Add HostAP wireless driver.

Includes minor cleanups from Adrian Bunk <bunk@stusta.de>.

1 files changed, 1084 insertions, 0 deletions

diff --git a/drivers/net/wireless/hostap/hostap_80211_rx.c b/drivers/net/wireless/hostap/hostap_80211_rx.c
new file mode 100644
index 00000000000..917296c4fcb
--- /dev/null
+++ b/drivers/net/wireless/hostap/hostap_80211_rx.c
@@ -0,0 +1,1084 @@
+#include <linux/etherdevice.h>
+
+#include "hostap_80211.h"
+#include "hostap.h"
+
+void hostap_dump_rx_80211(const char *name, struct sk_buff *skb,
+			  struct hostap_80211_rx_status *rx_stats)
+{
+	struct hostap_ieee80211_hdr *hdr;
+	u16 fc;
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+
+	printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d "
+	       "jiffies=%ld\n",
+	       name, rx_stats->signal, rx_stats->noise, rx_stats->rate,
+	       skb->len, jiffies);
+
+	if (skb->len < 2)
+		return;
+
+	fc = le16_to_cpu(hdr->frame_control);
+	printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
+	       fc, WLAN_FC_GET_TYPE(fc), WLAN_FC_GET_STYPE(fc),
+	       fc & WLAN_FC_TODS ? " [ToDS]" : "",
+	       fc & WLAN_FC_FROMDS ? " [FromDS]" : "");
+
+	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
+		printk("\n");
+		return;
+	}
+
+	printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
+	       le16_to_cpu(hdr->seq_ctrl));
+
+	printk(KERN_DEBUG "   A1=" MACSTR " A2=" MACSTR " A3=" MACSTR,
+	       MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), MAC2STR(hdr->addr3));
+	if (skb->len >= 30)
+		printk(" A4=" MACSTR, MAC2STR(hdr->addr4));
+	printk("\n");
+}
+
+
+/* Send RX frame to netif with 802.11 (and possible prism) header.
+ * Called from hardware or software IRQ context. */
+int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb,
+		    struct hostap_80211_rx_status *rx_stats, int type)
+{
+	struct hostap_interface *iface;
+	local_info_t *local;
+	int hdrlen, phdrlen, head_need, tail_need;
+	u16 fc;
+	int prism_header, ret;
+	struct hostap_ieee80211_hdr *hdr;
+
+	iface = netdev_priv(dev);
+	local = iface->local;
+	dev->last_rx = jiffies;
+
+	if (dev->type == ARPHRD_IEEE80211_PRISM) {
+		if (local->monitor_type == PRISM2_MONITOR_PRISM) {
+			prism_header = 1;
+			phdrlen = sizeof(struct linux_wlan_ng_prism_hdr);
+		} else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */
+			prism_header = 2;
+			phdrlen = sizeof(struct linux_wlan_ng_cap_hdr);
+		}
+	} else {
+		prism_header = 0;
+		phdrlen = 0;
+	}
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	fc = le16_to_cpu(hdr->frame_control);
+
+	if (type == PRISM2_RX_MGMT && (fc & WLAN_FC_PVER)) {
+		printk(KERN_DEBUG "%s: dropped management frame with header "
+		       "version %d\n", dev->name, fc & WLAN_FC_PVER);
+		dev_kfree_skb_any(skb);
+		return 0;
+	}
+
+	hdrlen = hostap_80211_get_hdrlen(fc);
+
+	/* check if there is enough room for extra data; if not, expand skb
+	 * buffer to be large enough for the changes */
+	head_need = phdrlen;
+	tail_need = 0;
+#ifdef PRISM2_ADD_BOGUS_CRC
+	tail_need += 4;
+#endif /* PRISM2_ADD_BOGUS_CRC */
+
+	head_need -= skb_headroom(skb);
+	tail_need -= skb_tailroom(skb);
+
+	if (head_need > 0 || tail_need > 0) {
+		if (pskb_expand_head(skb, head_need > 0 ? head_need : 0,
+				     tail_need > 0 ? tail_need : 0,
+				     GFP_ATOMIC)) {
+			printk(KERN_DEBUG "%s: prism2_rx_80211 failed to "
+			       "reallocate skb buffer\n", dev->name);
+			dev_kfree_skb_any(skb);
+			return 0;
+		}
+	}
+
+	/* We now have an skb with enough head and tail room, so just insert
+	 * the extra data */
+
+#ifdef PRISM2_ADD_BOGUS_CRC
+	memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */
+#endif /* PRISM2_ADD_BOGUS_CRC */
+
+	if (prism_header == 1) {
+		struct linux_wlan_ng_prism_hdr *hdr;
+		hdr = (struct linux_wlan_ng_prism_hdr *)
+			skb_push(skb, phdrlen);
+		memset(hdr, 0, phdrlen);
+		hdr->msgcode = LWNG_CAP_DID_BASE;
+		hdr->msglen = sizeof(*hdr);
+		memcpy(hdr->devname, dev->name, sizeof(hdr->devname));
+#define LWNG_SETVAL(f,i,s,l,d) \
+hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \
+hdr->f.status = s; hdr->f.len = l; hdr->f.data = d
+		LWNG_SETVAL(hosttime, 1, 0, 4, jiffies);
+		LWNG_SETVAL(mactime, 2, 0, 0, rx_stats->mac_time);
+		LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0);
+		LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0);
+		LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0);
+		LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal);
+		LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise);
+		LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5);
+		LWNG_SETVAL(istx, 9, 0, 4, 0);
+		LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen);
+#undef LWNG_SETVAL
+	} else if (prism_header == 2) {
+		struct linux_wlan_ng_cap_hdr *hdr;
+		hdr = (struct linux_wlan_ng_cap_hdr *)
+			skb_push(skb, phdrlen);
+		memset(hdr, 0, phdrlen);
+		hdr->version    = htonl(LWNG_CAPHDR_VERSION);
+		hdr->length     = htonl(phdrlen);
+		hdr->mactime    = __cpu_to_be64(rx_stats->mac_time);
+		hdr->hosttime   = __cpu_to_be64(jiffies);
+		hdr->phytype    = htonl(4); /* dss_dot11_b */
+		hdr->channel    = htonl(local->channel);
+		hdr->datarate   = htonl(rx_stats->rate);
+		hdr->antenna    = htonl(0); /* unknown */
+		hdr->priority   = htonl(0); /* unknown */
+		hdr->ssi_type   = htonl(3); /* raw */
+		hdr->ssi_signal = htonl(rx_stats->signal);
+		hdr->ssi_noise  = htonl(rx_stats->noise);
+		hdr->preamble   = htonl(0); /* unknown */
+		hdr->encoding   = htonl(1); /* cck */
+	}
+
+	ret = skb->len - phdrlen;
+	skb->dev = dev;
+	skb->mac.raw = skb->data;
+	skb_pull(skb, hdrlen);
+	if (prism_header)
+		skb_pull(skb, phdrlen);
+	skb->pkt_type = PACKET_OTHERHOST;
+	skb->protocol = __constant_htons(ETH_P_802_2);
+	memset(skb->cb, 0, sizeof(skb->cb));
+	netif_rx(skb);
+
+	return ret;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static void monitor_rx(struct net_device *dev, struct sk_buff *skb,
+		       struct hostap_80211_rx_status *rx_stats)
+{
+	struct net_device_stats *stats;
+	int len;
+
+	len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR);
+	stats = hostap_get_stats(dev);
+	stats->rx_packets++;
+	stats->rx_bytes += len;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static struct prism2_frag_entry *
+prism2_frag_cache_find(local_info_t *local, unsigned int seq,
+		       unsigned int frag, u8 *src, u8 *dst)
+{
+	struct prism2_frag_entry *entry;
+	int i;
+
+	for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) {
+		entry = &local->frag_cache[i];
+		if (entry->skb != NULL &&
+		    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
+			printk(KERN_DEBUG "%s: expiring fragment cache entry "
+			       "seq=%u last_frag=%u\n",
+			       local->dev->name, entry->seq, entry->last_frag);
+			dev_kfree_skb(entry->skb);
+			entry->skb = NULL;
+		}
+
+		if (entry->skb != NULL && entry->seq == seq &&
+		    (entry->last_frag + 1 == frag || frag == -1) &&
+		    memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
+		    memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
+			return entry;
+	}
+
+	return NULL;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static struct sk_buff *
+prism2_frag_cache_get(local_info_t *local, struct hostap_ieee80211_hdr *hdr)
+{
+	struct sk_buff *skb = NULL;
+	u16 sc;
+	unsigned int frag, seq;
+	struct prism2_frag_entry *entry;
+
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	frag = WLAN_GET_SEQ_FRAG(sc);
+	seq = WLAN_GET_SEQ_SEQ(sc);
+
+	if (frag == 0) {
+		/* Reserve enough space to fit maximum frame length */
+		skb = dev_alloc_skb(local->dev->mtu +
+				    sizeof(struct hostap_ieee80211_hdr) +
+				    8 /* LLC */ +
+				    2 /* alignment */ +
+				    8 /* WEP */ + ETH_ALEN /* WDS */);
+		if (skb == NULL)
+			return NULL;
+
+		entry = &local->frag_cache[local->frag_next_idx];
+		local->frag_next_idx++;
+		if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN)
+			local->frag_next_idx = 0;
+
+		if (entry->skb != NULL)
+			dev_kfree_skb(entry->skb);
+
+		entry->first_frag_time = jiffies;
+		entry->seq = seq;
+		entry->last_frag = frag;
+		entry->skb = skb;
+		memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
+		memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
+	} else {
+		/* received a fragment of a frame for which the head fragment
+		 * should have already been received */
+		entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2,
+					       hdr->addr1);
+		if (entry != NULL) {
+			entry->last_frag = frag;
+			skb = entry->skb;
+		}
+	}
+
+	return skb;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static int prism2_frag_cache_invalidate(local_info_t *local,
+					struct hostap_ieee80211_hdr *hdr)
+{
+	u16 sc;
+	unsigned int seq;
+	struct prism2_frag_entry *entry;
+
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	seq = WLAN_GET_SEQ_SEQ(sc);
+
+	entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1);
+
+	if (entry == NULL) {
+		printk(KERN_DEBUG "%s: could not invalidate fragment cache "
+		       "entry (seq=%u)\n",
+		       local->dev->name, seq);
+		return -1;
+	}
+
+	entry->skb = NULL;
+	return 0;
+}
+
+
+static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid,
+						u8 *ssid, size_t ssid_len)
+{
+	struct list_head *ptr;
+	struct hostap_bss_info *bss;
+
+	list_for_each(ptr, &local->bss_list) {
+		bss = list_entry(ptr, struct hostap_bss_info, list);
+		if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
+		    (ssid == NULL ||
+		     (ssid_len == bss->ssid_len &&
+		      memcmp(ssid, bss->ssid, ssid_len) == 0))) {
+			list_move(&bss->list, &local->bss_list);
+			return bss;
+		}
+	}
+
+	return NULL;
+}
+
+
+static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid,
+						u8 *ssid, size_t ssid_len)
+{
+	struct hostap_bss_info *bss;
+
+	if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) {
+		bss = list_entry(local->bss_list.prev,
+				 struct hostap_bss_info, list);
+		list_del(&bss->list);
+		local->num_bss_info--;
+	} else {
+		bss = (struct hostap_bss_info *)
+			kmalloc(sizeof(*bss), GFP_ATOMIC);
+		if (bss == NULL)
+			return NULL;
+	}
+
+	memset(bss, 0, sizeof(*bss));
+	memcpy(bss->bssid, bssid, ETH_ALEN);
+	memcpy(bss->ssid, ssid, ssid_len);
+	bss->ssid_len = ssid_len;
+	local->num_bss_info++;
+	list_add(&bss->list, &local->bss_list);
+	return bss;
+}
+
+
+static void __hostap_expire_bss(local_info_t *local)
+{
+	struct hostap_bss_info *bss;
+
+	while (local->num_bss_info > 0) {
+		bss = list_entry(local->bss_list.prev,
+				 struct hostap_bss_info, list);
+		if (!time_after(jiffies, bss->last_update + 60 * HZ))
+			break;
+
+		list_del(&bss->list);
+		local->num_bss_info--;
+		kfree(bss);
+	}
+}
+
+
+/* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so
+ * the same routine can be used to parse both of them. */
+static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb,
+				 int stype)
+{
+	struct hostap_ieee80211_mgmt *mgmt;
+	int left, chan = 0;
+	u8 *pos;
+	u8 *ssid = NULL, *wpa = NULL, *rsn = NULL;
+	size_t ssid_len = 0, wpa_len = 0, rsn_len = 0;
+	struct hostap_bss_info *bss;
+
+	if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon))
+		return;
+
+	mgmt = (struct hostap_ieee80211_mgmt *) skb->data;
+	pos = mgmt->u.beacon.variable;
+	left = skb->len - (pos - skb->data);
+
+	while (left >= 2) {
+		if (2 + pos[1] > left)
+			return; /* parse failed */
+		switch (*pos) {
+		case WLAN_EID_SSID:
+			ssid = pos + 2;
+			ssid_len = pos[1];
+			break;
+		case WLAN_EID_GENERIC:
+			if (pos[1] >= 4 &&
+			    pos[2] == 0x00 && pos[3] == 0x50 &&
+			    pos[4] == 0xf2 && pos[5] == 1) {
+				wpa = pos;
+				wpa_len = pos[1] + 2;
+			}
+			break;
+		case WLAN_EID_RSN:
+			rsn = pos;
+			rsn_len = pos[1] + 2;
+			break;
+		case WLAN_EID_DS_PARAMS:
+			if (pos[1] >= 1)
+				chan = pos[2];
+			break;
+		}
+		left -= 2 + pos[1];
+		pos += 2 + pos[1];
+	}
+
+	if (wpa_len > MAX_WPA_IE_LEN)
+		wpa_len = MAX_WPA_IE_LEN;
+	if (rsn_len > MAX_WPA_IE_LEN)
+		rsn_len = MAX_WPA_IE_LEN;
+	if (ssid_len > sizeof(bss->ssid))
+		ssid_len = sizeof(bss->ssid);
+
+	spin_lock(&local->lock);
+	bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len);
+	if (bss == NULL)
+		bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len);
+	if (bss) {
+		bss->last_update = jiffies;
+		bss->count++;
+		bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info);
+		if (wpa) {
+			memcpy(bss->wpa_ie, wpa, wpa_len);
+			bss->wpa_ie_len = wpa_len;
+		} else
+			bss->wpa_ie_len = 0;
+		if (rsn) {
+			memcpy(bss->rsn_ie, rsn, rsn_len);
+			bss->rsn_ie_len = rsn_len;
+		} else
+			bss->rsn_ie_len = 0;
+		bss->chan = chan;
+	}
+	__hostap_expire_bss(local);
+	spin_unlock(&local->lock);
+}
+
+
+static inline int
+hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb,
+		     struct hostap_80211_rx_status *rx_stats, u16 type,
+		     u16 stype)
+{
+	if (local->iw_mode == IW_MODE_MASTER) {
+		hostap_update_sta_ps(local, (struct hostap_ieee80211_hdr *)
+				     skb->data);
+	}
+
+	if (local->hostapd && type == WLAN_FC_TYPE_MGMT) {
+		if (stype == WLAN_FC_STYPE_BEACON &&
+		    local->iw_mode == IW_MODE_MASTER) {
+			struct sk_buff *skb2;
+			/* Process beacon frames also in kernel driver to
+			 * update STA(AP) table statistics */
+			skb2 = skb_clone(skb, GFP_ATOMIC);
+			if (skb2)
+				hostap_rx(skb2->dev, skb2, rx_stats);
+		}
+
+		/* send management frames to the user space daemon for
+		 * processing */
+		local->apdevstats.rx_packets++;
+		local->apdevstats.rx_bytes += skb->len;
+		if (local->apdev == NULL)
+			return -1;
+		prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT);
+		return 0;
+	}
+
+	if (local->iw_mode == IW_MODE_MASTER) {
+		if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
+			printk(KERN_DEBUG "%s: unknown management frame "
+			       "(type=0x%02x, stype=0x%02x) dropped\n",
+			       skb->dev->name, type, stype);
+			return -1;
+		}
+
+		hostap_rx(skb->dev, skb, rx_stats);
+		return 0;
+	} else if (type == WLAN_FC_TYPE_MGMT &&
+		   (stype == WLAN_FC_STYPE_BEACON ||
+		    stype == WLAN_FC_STYPE_PROBE_RESP)) {
+		hostap_rx_sta_beacon(local, skb, stype);
+		return -1;
+	} else if (type == WLAN_FC_TYPE_MGMT &&
+		   (stype == WLAN_FC_STYPE_ASSOC_RESP ||
+		    stype == WLAN_FC_STYPE_REASSOC_RESP)) {
+		/* Ignore (Re)AssocResp silently since these are not currently
+		 * needed but are still received when WPA/RSN mode is enabled.
+		 */
+		return -1;
+	} else {
+		printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled"
+		       " management frame in non-Host AP mode (type=%d:%d)\n",
+		       skb->dev->name, type, stype);
+		return -1;
+	}
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static inline struct net_device *prism2_rx_get_wds(local_info_t *local,
+						   u8 *addr)
+{
+	struct hostap_interface *iface = NULL;
+	struct list_head *ptr;
+
+	read_lock_bh(&local->iface_lock);
+	list_for_each(ptr, &local->hostap_interfaces) {
+		iface = list_entry(ptr, struct hostap_interface, list);
+		if (iface->type == HOSTAP_INTERFACE_WDS &&
+		    memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0)
+			break;
+		iface = NULL;
+	}
+	read_unlock_bh(&local->iface_lock);
+
+	return iface ? iface->dev : NULL;
+}
+
+
+static inline int
+hostap_rx_frame_wds(local_info_t *local, struct hostap_ieee80211_hdr *hdr,
+		    u16 fc, struct net_device **wds)
+{
+	/* FIX: is this really supposed to accept WDS frames only in Master
+	 * mode? What about Repeater or Managed with WDS frames? */
+	if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) !=
+	    (WLAN_FC_TODS | WLAN_FC_FROMDS) &&
+	    (local->iw_mode != IW_MODE_MASTER || !(fc & WLAN_FC_TODS)))
+		return 0; /* not a WDS frame */
+
+	/* Possible WDS frame: either IEEE 802.11 compliant (if FromDS)
+	 * or own non-standard frame with 4th address after payload */
+	if (memcmp(hdr->addr1, local->dev->dev_addr, ETH_ALEN) != 0 &&
+	    (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff ||
+	     hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff ||
+	     hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) {
+		/* RA (or BSSID) is not ours - drop */
+		PDEBUG(DEBUG_EXTRA, "%s: received WDS frame with "
+		       "not own or broadcast %s=" MACSTR "\n",
+		       local->dev->name, fc & WLAN_FC_FROMDS ? "RA" : "BSSID",
+		       MAC2STR(hdr->addr1));
+		return -1;
+	}
+
+	/* check if the frame came from a registered WDS connection */
+	*wds = prism2_rx_get_wds(local, hdr->addr2);
+	if (*wds == NULL && fc & WLAN_FC_FROMDS &&
+	    (local->iw_mode != IW_MODE_INFRA ||
+	     !(local->wds_type & HOSTAP_WDS_AP_CLIENT) ||
+	     memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) {
+		/* require that WDS link has been registered with TA or the
+		 * frame is from current AP when using 'AP client mode' */
+		PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame "
+		       "from unknown TA=" MACSTR "\n",
+		       local->dev->name, MAC2STR(hdr->addr2));
+		if (local->ap && local->ap->autom_ap_wds)
+			hostap_wds_link_oper(local, hdr->addr2, WDS_ADD);
+		return -1;
+	}
+
+	if (*wds && !(fc & WLAN_FC_FROMDS) && local->ap &&
+	    hostap_is_sta_assoc(local->ap, hdr->addr2)) {
+		/* STA is actually associated with us even though it has a
+		 * registered WDS link. Assume it is in 'AP client' mode.
+		 * Since this is a 3-addr frame, assume it is not (bogus) WDS
+		 * frame and process it like any normal ToDS frame from
+		 * associated STA. */
+		*wds = NULL;
+	}
+
+	return 0;
+}
+
+
+static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb)
+{
+	struct net_device *dev = local->dev;
+	u16 fc, ethertype;
+	struct hostap_ieee80211_hdr *hdr;
+	u8 *pos;
+
+	if (skb->len < 24)
+		return 0;
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	fc = le16_to_cpu(hdr->frame_control);
+
+	/* check that the frame is unicast frame to us */
+	if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == WLAN_FC_TODS &&
+	    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
+	    memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
+		/* ToDS frame with own addr BSSID and DA */
+	} else if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == WLAN_FC_FROMDS &&
+		   memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
+		/* FromDS frame with own addr as DA */
+	} else
+		return 0;
+
+	if (skb->len < 24 + 8)
+		return 0;
+
+	/* check for port access entity Ethernet type */
+	pos = skb->data + 24;
+	ethertype = (pos[6] << 8) | pos[7];
+	if (ethertype == ETH_P_PAE)
+		return 1;
+
+	return 0;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static inline int
+hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
+			struct prism2_crypt_data *crypt)
+{
+	struct hostap_ieee80211_hdr *hdr;
+	int res, hdrlen;
+
+	if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
+		return 0;
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+
+	if (local->tkip_countermeasures &&
+	    strcmp(crypt->ops->name, "TKIP") == 0) {
+		if (net_ratelimit()) {
+			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
+			       "received packet from " MACSTR "\n",
+			       local->dev->name, MAC2STR(hdr->addr2));
+		}
+		return -1;
+	}
+
+	atomic_inc(&crypt->refcnt);
+	res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
+	atomic_dec(&crypt->refcnt);
+	if (res < 0) {
+		printk(KERN_DEBUG "%s: decryption failed (SA=" MACSTR
+		       ") res=%d\n",
+		       local->dev->name, MAC2STR(hdr->addr2), res);
+		local->comm_tallies.rx_discards_wep_undecryptable++;
+		return -1;
+	}
+
+	return res;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static inline int
+hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb,
+			     int keyidx, struct prism2_crypt_data *crypt)
+{
+	struct hostap_ieee80211_hdr *hdr;
+	int res, hdrlen;
+
+	if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
+		return 0;
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+
+	atomic_inc(&crypt->refcnt);
+	res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
+	atomic_dec(&crypt->refcnt);
+	if (res < 0) {
+		printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
+		       " (SA=" MACSTR " keyidx=%d)\n",
+		       local->dev->name, MAC2STR(hdr->addr2), keyidx);
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/* All received frames are sent to this function. @skb contains the frame in
+ * IEEE 802.11 format, i.e., in the format it was sent over air.
+ * This function is called only as a tasklet (software IRQ). */
+void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
+		     struct hostap_80211_rx_status *rx_stats)
+{
+	struct hostap_interface *iface;
+	local_info_t *local;
+	struct hostap_ieee80211_hdr *hdr;
+	size_t hdrlen;
+	u16 fc, type, stype, sc;
+	struct net_device *wds = NULL;
+	struct net_device_stats *stats;
+	unsigned int frag;
+	u8 *payload;
+	struct sk_buff *skb2 = NULL;
+	u16 ethertype;
+	int frame_authorized = 0;
+	int from_assoc_ap = 0;
+	u8 dst[ETH_ALEN];
+	u8 src[ETH_ALEN];
+	struct prism2_crypt_data *crypt = NULL;
+	void *sta = NULL;
+	int keyidx = 0;
+
+	iface = netdev_priv(dev);
+	local = iface->local;
+	iface->stats.rx_packets++;
+	iface->stats.rx_bytes += skb->len;
+
+	/* dev is the master radio device; change this to be the default
+	 * virtual interface (this may be changed to WDS device below) */
+	dev = local->ddev;
+	iface = netdev_priv(dev);
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	stats = hostap_get_stats(dev);
+
+	if (skb->len < 10)
+		goto rx_dropped;
+
+	fc = le16_to_cpu(hdr->frame_control);
+	type = WLAN_FC_GET_TYPE(fc);
+	stype = WLAN_FC_GET_STYPE(fc);
+	sc = le16_to_cpu(hdr->seq_ctrl);
+	frag = WLAN_GET_SEQ_FRAG(sc);
+	hdrlen = hostap_80211_get_hdrlen(fc);
+
+	/* Put this code here so that we avoid duplicating it in all
+	 * Rx paths. - Jean II */
+#ifdef IW_WIRELESS_SPY		/* defined in iw_handler.h */
+	/* If spy monitoring on */
+	if (iface->spy_data.spy_number > 0) {
+		struct iw_quality wstats;
+		wstats.level = rx_stats->signal;
+		wstats.noise = rx_stats->noise;
+		wstats.updated = 6;	/* No qual value */
+		/* Update spy records */
+		wireless_spy_update(dev, hdr->addr2, &wstats);
+	}
+#endif /* IW_WIRELESS_SPY */
+	hostap_update_rx_stats(local->ap, hdr, rx_stats);
+
+	if (local->iw_mode == IW_MODE_MONITOR) {
+		monitor_rx(dev, skb, rx_stats);
+		return;
+	}
+
+	if (local->host_decrypt) {
+		int idx = 0;
+		if (skb->len >= hdrlen + 3)
+			idx = skb->data[hdrlen + 3] >> 6;
+		crypt = local->crypt[idx];
+		sta = NULL;
+
+		/* Use station specific key to override default keys if the
+		 * receiver address is a unicast address ("individual RA"). If
+		 * bcrx_sta_key parameter is set, station specific key is used
+		 * even with broad/multicast targets (this is against IEEE
+		 * 802.11, but makes it easier to use different keys with
+		 * stations that do not support WEP key mapping). */
+
+		if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
+			(void) hostap_handle_sta_crypto(local, hdr, &crypt,
+							&sta);
+
+		/* allow NULL decrypt to indicate an station specific override
+		 * for default encryption */
+		if (crypt && (crypt->ops == NULL ||
+			      crypt->ops->decrypt_mpdu == NULL))
+			crypt = NULL;
+
+		if (!crypt && (fc & WLAN_FC_ISWEP)) {
+#if 0
+			/* This seems to be triggered by some (multicast?)
+			 * frames from other than current BSS, so just drop the
+			 * frames silently instead of filling system log with
+			 * these reports. */
+			printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
+			       " (SA=" MACSTR ")\n",
+			       local->dev->name, MAC2STR(hdr->addr2));
+#endif
+			local->comm_tallies.rx_discards_wep_undecryptable++;
+			goto rx_dropped;
+		}
+	}
+
+	if (type != WLAN_FC_TYPE_DATA) {
+		if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
+		    fc & WLAN_FC_ISWEP && local->host_decrypt &&
+		    (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
+		{
+			printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
+			       "from " MACSTR "\n", dev->name,
+			       MAC2STR(hdr->addr2));
+			/* TODO: could inform hostapd about this so that it
+			 * could send auth failure report */
+			goto rx_dropped;
+		}
+
+		if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype))
+			goto rx_dropped;
+		else
+			goto rx_exit;
+	}
+
+	/* Data frame - extract src/dst addresses */
+	if (skb->len < IEEE80211_DATA_HDR3_LEN)
+		goto rx_dropped;
+
+	switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
+	case WLAN_FC_FROMDS:
+		memcpy(dst, hdr->addr1, ETH_ALEN);
+		memcpy(src, hdr->addr3, ETH_ALEN);
+		break;
+	case WLAN_FC_TODS:
+		memcpy(dst, hdr->addr3, ETH_ALEN);
+		memcpy(src, hdr->addr2, ETH_ALEN);
+		break;
+	case WLAN_FC_FROMDS | WLAN_FC_TODS:
+		if (skb->len < IEEE80211_DATA_HDR4_LEN)
+			goto rx_dropped;
+		memcpy(dst, hdr->addr3, ETH_ALEN);
+		memcpy(src, hdr->addr4, ETH_ALEN);
+		break;
+	case 0:
+		memcpy(dst, hdr->addr1, ETH_ALEN);
+		memcpy(src, hdr->addr2, ETH_ALEN);
+		break;
+	}
+
+	if (hostap_rx_frame_wds(local, hdr, fc, &wds))
+		goto rx_dropped;
+	if (wds) {
+		skb->dev = dev = wds;
+		stats = hostap_get_stats(dev);
+	}
+
+	if (local->iw_mode == IW_MODE_MASTER && !wds &&
+	    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == WLAN_FC_FROMDS &&
+	    local->stadev &&
+	    memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) {
+		/* Frame from BSSID of the AP for which we are a client */
+		skb->dev = dev = local->stadev;
+		stats = hostap_get_stats(dev);
+		from_assoc_ap = 1;
+	}
+
+	dev->last_rx = jiffies;
+
+	if ((local->iw_mode == IW_MODE_MASTER ||
+	     local->iw_mode == IW_MODE_REPEAT) &&
+	    !from_assoc_ap) {
+		switch (hostap_handle_sta_rx(local, dev, skb, rx_stats,
+					     wds != NULL)) {
+		case AP_RX_CONTINUE_NOT_AUTHORIZED:
+			frame_authorized = 0;
+			break;
+		case AP_RX_CONTINUE:
+			frame_authorized = 1;
+			break;
+		case AP_RX_DROP:
+			goto rx_dropped;
+		case AP_RX_EXIT:
+			goto rx_exit;
+		}
+	}
+
+	/* Nullfunc frames may have PS-bit set, so they must be passed to
+	 * hostap_handle_sta_rx() before being dropped here. */
+	if (stype != WLAN_FC_STYPE_DATA &&
+	    stype != WLAN_FC_STYPE_DATA_CFACK &&
+	    stype != WLAN_FC_STYPE_DATA_CFPOLL &&
+	    stype != WLAN_FC_STYPE_DATA_CFACKPOLL) {
+		if (stype != WLAN_FC_STYPE_NULLFUNC)
+			printk(KERN_DEBUG "%s: RX: dropped data frame "
+			       "with no data (type=0x%02x, subtype=0x%02x)\n",
+			       dev->name, type, stype);
+		goto rx_dropped;
+	}
+
+	/* skb: hdr + (possibly fragmented, possibly encrypted) payload */
+
+	if (local->host_decrypt && (fc & WLAN_FC_ISWEP) &&
+	    (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
+		goto rx_dropped;
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+
+	/* skb: hdr + (possibly fragmented) plaintext payload */
+
+	if (local->host_decrypt && (fc & WLAN_FC_ISWEP) &&
+	    (frag != 0 || (fc & WLAN_FC_MOREFRAG))) {
+		int flen;
+		struct sk_buff *frag_skb =
+			prism2_frag_cache_get(local, hdr);
+		if (!frag_skb) {
+			printk(KERN_DEBUG "%s: Rx cannot get skb from "
+			       "fragment cache (morefrag=%d seq=%u frag=%u)\n",
+			       dev->name, (fc & WLAN_FC_MOREFRAG) != 0,
+			       WLAN_GET_SEQ_SEQ(sc), frag);
+			goto rx_dropped;
+		}
+
+		flen = skb->len;
+		if (frag != 0)
+			flen -= hdrlen;
+
+		if (frag_skb->tail + flen > frag_skb->end) {
+			printk(KERN_WARNING "%s: host decrypted and "
+			       "reassembled frame did not fit skb\n",
+			       dev->name);
+			prism2_frag_cache_invalidate(local, hdr);
+			goto rx_dropped;
+		}
+
+		if (frag == 0) {
+			/* copy first fragment (including full headers) into
+			 * beginning of the fragment cache skb */
+			memcpy(skb_put(frag_skb, flen), skb->data, flen);
+		} else {
+			/* append frame payload to the end of the fragment
+			 * cache skb */
+			memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
+			       flen);
+		}
+		dev_kfree_skb(skb);
+		skb = NULL;
+
+		if (fc & WLAN_FC_MOREFRAG) {
+			/* more fragments expected - leave the skb in fragment
+			 * cache for now; it will be delivered to upper layers
+			 * after all fragments have been received */
+			goto rx_exit;
+		}
+
+		/* this was the last fragment and the frame will be
+		 * delivered, so remove skb from fragment cache */
+		skb = frag_skb;
+		hdr = (struct hostap_ieee80211_hdr *) skb->data;
+		prism2_frag_cache_invalidate(local, hdr);
+	}
+
+	/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
+	 * encrypted/authenticated */
+
+	if (local->host_decrypt && (fc & WLAN_FC_ISWEP) &&
+	    hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt))
+		goto rx_dropped;
+
+	hdr = (struct hostap_ieee80211_hdr *) skb->data;
+	if (crypt && !(fc & WLAN_FC_ISWEP) && !local->open_wep) {
+		if (local->ieee_802_1x &&
+		    hostap_is_eapol_frame(local, skb)) {
+			/* pass unencrypted EAPOL frames even if encryption is
+			 * configured */
+			PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing "
+			       "unencrypted EAPOL frame\n", local->dev->name);
+		} else {
+			printk(KERN_DEBUG "%s: encryption configured, but RX "
+			       "frame not encrypted (SA=" MACSTR ")\n",
+			       local->dev->name, MAC2STR(hdr->addr2));
+			goto rx_dropped;
+		}
+	}
+
+	if (local->drop_unencrypted && !(fc & WLAN_FC_ISWEP) &&
+	    !hostap_is_eapol_frame(local, skb)) {
+		if (net_ratelimit()) {
+			printk(KERN_DEBUG "%s: dropped unencrypted RX data "
+			       "frame from " MACSTR " (drop_unencrypted=1)\n",
+			       dev->name, MAC2STR(hdr->addr2));
+		}
+		goto rx_dropped;
+	}
+
+	/* skb: hdr + (possible reassembled) full plaintext payload */
+
+	payload = skb->data + hdrlen;
+	ethertype = (payload[6] << 8) | payload[7];
+
+	/* If IEEE 802.1X is used, check whether the port is authorized to send
+	 * the received frame. */
+	if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) {
+		if (ethertype == ETH_P_PAE) {
+			PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n",
+			       dev->name);
+			if (local->hostapd && local->apdev) {
+				/* Send IEEE 802.1X frames to the user
+				 * space daemon for processing */
+				prism2_rx_80211(local->apdev, skb, rx_stats,
+						PRISM2_RX_MGMT);
+				local->apdevstats.rx_packets++;
+				local->apdevstats.rx_bytes += skb->len;
+				goto rx_exit;
+			}
+		} else if (!frame_authorized) {
+			printk(KERN_DEBUG "%s: dropped frame from "
+			       "unauthorized port (IEEE 802.1X): "
+			       "ethertype=0x%04x\n",
+			       dev->name, ethertype);
+			goto rx_dropped;
+		}
+	}
+
+	/* convert hdr + possible LLC headers into Ethernet header */
+	if (skb->len - hdrlen >= 8 &&
+	    ((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 {
+		u16 len;
+		/* Leave Ethernet header part of hdr and full payload */
+		skb_pull(skb, hdrlen);
+		len = htons(skb->len);
+		memcpy(skb_push(skb, 2), &len, 2);
+		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
+		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
+	}
+
+	if (wds && ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == WLAN_FC_TODS) &&
+	    skb->len >= ETH_HLEN + ETH_ALEN) {
+		/* Non-standard frame: get addr4 from its bogus location after
+		 * the payload */
+		memcpy(skb->data + ETH_ALEN,
+		       skb->data + skb->len - ETH_ALEN, ETH_ALEN);
+		skb_trim(skb, skb->len - ETH_ALEN);
+	}
+
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+
+	if (local->iw_mode == IW_MODE_MASTER && !wds &&
+	    local->ap->bridge_packets) {
+		if (dst[0] & 0x01) {
+			/* copy multicast frame both to the higher layers and
+			 * to the wireless media */
+			local->ap->bridged_multicast++;
+			skb2 = skb_clone(skb, GFP_ATOMIC);
+			if (skb2 == NULL)
+				printk(KERN_DEBUG "%s: skb_clone failed for "
+				       "multicast frame\n", dev->name);
+		} else if (hostap_is_sta_authorized(local->ap, dst)) {
+			/* send frame directly to the associated STA using
+			 * wireless media and not passing to higher layers */
+			local->ap->bridged_unicast++;
+			skb2 = skb;
+			skb = NULL;
+		}
+	}
+
+	if (skb2 != NULL) {
+		/* send to wireless media */
+		skb2->protocol = __constant_htons(ETH_P_802_3);
+		skb2->mac.raw = skb2->nh.raw = skb2->data;
+		/* skb2->nh.raw = skb2->data + ETH_HLEN; */
+		skb2->dev = dev;
+		dev_queue_xmit(skb2);
+	}
+
+	if (skb) {
+		skb->protocol = eth_type_trans(skb, dev);
+		memset(skb->cb, 0, sizeof(skb->cb));
+		skb->dev = dev;
+		netif_rx(skb);
+	}
+
+ rx_exit:
+	if (sta)
+		hostap_handle_sta_release(sta);
+	return;
+
+ rx_dropped:
+	dev_kfree_skb(skb);
+
+	stats->rx_dropped++;
+	goto rx_exit;
+}
+
+
+EXPORT_SYMBOL(hostap_80211_rx);