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  * The sta value should also not be used because it may
  32  * be NULL even though a STA (in IBSS mode) will be added.
  33  */
  34
  35 static ieee80211_txrx_result
  36 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
  37 {
  38         u8 *data = rx->skb->data;
  39         int tid;
  40
  41         /* does the frame have a qos control field? */
  42         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
  43                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
  44                 /* frame has qos control */
  45                 tid = qc[0] & QOS_CONTROL_TID_MASK;
  46         } else {
  47                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
  48                         /* Separate TID for management frames */
  49                         tid = NUM_RX_DATA_QUEUES - 1;
  50                 } else {
  51                         /* no qos control present */
  52                         tid = 0; /* 802.1d - Best Effort */
  53                 }
  54         }
  55
  56         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
  57         /* only a debug counter, sta might not be assigned properly yet */
  58         if (rx->sta)
  59                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
  60
  61         rx->u.rx.queue = tid;
  62         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
  63          * For now, set skb->priority to 0 for other cases. */
  64         rx->skb->priority = (tid > 7) ? 0 : tid;
  65
  66         return TXRX_CONTINUE;
  67 }
  68
  69 static ieee80211_txrx_result
  70 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
  71 {
  72         struct ieee80211_local *local = rx->local;
  73         struct sk_buff *skb = rx->skb;
  74         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  75         u32 load = 0, hdrtime;
  76         struct ieee80211_rate *rate;
  77         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
  78         int i;
  79
  80         /* Estimate total channel use caused by this frame */
  81
  82         if (unlikely(mode->num_rates < 0))
  83                 return TXRX_CONTINUE;
  84
  85         rate = &mode->rates[0];
  86         for (i = 0; i < mode->num_rates; i++) {
  87                 if (mode->rates[i].val == rx->u.rx.status->rate) {
  88                         rate = &mode->rates[i];
  89                         break;
  90                 }
  91         }
  92
  93         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
  94          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
  95
  96         if (mode->mode == MODE_IEEE80211A ||
  97             mode->mode == MODE_ATHEROS_TURBO ||
  98             mode->mode == MODE_ATHEROS_TURBOG ||
  99             (mode->mode == MODE_IEEE80211G &&
 100              rate->flags & IEEE80211_RATE_ERP))
 101                 hdrtime = CHAN_UTIL_HDR_SHORT;
 102         else
 103                 hdrtime = CHAN_UTIL_HDR_LONG;
 104
 105         load = hdrtime;
 106         if (!is_multicast_ether_addr(hdr->addr1))
 107                 load += hdrtime;
 108
 109         load += skb->len * rate->rate_inv;
 110
 111         /* Divide channel_use by 8 to avoid wrapping around the counter */
 112         load >>= CHAN_UTIL_SHIFT;
 113         local->channel_use_raw += load;
 114         rx->u.rx.load = load;
 115
 116         return TXRX_CONTINUE;
 117 }
 118
 119 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 120 {
 121         ieee80211_rx_h_parse_qos,
 122         ieee80211_rx_h_load_stats,
 123         NULL
 124 };
 125
 126 /* rx handlers */
 127
 128 static ieee80211_txrx_result
 129 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
 130 {
 131         if (rx->sta)
 132                 rx->sta->channel_use_raw += rx->u.rx.load;
 133         rx->sdata->channel_use_raw += rx->u.rx.load;
 134         return TXRX_CONTINUE;
 135 }
 136
 137 static void
 138 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
 139                      struct ieee80211_rx_status *status)
 140 {
 141         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 142         struct ieee80211_sub_if_data *sdata;
 143         struct ieee80211_rate *rate;
 144         struct ieee80211_rtap_hdr {
 145                 struct ieee80211_radiotap_header hdr;
 146                 u8 flags;
 147                 u8 rate;
 148                 __le16 chan_freq;
 149                 __le16 chan_flags;
 150                 u8 antsignal;
 151         } __attribute__ ((packed)) *rthdr;
 152
 153         skb->dev = dev;
 154
 155         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 156
 157         if (status->flag & RX_FLAG_RADIOTAP)
 158                 goto out;
 159
 160         if (skb_headroom(skb) < sizeof(*rthdr)) {
 161                 I802_DEBUG_INC(local->rx_expand_skb_head);
 162                 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
 163                         dev_kfree_skb(skb);
 164                         return;
 165                 }
 166         }
 167
 168         rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
 169         memset(rthdr, 0, sizeof(*rthdr));
 170         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 171         rthdr->hdr.it_present =
 172                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 173                             (1 << IEEE80211_RADIOTAP_RATE) |
 174                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 175                             (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
 176         rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
 177                        IEEE80211_RADIOTAP_F_FCS : 0;
 178         rate = ieee80211_get_rate(local, status->phymode, status->rate);
 179         if (rate)
 180                 rthdr->rate = rate->rate / 5;
 181         rthdr->chan_freq = cpu_to_le16(status->freq);
 182         rthdr->chan_flags =
 183                 status->phymode == MODE_IEEE80211A ?
 184                 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
 185                 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
 186         rthdr->antsignal = status->ssi;
 187
 188  out:
 189         sdata->stats.rx_packets++;
 190         sdata->stats.rx_bytes += skb->len;
 191
 192         skb_set_mac_header(skb, 0);
 193         skb->ip_summed = CHECKSUM_UNNECESSARY;
 194         skb->pkt_type = PACKET_OTHERHOST;
 195         skb->protocol = htons(ETH_P_802_2);
 196         memset(skb->cb, 0, sizeof(skb->cb));
 197         netif_rx(skb);
 198 }
 199
 200 static ieee80211_txrx_result
 201 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
 202 {
 203         if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
 204                 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
 205                 return TXRX_QUEUED;
 206         }
 207
 208         if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
 209                 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
 210
 211         return TXRX_CONTINUE;
 212 }
 213
 214 static ieee80211_txrx_result
 215 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
 216 {
 217         struct ieee80211_local *local = rx->local;
 218         struct sk_buff *skb = rx->skb;
 219
 220         if (unlikely(local->sta_scanning != 0)) {
 221                 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
 222                 return TXRX_QUEUED;
 223         }
 224
 225         if (unlikely(rx->u.rx.in_scan)) {
 226                 /* scanning finished during invoking of handlers */
 227                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 228                 return TXRX_DROP;
 229         }
 230
 231         return TXRX_CONTINUE;
 232 }
 233
 234 static ieee80211_txrx_result
 235 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 236 {
 237         struct ieee80211_hdr *hdr;
 238         hdr = (struct ieee80211_hdr *) rx->skb->data;
 239
 240         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 241         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 242                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
 243                              rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
 244                              hdr->seq_ctrl)) {
 245                         if (rx->u.rx.ra_match) {
 246                                 rx->local->dot11FrameDuplicateCount++;
 247                                 rx->sta->num_duplicates++;
 248                         }
 249                         return TXRX_DROP;
 250                 } else
 251                         rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
 252         }
 253
 254         if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
 255             rx->skb->len > FCS_LEN)
 256                 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
 257
 258         if (unlikely(rx->skb->len < 16)) {
 259                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 260                 return TXRX_DROP;
 261         }
 262
 263         if (!rx->u.rx.ra_match)
 264                 rx->skb->pkt_type = PACKET_OTHERHOST;
 265         else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
 266                 rx->skb->pkt_type = PACKET_HOST;
 267         else if (is_multicast_ether_addr(hdr->addr1)) {
 268                 if (is_broadcast_ether_addr(hdr->addr1))
 269                         rx->skb->pkt_type = PACKET_BROADCAST;
 270                 else
 271                         rx->skb->pkt_type = PACKET_MULTICAST;
 272         } else
 273                 rx->skb->pkt_type = PACKET_OTHERHOST;
 274
 275         /* Drop disallowed frame classes based on STA auth/assoc state;
 276          * IEEE 802.11, Chap 5.5.
 277          *
 278          * 80211.o does filtering only based on association state, i.e., it
 279          * drops Class 3 frames from not associated stations. hostapd sends
 280          * deauth/disassoc frames when needed. In addition, hostapd is
 281          * responsible for filtering on both auth and assoc states.
 282          */
 283         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
 284                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
 285                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
 286                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 287                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
 288                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
 289                      !(rx->fc & IEEE80211_FCTL_TODS) &&
 290                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
 291                     || !rx->u.rx.ra_match) {
 292                         /* Drop IBSS frames and frames for other hosts
 293                          * silently. */
 294                         return TXRX_DROP;
 295                 }
 296
 297                 if (!rx->local->apdev)
 298                         return TXRX_DROP;
 299
 300                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
 301                                   ieee80211_msg_sta_not_assoc);
 302                 return TXRX_QUEUED;
 303         }
 304
 305         return TXRX_CONTINUE;
 306 }
 307
 308
 309 static ieee80211_txrx_result
 310 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
 311 {
 312         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 313         int always_sta_key;
 314
 315         if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
 316                 always_sta_key = 0;
 317         else
 318                 always_sta_key = 1;
 319
 320         if (rx->sta && rx->sta->key && always_sta_key) {
 321                 rx->key = rx->sta->key;
 322         } else {
 323                 if (rx->sta && rx->sta->key)
 324                         rx->key = rx->sta->key;
 325                 else
 326                         rx->key = rx->sdata->default_key;
 327
 328                 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
 329                     rx->fc & IEEE80211_FCTL_PROTECTED) {
 330                         int keyidx = ieee80211_wep_get_keyidx(rx->skb);
 331
 332                         if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
 333                             (!rx->sta || !rx->sta->key || keyidx > 0))
 334                                 rx->key = rx->sdata->keys[keyidx];
 335
 336                         if (!rx->key) {
 337                                 if (!rx->u.rx.ra_match)
 338                                         return TXRX_DROP;
 339                                 printk(KERN_DEBUG "%s: RX WEP frame with "
 340                                        "unknown keyidx %d (A1=" MAC_FMT " A2="
 341                                        MAC_FMT " A3=" MAC_FMT ")\n",
 342                                        rx->dev->name, keyidx,
 343                                        MAC_ARG(hdr->addr1),
 344                                        MAC_ARG(hdr->addr2),
 345                                        MAC_ARG(hdr->addr3));
 346                                 if (!rx->local->apdev)
 347                                         return TXRX_DROP;
 348                                 ieee80211_rx_mgmt(
 349                                         rx->local, rx->skb, rx->u.rx.status,
 350                                         ieee80211_msg_wep_frame_unknown_key);
 351                                 return TXRX_QUEUED;
 352                         }
 353                 }
 354         }
 355
 356         if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
 357                 rx->key->tx_rx_count++;
 358                 if (unlikely(rx->local->key_tx_rx_threshold &&
 359                              rx->key->tx_rx_count >
 360                              rx->local->key_tx_rx_threshold)) {
 361                         ieee80211_key_threshold_notify(rx->dev, rx->key,
 362                                                        rx->sta);
 363                 }
 364         }
 365
 366         return TXRX_CONTINUE;
 367 }
 368
 369 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 370 {
 371         struct ieee80211_sub_if_data *sdata;
 372         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 373
 374         if (sdata->bss)
 375                 atomic_inc(&sdata->bss->num_sta_ps);
 376         sta->flags |= WLAN_STA_PS;
 377         sta->pspoll = 0;
 378 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 379         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
 380                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 382 }
 383
 384 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 385 {
 386         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 387         struct sk_buff *skb;
 388         int sent = 0;
 389         struct ieee80211_sub_if_data *sdata;
 390         struct ieee80211_tx_packet_data *pkt_data;
 391
 392         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 393         if (sdata->bss)
 394                 atomic_dec(&sdata->bss->num_sta_ps);
 395         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
 396         sta->pspoll = 0;
 397         if (!skb_queue_empty(&sta->ps_tx_buf)) {
 398                 if (local->ops->set_tim)
 399                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
 400                 if (sdata->bss)
 401                         bss_tim_clear(local, sdata->bss, sta->aid);
 402         }
 403 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 404         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
 405                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 407         /* Send all buffered frames to the station */
 408         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 409                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 410                 sent++;
 411                 pkt_data->requeue = 1;
 412                 dev_queue_xmit(skb);
 413         }
 414         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 415                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 416                 local->total_ps_buffered--;
 417                 sent++;
 418 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 419                 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
 420                        "since STA not sleeping anymore\n", dev->name,
 421                        MAC_ARG(sta->addr), sta->aid);
 422 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 423                 pkt_data->requeue = 1;
 424                 dev_queue_xmit(skb);
 425         }
 426
 427         return sent;
 428 }
 429
 430 static ieee80211_txrx_result
 431 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 432 {
 433         struct sta_info *sta = rx->sta;
 434         struct net_device *dev = rx->dev;
 435         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 436
 437         if (!sta)
 438                 return TXRX_CONTINUE;
 439
 440         /* Update last_rx only for IBSS packets which are for the current
 441          * BSSID to avoid keeping the current IBSS network alive in cases where
 442          * other STAs are using different BSSID. */
 443         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
 444                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
 445                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 446                         sta->last_rx = jiffies;
 447         } else
 448         if (!is_multicast_ether_addr(hdr->addr1) ||
 449             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
 450                 /* Update last_rx only for unicast frames in order to prevent
 451                  * the Probe Request frames (the only broadcast frames from a
 452                  * STA in infrastructure mode) from keeping a connection alive.
 453                  */
 454                 sta->last_rx = jiffies;
 455         }
 456
 457         if (!rx->u.rx.ra_match)
 458                 return TXRX_CONTINUE;
 459
 460         sta->rx_fragments++;
 461         sta->rx_bytes += rx->skb->len;
 462         sta->last_rssi = (sta->last_rssi * 15 +
 463                           rx->u.rx.status->ssi) / 16;
 464         sta->last_signal = (sta->last_signal * 15 +
 465                             rx->u.rx.status->signal) / 16;
 466         sta->last_noise = (sta->last_noise * 15 +
 467                            rx->u.rx.status->noise) / 16;
 468
 469         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
 470                 /* Change STA power saving mode only in the end of a frame
 471                  * exchange sequence */
 472                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
 473                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
 474                 else if (!(sta->flags & WLAN_STA_PS) &&
 475                          (rx->fc & IEEE80211_FCTL_PM))
 476                         ap_sta_ps_start(dev, sta);
 477         }
 478
 479         /* Drop data::nullfunc frames silently, since they are used only to
 480          * control station power saving mode. */
 481         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 482             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
 483                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 484                 /* Update counter and free packet here to avoid counting this
 485                  * as a dropped packed. */
 486                 sta->rx_packets++;
 487                 dev_kfree_skb(rx->skb);
 488                 return TXRX_QUEUED;
 489         }
 490
 491         return TXRX_CONTINUE;
 492 } /* ieee80211_rx_h_sta_process */
 493
 494 static ieee80211_txrx_result
 495 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
 496 {
 497         if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 498             (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
 499             !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
 500                 return TXRX_CONTINUE;
 501
 502         /* Check for weak IVs, if hwaccel did not remove IV from the frame */
 503         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
 504             rx->key->force_sw_encrypt) {
 505                 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
 506                 if (iv) {
 507                         rx->sta->wep_weak_iv_count++;
 508                 }
 509         }
 510
 511         return TXRX_CONTINUE;
 512 }
 513
 514 static ieee80211_txrx_result
 515 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
 516 {
 517         /* If the device handles decryption totally, skip this test */
 518         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
 519                 return TXRX_CONTINUE;
 520
 521         if ((rx->key && rx->key->alg != ALG_WEP) ||
 522             !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 523             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
 524              ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 525               (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
 526                 return TXRX_CONTINUE;
 527
 528         if (!rx->key) {
 529                 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
 530                        rx->dev->name);
 531                 return TXRX_DROP;
 532         }
 533
 534         if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
 535             rx->key->force_sw_encrypt) {
 536                 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
 537                         printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
 538                                "failed\n", rx->dev->name);
 539                         return TXRX_DROP;
 540                 }
 541         } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
 542                 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
 543                 /* remove ICV */
 544                 skb_trim(rx->skb, rx->skb->len - 4);
 545         }
 546
 547         return TXRX_CONTINUE;
 548 }
 549
 550 static inline struct ieee80211_fragment_entry *
 551 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 552                          unsigned int frag, unsigned int seq, int rx_queue,
 553                          struct sk_buff **skb)
 554 {
 555         struct ieee80211_fragment_entry *entry;
 556         int idx;
 557
 558         idx = sdata->fragment_next;
 559         entry = &sdata->fragments[sdata->fragment_next++];
 560         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 561                 sdata->fragment_next = 0;
 562
 563         if (!skb_queue_empty(&entry->skb_list)) {
 564 #ifdef CONFIG_MAC80211_DEBUG
 565                 struct ieee80211_hdr *hdr =
 566                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 567                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 568                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 569                        "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
 570                        sdata->dev->name, idx,
 571                        jiffies - entry->first_frag_time, entry->seq,
 572                        entry->last_frag, MAC_ARG(hdr->addr1),
 573                        MAC_ARG(hdr->addr2));
 574 #endif /* CONFIG_MAC80211_DEBUG */
 575                 __skb_queue_purge(&entry->skb_list);
 576         }
 577
 578         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 579         *skb = NULL;
 580         entry->first_frag_time = jiffies;
 581         entry->seq = seq;
 582         entry->rx_queue = rx_queue;
 583         entry->last_frag = frag;
 584         entry->ccmp = 0;
 585         entry->extra_len = 0;
 586
 587         return entry;
 588 }
 589
 590 static inline struct ieee80211_fragment_entry *
 591 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 592                           u16 fc, unsigned int frag, unsigned int seq,
 593                           int rx_queue, struct ieee80211_hdr *hdr)
 594 {
 595         struct ieee80211_fragment_entry *entry;
 596         int i, idx;
 597
 598         idx = sdata->fragment_next;
 599         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 600                 struct ieee80211_hdr *f_hdr;
 601                 u16 f_fc;
 602
 603                 idx--;
 604                 if (idx < 0)
 605                         idx = IEEE80211_FRAGMENT_MAX - 1;
 606
 607                 entry = &sdata->fragments[idx];
 608                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 609                     entry->rx_queue != rx_queue ||
 610                     entry->last_frag + 1 != frag)
 611                         continue;
 612
 613                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 614                 f_fc = le16_to_cpu(f_hdr->frame_control);
 615
 616                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 617                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 618                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 619                         continue;
 620
 621                 if (entry->first_frag_time + 2 * HZ < jiffies) {
 622                         __skb_queue_purge(&entry->skb_list);
 623                         continue;
 624                 }
 625                 return entry;
 626         }
 627
 628         return NULL;
 629 }
 630
 631 static ieee80211_txrx_result
 632 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 633 {
 634         struct ieee80211_hdr *hdr;
 635         u16 sc;
 636         unsigned int frag, seq;
 637         struct ieee80211_fragment_entry *entry;
 638         struct sk_buff *skb;
 639
 640         hdr = (struct ieee80211_hdr *) rx->skb->data;
 641         sc = le16_to_cpu(hdr->seq_ctrl);
 642         frag = sc & IEEE80211_SCTL_FRAG;
 643
 644         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 645                    (rx->skb)->len < 24 ||
 646                    is_multicast_ether_addr(hdr->addr1))) {
 647                 /* not fragmented */
 648                 goto out;
 649         }
 650         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 651
 652         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 653
 654         if (frag == 0) {
 655                 /* This is the first fragment of a new frame. */
 656                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 657                                                  rx->u.rx.queue, &(rx->skb));
 658                 if (rx->key && rx->key->alg == ALG_CCMP &&
 659                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 660                         /* Store CCMP PN so that we can verify that the next
 661                          * fragment has a sequential PN value. */
 662                         entry->ccmp = 1;
 663                         memcpy(entry->last_pn,
 664                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 665                                CCMP_PN_LEN);
 666                 }
 667                 return TXRX_QUEUED;
 668         }
 669
 670         /* This is a fragment for a frame that should already be pending in
 671          * fragment cache. Add this fragment to the end of the pending entry.
 672          */
 673         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 674                                           rx->u.rx.queue, hdr);
 675         if (!entry) {
 676                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 677                 return TXRX_DROP;
 678         }
 679
 680         /* Verify that MPDUs within one MSDU have sequential PN values.
 681          * (IEEE 802.11i, 8.3.3.4.5) */
 682         if (entry->ccmp) {
 683                 int i;
 684                 u8 pn[CCMP_PN_LEN], *rpn;
 685                 if (!rx->key || rx->key->alg != ALG_CCMP)
 686                         return TXRX_DROP;
 687                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 688                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 689                         pn[i]++;
 690                         if (pn[i])
 691                                 break;
 692                 }
 693                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
 694                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
 695                         printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
 696                                " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
 697                                "(expected %02x%02x%02x%02x%02x%02x)\n",
 698                                rx->dev->name, MAC_ARG(hdr->addr2),
 699                                rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
 700                                pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
 701                         return TXRX_DROP;
 702                 }
 703                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 704         }
 705
 706         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 707         __skb_queue_tail(&entry->skb_list, rx->skb);
 708         entry->last_frag = frag;
 709         entry->extra_len += rx->skb->len;
 710         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 711                 rx->skb = NULL;
 712                 return TXRX_QUEUED;
 713         }
 714
 715         rx->skb = __skb_dequeue(&entry->skb_list);
 716         if (skb_tailroom(rx->skb) < entry->extra_len) {
 717                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 718                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 719                                               GFP_ATOMIC))) {
 720                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 721                         __skb_queue_purge(&entry->skb_list);
 722                         return TXRX_DROP;
 723                 }
 724         }
 725         while ((skb = __skb_dequeue(&entry->skb_list))) {
 726                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 727                 dev_kfree_skb(skb);
 728         }
 729
 730         /* Complete frame has been reassembled - process it now */
 731         rx->fragmented = 1;
 732
 733  out:
 734         if (rx->sta)
 735                 rx->sta->rx_packets++;
 736         if (is_multicast_ether_addr(hdr->addr1))
 737                 rx->local->dot11MulticastReceivedFrameCount++;
 738         else
 739                 ieee80211_led_rx(rx->local);
 740         return TXRX_CONTINUE;
 741 }
 742
 743 static ieee80211_txrx_result
 744 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 745 {
 746         struct sk_buff *skb;
 747         int no_pending_pkts;
 748
 749         if (likely(!rx->sta ||
 750                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 751                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 752                    !rx->u.rx.ra_match))
 753                 return TXRX_CONTINUE;
 754
 755         skb = skb_dequeue(&rx->sta->tx_filtered);
 756         if (!skb) {
 757                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 758                 if (skb)
 759                         rx->local->total_ps_buffered--;
 760         }
 761         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 762                 skb_queue_empty(&rx->sta->ps_tx_buf);
 763
 764         if (skb) {
 765                 struct ieee80211_hdr *hdr =
 766                         (struct ieee80211_hdr *) skb->data;
 767
 768                 /* tell TX path to send one frame even though the STA may
 769                  * still remain is PS mode after this frame exchange */
 770                 rx->sta->pspoll = 1;
 771
 772 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 773                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
 774                        "after %d)\n",
 775                        MAC_ARG(rx->sta->addr), rx->sta->aid,
 776                        skb_queue_len(&rx->sta->ps_tx_buf));
 777 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 778
 779                 /* Use MoreData flag to indicate whether there are more
 780                  * buffered frames for this STA */
 781                 if (no_pending_pkts) {
 782                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 783                         rx->sta->flags &= ~WLAN_STA_TIM;
 784                 } else
 785                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 786
 787                 dev_queue_xmit(skb);
 788
 789                 if (no_pending_pkts) {
 790                         if (rx->local->ops->set_tim)
 791                                 rx->local->ops->set_tim(local_to_hw(rx->local),
 792                                                        rx->sta->aid, 0);
 793                         if (rx->sdata->bss)
 794                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
 795                 }
 796 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 797         } else if (!rx->u.rx.sent_ps_buffered) {
 798                 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
 799                        "though there is no buffered frames for it\n",
 800                        rx->dev->name, MAC_ARG(rx->sta->addr));
 801 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 802
 803         }
 804
 805         /* Free PS Poll skb here instead of returning TXRX_DROP that would
 806          * count as an dropped frame. */
 807         dev_kfree_skb(rx->skb);
 808
 809         return TXRX_QUEUED;
 810 }
 811
 812 static ieee80211_txrx_result
 813 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 814 {
 815         u16 fc = rx->fc;
 816         u8 *data = rx->skb->data;
 817         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 818
 819         if (!WLAN_FC_IS_QOS_DATA(fc))
 820                 return TXRX_CONTINUE;
 821
 822         /* remove the qos control field, update frame type and meta-data */
 823         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
 824         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
 825         /* change frame type to non QOS */
 826         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 827         hdr->frame_control = cpu_to_le16(fc);
 828
 829         return TXRX_CONTINUE;
 830 }
 831
 832 static ieee80211_txrx_result
 833 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
 834 {
 835         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
 836             rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
 837                 /* Pass both encrypted and unencrypted EAPOL frames to user
 838                  * space for processing. */
 839                 if (!rx->local->apdev)
 840                         return TXRX_DROP;
 841                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
 842                                   ieee80211_msg_normal);
 843                 return TXRX_QUEUED;
 844         }
 845
 846         if (unlikely(rx->sdata->ieee802_1x &&
 847                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 848                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 849                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
 850                      !ieee80211_is_eapol(rx->skb))) {
 851 #ifdef CONFIG_MAC80211_DEBUG
 852                 struct ieee80211_hdr *hdr =
 853                         (struct ieee80211_hdr *) rx->skb->data;
 854                 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
 855                        " (unauthorized port)\n", rx->dev->name,
 856                        MAC_ARG(hdr->addr2));
 857 #endif /* CONFIG_MAC80211_DEBUG */
 858                 return TXRX_DROP;
 859         }
 860
 861         return TXRX_CONTINUE;
 862 }
 863
 864 static ieee80211_txrx_result
 865 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
 866 {
 867         /*  If the device handles decryption totally, skip this test */
 868         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
 869                 return TXRX_CONTINUE;
 870
 871         /* Drop unencrypted frames if key is set. */
 872         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
 873                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 874                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 875                      (rx->key || rx->sdata->drop_unencrypted) &&
 876                      (rx->sdata->eapol == 0 ||
 877                       !ieee80211_is_eapol(rx->skb)))) {
 878                 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
 879                        "encryption\n", rx->dev->name);
 880                 return TXRX_DROP;
 881         }
 882         return TXRX_CONTINUE;
 883 }
 884
 885 static ieee80211_txrx_result
 886 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 887 {
 888         struct net_device *dev = rx->dev;
 889         struct ieee80211_local *local = rx->local;
 890         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 891         u16 fc, hdrlen, ethertype;
 892         u8 *payload;
 893         u8 dst[ETH_ALEN];
 894         u8 src[ETH_ALEN];
 895         struct sk_buff *skb = rx->skb, *skb2;
 896         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 897
 898         fc = rx->fc;
 899         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
 900                 return TXRX_CONTINUE;
 901
 902         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
 903                 return TXRX_DROP;
 904
 905         hdrlen = ieee80211_get_hdrlen(fc);
 906
 907         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 908          * header
 909          * IEEE 802.11 address fields:
 910          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 911          *   0     0   DA    SA    BSSID n/a
 912          *   0     1   DA    BSSID SA    n/a
 913          *   1     0   BSSID SA    DA    n/a
 914          *   1     1   RA    TA    DA    SA
 915          */
 916
 917         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 918         case IEEE80211_FCTL_TODS:
 919                 /* BSSID SA DA */
 920                 memcpy(dst, hdr->addr3, ETH_ALEN);
 921                 memcpy(src, hdr->addr2, ETH_ALEN);
 922
 923                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
 924                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
 925                         printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
 926                                MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
 927                                dev->name, MAC_ARG(hdr->addr1),
 928                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
 929                         return TXRX_DROP;
 930                 }
 931                 break;
 932         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 933                 /* RA TA DA SA */
 934                 memcpy(dst, hdr->addr3, ETH_ALEN);
 935                 memcpy(src, hdr->addr4, ETH_ALEN);
 936
 937                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
 938                         printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
 939                                MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
 940                                MAC_FMT ")\n",
 941                                rx->dev->name, MAC_ARG(hdr->addr1),
 942                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
 943                                MAC_ARG(hdr->addr4));
 944                         return TXRX_DROP;
 945                 }
 946                 break;
 947         case IEEE80211_FCTL_FROMDS:
 948                 /* DA BSSID SA */
 949                 memcpy(dst, hdr->addr1, ETH_ALEN);
 950                 memcpy(src, hdr->addr3, ETH_ALEN);
 951
 952                 if (sdata->type != IEEE80211_IF_TYPE_STA) {
 953                         return TXRX_DROP;
 954                 }
 955                 break;
 956         case 0:
 957                 /* DA SA BSSID */
 958                 memcpy(dst, hdr->addr1, ETH_ALEN);
 959                 memcpy(src, hdr->addr2, ETH_ALEN);
 960
 961                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
 962                         if (net_ratelimit()) {
 963                                 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
 964                                        MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
 965                                        ")\n",
 966                                        dev->name, MAC_ARG(hdr->addr1),
 967                                        MAC_ARG(hdr->addr2),
 968                                        MAC_ARG(hdr->addr3));
 969                         }
 970                         return TXRX_DROP;
 971                 }
 972                 break;
 973         }
 974
 975         payload = skb->data + hdrlen;
 976
 977         if (unlikely(skb->len - hdrlen < 8)) {
 978                 if (net_ratelimit()) {
 979                         printk(KERN_DEBUG "%s: RX too short data frame "
 980                                "payload\n", dev->name);
 981                 }
 982                 return TXRX_DROP;
 983         }
 984
 985         ethertype = (payload[6] << 8) | payload[7];
 986
 987         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 988                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 989                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 990                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 991                  * replace EtherType */
 992                 skb_pull(skb, hdrlen + 6);
 993                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 994                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 995         } else {
 996                 struct ethhdr *ehdr;
 997                 __be16 len;
 998                 skb_pull(skb, hdrlen);
 999                 len = htons(skb->len);
1000                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1001                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1002                 memcpy(ehdr->h_source, src, ETH_ALEN);
1003                 ehdr->h_proto = len;
1004         }
1005         skb->dev = dev;
1006
1007         skb2 = NULL;
1008
1009         sdata->stats.rx_packets++;
1010         sdata->stats.rx_bytes += skb->len;
1011
1012         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1013             || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
1014                 if (is_multicast_ether_addr(skb->data)) {
1015                         /* send multicast frames both to higher layers in
1016                          * local net stack and back to the wireless media */
1017                         skb2 = skb_copy(skb, GFP_ATOMIC);
1018                         if (!skb2)
1019                                 printk(KERN_DEBUG "%s: failed to clone "
1020                                        "multicast frame\n", dev->name);
1021                 } else {
1022                         struct sta_info *dsta;
1023                         dsta = sta_info_get(local, skb->data);
1024                         if (dsta && !dsta->dev) {
1025                                 printk(KERN_DEBUG "Station with null dev "
1026                                        "structure!\n");
1027                         } else if (dsta && dsta->dev == dev) {
1028                                 /* Destination station is associated to this
1029                                  * AP, so send the frame directly to it and
1030                                  * do not pass the frame to local net stack.
1031                                  */
1032                                 skb2 = skb;
1033                                 skb = NULL;
1034                         }
1035                         if (dsta)
1036                                 sta_info_put(dsta);
1037                 }
1038         }
1039
1040         if (skb) {
1041                 /* deliver to local stack */
1042                 skb->protocol = eth_type_trans(skb, dev);
1043                 memset(skb->cb, 0, sizeof(skb->cb));
1044                 netif_rx(skb);
1045         }
1046
1047         if (skb2) {
1048                 /* send to wireless media */
1049                 skb2->protocol = __constant_htons(ETH_P_802_3);
1050                 skb_set_network_header(skb2, 0);
1051                 skb_set_mac_header(skb2, 0);
1052                 dev_queue_xmit(skb2);
1053         }
1054
1055         return TXRX_QUEUED;
1056 }
1057
1058 static ieee80211_txrx_result
1059 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1060 {
1061         struct ieee80211_sub_if_data *sdata;
1062
1063         if (!rx->u.rx.ra_match)
1064                 return TXRX_DROP;
1065
1066         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1067         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1068              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1069             !rx->local->user_space_mlme) {
1070                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1071         } else {
1072                 /* Management frames are sent to hostapd for processing */
1073                 if (!rx->local->apdev)
1074                         return TXRX_DROP;
1075                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1076                                   ieee80211_msg_normal);
1077         }
1078         return TXRX_QUEUED;
1079 }
1080
1081 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1082                                 struct ieee80211_local *local,
1083                                 ieee80211_rx_handler *handlers,
1084                                 struct ieee80211_txrx_data *rx,
1085                                 struct sta_info *sta)
1086 {
1087         ieee80211_rx_handler *handler;
1088         ieee80211_txrx_result res = TXRX_DROP;
1089
1090         for (handler = handlers; *handler != NULL; handler++) {
1091                 res = (*handler)(rx);
1092
1093                 switch (res) {
1094                 case TXRX_CONTINUE:
1095                         continue;
1096                 case TXRX_DROP:
1097                         I802_DEBUG_INC(local->rx_handlers_drop);
1098                         if (sta)
1099                                 sta->rx_dropped++;
1100                         break;
1101                 case TXRX_QUEUED:
1102                         I802_DEBUG_INC(local->rx_handlers_queued);
1103                         break;
1104                 }
1105                 break;
1106         }
1107
1108         if (res == TXRX_DROP)
1109                 dev_kfree_skb(rx->skb);
1110         return res;
1111 }
1112
1113 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1114                                                 ieee80211_rx_handler *handlers,
1115                                                 struct ieee80211_txrx_data *rx,
1116                                                 struct sta_info *sta)
1117 {
1118         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1119             TXRX_CONTINUE)
1120                 dev_kfree_skb(rx->skb);
1121 }
1122
1123 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1124                                             struct ieee80211_hdr *hdr,
1125                                             struct sta_info *sta,
1126                                             struct ieee80211_txrx_data *rx)
1127 {
1128         int keyidx, hdrlen;
1129
1130         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1131         if (rx->skb->len >= hdrlen + 4)
1132                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1133         else
1134                 keyidx = -1;
1135
1136         /* TODO: verify that this is not triggered by fragmented
1137          * frames (hw does not verify MIC for them). */
1138         printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1139                "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1140                dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
1141
1142         if (!sta) {
1143                 /* Some hardware versions seem to generate incorrect
1144                  * Michael MIC reports; ignore them to avoid triggering
1145                  * countermeasures. */
1146                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1147                        "error for unknown address " MAC_FMT "\n",
1148                        dev->name, MAC_ARG(hdr->addr2));
1149                 goto ignore;
1150         }
1151
1152         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1153                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1154                        "error for a frame with no ISWEP flag (src "
1155                        MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1156                 goto ignore;
1157         }
1158
1159         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1160             rx->sdata->type == IEEE80211_IF_TYPE_AP) {
1161                 keyidx = ieee80211_wep_get_keyidx(rx->skb);
1162                 /* AP with Pairwise keys support should never receive Michael
1163                  * MIC errors for non-zero keyidx because these are reserved
1164                  * for group keys and only the AP is sending real multicast
1165                  * frames in BSS. */
1166                 if (keyidx) {
1167                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1168                                "a frame with non-zero keyidx (%d) (src " MAC_FMT
1169                                ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
1170                         goto ignore;
1171                 }
1172         }
1173
1174         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1175             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1176              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1177                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1178                        "error for a frame that cannot be encrypted "
1179                        "(fc=0x%04x) (src " MAC_FMT ")\n",
1180                        dev->name, rx->fc, MAC_ARG(hdr->addr2));
1181                 goto ignore;
1182         }
1183
1184         do {
1185                 union iwreq_data wrqu;
1186                 char *buf = kmalloc(128, GFP_ATOMIC);
1187                 if (!buf)
1188                         break;
1189
1190                 /* TODO: needed parameters: count, key type, TSC */
1191                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
1192                         "keyid=%d %scast addr=" MAC_FMT ")",
1193                         keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
1194                         MAC_ARG(hdr->addr2));
1195                 memset(&wrqu, 0, sizeof(wrqu));
1196                 wrqu.data.length = strlen(buf);
1197                 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
1198                 kfree(buf);
1199         } while (0);
1200
1201         /* TODO: consider verifying the MIC error report with software
1202          * implementation if we get too many spurious reports from the
1203          * hardware. */
1204         if (!rx->local->apdev)
1205                 goto ignore;
1206         ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1207                           ieee80211_msg_michael_mic_failure);
1208         return;
1209
1210  ignore:
1211         dev_kfree_skb(rx->skb);
1212         rx->skb = NULL;
1213 }
1214
1215 ieee80211_rx_handler ieee80211_rx_handlers[] =
1216 {
1217         ieee80211_rx_h_if_stats,
1218         ieee80211_rx_h_monitor,
1219         ieee80211_rx_h_passive_scan,
1220         ieee80211_rx_h_check,
1221         ieee80211_rx_h_load_key,
1222         ieee80211_rx_h_sta_process,
1223         ieee80211_rx_h_ccmp_decrypt,
1224         ieee80211_rx_h_tkip_decrypt,
1225         ieee80211_rx_h_wep_weak_iv_detection,
1226         ieee80211_rx_h_wep_decrypt,
1227         ieee80211_rx_h_defragment,
1228         ieee80211_rx_h_ps_poll,
1229         ieee80211_rx_h_michael_mic_verify,
1230         /* this must be after decryption - so header is counted in MPDU mic
1231          * must be before pae and data, so QOS_DATA format frames
1232          * are not passed to user space by these functions
1233          */
1234         ieee80211_rx_h_remove_qos_control,
1235         ieee80211_rx_h_802_1x_pae,
1236         ieee80211_rx_h_drop_unencrypted,
1237         ieee80211_rx_h_data,
1238         ieee80211_rx_h_mgmt,
1239         NULL
1240 };
1241
1242 /* main receive path */
1243
1244 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1245                                 u8 *bssid, struct ieee80211_txrx_data *rx,
1246                                 struct ieee80211_hdr *hdr)
1247 {
1248         int multicast = is_multicast_ether_addr(hdr->addr1);
1249
1250         switch (sdata->type) {
1251         case IEEE80211_IF_TYPE_STA:
1252                 if (!bssid)
1253                         return 0;
1254                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1255                         if (!rx->u.rx.in_scan)
1256                                 return 0;
1257                         rx->u.rx.ra_match = 0;
1258                 } else if (!multicast &&
1259                            compare_ether_addr(sdata->dev->dev_addr,
1260                                               hdr->addr1) != 0) {
1261                         if (!sdata->promisc)
1262                                 return 0;
1263                         rx->u.rx.ra_match = 0;
1264                 }
1265                 break;
1266         case IEEE80211_IF_TYPE_IBSS:
1267                 if (!bssid)
1268                         return 0;
1269                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1270                         if (!rx->u.rx.in_scan)
1271                                 return 0;
1272                         rx->u.rx.ra_match = 0;
1273                 } else if (!multicast &&
1274                            compare_ether_addr(sdata->dev->dev_addr,
1275                                               hdr->addr1) != 0) {
1276                         if (!sdata->promisc)
1277                                 return 0;
1278                         rx->u.rx.ra_match = 0;
1279                 } else if (!rx->sta)
1280                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1281                                                          bssid, hdr->addr2);
1282                 break;
1283         case IEEE80211_IF_TYPE_AP:
1284                 if (!bssid) {
1285                         if (compare_ether_addr(sdata->dev->dev_addr,
1286                                                hdr->addr1))
1287                                 return 0;
1288                 } else if (!ieee80211_bssid_match(bssid,
1289                                         sdata->dev->dev_addr)) {
1290                         if (!rx->u.rx.in_scan)
1291                                 return 0;
1292                         rx->u.rx.ra_match = 0;
1293                 }
1294                 if (sdata->dev == sdata->local->mdev && !rx->u.rx.in_scan)
1295                         /* do not receive anything via
1296                          * master device when not scanning */
1297                         return 0;
1298                 break;
1299         case IEEE80211_IF_TYPE_WDS:
1300                 if (bssid ||
1301                     (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1302                         return 0;
1303                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1304                         return 0;
1305                 break;
1306         }
1307
1308         return 1;
1309 }
1310
1311 /*
1312  * This is the receive path handler. It is called by a low level driver when an
1313  * 802.11 MPDU is received from the hardware.
1314  */
1315 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1316                     struct ieee80211_rx_status *status)
1317 {
1318         struct ieee80211_local *local = hw_to_local(hw);
1319         struct ieee80211_sub_if_data *sdata;
1320         struct sta_info *sta;
1321         struct ieee80211_hdr *hdr;
1322         struct ieee80211_txrx_data rx;
1323         u16 type;
1324         int radiotap_len = 0, prepres;
1325         struct ieee80211_sub_if_data *prev = NULL;
1326         struct sk_buff *skb_new;
1327         u8 *bssid;
1328
1329         if (status->flag & RX_FLAG_RADIOTAP) {
1330                 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1331                 skb_pull(skb, radiotap_len);
1332         }
1333
1334         hdr = (struct ieee80211_hdr *) skb->data;
1335         memset(&rx, 0, sizeof(rx));
1336         rx.skb = skb;
1337         rx.local = local;
1338
1339         rx.u.rx.status = status;
1340         rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1341         type = rx.fc & IEEE80211_FCTL_FTYPE;
1342         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1343                 local->dot11ReceivedFragmentCount++;
1344
1345         if (skb->len >= 16) {
1346                 sta = rx.sta = sta_info_get(local, hdr->addr2);
1347                 if (sta) {
1348                         rx.dev = rx.sta->dev;
1349                         rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1350                 }
1351         } else
1352                 sta = rx.sta = NULL;
1353
1354         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1355                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1356                 goto end;
1357         }
1358
1359         if (unlikely(local->sta_scanning))
1360                 rx.u.rx.in_scan = 1;
1361
1362         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1363                                            sta) != TXRX_CONTINUE)
1364                 goto end;
1365         skb = rx.skb;
1366
1367         skb_push(skb, radiotap_len);
1368         if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1369             !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1370                 rx.u.rx.ra_match = 1;
1371                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1372                                              rx.sta);
1373                 sta_info_put(sta);
1374                 return;
1375         }
1376
1377         bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1378
1379         read_lock(&local->sub_if_lock);
1380         list_for_each_entry(sdata, &local->sub_if_list, list) {
1381                 rx.u.rx.ra_match = 1;
1382
1383                 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1384                 /* prepare_for_handlers can change sta */
1385                 sta = rx.sta;
1386
1387                 if (!prepres)
1388                         continue;
1389
1390                 /*
1391                  * frame is destined for this interface, but if it's not
1392                  * also for the previous one we handle that after the
1393                  * loop to avoid copying the SKB once too much
1394                  */
1395
1396                 if (!prev) {
1397                         prev = sdata;
1398                         continue;
1399                 }
1400
1401                 /*
1402                  * frame was destined for the previous interface
1403                  * so invoke RX handlers for it
1404                  */
1405
1406                 skb_new = skb_copy(skb, GFP_ATOMIC);
1407                 if (!skb_new) {
1408                         if (net_ratelimit())
1409                                 printk(KERN_DEBUG "%s: failed to copy "
1410                                        "multicast frame for %s",
1411                                        local->mdev->name, prev->dev->name);
1412                         continue;
1413                 }
1414                 rx.skb = skb_new;
1415                 rx.dev = prev->dev;
1416                 rx.sdata = prev;
1417                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1418                                              &rx, sta);
1419                 prev = sdata;
1420         }
1421         if (prev) {
1422                 rx.skb = skb;
1423                 rx.dev = prev->dev;
1424                 rx.sdata = prev;
1425                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1426                                              &rx, sta);
1427         } else
1428                 dev_kfree_skb(skb);
1429         read_unlock(&local->sub_if_lock);
1430
1431  end:
1432         if (sta)
1433                 sta_info_put(sta);
1434 }
1435 EXPORT_SYMBOL(__ieee80211_rx);
1436
1437 /* This is a version of the rx handler that can be called from hard irq
1438  * context. Post the skb on the queue and schedule the tasklet */
1439 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1440                           struct ieee80211_rx_status *status)
1441 {
1442         struct ieee80211_local *local = hw_to_local(hw);
1443
1444         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1445
1446         skb->dev = local->mdev;
1447         /* copy status into skb->cb for use by tasklet */
1448         memcpy(skb->cb, status, sizeof(*status));
1449         skb->pkt_type = IEEE80211_RX_MSG;
1450         skb_queue_tail(&local->skb_queue, skb);
1451         tasklet_schedule(&local->tasklet);
1452 }
1453 EXPORT_SYMBOL(ieee80211_rx_irqsafe);