rx.c 62 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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#include <linux/jiffies.h>
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#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
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#include <linux/rcupdate.h>
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#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>

#include "ieee80211_i.h"
#include "ieee80211_led.h"
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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)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

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

/*
 * This function copies a received frame to all monitor interfaces and
 * returns a cleaned-up SKB that no longer includes the FCS nor the
 * radiotap header the driver might have added.
 */
static struct sk_buff *
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
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		     struct ieee80211_rx_status *status,
		     struct ieee80211_rate *rate)
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{
	struct ieee80211_sub_if_data *sdata;
	int needed_headroom = 0;
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	struct ieee80211_radiotap_header *rthdr;
	__le64 *rttsft = NULL;
	struct ieee80211_rtap_fixed_data {
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		u8 flags;
		u8 rate;
		__le16 chan_freq;
		__le16 chan_flags;
		u8 antsignal;
		u8 padding_for_rxflags;
		__le16 rx_flags;
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	} __attribute__ ((packed)) *rtfixed;
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	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;
	int rtap_len = 0;

	/*
	 * First, we may need to make a copy of the skb because
	 *  (1) we need to modify it for radiotap (if not present), and
	 *  (2) the other RX handlers will modify the skb we got.
	 *
	 * We don't need to, of course, if we aren't going to return
	 * the SKB because it has a bad FCS/PLCP checksum.
	 */
	if (status->flag & RX_FLAG_RADIOTAP)
		rtap_len = ieee80211_get_radiotap_len(origskb->data);
	else
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		/* room for radiotap header, always present fields and TSFT */
		needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
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	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
		present_fcs_len = FCS_LEN;

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

		return remove_monitor_info(local, origskb, rtap_len);
	}

	if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
		/* only need to expand headroom if necessary */
		skb = origskb;
		origskb = NULL;

		/*
		 * This shouldn't trigger often because most devices have an
		 * RX header they pull before we get here, and that should
		 * be big enough for our radiotap information. We should
		 * probably export the length to drivers so that we can have
		 * them allocate enough headroom to start with.
		 */
		if (skb_headroom(skb) < needed_headroom &&
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		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
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			dev_kfree_skb(skb);
			return NULL;
		}
	} else {
		/*
		 * Need to make a copy and possibly remove radiotap header
		 * and FCS from the original.
		 */
		skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);

		origskb = remove_monitor_info(local, origskb, rtap_len);

		if (!skb)
			return origskb;
	}

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

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

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

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

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	skb_reset_mac_header(skb);
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	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

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

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

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

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

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

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

	return origskb;
}


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static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
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{
	u8 *data = rx->skb->data;
	int tid;

	/* does the frame have a qos control field? */
	if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
		u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
		/* frame has qos control */
		tid = qc[0] & QOS_CONTROL_TID_MASK;
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		if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
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			rx->flags |= IEEE80211_RX_AMSDU;
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		else
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			rx->flags &= ~IEEE80211_RX_AMSDU;
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	} else {
		if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
			/* Separate TID for management frames */
			tid = NUM_RX_DATA_QUEUES - 1;
		} else {
			/* no qos control present */
			tid = 0; /* 802.1d - Best Effort */
		}
	}
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	I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
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	/* only a debug counter, sta might not be assigned properly yet */
	if (rx->sta)
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		I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);

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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
	int hdrlen;

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

	/*
	 * Drivers are required to align the payload data in a way that
	 * guarantees that the contained IP header is aligned to a four-
	 * byte boundary. In the case of regular frames, this simply means
	 * aligning the payload to a four-byte boundary (because either
	 * the IP header is directly contained, or IV/RFC1042 headers that
	 * have a length divisible by four are in front of it.
	 *
	 * With A-MSDU frames, however, the payload data address must
	 * yield two modulo four because there are 14-byte 802.3 headers
	 * within the A-MSDU frames that push the IP header further back
	 * to a multiple of four again. Thankfully, the specs were sane
	 * enough this time around to require padding each A-MSDU subframe
	 * to a length that is a multiple of four.
	 *
	 * Padding like atheros hardware adds which is inbetween the 802.11
	 * header and the payload is not supported, the driver is required
	 * to move the 802.11 header further back in that case.
	 */
	hdrlen = ieee80211_get_hdrlen(rx->fc);
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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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static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
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				   struct sk_buff *skb,
				   struct ieee80211_rx_status *status,
				   struct ieee80211_rate *rate)
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{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	u32 load = 0, hdrtime;

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

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

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

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

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

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	return load;
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}

/* rx handlers */

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static ieee80211_rx_result
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ieee80211_rx_h_if_stats(struct ieee80211_rx_data *rx)
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{
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	if (rx->sta)
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		rx->sta->channel_use_raw += rx->load;
	rx->sdata->channel_use_raw += rx->load;
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	return RX_CONTINUE;
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}

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static ieee80211_rx_result
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ieee80211_rx_h_passive_scan(struct ieee80211_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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{
	int hdrlen = ieee80211_get_hdrlen(rx->fc);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
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#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))

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	if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
		if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
		      (rx->fc & IEEE80211_FCTL_TODS)))
			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 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
			return RX_DROP_MONITOR;

		switch (rx->fc & IEEE80211_FCTL_STYPE) {
		case IEEE80211_STYPE_ACTION:
			mgmt = (struct ieee80211_mgmt *)hdr;
			if (mgmt->u.action.category != PLINK_CATEGORY)
				return RX_DROP_MONITOR;
			/* fall through on else */
		case IEEE80211_STYPE_PROBE_REQ:
		case IEEE80211_STYPE_PROBE_RESP:
		case IEEE80211_STYPE_BEACON:
			return RX_CONTINUE;
			break;
		default:
			return RX_DROP_MONITOR;
		}

	 } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
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		    is_multicast_ether_addr(hdr->addr1) &&
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		    mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
		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
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ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
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{
	struct ieee80211_hdr *hdr;
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	hdr = (struct ieee80211_hdr *) rx->skb->data;

	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
	if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
		if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
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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(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
		      ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
		       (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
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		     rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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		     (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
		if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
		     !(rx->fc & IEEE80211_FCTL_TODS) &&
		     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
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		    || !(rx->flags & IEEE80211_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
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ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
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{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
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	int keyidx;
	int hdrlen;
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	ieee80211_rx_result result = RX_DROP_UNUSABLE;
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	struct ieee80211_key *stakey = NULL;
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	/*
	 * Key selection 101
	 *
	 * There are three types of keys:
	 *  - GTK (group keys)
	 *  - PTK (pairwise keys)
	 *  - STK (station-to-station pairwise keys)
	 *
	 * When selecting a key, we have to distinguish between multicast
	 * (including broadcast) and unicast frames, the latter can only
	 * use PTKs and STKs while the former always use GTKs. Unless, of
	 * course, actual WEP keys ("pre-RSNA") are used, then unicast
	 * frames can also use key indizes like GTKs. Hence, if we don't
	 * have a PTK/STK we check the key index for a WEP key.
	 *
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	 * Note that in a regular BSS, multicast frames are sent by the
	 * AP only, associated stations unicast the frame to the AP first
	 * which then multicasts it on their behalf.
	 *
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	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
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	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
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	 */

	if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
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		return RX_CONTINUE;
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	/*
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	 * No point in finding a key and decrypting if the frame is neither
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	 * addressed to us nor a multicast frame.
	 */
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	if (!(rx->flags & IEEE80211_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_get_hdrlen(rx->fc);

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

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		rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
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		/*
		 * RSNA-protected unicast frames should always be sent with
		 * pairwise or station-to-station keys, but for WEP we allow
		 * using a key index as well.
		 */
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		if (rx->key && rx->key->conf.alg != ALG_WEP &&
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		    !is_multicast_ether_addr(hdr->addr1))
			rx->key = NULL;
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	}

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	if (rx->key) {
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		rx->key->tx_rx_count++;
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		/* TODO: add threshold stuff again */
594
	} else {
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#ifdef CONFIG_MAC80211_DEBUG
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		if (net_ratelimit())
			printk(KERN_DEBUG "%s: RX protected frame,"
			       " but have no key\n", rx->dev->name);
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#endif /* CONFIG_MAC80211_DEBUG */
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		return RX_DROP_MONITOR;
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	}

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

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

623
	/* either the frame has been decrypted or will be dropped */
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	rx->status->flag |= RX_FLAG_DECRYPTED;
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	return result;
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}

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

634
	sdata = sta->sdata;
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	if (sdata->bss)
		atomic_inc(&sdata->bss->num_sta_ps);
	sta->flags |= WLAN_STA_PS;
639
	sta->flags &= ~WLAN_STA_PSPOLL;
640
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
}

static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	int sent = 0;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_tx_packet_data *pkt_data;
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	DECLARE_MAC_BUF(mac);
654

655
	sdata = sta->sdata;
656

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	if (sdata->bss)
		atomic_dec(&sdata->bss->num_sta_ps);
659

660
	sta->flags &= ~(WLAN_STA_PS | WLAN_STA_PSPOLL);
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	if (!skb_queue_empty(&sta->ps_tx_buf))
		sta_info_clear_tim_bit(sta);

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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
	       dev->name, print_mac(mac, sta->addr), sta->aid);
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
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	/* Send all buffered frames to the station */
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
		sent++;
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		pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
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		dev_queue_xmit(skb);
	}
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
		local->total_ps_buffered--;
		sent++;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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		printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
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		       "since STA not sleeping anymore\n", dev->name,
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		       print_mac(mac, sta->addr), sta->aid);
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
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		pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
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		dev_queue_xmit(skb);
	}

	return sent;
}

693
static ieee80211_rx_result
694
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
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{
	struct sta_info *sta = rx->sta;
	struct net_device *dev = rx->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;

	if (!sta)
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		return RX_CONTINUE;
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	/* 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. */
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	if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
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		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
						IEEE80211_IF_TYPE_IBSS);
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		if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
			sta->last_rx = jiffies;
	} else
	if (!is_multicast_ether_addr(hdr->addr1) ||
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	    rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
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		/* 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.
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		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
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		 */
		sta->last_rx = jiffies;
	}

723
	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
724
		return RX_CONTINUE;
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	sta->rx_fragments++;
	sta->rx_bytes += rx->skb->len;
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	sta->last_rssi = rx->status->ssi;
	sta->last_signal = rx->status->signal;
	sta->last_noise = rx->status->noise;
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	if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
		/* Change STA power saving mode only in the end of a frame
		 * exchange sequence */
		if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
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			rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
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		else if (!(sta->flags & WLAN_STA_PS) &&
			 (rx->fc & IEEE80211_FCTL_PM))
			ap_sta_ps_start(dev, sta);
	}

	/* Drop data::nullfunc frames silently, since they are used only to
	 * control station power saving mode. */
	if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
	    (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
		/* Update counter and free packet here to avoid counting this
		 * as a dropped packed. */
		sta->rx_packets++;
		dev_kfree_skb(rx->skb);
751
		return RX_QUEUED;
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	}

754
	return RX_CONTINUE;
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} /* ieee80211_rx_h_sta_process */

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

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

	if (!skb_queue_empty(&entry->skb_list)) {
#ifdef CONFIG_MAC80211_DEBUG
		struct ieee80211_hdr *hdr =
			(struct ieee80211_hdr *) entry->skb_list.next->data;
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		DECLARE_MAC_BUF(mac);
		DECLARE_MAC_BUF(mac2);
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		printk(KERN_DEBUG "%s: RX reassembly removed oldest "
		       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
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		       "addr1=%s addr2=%s\n",
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		       sdata->dev->name, idx,
		       jiffies - entry->first_frag_time, entry->seq,
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		       entry->last_frag, print_mac(mac, hdr->addr1),
		       print_mac(mac2, hdr->addr2));
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#endif /* CONFIG_MAC80211_DEBUG */
		__skb_queue_purge(&entry->skb_list);
	}

	__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
	*skb = NULL;
	entry->first_frag_time = jiffies;
	entry->seq = seq;
	entry->rx_queue = rx_queue;
	entry->last_frag = frag;
	entry->ccmp = 0;
	entry->extra_len = 0;

	return entry;
}

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
			  u16 fc, unsigned int frag, unsigned int seq,
			  int rx_queue, struct ieee80211_hdr *hdr)
{
	struct ieee80211_fragment_entry *entry;
	int i, idx;

	idx = sdata->fragment_next;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		struct ieee80211_hdr *f_hdr;
		u16 f_fc;

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

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

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

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

830
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
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			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

840
static ieee80211_rx_result
841
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
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{
	struct ieee80211_hdr *hdr;
	u16 sc;
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
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	DECLARE_MAC_BUF(mac);
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	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,
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						 rx->queue, &(rx->skb));
868
		if (rx->key && rx->key->conf.alg == ALG_CCMP &&
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		    (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,
874
			       rx->key->u.ccmp.rx_pn[rx->queue],
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			       CCMP_PN_LEN);
		}
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		return RX_QUEUED;
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	}

	/* 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,
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					  rx->queue, hdr);
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	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
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		return RX_DROP_MONITOR;
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	}

	/* 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;
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		if (!rx->key || rx->key->conf.alg != ALG_CCMP)
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			return RX_DROP_UNUSABLE;
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		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
			pn[i]++;
			if (pn[i])
				break;
		}
903
		rpn = rx->key->u.ccmp.rx_pn[rx->queue];
904
		if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
905 906
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: defrag: CCMP PN not "
907
				       "sequential A2=%s"
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				       " PN=%02x%02x%02x%02x%02x%02x "
				       "(expected %02x%02x%02x%02x%02x%02x)\n",
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				       rx->dev->name, print_mac(mac, hdr->addr2),
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				       rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
				       rpn[5], pn[0], pn[1], pn[2], pn[3],
				       pn[4], pn[5]);
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			return RX_DROP_UNUSABLE;
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		}
		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;
925
		return RX_QUEUED;
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	}

	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);
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			return RX_DROP_UNUSABLE;
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		}
	}
	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 */
944
	rx->flags |= IEEE80211_RX_FRAGMENTED;
945 946 947 948 949 950 951 952

 out:
	if (rx->sta)
		rx->sta->rx_packets++;
	if (is_multicast_ether_addr(hdr->addr1))
		rx->local->dot11MulticastReceivedFrameCount++;
	else
		ieee80211_led_rx(rx->local);
953
	return RX_CONTINUE;
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}

956
static ieee80211_rx_result
957
ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
958
{
959
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
960 961
	struct sk_buff *skb;
	int no_pending_pkts;
962
	DECLARE_MAC_BUF(mac);
963 964 965 966

	if (likely(!rx->sta ||
		   (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
		   (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
967
		   !(rx->flags & IEEE80211_RX_RA_MATCH)))
968
		return RX_CONTINUE;
969

970 971
	if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
	    (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
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972
		return RX_DROP_UNUSABLE;
973

974 975 976 977 978 979 980 981 982 983 984 985 986
	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;

987 988 989 990 991
		/*
		 * Tell TX path to send one frame even though the STA may
		 * still remain is PS mode after this frame exchange.
		 */
		rx->sta->flags |= WLAN_STA_PSPOLL;
992 993

#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
994 995
		printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
		       print_mac(mac, rx->sta->addr), rx->sta->aid,
996 997 998 999 1000
		       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 */
1001
		if (no_pending_pkts)
1002
			hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1003
		else
1004 1005 1006 1007
			hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);

		dev_queue_xmit(skb);

1008 1009
		if (no_pending_pkts)
			sta_info_clear_tim_bit(rx->sta);
1010
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1011
	} else if (!rx->sent_ps_buffered) {
1012 1013 1014 1015 1016 1017
		/*
		 * 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?
		 */
1018
		printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1019
		       "though there is no buffered frames for it\n",
1020
		       rx->dev->name, print_mac(mac, rx->sta->addr));
1021 1022 1023
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
	}

1024
	/* Free PS Poll skb here instead of returning RX_DROP that would
1025 1026 1027
	 * count as an dropped frame. */
	dev_kfree_skb(rx->skb);

1028
	return RX_QUEUED;
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}

1031
static ieee80211_rx_result
1032
ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1033 1034 1035 1036 1037 1038
{
	u16 fc = rx->fc;
	u8 *data = rx->skb->data;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;

	if (!WLAN_FC_IS_QOS_DATA(fc))
1039
		return RX_CONTINUE;
1040 1041 1042 1043 1044 1045 1046 1047

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

1048
	return RX_CONTINUE;
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}

1051
static int
1052
ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1053
{
1054
	if (unlikely(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED))) {
1055
#ifdef CONFIG_MAC80211_DEBUG
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		if (net_ratelimit())
			printk(KERN_DEBUG "%s: dropped frame "
			       "(unauthorized port)\n", rx->dev->name);
1059
#endif /* CONFIG_MAC80211_DEBUG */
1060
		return -EACCES;
1061 1062
	}

1063
	return 0;
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}

1066
static int
1067
ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1068
{
1069
	/*
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	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
1072
	 */
1073
	if (rx->status->flag & RX_FLAG_DECRYPTED)
1074
		return 0;
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	/* 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 &&
1080
		     (rx->key || rx->sdata->drop_unencrypted))) {
1081 1082 1083
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
			       "encryption\n", rx->dev->name);
1084
		return -EACCES;
1085
	}
1086
	return 0;
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}

1089
static int
1090
ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1091 1092 1093 1094 1095 1096 1097
{
	struct net_device *dev = rx->dev;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	u16 fc, hdrlen, ethertype;
	u8 *payload;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
1098
	struct sk_buff *skb = rx->skb;
1099
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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