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/mac80211.h>
  17 #include <net/ieee80211_radiotap.h>
  18
  19 #include "ieee80211_i.h"
  20 #include "ieee80211_led.h"
  21 #include "ieee80211_common.h"
  22 #include "wep.h"
  23 #include "wpa.h"
  24 #include "tkip.h"
  25 #include "wme.h"
  26
  27 /* pre-rx handlers
  28  *
  29  * these don't have dev/sdata fields in the rx data
  30  * The sta value should also not be used because it may
  31  * be NULL even though a STA (in IBSS mode) will be added.
  32  */
  33
  34 static ieee80211_txrx_result
  35 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
  36 {
  37         u8 *data = rx->skb->data;
  38         int tid;
  39
  40         /* does the frame have a qos control field? */
  41         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
  42                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
  43                 /* frame has qos control */
  44                 tid = qc[0] & QOS_CONTROL_TID_MASK;
  45         } else {
  46                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
  47                         /* Separate TID for management frames */
  48                         tid = NUM_RX_DATA_QUEUES - 1;
  49                 } else {
  50                         /* no qos control present */
  51                         tid = 0; /* 802.1d - Best Effort */
  52                 }
  53         }
  54
  55         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
  56         /* only a debug counter, sta might not be assigned properly yet */
  57         if (rx->sta)
  58                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
  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         rx->u.rx.load = load;
 114
 115         return TXRX_CONTINUE;
 116 }
 117
 118 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 119 {
 120         ieee80211_rx_h_parse_qos,
 121         ieee80211_rx_h_load_stats,
 122         NULL
 123 };
 124
 125 /* rx handlers */
 126
 127 static ieee80211_txrx_result
 128 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
 129 {
 130         if (rx->sta)
 131                 rx->sta->channel_use_raw += rx->u.rx.load;
 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->flags & IEEE80211_TXRXD_RXIN_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->flags & IEEE80211_TXRXD_RXRA_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->flags & IEEE80211_TXRXD_RXRA_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->flags & IEEE80211_TXRXD_RXRA_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 keyidx;
 313         int hdrlen;
 314
 315         /*
 316          * Key selection 101
 317          *
 318          * There are three types of keys:
 319          *  - GTK (group keys)
 320          *  - PTK (pairwise keys)
 321          *  - STK (station-to-station pairwise keys)
 322          *
 323          * When selecting a key, we have to distinguish between multicast
 324          * (including broadcast) and unicast frames, the latter can only
 325          * use PTKs and STKs while the former always use GTKs. Unless, of
 326          * course, actual WEP keys ("pre-RSNA") are used, then unicast
 327          * frames can also use key indizes like GTKs. Hence, if we don't
 328          * have a PTK/STK we check the key index for a WEP key.
 329          *
 330          * There is also a slight problem in IBSS mode: GTKs are negotiated
 331          * with each station, that is something we don't currently handle.
 332          */
 333
 334         if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
 335                 return TXRX_CONTINUE;
 336
 337         /*
 338          * No point in finding a key if the frame is neither
 339          * addressed to us nor a multicast frame.
 340          */
 341         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 342                 return TXRX_CONTINUE;
 343
 344         if (!is_multicast_ether_addr(hdr->addr1) && rx->sta && rx->sta->key) {
 345                 rx->key = rx->sta->key;
 346         } else {
 347                 /*
 348                  * The device doesn't give us the IV so we won't be
 349                  * able to look up the key. That's ok though, we
 350                  * don't need to decrypt the frame, we just won't
 351                  * be able to keep statistics accurate.
 352                  * Except for key threshold notifications, should
 353                  * we somehow allow the driver to tell us which key
 354                  * the hardware used if this flag is set?
 355                  */
 356                 if (!(rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV))
 357                         return TXRX_CONTINUE;
 358
 359                 hdrlen = ieee80211_get_hdrlen(rx->fc);
 360
 361                 if (rx->skb->len < 8 + hdrlen)
 362                         return TXRX_DROP; /* TODO: count this? */
 363
 364                 /*
 365                  * no need to call ieee80211_wep_get_keyidx,
 366                  * it verifies a bunch of things we've done already
 367                  */
 368                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
 369
 370                 rx->key = rx->sdata->keys[keyidx];
 371
 372                 /*
 373                  * RSNA-protected unicast frames should always be sent with
 374                  * pairwise or station-to-station keys, but for WEP we allow
 375                  * using a key index as well.
 376                  */
 377                 if (rx->key && rx->key->alg != ALG_WEP &&
 378                     !is_multicast_ether_addr(hdr->addr1))
 379                         rx->key = NULL;
 380         }
 381
 382         if (rx->key) {
 383                 rx->key->tx_rx_count++;
 384                 if (unlikely(rx->local->key_tx_rx_threshold &&
 385                              rx->key->tx_rx_count >
 386                              rx->local->key_tx_rx_threshold)) {
 387                         ieee80211_key_threshold_notify(rx->dev, rx->key,
 388                                                        rx->sta);
 389                 }
 390         }
 391
 392         return TXRX_CONTINUE;
 393 }
 394
 395 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 396 {
 397         struct ieee80211_sub_if_data *sdata;
 398         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 399
 400         if (sdata->bss)
 401                 atomic_inc(&sdata->bss->num_sta_ps);
 402         sta->flags |= WLAN_STA_PS;
 403         sta->pspoll = 0;
 404 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 405         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
 406                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 407 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 408 }
 409
 410 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 411 {
 412         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 413         struct sk_buff *skb;
 414         int sent = 0;
 415         struct ieee80211_sub_if_data *sdata;
 416         struct ieee80211_tx_packet_data *pkt_data;
 417
 418         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 419         if (sdata->bss)
 420                 atomic_dec(&sdata->bss->num_sta_ps);
 421         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
 422         sta->pspoll = 0;
 423         if (!skb_queue_empty(&sta->ps_tx_buf)) {
 424                 if (local->ops->set_tim)
 425                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
 426                 if (sdata->bss)
 427                         bss_tim_clear(local, sdata->bss, sta->aid);
 428         }
 429 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 430         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
 431                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
 432 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 433         /* Send all buffered frames to the station */
 434         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 435                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 436                 sent++;
 437                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 438                 dev_queue_xmit(skb);
 439         }
 440         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 441                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 442                 local->total_ps_buffered--;
 443                 sent++;
 444 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 445                 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
 446                        "since STA not sleeping anymore\n", dev->name,
 447                        MAC_ARG(sta->addr), sta->aid);
 448 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 449                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 450                 dev_queue_xmit(skb);
 451         }
 452
 453         return sent;
 454 }
 455
 456 static ieee80211_txrx_result
 457 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 458 {
 459         struct sta_info *sta = rx->sta;
 460         struct net_device *dev = rx->dev;
 461         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 462
 463         if (!sta)
 464                 return TXRX_CONTINUE;
 465
 466         /* Update last_rx only for IBSS packets which are for the current
 467          * BSSID to avoid keeping the current IBSS network alive in cases where
 468          * other STAs are using different BSSID. */
 469         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
 470                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
 471                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 472                         sta->last_rx = jiffies;
 473         } else
 474         if (!is_multicast_ether_addr(hdr->addr1) ||
 475             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
 476                 /* Update last_rx only for unicast frames in order to prevent
 477                  * the Probe Request frames (the only broadcast frames from a
 478                  * STA in infrastructure mode) from keeping a connection alive.
 479                  */
 480                 sta->last_rx = jiffies;
 481         }
 482
 483         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 484                 return TXRX_CONTINUE;
 485
 486         sta->rx_fragments++;
 487         sta->rx_bytes += rx->skb->len;
 488         sta->last_rssi = (sta->last_rssi * 15 +
 489                           rx->u.rx.status->ssi) / 16;
 490         sta->last_signal = (sta->last_signal * 15 +
 491                             rx->u.rx.status->signal) / 16;
 492         sta->last_noise = (sta->last_noise * 15 +
 493                            rx->u.rx.status->noise) / 16;
 494
 495         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
 496                 /* Change STA power saving mode only in the end of a frame
 497                  * exchange sequence */
 498                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
 499                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
 500                 else if (!(sta->flags & WLAN_STA_PS) &&
 501                          (rx->fc & IEEE80211_FCTL_PM))
 502                         ap_sta_ps_start(dev, sta);
 503         }
 504
 505         /* Drop data::nullfunc frames silently, since they are used only to
 506          * control station power saving mode. */
 507         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 508             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
 509                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 510                 /* Update counter and free packet here to avoid counting this
 511                  * as a dropped packed. */
 512                 sta->rx_packets++;
 513                 dev_kfree_skb(rx->skb);
 514                 return TXRX_QUEUED;
 515         }
 516
 517         return TXRX_CONTINUE;
 518 } /* ieee80211_rx_h_sta_process */
 519
 520 static ieee80211_txrx_result
 521 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
 522 {
 523         if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 524             (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
 525             !rx->key || rx->key->alg != ALG_WEP ||
 526             !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 527                 return TXRX_CONTINUE;
 528
 529         /* Check for weak IVs, if hwaccel did not remove IV from the frame */
 530         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
 531             rx->key->force_sw_encrypt) {
 532                 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
 533                 if (iv) {
 534                         rx->sta->wep_weak_iv_count++;
 535                 }
 536         }
 537
 538         return TXRX_CONTINUE;
 539 }
 540
 541 static ieee80211_txrx_result
 542 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
 543 {
 544         if ((rx->key && rx->key->alg != ALG_WEP) ||
 545             !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
 546             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
 547              ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 548               (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
 549                 return TXRX_CONTINUE;
 550
 551         if (!rx->key) {
 552                 if (net_ratelimit())
 553                         printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
 554                                rx->dev->name);
 555                 return TXRX_DROP;
 556         }
 557
 558         if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
 559             rx->key->force_sw_encrypt) {
 560                 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
 561                         if (net_ratelimit())
 562                                 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
 563                                        "failed\n", rx->dev->name);
 564                         return TXRX_DROP;
 565                 }
 566         } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
 567                 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
 568                 /* remove ICV */
 569                 skb_trim(rx->skb, rx->skb->len - 4);
 570         }
 571
 572         return TXRX_CONTINUE;
 573 }
 574
 575 static inline struct ieee80211_fragment_entry *
 576 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 577                          unsigned int frag, unsigned int seq, int rx_queue,
 578                          struct sk_buff **skb)
 579 {
 580         struct ieee80211_fragment_entry *entry;
 581         int idx;
 582
 583         idx = sdata->fragment_next;
 584         entry = &sdata->fragments[sdata->fragment_next++];
 585         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 586                 sdata->fragment_next = 0;
 587
 588         if (!skb_queue_empty(&entry->skb_list)) {
 589 #ifdef CONFIG_MAC80211_DEBUG
 590                 struct ieee80211_hdr *hdr =
 591                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 592                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 593                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 594                        "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
 595                        sdata->dev->name, idx,
 596                        jiffies - entry->first_frag_time, entry->seq,
 597                        entry->last_frag, MAC_ARG(hdr->addr1),
 598                        MAC_ARG(hdr->addr2));
 599 #endif /* CONFIG_MAC80211_DEBUG */
 600                 __skb_queue_purge(&entry->skb_list);
 601         }
 602
 603         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 604         *skb = NULL;
 605         entry->first_frag_time = jiffies;
 606         entry->seq = seq;
 607         entry->rx_queue = rx_queue;
 608         entry->last_frag = frag;
 609         entry->ccmp = 0;
 610         entry->extra_len = 0;
 611
 612         return entry;
 613 }
 614
 615 static inline struct ieee80211_fragment_entry *
 616 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 617                           u16 fc, unsigned int frag, unsigned int seq,
 618                           int rx_queue, struct ieee80211_hdr *hdr)
 619 {
 620         struct ieee80211_fragment_entry *entry;
 621         int i, idx;
 622
 623         idx = sdata->fragment_next;
 624         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 625                 struct ieee80211_hdr *f_hdr;
 626                 u16 f_fc;
 627
 628                 idx--;
 629                 if (idx < 0)
 630                         idx = IEEE80211_FRAGMENT_MAX - 1;
 631
 632                 entry = &sdata->fragments[idx];
 633                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 634                     entry->rx_queue != rx_queue ||
 635                     entry->last_frag + 1 != frag)
 636                         continue;
 637
 638                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 639                 f_fc = le16_to_cpu(f_hdr->frame_control);
 640
 641                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 642                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 643                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 644                         continue;
 645
 646                 if (entry->first_frag_time + 2 * HZ < jiffies) {
 647                         __skb_queue_purge(&entry->skb_list);
 648                         continue;
 649                 }
 650                 return entry;
 651         }
 652
 653         return NULL;
 654 }
 655
 656 static ieee80211_txrx_result
 657 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 658 {
 659         struct ieee80211_hdr *hdr;
 660         u16 sc;
 661         unsigned int frag, seq;
 662         struct ieee80211_fragment_entry *entry;
 663         struct sk_buff *skb;
 664
 665         hdr = (struct ieee80211_hdr *) rx->skb->data;
 666         sc = le16_to_cpu(hdr->seq_ctrl);
 667         frag = sc & IEEE80211_SCTL_FRAG;
 668
 669         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 670                    (rx->skb)->len < 24 ||
 671                    is_multicast_ether_addr(hdr->addr1))) {
 672                 /* not fragmented */
 673                 goto out;
 674         }
 675         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 676
 677         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 678
 679         if (frag == 0) {
 680                 /* This is the first fragment of a new frame. */
 681                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 682                                                  rx->u.rx.queue, &(rx->skb));
 683                 if (rx->key && rx->key->alg == ALG_CCMP &&
 684                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 685                         /* Store CCMP PN so that we can verify that the next
 686                          * fragment has a sequential PN value. */
 687                         entry->ccmp = 1;
 688                         memcpy(entry->last_pn,
 689                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 690                                CCMP_PN_LEN);
 691                 }
 692                 return TXRX_QUEUED;
 693         }
 694
 695         /* This is a fragment for a frame that should already be pending in
 696          * fragment cache. Add this fragment to the end of the pending entry.
 697          */
 698         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 699                                           rx->u.rx.queue, hdr);
 700         if (!entry) {
 701                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 702                 return TXRX_DROP;
 703         }
 704
 705         /* Verify that MPDUs within one MSDU have sequential PN values.
 706          * (IEEE 802.11i, 8.3.3.4.5) */
 707         if (entry->ccmp) {
 708                 int i;
 709                 u8 pn[CCMP_PN_LEN], *rpn;
 710                 if (!rx->key || rx->key->alg != ALG_CCMP)
 711                         return TXRX_DROP;
 712                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 713                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 714                         pn[i]++;
 715                         if (pn[i])
 716                                 break;
 717                 }
 718                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
 719                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
 720                         if (net_ratelimit())
 721                                 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
 722                                        "sequential A2=" MAC_FMT
 723                                        " PN=%02x%02x%02x%02x%02x%02x "
 724                                        "(expected %02x%02x%02x%02x%02x%02x)\n",
 725                                        rx->dev->name, MAC_ARG(hdr->addr2),
 726                                        rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
 727                                        rpn[5], pn[0], pn[1], pn[2], pn[3],
 728                                        pn[4], pn[5]);
 729                         return TXRX_DROP;
 730                 }
 731                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 732         }
 733
 734         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 735         __skb_queue_tail(&entry->skb_list, rx->skb);
 736         entry->last_frag = frag;
 737         entry->extra_len += rx->skb->len;
 738         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 739                 rx->skb = NULL;
 740                 return TXRX_QUEUED;
 741         }
 742
 743         rx->skb = __skb_dequeue(&entry->skb_list);
 744         if (skb_tailroom(rx->skb) < entry->extra_len) {
 745                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 746                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 747                                               GFP_ATOMIC))) {
 748                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 749                         __skb_queue_purge(&entry->skb_list);
 750                         return TXRX_DROP;
 751                 }
 752         }
 753         while ((skb = __skb_dequeue(&entry->skb_list))) {
 754                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 755                 dev_kfree_skb(skb);
 756         }
 757
 758         /* Complete frame has been reassembled - process it now */
 759         rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
 760
 761  out:
 762         if (rx->sta)
 763                 rx->sta->rx_packets++;
 764         if (is_multicast_ether_addr(hdr->addr1))
 765                 rx->local->dot11MulticastReceivedFrameCount++;
 766         else
 767                 ieee80211_led_rx(rx->local);
 768         return TXRX_CONTINUE;
 769 }
 770
 771 static ieee80211_txrx_result
 772 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 773 {
 774         struct sk_buff *skb;
 775         int no_pending_pkts;
 776
 777         if (likely(!rx->sta ||
 778                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 779                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 780                    !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
 781                 return TXRX_CONTINUE;
 782
 783         skb = skb_dequeue(&rx->sta->tx_filtered);
 784         if (!skb) {
 785                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 786                 if (skb)
 787                         rx->local->total_ps_buffered--;
 788         }
 789         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 790                 skb_queue_empty(&rx->sta->ps_tx_buf);
 791
 792         if (skb) {
 793                 struct ieee80211_hdr *hdr =
 794                         (struct ieee80211_hdr *) skb->data;
 795
 796                 /* tell TX path to send one frame even though the STA may
 797                  * still remain is PS mode after this frame exchange */
 798                 rx->sta->pspoll = 1;
 799
 800 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 801                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
 802                        "after %d)\n",
 803                        MAC_ARG(rx->sta->addr), rx->sta->aid,
 804                        skb_queue_len(&rx->sta->ps_tx_buf));
 805 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 806
 807                 /* Use MoreData flag to indicate whether there are more
 808                  * buffered frames for this STA */
 809                 if (no_pending_pkts) {
 810                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 811                         rx->sta->flags &= ~WLAN_STA_TIM;
 812                 } else
 813                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 814
 815                 dev_queue_xmit(skb);
 816
 817                 if (no_pending_pkts) {
 818                         if (rx->local->ops->set_tim)
 819                                 rx->local->ops->set_tim(local_to_hw(rx->local),
 820                                                        rx->sta->aid, 0);
 821                         if (rx->sdata->bss)
 822                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
 823                 }
 824 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 825         } else if (!rx->u.rx.sent_ps_buffered) {
 826                 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
 827                        "though there is no buffered frames for it\n",
 828                        rx->dev->name, MAC_ARG(rx->sta->addr));
 829 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 830
 831         }
 832
 833         /* Free PS Poll skb here instead of returning TXRX_DROP that would
 834          * count as an dropped frame. */
 835         dev_kfree_skb(rx->skb);
 836
 837         return TXRX_QUEUED;
 838 }
 839
 840 static ieee80211_txrx_result
 841 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 842 {
 843         u16 fc = rx->fc;
 844         u8 *data = rx->skb->data;
 845         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 846
 847         if (!WLAN_FC_IS_QOS_DATA(fc))
 848                 return TXRX_CONTINUE;
 849
 850         /* remove the qos control field, update frame type and meta-data */
 851         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
 852         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
 853         /* change frame type to non QOS */
 854         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 855         hdr->frame_control = cpu_to_le16(fc);
 856
 857         return TXRX_CONTINUE;
 858 }
 859
 860 static ieee80211_txrx_result
 861 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
 862 {
 863         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
 864             rx->sdata->type != IEEE80211_IF_TYPE_STA &&
 865             (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
 866                 /* Pass both encrypted and unencrypted EAPOL frames to user
 867                  * space for processing. */
 868                 if (!rx->local->apdev)
 869                         return TXRX_DROP;
 870                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
 871                                   ieee80211_msg_normal);
 872                 return TXRX_QUEUED;
 873         }
 874
 875         if (unlikely(rx->sdata->ieee802_1x &&
 876                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 877                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 878                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
 879                      !ieee80211_is_eapol(rx->skb))) {
 880 #ifdef CONFIG_MAC80211_DEBUG
 881                 struct ieee80211_hdr *hdr =
 882                         (struct ieee80211_hdr *) rx->skb->data;
 883                 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
 884                        " (unauthorized port)\n", rx->dev->name,
 885                        MAC_ARG(hdr->addr2));
 886 #endif /* CONFIG_MAC80211_DEBUG */
 887                 return TXRX_DROP;
 888         }
 889
 890         return TXRX_CONTINUE;
 891 }
 892
 893 static ieee80211_txrx_result
 894 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
 895 {
 896         /*
 897          * Pass through unencrypted frames if the hardware might have
 898          * decrypted them already without telling us, but that can only
 899          * be true if we either didn't find a key or the found key is
 900          * uploaded to the hardware.
 901          */
 902         if ((rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) &&
 903             (!rx->key || !rx->key->force_sw_encrypt))
 904                 return TXRX_CONTINUE;
 905
 906         /* Drop unencrypted frames if key is set. */
 907         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
 908                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 909                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 910                      (rx->key || rx->sdata->drop_unencrypted) &&
 911                      (rx->sdata->eapol == 0 ||
 912                       !ieee80211_is_eapol(rx->skb)))) {
 913                 if (net_ratelimit())
 914                         printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
 915                                "encryption\n", rx->dev->name);
 916                 return TXRX_DROP;
 917         }
 918         return TXRX_CONTINUE;
 919 }
 920
 921 static ieee80211_txrx_result
 922 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 923 {
 924         struct net_device *dev = rx->dev;
 925         struct ieee80211_local *local = rx->local;
 926         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 927         u16 fc, hdrlen, ethertype;
 928         u8 *payload;
 929         u8 dst[ETH_ALEN];
 930         u8 src[ETH_ALEN];
 931         struct sk_buff *skb = rx->skb, *skb2;
 932         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 933
 934         fc = rx->fc;
 935         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
 936                 return TXRX_CONTINUE;
 937
 938         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
 939                 return TXRX_DROP;
 940
 941         hdrlen = ieee80211_get_hdrlen(fc);
 942
 943         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 944          * header
 945          * IEEE 802.11 address fields:
 946          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 947          *   0     0   DA    SA    BSSID n/a
 948          *   0     1   DA    BSSID SA    n/a
 949          *   1     0   BSSID SA    DA    n/a
 950          *   1     1   RA    TA    DA    SA
 951          */
 952
 953         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 954         case IEEE80211_FCTL_TODS:
 955                 /* BSSID SA DA */
 956                 memcpy(dst, hdr->addr3, ETH_ALEN);
 957                 memcpy(src, hdr->addr2, ETH_ALEN);
 958
 959                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
 960                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
 961                         if (net_ratelimit())
 962                                 printk(KERN_DEBUG "%s: dropped ToDS frame "
 963                                        "(BSSID=" MAC_FMT
 964                                        " SA=" MAC_FMT
 965                                        " DA=" MAC_FMT ")\n",
 966                                        dev->name,
 967                                        MAC_ARG(hdr->addr1),
 968                                        MAC_ARG(hdr->addr2),
 969                                        MAC_ARG(hdr->addr3));
 970                         return TXRX_DROP;
 971                 }
 972                 break;
 973         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 974                 /* RA TA DA SA */
 975                 memcpy(dst, hdr->addr3, ETH_ALEN);
 976                 memcpy(src, hdr->addr4, ETH_ALEN);
 977
 978                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
 979                         if (net_ratelimit())
 980                                 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
 981                                        "frame (RA=" MAC_FMT
 982                                        " TA=" MAC_FMT " DA=" MAC_FMT
 983                                        " SA=" MAC_FMT ")\n",
 984                                        rx->dev->name,
 985                                        MAC_ARG(hdr->addr1),
 986                                        MAC_ARG(hdr->addr2),
 987                                        MAC_ARG(hdr->addr3),
 988                                        MAC_ARG(hdr->addr4));
 989                         return TXRX_DROP;
 990                 }
 991                 break;
 992         case IEEE80211_FCTL_FROMDS:
 993                 /* DA BSSID SA */
 994                 memcpy(dst, hdr->addr1, ETH_ALEN);
 995                 memcpy(src, hdr->addr3, ETH_ALEN);
 996
 997                 if (sdata->type != IEEE80211_IF_TYPE_STA) {
 998                         return TXRX_DROP;
 999                 }
1000                 break;
1001         case 0:
1002                 /* DA SA BSSID */
1003                 memcpy(dst, hdr->addr1, ETH_ALEN);
1004                 memcpy(src, hdr->addr2, ETH_ALEN);
1005
1006                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1007                         if (net_ratelimit()) {
1008                                 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1009                                        MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1010                                        ")\n",
1011                                        dev->name, MAC_ARG(hdr->addr1),
1012                                        MAC_ARG(hdr->addr2),
1013                                        MAC_ARG(hdr->addr3));
1014                         }
1015                         return TXRX_DROP;
1016                 }
1017                 break;
1018         }
1019
1020         payload = skb->data + hdrlen;
1021
1022         if (unlikely(skb->len - hdrlen < 8)) {
1023                 if (net_ratelimit()) {
1024                         printk(KERN_DEBUG "%s: RX too short data frame "
1025                                "payload\n", dev->name);
1026                 }
1027                 return TXRX_DROP;
1028         }
1029
1030         ethertype = (payload[6] << 8) | payload[7];
1031
1032         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1033                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1034                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1035                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1036                  * replace EtherType */
1037                 skb_pull(skb, hdrlen + 6);
1038                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1039                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1040         } else {
1041                 struct ethhdr *ehdr;
1042                 __be16 len;
1043                 skb_pull(skb, hdrlen);
1044                 len = htons(skb->len);
1045                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1046                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1047                 memcpy(ehdr->h_source, src, ETH_ALEN);
1048                 ehdr->h_proto = len;
1049         }
1050         skb->dev = dev;
1051
1052         skb2 = NULL;
1053
1054         sdata->stats.rx_packets++;
1055         sdata->stats.rx_bytes += skb->len;
1056
1057         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1058             || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1059             (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1060                 if (is_multicast_ether_addr(skb->data)) {
1061                         /* send multicast frames both to higher layers in
1062                          * local net stack and back to the wireless media */
1063                         skb2 = skb_copy(skb, GFP_ATOMIC);
1064                         if (!skb2 && net_ratelimit())
1065                                 printk(KERN_DEBUG "%s: failed to clone "
1066                                        "multicast frame\n", dev->name);
1067                 } else {
1068                         struct sta_info *dsta;
1069                         dsta = sta_info_get(local, skb->data);
1070                         if (dsta && !dsta->dev) {
1071                                 if (net_ratelimit())
1072                                         printk(KERN_DEBUG "Station with null "
1073                                                "dev structure!\n");
1074                         } else if (dsta && dsta->dev == dev) {
1075                                 /* Destination station is associated to this
1076                                  * AP, so send the frame directly to it and
1077                                  * do not pass the frame to local net stack.
1078                                  */
1079                                 skb2 = skb;
1080                                 skb = NULL;
1081                         }
1082                         if (dsta)
1083                                 sta_info_put(dsta);
1084                 }
1085         }
1086
1087         if (skb) {
1088                 /* deliver to local stack */
1089                 skb->protocol = eth_type_trans(skb, dev);
1090                 memset(skb->cb, 0, sizeof(skb->cb));
1091                 netif_rx(skb);
1092         }
1093
1094         if (skb2) {
1095                 /* send to wireless media */
1096                 skb2->protocol = __constant_htons(ETH_P_802_3);
1097                 skb_set_network_header(skb2, 0);
1098                 skb_set_mac_header(skb2, 0);
1099                 dev_queue_xmit(skb2);
1100         }
1101
1102         return TXRX_QUEUED;
1103 }
1104
1105 static ieee80211_txrx_result
1106 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1107 {
1108         struct ieee80211_sub_if_data *sdata;
1109
1110         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1111                 return TXRX_DROP;
1112
1113         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1114         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1115              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1116             !rx->local->user_space_mlme) {
1117                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1118         } else {
1119                 /* Management frames are sent to hostapd for processing */
1120                 if (!rx->local->apdev)
1121                         return TXRX_DROP;
1122                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1123                                   ieee80211_msg_normal);
1124         }
1125         return TXRX_QUEUED;
1126 }
1127
1128 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1129                                 struct ieee80211_local *local,
1130                                 ieee80211_rx_handler *handlers,
1131                                 struct ieee80211_txrx_data *rx,
1132                                 struct sta_info *sta)
1133 {
1134         ieee80211_rx_handler *handler;
1135         ieee80211_txrx_result res = TXRX_DROP;
1136
1137         for (handler = handlers; *handler != NULL; handler++) {
1138                 res = (*handler)(rx);
1139
1140                 switch (res) {
1141                 case TXRX_CONTINUE:
1142                         continue;
1143                 case TXRX_DROP:
1144                         I802_DEBUG_INC(local->rx_handlers_drop);
1145                         if (sta)
1146                                 sta->rx_dropped++;
1147                         break;
1148                 case TXRX_QUEUED:
1149                         I802_DEBUG_INC(local->rx_handlers_queued);
1150                         break;
1151                 }
1152                 break;
1153         }
1154
1155         if (res == TXRX_DROP)
1156                 dev_kfree_skb(rx->skb);
1157         return res;
1158 }
1159
1160 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1161                                                 ieee80211_rx_handler *handlers,
1162                                                 struct ieee80211_txrx_data *rx,
1163                                                 struct sta_info *sta)
1164 {
1165         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1166             TXRX_CONTINUE)
1167                 dev_kfree_skb(rx->skb);
1168 }
1169
1170 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1171                                             struct ieee80211_hdr *hdr,
1172                                             struct sta_info *sta,
1173                                             struct ieee80211_txrx_data *rx)
1174 {
1175         int keyidx, hdrlen;
1176
1177         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1178         if (rx->skb->len >= hdrlen + 4)
1179                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1180         else
1181                 keyidx = -1;
1182
1183         /* TODO: verify that this is not triggered by fragmented
1184          * frames (hw does not verify MIC for them). */
1185         if (net_ratelimit())
1186                 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1187                        "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1188                        dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1189                        keyidx);
1190
1191         if (!sta) {
1192                 /* Some hardware versions seem to generate incorrect
1193                  * Michael MIC reports; ignore them to avoid triggering
1194                  * countermeasures. */
1195                 if (net_ratelimit())
1196                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1197                                "error for unknown address " MAC_FMT "\n",
1198                                dev->name, MAC_ARG(hdr->addr2));
1199                 goto ignore;
1200         }
1201
1202         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1203                 if (net_ratelimit())
1204                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1205                                "error for a frame with no ISWEP flag (src "
1206                                MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1207                 goto ignore;
1208         }
1209
1210         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1211             rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1212                 /* AP with Pairwise keys support should never receive Michael
1213                  * MIC errors for non-zero keyidx because these are reserved
1214                  * for group keys and only the AP is sending real multicast
1215                  * frames in BSS. */
1216                 if (net_ratelimit())
1217                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1218                                "a frame with non-zero keyidx (%d)"
1219                                " (src " MAC_FMT ")\n", dev->name, keyidx,
1220                                MAC_ARG(hdr->addr2));
1221                 goto ignore;
1222         }
1223
1224         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1225             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1226              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1227                 if (net_ratelimit())
1228                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1229                                "error for a frame that cannot be encrypted "
1230                                "(fc=0x%04x) (src " MAC_FMT ")\n",
1231                                dev->name, rx->fc, MAC_ARG(hdr->addr2));
1232                 goto ignore;
1233         }
1234
1235         /* TODO: consider verifying the MIC error report with software
1236          * implementation if we get too many spurious reports from the
1237          * hardware. */
1238
1239         mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1240  ignore:
1241         dev_kfree_skb(rx->skb);
1242         rx->skb = NULL;
1243 }
1244
1245 ieee80211_rx_handler ieee80211_rx_handlers[] =
1246 {
1247         ieee80211_rx_h_if_stats,
1248         ieee80211_rx_h_monitor,
1249         ieee80211_rx_h_passive_scan,
1250         ieee80211_rx_h_check,
1251         ieee80211_rx_h_load_key,
1252         ieee80211_rx_h_sta_process,
1253         ieee80211_rx_h_ccmp_decrypt,
1254         ieee80211_rx_h_tkip_decrypt,
1255         ieee80211_rx_h_wep_weak_iv_detection,
1256         ieee80211_rx_h_wep_decrypt,
1257         ieee80211_rx_h_defragment,
1258         ieee80211_rx_h_ps_poll,
1259         ieee80211_rx_h_michael_mic_verify,
1260         /* this must be after decryption - so header is counted in MPDU mic
1261          * must be before pae and data, so QOS_DATA format frames
1262          * are not passed to user space by these functions
1263          */
1264         ieee80211_rx_h_remove_qos_control,
1265         ieee80211_rx_h_802_1x_pae,
1266         ieee80211_rx_h_drop_unencrypted,
1267         ieee80211_rx_h_data,
1268         ieee80211_rx_h_mgmt,
1269         NULL
1270 };
1271
1272 /* main receive path */
1273
1274 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1275                                 u8 *bssid, struct ieee80211_txrx_data *rx,
1276                                 struct ieee80211_hdr *hdr)
1277 {
1278         int multicast = is_multicast_ether_addr(hdr->addr1);
1279
1280         switch (sdata->type) {
1281         case IEEE80211_IF_TYPE_STA:
1282                 if (!bssid)
1283                         return 0;
1284                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1285                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1286                                 return 0;
1287                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1288                 } else if (!multicast &&
1289                            compare_ether_addr(sdata->dev->dev_addr,
1290                                               hdr->addr1) != 0) {
1291                         if (!sdata->promisc)
1292                                 return 0;
1293                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1294                 }
1295                 break;
1296         case IEEE80211_IF_TYPE_IBSS:
1297                 if (!bssid)
1298                         return 0;
1299                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1300                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1301                                 return 0;
1302                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1303                 } else if (!multicast &&
1304                            compare_ether_addr(sdata->dev->dev_addr,
1305                                               hdr->addr1) != 0) {
1306                         if (!sdata->promisc)
1307                                 return 0;
1308                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1309                 } else if (!rx->sta)
1310                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1311                                                          bssid, hdr->addr2);
1312                 break;
1313         case IEEE80211_IF_TYPE_AP:
1314                 if (!bssid) {
1315                         if (compare_ether_addr(sdata->dev->dev_addr,
1316                                                hdr->addr1))
1317                                 return 0;
1318                 } else if (!ieee80211_bssid_match(bssid,
1319                                         sdata->dev->dev_addr)) {
1320                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1321                                 return 0;
1322                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1323                 }
1324                 if (sdata->dev == sdata->local->mdev &&
1325                     !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1326                         /* do not receive anything via
1327                          * master device when not scanning */
1328                         return 0;
1329                 break;
1330         case IEEE80211_IF_TYPE_WDS:
1331                 if (bssid ||
1332                     (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1333                         return 0;
1334                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1335                         return 0;
1336                 break;
1337         }
1338
1339         return 1;
1340 }
1341
1342 /*
1343  * This is the receive path handler. It is called by a low level driver when an
1344  * 802.11 MPDU is received from the hardware.
1345  */
1346 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1347                     struct ieee80211_rx_status *status)
1348 {
1349         struct ieee80211_local *local = hw_to_local(hw);
1350         struct ieee80211_sub_if_data *sdata;
1351         struct sta_info *sta;
1352         struct ieee80211_hdr *hdr;
1353         struct ieee80211_txrx_data rx;
1354         u16 type;
1355         int radiotap_len = 0, prepres;
1356         struct ieee80211_sub_if_data *prev = NULL;
1357         struct sk_buff *skb_new;
1358         u8 *bssid;
1359
1360         if (status->flag & RX_FLAG_RADIOTAP) {
1361                 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1362                 skb_pull(skb, radiotap_len);
1363         }
1364
1365         hdr = (struct ieee80211_hdr *) skb->data;
1366         memset(&rx, 0, sizeof(rx));
1367         rx.skb = skb;
1368         rx.local = local;
1369
1370         rx.u.rx.status = status;
1371         rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1372         type = rx.fc & IEEE80211_FCTL_FTYPE;
1373         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1374                 local->dot11ReceivedFragmentCount++;
1375
1376         if (skb->len >= 16) {
1377                 sta = rx.sta = sta_info_get(local, hdr->addr2);
1378                 if (sta) {
1379                         rx.dev = rx.sta->dev;
1380                         rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1381                 }
1382         } else
1383                 sta = rx.sta = NULL;
1384
1385         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1386                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1387                 goto end;
1388         }
1389
1390         if (unlikely(local->sta_scanning))
1391                 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1392
1393         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1394                                            sta) != TXRX_CONTINUE)
1395                 goto end;
1396         skb = rx.skb;
1397
1398         skb_push(skb, radiotap_len);
1399         if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1400             !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1401                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1402                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1403                                              rx.sta);
1404                 sta_info_put(sta);
1405                 return;
1406         }
1407
1408         bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1409
1410         read_lock(&local->sub_if_lock);
1411         list_for_each_entry(sdata, &local->sub_if_list, list) {
1412                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1413
1414                 if (!netif_running(sdata->dev))
1415                         continue;
1416
1417                 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1418                 /* prepare_for_handlers can change sta */
1419                 sta = rx.sta;
1420
1421                 if (!prepres)
1422                         continue;
1423
1424                 /*
1425                  * frame is destined for this interface, but if it's not
1426                  * also for the previous one we handle that after the
1427                  * loop to avoid copying the SKB once too much
1428                  */
1429
1430                 if (!prev) {
1431                         prev = sdata;
1432                         continue;
1433                 }
1434
1435                 /*
1436                  * frame was destined for the previous interface
1437                  * so invoke RX handlers for it
1438                  */
1439
1440                 skb_new = skb_copy(skb, GFP_ATOMIC);
1441                 if (!skb_new) {
1442                         if (net_ratelimit())
1443                                 printk(KERN_DEBUG "%s: failed to copy "
1444                                        "multicast frame for %s",
1445                                        local->mdev->name, prev->dev->name);
1446                         continue;
1447                 }
1448                 rx.skb = skb_new;
1449                 rx.dev = prev->dev;
1450                 rx.sdata = prev;
1451                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1452                                              &rx, sta);
1453                 prev = sdata;
1454         }
1455         if (prev) {
1456                 rx.skb = skb;
1457                 rx.dev = prev->dev;
1458                 rx.sdata = prev;
1459                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1460                                              &rx, sta);
1461         } else
1462                 dev_kfree_skb(skb);
1463         read_unlock(&local->sub_if_lock);
1464
1465  end:
1466         if (sta)
1467                 sta_info_put(sta);
1468 }
1469 EXPORT_SYMBOL(__ieee80211_rx);
1470
1471 /* This is a version of the rx handler that can be called from hard irq
1472  * context. Post the skb on the queue and schedule the tasklet */
1473 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1474                           struct ieee80211_rx_status *status)
1475 {
1476         struct ieee80211_local *local = hw_to_local(hw);
1477
1478         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1479
1480         skb->dev = local->mdev;
1481         /* copy status into skb->cb for use by tasklet */
1482         memcpy(skb->cb, status, sizeof(*status));
1483         skb->pkt_type = IEEE80211_RX_MSG;
1484         skb_queue_tail(&local->skb_queue, skb);
1485         tasklet_schedule(&local->tasklet);
1486 }
1487 EXPORT_SYMBOL(ieee80211_rx_irqsafe);