[MAC80211]: split RX handlers into own file

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1360 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
new file mode 100644
index 000000000000..8c0d14c5628f
--- /dev/null
+++ b/net/mac80211/rx.c
@@ -0,0 +1,1360 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <net/iw_handler.h>
+#include <net/mac80211.h>
+#include <net/ieee80211_radiotap.h>
+
+#include "ieee80211_i.h"
+#include "ieee80211_led.h"
+#include "ieee80211_common.h"
+#include "wep.h"
+#include "wpa.h"
+#include "tkip.h"
+#include "wme.h"
+
+/* pre-rx handlers
+ *
+ * these don't have dev/sdata fields in the rx data
+ */
+
+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;
+        struct ieee80211_hw_mode *mode = local->hw.conf.mode;
+        int i;
+
+        /* Estimate total channel use caused by this frame */
+
+        if (unlikely(mode->num_rates < 0))
+                return TXRX_CONTINUE;
+
+        rate = &mode->rates[0];
+        for (i = 0; i < mode->num_rates; i++) {
+                if (mode->rates[i].val == rx->u.rx.status->rate) {
+                        rate = &mode->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 (mode->mode == MODE_IEEE80211A ||
+            mode->mode == MODE_ATHEROS_TURBO ||
+            mode->mode == MODE_ATHEROS_TURBOG ||
+            (mode->mode == MODE_IEEE80211G &&
+             rate->flags & IEEE80211_RATE_ERP))
+                hdrtime = CHAN_UTIL_HDR_SHORT;
+        else
+                hdrtime = CHAN_UTIL_HDR_LONG;
+
+        load = hdrtime;
+        if (!is_multicast_ether_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->u.rx.load = load;
+
+        return TXRX_CONTINUE;
+}
+
+ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
+{
+        ieee80211_rx_h_parse_qos,
+        ieee80211_rx_h_load_stats,
+        NULL
+};
+
+/* rx handlers */
+
+static ieee80211_txrx_result
+ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
+{
+        rx->sdata->channel_use_raw += rx->u.rx.load;
+        return TXRX_CONTINUE;
+}
+
+static void
+ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
+                     struct ieee80211_rx_status *status)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata;
+        struct ieee80211_rate *rate;
+        struct ieee80211_rtap_hdr {
+                struct ieee80211_radiotap_header hdr;
+                u8 flags;
+                u8 rate;
+                __le16 chan_freq;
+                __le16 chan_flags;
+                u8 antsignal;
+        } __attribute__ ((packed)) *rthdr;
+
+        skb->dev = dev;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        if (status->flag & RX_FLAG_RADIOTAP)
+                goto out;
+
+        if (skb_headroom(skb) < sizeof(*rthdr)) {
+                I802_DEBUG_INC(local->rx_expand_skb_head);
+                if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
+                        dev_kfree_skb(skb);
+                        return;
+                }
+        }
+
+        rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
+        memset(rthdr, 0, sizeof(*rthdr));
+        rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
+        rthdr->hdr.it_present =
+                cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
+                            (1 << IEEE80211_RADIOTAP_RATE) |
+                            (1 << IEEE80211_RADIOTAP_CHANNEL) |
+                            (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
+        rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
+                       IEEE80211_RADIOTAP_F_FCS : 0;
+        rate = ieee80211_get_rate(local, status->phymode, status->rate);
+        if (rate)
+                rthdr->rate = rate->rate / 5;
+        rthdr->chan_freq = cpu_to_le16(status->freq);
+        rthdr->chan_flags =
+                status->phymode == MODE_IEEE80211A ?
+                cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
+                cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
+        rthdr->antsignal = status->ssi;
+
+ out:
+        sdata->stats.rx_packets++;
+        sdata->stats.rx_bytes += skb->len;
+
+        skb_set_mac_header(skb, 0);
+        skb->ip_summed = CHECKSUM_UNNECESSARY;
+        skb->pkt_type = PACKET_OTHERHOST;
+        skb->protocol = htons(ETH_P_802_2);
+        memset(skb->cb, 0, sizeof(skb->cb));
+        netif_rx(skb);
+}
+
+static ieee80211_txrx_result
+ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
+{
+        if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
+                ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
+                return TXRX_QUEUED;
+        }
+
+        if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
+                skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
+
+        return TXRX_CONTINUE;
+}
+
+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 (unlikely(rx->u.rx.in_scan)) {
+                /* scanning finished during invoking of handlers */
+                I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
+                return TXRX_DROP;
+        }
+
+        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 && !is_multicast_ether_addr(hdr->addr1)) {
+                if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
+                             rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
+                             hdr->seq_ctrl)) {
+                        if (rx->u.rx.ra_match) {
+                                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.flags & IEEE80211_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;
+        }
+
+        if (!rx->u.rx.ra_match)
+                rx->skb->pkt_type = PACKET_OTHERHOST;
+        else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
+                rx->skb->pkt_type = PACKET_HOST;
+        else if (is_multicast_ether_addr(hdr->addr1)) {
+                if (is_broadcast_ether_addr(hdr->addr1))
+                        rx->skb->pkt_type = PACKET_BROADCAST;
+                else
+                        rx->skb->pkt_type = PACKET_MULTICAST;
+        } else
+                rx->skb->pkt_type = PACKET_OTHERHOST;
+
+        /* 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(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
+                      ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
+                       (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
+                     rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
+                     (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
+                if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
+                     !(rx->fc & IEEE80211_FCTL_TODS) &&
+                     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
+                    || !rx->u.rx.ra_match) {
+                        /* Drop IBSS frames and frames for other hosts
+                         * silently. */
+                        return TXRX_DROP;
+                }
+
+                if (!rx->local->apdev)
+                        return TXRX_DROP;
+
+                ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
+                                  ieee80211_msg_sta_not_assoc);
+                return TXRX_QUEUED;
+        }
+
+        if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
+                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->sta && rx->sta->key)
+                        rx->key = rx->sta->key;
+                else
+                        rx->key = rx->sdata->default_key;
+
+                if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
+                    rx->fc & IEEE80211_FCTL_PROTECTED) {
+                        int keyidx = ieee80211_wep_get_keyidx(rx->skb);
+
+                        if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
+                            (!rx->sta || !rx->sta->key || keyidx > 0))
+                                rx->key = rx->sdata->keys[keyidx];
+
+                        if (!rx->key) {
+                                if (!rx->u.rx.ra_match)
+                                        return TXRX_DROP;
+                                printk(KERN_DEBUG "%s: RX WEP frame with "
+                                       "unknown keyidx %d (A1=" MAC_FMT " A2="
+                                       MAC_FMT " A3=" MAC_FMT ")\n",
+                                       rx->dev->name, keyidx,
+                                       MAC_ARG(hdr->addr1),
+                                       MAC_ARG(hdr->addr2),
+                                       MAC_ARG(hdr->addr3));
+                                if (!rx->local->apdev)
+                                        return TXRX_DROP;
+                                ieee80211_rx_mgmt(
+                                        rx->local, rx->skb, rx->u.rx.status,
+                                        ieee80211_msg_wep_frame_unknown_key);
+                                return TXRX_QUEUED;
+                        }
+                }
+        }
+
+        if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
+                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 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 CONFIG_MAC80211_VERBOSE_PS_DEBUG
+        printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
+               "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+}
+
+static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct sk_buff *skb;
+        int sent = 0;
+        struct ieee80211_sub_if_data *sdata;
+        struct ieee80211_tx_packet_data *pkt_data;
+
+        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)) {
+                if (local->ops->set_tim)
+                        local->ops->set_tim(local_to_hw(local), sta->aid, 0);
+                if (sdata->bss)
+                        bss_tim_clear(local, sdata->bss, sta->aid);
+        }
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+        printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
+               "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+        /* 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->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 CONFIG_MAC80211_VERBOSE_PS_DEBUG
+                printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
+                       "since STA not sleeping anymore\n", dev->name,
+                       MAC_ARG(sta->addr), sta->aid);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+                pkt_data->requeue = 1;
+                dev_queue_xmit(skb);
+        }
+
+        return sent;
+}
+
+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->sdata->type == IEEE80211_IF_TYPE_IBSS) {
+                u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
+                if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
+                        sta->last_rx = jiffies;
+        } else
+        if (!is_multicast_ether_addr(hdr->addr1) ||
+            rx->sdata->type == IEEE80211_IF_TYPE_STA) {
+                /* 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;
+        }
+
+        if (!rx->u.rx.ra_match)
+                return TXRX_CONTINUE;
+
+        sta->rx_fragments++;
+        sta->rx_bytes += rx->skb->len;
+        sta->last_rssi = (sta->last_rssi * 15 +
+                          rx->u.rx.status->ssi) / 16;
+        sta->last_signal = (sta->last_signal * 15 +
+                            rx->u.rx.status->signal) / 16;
+        sta->last_noise = (sta->last_noise * 15 +
+                           rx->u.rx.status->noise) / 16;
+
+        if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
+                /* Change STA power saving mode only in the end of a frame
+                 * exchange sequence */
+                if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
+                        rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
+                else if (!(sta->flags & WLAN_STA_PS) &&
+                         (rx->fc & IEEE80211_FCTL_PM))
+                        ap_sta_ps_start(dev, sta);
+        }
+
+        /* Drop data::nullfunc frames silently, since they are used only to
+         * control station power saving mode. */
+        if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
+            (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
+                I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
+                /* Update counter and free packet here to avoid counting this
+                 * as a dropped packed. */
+                sta->rx_packets++;
+                dev_kfree_skb(rx->skb);
+                return TXRX_QUEUED;
+        }
+
+        return TXRX_CONTINUE;
+} /* ieee80211_rx_h_sta_process */
+
+static ieee80211_txrx_result
+ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
+{
+        if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
+            (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
+            !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
+                return TXRX_CONTINUE;
+
+        /* Check for weak IVs, if hwaccel did not remove IV from the frame */
+        if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
+            rx->key->force_sw_encrypt) {
+                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.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
+                return TXRX_CONTINUE;
+
+        if ((rx->key && rx->key->alg != ALG_WEP) ||
+            !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
+            ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
+             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
+              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_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) {
+                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.flags & IEEE80211_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 inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
+                         unsigned int frag, unsigned int seq, int rx_queue,
+                         struct sk_buff **skb)
+{
+        struct ieee80211_fragment_entry *entry;
+        int idx;
+
+        idx = sdata->fragment_next;
+        entry = &sdata->fragments[sdata->fragment_next++];
+        if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
+                sdata->fragment_next = 0;
+
+        if (!skb_queue_empty(&entry->skb_list)) {
+#ifdef CONFIG_MAC80211_DEBUG
+                struct ieee80211_hdr *hdr =
+                        (struct ieee80211_hdr *) entry->skb_list.next->data;
+                printk(KERN_DEBUG "%s: RX reassembly removed oldest "
+                       "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
+                       "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
+                       sdata->dev->name, idx,
+                       jiffies - entry->first_frag_time, entry->seq,
+                       entry->last_frag, MAC_ARG(hdr->addr1),
+                       MAC_ARG(hdr->addr2));
+#endif /* CONFIG_MAC80211_DEBUG */
+                __skb_queue_purge(&entry->skb_list);
+        }
+
+        __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
+        *skb = NULL;
+        entry->first_frag_time = jiffies;
+        entry->seq = seq;
+        entry->rx_queue = rx_queue;
+        entry->last_frag = frag;
+        entry->ccmp = 0;
+        entry->extra_len = 0;
+
+        return entry;
+}
+
+static inline struct ieee80211_fragment_entry *
+ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
+                          u16 fc, unsigned int frag, unsigned int seq,
+                          int rx_queue, struct ieee80211_hdr *hdr)
+{
+        struct ieee80211_fragment_entry *entry;
+        int i, idx;
+
+        idx = sdata->fragment_next;
+        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
+                struct ieee80211_hdr *f_hdr;
+                u16 f_fc;
+
+                idx--;
+                if (idx < 0)
+                        idx = IEEE80211_FRAGMENT_MAX - 1;
+
+                entry = &sdata->fragments[idx];
+                if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
+                    entry->rx_queue != rx_queue ||
+                    entry->last_frag + 1 != frag)
+                        continue;
+
+                f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
+                f_fc = le16_to_cpu(f_hdr->frame_control);
+
+                if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
+                    compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
+                    compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
+                        continue;
+
+                if (entry->first_frag_time + 2 * HZ < jiffies) {
+                        __skb_queue_purge(&entry->skb_list);
+                        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;
+        struct sk_buff *skb;
+
+        hdr = (struct ieee80211_hdr *) rx->skb->data;
+        sc = le16_to_cpu(hdr->seq_ctrl);
+        frag = sc & IEEE80211_SCTL_FRAG;
+
+        if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
+                   (rx->skb)->len < 24 ||
+                   is_multicast_ether_addr(hdr->addr1))) {
+                /* not fragmented */
+                goto out;
+        }
+        I802_DEBUG_INC(rx->local->rx_handlers_fragments);
+
+        seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
+
+        if (frag == 0) {
+                /* This is the first fragment of a new frame. */
+                entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
+                                                 rx->u.rx.queue, &(rx->skb));
+                if (rx->key && rx->key->alg == ALG_CCMP &&
+                    (rx->fc & IEEE80211_FCTL_PROTECTED)) {
+                        /* Store CCMP PN so that we can verify that the next
+                         * fragment has a sequential PN value. */
+                        entry->ccmp = 1;
+                        memcpy(entry->last_pn,
+                               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->sdata, 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 || 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=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
+                               "(expected %02x%02x%02x%02x%02x%02x)\n",
+                               rx->dev->name, MAC_ARG(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);
+        }
+
+        skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
+        __skb_queue_tail(&entry->skb_list, rx->skb);
+        entry->last_frag = frag;
+        entry->extra_len += rx->skb->len;
+        if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
+                rx->skb = NULL;
+                return TXRX_QUEUED;
+        }
+
+        rx->skb = __skb_dequeue(&entry->skb_list);
+        if (skb_tailroom(rx->skb) < entry->extra_len) {
+                I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
+                if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
+                                              GFP_ATOMIC))) {
+                        I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
+                        __skb_queue_purge(&entry->skb_list);
+                        return TXRX_DROP;
+                }
+        }
+        while ((skb = __skb_dequeue(&entry->skb_list))) {
+                memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
+                dev_kfree_skb(skb);
+        }
+
+        /* Complete frame has been reassembled - process it now */
+        rx->fragmented = 1;
+
+ out:
+        if (rx->sta)
+                rx->sta->rx_packets++;
+        if (is_multicast_ether_addr(hdr->addr1))
+                rx->local->dot11MulticastReceivedFrameCount++;
+        else
+                ieee80211_led_rx(rx->local);
+        return TXRX_CONTINUE;
+}
+
+static ieee80211_txrx_result
+ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
+{
+        struct sk_buff *skb;
+        int no_pending_pkts;
+
+        if (likely(!rx->sta ||
+                   (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
+                   (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
+                   !rx->u.rx.ra_match))
+                return TXRX_CONTINUE;
+
+        skb = skb_dequeue(&rx->sta->tx_filtered);
+        if (!skb) {
+                skb = skb_dequeue(&rx->sta->ps_tx_buf);
+                if (skb)
+                        rx->local->total_ps_buffered--;
+        }
+        no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
+                skb_queue_empty(&rx->sta->ps_tx_buf);
+
+        if (skb) {
+                struct ieee80211_hdr *hdr =
+                        (struct ieee80211_hdr *) skb->data;
+
+                /* 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 CONFIG_MAC80211_VERBOSE_PS_DEBUG
+                printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
+                       "after %d)\n",
+                       MAC_ARG(rx->sta->addr), rx->sta->aid,
+                       skb_queue_len(&rx->sta->ps_tx_buf));
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+
+                /* Use MoreData flag to indicate whether there are more
+                 * buffered frames for this STA */
+                if (no_pending_pkts) {
+                        hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
+                        rx->sta->flags &= ~WLAN_STA_TIM;
+                } else
+                        hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+
+                dev_queue_xmit(skb);
+
+                if (no_pending_pkts) {
+                        if (rx->local->ops->set_tim)
+                                rx->local->ops->set_tim(local_to_hw(rx->local),
+                                                       rx->sta->aid, 0);
+                        if (rx->sdata->bss)
+                                bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
+                }
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+        } else if (!rx->u.rx.sent_ps_buffered) {
+                printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
+                       "though there is no buffered frames for it\n",
+                       rx->dev->name, MAC_ARG(rx->sta->addr));
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+
+        }
+
+        /* 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 ieee80211_txrx_result
+ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
+{
+        if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
+            rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
+                /* Pass both encrypted and unencrypted EAPOL frames to user
+                 * space for processing. */
+                if (!rx->local->apdev)
+                        return TXRX_DROP;
+                ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
+                                  ieee80211_msg_normal);
+                return TXRX_QUEUED;
+        }
+
+        if (unlikely(rx->sdata->ieee802_1x &&
+                     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
+                     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
+                     (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
+                     !ieee80211_is_eapol(rx->skb))) {
+#ifdef CONFIG_MAC80211_DEBUG
+                struct ieee80211_hdr *hdr =
+                        (struct ieee80211_hdr *) rx->skb->data;
+                printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
+                       " (unauthorized port)\n", rx->dev->name,
+                       MAC_ARG(hdr->addr2));
+#endif /* CONFIG_MAC80211_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.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
+                return TXRX_CONTINUE;
+
+        /* Drop unencrypted frames if key is set. */
+        if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
+                     (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
+                     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
+                     (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_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 = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        fc = rx->fc;
+        if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_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 & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
+        case IEEE80211_FCTL_TODS:
+                /* BSSID SA DA */
+                memcpy(dst, hdr->addr3, ETH_ALEN);
+                memcpy(src, hdr->addr2, ETH_ALEN);
+
+                if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
+                             sdata->type != IEEE80211_IF_TYPE_VLAN)) {
+                        printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
+                               MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
+                               dev->name, MAC_ARG(hdr->addr1),
+                               MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
+                        return TXRX_DROP;
+                }
+                break;
+        case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
+                /* RA TA DA SA */
+                memcpy(dst, hdr->addr3, ETH_ALEN);
+                memcpy(src, hdr->addr4, ETH_ALEN);
+
+                if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
+                        printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
+                               MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
+                               MAC_FMT ")\n",
+                               rx->dev->name, MAC_ARG(hdr->addr1),
+                               MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
+                               MAC_ARG(hdr->addr4));
+                        return TXRX_DROP;
+                }
+                break;
+        case IEEE80211_FCTL_FROMDS:
+                /* DA BSSID SA */
+                memcpy(dst, hdr->addr1, ETH_ALEN);
+                memcpy(src, hdr->addr3, ETH_ALEN);
+
+                if (sdata->type != IEEE80211_IF_TYPE_STA) {
+                        return TXRX_DROP;
+                }
+                break;
+        case 0:
+                /* DA SA BSSID */
+                memcpy(dst, hdr->addr1, ETH_ALEN);
+                memcpy(src, hdr->addr2, ETH_ALEN);
+
+                if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
+                        if (net_ratelimit()) {
+                                printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
+                                       MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
+                                       ")\n",
+                                       dev->name, MAC_ARG(hdr->addr1),
+                                       MAC_ARG(hdr->addr2),
+                                       MAC_ARG(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((compare_ether_addr(payload, rfc1042_header) == 0 &&
+                    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
+                   compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
+                /* remove RFC1042 or Bridge-Tunnel encapsulation and
+                 * replace EtherType */
+                skb_pull(skb, hdrlen + 6);
+                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
+                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
+        } else {
+                struct ethhdr *ehdr;
+                __be16 len;
+                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;
+        }
+        skb->dev = dev;
+
+        skb2 = NULL;
+
+        sdata->stats.rx_packets++;
+        sdata->stats.rx_bytes += skb->len;
+
+        if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
+            || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
+                if (is_multicast_ether_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)
+                                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) {
+                                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_put(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);
+                skb_set_network_header(skb2, 0);
+                skb_set_mac_header(skb2, 0);
+                dev_queue_xmit(skb2);
+        }
+
+        return TXRX_QUEUED;
+}
+
+static ieee80211_txrx_result
+ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
+{
+        struct ieee80211_sub_if_data *sdata;
+
+        if (!rx->u.rx.ra_match)
+                return TXRX_DROP;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
+        if ((sdata->type == IEEE80211_IF_TYPE_STA ||
+             sdata->type == IEEE80211_IF_TYPE_IBSS) &&
+            !rx->local->user_space_mlme) {
+                ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
+        } else {
+                /* Management frames are sent to hostapd for processing */
+                if (!rx->local->apdev)
+                        return TXRX_DROP;
+                ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
+                                  ieee80211_msg_normal);
+        }
+        return TXRX_QUEUED;
+}
+
+static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
+                                struct ieee80211_local *local,
+                                ieee80211_rx_handler *handlers,
+                                struct ieee80211_txrx_data *rx,
+                                struct sta_info *sta)
+{
+        ieee80211_rx_handler *handler;
+        ieee80211_txrx_result res = TXRX_DROP;
+
+        for (handler = 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) {
+                dev_kfree_skb(rx->skb);
+        }
+        return res;
+}
+
+static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
+                                                ieee80211_rx_handler *handlers,
+                                                struct ieee80211_txrx_data *rx,
+                                                struct sta_info *sta)
+{
+        if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
+            TXRX_CONTINUE)
+                dev_kfree_skb(rx->skb);
+}
+
+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 " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
+               dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
+
+        if (!sta) {
+                /* 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 " MAC_FMT "\n",
+                       dev->name, MAC_ARG(hdr->addr2));
+                goto ignore;
+        }
+
+        if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
+                printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
+                       "error for a frame with no ISWEP flag (src "
+                       MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
+                goto ignore;
+        }
+
+        if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
+            rx->sdata->type == IEEE80211_IF_TYPE_AP) {
+                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 " MAC_FMT
+                               ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
+                        goto ignore;
+                }
+        }
+
+        if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
+            ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
+             (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
+                printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
+                       "error for a frame that cannot be encrypted "
+                       "(fc=0x%04x) (src " MAC_FMT ")\n",
+                       dev->name, rx->fc, MAC_ARG(hdr->addr2));
+                goto ignore;
+        }
+
+        do {
+                union iwreq_data wrqu;
+                char *buf = kmalloc(128, GFP_ATOMIC);
+                if (!buf)
+                        break;
+
+                /* TODO: needed parameters: count, key type, TSC */
+                sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
+                        "keyid=%d %scast addr=" MAC_FMT ")",
+                        keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
+                        MAC_ARG(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. */
+        if (!rx->local->apdev)
+                goto ignore;
+        ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
+                          ieee80211_msg_michael_mic_failure);
+        return;
+
+ ignore:
+        dev_kfree_skb(rx->skb);
+        rx->skb = NULL;
+}
+
+ieee80211_rx_handler ieee80211_rx_handlers[] =
+{
+        ieee80211_rx_h_if_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_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
+};
+
+/* main receive path */
+
+/*
+ * This is the receive path handler. It is called by a low level driver when an
+ * 802.11 MPDU is received from the hardware.
+ */
+void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
+                    struct ieee80211_rx_status *status)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+        struct ieee80211_sub_if_data *sdata;
+        struct sta_info *sta;
+        struct ieee80211_hdr *hdr;
+        struct ieee80211_txrx_data rx;
+        u16 type;
+        int multicast;
+        int radiotap_len = 0;
+
+        if (status->flag & RX_FLAG_RADIOTAP) {
+                radiotap_len = ieee80211_get_radiotap_len(skb->data);
+                skb_pull(skb, radiotap_len);
+        }
+
+        hdr = (struct ieee80211_hdr *) skb->data;
+        memset(&rx, 0, sizeof(rx));
+        rx.skb = skb;
+        rx.local = local;
+
+        rx.u.rx.status = status;
+        rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
+        type = rx.fc & IEEE80211_FCTL_FTYPE;
+        if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
+                local->dot11ReceivedFragmentCount++;
+        multicast = is_multicast_ether_addr(hdr->addr1);
+
+        if (skb->len >= 16)
+                sta = rx.sta = sta_info_get(local, hdr->addr2);
+        else
+                sta = rx.sta = NULL;
+
+        if (sta) {
+                rx.dev = sta->dev;
+                rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
+        }
+
+        if ((status->flag & RX_FLAG_MMIC_ERROR)) {
+                ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
+                goto end;
+        }
+
+        if (unlikely(local->sta_scanning))
+                rx.u.rx.in_scan = 1;
+
+        if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
+                                           sta) != TXRX_CONTINUE)
+                goto end;
+        skb = rx.skb;
+
+        skb_push(skb, radiotap_len);
+        if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
+            !local->iff_promiscs && !multicast) {
+                rx.u.rx.ra_match = 1;
+                ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
+                                             sta);
+        } else {
+                struct ieee80211_sub_if_data *prev = NULL;
+                struct sk_buff *skb_new;
+                u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
+
+                read_lock(&local->sub_if_lock);
+                list_for_each_entry(sdata, &local->sub_if_list, list) {
+                        rx.u.rx.ra_match = 1;
+                        switch (sdata->type) {
+                        case IEEE80211_IF_TYPE_STA:
+                                if (!bssid)
+                                        continue;
+                                if (!ieee80211_bssid_match(bssid,
+                                                        sdata->u.sta.bssid)) {
+                                        if (!rx.u.rx.in_scan)
+                                                continue;
+                                        rx.u.rx.ra_match = 0;
+                                } else if (!multicast &&
+                                           compare_ether_addr(sdata->dev->dev_addr,
+                                                              hdr->addr1) != 0) {
+                                        if (!sdata->promisc)
+                                                continue;
+                                        rx.u.rx.ra_match = 0;
+                                }
+                                break;
+                        case IEEE80211_IF_TYPE_IBSS:
+                                if (!bssid)
+                                        continue;
+                                if (!ieee80211_bssid_match(bssid,
+                                                        sdata->u.sta.bssid)) {
+                                        if (!rx.u.rx.in_scan)
+                                                continue;
+                                        rx.u.rx.ra_match = 0;
+                                } else if (!multicast &&
+                                           compare_ether_addr(sdata->dev->dev_addr,
+                                                              hdr->addr1) != 0) {
+                                        if (!sdata->promisc)
+                                                continue;
+                                        rx.u.rx.ra_match = 0;
+                                } else if (!sta)
+                                        sta = rx.sta =
+                                                ieee80211_ibss_add_sta(sdata->dev,
+                                                                       skb, bssid,
+                                                                       hdr->addr2);
+                                break;
+                        case IEEE80211_IF_TYPE_AP:
+                                if (!bssid) {
+                                        if (compare_ether_addr(sdata->dev->dev_addr,
+                                                               hdr->addr1) != 0)
+                                                continue;
+                                } else if (!ieee80211_bssid_match(bssid,
+                                                        sdata->dev->dev_addr)) {
+                                        if (!rx.u.rx.in_scan)
+                                                continue;
+                                        rx.u.rx.ra_match = 0;
+                                }
+                                if (sdata->dev == local->mdev &&
+                                    !rx.u.rx.in_scan)
+                                        /* do not receive anything via
+                                         * master device when not scanning */
+                                        continue;
+                                break;
+                        case IEEE80211_IF_TYPE_WDS:
+                                if (bssid ||
+                                    (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
+                                        continue;
+                                if (compare_ether_addr(sdata->u.wds.remote_addr,
+                                                       hdr->addr2) != 0)
+                                        continue;
+                                break;
+                        }
+
+                        if (prev) {
+                                skb_new = skb_copy(skb, GFP_ATOMIC);
+                                if (!skb_new) {
+                                        if (net_ratelimit())
+                                                printk(KERN_DEBUG "%s: failed to copy "
+                                                       "multicast frame for %s",
+                                                       local->mdev->name, prev->dev->name);
+                                        continue;
+                                }
+                                rx.skb = skb_new;
+                                rx.dev = prev->dev;
+                                rx.sdata = prev;
+                                ieee80211_invoke_rx_handlers(local,
+                                                             local->rx_handlers,
+                                                             &rx, sta);
+                        }
+                        prev = sdata;
+                }
+                if (prev) {
+                        rx.skb = skb;
+                        rx.dev = prev->dev;
+                        rx.sdata = prev;
+                        ieee80211_invoke_rx_handlers(local, local->rx_handlers,
+                                                     &rx, sta);
+                } else
+                        dev_kfree_skb(skb);
+                read_unlock(&local->sub_if_lock);
+        }
+
+  end:
+        if (sta)
+                sta_info_put(sta);
+}
+EXPORT_SYMBOL(__ieee80211_rx);
+
+/* This is a version of the rx handler that can be called from hard irq
+ * context. Post the skb on the queue and schedule the tasklet */
+void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
+                          struct ieee80211_rx_status *status)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+
+        BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
+
+        skb->dev = local->mdev;
+        /* copy status into skb->cb for use by tasklet */
+        memcpy(skb->cb, status, sizeof(*status));
+        skb->pkt_type = IEEE80211_RX_MSG;
+        skb_queue_tail(&local->skb_queue, skb);
+        tasklet_schedule(&local->tasklet);
+}
+EXPORT_SYMBOL(ieee80211_rx_irqsafe);