add devicescape 802.11 stack

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2791 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 4895 insertions, 0 deletions

diff --git a/target/linux/package/ieee80211-dscape/src/ieee80211.c b/target/linux/package/ieee80211-dscape/src/ieee80211.c
new file mode 100644
index 000000000..5e4e7acfb
--- /dev/null
+++ b/target/linux/package/ieee80211-dscape/src/ieee80211.c
@@ -0,0 +1,4895 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005, Devicescape Software, Inc.
+ *
+ * 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.
+ */
+
+#ifndef EXPORT_SYMTAB
+#define EXPORT_SYMTAB
+#endif
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/wireless.h>
+#include <net/iw_handler.h>
+#include <linux/compiler.h>
+
+#include <net/ieee80211.h>
+#include <net/ieee80211_common.h>
+#include <net/ieee80211_mgmt.h>
+#include "ieee80211_i.h"
+#include "ieee80211_proc.h"
+#include "rate_control.h"
+#include "wep.h"
+#include "wpa.h"
+#include "tkip.h"
+#include "wme.h"
+
+
+/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
+/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
+static unsigned char rfc1042_header[] =
+{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
+/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
+static unsigned char bridge_tunnel_header[] =
+{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
+/* No encapsulation header if EtherType < 0x600 (=length) */
+
+static unsigned char eapol_header[] =
+{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
+
+
+struct rate_control_algs {
+	struct rate_control_algs *next;
+	struct rate_control_ops *ops;
+};
+
+static struct rate_control_algs *ieee80211_rate_ctrl_algs;
+
+static int rate_control_initialize(struct ieee80211_local *local);
+
+
+static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len);
+
+
+struct ieee80211_key_conf *
+ieee80211_key_data2conf(struct ieee80211_local *local,
+			struct ieee80211_key *data)
+{
+	struct ieee80211_key_conf *conf;
+
+	conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC);
+	if (conf == NULL)
+		return NULL;
+
+	conf->hw_key_idx = data->hw_key_idx;
+	conf->alg = data->alg;
+	conf->keylen = data->keylen;
+	conf->force_sw_encrypt = data->force_sw_encrypt;
+	conf->keyidx = data->keyidx;
+	conf->default_tx_key = data->default_tx_key;
+	conf->default_wep_only = local->default_wep_only;
+	memcpy(conf->key, data->key, data->keylen);
+
+	return conf;
+}
+
+
+static int rate_list_match(int *rate_list, int rate)
+{
+	int i;
+
+	if (rate_list == NULL)
+		return 0;
+
+	for (i = 0; rate_list[i] >= 0; i++)
+		if (rate_list[i] == rate)
+			return 1;
+
+	return 0;
+}
+
+
+void ieee80211_prepare_rates(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+	int i;
+
+	for (i = 0; i < local->num_curr_rates; i++) {
+		struct ieee80211_rate *rate = &local->curr_rates[i];
+
+		rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
+				 IEEE80211_RATE_BASIC);
+
+		if (local->supp_rates[local->conf.phymode]) {
+			if (!rate_list_match(local->supp_rates
+					     [local->conf.phymode],
+					     rate->rate))
+				continue;
+		}
+
+		rate->flags |= IEEE80211_RATE_SUPPORTED;
+
+		/* Use configured basic rate set if it is available. If not,
+		 * use defaults that are sane for most cases. */
+		if (local->basic_rates[local->conf.phymode]) {
+			if (rate_list_match(local->basic_rates
+					    [local->conf.phymode],
+					    rate->rate))
+				rate->flags |= IEEE80211_RATE_BASIC;
+		} else switch (local->conf.phymode) {
+		case MODE_IEEE80211A:
+			if (rate->rate == 60 || rate->rate == 120 ||
+			    rate->rate == 240)
+				rate->flags |= IEEE80211_RATE_BASIC;
+			break;
+		case MODE_IEEE80211B:
+			if (rate->rate == 10 || rate->rate == 20)
+				rate->flags |= IEEE80211_RATE_BASIC;
+			break;
+		case MODE_ATHEROS_TURBO:
+			if (rate->rate == 120 || rate->rate == 240 ||
+			    rate->rate == 480)
+				rate->flags |= IEEE80211_RATE_BASIC;
+			break;
+		case MODE_IEEE80211G:
+			if (rate->rate == 10 || rate->rate == 20 ||
+			    rate->rate == 55 || rate->rate == 110)
+				rate->flags |= IEEE80211_RATE_BASIC;
+			break;
+		}
+
+		/* Set ERP and MANDATORY flags based on phymode */
+		switch (local->conf.phymode) {
+		case MODE_IEEE80211A:
+			if (rate->rate == 60 || rate->rate == 120 ||
+			    rate->rate == 240)
+				rate->flags |= IEEE80211_RATE_MANDATORY;
+			break;
+		case MODE_IEEE80211B:
+			if (rate->rate == 10)
+				rate->flags |= IEEE80211_RATE_MANDATORY;
+			break;
+		case MODE_ATHEROS_TURBO:
+			break;
+		case MODE_IEEE80211G:
+			if (rate->rate == 10 || rate->rate == 20 ||
+			    rate->rate == 55 || rate->rate == 110 ||
+			    rate->rate == 60 || rate->rate == 120 ||
+			    rate->rate == 240)
+				rate->flags |= IEEE80211_RATE_MANDATORY;
+			if (rate->rate != 10 && rate->rate != 20 &&
+			    rate->rate != 55 && rate->rate != 110)
+				rate->flags |= IEEE80211_RATE_ERP;
+			break;
+		}
+	}
+}
+
+
+static void ieee80211_key_threshold_notify(struct net_device *dev,
+					   struct ieee80211_key *key,
+					   struct sta_info *sta)
+{
+	struct sk_buff *skb;
+	struct ieee80211_msg_key_notification *msg;
+
+	skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
+			    sizeof(struct ieee80211_msg_key_notification));
+	if (skb == NULL)
+		return;
+
+	skb_reserve(skb, sizeof(struct ieee80211_frame_info));
+	msg = (struct ieee80211_msg_key_notification *)
+		skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
+	msg->tx_rx_count = key->tx_rx_count;
+	memcpy(msg->ifname, dev->name, IFNAMSIZ);
+	if (sta)
+		memcpy(msg->addr, sta->addr, ETH_ALEN);
+	else
+		memset(msg->addr, 0xff, ETH_ALEN);
+
+	key->tx_rx_count = 0;
+
+	ieee80211_rx_mgmt(dev, skb, 0,
+			  ieee80211_msg_key_threshold_notification);
+}
+
+
+int ieee80211_get_hdrlen(u16 fc)
+{
+	int hdrlen = 24;
+
+	switch (WLAN_FC_GET_TYPE(fc)) {
+	case WLAN_FC_TYPE_DATA:
+		if ((fc & WLAN_FC_FROMDS) && (fc & WLAN_FC_TODS))
+			hdrlen = 30; /* Addr4 */
+		if (WLAN_FC_GET_STYPE(fc) & 0x08)
+			hdrlen += 2; /* QoS Control Field */
+		break;
+	case WLAN_FC_TYPE_CTRL:
+		switch (WLAN_FC_GET_STYPE(fc)) {
+		case WLAN_FC_STYPE_CTS:
+		case WLAN_FC_STYPE_ACK:
+			hdrlen = 10;
+			break;
+		default:
+			hdrlen = 16;
+			break;
+		}
+		break;
+	}
+
+	return hdrlen;
+}
+
+
+int ieee80211_get_hdrlen_from_skb(struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	int hdrlen;
+
+	if (unlikely(skb->len < 10))
+		return 0;
+	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+	if (unlikely(hdrlen > skb->len))
+		return 0;
+	return hdrlen;
+}
+
+
+#ifdef IEEE80211_VERBOSE_DEBUG_FRAME_DUMP
+static void ieee80211_dump_frame(const char *ifname, const char *title,
+				 struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	u16 fc;
+	int hdrlen;
+
+	printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
+	if (skb->len < 4) {
+		printk("\n");
+		return;
+	}
+
+	fc = le16_to_cpu(hdr->frame_control);
+	hdrlen = ieee80211_get_hdrlen(fc);
+	if (hdrlen > skb->len)
+		hdrlen = skb->len;
+	if (hdrlen >= 4)
+		printk(" FC=0x%04x DUR=0x%04x",
+		       fc, le16_to_cpu(hdr->duration_id));
+	if (hdrlen >= 10)
+		printk(" A1=" MACSTR, MAC2STR(hdr->addr1));
+	if (hdrlen >= 16)
+		printk(" A2=" MACSTR, MAC2STR(hdr->addr2));
+	if (hdrlen >= 24)
+		printk(" A3=" MACSTR, MAC2STR(hdr->addr3));
+	if (hdrlen >= 30)
+		printk(" A4=" MACSTR, MAC2STR(hdr->addr4));
+	printk("\n");
+}
+#else /* IEEE80211_VERBOSE_DEBUG_FRAME_DUMP */
+static inline void ieee80211_dump_frame(const char *ifname, const char *title,
+					struct sk_buff *skb)
+{
+}
+#endif /* IEEE80211_VERBOSE_DEBUG_FRAME_DUMP */
+
+
+static int ieee80211_is_eapol(struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr;
+	u16 fc;
+	int hdrlen;
+
+	if (unlikely(skb->len < 10))
+		return 0;
+
+	hdr = (struct ieee80211_hdr *) skb->data;
+	fc = le16_to_cpu(hdr->frame_control);
+
+	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
+		return 0;
+
+	hdrlen = ieee80211_get_hdrlen(fc);
+
+	if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
+		     memcmp(skb->data + hdrlen, eapol_header,
+			    sizeof(eapol_header)) == 0))
+		return 1;
+
+	return 0;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
+{
+	struct rate_control_extra extra;
+
+	memset(&extra, 0, sizeof(extra));
+	extra.mgmt_data = tx->sdata &&
+		tx->sdata->type == IEEE80211_SUB_IF_TYPE_MGMT;
+	extra.ethertype = tx->ethertype;
+	extra.startidx  = 0;
+	extra.endidx    = tx->local->num_curr_rates;
+
+
+        tx->u.tx.rate = rate_control_get_rate(tx->dev, tx->skb, &extra);
+	if (unlikely(extra.probe != NULL)) {
+		tx->u.tx.control->rate_ctrl_probe = 1;
+		tx->u.tx.probe_last_frag = 1;
+//		tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
+		tx->u.tx.rate = extra.probe;
+	} else {
+//		tx->u.tx.control->alt_retry_rate = -1;
+	}
+	if (!tx->u.tx.rate)
+		return TXRX_DROP;
+	if (tx->local->conf.phymode == MODE_IEEE80211G &&
+	    tx->local->cts_protect_erp_frames && tx->fragmented &&
+	    extra.nonerp) {
+		tx->u.tx.last_frag_rate = tx->u.tx.rate;
+		tx->u.tx.last_frag_rateidx = extra.rateidx;
+		tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
+
+		tx->u.tx.rate = extra.nonerp;
+//		tx->u.tx.control->rateidx = extra.nonerp_idx;
+		tx->u.tx.control->rate_ctrl_probe = 0;
+	} else {
+		tx->u.tx.last_frag_rate = tx->u.tx.rate;
+		tx->u.tx.last_frag_rateidx = extra.rateidx;
+//		tx->u.tx.control->rateidx = extra.rateidx;
+	}
+	tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
+	if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
+	    tx->local->short_preamble &&
+	    (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
+		tx->u.tx.short_preamble = 1;
+		tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
+{
+	if (tx->sta)
+		tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
+	else
+		tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
+
+	if (unlikely(tx->u.tx.control->do_not_encrypt))
+		tx->key = NULL;
+	else if (tx->sta && tx->sta->key)
+		tx->key = tx->sta->key;
+	else if (tx->sdata->default_key)
+		tx->key = tx->sdata->default_key;
+	else if (tx->sdata->drop_unencrypted && !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
+		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
+		return TXRX_DROP;
+	} else
+		tx->key = NULL;
+
+	if (tx->key) {
+		tx->key->tx_rx_count++;
+		if (unlikely(tx->local->key_tx_rx_threshold &&
+			     tx->key->tx_rx_count >
+			     tx->local->key_tx_rx_threshold)) {
+			ieee80211_key_threshold_notify(tx->dev, tx->key,
+						       tx->sta);
+		}
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+	size_t hdrlen, per_fragm, num_fragm, payload_len, left;
+	struct sk_buff **frags, *first, *frag;
+	int i;
+        u8 *pos;
+	int frag_threshold = tx->local->fragmentation_threshold;
+
+	if (!tx->fragmented)
+		return TXRX_CONTINUE;
+
+
+	first = tx->skb;
+
+	hdrlen = ieee80211_get_hdrlen(tx->fc);
+	payload_len = first->len - hdrlen;
+	per_fragm = frag_threshold - hdrlen - 4 /* FCS */;
+	num_fragm = (payload_len + per_fragm - 1) / per_fragm;
+
+	frags = (struct sk_buff **)
+		kmalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
+	if (frags == NULL)
+		goto fail;
+	memset(frags, 0, num_fragm * sizeof(struct sk_buff *));
+
+	hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREFRAG);
+	pos = first->data + hdrlen + per_fragm;
+	left = payload_len - per_fragm;
+	for (i = 0; i < num_fragm - 1; i++) {
+		struct ieee80211_hdr *fhdr;
+		size_t copylen;
+
+		if (left <= 0)
+			goto fail;
+
+		/* reserve enough extra head and tail room for possible
+		 * encryption */
+#define IEEE80211_ENCRYPT_HEADROOM 8
+#define IEEE80211_ENCRYPT_TAILROOM 12
+		frag = frags[i] =
+			dev_alloc_skb(frag_threshold +
+				      IEEE80211_ENCRYPT_HEADROOM +
+				      IEEE80211_ENCRYPT_TAILROOM);
+		if (!frag)
+			goto fail;
+		/* Make sure that all fragments use the same priority so
+		 * that they end up using the same TX queue */
+		frag->priority = first->priority;
+		skb_reserve(frag, IEEE80211_ENCRYPT_HEADROOM);
+		fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
+		memcpy(fhdr, first->data, hdrlen);
+		if (i == num_fragm - 2)
+			fhdr->frame_control &= cpu_to_le16(~WLAN_FC_MOREFRAG);
+		fhdr->seq_ctrl = cpu_to_le16(i + 1);
+		copylen = left > per_fragm ? per_fragm : left;
+		memcpy(skb_put(frag, copylen), pos, copylen);
+
+		pos += copylen;
+		left -= copylen;
+	}
+	skb_trim(first, hdrlen + per_fragm);
+
+	tx->u.tx.num_extra_frag = num_fragm - 1;
+	tx->u.tx.extra_frag = frags;
+
+	return TXRX_CONTINUE;
+
+ fail:
+	printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
+	if (frags) {
+		for (i = 0; i < num_fragm - 1; i++)
+			if (frags[i])
+				dev_kfree_skb(frags[i]);
+		kfree(frags);
+	}
+	I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
+	return TXRX_DROP;
+}
+
+
+static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
+{
+	if (tx->key->force_sw_encrypt || tx->local->conf.sw_encrypt) {
+		if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
+			return -1;
+	} else {
+		tx->u.tx.control->key_idx = tx->key->hw_key_idx;
+		if (tx->local->hw->wep_include_iv) {
+			if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
+			    NULL)
+				return -1;
+		}
+        }
+	return 0;
+}
+
+
+void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+
+	hdr->frame_control |= cpu_to_le16(WLAN_FC_ISWEP);
+	if (tx->u.tx.extra_frag) {
+		struct ieee80211_hdr *fhdr;
+		int i;
+		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
+			fhdr = (struct ieee80211_hdr *)
+				tx->u.tx.extra_frag[i]->data;
+			fhdr->frame_control |= cpu_to_le16(WLAN_FC_ISWEP);
+		}
+	}
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+	u16 fc;
+
+        fc = le16_to_cpu(hdr->frame_control);
+
+	if (!tx->key || tx->key->alg != ALG_WEP ||
+	    (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA &&
+	     (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_MGMT ||
+	      WLAN_FC_GET_STYPE(fc) != WLAN_FC_STYPE_AUTH)))
+		return TXRX_CONTINUE;
+
+	tx->u.tx.control->iv_len = WEP_IV_LEN;
+	tx->u.tx.control->icv_len = WEP_ICV_LEN;
+	ieee80211_tx_set_iswep(tx);
+
+	if (wep_encrypt_skb(tx, tx->skb) < 0) {
+		I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
+		return TXRX_DROP;
+	}
+
+	if (tx->u.tx.extra_frag) {
+		int i;
+		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
+                        if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
+				I802_DEBUG_INC(tx->local->
+					       tx_handlers_drop_wep);
+                                return TXRX_DROP;
+			}
+		}
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static inline int ceiling_div(int dividend, int divisor)
+{
+	return ((dividend + divisor - 1) / divisor);
+}
+
+
+static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
+				    int rate, int erp, int short_preamble)
+{
+	int dur;
+
+	/* calculate duration (in microseconds, rounded up to next higher
+	 * integer if it includes a fractional microsecond) to send frame of
+	 * len bytes (does not include FCS) at the given rate. Duration will
+	 * also include SIFS.
+	 *
+	 * rate is in 100 kbps, so divident is multiplied by 10 in the
+	 * ceiling_div() operations.
+	 */
+
+	if (local->conf.phymode == MODE_IEEE80211A || erp ||
+	    local->conf.phymode == MODE_ATHEROS_TURBO) {
+		/*
+		 * OFDM:
+		 *
+		 * N_DBPS = DATARATE x 4
+		 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
+		 *	(16 = SIGNAL time, 6 = tail bits)
+		 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
+		 *
+		 * T_SYM = 4 usec
+		 * 802.11a - 17.5.2: aSIFSTime = 16 usec
+		 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
+		 *	signal ext = 6 usec
+		 */
+		/* FIX: Atheros Turbo may have different (shorter) duration? */
+		dur = 16; /* SIFS + signal ext */
+		dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
+		dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
+		dur += 4 * ceiling_div((16 + 8 * (len + 4) + 6) * 10,
+				       4 * rate); /* T_SYM x N_SYM */
+	} else {
+		/*
+		 * 802.11b or 802.11g with 802.11b compatibility:
+		 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
+		 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
+		 *
+		 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
+		 * aSIFSTime = 10 usec
+		 * aPreambleLength = 144 usec or 72 usec with short preamble
+		 * aPLCPHeaderLength = 48 ms or 24 ms with short preamble
+		 */
+		dur = 10; /* aSIFSTime = 10 usec */
+		dur += short_preamble ? (72 + 24) : (144 + 48);
+
+		dur += ceiling_div(8 * (len + 4) * 10, rate);
+	}
+
+	return dur;
+}
+
+
+static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
+			      int next_frag_len)
+{
+	int rate, mrate, erp, dur, i;
+	struct ieee80211_rate *txrate = tx->u.tx.rate;
+	struct ieee80211_local *local = tx->local;
+
+	erp = txrate->flags & IEEE80211_RATE_ERP;
+
+	/*
+	 * data and mgmt (except PS Poll):
+	 * - during CFP: 32768
+	 * - during contention period:
+	 *   if addr1 is group address: 0
+	 *   if more fragments = 0 and addr1 is individual address: time to
+	 *      transmit one ACK plus SIFS
+	 *   if more fragments = 1 and addr1 is individual address: time to
+	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
+	 *
+	 * IEEE 802.11, 9.6:
+	 * - control response frame (CTS or ACK) shall be transmitted using the
+	 *   same rate as the immediately previous frame in the frame exchange
+	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
+	 *   at the highest possible rate belonging to the PHY rates in the
+	 *   BSSBasicRateSet
+	 */
+
+	if (WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_CTRL) {
+		/* TODO: These control frames are not currently sent by
+		 * 80211.o, but should they be implemented, this function
+		 * needs to be updated to support duration field calculation.
+		 *
+		 * RTS: time needed to transmit pending data/mgmt frame plus
+		 *    one CTS frame plus one ACK frame plus 3 x SIFS
+		 * CTS: duration of immediately previous RTS minus time
+		 *    required to transmit CTS and its SIFS
+		 * ACK: 0 if immediately previous directed data/mgmt had
+		 *    more=0, with more=1 duration in ACK frame is duration
+		 *    from previous frame minus time needed to transmit ACK
+		 *    and its SIFS
+		 * PS Poll: BIT(15) | BIT(14) | aid
+		 */
+		return 0;
+	}
+
+	/* data/mgmt */
+	if (0 /* FIX: data/mgmt during CFP */)
+		return 32768;
+
+	if (group_addr) /* Group address as the destination - no ACK */
+		return 0;
+
+	/* Individual destination address:
+	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
+	 * CTS and ACK frames shall be transmitted using the highest rate in
+	 * basic rate set that is less than or equal to the rate of the
+	 * immediately previous frame and that is using the same modulation
+	 * (CCK or OFDM). If no basic rate set matches with these requirements,
+	 * the highest mandatory rate of the PHY that is less than or equal to
+	 * the rate of the previous frame is used.
+	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
+	 */
+	rate = -1;
+	mrate = 10; /* use 1 Mbps if everything fails */
+	for (i = 0; i < local->num_curr_rates; i++) {
+		struct ieee80211_rate *r = &local->curr_rates[i];
+		if (r->rate > txrate->rate)
+			break;
+
+		if (IEEE80211_RATE_MODULATION(txrate->flags) !=
+		    IEEE80211_RATE_MODULATION(r->flags))
+			continue;
+
+		if (r->flags & IEEE80211_RATE_BASIC)
+			rate = r->rate;
+		else if (r->flags & IEEE80211_RATE_MANDATORY)
+			mrate = r->rate;
+	}
+	if (rate == -1) {
+		/* No matching basic rate found; use highest suitable mandatory
+		 * PHY rate */
+		rate = mrate;
+	}
+
+	/* Time needed to transmit ACK
+	 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
+	 * to closest integer */
+
+	dur = ieee80211_frame_duration(local, 10, rate, erp,
+                                       local->short_preamble);
+
+	if (next_frag_len) {
+		/* Frame is fragmented: duration increases with time needed to
+		 * transmit next fragment plus ACK and 2 x SIFS. */
+		dur *= 2; /* ACK + SIFS */
+		/* next fragment */
+		dur += ieee80211_frame_duration(local, next_frag_len,
+						txrate->rate, erp,
+						local->short_preamble);
+	}
+
+        return dur;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+	u16 dur;
+	struct ieee80211_tx_control *control = tx->u.tx.control;
+
+	if (!MULTICAST_ADDR(hdr->addr1)) {
+		if (tx->skb->len >= tx->local->rts_threshold &&
+		    tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
+			control->use_rts_cts = 1;
+			control->retry_limit =
+				tx->local->long_retry_limit;
+		} else {
+			control->retry_limit =
+				tx->local->short_retry_limit;
+		}
+	} else {
+		control->retry_limit = 1;
+	}
+
+	if (tx->fragmented) {
+		/* Do not use multiple retry rates when sending fragmented
+		 * frames.
+		 * TODO: The last fragment could still use multiple retry
+		 * rates. */
+//		control->alt_retry_rate = -1;
+	}
+
+	/* Use CTS protection for unicast frames sent using extended rates if
+	 * there are associated non-ERP stations and RTS/CTS is not configured
+	 * for the frame. */
+	if (tx->local->conf.phymode == MODE_IEEE80211G &&
+	    (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
+	    tx->u.tx.unicast &&
+	    tx->local->cts_protect_erp_frames &&
+	    !control->use_rts_cts)
+		control->use_cts_protect = 1;
+
+
+	/* Setup duration field for the first fragment of the frame. Duration
+	 * for remaining fragments will be updated when they are being sent
+	 * to low-level driver in ieee80211_tx(). */
+	dur = ieee80211_duration(tx, MULTICAST_ADDR(hdr->addr1),
+				 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
+				 0);
+	hdr->duration_id = cpu_to_le16(dur);
+
+	if (control->use_rts_cts || control->use_cts_protect) {
+		struct ieee80211_rate *rate;
+		int erp = tx->u.tx.rate->flags & IEEE80211_RATE_ERP;
+
+		/* Do not use multiple retry rates when using RTS/CTS */
+//		control->alt_retry_rate = -1;
+
+		/* Use min(data rate, max base rate) as CTS/RTS rate */
+		rate = tx->u.tx.rate;
+		while (rate > tx->local->curr_rates &&
+		       !(rate->flags & IEEE80211_RATE_BASIC))
+			rate--;
+
+
+		if (control->use_rts_cts)
+			dur += ieee80211_frame_duration(tx->local, 10,
+							rate->rate, erp,
+							tx->local->
+							short_preamble);
+		dur += ieee80211_frame_duration(tx->local, tx->skb->len,
+						tx->u.tx.rate->rate, erp,
+						tx->u.tx.short_preamble);
+		control->rts_cts_duration = dur;
+		control->rts_cts_rate = rate->val;
+	}
+
+	if (tx->sta) {
+		tx->sta->tx_packets++;
+		tx->sta->tx_fragments++;
+		tx->sta->tx_bytes += tx->skb->len;
+		if (tx->u.tx.extra_frag) {
+			int i;
+			tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
+			for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
+				tx->sta->tx_bytes +=
+					tx->u.tx.extra_frag[i]->len;
+			}
+		}
+        }
+	tx->local->scan.txrx_count++;
+
+	return TXRX_CONTINUE;
+}
+
+
+static void ieee80211_rate_limit(unsigned long data)
+{
+	struct ieee80211_local *local = (struct ieee80211_local *) data;
+
+	if (local->rate_limit) {
+                local->rate_limit_bucket += local->rate_limit;
+                if (local->rate_limit_bucket > local->rate_limit_burst)
+                        local->rate_limit_bucket = local->rate_limit_burst;
+		local->rate_limit_timer.expires = jiffies + HZ;
+		add_timer(&local->rate_limit_timer);
+        }
+
+}
+
+static ieee80211_txrx_result
+ieee80211_tx_h_rate_limit(struct ieee80211_txrx_data *tx)
+{
+
+	if (likely(!tx->local->rate_limit || tx->u.tx.unicast))
+                return TXRX_CONTINUE;
+
+	/* rate limit */
+        if (tx->local->rate_limit_bucket) {
+                tx->local->rate_limit_bucket--;
+                return TXRX_CONTINUE;
+        }
+
+	I802_DEBUG_INC(tx->local->tx_handlers_drop_rate_limit);
+	return TXRX_DROP;
+}
+
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
+{
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	struct sk_buff *skb = tx->skb;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+	u32 sta_flags;
+
+	if (unlikely(tx->local->sta_scanning != 0) &&
+	    (WLAN_FC_GET_TYPE(tx->fc) != WLAN_FC_TYPE_MGMT ||
+	     WLAN_FC_GET_STYPE(tx->fc) != WLAN_FC_STYPE_PROBE_REQ))
+		return TXRX_DROP;
+
+	if (tx->u.tx.ps_buffered)
+		return TXRX_CONTINUE;
+
+	sta_flags = tx->sta ? tx->sta->flags : 0;
+
+	if (likely(tx->u.tx.unicast)) {
+		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
+			     tx->local->conf.mode != IW_MODE_ADHOC &&
+			     WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_DATA)) {
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+			printk(KERN_DEBUG "%s: dropped data frame to not "
+			       "associated station " MACSTR "\n",
+			       tx->dev->name, MAC2STR(hdr->addr1));
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
+			return TXRX_DROP;
+		}
+	} else {
+		if (unlikely(WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_DATA &&
+			     tx->local->num_sta == 0 &&
+			     !tx->local->allow_broadcast_always &&
+			     tx->local->conf.mode != IW_MODE_ADHOC)) {
+			/*
+			 * No associated STAs - no need to send multicast
+			 * frames.
+			 */
+			return TXRX_DROP;
+		}
+		return TXRX_CONTINUE;
+	}
+
+	if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
+		     !(sta_flags & WLAN_STA_AUTHORIZED))) {
+#ifdef CONFIG_IEEE80211_DEBUG
+		struct ieee80211_hdr *hdr =
+			(struct ieee80211_hdr *) tx->skb->data;
+		printk(KERN_DEBUG "%s: dropped frame to " MACSTR
+		       " (unauthorized port)\n", tx->dev->name,
+		       MAC2STR(hdr->addr1));
+#endif
+		I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
+		return TXRX_DROP;
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+/* This function is called whenever the AP is about to exceed the maximum limit
+ * of buffered frames for power saving STAs. This situation should not really
+ * happen often during normal operation, so dropping the oldest buffered packet
+ * from each queue should be OK to make some room for new frames. */
+static void purge_old_ps_buffers(struct ieee80211_local *local)
+{
+	int total = 0, purged = 0;
+	struct sk_buff *skb;
+	struct list_head *ptr;
+
+	spin_lock_bh(&local->sub_if_lock);
+	list_for_each(ptr, &local->sub_if_list)	{
+		struct ieee80211_if_norm *norm;
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		if (sdata->dev == local->mdev ||
+		    sdata->type != IEEE80211_SUB_IF_TYPE_NORM)
+			continue;
+		norm = &sdata->u.norm;
+		skb = skb_dequeue(&norm->ps_bc_buf);
+		if (skb) {
+			purged++;
+			dev_kfree_skb(skb);
+		}
+		total += skb_queue_len(&norm->ps_bc_buf);
+	}
+	spin_unlock_bh(&local->sub_if_lock);
+
+	spin_lock_bh(&local->sta_lock);
+	list_for_each(ptr, &local->sta_list) {
+		struct sta_info *sta =
+			list_entry(ptr, struct sta_info, list);
+		skb = skb_dequeue(&sta->ps_tx_buf);
+		if (skb) {
+			purged++;
+			dev_kfree_skb(skb);
+		}
+		total += skb_queue_len(&sta->ps_tx_buf);
+	}
+	spin_unlock_bh(&local->sta_lock);
+
+	local->total_ps_buffered = total;
+	printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
+	       local->mdev->name, purged);
+}
+
+
+static inline ieee80211_txrx_result
+ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
+{
+	/* broadcast/multicast frame */
+	/* If any of the associated stations is in power save mode,
+	 * the frame is buffered to be sent after DTIM beacon frame */
+	if (tx->local->hw->host_broadcast_ps_buffering &&
+	    tx->sdata->type != IEEE80211_SUB_IF_TYPE_WDS &&
+	    tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
+	    !(tx->fc & WLAN_FC_ORDER)) {
+		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
+			purge_old_ps_buffers(tx->local);
+		if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
+		    AP_MAX_BC_BUFFER) {
+			if (net_ratelimit()) {
+				printk(KERN_DEBUG "%s: BC TX buffer full - "
+				       "dropping the oldest frame\n",
+				       tx->dev->name);
+			}
+			dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
+		} else
+			tx->local->total_ps_buffered++;
+                skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
+		return TXRX_QUEUED;
+        }
+
+	return TXRX_CONTINUE;
+}
+
+
+static inline ieee80211_txrx_result
+ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
+{
+	struct sta_info *sta = tx->sta;
+
+	if (unlikely(!sta ||
+		     (WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_MGMT &&
+		      WLAN_FC_GET_STYPE(tx->fc) == WLAN_FC_STYPE_PROBE_RESP)))
+		return TXRX_CONTINUE;
+
+	if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
+		struct ieee80211_tx_packet_data *pkt_data;
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+		printk(KERN_DEBUG "STA " MACSTR " aid %d: PS buffer (entries "
+		       "before %d)\n",
+		       MAC2STR(sta->addr), sta->aid,
+		       skb_queue_len(&sta->ps_tx_buf));
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+		sta->flags |= WLAN_STA_TIM;
+		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
+			purge_old_ps_buffers(tx->local);
+		if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
+			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
+			if (net_ratelimit()) {
+				printk(KERN_DEBUG "%s: STA " MACSTR " TX "
+				       "buffer full - dropping oldest frame\n",
+				       tx->dev->name, MAC2STR(sta->addr));
+			}
+			dev_kfree_skb(old);
+		} else
+			tx->local->total_ps_buffered++;
+		/* Queue frame to be sent after STA sends an PS Poll frame */
+		if (skb_queue_empty(&sta->ps_tx_buf) && tx->local->hw->set_tim)
+			tx->local->hw->set_tim(tx->dev, sta->aid, 1);
+		pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
+		pkt_data->jiffies = jiffies;
+                skb_queue_tail(&sta->ps_tx_buf, tx->skb);
+		return TXRX_QUEUED;
+	}
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+	else if (unlikely(sta->flags & WLAN_STA_PS)) {
+		printk(KERN_DEBUG "%s: STA " MACSTR " in PS mode, but pspoll "
+		       "set -> send frame\n", tx->dev->name,
+		       MAC2STR(sta->addr));
+	}
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+	sta->pspoll = 0;
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
+{
+	if (unlikely(tx->u.tx.ps_buffered))
+		return TXRX_CONTINUE;
+
+	if (tx->u.tx.unicast)
+		return ieee80211_tx_h_unicast_ps_buf(tx);
+	else
+		return ieee80211_tx_h_multicast_ps_buf(tx);
+}
+
+
+static void inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
+					struct sk_buff *skb,
+					struct net_device *dev,
+					struct ieee80211_tx_control *control)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+        struct ieee80211_tx_packet_data *pkt_data;
+	int hdrlen;
+
+        pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
+
+	memset(tx, 0, sizeof(*tx));
+	tx->skb = skb;
+	tx->dev = pkt_data->sdata->dev; /* use original interface */
+	tx->local = local;
+        tx->sdata = pkt_data->sdata;
+	tx->sta = sta_info_get(local, hdr->addr1);
+	tx->fc = le16_to_cpu(hdr->frame_control);
+        control->power_level = local->conf.power_level;
+	tx->u.tx.control = control;
+        tx->u.tx.unicast = !MULTICAST_ADDR(hdr->addr1);
+        control->no_ack = MULTICAST_ADDR(hdr->addr1);
+	tx->fragmented = local->fragmentation_threshold <
+		IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
+		skb->len + 4 /* FCS */ > local->fragmentation_threshold &&
+		(local->hw->set_frag_threshold == NULL);
+	if (tx->sta == NULL)
+		control->clear_dst_mask = 1;
+	else if (tx->sta->clear_dst_mask) {
+		control->clear_dst_mask = 1;
+		tx->sta->clear_dst_mask = 0;
+	}
+	control->antenna_sel = local->conf.antenna_sel;
+	if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
+		control->antenna_sel = tx->sta->antenna_sel;
+	hdrlen = ieee80211_get_hdrlen(tx->fc);
+	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
+		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
+		tx->ethertype = (pos[0] << 8) | pos[1];
+	}
+
+}
+
+
+static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
+			struct ieee80211_tx_control *control, int mgmt)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sta_info *sta;
+	ieee80211_tx_handler *handler;
+	struct ieee80211_txrx_data tx;
+	ieee80211_txrx_result res = TXRX_DROP;
+        int ret, i;
+
+	if (unlikely(skb->len < 10)) {
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	ieee80211_tx_prepare(&tx, skb, dev, control);
+	sta = tx.sta;
+	tx.u.tx.mgmt_interface = mgmt;
+
+	for (handler = local->tx_handlers; *handler != NULL; handler++) {
+		res = (*handler)(&tx);
+		if (res != TXRX_CONTINUE)
+			break;
+	}
+
+	skb = tx.skb; /* handlers are allowed to change skb */
+
+	if (sta)
+		sta_info_release(local, sta);
+
+	if (unlikely(res == TXRX_DROP)) {
+		I802_DEBUG_INC(local->tx_handlers_drop);
+		goto drop;
+	}
+
+	if (unlikely(res == TXRX_QUEUED)) {
+		I802_DEBUG_INC(local->tx_handlers_queued);
+		return 0;
+	}
+
+	ieee80211_dump_frame(dev->name, "TX to low-level driver", skb);
+	ret = local->hw->tx(dev, skb, control);
+#ifdef IEEE80211_LEDS
+	if (!ret && local->tx_led_counter++ == 0) {
+                ieee80211_tx_led(1, dev);
+        }
+#endif /* IEEE80211_LEDS */
+	if (tx.u.tx.extra_frag) {
+		if (ret > 0) {
+			/* Must free all fragments and return 0 since skb data
+			 * has been fragmented into multiple buffers.
+			 * TODO: could free extra fragments and restore skb to
+			 * the original form since the data is still there and
+			 * then return nonzero so that Linux netif would
+			 * retry. */
+			goto drop;
+		}
+
+		skb = NULL; /* skb is now owned by low-level driver */
+		control->use_rts_cts = 0;
+		control->use_cts_protect = 0;
+		control->clear_dst_mask = 0;
+		for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
+			int next_len, dur;
+			struct ieee80211_hdr *hdr =
+				(struct ieee80211_hdr *)
+				tx.u.tx.extra_frag[i]->data;
+			if (i + 1 < tx.u.tx.num_extra_frag)
+				next_len = tx.u.tx.extra_frag[i + 1]->len;
+			else {
+				next_len = 0;
+				tx.u.tx.rate = tx.u.tx.last_frag_rate;
+				tx.u.tx.control->tx_rate = tx.u.tx.rate->val;
+//				tx.u.tx.control->rateidx =
+//					tx.u.tx.last_frag_rateidx;
+				tx.u.tx.control->rate_ctrl_probe =
+					tx.u.tx.probe_last_frag;
+			}
+			dur = ieee80211_duration(&tx, 0, next_len);
+			hdr->duration_id = cpu_to_le16(dur);
+
+			ieee80211_dump_frame(dev->name,
+					     "TX to low-level driver", skb);
+			ret = local->hw->tx(dev, tx.u.tx.extra_frag[i],
+					    control);
+			if (ret > 0)
+				goto drop;
+#ifdef IEEE80211_LEDS
+			if (local->tx_led_counter++ == 0) {
+                                ieee80211_tx_led(1, dev);
+                        }
+#endif /* IEEE80211_LEDS */
+			tx.u.tx.extra_frag[i] = NULL;
+		}
+		kfree(tx.u.tx.extra_frag);
+        }
+        if (ret == -1)
+		ret = 0;
+	return ret;
+
+ drop:
+	if (skb)
+		dev_kfree_skb(skb);
+	for (i = 0; i < tx.u.tx.num_extra_frag; i++)
+		if (tx.u.tx.extra_frag[i])
+			dev_kfree_skb(tx.u.tx.extra_frag[i]);
+        kfree(tx.u.tx.extra_frag);
+	return 0;
+}
+
+
+static int ieee80211_master_start_xmit(struct sk_buff *skb,
+				       struct net_device *dev)
+{
+	struct ieee80211_tx_control control;
+	struct ieee80211_tx_packet_data *pkt_data;
+	struct ieee80211_sub_if_data *sdata;
+	int ret = 1;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+	/*
+	 * copy control out of the skb so other people can use skb->cb
+	 */
+	pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
+	if (unlikely(pkt_data->magic != IEEE80211_CB_MAGIC)) {
+		printk(KERN_WARNING "%s: Someone messed with our skb->cb\n",
+		       dev->name);
+		dev_kfree_skb(skb);
+		return 0;
+	}
+	memcpy(&control, &pkt_data->control,
+	       sizeof(struct ieee80211_tx_control));
+
+	ret = ieee80211_tx(dev, skb, &control,
+			   pkt_data->sdata->type ==
+			   IEEE80211_SUB_IF_TYPE_MGMT);
+
+        return ret;
+}
+
+
+/**
+ * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
+ * subinterfaces (wlan#, WDS, and VLAN interfaces)
+ * @skb: packet to be sent
+ * @dev: incoming interface
+ *
+ * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
+ * not be freed, and caller is responsible for either retrying later or freeing
+ * skb).
+ *
+ * This function takes in an Ethernet header and encapsulates it with suitable
+ * IEEE 802.11 header based on which interface the packet is coming in. The
+ * encapsulated packet will then be passed to master interface, wlan#.11, for
+ * transmission (through low-level driver).
+ */
+static int ieee80211_subif_start_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+        struct ieee80211_local *local = (struct ieee80211_local *) dev->priv;
+	struct ieee80211_tx_packet_data *pkt_data;
+        struct ieee80211_sub_if_data *sdata;
+	int ret = 1, head_need;
+	u16 ethertype, hdrlen, fc;
+	struct ieee80211_hdr hdr;
+	u8 *encaps_data;
+        int encaps_len, skip_header_bytes;
+	int nh_pos, h_pos, no_encrypt = 0;
+	struct sta_info *sta;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	if (unlikely(skb->len < ETH_HLEN)) {
+		printk(KERN_DEBUG "%s: short skb (len=%d)\n",
+		       dev->name, skb->len);
+		ret = 0;
+		goto fail;
+	}
+
+	nh_pos = skb->nh.raw - skb->data;
+	h_pos = skb->h.raw - skb->data;
+
+	/* convert Ethernet header to proper 802.11 header (based on
+	 * operation mode) */
+	ethertype = (skb->data[12] << 8) | skb->data[13];
+	/* TODO: handling for 802.1x authorized/unauthorized port */
+	fc = (WLAN_FC_TYPE_DATA << 2) | (WLAN_FC_STYPE_DATA << 4);
+
+        if (likely(sdata->type == IEEE80211_SUB_IF_TYPE_NORM ||
+		   sdata->type == IEEE80211_SUB_IF_TYPE_VLAN)) {
+		if (local->conf.mode == IW_MODE_MASTER) {
+			fc |= WLAN_FC_FROMDS;
+			/* DA BSSID SA */
+			memcpy(hdr.addr1, skb->data, ETH_ALEN);
+			memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
+			memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
+		} else if (local->conf.mode == IW_MODE_INFRA) {
+			fc |= WLAN_FC_TODS;
+			/* BSSID SA DA */
+			memcpy(hdr.addr1, local->bssid, ETH_ALEN);
+			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+			memcpy(hdr.addr3, skb->data, ETH_ALEN);
+		} else if (local->conf.mode == IW_MODE_ADHOC) {
+			/* DA SA BSSID */
+			memcpy(hdr.addr1, skb->data, ETH_ALEN);
+			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+			memcpy(hdr.addr3, local->bssid, ETH_ALEN);
+		}
+                hdrlen = 24;
+        } else if (sdata->type == IEEE80211_SUB_IF_TYPE_WDS) {
+                fc |= WLAN_FC_FROMDS | WLAN_FC_TODS;
+		/* RA TA DA SA */
+                memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
+                memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
+                memcpy(hdr.addr3, skb->data, ETH_ALEN);
+                memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
+                hdrlen = 30;
+        } else if (sdata->type == IEEE80211_SUB_IF_TYPE_STA) {
+		if (local->conf.mode == IW_MODE_INFRA) {
+			fc |= WLAN_FC_TODS;
+			/* BSSID SA DA */
+			memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
+			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+			memcpy(hdr.addr3, skb->data, ETH_ALEN);
+		} else {
+			/* DA SA BSSID */
+			memcpy(hdr.addr1, skb->data, ETH_ALEN);
+			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+			memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
+		}
+		hdrlen = 24;
+        } else {
+                ret = 0;
+                goto fail;
+        }
+	
+	/* receiver is QoS enabled, use a QoS type frame */
+	sta = sta_info_get(local, hdr.addr1);
+	if (sta) {
+		if (sta->flags & WLAN_STA_WME) {
+			fc |= WLAN_FC_STYPE_QOS_DATA << 4;
+			hdrlen += 2;
+		}
+		sta_info_release(local, sta);
+	}
+	
+	hdr.frame_control = cpu_to_le16(fc);
+	hdr.duration_id = 0;
+	hdr.seq_ctrl = 0;
+
+	skip_header_bytes = ETH_HLEN;
+	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
+		encaps_data = bridge_tunnel_header;
+		encaps_len = sizeof(bridge_tunnel_header);
+		skip_header_bytes -= 2;
+	} else if (ethertype >= 0x600) {
+		encaps_data = rfc1042_header;
+		encaps_len = sizeof(rfc1042_header);
+		skip_header_bytes -= 2;
+	} else {
+		encaps_data = NULL;
+		encaps_len = 0;
+	}
+
+	skb_pull(skb, skip_header_bytes);
+	nh_pos -= skip_header_bytes;
+	h_pos -= skip_header_bytes;
+
+	/* TODO: implement support for fragments so that there is no need to
+	 * reallocate and copy payload; it might be enough to support one
+	 * extra fragment that would be copied in the beginning of the frame
+	 * data.. anyway, it would be nice to include this into skb structure
+	 * somehow
+	 *
+	 * There are few options for this:
+	 * use skb->cb as an extra space for 802.11 header
+	 * allocate new buffer if not enough headroom
+	 * make sure that there is enough headroom in every skb by increasing
+	 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
+	 * alloc_skb() (net/core/skbuff.c)
+	 */
+	head_need = hdrlen + encaps_len + (local->hw->extra_hdr_room ? 2 : 0);
+	head_need -= skb_headroom(skb);
+
+	/* We are going to modify skb data, so make a copy of it if happens to
+	 * be cloned. This could happen, e.g., with Linux bridge code passing
+	 * us broadcast frames. */
+
+	if (head_need > 0 || skb_cloned(skb)) {
+#if 0
+		printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
+		       "of headroom\n", dev->name, head_need);
+#endif
+
+		if (skb_cloned(skb))
+			I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
+		else
+			I802_DEBUG_INC(local->tx_expand_skb_head);
+		/* Since we have to reallocate the buffer, make sure that there
+		 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
+		 * before payload and 12 after). */
+		if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
+				     12, GFP_ATOMIC)) {
+			printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
+			       "\n", dev->name);
+			goto fail;
+		}
+	}
+
+	if (encaps_data) {
+		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
+		nh_pos += encaps_len;
+		h_pos += encaps_len;
+	}
+	memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
+	nh_pos += hdrlen;
+	h_pos += hdrlen;
+
+	pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
+	memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
+	pkt_data->magic = IEEE80211_CB_MAGIC;
+	pkt_data->sdata = sdata;
+	pkt_data->control.do_not_encrypt = no_encrypt;
+
+	skb->dev = sdata->master;
+	sdata->stats.tx_packets++;
+	sdata->stats.tx_bytes += skb->len;
+
+	/* Update skb pointers to various headers since this modified frame
+	 * is going to go through Linux networking code that may potentially
+	 * need things like pointer to IP header. */
+	skb->mac.raw = skb->data;
+	skb->nh.raw = skb->data + nh_pos;
+	skb->h.raw = skb->data + h_pos;
+
+
+        dev_queue_xmit(skb);
+
+        return 0;
+
+ fail:
+	if (!ret)
+                dev_kfree_skb(skb);
+
+	return ret;
+}
+
+
+/*
+ * This is the transmit routine for the 802.11 type interfaces
+ * called by upper layers of the linux networking
+ * stack when it has a frame to transmit
+ */
+static int
+ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_tx_packet_data *pkt_data;
+	struct ieee80211_hdr *hdr;
+	u16 fc;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+	if (skb->len < 10) {
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	hdr = (struct ieee80211_hdr *) skb->data;
+	fc = le16_to_cpu(hdr->frame_control);
+
+        pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
+	memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
+	pkt_data->magic = IEEE80211_CB_MAGIC;
+        pkt_data->sdata = sdata;
+
+	if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
+	    WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PROBE_RESP)
+		pkt_data->control.pkt_type = PKT_PROBE_RESP;
+
+        skb->priority = 20; /* use hardcode priority for mgmt TX queue */
+	skb->dev = sdata->master;
+
+	/*
+	 * We're using the protocol field of the the frame control header
+	 * to request TX callback for hostapd. BIT(1) is checked.
+	 */
+	if ((fc & BIT(1)) == BIT(1)) {
+		pkt_data->control.req_tx_status = 1;
+		fc &= ~BIT(1);
+		hdr->frame_control = cpu_to_le16(fc);
+	}
+
+
+
+	pkt_data->control.do_not_encrypt = !(fc & WLAN_FC_ISWEP);
+
+	sdata->stats.tx_packets++;
+        sdata->stats.tx_bytes += skb->len;
+
+        dev_queue_xmit(skb);
+
+	return 0;
+}
+
+
+static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
+				     struct ieee80211_if_norm *bss,
+				     struct sk_buff *skb)
+{
+	u8 *pos, *tim;
+	int aid0 = 0;
+	int i, num_bits = 0, n1, n2;
+	u8 bitmap[251];
+
+	/* Generate bitmap for TIM only if there are any STAs in power save
+	 * mode. */
+	if (atomic_read(&bss->num_sta_ps) > 0 && bss->max_aid > 0) {
+		memset(bitmap, 0, sizeof(bitmap));
+		spin_lock_bh(&local->sta_lock);
+		for (i = 0; i < bss->max_aid; i++) {
+			if (bss->sta_aid[i] &&
+			    (!skb_queue_empty(&bss->sta_aid[i]->ps_tx_buf) ||
+			     !skb_queue_empty(&bss->sta_aid[i]->tx_filtered)))
+			{
+				bitmap[(i + 1) / 8] |= 1 << (i + 1) % 8;
+				num_bits++;
+			}
+		}
+		spin_unlock_bh(&local->sta_lock);
+	}
+
+	if (bss->dtim_count == 0)
+		bss->dtim_count = bss->dtim_period - 1;
+	else
+		bss->dtim_count--;
+
+	tim = pos = (u8 *) skb_put(skb, 6);
+	*pos++ = WLAN_EID_TIM;
+	*pos++ = 4;
+	*pos++ = bss->dtim_count;
+	*pos++ = bss->dtim_period;
+
+	if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) {
+		aid0 = 1;
+	}
+
+	if (num_bits) {
+		/* Find largest even number N1 so that bits numbered 1 through
+		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
+		 * (N2 + 1) x 8 through 2007 are 0. */
+		n1 = 0;
+		for (i = 0; i < sizeof(bitmap); i++) {
+			if (bitmap[i]) {
+				n1 = i & 0xfe;
+				break;
+			}
+		}
+		n2 = n1;
+		for (i = sizeof(bitmap) - 1; i >= n1; i--) {
+			if (bitmap[i]) {
+				n2 = i;
+				break;
+			}
+		}
+
+		/* Bitmap control */
+		*pos++ = n1 | (aid0 ? 1 : 0);
+		/* Part Virt Bitmap */
+		memcpy(pos, bitmap + n1, n2 - n1 + 1);
+
+		tim[1] = n2 - n1 + 4;
+		skb_put(skb, n2 - n1);
+	} else {
+		*pos++ = aid0 ? 1 : 0; /* Bitmap control */
+		*pos++ = 0; /* Part Virt Bitmap */
+	}
+}
+
+
+
+
+struct sk_buff * ieee80211_beacon_get(struct net_device *dev, int bss_idx,
+				      struct ieee80211_tx_control *control)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sk_buff *skb;
+	struct net_device *bdev;
+	struct ieee80211_sub_if_data *sdata = NULL;
+	struct ieee80211_if_norm *norm = NULL;
+	struct ieee80211_rate *rate;
+	struct rate_control_extra extra;
+	u8 *b_head, *b_tail;
+	int bh_len, bt_len;
+
+
+	spin_lock_bh(&local->sub_if_lock);
+	if (bss_idx < 0 || bss_idx >= local->bss_dev_count)
+		bdev = NULL;
+	else {
+		bdev = local->bss_devs[bss_idx];
+		sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
+		norm = &sdata->u.norm;
+	}
+	spin_unlock_bh(&local->sub_if_lock);
+
+	if (bdev == NULL || norm == NULL || norm->beacon_head == NULL) {
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+		if (net_ratelimit())
+			printk(KERN_DEBUG "no beacon data avail for idx=%d "
+			       "(%s)\n", bss_idx, bdev ? bdev->name : "N/A");
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+		return NULL;
+	}
+
+	/* Assume we are generating the normal beacon locally */
+	b_head = norm->beacon_head;
+	b_tail = norm->beacon_tail;
+	bh_len = norm->beacon_head_len;
+	bt_len = norm->beacon_tail_len;
+
+
+	skb = dev_alloc_skb(bh_len + bt_len + 256 /* maximum TIM len */);
+	if (!skb)
+		return NULL;
+
+	memcpy(skb_put(skb, bh_len), b_head, bh_len);
+
+	ieee80211_beacon_add_tim(local, norm, skb);
+
+	if (b_tail) {
+		memcpy(skb_put(skb, bt_len), b_tail, bt_len);
+	}
+
+	memset(&extra, 0, sizeof(extra));
+	extra.endidx = local->num_curr_rates;
+
+
+	rate = rate_control_get_rate(dev, skb, &extra);
+	if (rate == NULL) {
+		if (net_ratelimit()) {
+			printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
+			       "found\n", dev->name);
+		}
+		dev_kfree_skb(skb);
+		return NULL;
+	}
+
+	control->tx_rate = (local->short_preamble &&
+			    (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
+		rate->val2 : rate->val;
+	control->antenna_sel = local->conf.antenna_sel;
+	control->power_level = local->conf.power_level;
+	control->no_ack = 1;
+	control->retry_limit = 1;
+	control->rts_cts_duration = 0;
+	control->clear_dst_mask = 1;
+
+
+	norm->num_beacons++;
+	return skb;
+}
+
+struct sk_buff *
+ieee80211_get_buffered_bc(struct net_device *dev, int bss_idx,
+			  struct ieee80211_tx_control *control)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sk_buff *skb;
+	struct sta_info *sta;
+	ieee80211_tx_handler *handler;
+	struct ieee80211_txrx_data tx;
+	ieee80211_txrx_result res = TXRX_DROP;
+	struct net_device *bdev;
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_if_norm *bss;
+
+
+	spin_lock_bh(&local->sub_if_lock);
+	if (bss_idx < 0 || bss_idx >= local->bss_dev_count) {
+		bdev = NULL;
+		bss = NULL;
+	} else {
+		bdev = local->bss_devs[bss_idx];
+		sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
+		bss = &sdata->u.norm;
+	}
+	spin_unlock_bh(&local->sub_if_lock);
+	if (bdev == NULL || bss == NULL || bss->beacon_head == NULL)
+		return NULL;
+
+	if (bss->dtim_count != 0)
+		return NULL; /* send buffered bc/mc only after DTIM beacon */
+	skb = skb_dequeue(&bss->ps_bc_buf);
+	memset(control, 0, sizeof(*control));
+	if (skb == NULL)
+		return NULL;
+	local->total_ps_buffered--;
+
+	if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
+		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+		/* more buffered multicast/broadcast frames ==> set MoreData
+		 * flag in IEEE 802.11 header to inform PS STAs */
+		hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREDATA);
+	}
+
+	ieee80211_tx_prepare(&tx, skb, dev, control);
+	sta = tx.sta;
+	tx.u.tx.ps_buffered = 1;
+
+	for (handler = local->tx_handlers; *handler != NULL; handler++) {
+		res = (*handler)(&tx);
+		if (res == TXRX_DROP || res == TXRX_QUEUED)
+			break;
+	}
+
+	if (res == TXRX_DROP) {
+		I802_DEBUG_INC(local->tx_handlers_drop);
+		dev_kfree_skb(skb);
+		skb = NULL;
+	} else if (res == TXRX_QUEUED) {
+		I802_DEBUG_INC(local->tx_handlers_queued);
+		skb = NULL;
+	}
+
+	if (sta)
+		sta_info_release(local, sta);
+
+	return skb;
+}
+
+
+int ieee80211_hw_config(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+	int i, ret = 0;
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d mode=%d "
+	       "phymode=%d\n", local->conf.channel, local->conf.freq,
+	       local->conf.mode, local->conf.phymode);
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+
+	if (local->hw->config)
+		ret = local->hw->config(dev, &local->conf);
+
+	for (i = 0; i < local->hw->num_modes; i++) {
+		struct ieee80211_hw_modes *mode = &local->hw->modes[i];
+		if (mode->mode == local->conf.phymode) {
+			if (local->curr_rates != mode->rates) {
+				rate_control_clear(local);
+			}
+			local->curr_rates = mode->rates;
+			local->num_curr_rates = mode->num_rates;
+			ieee80211_prepare_rates(dev);
+			break;
+		}
+	}
+
+	return ret;
+}
+
+
+struct ieee80211_conf *ieee80211_get_hw_conf(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+        return &local->conf;
+}
+
+
+static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* FIX: what would be proper limits for MTU?
+	 * This interface uses 802.3 frames. */
+	if (new_mtu < 256 || new_mtu > 2304 - 24 - 6) {
+		printk(KERN_WARNING "%s: invalid MTU %d\n",
+		       dev->name, new_mtu);
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+
+static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
+{
+	/* FIX: what would be proper limits for MTU?
+	 * This interface uses 802.11 frames. */
+	if (new_mtu < 256 || new_mtu > 2304) {
+		printk(KERN_WARNING "%s: invalid MTU %d\n",
+		       dev->name, new_mtu);
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+
+static void ieee80211_tx_timeout(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+
+	printk(KERN_WARNING "%s: resetting interface.\n", dev->name);
+
+	if (local->hw->reset(dev))
+		printk(KERN_ERR "%s: failed to reset interface.\n", dev->name);
+	else
+		netif_wake_queue(dev);
+}
+
+
+static int ieee80211_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sockaddr *a = addr;
+	struct list_head *ptr;
+	int res;
+
+	if (!local->hw->set_mac_address)
+		return -EOPNOTSUPP;
+
+	res = local->hw->set_mac_address(dev, addr);
+	if (res)
+		return res;
+
+	list_for_each(ptr, &local->sub_if_list)	{
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		memcpy(sdata->dev->dev_addr, a->sa_data, ETH_ALEN);
+	}
+
+	return 0;
+}
+
+
+static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
+{
+	struct ieee80211_sub_if_data *sdata;
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	return &(sdata->stats);
+}
+
+
+static int ieee80211_open(struct net_device *dev)
+{
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_local *local = dev->priv;
+	int res;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        if (local->open_count == 0) {
+		res = local->hw->open(sdata->master);
+		if (res)
+			return res;
+		ieee80211_init_scan(sdata->master);
+	}
+        local->open_count++;
+
+	netif_start_queue(dev);
+	return 0;
+}
+
+
+static int ieee80211_stop(struct net_device *dev)
+{
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_local *local = dev->priv;
+	int res;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        netif_stop_queue(dev);
+
+	local->open_count--;
+        if (local->open_count == 0) {
+		ieee80211_stop_scan(sdata->master);
+		res = local->hw->stop(sdata->master);
+		if (res)
+			return res;
+        }
+
+	return 0;
+}
+
+
+static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
+{
+	memcpy(haddr, skb->mac.raw + 10, ETH_ALEN); /* addr2 */
+	return ETH_ALEN;
+}
+
+
+static struct net_device *
+ieee80211_get_wds_dev(struct ieee80211_local *local, u8 *addr)
+{
+	struct list_head *ptr;
+
+	list_for_each(ptr, &local->sub_if_list)	{
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		if (sdata->type == IEEE80211_SUB_IF_TYPE_WDS &&
+		    memcmp(addr, sdata->u.wds.remote_addr, ETH_ALEN) == 0)
+			return sdata->dev;
+	}
+
+	return NULL;
+}
+
+
+static struct net_device * ieee80211_own_bssid(struct ieee80211_local *local,
+					       u8 *addr)
+{
+	int i;
+	struct net_device *dev = NULL;
+
+	spin_lock_bh(&local->sub_if_lock);
+	for (i = 0; i < local->bss_dev_count; i++) {
+		if ((memcmp(local->bss_devs[i]->dev_addr, addr, ETH_ALEN) == 0)
+		) {
+			dev = local->bss_devs[i];
+			break;
+		}
+	}
+	spin_unlock_bh(&local->sub_if_lock);
+
+	return dev;
+}
+
+
+
+
+static struct net_device * ieee80211_sta_bssid(struct ieee80211_local *local,
+					       u8 *addr, u8 *a1,
+					       int *sta_multicast)
+{
+	struct list_head *ptr;
+	int multicast;
+	u8 *own_addr = local->mdev->dev_addr;
+
+	multicast = a1[0] & 0x01;
+
+	/* Try O(1) lookup for a common case of only one AP being used. */
+	if (own_addr[0] == a1[0] && own_addr[1] == a1[1] &&
+	    own_addr[2] == a1[2]) {
+		int index = (((int) a1[3] << 16) | ((int) a1[4] << 8) | a1[5])
+			- (((int) own_addr[3] << 16) |
+			   ((int) own_addr[4] << 8) | own_addr[5]);
+		if (index >= 0 && index < local->conf.bss_count &&
+		    local->sta_devs[index]) {
+			struct net_device *dev = local->sta_devs[index];
+			struct ieee80211_sub_if_data *sdata;
+			sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+			if (memcmp(addr, sdata->u.sta.bssid, ETH_ALEN) == 0) {
+				*sta_multicast = multicast;
+				return dev;
+			}
+		}
+	}
+
+	if (!multicast)
+		return NULL;
+
+	/* Could not find station interface, resort to O(n) lookup. */
+	list_for_each(ptr, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		if (sdata->type != IEEE80211_SUB_IF_TYPE_STA)
+			continue;
+		if (!multicast &&
+		    memcmp(a1, sdata->dev->dev_addr, ETH_ALEN) != 0)
+			continue;
+
+		if (memcmp(addr, sdata->u.sta.bssid, ETH_ALEN) == 0 ||
+		    (memcmp(addr, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) == 0 &&
+		     local->conf.mode == IW_MODE_ADHOC)) {
+			*sta_multicast = multicast;
+			return sdata->dev;
+		}
+	}
+
+	return NULL;
+}
+
+
+static int ieee80211_own_addr(struct net_device *dev, u8 *addr)
+{
+	struct ieee80211_local *local = dev->priv;
+	u8 *own = dev->dev_addr;
+	int index;
+
+	/* Optimization: assume that BSSID mask does not change for first
+	 * three octets. */
+	if (own[0] != addr[0] || own[1] != addr[1] || own[2] != addr[2])
+		return 0;
+
+	index = (((int) addr[3] << 16) | ((int) addr[4] << 8) | addr[5]) -
+		(((int) own[3] << 16) | ((int) own[4] << 8) | own[5]);
+	if (index >= 0 && index < local->conf.bss_count &&
+	    local->sta_devs[index])
+		return 1;
+
+	return 0;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
+{
+	struct net_device *dev = rx->dev;
+	struct ieee80211_local *local = rx->local;
+        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
+	u16 fc, hdrlen, ethertype;
+	u8 *payload;
+	u8 dst[ETH_ALEN];
+	u8 src[ETH_ALEN];
+        struct sk_buff *skb = rx->skb, *skb2;
+        struct ieee80211_sub_if_data *sdata;
+
+	fc = rx->fc;
+	if (unlikely(WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA))
+		return TXRX_CONTINUE;
+
+	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
+		return TXRX_DROP;
+
+	hdrlen = ieee80211_get_hdrlen(fc);
+
+	/* convert IEEE 802.11 header + possible LLC headers into Ethernet
+	 * header
+	 * IEEE 802.11 address fields:
+	 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
+	 *   0     0   DA    SA    BSSID n/a
+	 *   0     1   DA    BSSID SA    n/a
+	 *   1     0   BSSID SA    DA    n/a
+	 *   1     1   RA    TA    DA    SA
+	 */
+
+	switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
+	case WLAN_FC_TODS:
+		/* BSSID SA DA */
+		memcpy(dst, hdr->addr3, ETH_ALEN);
+		memcpy(src, hdr->addr2, ETH_ALEN);
+
+		if (unlikely(local->conf.mode != IW_MODE_MASTER ||
+			     !ieee80211_own_bssid(local, hdr->addr1))) {
+			printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
+			       MACSTR " SA=" MACSTR " DA=" MACSTR ")\n",
+			       dev->name, MAC2STR(hdr->addr1),
+			       MAC2STR(hdr->addr2), MAC2STR(hdr->addr3));
+			return TXRX_DROP;
+		}
+		break;
+	case (WLAN_FC_TODS | WLAN_FC_FROMDS):
+		/* RA TA DA SA */
+		memcpy(dst, hdr->addr3, ETH_ALEN);
+		memcpy(src, hdr->addr4, ETH_ALEN);
+
+		dev = ieee80211_get_wds_dev(local, hdr->addr2);
+		if (!dev || memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) != 0) {
+			printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
+			       MACSTR " TA=" MACSTR " DA=" MACSTR " SA="
+			       MACSTR ")\n",
+			       rx->dev->name, MAC2STR(hdr->addr1),
+			       MAC2STR(hdr->addr2), MAC2STR(hdr->addr3),
+			       MAC2STR(hdr->addr4));
+			return TXRX_DROP;
+		}
+		break;
+	case WLAN_FC_FROMDS:
+		/* DA BSSID SA */
+		memcpy(dst, hdr->addr1, ETH_ALEN);
+		memcpy(src, hdr->addr3, ETH_ALEN);
+
+		sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+		if (sdata->type != IEEE80211_SUB_IF_TYPE_STA ||
+		    memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0 ||
+		    memcmp(hdr->addr2, sdata->u.sta.bssid, ETH_ALEN) != 0) {
+			return TXRX_DROP;
+		}
+		break;
+	case 0:
+		/* DA SA BSSID */
+		memcpy(dst, hdr->addr1, ETH_ALEN);
+		memcpy(src, hdr->addr2, ETH_ALEN);
+
+		if (local->conf.mode != IW_MODE_ADHOC ||
+		    memcmp(hdr->addr3, local->bssid, ETH_ALEN) != 0) {
+			if (net_ratelimit()) {
+				printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
+				       MACSTR " SA=" MACSTR " BSSID=" MACSTR
+				       ")\n",
+				       dev->name, MAC2STR(hdr->addr1),
+				       MAC2STR(hdr->addr2),
+				       MAC2STR(hdr->addr3));
+			}
+			return TXRX_DROP;
+		}
+		break;
+	}
+
+	payload = skb->data + hdrlen;
+
+	if (unlikely(skb->len - hdrlen < 8)) {
+		if (net_ratelimit()) {
+			printk(KERN_DEBUG "%s: RX too short data frame "
+			       "payload\n", dev->name);
+		}
+		return TXRX_DROP;
+	}
+
+	ethertype = (payload[6] << 8) | payload[7];
+
+	if (likely((memcmp(payload, rfc1042_header, 6) == 0 &&
+		    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
+		   memcmp(payload, bridge_tunnel_header, 6) == 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;
+                unsigned short len;
+		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;
+	}
+
+        if (rx->sta && !rx->sta->assoc_ap &&
+	    !(rx->sta && (rx->sta->flags & WLAN_STA_WDS)))
+                skb->dev = rx->sta->dev;
+        else
+                skb->dev = dev;
+
+        skb2 = NULL;
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        /*
+         * don't count the master since the low level code
+         * counts it already for us.
+         */
+        if (skb->dev != sdata->master) {
+		sdata->stats.rx_packets++;
+		sdata->stats.rx_bytes += skb->len;
+        }
+
+	if (local->bridge_packets && sdata->type != IEEE80211_SUB_IF_TYPE_WDS
+	    && sdata->type != IEEE80211_SUB_IF_TYPE_STA) {
+		if (MULTICAST_ADDR(skb->data)) {
+			/* send multicast frames both to higher layers in
+			 * local net stack and back to the wireless media */
+			skb2 = skb_copy(skb, GFP_ATOMIC);
+			if (skb2 == NULL)
+				printk(KERN_DEBUG "%s: failed to clone "
+				       "multicast frame\n", dev->name);
+		} else {
+			struct sta_info *dsta;
+                        dsta = sta_info_get(local, skb->data);
+                        if (dsta && dsta->dev == NULL) {
+                                printk(KERN_DEBUG "Station with null dev "
+				       "structure!\n");
+                        } else if (dsta && dsta->dev == dev) {
+				/* Destination station is associated to this
+				 * AP, so send the frame directly to it and
+				 * do not pass the frame to local net stack.
+                                 */
+				skb2 = skb;
+				skb = NULL;
+			}
+			if (dsta)
+				sta_info_release(local, dsta);
+		}
+	}
+
+	if (skb) {
+		/* deliver to local stack */
+		skb->protocol = eth_type_trans(skb, dev);
+		memset(skb->cb, 0, sizeof(skb->cb));
+		netif_rx(skb);
+	}
+
+	if (skb2) {
+		/* send to wireless media */
+		skb2->protocol = __constant_htons(ETH_P_802_3);
+		skb2->mac.raw = skb2->nh.raw = skb2->data;
+		dev_queue_xmit(skb2);
+        }
+
+	return TXRX_QUEUED;
+}
+
+
+static struct ieee80211_rate *
+ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
+{
+	int m, r;
+
+	for (m = 0; m < local->hw->num_modes; m++) {
+		struct ieee80211_hw_modes *mode = &local->hw->modes[m];
+		if (mode->mode != phymode)
+			continue;
+		for (r = 0; r < mode->num_rates; r++) {
+			struct ieee80211_rate *rate = &mode->rates[r];
+			if (rate->val == hw_rate ||
+			    (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
+			     rate->val2 == hw_rate))
+				return rate;
+		}
+	}
+
+	return NULL;
+}
+
+
+void
+ieee80211_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
+		  struct ieee80211_rx_status *status, u32 msg_type)
+{
+        struct ieee80211_local *local = dev->priv;
+        struct ieee80211_frame_info *fi;
+        size_t hlen;
+        struct ieee80211_sub_if_data *sdata;
+
+        dev = local->apdev;
+        skb->dev = dev;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+	if (skb_headroom(skb) < sizeof(struct ieee80211_frame_info)) {
+		I802_DEBUG_INC(local->rx_expand_skb_head);
+		if (pskb_expand_head(skb, sizeof(struct ieee80211_frame_info),
+				     0, GFP_ATOMIC)) {
+			dev_kfree_skb(skb);
+                        return;
+		}
+	}
+
+	hlen = sizeof(struct ieee80211_frame_info);
+	if (msg_type == ieee80211_msg_monitor)
+		hlen -= sizeof(fi->msg_type);
+
+	fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
+        memset(fi, 0, hlen);
+	if (msg_type != ieee80211_msg_monitor)
+		fi->msg_type = htonl(msg_type);
+	fi->version = htonl(IEEE80211_FI_VERSION);
+        fi->length = htonl(hlen);
+        if (status) {
+//                struct timespec ts;
+		struct ieee80211_rate *rate;
+
+#if 0
+                jiffies_to_timespec(status->hosttime, &ts);
+		fi->hosttime = cpu_to_be64(ts.tv_sec * 1000000 +
+					   ts.tv_nsec / 1000);
+		fi->mactime = cpu_to_be64(status->mactime);
+#endif
+		switch (status->phymode) {
+                case MODE_IEEE80211A:
+                        fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
+                        break;
+                case MODE_IEEE80211B:
+                        fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
+                        break;
+                case MODE_IEEE80211G:
+                        fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
+                        break;
+                case MODE_ATHEROS_TURBO:
+			fi->phytype =
+				htonl(ieee80211_phytype_dsss_dot11_turbo);
+                        break;
+                default:
+                        fi->phytype = 0xAAAAAAAA;
+			break;
+                }
+                fi->channel = htonl(status->channel);
+		rate = ieee80211_get_rate(local, status->phymode,
+					  status->rate);
+		if (rate) {
+			fi->datarate = htonl(rate->rate);
+			if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
+				if (status->rate == rate->val)
+					fi->preamble = htonl(2); /* long */
+				else if (status->rate == rate->val2)
+					fi->preamble = htonl(1); /* short */
+			} else
+				fi->preamble = htonl(0);
+		} else {
+			fi->datarate = htonl(0);
+			fi->preamble = htonl(0);
+		}
+
+                fi->antenna = htonl(status->antenna);
+                fi->priority = 0xffffffff; /* no clue */
+                fi->ssi_type = htonl(ieee80211_ssi_raw);
+                fi->ssi_signal = htonl(status->ssi);
+                fi->ssi_noise = 0x00000000;
+                fi->encoding = 0;
+	} else {
+                fi->ssi_type = htonl(ieee80211_ssi_none);
+        }
+
+        sdata->stats.rx_packets++;
+        sdata->stats.rx_bytes += skb->len;
+
+        skb->mac.raw = skb->data;
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+	skb->pkt_type = PACKET_OTHERHOST;
+	skb->protocol = __constant_htons(ETH_P_802_2);
+	memset(skb->cb, 0, sizeof(skb->cb));
+        netif_rx(skb);
+}
+
+
+int ieee80211_radar_status(struct net_device *dev, int channel, int radar,
+			   int radar_type)
+{
+	struct sk_buff *skb;
+	struct ieee80211_radar_info *msg;
+
+	skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
+			    sizeof(struct ieee80211_radar_info));
+
+	if (skb == NULL)
+		return -ENOMEM;
+	skb_reserve(skb, sizeof(struct ieee80211_frame_info));
+
+	msg = (struct ieee80211_radar_info *)
+		skb_put(skb, sizeof(struct ieee80211_radar_info));
+	msg->channel = channel;
+	msg->radar = radar;
+	msg->radar_type = radar_type;
+
+	ieee80211_rx_mgmt(dev, skb, 0, ieee80211_msg_radar);
+	return 0;
+}
+
+
+int ieee80211_set_aid_for_sta(struct net_device *dev, u8 *peer_address,
+			      u16 aid)
+{
+        struct sk_buff *skb;
+        struct ieee80211_msg_set_aid_for_sta *msg;
+
+	skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
+			    sizeof(struct ieee80211_msg_set_aid_for_sta));
+
+        if (skb == NULL)
+		return -ENOMEM;
+	skb_reserve(skb, sizeof(struct ieee80211_frame_info));
+
+        msg = (struct ieee80211_msg_set_aid_for_sta *)
+		skb_put(skb, sizeof(struct ieee80211_msg_set_aid_for_sta));
+	memcpy(msg->sta_address, peer_address, ETH_ALEN);
+        msg->aid = aid;
+
+        ieee80211_rx_mgmt(dev, skb, 0, ieee80211_msg_set_aid_for_sta);
+        return 0;
+}
+
+
+static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata;
+	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+
+	if (sdata->bss)
+		atomic_inc(&sdata->bss->num_sta_ps);
+	sta->flags |= WLAN_STA_PS;
+	sta->pspoll = 0;
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+	printk(KERN_DEBUG "%s: STA " MACSTR " aid %d enters power "
+	       "save mode\n", dev->name, MAC2STR(sta->addr), sta->aid);
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+}
+
+
+static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sk_buff *skb;
+	int sent = 0;
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_tx_packet_data *pkt_data;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+	if (sdata->bss)
+		atomic_dec(&sdata->bss->num_sta_ps);
+	sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
+	sta->pspoll = 0;
+	if (!skb_queue_empty(&sta->ps_tx_buf) && local->hw->set_tim)
+		local->hw->set_tim(dev, sta->aid, 0);
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+	printk(KERN_DEBUG "%s: STA " MACSTR " aid %d exits power "
+	       "save mode\n", dev->name, MAC2STR(sta->addr), sta->aid);
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+	/* 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++;
+		pkt_data->control.requeue = 1;
+		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 IEEE80211_VERBOSE_DEBUG_PS
+		printk(KERN_DEBUG "%s: STA " MACSTR " aid %d send PS frame "
+		       "since STA not sleeping anymore\n", dev->name,
+		       MAC2STR(sta->addr), sta->aid);
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+		pkt_data->control.requeue = 1;
+		dev_queue_xmit(skb);
+	}
+
+	return sent;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
+{
+	struct sk_buff *skb;
+	int no_pending_pkts;
+
+	if (likely(!rx->sta || WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_CTRL ||
+		   WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_PSPOLL))
+		return TXRX_CONTINUE;
+
+	skb = skb_dequeue(&rx->sta->tx_filtered);
+	if (skb == NULL) {
+		skb = skb_dequeue(&rx->sta->ps_tx_buf);
+		if (skb)
+			rx->local->total_ps_buffered--;
+	}
+	no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
+		skb_queue_empty(&rx->sta->ps_tx_buf);
+
+	if (skb) {
+		struct ieee80211_hdr *hdr =
+			(struct ieee80211_hdr *) skb->data;
+
+		/* tell TX path to send one frame even though the STA may
+		 * still remain is PS mode after this frame exchange */
+		rx->sta->pspoll = 1;
+
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+		printk(KERN_DEBUG "STA " MACSTR " aid %d: PS Poll (entries "
+		       "after %d)\n",
+		       MAC2STR(rx->sta->addr), rx->sta->aid,
+		       skb_queue_len(&rx->sta->ps_tx_buf));
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+
+		/* Use MoreData flag to indicate whether there are more
+		 * buffered frames for this STA */
+		if (no_pending_pkts) {
+			hdr->frame_control &= cpu_to_le16(~WLAN_FC_MOREDATA);
+			rx->sta->flags &= ~WLAN_STA_TIM;
+		} else
+			hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREDATA);
+
+		dev_queue_xmit(skb);
+
+		if (no_pending_pkts && rx->local->hw->set_tim)
+			rx->local->hw->set_tim(rx->dev, rx->sta->aid, 0);
+#ifdef IEEE80211_VERBOSE_DEBUG_PS
+	} else if (!rx->u.rx.sent_ps_buffered) {
+		printk(KERN_DEBUG "%s: STA " MACSTR " sent PS Poll even "
+		       "though there is no buffered frames for it\n",
+		       rx->dev->name, MAC2STR(rx->sta->addr));
+#endif /* IEEE80211_VERBOSE_DEBUG_PS */
+
+	}
+
+	/* Free PS Poll skb here instead of returning TXRX_DROP that would
+	 * count as an dropped frame. */
+        dev_kfree_skb(rx->skb);
+
+	return TXRX_QUEUED;
+}
+
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_add(struct ieee80211_local *local,
+			 unsigned int frag, unsigned int seq, int rx_queue,
+			 struct sk_buff **skb)
+{
+        struct ieee80211_fragment_entry *entry;
+	int idx;
+
+	idx = local->fragment_next;
+	entry = &local->fragments[local->fragment_next++];
+	if (local->fragment_next >= IEEE80211_FRAGMENT_MAX)
+		local->fragment_next = 0;
+
+	if (entry->skb) {
+#ifdef CONFIG_IEEE80211_DEBUG
+		struct ieee80211_hdr *hdr =
+			(struct ieee80211_hdr *) entry->skb->data;
+		printk(KERN_DEBUG "%s: RX reassembly removed oldest "
+		       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
+		       "addr1=" MACSTR " addr2=" MACSTR "\n",
+		       local->mdev->name, idx,
+		       jiffies - entry->first_frag_time, entry->seq,
+		       entry->last_frag, MAC2STR(hdr->addr1),
+		       MAC2STR(hdr->addr2));
+#endif /* CONFIG_IEEE80211_DEBUG */
+		dev_kfree_skb(entry->skb);
+	}
+
+	entry->skb = *skb;
+	*skb = NULL;
+	entry->first_frag_time = jiffies;
+	entry->seq = seq;
+	entry->rx_queue = rx_queue;
+        entry->last_frag = frag;
+	entry->ccmp = 0;
+
+	return entry;
+}
+
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_find(struct ieee80211_local *local,
+			  u16 fc, unsigned int frag, unsigned int seq,
+			  int rx_queue, struct ieee80211_hdr *hdr)
+{
+	struct ieee80211_fragment_entry *entry;
+        int i, idx;
+
+	idx = local->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 = &local->fragments[idx];
+		if (!entry->skb || entry->seq != seq ||
+		    entry->rx_queue != rx_queue ||
+		    entry->last_frag + 1 != frag)
+			continue;
+
+		f_hdr = (struct ieee80211_hdr *) entry->skb->data;
+		f_fc = le16_to_cpu(f_hdr->frame_control);
+
+		if (WLAN_FC_GET_TYPE(fc) != WLAN_FC_GET_TYPE(f_fc) ||
+		    memcmp(hdr->addr1, f_hdr->addr1, ETH_ALEN) != 0 ||
+		    memcmp(hdr->addr2, f_hdr->addr2, ETH_ALEN) != 0)
+			continue;
+
+		if (entry->first_frag_time + 2 * HZ < jiffies) {
+			dev_kfree_skb(entry->skb);
+			entry->skb = NULL;
+			continue;
+		}
+		return entry;
+        }
+
+	return NULL;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
+{
+	struct ieee80211_hdr *hdr;
+	u16 sc;
+	unsigned int frag, seq;
+	struct ieee80211_fragment_entry *entry;
+
+	hdr = (struct ieee80211_hdr *) rx->skb->data;
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	frag = WLAN_GET_SEQ_FRAG(sc);
+
+	if (likely((!(rx->fc & WLAN_FC_MOREFRAG) && frag == 0) ||
+		   (rx->skb)->len < 24 || MULTICAST_ADDR(hdr->addr1))) {
+		/* not fragmented */
+		goto out;
+	}
+	I802_DEBUG_INC(rx->local->rx_handlers_fragments);
+
+	seq = WLAN_GET_SEQ_SEQ(sc);
+
+	if (frag == 0) {
+		/* This is the first fragment of a new frame. */
+		entry = ieee80211_reassemble_add(rx->local, frag, seq,
+						 rx->u.rx.queue, &(rx->skb));
+		if (rx->key && rx->key->alg == ALG_CCMP &&
+		    (rx->fc & WLAN_FC_ISWEP)) {
+			/* Store CCMP PN so that we can verify that the next
+			 * fragment has a sequential PN value. */
+			entry->ccmp = 1;
+			memcpy(entry->last_pn,
+			       rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
+			       CCMP_PN_LEN);
+		}
+		return TXRX_QUEUED;
+	}
+
+	/* 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->local, rx->fc, frag, seq,
+					  rx->u.rx.queue, hdr);
+	if (!entry) {
+		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+		return TXRX_DROP;
+	}
+
+	/* 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;
+		if (rx->key == NULL || rx->key->alg != ALG_CCMP)
+			return TXRX_DROP;
+		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
+		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
+			pn[i]++;
+			if (pn[i])
+				break;
+		}
+		rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
+		if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
+			printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
+			       " A2=" MACSTR " PN=%02x%02x%02x%02x%02x%02x "
+			       "(expected %02x%02x%02x%02x%02x%02x)\n",
+			       rx->dev->name, MAC2STR(hdr->addr2),
+			       rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
+			       pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
+			return TXRX_DROP;
+		}
+		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
+	}
+
+	/* TODO: could gather list of skb's and reallocate data buffer only
+	 * after finding out the total length of the frame */
+	skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
+	if (skb_tailroom(entry->skb) < rx->skb->len) {
+		I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
+		if (unlikely(pskb_expand_head(entry->skb, 0, rx->skb->len,
+					      GFP_ATOMIC))) {
+			I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+			return TXRX_DROP;
+		}
+	}
+	memcpy(skb_put(entry->skb, rx->skb->len), rx->skb->data, rx->skb->len);
+	entry->last_frag = frag;
+	dev_kfree_skb(rx->skb);
+
+	if (rx->fc & WLAN_FC_MOREFRAG) {
+                rx->skb = NULL;
+		return TXRX_QUEUED;
+	}
+
+	/* Complete frame has been reassembled - process it now */
+	rx->skb = entry->skb;
+	rx->fragmented = 1;
+        entry->skb = NULL;
+
+ out:
+	if (rx->sta)
+		rx->sta->rx_packets++;
+	if (MULTICAST_ADDR(hdr->addr1))
+		rx->local->dot11MulticastReceivedFrameCount++;
+#ifdef IEEE80211_LEDS
+        else
+		ieee80211_rx_led(2, rx->dev);
+#endif /* IEEE80211_LEDS */
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
+{
+	if (rx->local->conf.mode == IW_MODE_MONITOR) {
+		ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+                                  ieee80211_msg_monitor);
+		return TXRX_QUEUED;
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
+{
+	struct ieee80211_hdr *hdr;
+	int always_sta_key;
+	hdr = (struct ieee80211_hdr *) rx->skb->data;
+
+	/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
+	if (rx->sta && !MULTICAST_ADDR(hdr->addr1)) {
+		if (unlikely(rx->fc & WLAN_FC_RETRY &&
+			     rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
+			     hdr->seq_ctrl)) {
+			rx->local->dot11FrameDuplicateCount++;
+			rx->sta->num_duplicates++;
+			return TXRX_DROP;
+		} else
+			rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
+	}
+
+	if (rx->local->hw->rx_includes_fcs && rx->skb->len > FCS_LEN)
+		skb_trim(rx->skb, rx->skb->len - FCS_LEN);
+
+	if (unlikely(rx->skb->len < 16)) {
+		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
+		return TXRX_DROP;
+	}
+
+	/* Filter out foreign unicast packets when in promiscuous mode.
+	 * FIX: Filter out multicast to foreign BSSID. */
+	if (rx->local->conf.mode == IW_MODE_INFRA &&
+	    !MULTICAST_ADDR(hdr->addr1) &&
+	    !ieee80211_own_addr(rx->dev, hdr->addr1))
+		return TXRX_DROP;
+
+	/* Drop disallowed frame classes based on STA auth/assoc state;
+	 * IEEE 802.11, Chap 5.5.
+	 *
+	 * 80211.o does filtering only based on association state, i.e., it
+	 * drops Class 3 frames from not associated stations. hostapd sends
+	 * deauth/disassoc frames when needed. In addition, hostapd is
+	 * responsible for filtering on both auth and assoc states.
+	 */
+	if (unlikely((WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA ||
+		      (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_CTRL &&
+		       WLAN_FC_GET_STYPE(rx->fc) == WLAN_FC_STYPE_PSPOLL)) &&
+		     rx->local->conf.mode != IW_MODE_ADHOC &&
+		     (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
+		if (!(rx->fc & WLAN_FC_FROMDS) && !(rx->fc & WLAN_FC_TODS)) {
+			/* Drop IBSS frames silently. */
+			return TXRX_DROP;
+		}
+
+		ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+				  ieee80211_msg_sta_not_assoc);
+		return TXRX_QUEUED;
+	}
+
+	if (rx->local->conf.mode == IW_MODE_INFRA)
+		always_sta_key = 0;
+	else
+		always_sta_key = 1;
+
+	if (rx->sta && rx->sta->key && always_sta_key) {
+		rx->key = rx->sta->key;
+        } else {
+		if (!rx->sdata) {
+			printk(KERN_DEBUG "%s: sdata was null in packet!!\n",
+			       rx->dev->name);
+			printk(KERN_DEBUG "%s: Addr1: " MACSTR "\n",
+			       rx->dev->name, MAC2STR(hdr->addr1));
+			printk(KERN_DEBUG "%s: Addr2: " MACSTR "\n",
+			       rx->dev->name, MAC2STR(hdr->addr2));
+			printk(KERN_DEBUG "%s: Addr3: " MACSTR "\n",
+			       rx->dev->name, MAC2STR(hdr->addr3));
+			return TXRX_DROP;
+		}
+		if (rx->sta && rx->sta->key)
+			rx->key = rx->sta->key;
+		else
+			rx->key = rx->sdata->default_key;
+
+		if (rx->local->hw->wep_include_iv &&
+		    rx->fc & WLAN_FC_ISWEP) {
+			int keyidx = ieee80211_wep_get_keyidx(rx->skb);
+
+			if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
+			    (rx->sta == NULL || rx->sta->key == NULL ||
+			     keyidx > 0)) {
+				rx->key = rx->sdata->keys[keyidx];
+			}
+			if (!rx->key) {
+				printk(KERN_DEBUG "%s: RX WEP frame with "
+				       "unknown keyidx %d (A1=" MACSTR " A2="
+				       MACSTR " A3=" MACSTR ")\n",
+				       rx->dev->name, keyidx,
+				       MAC2STR(hdr->addr1),
+				       MAC2STR(hdr->addr2),
+				       MAC2STR(hdr->addr3));
+				ieee80211_rx_mgmt(
+					rx->dev, rx->skb, rx->u.rx.status,
+					ieee80211_msg_wep_frame_unknown_key);
+				return TXRX_QUEUED;
+			}
+		}
+        }
+
+	if (rx->fc & WLAN_FC_ISWEP && rx->key) {
+		rx->key->tx_rx_count++;
+		if (unlikely(rx->local->key_tx_rx_threshold &&
+			     rx->key->tx_rx_count >
+			     rx->local->key_tx_rx_threshold)) {
+			ieee80211_key_threshold_notify(rx->dev, rx->key,
+						       rx->sta);
+		}
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
+{
+	struct sta_info *sta = rx->sta;
+	struct net_device *dev = rx->dev;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
+
+	if (!sta)
+		return TXRX_CONTINUE;
+
+	/* 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. */
+	if (rx->local->conf.mode == IW_MODE_ADHOC) {
+		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
+		if (memcmp(bssid, rx->local->bssid, ETH_ALEN) == 0)
+			sta->last_rx = jiffies;
+	} else
+	if (!MULTICAST_ADDR(hdr->addr1) ||
+	    rx->local->conf.mode == IW_MODE_INFRA) {
+		/* Update last_rx only for unicast frames in order to prevent
+		 * the Probe Request frames (the only broadcast frames from a
+		 * STA in infrastructure mode) from keeping a connection alive.
+		 */
+		sta->last_rx = jiffies;
+	}
+	sta->rx_fragments++;
+	sta->rx_bytes += rx->skb->len;
+	sta->last_rssi = rx->u.rx.status->ssi;
+
+	if (!(rx->fc & WLAN_FC_MOREFRAG)) {
+		/* Change STA power saving mode only in the end of a frame
+		 * exchange sequence */
+		if ((sta->flags & WLAN_STA_PS) && !(rx->fc & WLAN_FC_PWRMGT))
+			rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
+		else if (!(sta->flags & WLAN_STA_PS) &&
+			 (rx->fc & WLAN_FC_PWRMGT))
+			ap_sta_ps_start(dev, sta);
+	}
+
+	/* Drop data::nullfunc frames silently, since they are used only to
+	 * control station power saving mode. */
+	if (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA &&
+	    WLAN_FC_GET_STYPE(rx->fc) == WLAN_FC_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);
+		return TXRX_QUEUED;
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
+{
+	if (!rx->sta || !(rx->fc & WLAN_FC_ISWEP) ||
+	    WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA || !rx->key ||
+	    rx->key->alg != ALG_WEP)
+		return TXRX_CONTINUE;
+
+	/* Check for weak IVs, if hwaccel did not remove IV from the frame */
+	if (rx->local->hw->wep_include_iv ||
+	    rx->key->force_sw_encrypt || rx->local->conf.sw_decrypt) {
+		u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
+		if (iv) {
+			rx->sta->wep_weak_iv_count++;
+		}
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
+{
+	/* If the device handles decryption totally, skip this test */
+	if (rx->local->hw->device_hides_wep)
+		return TXRX_CONTINUE;
+
+	if ((rx->key && rx->key->alg != ALG_WEP) ||
+	    !(rx->fc & WLAN_FC_ISWEP) ||
+	    (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA &&
+	     (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_MGMT ||
+	      WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_AUTH)))
+		return TXRX_CONTINUE;
+
+	if (!rx->key) {
+		printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
+		       rx->dev->name);
+		return TXRX_DROP;
+	}
+
+	if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
+	    rx->key->force_sw_encrypt || rx->local->conf.sw_decrypt) {
+		if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
+			printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
+			       "failed\n", rx->dev->name);
+			return TXRX_DROP;
+		}
+	} else if (rx->local->hw->wep_include_iv) {
+		ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
+		/* remove ICV */
+		skb_trim(rx->skb, rx->skb->len - 4);
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
+{
+	if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
+	    rx->local->conf.mode != IW_MODE_INFRA) {
+		/* Pass both encrypted and unencrypted EAPOL frames to user
+		 * space for processing. */
+		ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+                                  ieee80211_msg_normal);
+		return TXRX_QUEUED;
+	}
+
+	if (unlikely(rx->sdata->ieee802_1x &&
+		     WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA &&
+		     WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_NULLFUNC &&
+		     (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
+		     !ieee80211_is_eapol(rx->skb))) {
+#ifdef CONFIG_IEEE80211_DEBUG
+		struct ieee80211_hdr *hdr =
+			(struct ieee80211_hdr *) rx->skb->data;
+		printk(KERN_DEBUG "%s: dropped frame from " MACSTR
+		       " (unauthorized port)\n", rx->dev->name,
+		       MAC2STR(hdr->addr2));
+#endif /* CONFIG_IEEE80211_DEBUG */
+		return TXRX_DROP;
+	}
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
+{
+	/*  If the device handles decryption totally, skip this test */
+	if (rx->local->hw->device_hides_wep)
+		return TXRX_CONTINUE;
+
+	/* Drop unencrypted frames if key is set. */
+	if (unlikely(!(rx->fc & WLAN_FC_ISWEP) &&
+		     WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA &&
+		     WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_NULLFUNC &&
+		     (rx->key || rx->sdata->drop_unencrypted) &&
+		     (rx->sdata->eapol == 0 ||
+		      !ieee80211_is_eapol(rx->skb)))) {
+		printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
+		       "encryption\n", rx->dev->name);
+		return TXRX_DROP;
+	}
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
+{
+        struct ieee80211_sub_if_data *sdata;
+	sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
+	if (sdata->type == IEEE80211_SUB_IF_TYPE_STA) {
+		ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
+	} else {
+		/* Management frames are sent to hostapd for processing */
+		ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+				  ieee80211_msg_normal);
+	}
+	return TXRX_QUEUED;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
+{
+	struct ieee80211_local *local = rx->local;
+        struct sk_buff *skb = rx->skb;
+
+	if (unlikely(local->sta_scanning != 0)) {
+		ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
+		return TXRX_QUEUED;
+	}
+
+	if (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA)
+		local->scan.txrx_count++;
+        if (unlikely(local->scan.in_scan != 0 &&
+		     rx->u.rx.status->freq == local->scan.freq)) {
+                struct ieee80211_hdr *hdr;
+                u16 fc;
+
+                local->scan.rx_packets++;
+
+                hdr = (struct ieee80211_hdr *) skb->data;
+                fc = le16_to_cpu(hdr->frame_control);
+
+                if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
+		    WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON) {
+			local->scan.rx_beacon++;
+			/* Need to trim FCS here because it is normally
+			 * removed only after this passive scan handler. */
+			if (rx->local->hw->rx_includes_fcs &&
+			    rx->skb->len > FCS_LEN)
+				skb_trim(rx->skb, rx->skb->len - FCS_LEN);
+
+                        ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+                                          ieee80211_msg_passive_scan);
+                        return TXRX_QUEUED;
+                } else {
+			I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
+                        return TXRX_DROP;
+                }
+        }
+
+        return TXRX_CONTINUE;
+}
+
+
+static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
+{
+	u16 fc;
+
+	if (len < 24)
+		return NULL;
+
+	fc = le16_to_cpu(hdr->frame_control);
+
+	switch (WLAN_FC_GET_TYPE(fc)) {
+	case WLAN_FC_TYPE_DATA:
+		switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
+		case WLAN_FC_TODS:
+			return hdr->addr1;
+		case (WLAN_FC_TODS | WLAN_FC_FROMDS):
+			return NULL;
+		case WLAN_FC_FROMDS:
+			return hdr->addr2;
+		case 0:
+			return hdr->addr3;
+		}
+		break;
+	case WLAN_FC_TYPE_MGMT:
+		return hdr->addr3;
+	case WLAN_FC_TYPE_CTRL:
+		if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PSPOLL)
+			return hdr->addr1;
+		else
+			return NULL;
+	}
+
+	return NULL;
+}
+
+
+static struct net_device * ieee80211_get_rx_dev(struct ieee80211_local *local,
+						struct ieee80211_hdr *hdr,
+						size_t len, int *sta_broadcast)
+{
+	u8 *bssid;
+	struct net_device *dev;
+	u16 fc;
+
+	bssid = ieee80211_get_bssid(hdr, len);
+	if (bssid) {
+		dev = ieee80211_own_bssid(local, bssid);
+		if (!dev && (local->conf.mode == IW_MODE_INFRA ||
+			     local->conf.mode == IW_MODE_ADHOC))
+			dev = ieee80211_sta_bssid(local, bssid, hdr->addr1,
+						  sta_broadcast);
+		if (dev)
+			return dev;
+	}
+
+	if (len >= 30) {
+		fc = le16_to_cpu(hdr->frame_control);
+		if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
+		    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
+		    (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
+			dev = ieee80211_get_wds_dev(local, hdr->addr2);
+			if (dev)
+				return dev;
+		}
+	}
+
+	/* Default to default device if nothing else matches */
+	return local->wdev;
+}
+
+
+static void ieee80211_rx_michael_mic_report(struct net_device *dev,
+					    struct ieee80211_hdr *hdr,
+					    struct sta_info *sta,
+					    struct ieee80211_txrx_data *rx)
+{
+	int keyidx, hdrlen;
+
+	hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
+	if (rx->skb->len >= hdrlen + 4)
+		keyidx = rx->skb->data[hdrlen + 3] >> 6;
+	else
+		keyidx = -1;
+
+	/* TODO: verify that this is not triggered by fragmented
+	 * frames (hw does not verify MIC for them). */
+	printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
+	       "failure from " MACSTR " to " MACSTR " keyidx=%d\n",
+	       dev->name, MAC2STR(hdr->addr2), MAC2STR(hdr->addr1), keyidx);
+
+	if (sta == NULL) {
+		/* Some hardware versions seem to generate incorrect
+		 * Michael MIC reports; ignore them to avoid triggering
+		 * countermeasures. */
+		printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
+		       "error for unknown address " MACSTR "\n",
+		       dev->name, MAC2STR(hdr->addr2));
+		goto ignore;
+	}
+
+	if (!(rx->fc & WLAN_FC_ISWEP)) {
+		printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
+		       "error for a frame with no ISWEP flag (src "
+		       MACSTR ")\n", dev->name, MAC2STR(hdr->addr2));
+		goto ignore;
+	}
+
+	if (rx->local->hw->wep_include_iv &&
+	    rx->local->conf.mode == IW_MODE_MASTER) {
+		int keyidx = ieee80211_wep_get_keyidx(rx->skb);
+		/* AP with Pairwise keys support 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 BSS. */
+		if (keyidx) {
+			printk(KERN_DEBUG "%s: ignored Michael MIC error for "
+			       "a frame with non-zero keyidx (%d) (src " MACSTR
+			       ")\n", dev->name, keyidx, MAC2STR(hdr->addr2));
+			goto ignore;
+		}
+	}
+
+	if (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA &&
+	    (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_MGMT ||
+	     WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_AUTH)) {
+		printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
+		       "error for a frame that cannot be encrypted "
+		       "(fc=0x%04x) (src " MACSTR ")\n",
+		       dev->name, rx->fc, MAC2STR(hdr->addr2));
+		goto ignore;
+	}
+
+	do {
+		union iwreq_data wrqu;
+		char *buf = kmalloc(128, GFP_ATOMIC);
+		if (buf == NULL)
+			break;
+
+		/* TODO: needed parameters: count, key type, TSC */
+		sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
+			"keyid=%d %scast addr=" MACSTR ")",
+			keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
+			MAC2STR(hdr->addr2));
+		memset(&wrqu, 0, sizeof(wrqu));
+		wrqu.data.length = strlen(buf);
+		wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
+		kfree(buf);
+	} while (0);
+
+	/* TODO: consider verifying the MIC error report with software
+	 * implementation if we get too many spurious reports from the
+	 * hardware. */
+	ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
+			  ieee80211_msg_michael_mic_failure);
+	return;
+
+ ignore:
+	dev_kfree_skb(rx->skb);
+	rx->skb = NULL;
+}
+
+
+static void ieee80211_sta_rx_broadcast(struct ieee80211_txrx_data *rx)
+{
+	struct ieee80211_local *local = rx->dev->priv;
+	u8 *_bssid, bssid[ETH_ALEN];
+	struct sk_buff *orig_skb = rx->skb, *skb;
+	struct ieee80211_hdr *hdr;
+	ieee80211_rx_handler *handler;
+	ieee80211_txrx_result res;
+	struct list_head *ptr;
+
+	hdr = (struct ieee80211_hdr *) orig_skb->data;
+	_bssid = ieee80211_get_bssid(hdr, orig_skb->len);
+	if (_bssid == NULL) {
+		dev_kfree_skb(orig_skb);
+		return;
+	}
+	memcpy(bssid, _bssid, ETH_ALEN);
+
+	list_for_each(ptr, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		if (sdata->type != IEEE80211_SUB_IF_TYPE_STA ||
+		    (memcmp(bssid, sdata->u.sta.bssid, ETH_ALEN) != 0 &&
+		     !(bssid[0] & 0x01)))
+			continue;
+
+		skb = skb_copy(orig_skb, GFP_ATOMIC);
+		if (skb == NULL) {
+			if (net_ratelimit()) {
+				printk(KERN_DEBUG "%s: failed to copy "
+				       "multicast frame for %s",
+				       rx->dev->name, sdata->dev->name);
+			}
+			continue;
+		}
+
+		hdr = (struct ieee80211_hdr *) skb->data;
+		rx->skb = skb;
+		rx->dev = sdata->dev;
+		rx->sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
+
+		res = TXRX_DROP;
+		for (handler = local->rx_handlers; *handler != NULL; handler++)
+		{
+			res = (*handler)(rx);
+			if (res == TXRX_DROP || res == TXRX_QUEUED)
+				break;
+		}
+
+		if (res == TXRX_DROP || *handler == NULL)
+			dev_kfree_skb(skb);
+	}
+
+	dev_kfree_skb(orig_skb);
+}
+
+
+/*
+ * 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 net_device *dev, struct sk_buff *skb,
+		  struct ieee80211_rx_status *status)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct sta_info *sta;
+	struct ieee80211_hdr *hdr;
+	ieee80211_rx_handler *handler;
+	struct ieee80211_txrx_data rx;
+        ieee80211_txrx_result res = TXRX_DROP;
+	u16 type;
+	int sta_broadcast = 0;
+
+	hdr = (struct ieee80211_hdr *) skb->data;
+	memset(&rx, 0, sizeof(rx));
+	rx.skb = skb;
+	rx.local = local;
+	if (skb->len >= 16) {
+		sta = rx.sta = sta_info_get(local, hdr->addr2);
+		if (unlikely(sta == NULL &&
+			     local->conf.mode == IW_MODE_ADHOC)) {
+			u8 *bssid = ieee80211_get_bssid(hdr, skb->len);
+			if (bssid &&
+			    memcmp(bssid, local->bssid, ETH_ALEN) == 0)
+				sta = rx.sta =
+					ieee80211_ibss_add_sta(dev, skb, bssid,
+							       hdr->addr2);
+		}
+	} else
+		sta = rx.sta = NULL;
+        if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS))
+		rx.dev = sta->dev;
+	else
+		rx.dev = ieee80211_get_rx_dev(local, hdr, skb->len,
+					      &sta_broadcast);
+
+	rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
+	rx.u.rx.status = status;
+	rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
+	type = WLAN_FC_GET_TYPE(rx.fc);
+	if (type == WLAN_FC_TYPE_DATA || type == WLAN_FC_TYPE_MGMT)
+		local->dot11ReceivedFragmentCount++;
+	if (sta_broadcast) {
+		ieee80211_sta_rx_broadcast(&rx);
+		goto end;
+	}
+
+        if ((status->flag & RX_FLAG_MMIC_ERROR)) {
+		ieee80211_rx_michael_mic_report(dev, hdr, sta, &rx);
+		goto end;
+        }
+
+	for (handler = local->rx_handlers; *handler != NULL; handler++) {
+		res = (*handler)(&rx);
+		if (res != TXRX_CONTINUE) {
+			if (res == TXRX_DROP) {
+				I802_DEBUG_INC(local->rx_handlers_drop);
+				if (sta)
+					sta->rx_dropped++;
+			}
+			if (res == TXRX_QUEUED)
+				I802_DEBUG_INC(local->rx_handlers_queued);
+			break;
+		}
+	}
+
+	if (res == TXRX_DROP || *handler == NULL)
+		dev_kfree_skb(skb);
+
+  end:
+	if (sta)
+                sta_info_release(local, sta);
+}
+
+
+static ieee80211_txrx_result
+ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
+{
+        struct ieee80211_local *local = tx->local;
+	struct sk_buff *skb = tx->skb;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	u32 load = 0, hdrtime;
+
+	/* TODO: this could be part of tx_status handling, so that the number
+	 * of retries would be known; TX rate should in that case be stored
+	 * somewhere with the packet */
+
+	/* 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 */
+
+	if (local->conf.phymode == MODE_IEEE80211A ||
+	    local->conf.phymode == MODE_ATHEROS_TURBO ||
+            local->conf.phymode == MODE_ATHEROS_TURBOG ||
+	    (local->conf.phymode == MODE_IEEE80211G &&
+	     tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
+		hdrtime = CHAN_UTIL_HDR_SHORT;
+	else
+		hdrtime = CHAN_UTIL_HDR_LONG;
+
+	load = hdrtime;
+	if (!MULTICAST_ADDR(hdr->addr1))
+		load += hdrtime;
+
+	if (tx->u.tx.control->use_rts_cts)
+		load += 2 * hdrtime;
+	else if (tx->u.tx.control->use_cts_protect)
+		load += hdrtime;
+
+	load += skb->len * tx->u.tx.rate->rate_inv;
+
+	if (tx->u.tx.extra_frag) {
+		int i;
+		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
+			load += 2 * hdrtime;
+			load += tx->u.tx.extra_frag[i]->len *
+				tx->u.tx.rate->rate;
+		}
+	}
+
+	/* Divide channel_use by 8 to avoid wrapping around the counter */
+        load >>= CHAN_UTIL_SHIFT;
+        local->channel_use_raw += load;
+	if (tx->sta)
+		tx->sta->channel_use_raw += load;
+        tx->sdata->channel_use_raw += load;
+
+	return TXRX_CONTINUE;
+}
+
+
+static ieee80211_txrx_result
+ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
+{
+        struct ieee80211_local *local = rx->local;
+	struct sk_buff *skb = rx->skb;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	u32 load = 0, hdrtime;
+	struct ieee80211_rate *rate;
+	int i;
+
+	/* Estimate total channel use caused by this frame */
+
+	if (unlikely(local->num_curr_rates < 0))
+		return TXRX_CONTINUE;
+
+	rate = &local->curr_rates[0];
+	for (i = 0; i < local->num_curr_rates; i++) {
+		if (local->curr_rates[i].val == rx->u.rx.status->rate) {
+			rate = &local->curr_rates[i];
+			break;
+		}
+	}
+
+	/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
+	 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
+
+	if (local->conf.phymode == MODE_IEEE80211A ||
+	    local->conf.phymode == MODE_ATHEROS_TURBO ||
+            local->conf.phymode == MODE_ATHEROS_TURBOG ||
+	    (local->conf.phymode == MODE_IEEE80211G &&
+	     rate->flags & IEEE80211_RATE_ERP))
+		hdrtime = CHAN_UTIL_HDR_SHORT;
+	else
+		hdrtime = CHAN_UTIL_HDR_LONG;
+
+	load = hdrtime;
+	if (!MULTICAST_ADDR(hdr->addr1))
+		load += hdrtime;
+
+	load += skb->len * rate->rate_inv;
+
+	/* Divide channel_use by 8 to avoid wrapping around the counter */
+        load >>= CHAN_UTIL_SHIFT;
+        local->channel_use_raw += load;
+	if (rx->sta)
+		rx->sta->channel_use_raw += load;
+        rx->sdata->channel_use_raw += load;
+
+	return TXRX_CONTINUE;
+}
+
+
+static void ieee80211_stat_refresh(unsigned long data)
+{
+	struct ieee80211_local *local = (struct ieee80211_local *) data;
+        struct list_head *ptr, *n;
+
+	if (!local->stat_time)
+		return;
+
+	/* go through all stations */
+	spin_lock_bh(&local->sta_lock);
+	list_for_each(ptr, &local->sta_list) {
+		struct sta_info *sta =
+			list_entry(ptr, struct sta_info, list);
+		sta->channel_use = (sta->channel_use_raw / local->stat_time) /
+			CHAN_UTIL_PER_10MS;
+		sta->channel_use_raw = 0;
+	}
+	spin_unlock_bh(&local->sta_lock);
+
+	/* go through all subinterfaces */
+	list_for_each_safe(ptr, n, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+                sdata->channel_use = (sdata->channel_use_raw /
+				      local->stat_time) / CHAN_UTIL_PER_10MS;
+                sdata->channel_use_raw = 0;
+
+        }
+
+	/* hardware interface */
+	local->channel_use = (local->channel_use_raw /
+			      local->stat_time) / CHAN_UTIL_PER_10MS;
+	local->channel_use_raw = 0;
+
+	local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
+	add_timer(&local->stat_timer);
+}
+
+
+/* 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 net_device *dev, struct sk_buff *skb,
+			  struct ieee80211_rx_status *status)
+{
+        struct ieee80211_local *local = dev->priv;
+
+        skb->dev = dev;
+        memcpy(skb->cb, status, sizeof(struct ieee80211_rx_status));
+        skb->pkt_type = ieee80211_rx_msg;
+        skb_queue_tail(&local->skb_queue, skb);
+        tasklet_schedule(&local->tasklet);
+}
+
+
+void ieee80211_tx_status_irqsafe(struct net_device *dev, struct sk_buff *skb,
+				 struct ieee80211_tx_status *status)
+{
+        struct ieee80211_local *local = dev->priv;
+	int tmp;
+
+	if (status->tx_filtered || status->excessive_retries) {
+		/* Need to save a copy of skb->cb somewhere. Storing it in the
+		 * end of the data might not be the most efficient way of doing
+		 * this (since it may require reallocation of packet data), but
+		 * should be good enough for now since tx_filtered or
+		 * excessive_retries should not be triggered that often. */
+		if (skb_is_nonlinear(skb)) {
+			if (skb_linearize(skb, GFP_ATOMIC)) {
+				printk(KERN_DEBUG "%s: Failed to linearize "
+				       "skb\n", dev->name);
+				dev_kfree_skb_irq(skb);
+				return;
+			}
+		}
+		if (skb_tailroom(skb) < sizeof(skb->cb) &&
+		    pskb_expand_head(skb, 0, sizeof(skb->cb), GFP_ATOMIC)) {
+			printk(KERN_DEBUG "%s: Failed to store skb->cb "
+			       "in skb->data for TX filtered frame\n",
+			       dev->name);
+			dev_kfree_skb_irq(skb);
+			return;
+		}
+		memcpy(skb_put(skb, sizeof(skb->cb)), skb->cb,
+		       sizeof(skb->cb));
+	}
+
+        skb->dev = dev;
+        memcpy(skb->cb, status, sizeof(struct ieee80211_tx_status));
+        skb->pkt_type = ieee80211_tx_status_msg;
+	skb_queue_tail(status->req_tx_status ?
+		       &local->skb_queue : &local->skb_queue_unreliable, skb);
+	tmp = skb_queue_len(&local->skb_queue) +
+		skb_queue_len(&local->skb_queue_unreliable);
+	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
+	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
+		dev_kfree_skb_irq(skb);
+		tmp--;
+		I802_DEBUG_INC(local->tx_status_drop);
+	}
+        tasklet_schedule(&local->tasklet);
+}
+
+
+static void ieee80211_tasklet_handler(unsigned long data)
+{
+        struct ieee80211_local *local = (struct ieee80211_local *) data;
+        struct sk_buff *skb;
+	struct ieee80211_rx_status rx_status;
+	struct ieee80211_tx_status tx_status;
+
+	while ((skb = skb_dequeue(&local->skb_queue)) ||
+	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
+                switch (skb->pkt_type) {
+		case ieee80211_rx_msg:
+			/* Make a copy of the RX status because the original
+			 * skb may be freed during processing. Clear skb->type
+			 * in order to not confuse kernel netstack. */
+			memcpy(&rx_status, skb->cb, sizeof(rx_status));
+			skb->pkt_type = 0;
+			ieee80211_rx(skb->dev, skb, &rx_status);
+			break;
+		case ieee80211_tx_status_msg:
+			/* Make a copy of the TX status because the original
+			 * skb may be freed during processing. */
+			memcpy(&tx_status, skb->cb, sizeof(tx_status));
+			skb->pkt_type = 0;
+			if ((tx_status.tx_filtered ||
+			     tx_status.excessive_retries) &&
+			    skb->len >= sizeof(skb->cb)) {
+				/* Restore skb->cb from the copy that was made
+				 * in ieee80211_tx_status_irqsafe() */
+				memcpy(skb->cb,
+				       skb->data + skb->len - sizeof(skb->cb),
+				       sizeof(skb->cb));
+				skb_trim(skb, skb->len - sizeof(skb->cb));
+			}
+			ieee80211_tx_status(skb->dev, skb, &tx_status);
+			break;
+		default: /* should never get here! */
+			printk(KERN_ERR "%s: Unknown message type (%d)\n",
+			       local->wdev->name, skb->pkt_type);
+			dev_kfree_skb(skb);
+			break;
+                }
+        }
+}
+
+
+/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
+ * make a prepared TX frame (one that has been given to hw) to look like brand
+ * new IEEE 802.11 frame that is ready to go through TX processing again. */
+static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
+				      struct ieee80211_key *key,
+				      struct sk_buff *skb)
+{
+	int hdrlen, iv_len, mic_len;
+
+	if (key == NULL)
+		return;
+
+	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+
+	switch (key->alg) {
+	case ALG_WEP:
+		iv_len = WEP_IV_LEN;
+		mic_len = WEP_ICV_LEN;
+		break;
+	case ALG_TKIP:
+		iv_len = TKIP_IV_LEN;
+		mic_len = TKIP_ICV_LEN;
+		break;
+	case ALG_CCMP:
+		iv_len = CCMP_HDR_LEN;
+		mic_len = CCMP_MIC_LEN;
+		break;
+	default:
+		return;
+	}
+
+	if (skb->len >= mic_len && key->force_sw_encrypt)
+		skb_trim(skb, skb->len - mic_len);
+	if (skb->len >= iv_len && skb->len > hdrlen) {
+		memmove(skb->data + iv_len, skb->data, hdrlen);
+		skb_pull(skb, iv_len);
+	}
+
+	{
+		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+		u16 fc = le16_to_cpu(hdr->frame_control);
+		if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
+			fc &= ~(WLAN_FC_STYPE_QOS_DATA << 4);
+			hdr->frame_control = cpu_to_le16(fc);
+			memmove(skb->data + 2, skb->data, hdrlen - 2);
+			skb_pull(skb, 2);
+		}
+	}
+}
+
+
+void ieee80211_tx_status(struct net_device *dev, struct sk_buff *skb,
+			 struct ieee80211_tx_status *status)
+{
+	struct sk_buff *skb2;
+        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+        struct ieee80211_local *local = dev->priv;
+	struct ieee80211_tx_packet_data *pkt_data =
+		(struct ieee80211_tx_packet_data *) skb->cb;
+	u16 frag, type;
+	u32 msg_type;
+
+	if (!status) {
+                printk(KERN_ERR
+		       "%s: ieee80211_tx_status called with NULL status\n",
+		       dev->name);
+		dev_kfree_skb(skb);
+		return;
+	}
+
+	if (status->excessive_retries) {
+		struct sta_info *sta;
+		
+
+		sta = sta_info_get(local, hdr->addr1);
+		if (sta) {
+			if (sta->flags & WLAN_STA_PS) {
+				/* The STA is in power save mode, so assume
+				 * that this TX packet failed because of that.
+				 */
+				status->excessive_retries = 0;
+				status->tx_filtered = 1;
+			}
+			sta_info_release(local, sta);
+		}
+	}
+
+	if (status->tx_filtered) {
+		struct sta_info *sta;
+		sta = sta_info_get(local, hdr->addr1);
+		if (sta) {
+
+			sta->tx_filtered_count++;
+
+			/* Clear the TX filter mask for this STA when sending
+			 * the next packet. If the STA went to power save mode,
+			 * this will happen when it is waking up for the next
+			 * time. */
+			sta->clear_dst_mask = 1;
+
+			/* TODO: Is the WLAN_STA_PS flag always set here or is
+			 * the race between RX and TX status causing some
+			 * packets to be filtered out before 80211.o gets an
+			 * update for PS status? This seems to be the case, so
+			 * no changes are likely to be needed. */
+			if (sta->flags & WLAN_STA_PS &&
+			    skb_queue_len(&sta->tx_filtered) <
+			    STA_MAX_TX_BUFFER) {
+				ieee80211_remove_tx_extra(local, sta->key,
+							  skb);
+				skb_queue_tail(&sta->tx_filtered, skb);
+			} else if (!(sta->flags & WLAN_STA_PS) &&
+				   !pkt_data->control.requeue) {
+				/* Software retry the packet once */
+				pkt_data->control.requeue = 1;
+				ieee80211_remove_tx_extra(local, sta->key,
+							  skb);
+				dev_queue_xmit(skb);
+			} else {
+				if (net_ratelimit()) {
+					printk(KERN_DEBUG "%s: dropped TX "
+					       "filtered frame queue_len=%d "
+					       "PS=%d @%lu\n",
+					       dev->name,
+					       skb_queue_len(
+						       &sta->tx_filtered),
+					       !!(sta->flags & WLAN_STA_PS),
+					       jiffies);
+				}
+				dev_kfree_skb(skb);
+			}
+			sta_info_release(local, sta);
+			return;
+		}
+	} else {
+		rate_control_tx_status(dev, skb, status);
+	}
+
+#ifdef IEEE80211_LEDS
+        if (local->tx_led_counter && (local->tx_led_counter-- == 1)) {
+                ieee80211_tx_led(0, dev);
+        }
+#endif /* IEEE80211_LEDS */
+        /* SNMP counters
+	 * Fragments are passed to low-level drivers as separate skbs, so these
+	 * are actually fragments, not frames. Update frame counters only for
+	 * the first fragment of the frame. */
+
+	frag = WLAN_GET_SEQ_FRAG(le16_to_cpu(hdr->seq_ctrl));
+	type = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_control));
+
+        if (status->ack) {
+		if (frag == 0) {
+			local->dot11TransmittedFrameCount++;
+			if (MULTICAST_ADDR(hdr->addr1))
+				local->dot11MulticastTransmittedFrameCount++;
+			if (status->retry_count > 0)
+				local->dot11RetryCount++;
+			if (status->retry_count > 1)
+				local->dot11MultipleRetryCount++;
+		}
+
+		/* This counter shall be incremented for an acknowledged MPDU
+		 * with an individual address in the address 1 field or an MPDU
+		 * with a multicast address in the address 1 field of type Data
+		 * or Management. */
+		if (!MULTICAST_ADDR(hdr->addr1) || type == WLAN_FC_TYPE_DATA ||
+		    type == WLAN_FC_TYPE_MGMT)
+			local->dot11TransmittedFragmentCount++;
+        } else {
+		if (frag == 0)
+			local->dot11FailedCount++;
+        }
+
+        if (!status->req_tx_status) {
+		dev_kfree_skb(skb);
+		return;
+	}
+
+	msg_type = status->ack ? ieee80211_msg_tx_callback_ack :
+		ieee80211_msg_tx_callback_fail;
+
+	/* skb was the original skb used for TX. Clone it and give the clone
+	 * to netif_rx(). Free original skb. */
+	skb2 = skb_copy(skb, GFP_ATOMIC);
+        if (!skb2) {
+		dev_kfree_skb(skb);
+		return;
+	}
+	dev_kfree_skb(skb);
+	skb = skb2;
+
+        /* Send frame to hostapd */
+        ieee80211_rx_mgmt(dev, skb, NULL, msg_type);
+}
+
+
+/* TODO: implement register/unregister functions for adding TX/RX handlers
+ * into ordered list */
+
+static ieee80211_rx_handler ieee80211_rx_handlers[] =
+{
+	ieee80211_rx_h_parse_qos,
+	ieee80211_rx_h_load_stats,
+	ieee80211_rx_h_monitor,
+	ieee80211_rx_h_passive_scan,
+	ieee80211_rx_h_check,
+	ieee80211_rx_h_sta_process,
+	ieee80211_rx_h_ccmp_decrypt,
+	ieee80211_rx_h_tkip_decrypt,
+	ieee80211_rx_h_wep_weak_iv_detection,
+	ieee80211_rx_h_wep_decrypt,
+	ieee80211_rx_h_defragment,
+	ieee80211_rx_h_ieee80211_rx_h_ps_poll,
+	ieee80211_rx_h_michael_mic_verify,
+	/* this must be after decryption - so header is counted in MPDU mic
+	 * must be before pae and data, so QOS_DATA format frames
+	 * are not passed to user space by these functions
+	 */
+	ieee80211_rx_h_remove_qos_control,
+	ieee80211_rx_h_802_1x_pae,
+	ieee80211_rx_h_drop_unencrypted,
+	ieee80211_rx_h_data,
+	ieee80211_rx_h_mgmt,
+	NULL
+};
+
+static ieee80211_tx_handler ieee80211_tx_handlers[] =
+{
+	ieee80211_tx_h_rate_limit,
+	ieee80211_tx_h_check_assoc,
+	ieee80211_tx_h_ps_buf,
+	ieee80211_tx_h_select_key,
+	ieee80211_tx_h_michael_mic_add,
+	ieee80211_tx_h_fragment,
+	ieee80211_tx_h_tkip_encrypt,
+	ieee80211_tx_h_ccmp_encrypt,
+	ieee80211_tx_h_wep_encrypt,
+	ieee80211_tx_h_rate_ctrl,
+	ieee80211_tx_h_misc,
+	ieee80211_tx_h_load_stats,
+	NULL
+};
+
+
+static void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
+{
+	/* Default values for sub-interface parameters */
+	sdata->drop_unencrypted = 0;
+	sdata->eapol = 1;
+}
+
+
+static struct net_device *ieee80211_if_add(struct net_device *dev,
+					   char *name, int locked)
+{
+	struct net_device *wds_dev = NULL, *tmp_dev;
+        struct ieee80211_local *local = dev->priv;
+	struct ieee80211_sub_if_data *sdata = NULL, *sdata_parent;
+        int alloc_size;
+	int ret;
+	int i;
+
+	/* ensure 32-bit alignment of our private data and hw private data */
+	alloc_size = sizeof(struct net_device) + 3 +
+		sizeof(struct ieee80211_sub_if_data) + 3;
+
+        wds_dev = (struct net_device *) kmalloc(alloc_size, GFP_KERNEL);
+        if (wds_dev == NULL)
+		return NULL;
+
+	memset(wds_dev, 0, alloc_size);
+	wds_dev->priv = local;
+	ether_setup(wds_dev);
+	if (strlen(name) == 0) {
+		i = 0;
+		do {
+			sprintf(wds_dev->name, "%s.%d", dev->name, i++);
+			tmp_dev = dev_get_by_name(wds_dev->name);
+			if (tmp_dev == NULL)
+				break;
+			dev_put(tmp_dev);
+		} while (i < 10000);
+	} else {
+                snprintf(wds_dev->name, IFNAMSIZ, "%s", name);
+	}
+
+	memcpy(wds_dev->dev_addr, dev->dev_addr, ETH_ALEN);
+	wds_dev->hard_start_xmit = ieee80211_subif_start_xmit;
+        wds_dev->do_ioctl = ieee80211_ioctl;
+	wds_dev->change_mtu = ieee80211_change_mtu;
+        wds_dev->tx_timeout = ieee80211_tx_timeout;
+        wds_dev->get_stats = ieee80211_get_stats;
+        wds_dev->open = ieee80211_open;
+	wds_dev->stop = ieee80211_stop;
+	wds_dev->base_addr = dev->base_addr;
+	wds_dev->irq = dev->irq;
+	wds_dev->mem_start = dev->mem_start;
+	wds_dev->mem_end = dev->mem_end;
+	wds_dev->tx_queue_len = 0;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(wds_dev);
+        sdata->type = IEEE80211_SUB_IF_TYPE_NORM;
+        sdata->master = local->mdev;
+        sdata->dev = wds_dev;
+	sdata->local = local;
+	memset(&sdata->stats, 0, sizeof(struct net_device_stats));
+	sdata_parent = IEEE80211_DEV_TO_SUB_IF(dev);
+	if (sdata_parent->type == IEEE80211_SUB_IF_TYPE_NORM)
+		sdata->bss = &sdata_parent->u.norm;
+	else {
+		printk(KERN_DEBUG "%s: could not set BSS pointer for new "
+		       "interface %s\n", dev->name, wds_dev->name);
+	}
+	ieee80211_if_sdata_init(sdata);
+
+        if (locked)
+		ret = register_netdevice(wds_dev);
+	else
+		ret = register_netdev(wds_dev);
+	if (ret) {
+		kfree(wds_dev);
+		return NULL;
+	}
+
+        list_add(&sdata->list, &local->sub_if_list);
+
+        strcpy(name, wds_dev->name);
+
+        return wds_dev;
+}
+
+
+int ieee80211_if_add_wds(struct net_device *dev, char *name,
+                         struct ieee80211_if_wds *wds, int locked)
+{
+        struct net_device *wds_dev = NULL;
+	struct ieee80211_sub_if_data *sdata = NULL;
+
+        if (strlen(name) != 0) {
+                wds_dev = dev_get_by_name(name);
+                if (wds_dev) {
+                        dev_put(wds_dev);
+                        return -EEXIST;
+                }
+        }
+
+        wds_dev = ieee80211_if_add(dev, name, locked);
+        if (wds_dev == NULL)
+                return -ENOANO;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(wds_dev);
+        sdata->type = IEEE80211_SUB_IF_TYPE_WDS;
+        memcpy(&sdata->u.wds, wds, sizeof(struct ieee80211_if_wds));
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG
+	       "%s: Added WDS Link to " MACSTR "\n",
+	       wds_dev->name, MAC2STR(sdata->u.wds.remote_addr));
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+
+
+	ieee80211_proc_init_virtual(wds_dev);
+
+        return 0;
+}
+
+
+int ieee80211_if_update_wds(struct net_device *dev, char *name,
+			    struct ieee80211_if_wds *wds, int locked)
+{
+	struct net_device *wds_dev = NULL;
+	struct ieee80211_local *local = dev->priv;
+	struct ieee80211_sub_if_data *sdata = NULL;
+	struct sta_info *sta;
+	struct list_head *ptr;
+
+	list_for_each(ptr, &local->sub_if_list) {
+		sdata = list_entry(ptr, struct ieee80211_sub_if_data, list);
+		if (strcmp(name, sdata->dev->name) == 0) {
+			wds_dev = sdata->dev;
+			break;
+		}
+	}
+
+	if (wds_dev == NULL || sdata->type != IEEE80211_SUB_IF_TYPE_WDS)
+		return -ENODEV;
+
+	/* Remove STA entry for the old peer */
+	sta = sta_info_get(local, sdata->u.wds.remote_addr);
+	if (sta) {
+		sta_info_release(local, sta);
+		sta_info_free(local, sta, 0);
+	} else {
+		printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
+		       "%s peer " MACSTR "\n",
+		       dev->name, wds_dev->name,
+		       MAC2STR(sdata->u.wds.remote_addr));
+	}
+
+	/* Update WDS link data */
+        memcpy(&sdata->u.wds, wds, sizeof(struct ieee80211_if_wds));
+
+
+        return 0;
+}
+
+
+static void ieee80211_if_init(struct net_device *dev)
+{
+        struct ieee80211_local *local = dev->priv;
+
+        spin_lock_init(&local->sub_if_lock);
+        INIT_LIST_HEAD(&local->sub_if_list);
+
+}
+
+
+int ieee80211_if_add_vlan(struct net_device *dev,
+                          char *name,
+                          struct ieee80211_if_vlan *vlan,
+                          int locked)
+{
+        struct net_device *vlan_dev = NULL;
+        struct ieee80211_sub_if_data *sdata = NULL;
+
+        if (strlen(name) != 0) {
+                vlan_dev = dev_get_by_name(name);
+                if (vlan_dev) {
+                        dev_put(vlan_dev);
+                        return -EEXIST;
+                }
+        }
+
+        vlan_dev = ieee80211_if_add(dev, name, locked);
+        if (vlan_dev == NULL)
+                return -ENOANO;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(vlan_dev);
+        sdata->type = IEEE80211_SUB_IF_TYPE_VLAN;
+	ieee80211_proc_init_virtual(vlan_dev);
+        return 0;
+}
+
+
+static void ieee80211_if_norm_init(struct ieee80211_sub_if_data *sdata)
+{
+	sdata->type = IEEE80211_SUB_IF_TYPE_NORM;
+	sdata->u.norm.dtim_period = 2;
+	sdata->u.norm.force_unicast_rateidx = -1;
+	sdata->u.norm.max_ratectrl_rateidx = -1;
+	skb_queue_head_init(&sdata->u.norm.ps_bc_buf);
+	sdata->bss = &sdata->u.norm;
+}
+
+
+int ieee80211_if_add_norm(struct net_device *dev, char *name, u8 *bssid,
+			  int locked)
+{
+        struct ieee80211_local *local = dev->priv;
+        struct net_device *norm_dev = NULL;
+        struct ieee80211_sub_if_data *sdata = NULL;
+
+	if (local->bss_dev_count >= local->conf.bss_count)
+		return -ENOBUFS;
+
+        if (strlen(name) != 0) {
+                norm_dev = dev_get_by_name(name);
+                if (norm_dev) {
+                        dev_put(norm_dev);
+                        return -EEXIST;
+                }
+        }
+
+        norm_dev = ieee80211_if_add(dev, name, locked);
+        if (norm_dev == NULL)
+                return -ENOANO;
+
+	memcpy(norm_dev->dev_addr, bssid, ETH_ALEN);
+	sdata = IEEE80211_DEV_TO_SUB_IF(norm_dev);
+	ieee80211_if_norm_init(sdata);
+	ieee80211_proc_init_virtual(norm_dev);
+	spin_lock_bh(&local->sub_if_lock);
+	local->bss_devs[local->bss_dev_count] = norm_dev;
+	local->bss_dev_count++;
+	spin_unlock_bh(&local->sub_if_lock);
+
+        return 0;
+}
+
+
+static void ieee80211_addr_inc(u8 *addr)
+{
+	int pos = 5;
+	while (pos >= 0) {
+		addr[pos]++;
+		if (addr[pos] != 0)
+			break;
+		pos--;
+	}
+}
+
+
+int ieee80211_if_add_sta(struct net_device *dev, char *name, int locked)
+{
+	struct ieee80211_local *local = dev->priv;
+	struct net_device *sta_dev;
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_if_sta *ifsta;
+	int i;
+
+	if (local->sta_dev_count >= local->conf.bss_count)
+		return -ENOBUFS;
+
+	if (strlen(name) != 0) {
+		sta_dev = dev_get_by_name(name);
+		if (sta_dev) {
+			dev_put(sta_dev);
+			return -EEXIST;
+		}
+	}
+
+	sta_dev = ieee80211_if_add(dev, name, locked);
+	if (sta_dev == NULL)
+		return -ENOANO;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(sta_dev);
+	ifsta = &sdata->u.sta;
+	sdata->type = IEEE80211_SUB_IF_TYPE_STA;
+	ieee80211_proc_init_virtual(sta_dev);
+
+	spin_lock_bh(&local->sub_if_lock);
+	for (i = 0; i < local->conf.bss_count; i++) {
+		if (local->sta_devs[i] == NULL) {
+			local->sta_devs[i] = sta_dev;
+			local->sta_dev_count++;
+			printk(KERN_DEBUG "%s: using STA entry %d\n",
+			       sta_dev->name, i);
+			while (i > 0) {
+				ieee80211_addr_inc(sta_dev->dev_addr);
+				i--;
+			}
+			printk(KERN_DEBUG "%s: MAC address " MACSTR "\n",
+			       sta_dev->name, MAC2STR(sta_dev->dev_addr));
+			break;
+		}
+	}
+	spin_unlock_bh(&local->sub_if_lock);
+
+	init_timer(&ifsta->timer);
+	ifsta->timer.data = (unsigned long) sta_dev;
+	ifsta->timer.function = ieee80211_sta_timer;
+
+	ifsta->capab = WLAN_CAPABILITY_ESS;
+	ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
+		IEEE80211_AUTH_ALG_SHARED_KEY;
+	ifsta->create_ibss = 1;
+	ifsta->wmm_enabled = 1;
+
+	return 0;
+}
+
+
+static void ieee80211_if_del(struct ieee80211_local *local,
+			     struct ieee80211_sub_if_data *sdata, int locked)
+{
+        struct sta_info *sta;
+	u8 addr[ETH_ALEN];
+	int i, j;
+        struct list_head *ptr, *n;
+
+	memset(addr, 0xff, ETH_ALEN);
+	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+		if (!sdata->keys[i])
+			continue;
+#if 0
+		/* Low-level driver has probably disabled hw
+		 * already, so there is not really much point
+		 * in disabling the keys at this point. */
+		if (local->hw->set_key)
+			local->hw->set_key(dev, DISABLE_KEY, addr,
+					   local->keys[i], 0);
+#endif
+		kfree(sdata->keys[i]);
+	}
+
+	switch (sdata->type) {
+	case IEEE80211_SUB_IF_TYPE_NORM:
+		/* Remove all virtual interfaces that use this BSS
+		 * as their sdata->bss */
+		list_for_each_safe(ptr, n, &local->sub_if_list) {
+			struct ieee80211_sub_if_data *tsdata =
+				list_entry(ptr, struct ieee80211_sub_if_data,
+					   list);
+
+			if (tsdata != sdata && tsdata->bss == &sdata->u.norm) {
+				printk(KERN_DEBUG "%s: removing virtual "
+				       "interface %s because its BSS interface"
+				       " is being removed\n",
+				       sdata->dev->name, tsdata->dev->name);
+				ieee80211_if_del(local, tsdata, locked);
+			}
+		}
+
+		kfree(sdata->u.norm.beacon_head);
+		kfree(sdata->u.norm.beacon_tail);
+		spin_lock_bh(&local->sub_if_lock);
+		for (j = 0; j < local->bss_dev_count; j++) {
+			if (sdata->dev == local->bss_devs[j]) {
+				if (j + 1 < local->bss_dev_count) {
+					memcpy(&local->bss_devs[j],
+					       &local->bss_devs[j + 1],
+					       (local->bss_dev_count - j - 1) *
+					       sizeof(local->bss_devs[0]));
+					local->bss_devs[local->bss_dev_count -
+							1] = NULL;
+				} else
+					local->bss_devs[j] = NULL;
+				local->bss_dev_count--;
+				break;
+			}
+		}
+		spin_unlock_bh(&local->sub_if_lock);
+
+		if (sdata->dev != local->mdev) {
+			struct sk_buff *skb;
+			while ((skb = skb_dequeue(&sdata->u.norm.ps_bc_buf))) {
+				local->total_ps_buffered--;
+				dev_kfree_skb(skb);
+			}
+		}
+
+		break;
+	case IEEE80211_SUB_IF_TYPE_WDS:
+		sta = sta_info_get(local, sdata->u.wds.remote_addr);
+		if (sta) {
+			sta_info_release(local, sta);
+			sta_info_free(local, sta, 0);
+		} else {
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+			printk(KERN_DEBUG "%s: Someone had deleted my STA "
+			       "entry for the WDS link\n", sdata->dev->name);
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+		}
+		break;
+	case IEEE80211_SUB_IF_TYPE_STA:
+		del_timer_sync(&sdata->u.sta.timer);
+		if (local->scan_timer.data == (unsigned long) sdata->dev)
+			del_timer_sync(&local->scan_timer);
+		kfree(sdata->u.sta.extra_ie);
+		sdata->u.sta.extra_ie = NULL;
+		kfree(sdata->u.sta.assocreq_ies);
+		sdata->u.sta.assocreq_ies = NULL;
+		kfree(sdata->u.sta.assocresp_ies);
+		sdata->u.sta.assocresp_ies = NULL;
+		if (sdata->u.sta.probe_resp) {
+			dev_kfree_skb(sdata->u.sta.probe_resp);
+			sdata->u.sta.probe_resp = NULL;
+		}
+		for (i = 0; i < local->conf.bss_count; i++) {
+			if (local->sta_devs[i] == sdata->dev) {
+				local->sta_devs[i] = NULL;
+				local->sta_dev_count--;
+				break;
+			}
+		}
+
+		break;
+	}
+
+	/* remove all STAs that are bound to this virtual interface */
+	sta_info_flush(local, sdata->dev);
+
+	list_del(&sdata->list);
+	ieee80211_proc_deinit_virtual(sdata->dev);
+	if (locked)
+		unregister_netdevice(sdata->dev);
+	else
+		unregister_netdev(sdata->dev);
+	/* Default data device and management device are allocated with the
+	 * master device. All other devices are separately allocated and will
+	 * be freed here. */
+	if (sdata->dev != local->mdev && sdata->dev != local->wdev &&
+	    sdata->dev != local->apdev)
+		kfree(sdata->dev);
+}
+
+
+static int ieee80211_if_remove(struct net_device *dev, char *name, int id,
+			       int locked)
+{
+        struct ieee80211_local *local = dev->priv;
+        struct list_head *ptr, *n;
+
+	/* Make sure not to touch sdata->master since it may
+	 * have already been deleted, etc. */
+
+	list_for_each_safe(ptr, n, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+
+		if (sdata->type == id && strcmp(name, sdata->dev->name) == 0) {
+			ieee80211_if_del(local, sdata, locked);
+			break;
+		}
+	}
+
+        return 0;
+}
+
+
+int ieee80211_if_remove_wds(struct net_device *dev, char *name, int locked)
+{
+        return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_WDS,
+				   locked);
+}
+
+
+int ieee80211_if_remove_vlan(struct net_device *dev, char *name, int locked)
+{
+        return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_VLAN,
+				   locked);
+}
+
+
+int ieee80211_if_remove_norm(struct net_device *dev, char *name, int locked)
+{
+	return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_NORM,
+				   locked);
+}
+
+
+int ieee80211_if_remove_sta(struct net_device *dev, char *name, int locked)
+{
+	return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_STA,
+				   locked);
+}
+
+
+int ieee80211_if_flush(struct net_device *dev, int locked)
+{
+        struct ieee80211_local *local = dev->priv;
+        struct list_head *ptr, *n;
+
+	list_for_each_safe(ptr, n, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+
+		if (sdata->dev != local->mdev &&
+		    sdata->dev != local->wdev &&
+		    sdata->dev != local->apdev)
+			ieee80211_if_del(local, sdata, locked);
+	}
+
+        return 0;
+}
+
+
+static void ieee80211_precalc_rates(struct ieee80211_hw *hw)
+{
+	struct ieee80211_hw_modes *mode;
+	struct ieee80211_rate *rate;
+	int m, r;
+
+	for (m = 0; m < hw->num_modes; m++) {
+		mode = &hw->modes[m];
+		for (r = 0; r < mode->num_rates; r++) {
+			rate = &mode->rates[r];
+			rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
+		}
+	}
+}
+
+
+struct net_device *ieee80211_alloc_hw(size_t priv_data_len,
+				      void (*setup)(struct net_device *))
+{
+	struct net_device *dev, *apdev, *mdev;
+        struct ieee80211_local *local;
+        struct ieee80211_sub_if_data *sdata;
+	int alloc_size;
+
+	/* Ensure 32-bit alignment of our private data and hw private data.
+	 * Each net_device is followed by a sub_if_data which which is used
+	 * for wds/vlan information; it is aligned as well.
+	 *
+         * Sample memory map looks something like:
+         *
+         * 0000 *****************
+         *      * net_dev       *
+         * 015c *****************
+         *      * sub_if        *
+         * 017c *****************
+         *      * local         *
+         * 0b84 *****************
+         *      * hw_priv       *
+         * 1664 *****************
+         *      * ap net_dev    *
+         * 17c0 *****************
+         *      * sub_if        *
+	 *      *****************
+	 *      * master net_dev*
+	 *      *****************
+	 *      * sub_if        *
+         *      *****************
+         */
+        alloc_size = sizeof(struct net_device) +
+                sizeof(struct ieee80211_sub_if_data) + 3 +
+                sizeof(struct ieee80211_local) + 3 +
+                priv_data_len + 3 +
+                sizeof(struct net_device) + 3 +
+		sizeof(struct ieee80211_sub_if_data) + 3 +
+                sizeof(struct net_device) + 3 +
+		sizeof(struct ieee80211_sub_if_data) + 3 +
+		4096;
+        mdev = (struct net_device *) kzalloc(alloc_size, GFP_KERNEL);
+	if (mdev == NULL)
+		return NULL;
+
+        mdev->priv = (struct net_device *)
+                (((long) mdev +
+                  sizeof(struct net_device) +
+                  sizeof(struct ieee80211_sub_if_data) + 3)
+                 & ~3);
+	local = mdev->priv;
+	local->hw_priv = (void *)
+                (((long) local + sizeof(struct ieee80211_local) + 3) & ~3);
+	apdev = (struct net_device *)
+		(((long) local->hw_priv + priv_data_len + 3) & ~3);
+        dev = (struct net_device *)
+		(((long) apdev +
+		  sizeof(struct net_device) +
+		  sizeof(struct ieee80211_sub_if_data) + 3)
+                 & ~3);
+        dev->priv = local;
+
+	ether_setup(dev);
+	memcpy(dev->name, "wlan%d", 7);
+
+        dev->hard_start_xmit = ieee80211_subif_start_xmit;
+        dev->do_ioctl = ieee80211_ioctl;
+	dev->change_mtu = ieee80211_change_mtu;
+        dev->tx_timeout = ieee80211_tx_timeout;
+        dev->get_stats = ieee80211_get_stats;
+        dev->open = ieee80211_open;
+        dev->stop = ieee80211_stop;
+	dev->tx_queue_len = 0;
+	dev->set_mac_address = ieee80211_set_mac_address;
+
+        local->wdev = dev;
+	local->mdev = mdev;
+        local->rx_handlers = ieee80211_rx_handlers;
+        local->tx_handlers = ieee80211_tx_handlers;
+
+	local->bridge_packets = 1;
+
+	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
+	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
+	local->short_retry_limit = 7;
+	local->long_retry_limit = 4;
+	local->conf.calib_int = 60;
+	local->rate_ctrl_num_up = RATE_CONTROL_NUM_UP;
+	local->rate_ctrl_num_down = RATE_CONTROL_NUM_DOWN;
+	local->conf.bss_count = 1;
+	memset(local->conf.bssid_mask, 0xff, ETH_ALEN);
+	local->bss_devs = kmalloc(sizeof(struct net_device *), GFP_KERNEL);
+	if (local->bss_devs == NULL)
+		goto fail;
+	local->bss_devs[0] = local->wdev;
+	local->bss_dev_count = 1;
+	local->sta_devs = kmalloc(sizeof(struct net_device *), GFP_KERNEL);
+	if (local->sta_devs == NULL)
+		goto fail;
+	local->sta_devs[0] = NULL;
+
+        local->scan.in_scan = 0;
+	local->hw_modes = (unsigned int) -1;
+
+        init_timer(&local->scan.timer); /* clear it out */
+
+        spin_lock_init(&local->generic_lock);
+	init_timer(&local->rate_limit_timer);
+	local->rate_limit_timer.function = ieee80211_rate_limit;
+	local->rate_limit_timer.data = (unsigned long) local;
+	init_timer(&local->stat_timer);
+	local->stat_timer.function = ieee80211_stat_refresh;
+	local->stat_timer.data = (unsigned long) local;
+	ieee80211_rx_bss_list_init(dev);
+
+        sta_info_init(local);
+
+        ieee80211_if_init(dev);
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        sdata->dev = dev;
+        sdata->master = mdev;
+        sdata->local = local;
+	ieee80211_if_sdata_init(sdata);
+	ieee80211_if_norm_init(sdata);
+	list_add_tail(&sdata->list, &local->sub_if_list);
+
+	if (strlen(dev->name) + 2 >= sizeof(dev->name))
+		goto fail;
+
+        apdev = (struct net_device *)
+                (((long) local->hw_priv + priv_data_len + 3) & ~3);
+        local->apdev = apdev;
+	ether_setup(apdev);
+	apdev->priv = local;
+	apdev->hard_start_xmit = ieee80211_mgmt_start_xmit;
+	apdev->change_mtu = ieee80211_change_mtu_apdev;
+	apdev->get_stats = ieee80211_get_stats;
+        apdev->open = ieee80211_open;
+        apdev->stop = ieee80211_stop;
+	apdev->type = ARPHRD_IEEE80211_PRISM;
+        apdev->hard_header_parse = header_parse_80211;
+	apdev->tx_queue_len = 0;
+	sprintf(apdev->name, "%sap", dev->name);
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(apdev);
+        sdata->type = IEEE80211_SUB_IF_TYPE_MGMT;
+        sdata->dev = apdev;
+        sdata->master = mdev;
+        sdata->local = local;
+        list_add_tail(&sdata->list, &local->sub_if_list);
+
+	ether_setup(mdev);
+	mdev->hard_start_xmit = ieee80211_master_start_xmit;
+        mdev->do_ioctl = ieee80211_ioctl;
+	mdev->change_mtu = ieee80211_change_mtu;
+        mdev->tx_timeout = ieee80211_tx_timeout;
+        mdev->get_stats = ieee80211_get_stats;
+        mdev->open = ieee80211_open;
+	mdev->stop = ieee80211_stop;
+	mdev->type = ARPHRD_IEEE80211;
+        mdev->hard_header_parse = header_parse_80211;
+	sprintf(mdev->name, "%s.11", dev->name);
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
+        sdata->type = IEEE80211_SUB_IF_TYPE_NORM;
+        sdata->dev = mdev;
+        sdata->master = mdev;
+        sdata->local = local;
+        list_add_tail(&sdata->list, &local->sub_if_list);
+
+        tasklet_init(&local->tasklet,
+		     ieee80211_tasklet_handler,
+		     (unsigned long) local);
+        skb_queue_head_init(&local->skb_queue);
+        skb_queue_head_init(&local->skb_queue_unreliable);
+
+	if (setup)
+		setup(mdev);
+
+	return mdev;
+
+ fail:
+	ieee80211_free_hw(mdev);
+	return NULL;
+}
+
+int ieee80211_register_hw(struct net_device *dev, struct ieee80211_hw *hw)
+{
+        struct ieee80211_local *local = dev->priv;
+	int result;
+
+	if (!hw)
+		return -1;
+
+	if (hw->version != IEEE80211_VERSION) {
+		printk("ieee80211_register_hw - version mismatch: 80211.o "
+		       "version %d, low-level driver version %d\n",
+		       IEEE80211_VERSION, hw->version);
+		return -1;
+	}
+
+	local->conf.mode = IW_MODE_MASTER;
+	local->conf.beacon_int = 1000;
+
+	ieee80211_update_hw(dev, hw);	/* Don't care about the result. */
+
+	sta_info_start(local);
+
+	result = register_netdev(local->wdev);
+	if (result < 0)
+		return -1;
+
+	result = register_netdev(local->apdev);
+	if (result < 0)
+		goto fail_2nd_dev;
+
+	if (hw->fraglist)
+		dev->features |= NETIF_F_FRAGLIST;
+	result = register_netdev(dev);
+	if (result < 0)
+		goto fail_3rd_dev;
+
+	if (rate_control_initialize(local) < 0) {
+		printk(KERN_DEBUG "%s: Failed to initialize rate control "
+		       "algorithm\n", dev->name);
+		goto fail_rate;
+	}
+
+	/* TODO: add rtnl locking around device creation and qdisc install */
+	ieee80211_install_qdisc(dev);
+
+        ieee80211_wep_init(local);
+	ieee80211_proc_init_interface(local);
+	return 0;
+
+fail_rate:
+	unregister_netdev(dev);
+fail_3rd_dev:
+	unregister_netdev(local->apdev);
+fail_2nd_dev:
+	unregister_netdev(local->wdev);
+	sta_info_stop(local);
+	return result;
+}
+
+int ieee80211_update_hw(struct net_device *dev, struct ieee80211_hw *hw)
+{
+        struct ieee80211_local *local = dev->priv;
+
+	local->hw = hw;
+
+	/* Backwards compatibility for low-level drivers that do not set number
+	 * of TX queues. */
+	if (hw->queues == 0)
+		hw->queues = 1;
+
+	memcpy(local->apdev->dev_addr, dev->dev_addr, ETH_ALEN);
+	local->apdev->base_addr = dev->base_addr;
+	local->apdev->irq = dev->irq;
+	local->apdev->mem_start = dev->mem_start;
+	local->apdev->mem_end = dev->mem_end;
+
+        memcpy(local->wdev->dev_addr, dev->dev_addr, ETH_ALEN);
+	local->wdev->base_addr = dev->base_addr;
+	local->wdev->irq = dev->irq;
+	local->wdev->mem_start = dev->mem_start;
+	local->wdev->mem_end = dev->mem_end;
+
+	if (!hw->modes || !hw->modes->channels || !hw->modes->rates ||
+	    !hw->modes->num_channels || !hw->modes->num_rates)
+		return -1;
+
+	ieee80211_precalc_rates(hw);
+	local->conf.phymode = hw->modes[0].mode;
+	local->curr_rates = hw->modes[0].rates;
+	local->num_curr_rates = hw->modes[0].num_rates;
+	ieee80211_prepare_rates(dev);
+
+	local->conf.freq = local->hw->modes[0].channels[0].freq;
+	local->conf.channel = local->hw->modes[0].channels[0].chan;
+	local->conf.channel_val = local->hw->modes[0].channels[0].val;
+	/* FIXME: Invoke config to allow driver to set the channel. */
+
+	return 0;
+}
+
+void ieee80211_unregister_hw(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+        struct list_head *ptr, *n;
+	int i;
+
+        tasklet_disable(&local->tasklet);
+        /* TODO: skb_queue should be empty here, no need to do anything? */
+
+	if (local->rate_limit)
+		del_timer_sync(&local->rate_limit_timer);
+	if (local->stat_time)
+		del_timer_sync(&local->stat_timer);
+	if (local->scan_timer.data)
+		del_timer_sync(&local->scan_timer);
+	ieee80211_rx_bss_list_deinit(dev);
+
+	list_for_each_safe(ptr, n, &local->sub_if_list) {
+		struct ieee80211_sub_if_data *sdata =
+			list_entry(ptr, struct ieee80211_sub_if_data, list);
+		ieee80211_if_del(local, sdata, 0);
+	}
+
+	sta_info_stop(local);
+
+	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
+		if (local->fragments[i].skb)
+			dev_kfree_skb(local->fragments[i].skb);
+
+	for (i = 0; i < NUM_IEEE80211_MODES; i++) {
+		kfree(local->supp_rates[i]);
+		kfree(local->basic_rates[i]);
+        }
+
+	kfree(local->conf.ssid);
+	kfree(local->conf.generic_elem);
+
+	ieee80211_proc_deinit_interface(local);
+
+	skb_queue_purge(&local->skb_queue);
+	skb_queue_purge(&local->skb_queue_unreliable);
+
+	rate_control_free(local);
+}
+
+void ieee80211_free_hw(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+
+	kfree(local->sta_devs);
+	kfree(local->bss_devs);
+	kfree(dev);
+}
+
+/* Perform netif operations on all configured interfaces */
+int ieee80211_netif_oper(struct net_device *sdev, Netif_Oper op)
+{
+        struct ieee80211_local *local = sdev->priv;
+        struct ieee80211_sub_if_data *sdata =  IEEE80211_DEV_TO_SUB_IF(sdev);
+        struct net_device *dev = sdata->master;
+
+        switch (op) {
+        case NETIF_ATTACH:
+            netif_device_attach(dev);
+            break;
+        case NETIF_DETACH:
+            netif_device_detach(dev);
+            break;
+        case NETIF_START:
+            netif_start_queue(dev);
+            break;
+        case NETIF_STOP:
+            break;
+        case NETIF_WAKE:
+		if (local->scan.in_scan == 0) {
+			netif_wake_queue(dev);
+#if 1
+			if (/* FIX: 802.11 qdisc in use */ 1)
+				__netif_schedule(dev);
+#endif
+		}
+            break;
+        case NETIF_IS_STOPPED:
+            if (netif_queue_stopped(dev))
+                return 1;
+            break;
+        case NETIF_UPDATE_TX_START:
+            dev->trans_start = jiffies;
+            break;
+        }
+
+        return 0;
+}
+
+
+void * ieee80211_dev_hw_data(struct net_device *dev)
+{
+	struct ieee80211_local *local = dev->priv;
+	return local->hw_priv;
+}
+
+
+void * ieee80211_dev_stats(struct net_device *dev)
+{
+	struct ieee80211_sub_if_data *sdata;
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	return &(sdata->stats);
+}
+
+
+int ieee80211_rate_control_register(struct rate_control_ops *ops)
+{
+	struct rate_control_algs *alg;
+
+	alg = kmalloc(sizeof(*alg), GFP_KERNEL);
+	if (alg == NULL) {
+		return -1;
+	}
+	memset(alg, 0, sizeof(*alg));
+	alg->next = ieee80211_rate_ctrl_algs;
+	alg->ops = ops;
+	ieee80211_rate_ctrl_algs = alg;
+
+	return 0;
+}
+
+
+void ieee80211_rate_control_unregister(struct rate_control_ops *ops)
+{
+	struct rate_control_algs *alg, *prev;
+
+	prev = NULL;
+	alg = ieee80211_rate_ctrl_algs;
+	while (alg) {
+		if (alg->ops == ops) {
+			if (prev)
+				prev->next = alg->next;
+			else
+				ieee80211_rate_ctrl_algs = alg->next;
+			kfree(alg);
+			break;
+		}
+		prev = alg;
+		alg = alg->next;
+	}
+}
+
+
+static int rate_control_initialize(struct ieee80211_local *local)
+{
+	struct rate_control_algs *algs;
+	for (algs = ieee80211_rate_ctrl_algs; algs; algs = algs->next) {
+		local->rate_ctrl = algs->ops;
+		local->rate_ctrl_priv = rate_control_alloc(local);
+		if (local->rate_ctrl_priv) {
+			printk(KERN_DEBUG "%s: Selected rate control "
+			       "algorithm '%s'\n", local->wdev->name,
+			       local->rate_ctrl->name);
+			return 0;
+		}
+	}
+
+	printk(KERN_WARNING "%s: Failed to select rate control algorithm\n",
+	       local->wdev->name);
+	return -1;
+}
+
+
+static int __init ieee80211_init(void)
+{
+	struct sk_buff *skb;
+	if (sizeof(struct ieee80211_tx_packet_data) > (sizeof(skb->cb))) {
+		printk("80211: ieee80211_tx_packet_data is bigger "
+		       "than the skb->cb (%d > %d)\n",
+		       (int) sizeof(struct ieee80211_tx_packet_data),
+		       (int) sizeof(skb->cb));
+		return -EINVAL;
+	}
+	if (sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)) {
+		printk("80211: ieee80211_rx_status is bigger "
+		       "than the skb->cb (%d > %d)\n",
+		       (int) sizeof(struct ieee80211_rx_status),
+		       (int) sizeof(skb->cb));
+		return -EINVAL;
+	}
+
+	ieee80211_proc_init();
+	{
+		int ret = ieee80211_wme_register();
+		if (ret) {
+			printk(KERN_DEBUG "ieee80211_init: failed to "
+			       "initialize WME (err=%d)\n", ret);
+			ieee80211_proc_deinit();
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+
+static void __exit ieee80211_exit(void)
+{
+	ieee80211_wme_unregister();
+	ieee80211_proc_deinit();
+}
+
+
+EXPORT_SYMBOL(ieee80211_alloc_hw);
+EXPORT_SYMBOL(ieee80211_register_hw);
+EXPORT_SYMBOL(ieee80211_update_hw);
+EXPORT_SYMBOL(ieee80211_unregister_hw);
+EXPORT_SYMBOL(ieee80211_free_hw);
+EXPORT_SYMBOL(ieee80211_rx);
+EXPORT_SYMBOL(ieee80211_tx_status);
+EXPORT_SYMBOL(ieee80211_beacon_get);
+EXPORT_SYMBOL(ieee80211_get_buffered_bc);
+EXPORT_SYMBOL(ieee80211_netif_oper);
+EXPORT_SYMBOL(ieee80211_dev_hw_data);
+EXPORT_SYMBOL(ieee80211_dev_stats);
+EXPORT_SYMBOL(ieee80211_get_hw_conf);
+EXPORT_SYMBOL(ieee80211_set_aid_for_sta);
+EXPORT_SYMBOL(ieee80211_rx_irqsafe);
+EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
+EXPORT_SYMBOL(ieee80211_get_hdrlen);
+EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
+EXPORT_SYMBOL(ieee80211_rate_control_register);
+EXPORT_SYMBOL(ieee80211_rate_control_unregister);
+EXPORT_SYMBOL(sta_info_get);
+EXPORT_SYMBOL(sta_info_release);
+EXPORT_SYMBOL(ieee80211_radar_status);
+
+module_init(ieee80211_init);
+module_exit(ieee80211_exit);