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                 return 1;
  67         return 0;
  68 }
  69
  70 /*
  71  * This function copies a received frame to all monitor interfaces and
  72  * returns a cleaned-up SKB that no longer includes the FCS nor the
  73  * radiotap header the driver might have added.
  74  */
  75 static struct sk_buff *
  76 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
  77                      struct ieee80211_rx_status *status)
  78 {
  79         struct ieee80211_sub_if_data *sdata;
  80         struct ieee80211_rate *rate;
  81         int needed_headroom = 0;
  82         struct ieee80211_radiotap_header *rthdr;
  83         __le64 *rttsft = NULL;
  84         struct ieee80211_rtap_fixed_data {
  85                 u8 flags;
  86                 u8 rate;
  87                 __le16 chan_freq;
  88                 __le16 chan_flags;
  89                 u8 antsignal;
  90                 u8 padding_for_rxflags;
  91                 __le16 rx_flags;
  92         } __attribute__ ((packed)) *rtfixed;
  93         struct sk_buff *skb, *skb2;
  94         struct net_device *prev_dev = NULL;
  95         int present_fcs_len = 0;
  96         int rtap_len = 0;
  97
  98         /*
  99          * First, we may need to make a copy of the skb because
 100          *  (1) we need to modify it for radiotap (if not present), and
 101          *  (2) the other RX handlers will modify the skb we got.
 102          *
 103          * We don't need to, of course, if we aren't going to return
 104          * the SKB because it has a bad FCS/PLCP checksum.
 105          */
 106         if (status->flag & RX_FLAG_RADIOTAP)
 107                 rtap_len = ieee80211_get_radiotap_len(origskb->data);
 108         else
 109                 /* room for radiotap header, always present fields and TSFT */
 110                 needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
 111
 112         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 113                 present_fcs_len = FCS_LEN;
 114
 115         if (!local->monitors) {
 116                 if (should_drop_frame(status, origskb, present_fcs_len,
 117                                       rtap_len)) {
 118                         dev_kfree_skb(origskb);
 119                         return NULL;
 120                 }
 121
 122                 return remove_monitor_info(local, origskb, rtap_len);
 123         }
 124
 125         if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
 126                 /* only need to expand headroom if necessary */
 127                 skb = origskb;
 128                 origskb = NULL;
 129
 130                 /*
 131                  * This shouldn't trigger often because most devices have an
 132                  * RX header they pull before we get here, and that should
 133                  * be big enough for our radiotap information. We should
 134                  * probably export the length to drivers so that we can have
 135                  * them allocate enough headroom to start with.
 136                  */
 137                 if (skb_headroom(skb) < needed_headroom &&
 138                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 139                         dev_kfree_skb(skb);
 140                         return NULL;
 141                 }
 142         } else {
 143                 /*
 144                  * Need to make a copy and possibly remove radiotap header
 145                  * and FCS from the original.
 146                  */
 147                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 148
 149                 origskb = remove_monitor_info(local, origskb, rtap_len);
 150
 151                 if (!skb)
 152                         return origskb;
 153         }
 154
 155         /* if necessary, prepend radiotap information */
 156         if (!(status->flag & RX_FLAG_RADIOTAP)) {
 157                 rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
 158                 rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
 159                 if (status->flag & RX_FLAG_TSFT) {
 160                         rttsft = (void *) skb_push(skb, sizeof(*rttsft));
 161                         rtap_len += 8;
 162                 }
 163                 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
 164                 memset(rthdr, 0, sizeof(*rthdr));
 165                 memset(rtfixed, 0, sizeof(*rtfixed));
 166                 rthdr->it_present =
 167                         cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 168                                     (1 << IEEE80211_RADIOTAP_RATE) |
 169                                     (1 << IEEE80211_RADIOTAP_CHANNEL) |
 170                                     (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
 171                                     (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 172                 rtfixed->flags = 0;
 173                 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 174                         rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
 175
 176                 if (rttsft) {
 177                         *rttsft = cpu_to_le64(status->mactime);
 178                         rthdr->it_present |=
 179                                 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 180                 }
 181
 182                 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
 183                 rtfixed->rx_flags = 0;
 184                 if (status->flag &
 185                     (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 186                         rtfixed->rx_flags |=
 187                                 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
 188
 189                 rate = ieee80211_get_rate(local, status->phymode,
 190                                           status->rate);
 191                 if (rate)
 192                         rtfixed->rate = rate->rate / 5;
 193
 194                 rtfixed->chan_freq = cpu_to_le16(status->freq);
 195
 196                 if (status->phymode == MODE_IEEE80211A)
 197                         rtfixed->chan_flags =
 198                                 cpu_to_le16(IEEE80211_CHAN_OFDM |
 199                                             IEEE80211_CHAN_5GHZ);
 200                 else
 201                         rtfixed->chan_flags =
 202                                 cpu_to_le16(IEEE80211_CHAN_DYN |
 203                                             IEEE80211_CHAN_2GHZ);
 204
 205                 rtfixed->antsignal = status->ssi;
 206                 rthdr->it_len = cpu_to_le16(rtap_len);
 207         }
 208
 209         skb_set_mac_header(skb, 0);
 210         skb->ip_summed = CHECKSUM_UNNECESSARY;
 211         skb->pkt_type = PACKET_OTHERHOST;
 212         skb->protocol = htons(ETH_P_802_2);
 213
 214         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 215                 if (!netif_running(sdata->dev))
 216                         continue;
 217
 218                 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
 219                         continue;
 220
 221                 if (prev_dev) {
 222                         skb2 = skb_clone(skb, GFP_ATOMIC);
 223                         if (skb2) {
 224                                 skb2->dev = prev_dev;
 225                                 netif_rx(skb2);
 226                         }
 227                 }
 228
 229                 prev_dev = sdata->dev;
 230                 sdata->dev->stats.rx_packets++;
 231                 sdata->dev->stats.rx_bytes += skb->len;
 232         }
 233
 234         if (prev_dev) {
 235                 skb->dev = prev_dev;
 236                 netif_rx(skb);
 237         } else
 238                 dev_kfree_skb(skb);
 239
 240         return origskb;
 241 }
 242
 243
 244 /* pre-rx handlers
 245  *
 246  * these don't have dev/sdata fields in the rx data
 247  * The sta value should also not be used because it may
 248  * be NULL even though a STA (in IBSS mode) will be added.
 249  */
 250
 251 static ieee80211_txrx_result
 252 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
 253 {
 254         u8 *data = rx->skb->data;
 255         int tid;
 256
 257         /* does the frame have a qos control field? */
 258         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
 259                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
 260                 /* frame has qos control */
 261                 tid = qc[0] & QOS_CONTROL_TID_MASK;
 262                 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
 263                         rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
 264                 else
 265                         rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
 266         } else {
 267                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
 268                         /* Separate TID for management frames */
 269                         tid = NUM_RX_DATA_QUEUES - 1;
 270                 } else {
 271                         /* no qos control present */
 272                         tid = 0; /* 802.1d - Best Effort */
 273                 }
 274         }
 275
 276         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
 277         /* only a debug counter, sta might not be assigned properly yet */
 278         if (rx->sta)
 279                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
 280
 281         rx->u.rx.queue = tid;
 282         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 283          * For now, set skb->priority to 0 for other cases. */
 284         rx->skb->priority = (tid > 7) ? 0 : tid;
 285
 286         return TXRX_CONTINUE;
 287 }
 288
 289 static ieee80211_txrx_result
 290 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
 291 {
 292         struct ieee80211_local *local = rx->local;
 293         struct sk_buff *skb = rx->skb;
 294         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 295         u32 load = 0, hdrtime;
 296         struct ieee80211_rate *rate;
 297         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
 298         int i;
 299
 300         /* Estimate total channel use caused by this frame */
 301
 302         if (unlikely(mode->num_rates < 0))
 303                 return TXRX_CONTINUE;
 304
 305         rate = &mode->rates[0];
 306         for (i = 0; i < mode->num_rates; i++) {
 307                 if (mode->rates[i].val == rx->u.rx.status->rate) {
 308                         rate = &mode->rates[i];
 309                         break;
 310                 }
 311         }
 312
 313         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
 314          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
 315
 316         if (mode->mode == MODE_IEEE80211A ||
 317             (mode->mode == MODE_IEEE80211G &&
 318              rate->flags & IEEE80211_RATE_ERP))
 319                 hdrtime = CHAN_UTIL_HDR_SHORT;
 320         else
 321                 hdrtime = CHAN_UTIL_HDR_LONG;
 322
 323         load = hdrtime;
 324         if (!is_multicast_ether_addr(hdr->addr1))
 325                 load += hdrtime;
 326
 327         load += skb->len * rate->rate_inv;
 328
 329         /* Divide channel_use by 8 to avoid wrapping around the counter */
 330         load >>= CHAN_UTIL_SHIFT;
 331         local->channel_use_raw += load;
 332         rx->u.rx.load = load;
 333
 334         return TXRX_CONTINUE;
 335 }
 336
 337 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 338 {
 339         ieee80211_rx_h_parse_qos,
 340         ieee80211_rx_h_load_stats,
 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         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 407                 rx->skb->pkt_type = PACKET_OTHERHOST;
 408         else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
 409                 rx->skb->pkt_type = PACKET_HOST;
 410         else if (is_multicast_ether_addr(hdr->addr1)) {
 411                 if (is_broadcast_ether_addr(hdr->addr1))
 412                         rx->skb->pkt_type = PACKET_BROADCAST;
 413                 else
 414                         rx->skb->pkt_type = PACKET_MULTICAST;
 415         } else
 416                 rx->skb->pkt_type = PACKET_OTHERHOST;
 417
 418         /* Drop disallowed frame classes based on STA auth/assoc state;
 419          * IEEE 802.11, Chap 5.5.
 420          *
 421          * 80211.o does filtering only based on association state, i.e., it
 422          * drops Class 3 frames from not associated stations. hostapd sends
 423          * deauth/disassoc frames when needed. In addition, hostapd is
 424          * responsible for filtering on both auth and assoc states.
 425          */
 426         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
 427                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
 428                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
 429                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 430                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
 431                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
 432                      !(rx->fc & IEEE80211_FCTL_TODS) &&
 433                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
 434                     || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
 435                         /* Drop IBSS frames and frames for other hosts
 436                          * silently. */
 437                         return TXRX_DROP;
 438                 }
 439
 440                 return TXRX_DROP;
 441         }
 442
 443         return TXRX_CONTINUE;
 444 }
 445
 446
 447 static ieee80211_txrx_result
 448 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 449 {
 450         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 451         int keyidx;
 452         int hdrlen;
 453         ieee80211_txrx_result result = TXRX_DROP;
 454         struct ieee80211_key *stakey = NULL;
 455
 456         /*
 457          * Key selection 101
 458          *
 459          * There are three types of keys:
 460          *  - GTK (group keys)
 461          *  - PTK (pairwise keys)
 462          *  - STK (station-to-station pairwise keys)
 463          *
 464          * When selecting a key, we have to distinguish between multicast
 465          * (including broadcast) and unicast frames, the latter can only
 466          * use PTKs and STKs while the former always use GTKs. Unless, of
 467          * course, actual WEP keys ("pre-RSNA") are used, then unicast
 468          * frames can also use key indizes like GTKs. Hence, if we don't
 469          * have a PTK/STK we check the key index for a WEP key.
 470          *
 471          * Note that in a regular BSS, multicast frames are sent by the
 472          * AP only, associated stations unicast the frame to the AP first
 473          * which then multicasts it on their behalf.
 474          *
 475          * There is also a slight problem in IBSS mode: GTKs are negotiated
 476          * with each station, that is something we don't currently handle.
 477          * The spec seems to expect that one negotiates the same key with
 478          * every station but there's no such requirement; VLANs could be
 479          * possible.
 480          */
 481
 482         if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
 483                 return TXRX_CONTINUE;
 484
 485         /*
 486          * No point in finding a key and decrypting if the frame is neither
 487          * addressed to us nor a multicast frame.
 488          */
 489         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 490                 return TXRX_CONTINUE;
 491
 492         if (rx->sta)
 493                 stakey = rcu_dereference(rx->sta->key);
 494
 495         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
 496                 rx->key = stakey;
 497         } else {
 498                 /*
 499                  * The device doesn't give us the IV so we won't be
 500                  * able to look up the key. That's ok though, we
 501                  * don't need to decrypt the frame, we just won't
 502                  * be able to keep statistics accurate.
 503                  * Except for key threshold notifications, should
 504                  * we somehow allow the driver to tell us which key
 505                  * the hardware used if this flag is set?
 506                  */
 507                 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
 508                     (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
 509                         return TXRX_CONTINUE;
 510
 511                 hdrlen = ieee80211_get_hdrlen(rx->fc);
 512
 513                 if (rx->skb->len < 8 + hdrlen)
 514                         return TXRX_DROP; /* TODO: count this? */
 515
 516                 /*
 517                  * no need to call ieee80211_wep_get_keyidx,
 518                  * it verifies a bunch of things we've done already
 519                  */
 520                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
 521
 522                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
 523
 524                 /*
 525                  * RSNA-protected unicast frames should always be sent with
 526                  * pairwise or station-to-station keys, but for WEP we allow
 527                  * using a key index as well.
 528                  */
 529                 if (rx->key && rx->key->conf.alg != ALG_WEP &&
 530                     !is_multicast_ether_addr(hdr->addr1))
 531                         rx->key = NULL;
 532         }
 533
 534         if (rx->key) {
 535                 rx->key->tx_rx_count++;
 536                 /* TODO: add threshold stuff again */
 537         } else {
 538 #ifdef CONFIG_MAC80211_DEBUG
 539                 if (net_ratelimit())
 540                         printk(KERN_DEBUG "%s: RX protected frame,"
 541                                " but have no key\n", rx->dev->name);
 542 #endif /* CONFIG_MAC80211_DEBUG */
 543                 return TXRX_DROP;
 544         }
 545
 546         /* Check for weak IVs if possible */
 547         if (rx->sta && rx->key->conf.alg == ALG_WEP &&
 548             ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
 549             (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
 550              !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
 551             ieee80211_wep_is_weak_iv(rx->skb, rx->key))
 552                 rx->sta->wep_weak_iv_count++;
 553
 554         switch (rx->key->conf.alg) {
 555         case ALG_WEP:
 556                 result = ieee80211_crypto_wep_decrypt(rx);
 557                 break;
 558         case ALG_TKIP:
 559                 result = ieee80211_crypto_tkip_decrypt(rx);
 560                 break;
 561         case ALG_CCMP:
 562                 result = ieee80211_crypto_ccmp_decrypt(rx);
 563                 break;
 564         }
 565
 566         /* either the frame has been decrypted or will be dropped */
 567         rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
 568
 569         return result;
 570 }
 571
 572 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 573 {
 574         struct ieee80211_sub_if_data *sdata;
 575         DECLARE_MAC_BUF(mac);
 576
 577         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 578
 579         if (sdata->bss)
 580                 atomic_inc(&sdata->bss->num_sta_ps);
 581         sta->flags |= WLAN_STA_PS;
 582         sta->pspoll = 0;
 583 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 584         printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
 585                dev->name, print_mac(mac, sta->addr), sta->aid);
 586 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 587 }
 588
 589 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 590 {
 591         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 592         struct sk_buff *skb;
 593         int sent = 0;
 594         struct ieee80211_sub_if_data *sdata;
 595         struct ieee80211_tx_packet_data *pkt_data;
 596         DECLARE_MAC_BUF(mac);
 597
 598         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 599         if (sdata->bss)
 600                 atomic_dec(&sdata->bss->num_sta_ps);
 601         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
 602         sta->pspoll = 0;
 603         if (!skb_queue_empty(&sta->ps_tx_buf)) {
 604                 if (local->ops->set_tim)
 605                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
 606                 if (sdata->bss)
 607                         bss_tim_clear(local, sdata->bss, sta->aid);
 608         }
 609 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 610         printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
 611                dev->name, print_mac(mac, sta->addr), sta->aid);
 612 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 613         /* Send all buffered frames to the station */
 614         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 615                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 616                 sent++;
 617                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 618                 dev_queue_xmit(skb);
 619         }
 620         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 621                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 622                 local->total_ps_buffered--;
 623                 sent++;
 624 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 625                 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
 626                        "since STA not sleeping anymore\n", dev->name,
 627                        print_mac(mac, sta->addr), sta->aid);
 628 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 629                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 630                 dev_queue_xmit(skb);
 631         }
 632
 633         return sent;
 634 }
 635
 636 static ieee80211_txrx_result
 637 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 638 {
 639         struct sta_info *sta = rx->sta;
 640         struct net_device *dev = rx->dev;
 641         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 642
 643         if (!sta)
 644                 return TXRX_CONTINUE;
 645
 646         /* Update last_rx only for IBSS packets which are for the current
 647          * BSSID to avoid keeping the current IBSS network alive in cases where
 648          * other STAs are using different BSSID. */
 649         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
 650                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
 651                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 652                         sta->last_rx = jiffies;
 653         } else
 654         if (!is_multicast_ether_addr(hdr->addr1) ||
 655             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
 656                 /* Update last_rx only for unicast frames in order to prevent
 657                  * the Probe Request frames (the only broadcast frames from a
 658                  * STA in infrastructure mode) from keeping a connection alive.
 659                  */
 660                 sta->last_rx = jiffies;
 661         }
 662
 663         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 664                 return TXRX_CONTINUE;
 665
 666         sta->rx_fragments++;
 667         sta->rx_bytes += rx->skb->len;
 668         sta->last_rssi = rx->u.rx.status->ssi;
 669         sta->last_signal = rx->u.rx.status->signal;
 670         sta->last_noise = rx->u.rx.status->noise;
 671
 672         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
 673                 /* Change STA power saving mode only in the end of a frame
 674                  * exchange sequence */
 675                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
 676                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
 677                 else if (!(sta->flags & WLAN_STA_PS) &&
 678                          (rx->fc & IEEE80211_FCTL_PM))
 679                         ap_sta_ps_start(dev, sta);
 680         }
 681
 682         /* Drop data::nullfunc frames silently, since they are used only to
 683          * control station power saving mode. */
 684         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 685             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
 686                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 687                 /* Update counter and free packet here to avoid counting this
 688                  * as a dropped packed. */
 689                 sta->rx_packets++;
 690                 dev_kfree_skb(rx->skb);
 691                 return TXRX_QUEUED;
 692         }
 693
 694         return TXRX_CONTINUE;
 695 } /* ieee80211_rx_h_sta_process */
 696
 697 static inline struct ieee80211_fragment_entry *
 698 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 699                          unsigned int frag, unsigned int seq, int rx_queue,
 700                          struct sk_buff **skb)
 701 {
 702         struct ieee80211_fragment_entry *entry;
 703         int idx;
 704
 705         idx = sdata->fragment_next;
 706         entry = &sdata->fragments[sdata->fragment_next++];
 707         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 708                 sdata->fragment_next = 0;
 709
 710         if (!skb_queue_empty(&entry->skb_list)) {
 711 #ifdef CONFIG_MAC80211_DEBUG
 712                 struct ieee80211_hdr *hdr =
 713                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 714                 DECLARE_MAC_BUF(mac);
 715                 DECLARE_MAC_BUF(mac2);
 716                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 717                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 718                        "addr1=%s addr2=%s\n",
 719                        sdata->dev->name, idx,
 720                        jiffies - entry->first_frag_time, entry->seq,
 721                        entry->last_frag, print_mac(mac, hdr->addr1),
 722                        print_mac(mac2, hdr->addr2));
 723 #endif /* CONFIG_MAC80211_DEBUG */
 724                 __skb_queue_purge(&entry->skb_list);
 725         }
 726
 727         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 728         *skb = NULL;
 729         entry->first_frag_time = jiffies;
 730         entry->seq = seq;
 731         entry->rx_queue = rx_queue;
 732         entry->last_frag = frag;
 733         entry->ccmp = 0;
 734         entry->extra_len = 0;
 735
 736         return entry;
 737 }
 738
 739 static inline struct ieee80211_fragment_entry *
 740 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 741                           u16 fc, unsigned int frag, unsigned int seq,
 742                           int rx_queue, struct ieee80211_hdr *hdr)
 743 {
 744         struct ieee80211_fragment_entry *entry;
 745         int i, idx;
 746
 747         idx = sdata->fragment_next;
 748         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 749                 struct ieee80211_hdr *f_hdr;
 750                 u16 f_fc;
 751
 752                 idx--;
 753                 if (idx < 0)
 754                         idx = IEEE80211_FRAGMENT_MAX - 1;
 755
 756                 entry = &sdata->fragments[idx];
 757                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 758                     entry->rx_queue != rx_queue ||
 759                     entry->last_frag + 1 != frag)
 760                         continue;
 761
 762                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 763                 f_fc = le16_to_cpu(f_hdr->frame_control);
 764
 765                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 766                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 767                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 768                         continue;
 769
 770                 if (entry->first_frag_time + 2 * HZ < jiffies) {
 771                         __skb_queue_purge(&entry->skb_list);
 772                         continue;
 773                 }
 774                 return entry;
 775         }
 776
 777         return NULL;
 778 }
 779
 780 static ieee80211_txrx_result
 781 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 782 {
 783         struct ieee80211_hdr *hdr;
 784         u16 sc;
 785         unsigned int frag, seq;
 786         struct ieee80211_fragment_entry *entry;
 787         struct sk_buff *skb;
 788         DECLARE_MAC_BUF(mac);
 789
 790         hdr = (struct ieee80211_hdr *) rx->skb->data;
 791         sc = le16_to_cpu(hdr->seq_ctrl);
 792         frag = sc & IEEE80211_SCTL_FRAG;
 793
 794         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 795                    (rx->skb)->len < 24 ||
 796                    is_multicast_ether_addr(hdr->addr1))) {
 797                 /* not fragmented */
 798                 goto out;
 799         }
 800         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 801
 802         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 803
 804         if (frag == 0) {
 805                 /* This is the first fragment of a new frame. */
 806                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 807                                                  rx->u.rx.queue, &(rx->skb));
 808                 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
 809                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 810                         /* Store CCMP PN so that we can verify that the next
 811                          * fragment has a sequential PN value. */
 812                         entry->ccmp = 1;
 813                         memcpy(entry->last_pn,
 814                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 815                                CCMP_PN_LEN);
 816                 }
 817                 return TXRX_QUEUED;
 818         }
 819
 820         /* This is a fragment for a frame that should already be pending in
 821          * fragment cache. Add this fragment to the end of the pending entry.
 822          */
 823         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 824                                           rx->u.rx.queue, hdr);
 825         if (!entry) {
 826                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 827                 return TXRX_DROP;
 828         }
 829
 830         /* Verify that MPDUs within one MSDU have sequential PN values.
 831          * (IEEE 802.11i, 8.3.3.4.5) */
 832         if (entry->ccmp) {
 833                 int i;
 834                 u8 pn[CCMP_PN_LEN], *rpn;
 835                 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
 836                         return TXRX_DROP;
 837                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 838                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 839                         pn[i]++;
 840                         if (pn[i])
 841                                 break;
 842                 }
 843                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
 844                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
 845                         if (net_ratelimit())
 846                                 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
 847                                        "sequential A2=%s"
 848                                        " PN=%02x%02x%02x%02x%02x%02x "
 849                                        "(expected %02x%02x%02x%02x%02x%02x)\n",
 850                                        rx->dev->name, print_mac(mac, hdr->addr2),
 851                                        rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
 852                                        rpn[5], pn[0], pn[1], pn[2], pn[3],
 853                                        pn[4], pn[5]);
 854                         return TXRX_DROP;
 855                 }
 856                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 857         }
 858
 859         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 860         __skb_queue_tail(&entry->skb_list, rx->skb);
 861         entry->last_frag = frag;
 862         entry->extra_len += rx->skb->len;
 863         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 864                 rx->skb = NULL;
 865                 return TXRX_QUEUED;
 866         }
 867
 868         rx->skb = __skb_dequeue(&entry->skb_list);
 869         if (skb_tailroom(rx->skb) < entry->extra_len) {
 870                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 871                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 872                                               GFP_ATOMIC))) {
 873                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 874                         __skb_queue_purge(&entry->skb_list);
 875                         return TXRX_DROP;
 876                 }
 877         }
 878         while ((skb = __skb_dequeue(&entry->skb_list))) {
 879                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 880                 dev_kfree_skb(skb);
 881         }
 882
 883         /* Complete frame has been reassembled - process it now */
 884         rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
 885
 886  out:
 887         if (rx->sta)
 888                 rx->sta->rx_packets++;
 889         if (is_multicast_ether_addr(hdr->addr1))
 890                 rx->local->dot11MulticastReceivedFrameCount++;
 891         else
 892                 ieee80211_led_rx(rx->local);
 893         return TXRX_CONTINUE;
 894 }
 895
 896 static ieee80211_txrx_result
 897 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 898 {
 899         struct sk_buff *skb;
 900         int no_pending_pkts;
 901         DECLARE_MAC_BUF(mac);
 902
 903         if (likely(!rx->sta ||
 904                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 905                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 906                    !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
 907                 return TXRX_CONTINUE;
 908
 909         skb = skb_dequeue(&rx->sta->tx_filtered);
 910         if (!skb) {
 911                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 912                 if (skb)
 913                         rx->local->total_ps_buffered--;
 914         }
 915         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 916                 skb_queue_empty(&rx->sta->ps_tx_buf);
 917
 918         if (skb) {
 919                 struct ieee80211_hdr *hdr =
 920                         (struct ieee80211_hdr *) skb->data;
 921
 922                 /* tell TX path to send one frame even though the STA may
 923                  * still remain is PS mode after this frame exchange */
 924                 rx->sta->pspoll = 1;
 925
 926 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 927                 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
 928                        print_mac(mac, rx->sta->addr), rx->sta->aid,
 929                        skb_queue_len(&rx->sta->ps_tx_buf));
 930 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 931
 932                 /* Use MoreData flag to indicate whether there are more
 933                  * buffered frames for this STA */
 934                 if (no_pending_pkts) {
 935                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 936                         rx->sta->flags &= ~WLAN_STA_TIM;
 937                 } else
 938                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 939
 940                 dev_queue_xmit(skb);
 941
 942                 if (no_pending_pkts) {
 943                         if (rx->local->ops->set_tim)
 944                                 rx->local->ops->set_tim(local_to_hw(rx->local),
 945                                                        rx->sta->aid, 0);
 946                         if (rx->sdata->bss)
 947                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
 948                 }
 949 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 950         } else if (!rx->u.rx.sent_ps_buffered) {
 951                 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
 952                        "though there is no buffered frames for it\n",
 953                        rx->dev->name, print_mac(mac, rx->sta->addr));
 954 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 955
 956         }
 957
 958         /* Free PS Poll skb here instead of returning TXRX_DROP that would
 959          * count as an dropped frame. */
 960         dev_kfree_skb(rx->skb);
 961
 962         return TXRX_QUEUED;
 963 }
 964
 965 static ieee80211_txrx_result
 966 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 967 {
 968         u16 fc = rx->fc;
 969         u8 *data = rx->skb->data;
 970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 971
 972         if (!WLAN_FC_IS_QOS_DATA(fc))
 973                 return TXRX_CONTINUE;
 974
 975         /* remove the qos control field, update frame type and meta-data */
 976         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
 977         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
 978         /* change frame type to non QOS */
 979         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 980         hdr->frame_control = cpu_to_le16(fc);
 981
 982         return TXRX_CONTINUE;
 983 }
 984
 985 static int
 986 ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen)
 987 {
 988         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) &&
 989             rx->sdata->type != IEEE80211_IF_TYPE_STA &&
 990             (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
 991                 return 0;
 992
 993         if (unlikely(rx->sdata->ieee802_1x &&
 994                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 995                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
 996                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
 997                      !ieee80211_is_eapol(rx->skb, hdrlen))) {
 998 #ifdef CONFIG_MAC80211_DEBUG
 999                 printk(KERN_DEBUG "%s: dropped frame "
1000                        "(unauthorized port)\n", rx->dev->name);
1001 #endif /* CONFIG_MAC80211_DEBUG */
1002                 return -EACCES;
1003         }
1004
1005         return 0;
1006 }
1007
1008 static int
1009 ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen)
1010 {
1011         /*
1012          * Pass through unencrypted frames if the hardware has
1013          * decrypted them already.
1014          */
1015         if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
1016                 return 0;
1017
1018         /* Drop unencrypted frames if key is set. */
1019         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1020                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1021                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1022                      (rx->key || rx->sdata->drop_unencrypted) &&
1023                      (rx->sdata->eapol == 0 ||
1024                       !ieee80211_is_eapol(rx->skb, hdrlen)))) {
1025                 if (net_ratelimit())
1026                         printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1027                                "encryption\n", rx->dev->name);
1028                 return -EACCES;
1029         }
1030         return 0;
1031 }
1032
1033 static int
1034 ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1035 {
1036         struct net_device *dev = rx->dev;
1037         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1038         u16 fc, hdrlen, ethertype;
1039         u8 *payload;
1040         u8 dst[ETH_ALEN];
1041         u8 src[ETH_ALEN];
1042         struct sk_buff *skb = rx->skb;
1043         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1044         DECLARE_MAC_BUF(mac);
1045         DECLARE_MAC_BUF(mac2);
1046         DECLARE_MAC_BUF(mac3);
1047         DECLARE_MAC_BUF(mac4);
1048
1049         fc = rx->fc;
1050
1051         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1052                 return -1;
1053
1054         hdrlen = ieee80211_get_hdrlen(fc);
1055
1056         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1057          * header
1058          * IEEE 802.11 address fields:
1059          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1060          *   0     0   DA    SA    BSSID n/a
1061          *   0     1   DA    BSSID SA    n/a
1062          *   1     0   BSSID SA    DA    n/a
1063          *   1     1   RA    TA    DA    SA
1064          */
1065
1066         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1067         case IEEE80211_FCTL_TODS:
1068                 /* BSSID SA DA */
1069                 memcpy(dst, hdr->addr3, ETH_ALEN);
1070                 memcpy(src, hdr->addr2, ETH_ALEN);
1071
1072                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1073                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1074                         if (net_ratelimit())
1075                                 printk(KERN_DEBUG "%s: dropped ToDS frame "
1076                                        "(BSSID=%s SA=%s DA=%s)\n",
1077                                        dev->name,
1078                                        print_mac(mac, hdr->addr1),
1079                                        print_mac(mac2, hdr->addr2),
1080                                        print_mac(mac3, hdr->addr3));
1081                         return -1;
1082                 }
1083                 break;
1084         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1085                 /* RA TA DA SA */
1086                 memcpy(dst, hdr->addr3, ETH_ALEN);
1087                 memcpy(src, hdr->addr4, ETH_ALEN);
1088
1089                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1090                         if (net_ratelimit())
1091                                 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1092                                        "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1093                                        rx->dev->name,
1094                                        print_mac(mac, hdr->addr1),
1095                                        print_mac(mac2, hdr->addr2),
1096                                        print_mac(mac3, hdr->addr3),
1097                                        print_mac(mac4, hdr->addr4));
1098                         return -1;
1099                 }
1100                 break;
1101         case IEEE80211_FCTL_FROMDS:
1102                 /* DA BSSID SA */
1103                 memcpy(dst, hdr->addr1, ETH_ALEN);
1104                 memcpy(src, hdr->addr3, ETH_ALEN);
1105
1106                 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1107                     (is_multicast_ether_addr(dst) &&
1108                      !compare_ether_addr(src, dev->dev_addr)))
1109                         return -1;
1110                 break;
1111         case 0:
1112                 /* DA SA BSSID */
1113                 memcpy(dst, hdr->addr1, ETH_ALEN);
1114                 memcpy(src, hdr->addr2, ETH_ALEN);
1115
1116                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1117                         if (net_ratelimit()) {
1118                                 printk(KERN_DEBUG "%s: dropped IBSS frame "
1119                                        "(DA=%s SA=%s BSSID=%s)\n",
1120                                        dev->name,
1121                                        print_mac(mac, hdr->addr1),
1122                                        print_mac(mac2, hdr->addr2),
1123                                        print_mac(mac3, hdr->addr3));
1124                         }
1125                         return -1;
1126                 }
1127                 break;
1128         }
1129
1130         if (unlikely(skb->len - hdrlen < 8)) {
1131                 if (net_ratelimit()) {
1132                         printk(KERN_DEBUG "%s: RX too short data frame "
1133                                "payload\n", dev->name);
1134                 }
1135                 return -1;
1136         }
1137
1138         payload = skb->data + hdrlen;
1139         ethertype = (payload[6] << 8) | payload[7];
1140
1141         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1142                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1143                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1144                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1145                  * replace EtherType */
1146                 skb_pull(skb, hdrlen + 6);
1147                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1148                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1149         } else {
1150                 struct ethhdr *ehdr;
1151                 __be16 len;
1152                 skb_pull(skb, hdrlen);
1153                 len = htons(skb->len);
1154                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1155                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1156                 memcpy(ehdr->h_source, src, ETH_ALEN);
1157                 ehdr->h_proto = len;
1158         }
1159         return 0;
1160 }
1161
1162 static void
1163 ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1164 {
1165         struct net_device *dev = rx->dev;
1166         struct ieee80211_local *local = rx->local;
1167         struct sk_buff *skb, *xmit_skb;
1168         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1169
1170         skb = rx->skb;
1171         xmit_skb = NULL;
1172
1173         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1174             || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1175             (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1176                 if (is_multicast_ether_addr(skb->data)) {
1177                         /* send multicast frames both to higher layers in
1178                          * local net stack and back to the wireless media */
1179                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1180                         if (!xmit_skb && net_ratelimit())
1181                                 printk(KERN_DEBUG "%s: failed to clone "
1182                                        "multicast frame\n", dev->name);
1183                 } else {
1184                         struct sta_info *dsta;
1185                         dsta = sta_info_get(local, skb->data);
1186                         if (dsta && !dsta->dev) {
1187                                 if (net_ratelimit())
1188                                         printk(KERN_DEBUG "Station with null "
1189                                                "dev structure!\n");
1190                         } else if (dsta && dsta->dev == dev) {
1191                                 /* Destination station is associated to this
1192                                  * AP, so send the frame directly to it and
1193                                  * do not pass the frame to local net stack.
1194                                  */
1195                                 xmit_skb = skb;
1196                                 skb = NULL;
1197                         }
1198                         if (dsta)
1199                                 sta_info_put(dsta);
1200                 }
1201         }
1202
1203         if (skb) {
1204                 /* deliver to local stack */
1205                 skb->protocol = eth_type_trans(skb, dev);
1206                 memset(skb->cb, 0, sizeof(skb->cb));
1207                 netif_rx(skb);
1208         }
1209
1210         if (xmit_skb) {
1211                 /* send to wireless media */
1212                 xmit_skb->protocol = htons(ETH_P_802_3);
1213                 skb_set_network_header(xmit_skb, 0);
1214                 skb_set_mac_header(xmit_skb, 0);
1215                 dev_queue_xmit(xmit_skb);
1216         }
1217 }
1218
1219 static ieee80211_txrx_result
1220 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
1221 {
1222         struct net_device *dev = rx->dev;
1223         struct ieee80211_local *local = rx->local;
1224         u16 fc, ethertype;
1225         u8 *payload;
1226         struct sk_buff *skb = rx->skb, *frame = NULL;
1227         const struct ethhdr *eth;
1228         int remaining, err;
1229         u8 dst[ETH_ALEN];
1230         u8 src[ETH_ALEN];
1231         DECLARE_MAC_BUF(mac);
1232
1233         fc = rx->fc;
1234         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1235                 return TXRX_CONTINUE;
1236
1237         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1238                 return TXRX_DROP;
1239
1240         if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
1241                 return TXRX_CONTINUE;
1242
1243         err = ieee80211_data_to_8023(rx);
1244         if (unlikely(err))
1245                 return TXRX_DROP;
1246
1247         skb->dev = dev;
1248
1249         dev->stats.rx_packets++;
1250         dev->stats.rx_bytes += skb->len;
1251
1252         /* skip the wrapping header */
1253         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1254         if (!eth)
1255                 return TXRX_DROP;
1256
1257         while (skb != frame) {
1258                 u8 padding;
1259                 __be16 len = eth->h_proto;
1260                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1261
1262                 remaining = skb->len;
1263                 memcpy(dst, eth->h_dest, ETH_ALEN);
1264                 memcpy(src, eth->h_source, ETH_ALEN);
1265
1266                 padding = ((4 - subframe_len) & 0x3);
1267                 /* the last MSDU has no padding */
1268                 if (subframe_len > remaining) {
1269                         printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
1270                         return TXRX_DROP;
1271                 }
1272
1273                 skb_pull(skb, sizeof(struct ethhdr));
1274                 /* if last subframe reuse skb */
1275                 if (remaining <= subframe_len + padding)
1276                         frame = skb;
1277                 else {
1278                         frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1279                                               subframe_len);
1280
1281                         if (frame == NULL)
1282                                 return TXRX_DROP;
1283
1284                         skb_reserve(frame, local->hw.extra_tx_headroom +
1285                                     sizeof(struct ethhdr));
1286                         memcpy(skb_put(frame, ntohs(len)), skb->data,
1287                                 ntohs(len));
1288
1289                         eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1290                                                         padding);
1291                         if (!eth) {
1292                                 printk(KERN_DEBUG "%s: wrong buffer size ",
1293                                        dev->name);
1294                                 dev_kfree_skb(frame);
1295                                 return TXRX_DROP;
1296                         }
1297                 }
1298
1299                 skb_set_network_header(frame, 0);
1300                 frame->dev = dev;
1301                 frame->priority = skb->priority;
1302                 rx->skb = frame;
1303
1304                 if ((ieee80211_drop_802_1x_pae(rx, 0)) ||
1305                     (ieee80211_drop_unencrypted(rx, 0))) {
1306                         if (skb == frame) /* last frame */
1307                                 return TXRX_DROP;
1308                         dev_kfree_skb(frame);
1309                         continue;
1310                 }
1311
1312                 payload = frame->data;
1313                 ethertype = (payload[6] << 8) | payload[7];
1314
1315                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1316                         ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1317                         compare_ether_addr(payload,
1318                                            bridge_tunnel_header) == 0)) {
1319                         /* remove RFC1042 or Bridge-Tunnel
1320                          * encapsulation and replace EtherType */
1321                         skb_pull(frame, 6);
1322                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1323                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1324                 } else {
1325                         memcpy(skb_push(frame, sizeof(__be16)), &len,
1326                                 sizeof(__be16));
1327                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1328                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1329                 }
1330
1331
1332                 ieee80211_deliver_skb(rx);
1333         }
1334
1335         return TXRX_QUEUED;
1336 }
1337
1338 static ieee80211_txrx_result
1339 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1340 {
1341         struct net_device *dev = rx->dev;
1342         u16 fc;
1343         int err, hdrlen;
1344
1345         fc = rx->fc;
1346         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1347                 return TXRX_CONTINUE;
1348
1349         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1350                 return TXRX_DROP;
1351
1352         hdrlen = ieee80211_get_hdrlen(fc);
1353
1354         if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) ||
1355             (ieee80211_drop_unencrypted(rx, hdrlen)))
1356                 return TXRX_DROP;
1357
1358         err = ieee80211_data_to_8023(rx);
1359         if (unlikely(err))
1360                 return TXRX_DROP;
1361
1362         rx->skb->dev = dev;
1363
1364         dev->stats.rx_packets++;
1365         dev->stats.rx_bytes += rx->skb->len;
1366
1367         ieee80211_deliver_skb(rx);
1368
1369         return TXRX_QUEUED;
1370 }
1371
1372 static ieee80211_txrx_result
1373 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1374 {
1375         struct ieee80211_sub_if_data *sdata;
1376
1377         if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1378                 return TXRX_DROP;
1379
1380         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1381         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1382              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1383             !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1384                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1385         else
1386                 return TXRX_DROP;
1387
1388         return TXRX_QUEUED;
1389 }
1390
1391 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1392                                 struct ieee80211_local *local,
1393                                 ieee80211_rx_handler *handlers,
1394                                 struct ieee80211_txrx_data *rx,
1395                                 struct sta_info *sta)
1396 {
1397         ieee80211_rx_handler *handler;
1398         ieee80211_txrx_result res = TXRX_DROP;
1399
1400         for (handler = handlers; *handler != NULL; handler++) {
1401                 res = (*handler)(rx);
1402
1403                 switch (res) {
1404                 case TXRX_CONTINUE:
1405                         continue;
1406                 case TXRX_DROP:
1407                         I802_DEBUG_INC(local->rx_handlers_drop);
1408                         if (sta)
1409                                 sta->rx_dropped++;
1410                         break;
1411                 case TXRX_QUEUED:
1412                         I802_DEBUG_INC(local->rx_handlers_queued);
1413                         break;
1414                 }
1415                 break;
1416         }
1417
1418         if (res == TXRX_DROP)
1419                 dev_kfree_skb(rx->skb);
1420         return res;
1421 }
1422
1423 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1424                                                 ieee80211_rx_handler *handlers,
1425                                                 struct ieee80211_txrx_data *rx,
1426                                                 struct sta_info *sta)
1427 {
1428         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1429             TXRX_CONTINUE)
1430                 dev_kfree_skb(rx->skb);
1431 }
1432
1433 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1434                                             struct ieee80211_hdr *hdr,
1435                                             struct sta_info *sta,
1436                                             struct ieee80211_txrx_data *rx)
1437 {
1438         int keyidx, hdrlen;
1439         DECLARE_MAC_BUF(mac);
1440         DECLARE_MAC_BUF(mac2);
1441
1442         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1443         if (rx->skb->len >= hdrlen + 4)
1444                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1445         else
1446                 keyidx = -1;
1447
1448         if (net_ratelimit())
1449                 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1450                        "failure from %s to %s keyidx=%d\n",
1451                        dev->name, print_mac(mac, hdr->addr2),
1452                        print_mac(mac2, hdr->addr1), keyidx);
1453
1454         if (!sta) {
1455                 /*
1456                  * Some hardware seem to generate incorrect Michael MIC
1457                  * reports; ignore them to avoid triggering countermeasures.
1458                  */
1459                 if (net_ratelimit())
1460                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1461                                "error for unknown address %s\n",
1462                                dev->name, print_mac(mac, hdr->addr2));
1463                 goto ignore;
1464         }
1465
1466         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1467                 if (net_ratelimit())
1468                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1469                                "error for a frame with no PROTECTED flag (src "
1470                                "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1471                 goto ignore;
1472         }
1473
1474         if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1475                 /*
1476                  * APs with pairwise keys should never receive Michael MIC
1477                  * errors for non-zero keyidx because these are reserved for
1478                  * group keys and only the AP is sending real multicast
1479                  * frames in the BSS.
1480                  */
1481                 if (net_ratelimit())
1482                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1483                                "a frame with non-zero keyidx (%d)"
1484                                " (src %s)\n", dev->name, keyidx,
1485                                print_mac(mac, hdr->addr2));
1486                 goto ignore;
1487         }
1488
1489         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1490             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1491              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1492                 if (net_ratelimit())
1493                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1494                                "error for a frame that cannot be encrypted "
1495                                "(fc=0x%04x) (src %s)\n",
1496                                dev->name, rx->fc, print_mac(mac, hdr->addr2));
1497                 goto ignore;
1498         }
1499
1500         mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1501  ignore:
1502         dev_kfree_skb(rx->skb);
1503         rx->skb = NULL;
1504 }
1505
1506 ieee80211_rx_handler ieee80211_rx_handlers[] =
1507 {
1508         ieee80211_rx_h_if_stats,
1509         ieee80211_rx_h_passive_scan,
1510         ieee80211_rx_h_check,
1511         ieee80211_rx_h_decrypt,
1512         ieee80211_rx_h_sta_process,
1513         ieee80211_rx_h_defragment,
1514         ieee80211_rx_h_ps_poll,
1515         ieee80211_rx_h_michael_mic_verify,
1516         /* this must be after decryption - so header is counted in MPDU mic
1517          * must be before pae and data, so QOS_DATA format frames
1518          * are not passed to user space by these functions
1519          */
1520         ieee80211_rx_h_remove_qos_control,
1521         ieee80211_rx_h_amsdu,
1522         ieee80211_rx_h_data,
1523         ieee80211_rx_h_mgmt,
1524         NULL
1525 };
1526
1527 /* main receive path */
1528
1529 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1530                                 u8 *bssid, struct ieee80211_txrx_data *rx,
1531                                 struct ieee80211_hdr *hdr)
1532 {
1533         int multicast = is_multicast_ether_addr(hdr->addr1);
1534
1535         switch (sdata->type) {
1536         case IEEE80211_IF_TYPE_STA:
1537                 if (!bssid)
1538                         return 0;
1539                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1540                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1541                                 return 0;
1542                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1543                 } else if (!multicast &&
1544                            compare_ether_addr(sdata->dev->dev_addr,
1545                                               hdr->addr1) != 0) {
1546                         if (!(sdata->dev->flags & IFF_PROMISC))
1547                                 return 0;
1548                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1549                 }
1550                 break;
1551         case IEEE80211_IF_TYPE_IBSS:
1552                 if (!bssid)
1553                         return 0;
1554                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1555                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1556                                 return 0;
1557                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1558                 } else if (!multicast &&
1559                            compare_ether_addr(sdata->dev->dev_addr,
1560                                               hdr->addr1) != 0) {
1561                         if (!(sdata->dev->flags & IFF_PROMISC))
1562                                 return 0;
1563                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1564                 } else if (!rx->sta)
1565                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1566                                                          bssid, hdr->addr2);
1567                 break;
1568         case IEEE80211_IF_TYPE_VLAN:
1569         case IEEE80211_IF_TYPE_AP:
1570                 if (!bssid) {
1571                         if (compare_ether_addr(sdata->dev->dev_addr,
1572                                                hdr->addr1))
1573                                 return 0;
1574                 } else if (!ieee80211_bssid_match(bssid,
1575                                         sdata->dev->dev_addr)) {
1576                         if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1577                                 return 0;
1578                         rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1579                 }
1580                 if (sdata->dev == sdata->local->mdev &&
1581                     !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1582                         /* do not receive anything via
1583                          * master device when not scanning */
1584                         return 0;
1585                 break;
1586         case IEEE80211_IF_TYPE_WDS:
1587                 if (bssid ||
1588                     (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1589                         return 0;
1590                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1591                         return 0;
1592                 break;
1593         case IEEE80211_IF_TYPE_MNTR:
1594                 /* take everything */
1595                 break;
1596         case IEEE80211_IF_TYPE_INVALID:
1597                 /* should never get here */
1598                 WARN_ON(1);
1599                 break;
1600         }
1601
1602         return 1;
1603 }
1604
1605 /*
1606  * This is the receive path handler. It is called by a low level driver when an
1607  * 802.11 MPDU is received from the hardware.
1608  */
1609 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1610                     struct ieee80211_rx_status *status)
1611 {
1612         struct ieee80211_local *local = hw_to_local(hw);
1613         struct ieee80211_sub_if_data *sdata;
1614         struct sta_info *sta;
1615         struct ieee80211_hdr *hdr;
1616         struct ieee80211_txrx_data rx;
1617         u16 type;
1618         int prepres;
1619         struct ieee80211_sub_if_data *prev = NULL;
1620         struct sk_buff *skb_new;
1621         u8 *bssid;
1622         int hdrlen;
1623
1624         /*
1625          * key references and virtual interfaces are protected using RCU
1626          * and this requires that we are in a read-side RCU section during
1627          * receive processing
1628          */
1629         rcu_read_lock();
1630
1631         /*
1632          * Frames with failed FCS/PLCP checksum are not returned,
1633          * all other frames are returned without radiotap header
1634          * if it was previously present.
1635          * Also, frames with less than 16 bytes are dropped.
1636          */
1637         skb = ieee80211_rx_monitor(local, skb, status);
1638         if (!skb) {
1639                 rcu_read_unlock();
1640                 return;
1641         }
1642
1643         hdr = (struct ieee80211_hdr *) skb->data;
1644         memset(&rx, 0, sizeof(rx));
1645         rx.skb = skb;
1646         rx.local = local;
1647
1648         rx.u.rx.status = status;
1649         rx.fc = le16_to_cpu(hdr->frame_control);
1650         type = rx.fc & IEEE80211_FCTL_FTYPE;
1651
1652         /*
1653          * Drivers are required to align the payload data to a four-byte
1654          * boundary, so the last two bits of the address where it starts
1655          * may not be set. The header is required to be directly before
1656          * the payload data, padding like atheros hardware adds which is
1657          * inbetween the 802.11 header and the payload is not supported,
1658          * the driver is required to move the 802.11 header further back
1659          * in that case.
1660          */
1661         hdrlen = ieee80211_get_hdrlen(rx.fc);
1662         WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
1663
1664         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1665                 local->dot11ReceivedFragmentCount++;
1666
1667         sta = rx.sta = sta_info_get(local, hdr->addr2);
1668         if (sta) {
1669                 rx.dev = rx.sta->dev;
1670                 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1671         }
1672
1673         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1674                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1675                 goto end;
1676         }
1677
1678         if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1679                 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1680
1681         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1682                                            sta) != TXRX_CONTINUE)
1683                 goto end;
1684         skb = rx.skb;
1685
1686         if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1687             !atomic_read(&local->iff_promiscs) &&
1688             !is_multicast_ether_addr(hdr->addr1)) {
1689                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1690                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1691                                              rx.sta);
1692                 sta_info_put(sta);
1693                 rcu_read_unlock();
1694                 return;
1695         }
1696
1697         bssid = ieee80211_get_bssid(hdr, skb->len);
1698
1699         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1700                 if (!netif_running(sdata->dev))
1701                         continue;
1702
1703                 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1704                         continue;
1705
1706                 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1707                 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1708                 /* prepare_for_handlers can change sta */
1709                 sta = rx.sta;
1710
1711                 if (!prepres)
1712                         continue;
1713
1714                 /*
1715                  * frame is destined for this interface, but if it's not
1716                  * also for the previous one we handle that after the
1717                  * loop to avoid copying the SKB once too much
1718                  */
1719
1720                 if (!prev) {
1721                         prev = sdata;
1722                         continue;
1723                 }
1724
1725                 /*
1726                  * frame was destined for the previous interface
1727                  * so invoke RX handlers for it
1728                  */
1729
1730                 skb_new = skb_copy(skb, GFP_ATOMIC);
1731                 if (!skb_new) {
1732                         if (net_ratelimit())
1733                                 printk(KERN_DEBUG "%s: failed to copy "
1734                                        "multicast frame for %s",
1735                                        wiphy_name(local->hw.wiphy),
1736                                        prev->dev->name);
1737                         continue;
1738                 }
1739                 rx.skb = skb_new;
1740                 rx.dev = prev->dev;
1741                 rx.sdata = prev;
1742                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1743                                              &rx, sta);
1744                 prev = sdata;
1745         }
1746         if (prev) {
1747                 rx.skb = skb;
1748                 rx.dev = prev->dev;
1749                 rx.sdata = prev;
1750                 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1751                                              &rx, sta);
1752         } else
1753                 dev_kfree_skb(skb);
1754
1755  end:
1756         rcu_read_unlock();
1757
1758         if (sta)
1759                 sta_info_put(sta);
1760 }
1761 EXPORT_SYMBOL(__ieee80211_rx);
1762
1763 /* This is a version of the rx handler that can be called from hard irq
1764  * context. Post the skb on the queue and schedule the tasklet */
1765 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1766                           struct ieee80211_rx_status *status)
1767 {
1768         struct ieee80211_local *local = hw_to_local(hw);
1769
1770         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1771
1772         skb->dev = local->mdev;
1773         /* copy status into skb->cb for use by tasklet */
1774         memcpy(skb->cb, status, sizeof(*status));
1775         skb->pkt_type = IEEE80211_RX_MSG;
1776         skb_queue_tail(&local->skb_queue, skb);
1777         tasklet_schedule(&local->tasklet);
1778 }
1779 EXPORT_SYMBOL(ieee80211_rx_irqsafe);