SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/etherdevice.h>
  16 #include <net/iw_handler.h>
  17 #include <net/mac80211.h>
  18 #include <net/ieee80211_radiotap.h>
  19
  20 #include "ieee80211_i.h"
  21 #include "ieee80211_led.h"
  22 #include "ieee80211_common.h"
  23 #include "wep.h"
  24 #include "wpa.h"
  25 #include "tkip.h"
  26 #include "wme.h"
  27
  28 /* pre-rx handlers
  29  *
  30  * these don't have dev/sdata fields in the rx data
  31  */
  32
  33 static ieee80211_txrx_result
  34 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
  35 {
  36         u8 *data = rx->skb->data;
  37         int tid;
  38
  39         /* does the frame have a qos control field? */
  40         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
  41                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
  42                 /* frame has qos control */
  43                 tid = qc[0] & QOS_CONTROL_TID_MASK;
  44         } else {
  45                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
  46                         /* Separate TID for management frames */
  47                         tid = NUM_RX_DATA_QUEUES - 1;
  48                 } else {
  49                         /* no qos control present */
  50                         tid = 0; /* 802.1d - Best Effort */
  51                 }
  52         }
  53 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
  54         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
  55         if (rx->sta) {
  56                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
  57         }
  58 #endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
  59
  60         rx->u.rx.queue = tid;
  61         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
  62          * For now, set skb->priority to 0 for other cases. */
  63         rx->skb->priority = (tid > 7) ? 0 : tid;
  64
  65         return TXRX_CONTINUE;
  66 }
  67
  68 static ieee80211_txrx_result
  69 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
  70 {
  71         struct ieee80211_local *local = rx->local;
  72         struct sk_buff *skb = rx->skb;
  73         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  74         u32 load = 0, hdrtime;
  75         struct ieee80211_rate *rate;
  76         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
  77         int i;
  78
  79         /* Estimate total channel use caused by this frame */
  80
  81         if (unlikely(mode->num_rates < 0))
  82                 return TXRX_CONTINUE;
  83
  84         rate = &mode->rates[0];
  85         for (i = 0; i < mode->num_rates; i++) {
  86                 if (mode->rates[i].val == rx->u.rx.status->rate) {
  87                         rate = &mode->rates[i];
  88                         break;
  89                 }
  90         }
  91
  92         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
  93          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
  94
  95         if (mode->mode == MODE_IEEE80211A ||
  96             mode->mode == MODE_ATHEROS_TURBO ||
  97             mode->mode == MODE_ATHEROS_TURBOG ||
  98             (mode->mode == MODE_IEEE80211G &&
  99              rate->flags & IEEE80211_RATE_ERP))
 100                 hdrtime = CHAN_UTIL_HDR_SHORT;
 101         else
 102                 hdrtime = CHAN_UTIL_HDR_LONG;
 103
 104         load = hdrtime;
 105         if (!is_multicast_ether_addr(hdr->addr1))
 106                 load += hdrtime;
 107
 108         load += skb->len * rate->rate_inv;
 109
 110         /* Divide channel_use by 8 to avoid wrapping around the counter */
 111         load >>= CHAN_UTIL_SHIFT;
 112         local->channel_use_raw += load;
 113         if (rx->sta)
 114                 rx->sta->channel_use_raw += load;
 115         rx->u.rx.load = load;
 116
 117         return TXRX_CONTINUE;
 118 }
 119
 120 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 121 {
 122         ieee80211_rx_h_parse_qos,
 123         ieee80211_rx_h_load_stats,
 124         NULL
 125 };
 126
 127 /* rx handlers */
 128
 129 static ieee80211_txrx_result
 130 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
 131 {
 132         rx->sdata->channel_use_raw += rx->u.rx.load;
 133         return TXRX_CONTINUE;
 134 }
 135
 136 static void
 137 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
 138                      struct ieee80211_rx_status *status)
 139 {
 140         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 141         struct ieee80211_sub_if_data *sdata;
 142         struct ieee80211_rate *rate;
 143         struct ieee80211_rtap_hdr {
 144                 struct ieee80211_radiotap_header hdr;
 145                 u8 flags;
 146                 u8 rate;
 147                 __le16 chan_freq;
 148                 __le16 chan_flags;
 149                 u8 antsignal;
 150         } __attribute__ ((packed)) *rthdr;
 151
 152         skb->dev = dev;
 153
 154         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 155
 156         if (status->flag & RX_FLAG_RADIOTAP)
 157                 goto out;
 158
 159         if (skb_headroom(skb) < sizeof(*rthdr)) {
 160                 I802_DEBUG_INC(local->rx_expand_skb_head);
 161                 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
 162                         dev_kfree_skb(skb);
 163                         return;
 164                 }
 165         }
 166
 167         rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
 168         memset(rthdr, 0, sizeof(*rthdr));
 169         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 170         rthdr->hdr.it_present =
 171                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 172                             (1 << IEEE80211_RADIOTAP_RATE) |
 173                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 174                             (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
 175         rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
 176                        IEEE80211_RADIOTAP_F_FCS : 0;
 177         rate = ieee80211_get_rate(local, status->phymode, status->rate);
 178         if (rate)
 179                 rthdr->rate = rate->rate / 5;
 180         rthdr->chan_freq = cpu_to_le16(status->freq);
 181         rthdr->chan_flags =
 182                 status->phymode == MODE_IEEE80211A ?
 183                 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
 184                 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
 185         rthdr->antsignal = status->ssi;
 186
 187  out:
 188         sdata->stats.rx_packets++;
 189         sdata->stats.rx_bytes += skb->len;
 190
 191         skb_set_mac_header(skb, 0);
 192         skb->ip_summed = CHECKSUM_UNNECESSARY;
 193         skb->pkt_type = PACKET_OTHERHOST;
 194         skb->protocol = htons(ETH_P_802_2);
 195         memset(skb->cb, 0, sizeof(skb->cb));
 196         netif_rx(skb);
 197 }
 198
 199 static ieee80211_txrx_result
 200 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
 201 {
 202         if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
 203                 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
 204                 return TXRX_QUEUED;
 205         }
 206
 207         if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
 208                 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
 209
 210         return TXRX_CONTINUE;
 211 }
 212
 213 static ieee80211_txrx_result
 214 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
 215 {
 216         struct ieee80211_local *local = rx->local;
 217         struct sk_buff *skb = rx->skb;
 218
 219         if (unlikely(local->sta_scanning != 0)) {
 220                 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
 221                 return TXRX_QUEUED;
 222         }
 223
 224         if (unlikely(rx->u.rx.in_scan)) {
 225                 /* scanning finished during invoking of handlers */
 226                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 227                 return TXRX_DROP;
 228         }
 229
 230         return TXRX_CONTINUE;
 231 }
 232
 233 static ieee80211_txrx_result
 234 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 235 {
 236         struct ieee80211_hdr *hdr;
 237         hdr = (struct ieee80211_hdr *) rx->skb->data;
 238
 239         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 240         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 241                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
 242                              rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
 243                              hdr->seq_ctrl)) {
 244                         if (rx->u.rx.ra_match) {
 245                                 rx->local->dot11FrameDuplicateCount++;
 246                                 rx->sta->num_duplicates++;
 247                         }
 248                         return TXRX_DROP;
 249                 } else
 250                         rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
 251         }
 252
 253         if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
 254             rx->skb->len > FCS_LEN)
 255                 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
 256
 257         if (unlikely(rx->skb->len < 16)) {
 258                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 259                 return TXRX_DROP;
 260         }
 261
 262         if (!rx->u.rx.ra_match)
 263                 rx->skb->pkt_type = PACKET_OTHERHOST;
 264         else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
 265                 rx->skb->pkt_type = PACKET_HOST;
 266         else if (is_multicast_ether_addr(hdr->addr1)) {
 267                 if (is_broadcast_ether_addr(hdr->addr1))
 268                         rx->skb->pkt_type = PACKET_BROADCAST;
 269                 else
 270                         rx->skb->pkt_type = PACKET_MULTICAST;
 271         } else
 272                 rx->skb->pkt_type = PACKET_OTHERHOST;
 273
 274         /* Drop disallowed frame classes based on STA auth/assoc state;
 275          * IEEE 802.11, Chap 5.5.
 276          *
 277          * 80211.o does filtering only based on association state, i.e., it
 278          * drops Class 3 frames from not associated stations. hostapd sends
 279          * deauth/disassoc frames when needed. In addition, hostapd is
 280          * responsible for filtering on both auth and assoc states.
 281          */
 282         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
 283                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
 284                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
 285                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 286                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
 287                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
 288                      !(rx->fc & IEEE80211_FCTL_TODS) &&
 289                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
 290                     || !rx->u.rx.ra_match) {
 291                         /* Drop IBSS frames and frames for other hosts
 292                          * silently. */
 293                         return TXRX_DROP;
 294                 }
 295
 296                 if (!rx->local->apdev)
 297                         return TXRX_DROP;
 298
 299                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
 300                                   ieee80211_msg_sta_not_assoc);
 301                 return TXRX_QUEUED;
 302         }
 303
 304         return TXRX_CONTINUE;
 305 }
 306
 307
 308 static ieee80211_txrx_result
 309 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
 310 {
 311         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 312         int always_sta_key;
 313
 314         if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
 315                 always_sta_key = 0;
 316         else
 317                 always_sta_key = 1;
 318
 319         if (rx->sta && rx->sta->key && always_sta_key) {
 320                 rx->key = rx->sta->key;
 321         } else {
 322                 if (rx->sta && rx->sta->key)
 323                         rx->key = rx->sta->key;
 324                 else
 325                         rx->key = rx->sdata->default_key;
 326
 327                 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
 328                     rx->fc & IEEE80211_FCTL_PROTECTED) {
 329                         int keyidx = ieee80211_wep_get_keyidx(rx->skb);
 330
 331                         if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
 332                             (!rx->sta || !rx->sta->key || keyidx > 0))
 333                                 rx->key = rx->sdata->keys[keyidx];
 334
 335                         if (!rx->key) {
 336                                 if (!rx->u.rx.ra_match)
 337                                         return TXRX_DROP;
 338                                 printk(KERN_DEBUG "%s: RX WEP frame with "
 339                                        "unknown keyidx %d (A1=" MAC_FMT " A2="
 340                                        MAC_FMT " A3=" MAC_FMT ")\n",
 341                                        rx->dev->name, keyidx,
 342                                        MAC_ARG(hdr->addr1),
 343                                        MAC_ARG(hdr->addr2),
 344                                        MAC_ARG(hdr->addr3));
 345                                 if (!rx->local->apdev)
 346                                         return TXRX_DROP;
 347                                 ieee80211_rx_mgmt(
 348                                         rx->local, rx->skb, rx->u.rx.status,
 349                                         ieee80211_msg_wep_frame_unknown_key);
 350                                 return TXRX_QUEUED;
 351                         }
 352                 }
 353         }
 354
 355         if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
 356                 rx->key->tx_rx_count++;
 357                 if (unlikely(rx->local->key_tx_rx_threshold &&
 358                              rx->key->tx_rx_count >
 359                              rx->local->key_tx_rx_threshold)) {
 360                         ieee80211_key_threshold_notify(rx->dev, rx->key,
 361                                                        rx->sta);
 362                 }
 363         }
 364
 365         return TXRX_CONTINUE;
 366 }
 367
 368 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 369 {
 370         struct ieee80211_sub_if_data *sdata;
 371         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 372
 373         if (sdata->bss)
 374                 atomic_inc(&sdata->bss->num_sta_ps);
 375         sta->flags |= WLAN_STA_PS;
 376         sta->pspoll = 0;
 377 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 378         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
 379                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 380 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 381 }
 382
 383 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 384 {
 385         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 386         struct sk_buff *skb;
 387         int sent = 0;
 388         struct ieee80211_sub_if_data *sdata;
 389         struct ieee80211_tx_packet_data *pkt_data;
 390
 391         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 392         if (sdata->bss)
 393                 atomic_dec(&sdata->bss->num_sta_ps);
 394         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
 395         sta->pspoll = 0;
 396         if (!skb_queue_empty(&sta->ps_tx_buf)) {
 397                 if (local->ops->set_tim)
 398                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
 399                 if (sdata->bss)
 400                         bss_tim_clear(local, sdata->bss, sta->aid);
 401         }
 402 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 403         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
 404                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 405 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 406         /* Send all buffered frames to the station */
 407         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 408                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 409                 sent++;
 410                 pkt_data->requeue = 1;
 411                 dev_queue_xmit(skb);
 412         }
 413         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 414                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 415                 local->total_ps_buffered--;
 416                 sent++;
 417 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 418                 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
 419                        "since STA not sleeping anymore\n", dev->name,
 420                        MAC_ARG(sta->addr), sta->aid);
 421 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 422                 pkt_data->requeue = 1;
 423                 dev_queue_xmit(skb);
 424         }
 425
 426         return sent;
 427 }
 428
 429 static ieee80211_txrx_result
 430 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 431 {
 432         struct sta_info *sta = rx->sta;
 433         struct net_device *dev = rx->dev;
 434         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 435
 436         if (!sta)
 437                 return TXRX_CONTINUE;
 438
 439         /* Update last_rx only for IBSS packets which are for the current
 440          * BSSID to avoid keeping the current IBSS network alive in cases where
 441          * other STAs are using different BSSID. */
 442         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
 443                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
 444                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 445                         sta->last_rx = jiffies;
 446         } else
 447         if (!is_multicast_ether_addr(hdr->addr1) ||
 448             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
 449                 /* Update last_rx only for unicast frames in order to prevent
 450                  * the Probe Request frames (the only broadcast frames from a
 451                  * STA in infrastructure mode) from keeping a connection alive.
 452                  */
 453                 sta->last_rx = jiffies;
 454         }
 455
 456         if (!rx->u.rx.ra_match)
 457                 return TXRX_CONTINUE;
 458
 459         sta->rx_fragments++;
 460         sta->rx_bytes += rx->skb->len;
 461         sta->last_rssi = (sta->last_rssi * 15 +
 462                           rx->u.rx.status->ssi) / 16;
 463         sta->last_signal = (sta->last_signal * 15 +
 464                             rx->u.rx.status->signal) / 16;
 465         sta->last_noise = (sta->last_noise * 15 +
 466                            rx->u.rx.status->noise) / 16;
 467
 468         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
 469                 /* Change STA power saving mode only in the end of a frame
 470                  * exchange sequence */
 471                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
 472                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
 473                 else if (!(sta->flags & WLAN_STA_PS) &&
 474                          (rx->fc & IEEE80211_FCTL_PM))
 475                         ap_sta_ps_start(dev, sta);
 476         }
 477
 478         /* Drop data::nullfunc frames silently, since they are used only to
 479          * control station power saving mode. */
 480         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 481             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
 482                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 483                 /* Update counter and free packet here to avoid counting this
 484                  * as a dropped packed. */
 485                 sta->rx_packets++;
 486                 dev_kfree_skb(rx->skb);
 487                 return TXRX_QUEUED;
 488         }
 489
 490         return TXRX_CONTINUE;
 491 } /* ieee80211_rx_h_sta_process */
 492
 493 static ieee80211_txrx_result
 494 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
 495 {
 496         if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 497             (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
 498             !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
 499                 return TXRX_CONTINUE;
 500
 501         /* Check for weak IVs, if hwaccel did not remove IV from the frame */
 502         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
 503             rx->key->force_sw_encrypt) {
 504                 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
 505                 if (iv) {
 506                         rx->sta->wep_weak_iv_count++;
 507                 }
 508         }
 509
 510         return TXRX_CONTINUE;
 511 }
 512
 513 static ieee80211_txrx_result
 514 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
 515 {
 516         /* If the device handles decryption totally, skip this test */
 517         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
 518                 return TXRX_CONTINUE;
 519
 520         if ((rx->key && rx->key->alg != ALG_WEP) ||
 521             !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 522             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
 523              ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 524               (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
 525                 return TXRX_CONTINUE;
 526
 527         if (!rx->key) {
 528                 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
 529                        rx->dev->name);
 530                 return TXRX_DROP;
 531         }
 532
 533         if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
 534             rx->key->force_sw_encrypt) {
 535                 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
 536                         printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
 537                                "failed\n", rx->dev->name);
 538                         return TXRX_DROP;
 539                 }
 540         } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
 541                 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
 542                 /* remove ICV */
 543                 skb_trim(rx->skb, rx->skb->len - 4);
 544         }
 545
 546         return TXRX_CONTINUE;
 547 }
 548
 549 static inline struct ieee80211_fragment_entry *
 550 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 551                          unsigned int frag, unsigned int seq, int rx_queue,
 552                          struct sk_buff **skb)
 553 {
 554         struct ieee80211_fragment_entry *entry;
 555         int idx;
 556
 557         idx = sdata->fragment_next;
 558         entry = &sdata->fragments[sdata->fragment_next++];
 559         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 560                 sdata->fragment_next = 0;
 561
 562         if (!skb_queue_empty(&entry->skb_list)) {
 563 #ifdef CONFIG_MAC80211_DEBUG
 564                 struct ieee80211_hdr *hdr =
 565                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 566                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 567                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 568                        "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
 569                        sdata->dev->name, idx,
 570                        jiffies - entry->first_frag_time, entry->seq,
 571                        entry->last_frag, MAC_ARG(hdr->addr1),
 572                        MAC_ARG(hdr->addr2));
 573 #endif /* CONFIG_MAC80211_DEBUG */
 574                 __skb_queue_purge(&entry->skb_list);
 575         }
 576
 577         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 578         *skb = NULL;
 579         entry->first_frag_time = jiffies;
 580         entry->seq = seq;
 581         entry->rx_queue = rx_queue;
 582         entry->last_frag = frag;
 583         entry->ccmp = 0;
 584         entry->extra_len = 0;
 585
 586         return entry;
 587 }
 588
 589 static inline struct ieee80211_fragment_entry *
 590 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 591                           u16 fc, unsigned int frag, unsigned int seq,
 592                           int rx_queue, struct ieee80211_hdr *hdr)
 593 {
 594         struct ieee80211_fragment_entry *entry;
 595         int i, idx;
 596
 597         idx = sdata->fragment_next;
 598         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 599                 struct ieee80211_hdr *f_hdr;
 600                 u16 f_fc;
 601
 602                 idx--;
 603                 if (idx < 0)
 604                         idx = IEEE80211_FRAGMENT_MAX - 1;
 605
 606                 entry = &sdata->fragments[idx];
 607                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 608                     entry->rx_queue != rx_queue ||
 609                     entry->last_frag + 1 != frag)
 610                         continue;
 611
 612                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 613                 f_fc = le16_to_cpu(f_hdr->frame_control);
 614
 615                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 616                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 617                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 618                         continue;
 619
 620                 if (entry->first_frag_time + 2 * HZ < jiffies) {
 621                         __skb_queue_purge(&entry->skb_list);
 622                         continue;
 623                 }
 624                 return entry;
 625         }
 626
 627         return NULL;
 628 }
 629
 630 static ieee80211_txrx_result
 631 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 632 {
 633         struct ieee80211_hdr *hdr;
 634         u16 sc;
 635         unsigned int frag, seq;
 636         struct ieee80211_fragment_entry *entry;
 637         struct sk_buff *skb;
 638
 639         hdr = (struct ieee80211_hdr *) rx->skb->data;
 640         sc = le16_to_cpu(hdr->seq_ctrl);
 641         frag = sc & IEEE80211_SCTL_FRAG;
 642
 643         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 644                    (rx->skb)->len < 24 ||
 645                    is_multicast_ether_addr(hdr->addr1))) {
 646                 /* not fragmented */
 647                 goto out;
 648         }
 649         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 650
 651         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 652
 653         if (frag == 0) {
 654                 /* This is the first fragment of a new frame. */
 655                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 656                                                  rx->u.rx.queue, &(rx->skb));
 657                 if (rx->key && rx->key->alg == ALG_CCMP &&
 658                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 659                         /* Store CCMP PN so that we can verify that the next
 660                          * fragment has a sequential PN value. */
 661                         entry->ccmp = 1;
 662                         memcpy(entry->last_pn,
 663                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 664                                CCMP_PN_LEN);
 665                 }
 666                 return TXRX_QUEUED;
 667         }
 668
 669         /* This is a fragment for a frame that should already be pending in
 670          * fragment cache. Add this fragment to the end of the pending entry.
 671          */
 672         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 673                                           rx->u.rx.queue, hdr);
 674         if (!entry) {
 675                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 676                 return TXRX_DROP;
 677         }
 678
 679         /* Verify that MPDUs within one MSDU have sequential PN values.
 680          * (IEEE 802.11i, 8.3.3.4.5) */
 681         if (entry->ccmp) {
 682                 int i;
 683                 u8 pn[CCMP_PN_LEN], *rpn;
 684                 if (!rx->key || rx->key->alg != ALG_CCMP)
 685                         return TXRX_DROP;
 686                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 687                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 688                         pn[i]++;
 689                         if (pn[i])
 690                                 break;
 691                 }
 692                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
 693                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
 694                         printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
 695                                " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
 696                                "(expected %02x%02x%02x%02x%02x%02x)\n",
 697                                rx->dev->name, MAC_ARG(hdr->addr2),
 698                                rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
 699                                pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
 700                         return TXRX_DROP;
 701                 }
 702                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 703         }
 704
 705         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 706         __skb_queue_tail(&entry->skb_list, rx->skb);
 707         entry->last_frag = frag;
 708         entry->extra_len += rx->skb->len;
 709         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 710                 rx->skb = NULL;
 711                 return TXRX_QUEUED;
 712         }
 713
 714         rx->skb = __skb_dequeue(&entry->skb_list);
 715         if (skb_tailroom(rx->skb) < entry->extra_len) {
 716                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 717                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 718                                               GFP_ATOMIC))) {
 719                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 720                         __skb_queue_purge(&entry->skb_list);
 721                         return TXRX_DROP;
 722                 }
 723         }
 724         while ((skb = __skb_dequeue(&entry->skb_list))) {
 725                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 726                 dev_kfree_skb(skb);
 727         }
 728
 729         /* Complete frame has been reassembled - process it now */
 730         rx->fragmented = 1;
 731
 732  out:
 733         if (rx->sta)
 734                 rx->sta->rx_packets++;
 735         if (is_multicast_ether_addr(hdr->addr1))
 736                 rx->local->dot11MulticastReceivedFrameCount++;
 737         else
 738                 ieee80211_led_rx(rx->local);
 739         return TXRX_CONTINUE;
 740 }
 741
 742 static ieee80211_txrx_result
 743 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 744 {
 745         struct sk_buff *skb;
 746         int no_pending_pkts;
 747
 748         if (likely(!rx->sta ||
 749                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 750                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 751                    !rx->u.rx.ra_match))
 752                 return TXRX_CONTINUE;
 753
 754         skb = skb_dequeue(&rx->sta->tx_filtered);
 755         if (!skb) {
 756                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 757                 if (skb)
 758                         rx->local->total_ps_buffered--;
 759         }
 760         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 761                 skb_queue_empty(&rx->sta->ps_tx_buf);
 762
 763         if (skb) {
 764                 struct ieee80211_hdr *hdr =
 765                         (struct ieee80211_hdr *) skb->data;
 766
 767                 /* tell TX path to send one frame even though the STA may
 768                  * still remain is PS mode after this frame exchange */
 769                 rx->sta->pspoll = 1;
 770
 771 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 772                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
 773                        "after %d)\n",
 774                        MAC_ARG(rx->sta->addr), rx->sta->aid,
 775                        skb_queue_len(&rx->sta->ps_tx_buf));
 776 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 777
 778                 /* Use MoreData flag to indicate whether there are more
 779                  * buffered frames for this STA */
 780                 if (no_pending_pkts) {
 781                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 782                         rx->sta->flags &= ~WLAN_STA_TIM;
 783                 } else
 784                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 785
 786                 dev_queue_xmit(skb);
 787
 788                 if (no_pending_pkts) {
 789                         if (rx->local->ops->set_tim)
 790                                 rx->local->ops->set_tim(local_to_hw(rx->local),
 791                                                        rx->sta->aid, 0);
 792                         if (rx->sdata->bss)
 793                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
 794                 }
 795 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 796         } else if (!rx->u.rx.sent_ps_buffered) {
 797                 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
 798                        "though there is no buffered frames for it\n",
 799                        rx->dev->name, MAC_ARG(rx->sta->addr));
 800 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 801
 802         }
 803
 804         /* Free PS Poll skb here instead of returning TXRX_DROP that would
 805          * count as an dropped frame. */
 806         dev_kfree_skb(rx->skb);
 807
 808         return TXRX_QUEUED;
 809 }
 810
 811 static ieee80211_txrx_result
 812 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 813 {
 814         u16 fc = rx->fc;
 815         u8 *data = rx->skb->data;
 816         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 817
 818         if (!WLAN_FC_IS_QOS_DATA(fc))
 819                 return TXRX_CONTINUE;
 820
 821         /* remove the qos control field, update frame type and meta-data */
 822         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
 823         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
 824         /* change frame type to non QOS */
 825         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 826         hdr->frame_control = cpu_to_le16(fc);
 827
 828         return TXRX_CONTINUE;
 829 }
 830
 831 static ieee80211_txrx_result
 832 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
 833 {
 834         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
 835             rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
 836                 /* Pass both encrypted and unencrypted EAPOL frames to user
 837                  * space for processing. */
 838                 if (!rx->local->apdev)
 839                         return TXRX_DROP;
 840                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
 841                                   ieee80211_msg_normal);
 842                 return TXRX_QUEUED;
 843         }
 844
 845         if (unlikely(rx->sdata->ieee802_1x &&
 846                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 847                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 848                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
 849                      !ieee80211_is_eapol(rx->skb))) {
 850 #ifdef CONFIG_MAC80211_DEBUG
 851                 struct ieee80211_hdr *hdr =
 852                         (struct ieee80211_hdr *) rx->skb->data;
 853                 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
 854                        " (unauthorized port)\n", rx->dev->name,
 855                        MAC_ARG(hdr->addr2));
 856 #endif /* CONFIG_MAC80211_DEBUG */
 857                 return TXRX_DROP;
 858         }
 859
 860         return TXRX_CONTINUE;
 861 }
 862
 863 static ieee80211_txrx_result
 864 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
 865 {
 866         /*  If the device handles decryption totally, skip this test */
 867         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
 868                 return TXRX_CONTINUE;
 869
 870         /* Drop unencrypted frames if key is set. */
 871         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
 872                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 873                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 874                      (rx->key || rx->sdata->drop_unencrypted) &&
 875                      (rx->sdata->eapol == 0 ||
 876                       !ieee80211_is_eapol(rx->skb)))) {
 877                 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
 878                        "encryption\n", rx->dev->name);
 879                 return TXRX_DROP;
 880         }
 881         return TXRX_CONTINUE;
 882 }
 883
 884 static ieee80211_txrx_result
 885 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 886 {
 887         struct net_device *dev = rx->dev;
 888         struct ieee80211_local *local = rx->local;
 889         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 890         u16 fc, hdrlen, ethertype;
 891         u8 *payload;
 892         u8 dst[ETH_ALEN];
 893         u8 src[ETH_ALEN];
 894         struct sk_buff *skb = rx->skb, *skb2;
 895         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 896
 897         fc = rx->fc;
 898         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
 899                 return TXRX_CONTINUE;
 900
 901         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
 902                 return TXRX_DROP;
 903
 904         hdrlen = ieee80211_get_hdrlen(fc);
 905
 906         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 907          * header
 908          * IEEE 802.11 address fields:
 909          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 910          *   0     0   DA    SA    BSSID n/a
 911          *   0     1   DA    BSSID SA    n/a
 912          *   1     0   BSSID SA    DA    n/a
 913          *   1     1   RA    TA    DA    SA
 914          */
 915
 916         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 917         case IEEE80211_FCTL_TODS:
 918                 /* BSSID SA DA */
 919                 memcpy(dst, hdr->addr3, ETH_ALEN);
 920                 memcpy(src, hdr->addr2, ETH_ALEN);
 921
 922                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
 923                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
 924                         printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
 925                                MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
 926                                dev->name, MAC_ARG(hdr->addr1),
 927                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
 928                         return TXRX_DROP;
 929                 }
 930                 break;
 931         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 932                 /* RA TA DA SA */
 933                 memcpy(dst, hdr->addr3, ETH_ALEN);
 934                 memcpy(src, hdr->addr4, ETH_ALEN);
 935
 936                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
 937                         printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
 938                                MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
 939                                MAC_FMT ")\n",
 940                                rx->dev->name, MAC_ARG(hdr->addr1),
 941                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
 942                                MAC_ARG(hdr->addr4));
 943                         return TXRX_DROP;
 944                 }
 945                 break;
 946         case IEEE80211_FCTL_FROMDS:
 947                 /* DA BSSID SA */
 948                 memcpy(dst, hdr->addr1, ETH_ALEN);
 949                 memcpy(src, hdr->addr3, ETH_ALEN);
 950
 951                 if (sdata->type != IEEE80211_IF_TYPE_STA) {
 952                         return TXRX_DROP;
 953                 }
 954                 break;
 955         case 0:
 956                 /* DA SA BSSID */
 957                 memcpy(dst, hdr->addr1, ETH_ALEN);
 958                 memcpy(src, hdr->addr2, ETH_ALEN);
 959
 960                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
 961                         if (net_ratelimit()) {
 962                                 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
 963                                        MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
 964                                        ")\n",
 965                                        dev->name, MAC_ARG(hdr->addr1),
 966                                        MAC_ARG(hdr->addr2),
 967                                        MAC_ARG(hdr->addr3));
 968                         }
 969                         return TXRX_DROP;
 970                 }
 971                 break;
 972         }
 973
 974         payload = skb->data + hdrlen;
 975
 976         if (unlikely(skb->len - hdrlen < 8)) {
 977                 if (net_ratelimit()) {
 978                         printk(KERN_DEBUG "%s: RX too short data frame "
 979                                "payload\n", dev->name);
 980                 }
 981                 return TXRX_DROP;
 982         }
 983
 984         ethertype = (payload[6] << 8) | payload[7];
 985
 986         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 987                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 988                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 989                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 990                  * replace EtherType */
 991                 skb_pull(skb, hdrlen + 6);
 992                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 993                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 994         } else {
 995                 struct ethhdr *ehdr;
 996                 __be16 len;
 997                 skb_pull(skb, hdrlen);
 998                 len = htons(skb->len);
 999                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1000                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1001                 memcpy(ehdr->h_source, src, ETH_ALEN);
1002                 ehdr->h_proto = len;
1003         }
1004         skb->dev = dev;
1005
1006         skb2 = NULL;
1007
1008         sdata->stats.rx_packets++;
1009         sdata->stats.rx_bytes += skb->len;
1010
1011         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1012             || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
1013                 if (is_multicast_ether_addr(skb->data)) {
1014                         /* send multicast frames both to higher layers in
1015                          * local net stack and back to the wireless media */
1016                         skb2 = skb_copy(skb, GFP_ATOMIC);
1017                         if (!skb2)
1018                                 printk(KERN_DEBUG "%s: failed to clone "
1019                                        "multicast frame\n", dev->name);
1020                 } else {
1021                         struct sta_info *dsta;
1022                         dsta = sta_info_get(local, skb->data);
1023                         if (dsta && !dsta->dev) {
1024                                 printk(KERN_DEBUG "Station with null dev "
1025                                        "structure!\n");
1026                         } else if (dsta && dsta->dev == dev) {
1027                                 /* Destination station is associated to this
1028                                  * AP, so send the frame directly to it and
1029                                  * do not pass the frame to local net stack.
1030                                  */
1031                                 skb2 = skb;
1032                                 skb = NULL;
1033                         }
1034                         if (dsta)
1035                                 sta_info_put(dsta);
1036                 }
1037         }
1038
1039         if (skb) {
1040                 /* deliver to local stack */
1041                 skb->protocol = eth_type_trans(skb, dev);
1042                 memset(skb->cb, 0, sizeof(skb->cb));
1043                 netif_rx(skb);
1044         }
1045
1046         if (skb2) {
1047                 /* send to wireless media */
1048                 skb2->protocol = __constant_htons(ETH_P_802_3);
1049                 skb_set_network_header(skb2, 0);
1050                 skb_set_mac_header(skb2, 0);
1051                 dev_queue_xmit(skb2);
1052         }
1053
1054         return TXRX_QUEUED;
1055 }
1056
1057 static ieee80211_txrx_result
1058 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1059 {
1060         struct ieee80211_sub_if_data *sdata;
1061
1062         if (!rx->u.rx.ra_match)
1063                 return TXRX_DROP;
1064
1065         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1066         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1067              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1068             !rx->local->user_space_mlme) {
1069                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1070         } else {
1071                 /* Management frames are sent to hostapd for processing */
1072                 if (!rx->local->apdev)
1073                         return TXRX_DROP;
1074                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1075                                   ieee80211_msg_normal);
1076         }
1077         return TXRX_QUEUED;
1078 }
1079
1080 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1081                                 struct ieee80211_local *local,
1082                                 ieee80211_rx_handler *handlers,
1083                                 struct ieee80211_txrx_data *rx,
1084                                 struct sta_info *sta)
1085 {
1086         ieee80211_rx_handler *handler;
1087         ieee80211_txrx_result res = TXRX_DROP;
1088
1089         for (handler = handlers; *handler != NULL; handler++) {
1090                 res = (*handler)(rx);
1091
1092                 switch (res) {
1093                 case TXRX_CONTINUE:
1094                         continue;
1095                 case TXRX_DROP:
1096                         I802_DEBUG_INC(local->rx_handlers_drop);
1097                         if (sta)
1098                                 sta->rx_dropped++;
1099                         break;
1100                 case TXRX_QUEUED:
1101                         I802_DEBUG_INC(local->rx_handlers_queued);
1102                         break;
1103                 }
1104                 break;
1105         }
1106
1107         if (res == TXRX_DROP)
1108                 dev_kfree_skb(rx->skb);
1109         return res;
1110 }
1111
1112 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1113                                                 ieee80211_rx_handler *handlers,
1114                                                 struct ieee80211_txrx_data *rx,
1115                                                 struct sta_info *sta)
1116 {
1117         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1118             TXRX_CONTINUE)
1119                 dev_kfree_skb(rx->skb);
1120 }
1121
1122 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1123                                             struct ieee80211_hdr *hdr,
1124                                             struct sta_info *sta,
1125                                             struct ieee80211_txrx_data *rx)
1126 {
1127         int keyidx, hdrlen;
1128
1129         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1130         if (rx->skb->len >= hdrlen + 4)
1131                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1132         else
1133                 keyidx = -1;
1134
1135         /* TODO: verify that this is not triggered by fragmented
1136          * frames (hw does not verify MIC for them). */
1137         printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1138                "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1139                dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
1140
1141         if (!sta) {
1142                 /* Some hardware versions seem to generate incorrect
1143                  * Michael MIC reports; ignore them to avoid triggering
1144                  * countermeasures. */
1145                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1146                        "error for unknown address " MAC_FMT "\n",
1147                        dev->name, MAC_ARG(hdr->addr2));
1148                 goto ignore;
1149         }
1150
1151         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1152                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1153                        "error for a frame with no ISWEP flag (src "
1154                        MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1155                 goto ignore;
1156         }
1157
1158         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1159             rx->sdata->type == IEEE80211_IF_TYPE_AP) {
1160                 keyidx = ieee80211_wep_get_keyidx(rx->skb);
1161                 /* AP with Pairwise keys support should never receive Michael
1162                  * MIC errors for non-zero keyidx because these are reserved
1163                  * for group keys and only the AP is sending real multicast
1164                  * frames in BSS. */
1165                 if (keyidx) {
1166                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1167                                "a frame with non-zero keyidx (%d) (src " MAC_FMT
1168                                ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
1169                         goto ignore;
1170                 }
1171         }
1172
1173         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1174             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1175              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1176                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1177                        "error for a frame that cannot be encrypted "
1178                        "(fc=0x%04x) (src " MAC_FMT ")\n",
1179                        dev->name, rx->fc, MAC_ARG(hdr->addr2));
1180                 goto ignore;
1181         }
1182
1183         do {
1184                 union iwreq_data wrqu;
1185                 char *buf = kmalloc(128, GFP_ATOMIC);
1186                 if (!buf)
1187                         break;
1188
1189                 /* TODO: needed parameters: count, key type, TSC */
1190                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
1191                         "keyid=%d %scast addr=" MAC_FMT ")",
1192                         keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
1193                         MAC_ARG(hdr->addr2));
1194                 memset(&wrqu, 0, sizeof(wrqu));
1195                 wrqu.data.length = strlen(buf);
1196                 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
1197                 kfree(buf);
1198         } while (0);
1199
1200         /* TODO: consider verifying the MIC error report with software
1201          * implementation if we get too many spurious reports from the
1202          * hardware. */
1203         if (!rx->local->apdev)
1204                 goto ignore;
1205         ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1206                           ieee80211_msg_michael_mic_failure);
1207         return;
1208
1209  ignore:
1210         dev_kfree_skb(rx->skb);
1211         rx->skb = NULL;
1212 }
1213
1214 ieee80211_rx_handler ieee80211_rx_handlers[] =
1215 {
1216         ieee80211_rx_h_if_stats,
1217         ieee80211_rx_h_monitor,
1218         ieee80211_rx_h_passive_scan,
1219         ieee80211_rx_h_check,
1220         ieee80211_rx_h_load_key,
1221         ieee80211_rx_h_sta_process,
1222         ieee80211_rx_h_ccmp_decrypt,
1223         ieee80211_rx_h_tkip_decrypt,
1224         ieee80211_rx_h_wep_weak_iv_detection,
1225         ieee80211_rx_h_wep_decrypt,
1226         ieee80211_rx_h_defragment,
1227         ieee80211_rx_h_ps_poll,
1228         ieee80211_rx_h_michael_mic_verify,
1229         /* this must be after decryption - so header is counted in MPDU mic
1230          * must be before pae and data, so QOS_DATA format frames
1231          * are not passed to user space by these functions
1232          */
1233         ieee80211_rx_h_remove_qos_control,
1234         ieee80211_rx_h_802_1x_pae,
1235         ieee80211_rx_h_drop_unencrypted,
1236         ieee80211_rx_h_data,
1237         ieee80211_rx_h_mgmt,
1238         NULL
1239 };
1240
1241 /* main receive path */
1242
1243 /*
1244  * This is the receive path handler. It is called by a low level driver when an
1245  * 802.11 MPDU is received from the hardware.
1246  */
1247 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1248                     struct ieee80211_rx_status *status)
1249 {
1250         struct ieee80211_local *local = hw_to_local(hw);
1251         struct ieee80211_sub_if_data *sdata;
1252         struct sta_info *sta;
1253         struct ieee80211_hdr *hdr;
1254         struct ieee80211_txrx_data rx;
1255         u16 type;
1256         int multicast;
1257         int radiotap_len = 0;
1258         struct ieee80211_sub_if_data *prev = NULL;
1259         struct sk_buff *skb_new;
1260         u8 *bssid;
1261
1262         if (status->flag & RX_FLAG_RADIOTAP) {
1263                 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1264                 skb_pull(skb, radiotap_len);
1265         }
1266
1267         hdr = (struct ieee80211_hdr *) skb->data;
1268         memset(&rx, 0, sizeof(rx));
1269         rx.skb = skb;
1270         rx.local = local;
1271
1272         rx.u.rx.status = status;
1273         rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1274         type = rx.fc & IEEE80211_FCTL_FTYPE;
1275         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1276                 local->dot11ReceivedFragmentCount++;
1277         multicast = is_multicast_ether_addr(hdr->addr1);
1278
1279         if (skb->len >= 16)
1280                 sta = rx.sta = sta_info_get(local, hdr->addr2);
1281         else
1282                 sta = rx.sta = NULL;
1283
1284         if (sta) {
1285                 rx.dev = sta->dev;
1286                 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1287         }
1288
1289         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1290                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1291                 goto end;
1292         }
1293
1294         if (unlikely(local->sta_scanning))
1295                 rx.u.rx.in_scan = 1;
1296
1297         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1298                                            sta) != TXRX_CONTINUE)
1299                 goto end;
1300         skb = rx.skb;
1301
1302         skb_push(skb, radiotap_len);
1303         if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1304             !local->iff_promiscs && !multicast) {
1305                 rx.u.rx.ra_match = 1;
1306                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1307                                              sta);
1308                 sta_info_put(sta);
1309                 return;
1310         }
1311
1312         bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1313
1314         read_lock(&local->sub_if_lock);
1315         list_for_each_entry(sdata, &local->sub_if_list, list) {
1316                 rx.u.rx.ra_match = 1;
1317                 switch (sdata->type) {
1318                 case IEEE80211_IF_TYPE_STA:
1319                         if (!bssid)
1320                                 continue;
1321                         if (!ieee80211_bssid_match(bssid,
1322                                                    sdata->u.sta.bssid)) {
1323                                 if (!rx.u.rx.in_scan)
1324                                         continue;
1325                                 rx.u.rx.ra_match = 0;
1326                         } else if (!multicast &&
1327                                    compare_ether_addr(sdata->dev->dev_addr,
1328                                                       hdr->addr1) != 0) {
1329                                 if (!sdata->promisc)
1330                                         continue;
1331                                 rx.u.rx.ra_match = 0;
1332                         }
1333                         break;
1334                 case IEEE80211_IF_TYPE_IBSS:
1335                         if (!bssid)
1336                                 continue;
1337                         if (!ieee80211_bssid_match(bssid,
1338                                                 sdata->u.sta.bssid)) {
1339                                 if (!rx.u.rx.in_scan)
1340                                         continue;
1341                                 rx.u.rx.ra_match = 0;
1342                         } else if (!multicast &&
1343                                    compare_ether_addr(sdata->dev->dev_addr,
1344                                                       hdr->addr1) != 0) {
1345                                 if (!sdata->promisc)
1346                                         continue;
1347                                 rx.u.rx.ra_match = 0;
1348                         } else if (!sta)
1349                                 sta = rx.sta =
1350                                         ieee80211_ibss_add_sta(sdata->dev,
1351                                                                skb, bssid,
1352                                                                hdr->addr2);
1353                         break;
1354                 case IEEE80211_IF_TYPE_AP:
1355                         if (!bssid) {
1356                                 if (compare_ether_addr(sdata->dev->dev_addr,
1357                                                        hdr->addr1))
1358                                         continue;
1359                         } else if (!ieee80211_bssid_match(bssid,
1360                                                 sdata->dev->dev_addr)) {
1361                                 if (!rx.u.rx.in_scan)
1362                                         continue;
1363                                 rx.u.rx.ra_match = 0;
1364                         }
1365                         if (sdata->dev == local->mdev && !rx.u.rx.in_scan)
1366                                 /* do not receive anything via
1367                                  * master device when not scanning */
1368                                 continue;
1369                         break;
1370                 case IEEE80211_IF_TYPE_WDS:
1371                         if (bssid ||
1372                             (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1373                                 continue;
1374                         if (compare_ether_addr(sdata->u.wds.remote_addr,
1375                                                hdr->addr2))
1376                                 continue;
1377                         break;
1378                 }
1379
1380                 if (prev) {
1381                         skb_new = skb_copy(skb, GFP_ATOMIC);
1382                         if (!skb_new) {
1383                                 if (net_ratelimit())
1384                                         printk(KERN_DEBUG "%s: failed to copy "
1385                                                "multicast frame for %s",
1386                                                local->mdev->name, prev->dev->name);
1387                                 continue;
1388                         }
1389                         rx.skb = skb_new;
1390                         rx.dev = prev->dev;
1391                         rx.sdata = prev;
1392                         ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1393                                                      &rx, sta);
1394                 }
1395                 prev = sdata;
1396         }
1397         if (prev) {
1398                 rx.skb = skb;
1399                 rx.dev = prev->dev;
1400                 rx.sdata = prev;
1401                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1402                                              &rx, sta);
1403         } else
1404                 dev_kfree_skb(skb);
1405         read_unlock(&local->sub_if_lock);
1406
1407  end:
1408         if (sta)
1409                 sta_info_put(sta);
1410 }
1411 EXPORT_SYMBOL(__ieee80211_rx);
1412
1413 /* This is a version of the rx handler that can be called from hard irq
1414  * context. Post the skb on the queue and schedule the tasklet */
1415 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1416                           struct ieee80211_rx_status *status)
1417 {
1418         struct ieee80211_local *local = hw_to_local(hw);
1419
1420         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1421
1422         skb->dev = local->mdev;
1423         /* copy status into skb->cb for use by tasklet */
1424         memcpy(skb->cb, status, sizeof(*status));
1425         skb->pkt_type = IEEE80211_RX_MSG;
1426         skb_queue_tail(&local->skb_queue, skb);
1427         tasklet_schedule(&local->tasklet);
1428 }
1429 EXPORT_SYMBOL(ieee80211_rx_irqsafe);