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 <linux/rcupdate.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 "wep.h"
  23 #include "wpa.h"
  24 #include "tkip.h"
  25 #include "wme.h"
  26
  27 /*
  28  * monitor mode reception
  29  *
  30  * This function cleans up the SKB, i.e. it removes all the stuff
  31  * only useful for monitoring.
  32  */
  33 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  34                                            struct sk_buff *skb,
  35                                            int rtap_len)
  36 {
  37         skb_pull(skb, rtap_len);
  38
  39         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  40                 if (likely(skb->len > FCS_LEN))
  41                         skb_trim(skb, skb->len - FCS_LEN);
  42                 else {
  43                         /* driver bug */
  44                         WARN_ON(1);
  45                         dev_kfree_skb(skb);
  46                         skb = NULL;
  47                 }
  48         }
  49
  50         return skb;
  51 }
  52
  53 static inline int should_drop_frame(struct ieee80211_rx_status *status,
  54                                     struct sk_buff *skb,
  55                                     int present_fcs_len,
  56                                     int radiotap_len)
  57 {
  58         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  59
  60         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
  61                 return 1;
  62         if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
  63                 return 1;
  64         if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
  65                         cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
  66             ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
  67                         cpu_to_le16(IEEE80211_STYPE_PSPOLL)))
  68                 return 1;
  69         return 0;
  70 }
  71
  72 /*
  73  * This function copies a received frame to all monitor interfaces and
  74  * returns a cleaned-up SKB that no longer includes the FCS nor the
  75  * radiotap header the driver might have added.
  76  */
  77 static struct sk_buff *
  78 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
  79                      struct ieee80211_rx_status *status)
  80 {
  81         struct ieee80211_sub_if_data *sdata;
  82         struct ieee80211_rate *rate;
  83         int needed_headroom = 0;
  84         struct ieee80211_radiotap_header *rthdr;
  85         __le64 *rttsft = NULL;
  86         struct ieee80211_rtap_fixed_data {
  87                 u8 flags;
  88                 u8 rate;
  89                 __le16 chan_freq;
  90                 __le16 chan_flags;
  91                 u8 antsignal;
  92                 u8 padding_for_rxflags;
  93                 __le16 rx_flags;
  94         } __attribute__ ((packed)) *rtfixed;
  95         struct sk_buff *skb, *skb2;
  96         struct net_device *prev_dev = NULL;
  97         int present_fcs_len = 0;
  98         int rtap_len = 0;
  99
 100         /*
 101          * First, we may need to make a copy of the skb because
 102          *  (1) we need to modify it for radiotap (if not present), and
 103          *  (2) the other RX handlers will modify the skb we got.
 104          *
 105          * We don't need to, of course, if we aren't going to return
 106          * the SKB because it has a bad FCS/PLCP checksum.
 107          */
 108         if (status->flag & RX_FLAG_RADIOTAP)
 109                 rtap_len = ieee80211_get_radiotap_len(origskb->data);
 110         else
 111                 /* room for radiotap header, always present fields and TSFT */
 112                 needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
 113
 114         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 115                 present_fcs_len = FCS_LEN;
 116
 117         if (!local->monitors) {
 118                 if (should_drop_frame(status, origskb, present_fcs_len,
 119                                       rtap_len)) {
 120                         dev_kfree_skb(origskb);
 121                         return NULL;
 122                 }
 123
 124                 return remove_monitor_info(local, origskb, rtap_len);
 125         }
 126
 127         if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
 128                 /* only need to expand headroom if necessary */
 129                 skb = origskb;
 130                 origskb = NULL;
 131
 132                 /*
 133                  * This shouldn't trigger often because most devices have an
 134                  * RX header they pull before we get here, and that should
 135                  * be big enough for our radiotap information. We should
 136                  * probably export the length to drivers so that we can have
 137                  * them allocate enough headroom to start with.
 138                  */
 139                 if (skb_headroom(skb) < needed_headroom &&
 140                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 141                         dev_kfree_skb(skb);
 142                         return NULL;
 143                 }
 144         } else {
 145                 /*
 146                  * Need to make a copy and possibly remove radiotap header
 147                  * and FCS from the original.
 148                  */
 149                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 150
 151                 origskb = remove_monitor_info(local, origskb, rtap_len);
 152
 153                 if (!skb)
 154                         return origskb;
 155         }
 156
 157         /* if necessary, prepend radiotap information */
 158         if (!(status->flag & RX_FLAG_RADIOTAP)) {
 159                 rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
 160                 rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
 161                 if (status->flag & RX_FLAG_TSFT) {
 162                         rttsft = (void *) skb_push(skb, sizeof(*rttsft));
 163                         rtap_len += 8;
 164                 }
 165                 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
 166                 memset(rthdr, 0, sizeof(*rthdr));
 167                 memset(rtfixed, 0, sizeof(*rtfixed));
 168                 rthdr->it_present =
 169                         cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 170                                     (1 << IEEE80211_RADIOTAP_RATE) |
 171                                     (1 << IEEE80211_RADIOTAP_CHANNEL) |
 172                                     (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
 173                                     (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 174                 rtfixed->flags = 0;
 175                 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 176                         rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
 177
 178                 if (rttsft) {
 179                         *rttsft = cpu_to_le64(status->mactime);
 180                         rthdr->it_present |=
 181                                 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 182                 }
 183
 184                 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
 185                 rtfixed->rx_flags = 0;
 186                 if (status->flag &
 187                     (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 188                         rtfixed->rx_flags |=
 189                                 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
 190
 191                 rate = ieee80211_get_rate(local, status->phymode,
 192                                           status->rate);
 193                 if (rate)
 194                         rtfixed->rate = rate->rate / 5;
 195
 196                 rtfixed->chan_freq = cpu_to_le16(status->freq);
 197
 198                 if (status->phymode == MODE_IEEE80211A)
 199                         rtfixed->chan_flags =
 200                                 cpu_to_le16(IEEE80211_CHAN_OFDM |
 201                                             IEEE80211_CHAN_5GHZ);
 202                 else
 203                         rtfixed->chan_flags =
 204                                 cpu_to_le16(IEEE80211_CHAN_DYN |
 205                                             IEEE80211_CHAN_2GHZ);
 206
 207                 rtfixed->antsignal = status->ssi;
 208                 rthdr->it_len = cpu_to_le16(rtap_len);
 209         }
 210
 211         skb_reset_mac_header(skb);
 212         skb->ip_summed = CHECKSUM_UNNECESSARY;
 213         skb->pkt_type = PACKET_OTHERHOST;
 214         skb->protocol = htons(ETH_P_802_2);
 215
 216         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 217                 if (!netif_running(sdata->dev))
 218                         continue;
 219
 220                 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
 221                         continue;
 222
 223                 if (prev_dev) {
 224                         skb2 = skb_clone(skb, GFP_ATOMIC);
 225                         if (skb2) {
 226                                 skb2->dev = prev_dev;
 227                                 netif_rx(skb2);
 228                         }
 229                 }
 230
 231                 prev_dev = sdata->dev;
 232                 sdata->dev->stats.rx_packets++;
 233                 sdata->dev->stats.rx_bytes += skb->len;
 234         }
 235
 236         if (prev_dev) {
 237                 skb->dev = prev_dev;
 238                 netif_rx(skb);
 239         } else
 240                 dev_kfree_skb(skb);
 241
 242         return origskb;
 243 }
 244
 245
 246 /* pre-rx handlers
 247  *
 248  * these don't have dev/sdata fields in the rx data
 249  * The sta value should also not be used because it may
 250  * be NULL even though a STA (in IBSS mode) will be added.
 251  */
 252
 253 static ieee80211_txrx_result
 254 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
 255 {
 256         u8 *data = rx->skb->data;
 257         int tid;
 258
 259         /* does the frame have a qos control field? */
 260         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
 261                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
 262                 /* frame has qos control */
 263                 tid = qc[0] & QOS_CONTROL_TID_MASK;
 264                 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
 265                         rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
 266                 else
 267                         rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
 268         } else {
 269                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
 270                         /* Separate TID for management frames */
 271                         tid = NUM_RX_DATA_QUEUES - 1;
 272                 } else {
 273                         /* no qos control present */
 274                         tid = 0; /* 802.1d - Best Effort */
 275                 }
 276         }
 277
 278         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
 279         /* only a debug counter, sta might not be assigned properly yet */
 280         if (rx->sta)
 281                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
 282
 283         rx->u.rx.queue = tid;
 284         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 285          * For now, set skb->priority to 0 for other cases. */
 286         rx->skb->priority = (tid > 7) ? 0 : tid;
 287
 288         return TXRX_CONTINUE;
 289 }
 290
 291
 292 u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
 293                               struct sk_buff *skb,
 294                               struct ieee80211_rx_status *status)
 295 {
 296         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 297         u32 load = 0, hdrtime;
 298         struct ieee80211_rate *rate;
 299         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
 300         int i;
 301
 302         /* Estimate total channel use caused by this frame */
 303
 304         if (unlikely(mode->num_rates < 0))
 305                 return TXRX_CONTINUE;
 306
 307         rate = &mode->rates[0];
 308         for (i = 0; i < mode->num_rates; i++) {
 309                 if (mode->rates[i].val == status->rate) {
 310                         rate = &mode->rates[i];
 311                         break;
 312                 }
 313         }
 314
 315         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
 316          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
 317
 318         if (mode->mode == MODE_IEEE80211A ||
 319             (mode->mode == MODE_IEEE80211G &&
 320              rate->flags & IEEE80211_RATE_ERP))
 321                 hdrtime = CHAN_UTIL_HDR_SHORT;
 322         else
 323                 hdrtime = CHAN_UTIL_HDR_LONG;
 324
 325         load = hdrtime;
 326         if (!is_multicast_ether_addr(hdr->addr1))
 327                 load += hdrtime;
 328
 329         load += skb->len * rate->rate_inv;
 330
 331         /* Divide channel_use by 8 to avoid wrapping around the counter */
 332         load >>= CHAN_UTIL_SHIFT;
 333         local->channel_use_raw += load;
 334
 335         return load;
 336 }
 337
 338 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 339 {
 340         ieee80211_rx_h_parse_qos,
 341         NULL
 342 };
 343
 344 /* rx handlers */
 345
 346 static ieee80211_txrx_result
 347 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
 348 {
 349         if (rx->sta)
 350                 rx->sta->channel_use_raw += rx->u.rx.load;
 351         rx->sdata->channel_use_raw += rx->u.rx.load;
 352         return TXRX_CONTINUE;
 353 }
 354
 355 static ieee80211_txrx_result
 356 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
 357 {
 358         struct ieee80211_local *local = rx->local;
 359         struct sk_buff *skb = rx->skb;
 360
 361         if (unlikely(local->sta_hw_scanning))
 362                 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
 363
 364         if (unlikely(local->sta_sw_scanning)) {
 365                 /* drop all the other packets during a software scan anyway */
 366                 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
 367                     != TXRX_QUEUED)
 368                         dev_kfree_skb(skb);
 369                 return TXRX_QUEUED;
 370         }
 371
 372         if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
 373                 /* scanning finished during invoking of handlers */
 374                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 375                 return TXRX_DROP;
 376         }
 377
 378         return TXRX_CONTINUE;
 379 }
 380
 381 static ieee80211_txrx_result
 382 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 383 {
 384         struct ieee80211_hdr *hdr;
 385         hdr = (struct ieee80211_hdr *) rx->skb->data;
 386
 387         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 388         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 389                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
 390                              rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
 391                              hdr->seq_ctrl)) {
 392                         if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
 393                                 rx->local->dot11FrameDuplicateCount++;
 394                                 rx->sta->num_duplicates++;
 395                         }
 396                         return TXRX_DROP;
 397                 } else
 398                         rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
 399         }
 400
 401         if (unlikely(rx->skb->len < 16)) {
 402                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 403                 return TXRX_DROP;
 404         }
 405
 406         /* Drop disallowed frame classes based on STA auth/assoc state;
 407          * IEEE 802.11, Chap 5.5.
 408          *
 409          * 80211.o does filtering only based on association state, i.e., it
 410          * drops Class 3 frames from not associated stations. hostapd sends
 411          * deauth/disassoc frames when needed. In addition, hostapd is
 412          * responsible for filtering on both auth and assoc states.
 413          */
 414         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
 415                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
 416                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
 417                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 418                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
 419                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
 420                      !(rx->fc & IEEE80211_FCTL_TODS) &&
 421                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
 422                     || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
 423                         /* Drop IBSS frames and frames for other hosts
 424                          * silently. */
 425                         return TXRX_DROP;
 426                 }
 427
 428                 return TXRX_DROP;
 429         }
 430
 431         return TXRX_CONTINUE;
 432 }
 433
 434
 435 static ieee80211_txrx_result
 436 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 437 {
 438         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 439         int keyidx;
 440         int hdrlen;
 441         ieee80211_txrx_result result = TXRX_DROP;
 442         struct ieee80211_key *stakey = NULL;
 443
 444         /*
 445          * Key selection 101
 446          *
 447          * There are three types of keys:
 448          *  - GTK (group keys)
 449          *  - PTK (pairwise keys)
 450          *  - STK (station-to-station pairwise keys)
 451          *
 452          * When selecting a key, we have to distinguish between multicast
 453          * (including broadcast) and unicast frames, the latter can only
 454          * use PTKs and STKs while the former always use GTKs. Unless, of
 455          * course, actual WEP keys ("pre-RSNA") are used, then unicast
 456          * frames can also use key indizes like GTKs. Hence, if we don't
 457          * have a PTK/STK we check the key index for a WEP key.
 458          *
 459          * Note that in a regular BSS, multicast frames are sent by the
 460          * AP only, associated stations unicast the frame to the AP first
 461          * which then multicasts it on their behalf.
 462          *
 463          * There is also a slight problem in IBSS mode: GTKs are negotiated
 464          * with each station, that is something we don't currently handle.
 465          * The spec seems to expect that one negotiates the same key with
 466          * every station but there's no such requirement; VLANs could be
 467          * possible.
 468          */
 469
 470         if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
 471                 return TXRX_CONTINUE;
 472
 473         /*
 474          * No point in finding a key and decrypting if the frame is neither
 475          * addressed to us nor a multicast frame.
 476          */
 477         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 478                 return TXRX_CONTINUE;
 479
 480         if (rx->sta)
 481                 stakey = rcu_dereference(rx->sta->key);
 482
 483         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
 484                 rx->key = stakey;
 485         } else {
 486                 /*
 487                  * The device doesn't give us the IV so we won't be
 488                  * able to look up the key. That's ok though, we
 489                  * don't need to decrypt the frame, we just won't
 490                  * be able to keep statistics accurate.
 491                  * Except for key threshold notifications, should
 492                  * we somehow allow the driver to tell us which key
 493                  * the hardware used if this flag is set?
 494                  */
 495                 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
 496                     (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
 497                         return TXRX_CONTINUE;
 498
 499                 hdrlen = ieee80211_get_hdrlen(rx->fc);
 500
 501                 if (rx->skb->len < 8 + hdrlen)
 502                         return TXRX_DROP; /* TODO: count this? */
 503
 504                 /*
 505                  * no need to call ieee80211_wep_get_keyidx,
 506                  * it verifies a bunch of things we've done already
 507                  */
 508                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
 509
 510                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
 511
 512                 /*
 513                  * RSNA-protected unicast frames should always be sent with
 514                  * pairwise or station-to-station keys, but for WEP we allow
 515                  * using a key index as well.
 516                  */
 517                 if (rx->key && rx->key->conf.alg != ALG_WEP &&
 518                     !is_multicast_ether_addr(hdr->addr1))
 519                         rx->key = NULL;
 520         }
 521
 522         if (rx->key) {
 523                 rx->key->tx_rx_count++;
 524                 /* TODO: add threshold stuff again */
 525         } else {
 526 #ifdef CONFIG_MAC80211_DEBUG
 527                 if (net_ratelimit())
 528                         printk(KERN_DEBUG "%s: RX protected frame,"
 529                                " but have no key\n", rx->dev->name);
 530 #endif /* CONFIG_MAC80211_DEBUG */
 531                 return TXRX_DROP;
 532         }
 533
 534         /* Check for weak IVs if possible */
 535         if (rx->sta && rx->key->conf.alg == ALG_WEP &&
 536             ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
 537             (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
 538              !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
 539             ieee80211_wep_is_weak_iv(rx->skb, rx->key))
 540                 rx->sta->wep_weak_iv_count++;
 541
 542         switch (rx->key->conf.alg) {
 543         case ALG_WEP:
 544                 result = ieee80211_crypto_wep_decrypt(rx);
 545                 break;
 546         case ALG_TKIP:
 547                 result = ieee80211_crypto_tkip_decrypt(rx);
 548                 break;
 549         case ALG_CCMP:
 550                 result = ieee80211_crypto_ccmp_decrypt(rx);
 551                 break;
 552         }
 553
 554         /* either the frame has been decrypted or will be dropped */
 555         rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
 556
 557         return result;
 558 }
 559
 560 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 561 {
 562         struct ieee80211_sub_if_data *sdata;
 563         DECLARE_MAC_BUF(mac);
 564
 565         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 566
 567         if (sdata->bss)
 568                 atomic_inc(&sdata->bss->num_sta_ps);
 569         sta->flags |= WLAN_STA_PS;
 570         sta->pspoll = 0;
 571 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 572         printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
 573                dev->name, print_mac(mac, sta->addr), sta->aid);
 574 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 575 }
 576
 577 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 578 {
 579         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 580         struct sk_buff *skb;
 581         int sent = 0;
 582         struct ieee80211_sub_if_data *sdata;
 583         struct ieee80211_tx_packet_data *pkt_data;
 584         DECLARE_MAC_BUF(mac);
 585
 586         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 587         if (sdata->bss)
 588                 atomic_dec(&sdata->bss->num_sta_ps);
 589         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
 590         sta->pspoll = 0;
 591         if (!skb_queue_empty(&sta->ps_tx_buf)) {
 592                 if (local->ops->set_tim)
 593                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
 594                 if (sdata->bss)
 595                         bss_tim_clear(local, sdata->bss, sta->aid);
 596         }
 597 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 598         printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
 599                dev->name, print_mac(mac, sta->addr), sta->aid);
 600 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 601         /* Send all buffered frames to the station */
 602         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 603                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 604                 sent++;
 605                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 606                 dev_queue_xmit(skb);
 607         }
 608         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 609                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 610                 local->total_ps_buffered--;
 611                 sent++;
 612 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 613                 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
 614                        "since STA not sleeping anymore\n", dev->name,
 615                        print_mac(mac, sta->addr), sta->aid);
 616 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 617                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 618                 dev_queue_xmit(skb);
 619         }
 620
 621         return sent;
 622 }
 623
 624 static ieee80211_txrx_result
 625 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 626 {
 627         struct sta_info *sta = rx->sta;
 628         struct net_device *dev = rx->dev;
 629         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 630
 631         if (!sta)
 632                 return TXRX_CONTINUE;
 633
 634         /* Update last_rx only for IBSS packets which are for the current
 635          * BSSID to avoid keeping the current IBSS network alive in cases where
 636          * other STAs are using different BSSID. */
 637         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
 638                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
 639                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 640                         sta->last_rx = jiffies;
 641         } else
 642         if (!is_multicast_ether_addr(hdr->addr1) ||
 643             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
 644                 /* Update last_rx only for unicast frames in order to prevent
 645                  * the Probe Request frames (the only broadcast frames from a
 646                  * STA in infrastructure mode) from keeping a connection alive.
 647                  */
 648                 sta->last_rx = jiffies;
 649         }
 650
 651         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 652                 return TXRX_CONTINUE;
 653
 654         sta->rx_fragments++;
 655         sta->rx_bytes += rx->skb->len;
 656         sta->last_rssi = rx->u.rx.status->ssi;
 657         sta->last_signal = rx->u.rx.status->signal;
 658         sta->last_noise = rx->u.rx.status->noise;
 659
 660         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
 661                 /* Change STA power saving mode only in the end of a frame
 662                  * exchange sequence */
 663                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
 664                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
 665                 else if (!(sta->flags & WLAN_STA_PS) &&
 666                          (rx->fc & IEEE80211_FCTL_PM))
 667                         ap_sta_ps_start(dev, sta);
 668         }
 669
 670         /* Drop data::nullfunc frames silently, since they are used only to
 671          * control station power saving mode. */
 672         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 673             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
 674                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 675                 /* Update counter and free packet here to avoid counting this
 676                  * as a dropped packed. */
 677                 sta->rx_packets++;
 678                 dev_kfree_skb(rx->skb);
 679                 return TXRX_QUEUED;
 680         }
 681
 682         return TXRX_CONTINUE;
 683 } /* ieee80211_rx_h_sta_process */
 684
 685 static inline struct ieee80211_fragment_entry *
 686 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 687                          unsigned int frag, unsigned int seq, int rx_queue,
 688                          struct sk_buff **skb)
 689 {
 690         struct ieee80211_fragment_entry *entry;
 691         int idx;
 692
 693         idx = sdata->fragment_next;
 694         entry = &sdata->fragments[sdata->fragment_next++];
 695         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 696                 sdata->fragment_next = 0;
 697
 698         if (!skb_queue_empty(&entry->skb_list)) {
 699 #ifdef CONFIG_MAC80211_DEBUG
 700                 struct ieee80211_hdr *hdr =
 701                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 702                 DECLARE_MAC_BUF(mac);
 703                 DECLARE_MAC_BUF(mac2);
 704                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 705                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 706                        "addr1=%s addr2=%s\n",
 707                        sdata->dev->name, idx,
 708                        jiffies - entry->first_frag_time, entry->seq,
 709                        entry->last_frag, print_mac(mac, hdr->addr1),
 710                        print_mac(mac2, hdr->addr2));
 711 #endif /* CONFIG_MAC80211_DEBUG */
 712                 __skb_queue_purge(&entry->skb_list);
 713         }
 714
 715         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 716         *skb = NULL;
 717         entry->first_frag_time = jiffies;
 718         entry->seq = seq;
 719         entry->rx_queue = rx_queue;
 720         entry->last_frag = frag;
 721         entry->ccmp = 0;
 722         entry->extra_len = 0;
 723
 724         return entry;
 725 }
 726
 727 static inline struct ieee80211_fragment_entry *
 728 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 729                           u16 fc, unsigned int frag, unsigned int seq,
 730                           int rx_queue, struct ieee80211_hdr *hdr)
 731 {
 732         struct ieee80211_fragment_entry *entry;
 733         int i, idx;
 734
 735         idx = sdata->fragment_next;
 736         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 737                 struct ieee80211_hdr *f_hdr;
 738                 u16 f_fc;
 739
 740                 idx--;
 741                 if (idx < 0)
 742                         idx = IEEE80211_FRAGMENT_MAX - 1;
 743
 744                 entry = &sdata->fragments[idx];
 745                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 746                     entry->rx_queue != rx_queue ||
 747                     entry->last_frag + 1 != frag)
 748                         continue;
 749
 750                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 751                 f_fc = le16_to_cpu(f_hdr->frame_control);
 752
 753                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 754                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 755                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 756                         continue;
 757
 758                 if (entry->first_frag_time + 2 * HZ < jiffies) {
 759                         __skb_queue_purge(&entry->skb_list);
 760                         continue;
 761                 }
 762                 return entry;
 763         }
 764
 765         return NULL;
 766 }
 767
 768 static ieee80211_txrx_result
 769 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 770 {
 771         struct ieee80211_hdr *hdr;
 772         u16 sc;
 773         unsigned int frag, seq;
 774         struct ieee80211_fragment_entry *entry;
 775         struct sk_buff *skb;
 776         DECLARE_MAC_BUF(mac);
 777
 778         hdr = (struct ieee80211_hdr *) rx->skb->data;
 779         sc = le16_to_cpu(hdr->seq_ctrl);
 780         frag = sc & IEEE80211_SCTL_FRAG;
 781
 782         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 783                    (rx->skb)->len < 24 ||
 784                    is_multicast_ether_addr(hdr->addr1))) {
 785                 /* not fragmented */
 786                 goto out;
 787         }
 788         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 789
 790         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 791
 792         if (frag == 0) {
 793                 /* This is the first fragment of a new frame. */
 794                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 795                                                  rx->u.rx.queue, &(rx->skb));
 796                 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
 797                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 798                         /* Store CCMP PN so that we can verify that the next
 799                          * fragment has a sequential PN value. */
 800                         entry->ccmp = 1;
 801                         memcpy(entry->last_pn,
 802                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 803                                CCMP_PN_LEN);
 804                 }
 805                 return TXRX_QUEUED;
 806         }
 807
 808         /* This is a fragment for a frame that should already be pending in
 809          * fragment cache. Add this fragment to the end of the pending entry.
 810          */
 811         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 812                                           rx->u.rx.queue, hdr);
 813         if (!entry) {
 814                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 815                 return TXRX_DROP;
 816         }
 817
 818         /* Verify that MPDUs within one MSDU have sequential PN values.
 819          * (IEEE 802.11i, 8.3.3.4.5) */
 820         if (entry->ccmp) {
 821                 int i;
 822                 u8 pn[CCMP_PN_LEN], *rpn;
 823                 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
 824                         return TXRX_DROP;
 825                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 826                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 827                         pn[i]++;
 828                         if (pn[i])
 829                                 break;
 830                 }
 831                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
 832                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
 833                         if (net_ratelimit())
 834                                 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
 835                                        "sequential A2=%s"
 836                                        " PN=%02x%02x%02x%02x%02x%02x "
 837                                        "(expected %02x%02x%02x%02x%02x%02x)\n",
 838                                        rx->dev->name, print_mac(mac, hdr->addr2),
 839                                        rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
 840                                        rpn[5], pn[0], pn[1], pn[2], pn[3],
 841                                        pn[4], pn[5]);
 842                         return TXRX_DROP;
 843                 }
 844                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 845         }
 846
 847         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 848         __skb_queue_tail(&entry->skb_list, rx->skb);
 849         entry->last_frag = frag;
 850         entry->extra_len += rx->skb->len;
 851         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 852                 rx->skb = NULL;
 853                 return TXRX_QUEUED;
 854         }
 855
 856         rx->skb = __skb_dequeue(&entry->skb_list);
 857         if (skb_tailroom(rx->skb) < entry->extra_len) {
 858                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 859                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 860                                               GFP_ATOMIC))) {
 861                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 862                         __skb_queue_purge(&entry->skb_list);
 863                         return TXRX_DROP;
 864                 }
 865         }
 866         while ((skb = __skb_dequeue(&entry->skb_list))) {
 867                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 868                 dev_kfree_skb(skb);
 869         }
 870
 871         /* Complete frame has been reassembled - process it now */
 872         rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
 873
 874  out:
 875         if (rx->sta)
 876                 rx->sta->rx_packets++;
 877         if (is_multicast_ether_addr(hdr->addr1))
 878                 rx->local->dot11MulticastReceivedFrameCount++;
 879         else
 880                 ieee80211_led_rx(rx->local);
 881         return TXRX_CONTINUE;
 882 }
 883
 884 static ieee80211_txrx_result
 885 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 886 {
 887         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
 888         struct sk_buff *skb;
 889         int no_pending_pkts;
 890         DECLARE_MAC_BUF(mac);
 891
 892         if (likely(!rx->sta ||
 893                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 894                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 895                    !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
 896                 return TXRX_CONTINUE;
 897
 898         if ((sdata->type != IEEE80211_IF_TYPE_AP) &&
 899             (sdata->type != IEEE80211_IF_TYPE_VLAN))
 900                 return TXRX_DROP;
 901
 902         skb = skb_dequeue(&rx->sta->tx_filtered);
 903         if (!skb) {
 904                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 905                 if (skb)
 906                         rx->local->total_ps_buffered--;
 907         }
 908         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 909                 skb_queue_empty(&rx->sta->ps_tx_buf);
 910
 911         if (skb) {
 912                 struct ieee80211_hdr *hdr =
 913                         (struct ieee80211_hdr *) skb->data;
 914
 915                 /* tell TX path to send one frame even though the STA may
 916                  * still remain is PS mode after this frame exchange */
 917                 rx->sta->pspoll = 1;
 918
 919 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 920                 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
 921                        print_mac(mac, rx->sta->addr), rx->sta->aid,
 922                        skb_queue_len(&rx->sta->ps_tx_buf));
 923 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 924
 925                 /* Use MoreData flag to indicate whether there are more
 926                  * buffered frames for this STA */
 927                 if (no_pending_pkts) {
 928                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 929                         rx->sta->flags &= ~WLAN_STA_TIM;
 930                 } else
 931                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 932
 933                 dev_queue_xmit(skb);
 934
 935                 if (no_pending_pkts) {
 936                         if (rx->local->ops->set_tim)
 937                                 rx->local->ops->set_tim(local_to_hw(rx->local),
 938                                                        rx->sta->aid, 0);
 939                         if (rx->sdata->bss)
 940                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
 941                 }
 942 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 943         } else if (!rx->u.rx.sent_ps_buffered) {
 944                 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
 945                        "though there is no buffered frames for it\n",
 946                        rx->dev->name, print_mac(mac, rx->sta->addr));
 947 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 948
 949         }
 950
 951         /* Free PS Poll skb here instead of returning TXRX_DROP that would
 952          * count as an dropped frame. */
 953         dev_kfree_skb(rx->skb);
 954
 955         return TXRX_QUEUED;
 956 }
 957
 958 static ieee80211_txrx_result
 959 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 960 {
 961         u16 fc = rx->fc;
 962         u8 *data = rx->skb->data;
 963         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 964
 965         if (!WLAN_FC_IS_QOS_DATA(fc))
 966                 return TXRX_CONTINUE;
 967
 968         /* remove the qos control field, update frame type and meta-data */
 969         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
 970         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
 971         /* change frame type to non QOS */
 972         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 973         hdr->frame_control = cpu_to_le16(fc);
 974
 975         return TXRX_CONTINUE;
 976 }
 977
 978 static int
 979 ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx)
 980 {
 981         if (unlikely(rx->sdata->ieee802_1x_pac &&
 982                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)))) {
 983 #ifdef CONFIG_MAC80211_DEBUG
 984                 printk(KERN_DEBUG "%s: dropped frame "
 985                        "(unauthorized port)\n", rx->dev->name);
 986 #endif /* CONFIG_MAC80211_DEBUG */
 987                 return -EACCES;
 988         }
 989
 990         return 0;
 991 }
 992
 993 static int
 994 ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx)
 995 {
 996         /*
 997          * Pass through unencrypted frames if the hardware has
 998          * decrypted them already.
 999          */
1000         if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
1001                 return 0;
1002
1003         /* Drop unencrypted frames if key is set. */
1004         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1005                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1006                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1007                      (rx->key || rx->sdata->drop_unencrypted))) {
1008                 if (net_ratelimit())
1009                         printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1010                                "encryption\n", rx->dev->name);
1011                 return -EACCES;
1012         }
1013         return 0;
1014 }
1015
1016 static int
1017 ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1018 {
1019         struct net_device *dev = rx->dev;
1020         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1021         u16 fc, hdrlen, ethertype;
1022         u8 *payload;
1023         u8 dst[ETH_ALEN];
1024         u8 src[ETH_ALEN];
1025         struct sk_buff *skb = rx->skb;
1026         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1027         DECLARE_MAC_BUF(mac);
1028         DECLARE_MAC_BUF(mac2);
1029         DECLARE_MAC_BUF(mac3);
1030         DECLARE_MAC_BUF(mac4);
1031
1032         fc = rx->fc;
1033
1034         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1035                 return -1;
1036
1037         hdrlen = ieee80211_get_hdrlen(fc);
1038
1039         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1040          * header
1041          * IEEE 802.11 address fields:
1042          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1043          *   0     0   DA    SA    BSSID n/a
1044          *   0     1   DA    BSSID SA    n/a
1045          *   1     0   BSSID SA    DA    n/a
1046          *   1     1   RA    TA    DA    SA
1047          */
1048
1049         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1050         case IEEE80211_FCTL_TODS:
1051                 /* BSSID SA DA */
1052                 memcpy(dst, hdr->addr3, ETH_ALEN);
1053                 memcpy(src, hdr->addr2, ETH_ALEN);
1054
1055                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1056                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1057                         if (net_ratelimit())
1058                                 printk(KERN_DEBUG "%s: dropped ToDS frame "
1059                                        "(BSSID=%s SA=%s DA=%s)\n",
1060                                        dev->name,
1061                                        print_mac(mac, hdr->addr1),
1062                                        print_mac(mac2, hdr->addr2),
1063                                        print_mac(mac3, hdr->addr3));
1064                         return -1;
1065                 }
1066                 break;
1067         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1068                 /* RA TA DA SA */
1069                 memcpy(dst, hdr->addr3, ETH_ALEN);
1070                 memcpy(src, hdr->addr4, ETH_ALEN);
1071
1072                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1073                         if (net_ratelimit())
1074                                 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1075                                        "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1076                                        rx->dev->name,
1077                                        print_mac(mac, hdr->addr1),
1078                                        print_mac(mac2, hdr->addr2),
1079                                        print_mac(mac3, hdr->addr3),
1080                                        print_mac(mac4, hdr->addr4));
1081                         return -1;
1082                 }
1083                 break;
1084         case IEEE80211_FCTL_FROMDS:
1085                 /* DA BSSID SA */
1086                 memcpy(dst, hdr->addr1, ETH_ALEN);
1087                 memcpy(src, hdr->addr3, ETH_ALEN);
1088
1089                 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1090                     (is_multicast_ether_addr(dst) &&
1091                      !compare_ether_addr(src, dev->dev_addr)))
1092                         return -1;
1093                 break;
1094         case 0:
1095                 /* DA SA BSSID */
1096                 memcpy(dst, hdr->addr1, ETH_ALEN);
1097                 memcpy(src, hdr->addr2, ETH_ALEN);
1098
1099                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1100                         if (net_ratelimit()) {
1101                                 printk(KERN_DEBUG "%s: dropped IBSS frame "
1102                                        "(DA=%s SA=%s BSSID=%s)\n",
1103                                        dev->name,
1104                                        print_mac(mac, hdr->addr1),
1105                                        print_mac(mac2, hdr->addr2),
1106                                        print_mac(mac3, hdr->addr3));
1107                         }
1108                         return -1;
1109                 }
1110                 break;
1111         }
1112
1113         if (unlikely(skb->len - hdrlen < 8)) {
1114                 if (net_ratelimit()) {
1115                         printk(KERN_DEBUG "%s: RX too short data frame "
1116                                "payload\n", dev->name);
1117                 }
1118                 return -1;
1119         }
1120
1121         payload = skb->data + hdrlen;
1122         ethertype = (payload[6] << 8) | payload[7];
1123
1124         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1125                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1126                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1127                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1128                  * replace EtherType */
1129                 skb_pull(skb, hdrlen + 6);
1130                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1131                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1132         } else {
1133                 struct ethhdr *ehdr;
1134                 __be16 len;
1135
1136                 skb_pull(skb, hdrlen);
1137                 len = htons(skb->len);
1138                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1139                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1140                 memcpy(ehdr->h_source, src, ETH_ALEN);
1141                 ehdr->h_proto = len;
1142         }
1143         return 0;
1144 }
1145
1146 /*
1147  * requires that rx->skb is a frame with ethernet header
1148  */
1149 static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx)
1150 {
1151         static const u8 pae_group_addr[ETH_ALEN]
1152                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1153         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1154
1155         /*
1156          * Allow EAPOL frames to us/the PAE group address regardless
1157          * of whether the frame was encrypted or not.
1158          */
1159         if (ehdr->h_proto == htons(ETH_P_PAE) &&
1160             (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1161              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1162                 return true;
1163
1164         if (ieee80211_802_1x_port_control(rx) ||
1165             ieee80211_drop_unencrypted(rx))
1166                 return false;
1167
1168         return true;
1169 }
1170
1171 /*
1172  * requires that rx->skb is a frame with ethernet header
1173  */
1174 static void
1175 ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1176 {
1177         struct net_device *dev = rx->dev;
1178         struct ieee80211_local *local = rx->local;
1179         struct sk_buff *skb, *xmit_skb;
1180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1182         struct sta_info *dsta;
1183
1184         skb = rx->skb;
1185         xmit_skb = NULL;
1186
1187         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP ||
1188                                       sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1189             (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1190                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1191                         /*
1192                          * send multicast frames both to higher layers in
1193                          * local net stack and back to the wireless medium
1194                          */
1195                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1196                         if (!xmit_skb && net_ratelimit())
1197                                 printk(KERN_DEBUG "%s: failed to clone "
1198                                        "multicast frame\n", dev->name);
1199                 } else {
1200                         dsta = sta_info_get(local, skb->data);
1201                         if (dsta && dsta->dev == dev) {
1202                                 /*
1203                                  * The destination station is associated to
1204                                  * this AP (in this VLAN), so send the frame
1205                                  * directly to it and do not pass it to local
1206                                  * net stack.
1207                                  */
1208                                 xmit_skb = skb;
1209                                 skb = NULL;
1210                         }
1211                         if (dsta)
1212                                 sta_info_put(dsta);
1213                 }
1214         }
1215
1216         if (skb) {
1217                 /* deliver to local stack */
1218                 skb->protocol = eth_type_trans(skb, dev);
1219                 memset(skb->cb, 0, sizeof(skb->cb));
1220                 netif_rx(skb);
1221         }
1222
1223         if (xmit_skb) {
1224                 /* send to wireless media */
1225                 xmit_skb->protocol = htons(ETH_P_802_3);
1226                 skb_reset_network_header(xmit_skb);
1227                 skb_reset_mac_header(xmit_skb);
1228                 dev_queue_xmit(xmit_skb);
1229         }
1230 }
1231
1232 static ieee80211_txrx_result
1233 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
1234 {
1235         struct net_device *dev = rx->dev;
1236         struct ieee80211_local *local = rx->local;
1237         u16 fc, ethertype;
1238         u8 *payload;
1239         struct sk_buff *skb = rx->skb, *frame = NULL;
1240         const struct ethhdr *eth;
1241         int remaining, err;
1242         u8 dst[ETH_ALEN];
1243         u8 src[ETH_ALEN];
1244         DECLARE_MAC_BUF(mac);
1245
1246         fc = rx->fc;
1247         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1248                 return TXRX_CONTINUE;
1249
1250         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1251                 return TXRX_DROP;
1252
1253         if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
1254                 return TXRX_CONTINUE;
1255
1256         err = ieee80211_data_to_8023(rx);
1257         if (unlikely(err))
1258                 return TXRX_DROP;
1259
1260         skb->dev = dev;
1261
1262         dev->stats.rx_packets++;
1263         dev->stats.rx_bytes += skb->len;
1264
1265         /* skip the wrapping header */
1266         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1267         if (!eth)
1268                 return TXRX_DROP;
1269
1270         while (skb != frame) {
1271                 u8 padding;
1272                 __be16 len = eth->h_proto;
1273                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1274
1275                 remaining = skb->len;
1276                 memcpy(dst, eth->h_dest, ETH_ALEN);
1277                 memcpy(src, eth->h_source, ETH_ALEN);
1278
1279                 padding = ((4 - subframe_len) & 0x3);
1280                 /* the last MSDU has no padding */
1281                 if (subframe_len > remaining) {
1282                         printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
1283                         return TXRX_DROP;
1284                 }
1285
1286                 skb_pull(skb, sizeof(struct ethhdr));
1287                 /* if last subframe reuse skb */
1288                 if (remaining <= subframe_len + padding)
1289                         frame = skb;
1290                 else {
1291                         frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1292                                               subframe_len);
1293
1294                         if (frame == NULL)
1295                                 return TXRX_DROP;
1296
1297                         skb_reserve(frame, local->hw.extra_tx_headroom +
1298                                     sizeof(struct ethhdr));
1299                         memcpy(skb_put(frame, ntohs(len)), skb->data,
1300                                 ntohs(len));
1301
1302                         eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1303                                                         padding);
1304                         if (!eth) {
1305                                 printk(KERN_DEBUG "%s: wrong buffer size ",
1306                                        dev->name);
1307                                 dev_kfree_skb(frame);
1308                                 return TXRX_DROP;
1309                         }
1310                 }
1311
1312                 skb_reset_network_header(frame);
1313                 frame->dev = dev;
1314                 frame->priority = skb->priority;
1315                 rx->skb = frame;
1316
1317                 payload = frame->data;
1318                 ethertype = (payload[6] << 8) | payload[7];
1319
1320                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1321                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1322                            compare_ether_addr(payload,
1323                                               bridge_tunnel_header) == 0)) {
1324                         /* remove RFC1042 or Bridge-Tunnel
1325                          * encapsulation and replace EtherType */
1326                         skb_pull(frame, 6);
1327                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1328                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1329                 } else {
1330                         memcpy(skb_push(frame, sizeof(__be16)),
1331                                &len, sizeof(__be16));
1332                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1333                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1334                 }
1335
1336                 if (!ieee80211_frame_allowed(rx)) {
1337                         if (skb == frame) /* last frame */
1338                                 return TXRX_DROP;
1339                         dev_kfree_skb(frame);
1340                         continue;
1341                 }
1342
1343                 ieee80211_deliver_skb(rx);
1344         }
1345
1346         return TXRX_QUEUED;
1347 }
1348
1349 static ieee80211_txrx_result
1350 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1351 {
1352         struct net_device *dev = rx->dev;
1353         u16 fc;
1354         int err;
1355
1356         fc = rx->fc;
1357         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1358                 return TXRX_CONTINUE;
1359
1360         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1361                 return TXRX_DROP;
1362
1363         err = ieee80211_data_to_8023(rx);
1364         if (unlikely(err))
1365                 return TXRX_DROP;
1366
1367         if (!ieee80211_frame_allowed(rx))
1368                 return TXRX_DROP;
1369
1370         rx->skb->dev = dev;
1371
1372         dev->stats.rx_packets++;
1373         dev->stats.rx_bytes += rx->skb->len;
1374
1375         ieee80211_deliver_skb(rx);
1376
1377         return TXRX_QUEUED;
1378 }
1379
1380 static ieee80211_txrx_result
1381 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1382 {
1383         struct ieee80211_sub_if_data *sdata;
1384
1385         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1386                 return TXRX_DROP;
1387
1388         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1389         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1390              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1391             !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1392                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1393         else
1394                 return TXRX_DROP;
1395
1396         return TXRX_QUEUED;
1397 }
1398
1399 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1400                                 struct ieee80211_local *local,
1401                                 ieee80211_rx_handler *handlers,
1402                                 struct ieee80211_txrx_data *rx,
1403                                 struct sta_info *sta)
1404 {
1405         ieee80211_rx_handler *handler;
1406         ieee80211_txrx_result res = TXRX_DROP;
1407
1408         for (handler = handlers; *handler != NULL; handler++) {
1409                 res = (*handler)(rx);
1410
1411                 switch (res) {
1412                 case TXRX_CONTINUE:
1413                         continue;
1414                 case TXRX_DROP:
1415                         I802_DEBUG_INC(local->rx_handlers_drop);
1416                         if (sta)
1417                                 sta->rx_dropped++;
1418                         break;
1419                 case TXRX_QUEUED:
1420                         I802_DEBUG_INC(local->rx_handlers_queued);
1421                         break;
1422                 }
1423                 break;
1424         }
1425
1426         if (res == TXRX_DROP)
1427                 dev_kfree_skb(rx->skb);
1428         return res;
1429 }
1430
1431 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1432                                                 ieee80211_rx_handler *handlers,
1433                                                 struct ieee80211_txrx_data *rx,
1434                                                 struct sta_info *sta)
1435 {
1436         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1437             TXRX_CONTINUE)
1438                 dev_kfree_skb(rx->skb);
1439 }
1440
1441 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1442                                             struct ieee80211_hdr *hdr,
1443                                             struct sta_info *sta,
1444                                             struct ieee80211_txrx_data *rx)
1445 {
1446         int keyidx, hdrlen;
1447         DECLARE_MAC_BUF(mac);
1448         DECLARE_MAC_BUF(mac2);
1449
1450         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1451         if (rx->skb->len >= hdrlen + 4)
1452                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1453         else
1454                 keyidx = -1;
1455
1456         if (net_ratelimit())
1457                 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1458                        "failure from %s to %s keyidx=%d\n",
1459                        dev->name, print_mac(mac, hdr->addr2),
1460                        print_mac(mac2, hdr->addr1), keyidx);
1461
1462         if (!sta) {
1463                 /*
1464                  * Some hardware seem to generate incorrect Michael MIC
1465                  * reports; ignore them to avoid triggering countermeasures.
1466                  */
1467                 if (net_ratelimit())
1468                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1469                                "error for unknown address %s\n",
1470                                dev->name, print_mac(mac, hdr->addr2));
1471                 goto ignore;
1472         }
1473
1474         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1475                 if (net_ratelimit())
1476                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1477                                "error for a frame with no PROTECTED flag (src "
1478                                "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1479                 goto ignore;
1480         }
1481
1482         if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1483                 /*
1484                  * APs with pairwise keys should never receive Michael MIC
1485                  * errors for non-zero keyidx because these are reserved for
1486                  * group keys and only the AP is sending real multicast
1487                  * frames in the BSS.
1488                  */
1489                 if (net_ratelimit())
1490                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1491                                "a frame with non-zero keyidx (%d)"
1492                                " (src %s)\n", dev->name, keyidx,
1493                                print_mac(mac, hdr->addr2));
1494                 goto ignore;
1495         }
1496
1497         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1498             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1499              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1500                 if (net_ratelimit())
1501                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1502                                "error for a frame that cannot be encrypted "
1503                                "(fc=0x%04x) (src %s)\n",
1504                                dev->name, rx->fc, print_mac(mac, hdr->addr2));
1505                 goto ignore;
1506         }
1507
1508         mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1509  ignore:
1510         dev_kfree_skb(rx->skb);
1511         rx->skb = NULL;
1512 }
1513
1514 ieee80211_rx_handler ieee80211_rx_handlers[] =
1515 {
1516         ieee80211_rx_h_if_stats,
1517         ieee80211_rx_h_passive_scan,
1518         ieee80211_rx_h_check,
1519         ieee80211_rx_h_decrypt,
1520         ieee80211_rx_h_sta_process,
1521         ieee80211_rx_h_defragment,
1522         ieee80211_rx_h_ps_poll,
1523         ieee80211_rx_h_michael_mic_verify,
1524         /* this must be after decryption - so header is counted in MPDU mic
1525          * must be before pae and data, so QOS_DATA format frames
1526          * are not passed to user space by these functions
1527          */
1528         ieee80211_rx_h_remove_qos_control,
1529         ieee80211_rx_h_amsdu,
1530         ieee80211_rx_h_data,
1531         ieee80211_rx_h_mgmt,
1532         NULL
1533 };
1534
1535 /* main receive path */
1536
1537 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1538                                 u8 *bssid, struct ieee80211_txrx_data *rx,
1539                                 struct ieee80211_hdr *hdr)
1540 {
1541         int multicast = is_multicast_ether_addr(hdr->addr1);
1542
1543         switch (sdata->type) {
1544         case IEEE80211_IF_TYPE_STA:
1545                 if (!bssid)
1546                         return 0;
1547                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1548                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1549                                 return 0;
1550                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1551                 } else if (!multicast &&
1552                            compare_ether_addr(sdata->dev->dev_addr,
1553                                               hdr->addr1) != 0) {
1554                         if (!(sdata->dev->flags & IFF_PROMISC))
1555                                 return 0;
1556                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1557                 }
1558                 break;
1559         case IEEE80211_IF_TYPE_IBSS:
1560                 if (!bssid)
1561                         return 0;
1562                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1563                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1564                                 return 0;
1565                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1566                 } else if (!multicast &&
1567                            compare_ether_addr(sdata->dev->dev_addr,
1568                                               hdr->addr1) != 0) {
1569                         if (!(sdata->dev->flags & IFF_PROMISC))
1570                                 return 0;
1571                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1572                 } else if (!rx->sta)
1573                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1574                                                          bssid, hdr->addr2);
1575                 break;
1576         case IEEE80211_IF_TYPE_VLAN:
1577         case IEEE80211_IF_TYPE_AP:
1578                 if (!bssid) {
1579                         if (compare_ether_addr(sdata->dev->dev_addr,
1580                                                hdr->addr1))
1581                                 return 0;
1582                 } else if (!ieee80211_bssid_match(bssid,
1583                                         sdata->dev->dev_addr)) {
1584                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1585                                 return 0;
1586                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1587                 }
1588                 if (sdata->dev == sdata->local->mdev &&
1589                     !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1590                         /* do not receive anything via
1591                          * master device when not scanning */
1592                         return 0;
1593                 break;
1594         case IEEE80211_IF_TYPE_WDS:
1595                 if (bssid ||
1596                     (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1597                         return 0;
1598                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1599                         return 0;
1600                 break;
1601         case IEEE80211_IF_TYPE_MNTR:
1602                 /* take everything */
1603                 break;
1604         case IEEE80211_IF_TYPE_INVALID:
1605                 /* should never get here */
1606                 WARN_ON(1);
1607                 break;
1608         }
1609
1610         return 1;
1611 }
1612
1613 /*
1614  * This is the actual Rx frames handler. as it blongs to Rx path it must
1615  * be called with rcu_read_lock protection.
1616  */
1617 void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, struct sk_buff *skb,
1618                             struct ieee80211_rx_status *status, u32 load)
1619 {
1620         struct ieee80211_local *local = hw_to_local(hw);
1621         struct ieee80211_sub_if_data *sdata;
1622         struct sta_info *sta;
1623         struct ieee80211_hdr *hdr;
1624         struct ieee80211_txrx_data rx;
1625         u16 type;
1626         int prepares;
1627         struct ieee80211_sub_if_data *prev = NULL;
1628         struct sk_buff *skb_new;
1629         u8 *bssid;
1630         int hdrlen;
1631
1632         hdr = (struct ieee80211_hdr *) skb->data;
1633         memset(&rx, 0, sizeof(rx));
1634         rx.skb = skb;
1635         rx.local = local;
1636
1637         rx.u.rx.status = status;
1638         rx.u.rx.load = load;
1639         rx.fc = le16_to_cpu(hdr->frame_control);
1640         type = rx.fc & IEEE80211_FCTL_FTYPE;
1641
1642         /*
1643          * Drivers are required to align the payload data to a four-byte
1644          * boundary, so the last two bits of the address where it starts
1645          * may not be set. The header is required to be directly before
1646          * the payload data, padding like atheros hardware adds which is
1647          * inbetween the 802.11 header and the payload is not supported,
1648          * the driver is required to move the 802.11 header further back
1649          * in that case.
1650          */
1651         hdrlen = ieee80211_get_hdrlen(rx.fc);
1652         WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
1653
1654         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1655                 local->dot11ReceivedFragmentCount++;
1656
1657         sta = rx.sta = sta_info_get(local, hdr->addr2);
1658         if (sta) {
1659                 rx.dev = rx.sta->dev;
1660                 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1661         }
1662
1663         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1664                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1665                 goto end;
1666         }
1667
1668         if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1669                 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1670
1671         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1672                                            sta) != TXRX_CONTINUE)
1673                 goto end;
1674         skb = rx.skb;
1675
1676         if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1677             !atomic_read(&local->iff_promiscs) &&
1678             !is_multicast_ether_addr(hdr->addr1)) {
1679                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1680                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1681                                              rx.sta);
1682                 sta_info_put(sta);
1683                 rcu_read_unlock();
1684                 return;
1685         }
1686
1687         bssid = ieee80211_get_bssid(hdr, skb->len);
1688
1689         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1690                 if (!netif_running(sdata->dev))
1691                         continue;
1692
1693                 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1694                         continue;
1695
1696                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1697                 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1698                 /* prepare_for_handlers can change sta */
1699                 sta = rx.sta;
1700
1701                 if (!prepares)
1702                         continue;
1703
1704                 /*
1705                  * frame is destined for this interface, but if it's not
1706                  * also for the previous one we handle that after the
1707                  * loop to avoid copying the SKB once too much
1708                  */
1709
1710                 if (!prev) {
1711                         prev = sdata;
1712                         continue;
1713                 }
1714
1715                 /*
1716                  * frame was destined for the previous interface
1717                  * so invoke RX handlers for it
1718                  */
1719
1720                 skb_new = skb_copy(skb, GFP_ATOMIC);
1721                 if (!skb_new) {
1722                         if (net_ratelimit())
1723                                 printk(KERN_DEBUG "%s: failed to copy "
1724                                        "multicast frame for %s",
1725                                        wiphy_name(local->hw.wiphy),
1726                                        prev->dev->name);
1727                         continue;
1728                 }
1729                 rx.fc = le16_to_cpu(hdr->frame_control);
1730                 rx.skb = skb_new;
1731                 rx.dev = prev->dev;
1732                 rx.sdata = prev;
1733                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1734                                              &rx, sta);
1735                 prev = sdata;
1736         }
1737         if (prev) {
1738                 rx.fc = le16_to_cpu(hdr->frame_control);
1739                 rx.skb = skb;
1740                 rx.dev = prev->dev;
1741                 rx.sdata = prev;
1742                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1743                                              &rx, sta);
1744         } else
1745                 dev_kfree_skb(skb);
1746
1747  end:
1748         if (sta)
1749                 sta_info_put(sta);
1750 }
1751
1752 /*
1753  * This is the receive path handler. It is called by a low level driver when an
1754  * 802.11 MPDU is received from the hardware.
1755  */
1756 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1757                     struct ieee80211_rx_status *status)
1758 {
1759         struct ieee80211_local *local = hw_to_local(hw);
1760         u32 pkt_load;
1761
1762         /*
1763          * key references and virtual interfaces are protected using RCU
1764          * and this requires that we are in a read-side RCU section during
1765          * receive processing
1766          */
1767         rcu_read_lock();
1768
1769         /*
1770          * Frames with failed FCS/PLCP checksum are not returned,
1771          * all other frames are returned without radiotap header
1772          * if it was previously present.
1773          * Also, frames with less than 16 bytes are dropped.
1774          */
1775         skb = ieee80211_rx_monitor(local, skb, status);
1776         if (!skb) {
1777                 rcu_read_unlock();
1778                 return;
1779         }
1780
1781         pkt_load = ieee80211_rx_load_stats(local, skb, status);
1782
1783         __ieee80211_rx_handle_packet(hw, skb, status, pkt_load);
1784
1785         rcu_read_unlock();
1786 }
1787 EXPORT_SYMBOL(__ieee80211_rx);
1788
1789 /* This is a version of the rx handler that can be called from hard irq
1790  * context. Post the skb on the queue and schedule the tasklet */
1791 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1792                           struct ieee80211_rx_status *status)
1793 {
1794         struct ieee80211_local *local = hw_to_local(hw);
1795
1796         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1797
1798         skb->dev = local->mdev;
1799         /* copy status into skb->cb for use by tasklet */
1800         memcpy(skb->cb, status, sizeof(*status));
1801         skb->pkt_type = IEEE80211_RX_MSG;
1802         skb_queue_tail(&local->skb_queue, skb);
1803         tasklet_schedule(&local->tasklet);
1804 }
1805 EXPORT_SYMBOL(ieee80211_rx_irqsafe);