

753 754 755
	if (!ieee80211_has_morefrags(hdr->frame_control) &&
	    (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
	     rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
756 757
		/* Change STA power saving mode only in the end of a frame
		 * exchange sequence */
758
		if (test_sta_flags(sta, WLAN_STA_PS) &&
759
		    !ieee80211_has_pm(hdr->frame_control))
760
			rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
761
		else if (!test_sta_flags(sta, WLAN_STA_PS) &&
762
			 ieee80211_has_pm(hdr->frame_control))
763 764 765 766 767
			ap_sta_ps_start(dev, sta);
	}

	/* Drop data::nullfunc frames silently, since they are used only to
	 * control station power saving mode. */
768
	if (ieee80211_is_nullfunc(hdr->frame_control)) {
769 770 771 772 773
		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);
774
		return RX_QUEUED;
775 776
	}

777
	return RX_CONTINUE;
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
} /* 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)) {
794
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
795 796
		struct ieee80211_hdr *hdr =
			(struct ieee80211_hdr *) entry->skb_list.next->data;
797 798
		DECLARE_MAC_BUF(mac);
		DECLARE_MAC_BUF(mac2);
799 800
		printk(KERN_DEBUG "%s: RX reassembly removed oldest "
		       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
801
		       "addr1=%s addr2=%s\n",
802 803
		       sdata->dev->name, idx,
		       jiffies - entry->first_frag_time, entry->seq,
804 805
		       entry->last_frag, print_mac(mac, hdr->addr1),
		       print_mac(mac2, hdr->addr2));
806
#endif
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
		__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,
824
			  unsigned int frag, unsigned int seq,
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
			  int rx_queue, struct ieee80211_hdr *hdr)
{
	struct ieee80211_fragment_entry *entry;
	int i, idx;

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

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

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

844
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
845

846 847 848 849 850
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
851 852 853 854
		    compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
		    compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
			continue;

855
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
856 857 858 859 860 861 862 863 864
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

865
static ieee80211_rx_result debug_noinline
866
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
867 868 869
{
	struct ieee80211_hdr *hdr;
	u16 sc;
870
	__le16 fc;
871 872 873
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
874
	DECLARE_MAC_BUF(mac);
875

876
	hdr = (struct ieee80211_hdr *)rx->skb->data;
877
	fc = hdr->frame_control;
878 879 880
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

881
	if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
882 883 884 885 886 887 888 889 890 891 892 893
		   (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,
894
						 rx->queue, &(rx->skb));
895
		if (rx->key && rx->key->conf.alg == ALG_CCMP &&
896
		    ieee80211_has_protected(fc)) {
897 898 899 900
			/* Store CCMP PN so that we can verify that the next
			 * fragment has a sequential PN value. */
			entry->ccmp = 1;
			memcpy(entry->last_pn,
901
			       rx->key->u.ccmp.rx_pn[rx->queue],
902 903
			       CCMP_PN_LEN);
		}
904
		return RX_QUEUED;
905 906 907 908 909
	}

	/* 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.
	 */
910
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
911 912
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
913
		return RX_DROP_MONITOR;
914 915 916 917 918 919 920
	}

	/* 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;
921
		if (!rx->key || rx->key->conf.alg != ALG_CCMP)
J
Johannes Berg 已提交
922
			return RX_DROP_UNUSABLE;
923 924 925 926 927 928
		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
929
		rpn = rx->key->u.ccmp.rx_pn[rx->queue];
930
		if (memcmp(pn, rpn, CCMP_PN_LEN))
J
Johannes Berg 已提交
931
			return RX_DROP_UNUSABLE;
932 933 934
		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
	}

935
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
936 937 938
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
939
	if (ieee80211_has_morefrags(fc)) {
940
		rx->skb = NULL;
941
		return RX_QUEUED;
942 943 944 945 946 947 948 949 950
	}

	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
951
			return RX_DROP_UNUSABLE;
952 953 954 955 956 957 958 959
		}
	}
	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 */
960
	rx->flags |= IEEE80211_RX_FRAGMENTED;
961 962 963 964 965 966 967 968

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
969
	return RX_CONTINUE;
970 971
}

972
static ieee80211_rx_result debug_noinline
973
ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
974
{
975
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
976 977
	struct sk_buff *skb;
	int no_pending_pkts;
978
	DECLARE_MAC_BUF(mac);
979
	__le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
980

981
	if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
982
		   !(rx->flags & IEEE80211_RX_RA_MATCH)))
983
		return RX_CONTINUE;
984

985 986
	if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
	    (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
J
Johannes Berg 已提交
987
		return RX_DROP_UNUSABLE;
988

989 990 991 992 993 994 995 996 997 998 999 1000 1001
	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;

1002 1003 1004 1005
		/*
		 * Tell TX path to send one frame even though the STA may
		 * still remain is PS mode after this frame exchange.
		 */
1006
		set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1007 1008

#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1009 1010
		printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
		       print_mac(mac, rx->sta->addr), rx->sta->aid,
1011 1012 1013 1014 1015
		       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 */
1016
		if (no_pending_pkts)
1017
			hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1018
		else
1019 1020 1021 1022
			hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);

		dev_queue_xmit(skb);

1023 1024
		if (no_pending_pkts)
			sta_info_clear_tim_bit(rx->sta);
1025
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1026
	} else if (!rx->sent_ps_buffered) {
1027 1028 1029 1030 1031 1032
		/*
		 * 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?
		 */
1033
		printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1034
		       "though there are no buffered frames for it\n",
1035
		       rx->dev->name, print_mac(mac, rx->sta->addr));
1036 1037 1038
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
	}

1039
	/* Free PS Poll skb here instead of returning RX_DROP that would
1040 1041 1042
	 * count as an dropped frame. */
	dev_kfree_skb(rx->skb);

1043
	return RX_QUEUED;
1044 1045
}

1046
static ieee80211_rx_result debug_noinline
1047
ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1048 1049
{
	u8 *data = rx->skb->data;
1050
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1051

1052
	if (!ieee80211_is_data_qos(hdr->frame_control))
1053
		return RX_CONTINUE;
1054 1055

	/* remove the qos control field, update frame type and meta-data */
1056 1057 1058
	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);
1059
	/* change frame type to non QOS */
1060
	hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1061

1062
	return RX_CONTINUE;
1063 1064
}

1065
static int
1066
ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1067
{
1068
	if (unlikely(!rx->sta ||
1069
	    !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1070
		return -EACCES;
1071

1072
	return 0;
1073 1074
}

1075
static int
1076
ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1077
{
1078
	/*
1079 1080
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1081
	 */
1082
	if (rx->status->flag & RX_FLAG_DECRYPTED)
1083
		return 0;
1084 1085

	/* Drop unencrypted frames if key is set. */
1086 1087
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
1088
		     (rx->key || rx->sdata->drop_unencrypted)))
1089
		return -EACCES;
1090

1091
	return 0;
1092 1093
}

1094
static int
1095
ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1096 1097 1098
{
	struct net_device *dev = rx->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1099
	u16 hdrlen, ethertype;
1100 1101
	u8 *payload;
	u8 dst[ETH_ALEN];
1102
	u8 src[ETH_ALEN] __aligned(2);
1103
	struct sk_buff *skb = rx->skb;
1104
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1105 1106 1107 1108
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
	DECLARE_MAC_BUF(mac3);
	DECLARE_MAC_BUF(mac4);
1109

1110
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1111
		return -1;
1112

1113
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1114

1115 1116
	if (ieee80211_vif_is_mesh(&sdata->vif))
		hdrlen += ieee80211_get_mesh_hdrlen(
1117 1118
				(struct ieee80211s_hdr *) (skb->data + hdrlen));

1119 1120 1121 1122 1123 1124 1125 1126 1127
	/* 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
	 */
1128 1129
	memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
	memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1130

1131 1132 1133
	switch (hdr->frame_control &
		cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
	case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
1134
		if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1135
			     sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1136
			return -1;
1137
		break;
1138 1139
	case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
		if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1140
			     sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1141
			return -1;
1142
		break;
1143
	case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
1144
		if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1145 1146
		    (is_multicast_ether_addr(dst) &&
		     !compare_ether_addr(src, dev->dev_addr)))
1147
			return -1;
1148
		break;
1149
	case __constant_cpu_to_le16(0):
1150
		if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1151
			return -1;
1152 1153 1154
		break;
	}

1155
	if (unlikely(skb->len - hdrlen < 8))
1156
		return -1;
1157

1158
	payload = skb->data + hdrlen;
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
	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;
1172

1173 1174 1175 1176 1177 1178 1179
		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;
	}
1180 1181
	return 0;
}
1182

1183 1184 1185
/*
 * requires that rx->skb is a frame with ethernet header
 */
1186
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1187
{
1188
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
		= { 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) ||
1202
	    ieee80211_drop_unencrypted(rx, fc))
1203 1204 1205 1206 1207 1208 1209 1210
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
1211
static void
1212
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1213 1214 1215 1216 1217
{
	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);
1218 1219
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
1220

1221 1222
	skb = rx->skb;
	xmit_skb = NULL;
1223

1224 1225
	if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
				      sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1226
	    (rx->flags & IEEE80211_RX_RA_MATCH)) {
1227 1228 1229 1230 1231
		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
			 */
1232 1233
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
			if (!xmit_skb && net_ratelimit())
1234 1235 1236 1237
				printk(KERN_DEBUG "%s: failed to clone "
				       "multicast frame\n", dev->name);
		} else {
			dsta = sta_info_get(local, skb->data);
1238
			if (dsta && dsta->sdata->dev == dev) {
1239 1240 1241 1242 1243
				/*
				 * 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.
1244
				 */
1245
				xmit_skb = skb;
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
				skb = NULL;
			}
		}
	}

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

1258
	if (xmit_skb) {
1259
		/* send to wireless media */
1260
		xmit_skb->protocol = htons(ETH_P_802_3);
1261 1262
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
1263
		dev_queue_xmit(xmit_skb);
1264
	}
1265 1266
}

1267
static ieee80211_rx_result debug_noinline
1268
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1269 1270 1271
{
	struct net_device *dev = rx->dev;
	struct ieee80211_local *local = rx->local;
1272
	u16 ethertype;
1273 1274
	u8 *payload;
	struct sk_buff *skb = rx->skb, *frame = NULL;
1275 1276
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
1277 1278 1279 1280 1281 1282
	const struct ethhdr *eth;
	int remaining, err;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	DECLARE_MAC_BUF(mac);

1283
	if (unlikely(!ieee80211_is_data(fc)))
1284
		return RX_CONTINUE;
1285

1286
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
1287
		return RX_DROP_MONITOR;
1288

1289
	if (!(rx->flags & IEEE80211_RX_AMSDU))
1290
		return RX_CONTINUE;
1291 1292 1293

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1294
		return RX_DROP_UNUSABLE;
1295 1296 1297 1298 1299 1300 1301 1302 1303

	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
1304
		return RX_DROP_UNUSABLE;
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316

	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 */
1317
		if (subframe_len > remaining)
J
Johannes Berg 已提交
1318
			return RX_DROP_UNUSABLE;
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328

		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
1329
				return RX_DROP_UNUSABLE;
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339

			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
1340
				return RX_DROP_UNUSABLE;
1341 1342 1343
			}
		}

1344
		skb_reset_network_header(frame);
1345 1346 1347 1348 1349 1350 1351 1352
		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 &&
1353 1354 1355
			    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
			   compare_ether_addr(payload,
					      bridge_tunnel_header) == 0)) {
1356 1357 1358 1359 1360 1361
			/* 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 {
1362 1363
			memcpy(skb_push(frame, sizeof(__be16)),
			       &len, sizeof(__be16));
1364 1365 1366 1367
			memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
			memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
		}

1368
		if (!ieee80211_frame_allowed(rx, fc)) {
1369
			if (skb == frame) /* last frame */
J
Johannes Berg 已提交
1370
				return RX_DROP_UNUSABLE;
1371 1372 1373
			dev_kfree_skb(frame);
			continue;
		}
1374 1375 1376 1377

		ieee80211_deliver_skb(rx);
	}

1378
	return RX_QUEUED;
1379 1380
}

1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr;
	struct ieee80211s_hdr *mesh_hdr;
	unsigned int hdrlen;
	struct sk_buff *skb = rx->skb, *fwd_skb;

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

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

	if (!mesh_hdr->ttl)
		/* illegal frame */
		return RX_DROP_MONITOR;

	if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
		return RX_CONTINUE;

	mesh_hdr->ttl--;

	if (rx->flags & IEEE80211_RX_RA_MATCH) {
		if (!mesh_hdr->ttl)
			IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta,
						     dropped_frames_ttl);
		else {
			struct ieee80211_hdr *fwd_hdr;
			fwd_skb = skb_copy(skb, GFP_ATOMIC);

			if (!fwd_skb && net_ratelimit())
				printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
						   rx->dev->name);

			fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
			/*
			 * Save TA to addr1 to send TA a path error if a
			 * suitable next hop is not found
			 */
			memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
			memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
			fwd_skb->dev = rx->local->mdev;
			fwd_skb->iif = rx->dev->ifindex;
			dev_queue_xmit(fwd_skb);
		}
	}

	if (is_multicast_ether_addr(hdr->addr3) ||
	    rx->dev->flags & IFF_PROMISC)
		return RX_CONTINUE;
	else
		return RX_DROP_MONITOR;
}


1438
static ieee80211_rx_result debug_noinline
1439
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1440 1441
{
	struct net_device *dev = rx->dev;
1442 1443
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
1444
	int err;
1445

1446
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1447
		return RX_CONTINUE;
1448

1449
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
1450
		return RX_DROP_MONITOR;
1451 1452 1453

	err = ieee80211_data_to_8023(rx);
	if (unlikely(err))
J
Johannes Berg 已提交
1454
		return RX_DROP_UNUSABLE;
1455

1456
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
1457
		return RX_DROP_MONITOR;
1458

1459 1460 1461 1462 1463 1464
	rx->skb->dev = dev;

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

	ieee80211_deliver_skb(rx);
1465

1466
	return RX_QUEUED;
1467 1468
}

1469
static ieee80211_rx_result debug_noinline
1470
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1471 1472 1473 1474
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb = rx->skb;
1475
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1476 1477 1478 1479
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

1480
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
1481
		return RX_CONTINUE;
1482

1483
	if (ieee80211_is_back_req(bar->frame_control)) {
1484
		if (!rx->sta)
1485
			return RX_CONTINUE;
1486
		tid = le16_to_cpu(bar->control) >> 12;
1487 1488
		if (rx->sta->ampdu_mlme.tid_state_rx[tid]
					!= HT_AGG_STATE_OPERATIONAL)
1489
			return RX_CONTINUE;
1490
		tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506

		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
1507
		return RX_DROP_UNUSABLE;
1508 1509
	}

1510
	return RX_CONTINUE;
1511 1512
}

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 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
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
	int len = rx->skb->len;

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

	if (!rx->sta)
		return RX_DROP_MONITOR;

	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
		return RX_DROP_MONITOR;

	/* all categories we currently handle have action_code */
	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
		return RX_DROP_MONITOR;

	/*
	 * FIXME: revisit this, I'm sure we should handle most
	 *	  of these frames in other modes as well!
	 */
	if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
	    sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
		return RX_DROP_MONITOR;

	switch (mgmt->u.action.category) {
	case WLAN_CATEGORY_BACK:
		switch (mgmt->u.action.u.addba_req.action_code) {
		case WLAN_ACTION_ADDBA_REQ:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_req)))
				return RX_DROP_MONITOR;
			ieee80211_process_addba_request(local, rx->sta, mgmt, len);
			break;
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
				return RX_DROP_MONITOR;
			ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
			break;
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
				return RX_DROP_MONITOR;
			ieee80211_process_delba(sdata, rx->sta, mgmt, len);
			break;
		}
		rx->sta->rx_packets++;
		dev_kfree_skb(rx->skb);
		return RX_QUEUED;
	}

	return RX_CONTINUE;
}

1572
static ieee80211_rx_result debug_noinline
1573
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1574 1575 1576
{
	struct ieee80211_sub_if_data *sdata;

1577
	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
J
Johannes Berg 已提交
1578
		return RX_DROP_MONITOR;
1579 1580

	sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1581
	if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1582 1583
	     sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
	     sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1584
	    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1585
		ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1586
	else
J
Johannes Berg 已提交
1587
		return RX_DROP_MONITOR;
1588

1589
	return RX_QUEUED;
1590 1591 1592 1593
}

static void ieee80211_rx_michael_mic_report(struct net_device *dev,
					    struct ieee80211_hdr *hdr,
1594
					    struct ieee80211_rx_data *rx)
1595
{
1596 1597
	int keyidx;
	unsigned int hdrlen;
1598 1599
	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
1600

1601
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1602 1603 1604 1605 1606
	if (rx->skb->len >= hdrlen + 4)
		keyidx = rx->skb->data[hdrlen + 3] >> 6;
	else
		keyidx = -1;

1607
	if (!rx->sta) {
1608 1609 1610 1611
		/*
		 * Some hardware seem to generate incorrect Michael MIC
		 * reports; ignore them to avoid triggering countermeasures.
		 */
1612 1613 1614
		goto ignore;
	}

1615
	if (!ieee80211_has_protected(hdr->frame_control))
1616 1617
		goto ignore;

1618
	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1619 1620 1621 1622 1623 1624
		/*
		 * 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
1625
		goto ignore;
1626 1627
	}

1628 1629
	if (!ieee80211_is_data(hdr->frame_control) &&
	    !ieee80211_is_auth(hdr->frame_control))
1630 1631
		goto ignore;

1632
	mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1633 1634 1635 1636 1637
 ignore:
	dev_kfree_skb(rx->skb);
	rx->skb = NULL;
}

1638 1639
/* TODO: use IEEE80211_RX_FRAGMENTED */
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
{
	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;
1652
	struct ieee80211_rx_status *status = rx->status;
1653

1654
	if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668
		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));

1669
	rthdr->rate = rx->rate->bitrate / 5;
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
	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;

1712
	rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1713 1714 1715 1716 1717 1718
	return;

 out_free_skb:
	dev_kfree_skb(skb);
}

1719

1720
static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1721
					 struct ieee80211_rx_data *rx,
1722
					 struct sk_buff *skb)
1723 1724 1725
{
	ieee80211_rx_result res = RX_DROP_MONITOR;

1726 1727 1728 1729
	rx->skb = skb;
	rx->sdata = sdata;
	rx->dev = sdata->dev;

1730 1731 1732 1733 1734 1735
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_done;  \
	} while (0);
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746

	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)
1747 1748
	if (ieee80211_vif_is_mesh(&sdata->vif))
		CALL_RXH(ieee80211_rx_h_mesh_fwding);
1749 1750
	CALL_RXH(ieee80211_rx_h_data)
	CALL_RXH(ieee80211_rx_h_ctrl)
1751
	CALL_RXH(ieee80211_rx_h_action)
1752 1753 1754 1755 1756
	CALL_RXH(ieee80211_rx_h_mgmt)

#undef CALL_RXH

 rxh_done:
1757 1758
	switch (res) {
	case RX_DROP_MONITOR:
1759 1760 1761 1762 1763
		I802_DEBUG_INC(sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
		/* fall through */
	case RX_CONTINUE:
1764 1765
		ieee80211_rx_cooked_monitor(rx);
		break;
1766
	case RX_DROP_UNUSABLE:
1767 1768 1769
		I802_DEBUG_INC(sdata->local->rx_handlers_drop);
		if (rx->sta)
			rx->sta->rx_dropped++;
1770 1771
		dev_kfree_skb(rx->skb);
		break;
1772 1773 1774
	case RX_QUEUED:
		I802_DEBUG_INC(sdata->local->rx_handlers_queued);
		break;
1775 1776 1777
	}
}

1778 1779
/* main receive path */

1780
static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1781
				u8 *bssid, struct ieee80211_rx_data *rx,
1782 1783 1784 1785
				struct ieee80211_hdr *hdr)
{
	int multicast = is_multicast_ether_addr(hdr->addr1);

1786
	switch (sdata->vif.type) {
1787 1788 1789 1790
	case IEEE80211_IF_TYPE_STA:
		if (!bssid)
			return 0;
		if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1791
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1792
				return 0;
1793
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1794 1795 1796
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1797
			if (!(sdata->dev->flags & IFF_PROMISC))
1798
				return 0;
1799
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1800 1801 1802 1803 1804
		}
		break;
	case IEEE80211_IF_TYPE_IBSS:
		if (!bssid)
			return 0;
1805
		if (ieee80211_is_beacon(hdr->frame_control)) {
B
Bruno Randolf 已提交
1806
			return 1;
1807
		}
B
Bruno Randolf 已提交
1808
		else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1809
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1810
				return 0;
1811
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1812 1813 1814
		} else if (!multicast &&
			   compare_ether_addr(sdata->dev->dev_addr,
					      hdr->addr1) != 0) {
1815
			if (!(sdata->dev->flags & IFF_PROMISC))
1816
				return 0;
1817
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1818
		} else if (!rx->sta)
1819
			rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
1820 1821
						bssid, hdr->addr2,
						BIT(rx->status->rate_idx));
1822
		break;
1823 1824 1825 1826 1827 1828 1829
	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;

1830
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1831 1832
		}
		break;
J
Johannes Berg 已提交
1833
	case IEEE80211_IF_TYPE_VLAN:
1834 1835 1836 1837 1838 1839 1840
	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)) {
1841
			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1842
				return 0;
1843
			rx->flags &= ~IEEE80211_RX_RA_MATCH;
1844 1845 1846
		}
		break;
	case IEEE80211_IF_TYPE_WDS:
1847
		if (bssid || !ieee80211_is_data(hdr->frame_control))
1848 1849 1850 1851
			return 0;
		if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
			return 0;
		break;
J
Johannes Berg 已提交
1852 1853 1854
	case IEEE80211_IF_TYPE_MNTR:
		/* take everything */
		break;
1855
	case IEEE80211_IF_TYPE_INVALID:
J
Johannes Berg 已提交
1856 1857 1858
		/* should never get here */
		WARN_ON(1);
		break;
1859 1860 1861 1862 1863
	}

	return 1;
}

1864
/*
1865 1866
 * This is the actual Rx frames handler. as it blongs to Rx path it must
 * be called with rcu_read_lock protection.
1867
 */
1868 1869 1870
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
					 struct sk_buff *skb,
					 struct ieee80211_rx_status *status,
1871
					 struct ieee80211_rate *rate)
1872 1873 1874 1875
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
1876
	struct ieee80211_rx_data rx;
1877
	int prepares;
J
Johannes Berg 已提交
1878 1879 1880
	struct ieee80211_sub_if_data *prev = NULL;
	struct sk_buff *skb_new;
	u8 *bssid;
1881

1882
	hdr = (struct ieee80211_hdr *)skb->data;
1883 1884 1885 1886
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;

1887 1888
	rx.status = status;
	rx.rate = rate;
1889

1890
	if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
1891 1892
		local->dot11ReceivedFragmentCount++;

1893 1894
	rx.sta = sta_info_get(local, hdr->addr2);
	if (rx.sta) {
1895 1896
		rx.sdata = rx.sta->sdata;
		rx.dev = rx.sta->sdata->dev;
1897
	}
1898 1899

	if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1900
		ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1901
		return;
1902 1903
	}

Z
Zhu Yi 已提交
1904
	if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1905
		rx.flags |= IEEE80211_RX_IN_SCAN;
1906

1907 1908 1909
	ieee80211_parse_qos(&rx);
	ieee80211_verify_ip_alignment(&rx);

1910 1911
	skb = rx.skb;

1912
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1913 1914 1915
		if (!netif_running(sdata->dev))
			continue;

1916
		if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1917 1918
			continue;

1919
		bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1920
		rx.flags |= IEEE80211_RX_RA_MATCH;
1921
		prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1922

1923
		if (!prepares)
1924
			continue;
J
Johannes Berg 已提交
1925

J
Johannes Berg 已提交
1926 1927 1928 1929 1930 1931 1932 1933 1934
		/*
		 * 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
1935
		}
J
Johannes Berg 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945

		/*
		 * 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 "
1946
				       "multicast frame for %s\n",
1947 1948
				       wiphy_name(local->hw.wiphy),
				       prev->dev->name);
J
Johannes Berg 已提交
1949 1950
			continue;
		}
1951
		ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
J
Johannes Berg 已提交
1952
		prev = sdata;
1953
	}
1954
	if (prev)
1955
		ieee80211_invoke_rx_handlers(prev, &rx, skb);
1956
	else
J
Johannes Berg 已提交
1957
		dev_kfree_skb(skb);
1958
}
1959

1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
#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);
}


1979 1980 1981 1982
/*
 * As it function blongs to Rx path it must be called with
 * the proper rcu_read_lock protection for its flow.
 */
1983 1984 1985 1986 1987 1988 1989 1990 1991
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;
1992 1993
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

	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));
2024 2025
				sband = local->hw.wiphy->bands[status.band];
				rate = &sband->bitrates[status.rate_idx];
2026 2027
				__ieee80211_rx_handle_packet(hw,
					tid_agg_rx->reorder_buf[index],
2028
					&status, rate);
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
				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));
2068 2069
		sband = local->hw.wiphy->bands[status.band];
		rate = &sband->bitrates[status.rate_idx];
2070
		__ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2071
					     &status, rate);
2072 2073 2074 2075 2076 2077 2078 2079 2080
		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;
}

2081 2082
static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
				     struct sk_buff *skb)
2083 2084 2085 2086 2087
{
	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
2088
	u16 sc;
2089
	u16 mpdu_seq_num;
2090
	u8 ret = 0;
2091 2092 2093 2094 2095 2096 2097 2098
	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
2099
	if (!ieee80211_is_data_qos(hdr->frame_control))
2100 2101
		goto end_reorder;

2102
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2103

2104
	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2105 2106
		goto end_reorder;

2107 2108
	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

2109 2110
	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
		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) {
2125
		ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
2126 2127 2128 2129 2130 2131 2132 2133 2134
			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);
2135
 end_reorder:
2136 2137 2138
	return ret;
}

2139 2140 2141 2142 2143 2144 2145 2146
/*
 * 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);
2147 2148 2149 2150
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;

	if (status->band < 0 ||
A
Adrian Bunk 已提交
2151
	    status->band >= IEEE80211_NUM_BANDS) {
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
		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];
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179

	/*
	 * 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.
	 */
2180
	skb = ieee80211_rx_monitor(local, skb, status, rate);
2181 2182 2183 2184 2185
	if (!skb) {
		rcu_read_unlock();
		return;
	}

2186
	if (!ieee80211_rx_reorder_ampdu(local, skb))
2187
		__ieee80211_rx_handle_packet(hw, skb, status, rate);
2188 2189 2190

	rcu_read_unlock();
}
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
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);