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 2007-2010  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/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "led.h"
  25 #include "mesh.h"
  26 #include "wep.h"
  27 #include "wpa.h"
  28 #include "tkip.h"
  29 #include "wme.h"
  30
  31 /*
  32  * monitor mode reception
  33  *
  34  * This function cleans up the SKB, i.e. it removes all the stuff
  35  * only useful for monitoring.
  36  */
  37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  38                                            struct sk_buff *skb)
  39 {
  40         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  41                 if (likely(skb->len > FCS_LEN))
  42                         __pskb_trim(skb, skb->len - FCS_LEN);
  43                 else {
  44                         /* driver bug */
  45                         WARN_ON(1);
  46                         dev_kfree_skb(skb);
  47                         skb = NULL;
  48                 }
  49         }
  50
  51         return skb;
  52 }
  53
  54 static inline int should_drop_frame(struct sk_buff *skb,
  55                                     int present_fcs_len)
  56 {
  57         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  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))
  63                 return 1;
  64         if (ieee80211_is_ctl(hdr->frame_control) &&
  65             !ieee80211_is_pspoll(hdr->frame_control) &&
  66             !ieee80211_is_back_req(hdr->frame_control))
  67                 return 1;
  68         return 0;
  69 }
  70
  71 static int
  72 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
  73                           struct ieee80211_rx_status *status)
  74 {
  75         int len;
  76
  77         /* always present fields */
  78         len = sizeof(struct ieee80211_radiotap_header) + 9;
  79
  80         if (status->flag & RX_FLAG_TSFT)
  81                 len += 8;
  82         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  83                 len += 1;
  84
  85         if (len & 1) /* padding for RX_FLAGS if necessary */
  86                 len++;
  87
  88         return len;
  89 }
  90
  91 /*
  92  * ieee80211_add_rx_radiotap_header - add radiotap header
  93  *
  94  * add a radiotap header containing all the fields which the hardware provided.
  95  */
  96 static void
  97 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
  98                                  struct sk_buff *skb,
  99                                  struct ieee80211_rate *rate,
 100                                  int rtap_len)
 101 {
 102         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 103         struct ieee80211_radiotap_header *rthdr;
 104         unsigned char *pos;
 105         u16 rx_flags = 0;
 106
 107         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 108         memset(rthdr, 0, rtap_len);
 109
 110         /* radiotap header, set always present flags */
 111         rthdr->it_present =
 112                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 113                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 114                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
 115                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 116         rthdr->it_len = cpu_to_le16(rtap_len);
 117
 118         pos = (unsigned char *)(rthdr+1);
 119
 120         /* the order of the following fields is important */
 121
 122         /* IEEE80211_RADIOTAP_TSFT */
 123         if (status->flag & RX_FLAG_TSFT) {
 124                 put_unaligned_le64(status->mactime, pos);
 125                 rthdr->it_present |=
 126                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 127                 pos += 8;
 128         }
 129
 130         /* IEEE80211_RADIOTAP_FLAGS */
 131         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 132                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 133         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 134                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 135         if (status->flag & RX_FLAG_SHORTPRE)
 136                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 137         pos++;
 138
 139         /* IEEE80211_RADIOTAP_RATE */
 140         if (status->flag & RX_FLAG_HT) {
 141                 /*
 142                  * TODO: add following information into radiotap header once
 143                  * suitable fields are defined for it:
 144                  * - MCS index (status->rate_idx)
 145                  * - HT40 (status->flag & RX_FLAG_40MHZ)
 146                  * - short-GI (status->flag & RX_FLAG_SHORT_GI)
 147                  */
 148                 *pos = 0;
 149         } else {
 150                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 151                 *pos = rate->bitrate / 5;
 152         }
 153         pos++;
 154
 155         /* IEEE80211_RADIOTAP_CHANNEL */
 156         put_unaligned_le16(status->freq, pos);
 157         pos += 2;
 158         if (status->band == IEEE80211_BAND_5GHZ)
 159                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 160                                    pos);
 161         else if (status->flag & RX_FLAG_HT)
 162                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
 163                                    pos);
 164         else if (rate->flags & IEEE80211_RATE_ERP_G)
 165                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 166                                    pos);
 167         else
 168                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 169                                    pos);
 170         pos += 2;
 171
 172         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 173         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
 174                 *pos = status->signal;
 175                 rthdr->it_present |=
 176                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 177                 pos++;
 178         }
 179
 180         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 181
 182         /* IEEE80211_RADIOTAP_ANTENNA */
 183         *pos = status->antenna;
 184         pos++;
 185
 186         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 187
 188         /* IEEE80211_RADIOTAP_RX_FLAGS */
 189         /* ensure 2 byte alignment for the 2 byte field as required */
 190         if ((pos - (u8 *)rthdr) & 1)
 191                 pos++;
 192         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 193                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 194         put_unaligned_le16(rx_flags, pos);
 195         pos += 2;
 196 }
 197
 198 /*
 199  * This function copies a received frame to all monitor interfaces and
 200  * returns a cleaned-up SKB that no longer includes the FCS nor the
 201  * radiotap header the driver might have added.
 202  */
 203 static struct sk_buff *
 204 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 205                      struct ieee80211_rate *rate)
 206 {
 207         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 208         struct ieee80211_sub_if_data *sdata;
 209         int needed_headroom = 0;
 210         struct sk_buff *skb, *skb2;
 211         struct net_device *prev_dev = NULL;
 212         int present_fcs_len = 0;
 213
 214         /*
 215          * First, we may need to make a copy of the skb because
 216          *  (1) we need to modify it for radiotap (if not present), and
 217          *  (2) the other RX handlers will modify the skb we got.
 218          *
 219          * We don't need to, of course, if we aren't going to return
 220          * the SKB because it has a bad FCS/PLCP checksum.
 221          */
 222
 223         /* room for the radiotap header based on driver features */
 224         needed_headroom = ieee80211_rx_radiotap_len(local, status);
 225
 226         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 227                 present_fcs_len = FCS_LEN;
 228
 229         /* make sure hdr->frame_control is on the linear part */
 230         if (!pskb_may_pull(origskb, 2)) {
 231                 dev_kfree_skb(origskb);
 232                 return NULL;
 233         }
 234
 235         if (!local->monitors) {
 236                 if (should_drop_frame(origskb, present_fcs_len)) {
 237                         dev_kfree_skb(origskb);
 238                         return NULL;
 239                 }
 240
 241                 return remove_monitor_info(local, origskb);
 242         }
 243
 244         if (should_drop_frame(origskb, present_fcs_len)) {
 245                 /* only need to expand headroom if necessary */
 246                 skb = origskb;
 247                 origskb = NULL;
 248
 249                 /*
 250                  * This shouldn't trigger often because most devices have an
 251                  * RX header they pull before we get here, and that should
 252                  * be big enough for our radiotap information. We should
 253                  * probably export the length to drivers so that we can have
 254                  * them allocate enough headroom to start with.
 255                  */
 256                 if (skb_headroom(skb) < needed_headroom &&
 257                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 258                         dev_kfree_skb(skb);
 259                         return NULL;
 260                 }
 261         } else {
 262                 /*
 263                  * Need to make a copy and possibly remove radiotap header
 264                  * and FCS from the original.
 265                  */
 266                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 267
 268                 origskb = remove_monitor_info(local, origskb);
 269
 270                 if (!skb)
 271                         return origskb;
 272         }
 273
 274         /* prepend radiotap information */
 275         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
 276
 277         skb_reset_mac_header(skb);
 278         skb->ip_summed = CHECKSUM_UNNECESSARY;
 279         skb->pkt_type = PACKET_OTHERHOST;
 280         skb->protocol = htons(ETH_P_802_2);
 281
 282         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 283                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 284                         continue;
 285
 286                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 287                         continue;
 288
 289                 if (!ieee80211_sdata_running(sdata))
 290                         continue;
 291
 292                 if (prev_dev) {
 293                         skb2 = skb_clone(skb, GFP_ATOMIC);
 294                         if (skb2) {
 295                                 skb2->dev = prev_dev;
 296                                 netif_receive_skb(skb2);
 297                         }
 298                 }
 299
 300                 prev_dev = sdata->dev;
 301                 sdata->dev->stats.rx_packets++;
 302                 sdata->dev->stats.rx_bytes += skb->len;
 303         }
 304
 305         if (prev_dev) {
 306                 skb->dev = prev_dev;
 307                 netif_receive_skb(skb);
 308         } else
 309                 dev_kfree_skb(skb);
 310
 311         return origskb;
 312 }
 313
 314
 315 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 316 {
 317         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 318         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 319         int tid;
 320
 321         /* does the frame have a qos control field? */
 322         if (ieee80211_is_data_qos(hdr->frame_control)) {
 323                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 324                 /* frame has qos control */
 325                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 326                 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
 327                         status->rx_flags |= IEEE80211_RX_AMSDU;
 328         } else {
 329                 /*
 330                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 331                  *
 332                  *      Sequence numbers for management frames, QoS data
 333                  *      frames with a broadcast/multicast address in the
 334                  *      Address 1 field, and all non-QoS data frames sent
 335                  *      by QoS STAs are assigned using an additional single
 336                  *      modulo-4096 counter, [...]
 337                  *
 338                  * We also use that counter for non-QoS STAs.
 339                  */
 340                 tid = NUM_RX_DATA_QUEUES - 1;
 341         }
 342
 343         rx->queue = tid;
 344         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 345          * For now, set skb->priority to 0 for other cases. */
 346         rx->skb->priority = (tid > 7) ? 0 : tid;
 347 }
 348
 349 /**
 350  * DOC: Packet alignment
 351  *
 352  * Drivers always need to pass packets that are aligned to two-byte boundaries
 353  * to the stack.
 354  *
 355  * Additionally, should, if possible, align the payload data in a way that
 356  * guarantees that the contained IP header is aligned to a four-byte
 357  * boundary. In the case of regular frames, this simply means aligning the
 358  * payload to a four-byte boundary (because either the IP header is directly
 359  * contained, or IV/RFC1042 headers that have a length divisible by four are
 360  * in front of it).  If the payload data is not properly aligned and the
 361  * architecture doesn't support efficient unaligned operations, mac80211
 362  * will align the data.
 363  *
 364  * With A-MSDU frames, however, the payload data address must yield two modulo
 365  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 366  * push the IP header further back to a multiple of four again. Thankfully, the
 367  * specs were sane enough this time around to require padding each A-MSDU
 368  * subframe to a length that is a multiple of four.
 369  *
 370  * Padding like Atheros hardware adds which is inbetween the 802.11 header and
 371  * the payload is not supported, the driver is required to move the 802.11
 372  * header to be directly in front of the payload in that case.
 373  */
 374 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 375 {
 376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 377         WARN_ONCE((unsigned long)rx->skb->data & 1,
 378                   "unaligned packet at 0x%p\n", rx->skb->data);
 379 #endif
 380 }
 381
 382
 383 /* rx handlers */
 384
 385 static ieee80211_rx_result debug_noinline
 386 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
 387 {
 388         struct ieee80211_local *local = rx->local;
 389         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 390         struct sk_buff *skb = rx->skb;
 391
 392         if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
 393                 return RX_CONTINUE;
 394
 395         if (test_bit(SCAN_HW_SCANNING, &local->scanning))
 396                 return ieee80211_scan_rx(rx->sdata, skb);
 397
 398         if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 399                 /* drop all the other packets during a software scan anyway */
 400                 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
 401                         dev_kfree_skb(skb);
 402                 return RX_QUEUED;
 403         }
 404
 405         /* scanning finished during invoking of handlers */
 406         I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 407         return RX_DROP_UNUSABLE;
 408 }
 409
 410
 411 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 412 {
 413         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 414
 415         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 416                 return 0;
 417
 418         return ieee80211_is_robust_mgmt_frame(hdr);
 419 }
 420
 421
 422 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 423 {
 424         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 425
 426         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 427                 return 0;
 428
 429         return ieee80211_is_robust_mgmt_frame(hdr);
 430 }
 431
 432
 433 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 434 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 435 {
 436         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 437         struct ieee80211_mmie *mmie;
 438
 439         if (skb->len < 24 + sizeof(*mmie) ||
 440             !is_multicast_ether_addr(hdr->da))
 441                 return -1;
 442
 443         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 444                 return -1; /* not a robust management frame */
 445
 446         mmie = (struct ieee80211_mmie *)
 447                 (skb->data + skb->len - sizeof(*mmie));
 448         if (mmie->element_id != WLAN_EID_MMIE ||
 449             mmie->length != sizeof(*mmie) - 2)
 450                 return -1;
 451
 452         return le16_to_cpu(mmie->key_id);
 453 }
 454
 455
 456 static ieee80211_rx_result
 457 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 458 {
 459         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 460         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 461         char *dev_addr = rx->sdata->vif.addr;
 462
 463         if (ieee80211_is_data(hdr->frame_control)) {
 464                 if (is_multicast_ether_addr(hdr->addr1)) {
 465                         if (ieee80211_has_tods(hdr->frame_control) ||
 466                                 !ieee80211_has_fromds(hdr->frame_control))
 467                                 return RX_DROP_MONITOR;
 468                         if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
 469                                 return RX_DROP_MONITOR;
 470                 } else {
 471                         if (!ieee80211_has_a4(hdr->frame_control))
 472                                 return RX_DROP_MONITOR;
 473                         if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
 474                                 return RX_DROP_MONITOR;
 475                 }
 476         }
 477
 478         /* If there is not an established peer link and this is not a peer link
 479          * establisment frame, beacon or probe, drop the frame.
 480          */
 481
 482         if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
 483                 struct ieee80211_mgmt *mgmt;
 484
 485                 if (!ieee80211_is_mgmt(hdr->frame_control))
 486                         return RX_DROP_MONITOR;
 487
 488                 if (ieee80211_is_action(hdr->frame_control)) {
 489                         mgmt = (struct ieee80211_mgmt *)hdr;
 490                         if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
 491                                 return RX_DROP_MONITOR;
 492                         return RX_CONTINUE;
 493                 }
 494
 495                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 496                     ieee80211_is_probe_resp(hdr->frame_control) ||
 497                     ieee80211_is_beacon(hdr->frame_control))
 498                         return RX_CONTINUE;
 499
 500                 return RX_DROP_MONITOR;
 501
 502         }
 503
 504 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
 505
 506         if (ieee80211_is_data(hdr->frame_control) &&
 507             is_multicast_ether_addr(hdr->addr1) &&
 508             mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
 509                 return RX_DROP_MONITOR;
 510 #undef msh_h_get
 511
 512         return RX_CONTINUE;
 513 }
 514
 515 #define SEQ_MODULO 0x1000
 516 #define SEQ_MASK   0xfff
 517
 518 static inline int seq_less(u16 sq1, u16 sq2)
 519 {
 520         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
 521 }
 522
 523 static inline u16 seq_inc(u16 sq)
 524 {
 525         return (sq + 1) & SEQ_MASK;
 526 }
 527
 528 static inline u16 seq_sub(u16 sq1, u16 sq2)
 529 {
 530         return (sq1 - sq2) & SEQ_MASK;
 531 }
 532
 533
 534 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
 535                                             struct tid_ampdu_rx *tid_agg_rx,
 536                                             int index,
 537                                             struct sk_buff_head *frames)
 538 {
 539         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 540
 541         if (!skb)
 542                 goto no_frame;
 543
 544         /* release the frame from the reorder ring buffer */
 545         tid_agg_rx->stored_mpdu_num--;
 546         tid_agg_rx->reorder_buf[index] = NULL;
 547         __skb_queue_tail(frames, skb);
 548
 549 no_frame:
 550         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 551 }
 552
 553 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
 554                                              struct tid_ampdu_rx *tid_agg_rx,
 555                                              u16 head_seq_num,
 556                                              struct sk_buff_head *frames)
 557 {
 558         int index;
 559
 560         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 561                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 562                                                         tid_agg_rx->buf_size;
 563                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
 564         }
 565 }
 566
 567 /*
 568  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 569  * the skb was added to the buffer longer than this time ago, the earlier
 570  * frames that have not yet been received are assumed to be lost and the skb
 571  * can be released for processing. This may also release other skb's from the
 572  * reorder buffer if there are no additional gaps between the frames.
 573  *
 574  * Callers must hold tid_agg_rx->reorder_lock.
 575  */
 576 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 577
 578 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
 579                                           struct tid_ampdu_rx *tid_agg_rx,
 580                                           struct sk_buff_head *frames)
 581 {
 582         int index, j;
 583
 584         /* release the buffer until next missing frame */
 585         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 586                                                 tid_agg_rx->buf_size;
 587         if (!tid_agg_rx->reorder_buf[index] &&
 588             tid_agg_rx->stored_mpdu_num > 1) {
 589                 /*
 590                  * No buffers ready to be released, but check whether any
 591                  * frames in the reorder buffer have timed out.
 592                  */
 593                 int skipped = 1;
 594                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 595                      j = (j + 1) % tid_agg_rx->buf_size) {
 596                         if (!tid_agg_rx->reorder_buf[j]) {
 597                                 skipped++;
 598                                 continue;
 599                         }
 600                         if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
 601                                         HT_RX_REORDER_BUF_TIMEOUT))
 602                                 goto set_release_timer;
 603
 604 #ifdef CONFIG_MAC80211_HT_DEBUG
 605                         if (net_ratelimit())
 606                                 wiphy_debug(hw->wiphy,
 607                                             "release an RX reorder frame due to timeout on earlier frames\n");
 608 #endif
 609                         ieee80211_release_reorder_frame(hw, tid_agg_rx,
 610                                                         j, frames);
 611
 612                         /*
 613                          * Increment the head seq# also for the skipped slots.
 614                          */
 615                         tid_agg_rx->head_seq_num =
 616                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
 617                         skipped = 0;
 618                 }
 619         } else while (tid_agg_rx->reorder_buf[index]) {
 620                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
 621                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 622                                                         tid_agg_rx->buf_size;
 623         }
 624
 625         /*
 626          * Disable the reorder release timer for now.
 627          *
 628          * The current implementation lacks a proper locking scheme
 629          * which would protect vital statistic and debug counters
 630          * from being updated by two different but concurrent BHs.
 631          *
 632          * More information about the topic is available from:
 633          * - thread: http://marc.info/?t=128635927000001
 634          *
 635          * What was wrong:
 636          * =>  http://marc.info/?l=linux-wireless&m=128636170811964
 637          * "Basically the thing is that until your patch, the data
 638          *  in the struct didn't actually need locking because it
 639          *  was accessed by the RX path only which is not concurrent."
 640          *
 641          * List of what needs to be fixed:
 642          * => http://marc.info/?l=linux-wireless&m=128656352920957
 643          *
 644
 645         if (tid_agg_rx->stored_mpdu_num) {
 646                 j = index = seq_sub(tid_agg_rx->head_seq_num,
 647                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 648
 649                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 650                      j = (j + 1) % tid_agg_rx->buf_size) {
 651                         if (tid_agg_rx->reorder_buf[j])
 652                                 break;
 653                 }
 654
 655  set_release_timer:
 656
 657                 mod_timer(&tid_agg_rx->reorder_timer,
 658                           tid_agg_rx->reorder_time[j] +
 659                           HT_RX_REORDER_BUF_TIMEOUT);
 660         } else {
 661                 del_timer(&tid_agg_rx->reorder_timer);
 662         }
 663         */
 664
 665 set_release_timer:
 666         return;
 667 }
 668
 669 /*
 670  * As this function belongs to the RX path it must be under
 671  * rcu_read_lock protection. It returns false if the frame
 672  * can be processed immediately, true if it was consumed.
 673  */
 674 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 675                                              struct tid_ampdu_rx *tid_agg_rx,
 676                                              struct sk_buff *skb,
 677                                              struct sk_buff_head *frames)
 678 {
 679         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 680         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 681         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 682         u16 head_seq_num, buf_size;
 683         int index;
 684         bool ret = true;
 685
 686         buf_size = tid_agg_rx->buf_size;
 687         head_seq_num = tid_agg_rx->head_seq_num;
 688
 689         spin_lock(&tid_agg_rx->reorder_lock);
 690         /* frame with out of date sequence number */
 691         if (seq_less(mpdu_seq_num, head_seq_num)) {
 692                 dev_kfree_skb(skb);
 693                 goto out;
 694         }
 695
 696         /*
 697          * If frame the sequence number exceeds our buffering window
 698          * size release some previous frames to make room for this one.
 699          */
 700         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
 701                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
 702                 /* release stored frames up to new head to stack */
 703                 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
 704                                                  frames);
 705         }
 706
 707         /* Now the new frame is always in the range of the reordering buffer */
 708
 709         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 710
 711         /* check if we already stored this frame */
 712         if (tid_agg_rx->reorder_buf[index]) {
 713                 dev_kfree_skb(skb);
 714                 goto out;
 715         }
 716
 717         /*
 718          * If the current MPDU is in the right order and nothing else
 719          * is stored we can process it directly, no need to buffer it.
 720          */
 721         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 722             tid_agg_rx->stored_mpdu_num == 0) {
 723                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 724                 ret = false;
 725                 goto out;
 726         }
 727
 728         /* put the frame in the reordering buffer */
 729         tid_agg_rx->reorder_buf[index] = skb;
 730         tid_agg_rx->reorder_time[index] = jiffies;
 731         tid_agg_rx->stored_mpdu_num++;
 732         ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
 733
 734  out:
 735         spin_unlock(&tid_agg_rx->reorder_lock);
 736         return ret;
 737 }
 738
 739 /*
 740  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 741  * true if the MPDU was buffered, false if it should be processed.
 742  */
 743 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 744                                        struct sk_buff_head *frames)
 745 {
 746         struct sk_buff *skb = rx->skb;
 747         struct ieee80211_local *local = rx->local;
 748         struct ieee80211_hw *hw = &local->hw;
 749         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 750         struct sta_info *sta = rx->sta;
 751         struct tid_ampdu_rx *tid_agg_rx;
 752         u16 sc;
 753         int tid;
 754
 755         if (!ieee80211_is_data_qos(hdr->frame_control))
 756                 goto dont_reorder;
 757
 758         /*
 759          * filter the QoS data rx stream according to
 760          * STA/TID and check if this STA/TID is on aggregation
 761          */
 762
 763         if (!sta)
 764                 goto dont_reorder;
 765
 766         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 767
 768         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 769         if (!tid_agg_rx)
 770                 goto dont_reorder;
 771
 772         /* qos null data frames are excluded */
 773         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 774                 goto dont_reorder;
 775
 776         /* new, potentially un-ordered, ampdu frame - process it */
 777
 778         /* reset session timer */
 779         if (tid_agg_rx->timeout)
 780                 mod_timer(&tid_agg_rx->session_timer,
 781                           TU_TO_EXP_TIME(tid_agg_rx->timeout));
 782
 783         /* if this mpdu is fragmented - terminate rx aggregation session */
 784         sc = le16_to_cpu(hdr->seq_ctrl);
 785         if (sc & IEEE80211_SCTL_FRAG) {
 786                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 787                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 788                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 789                 return;
 790         }
 791
 792         /*
 793          * No locking needed -- we will only ever process one
 794          * RX packet at a time, and thus own tid_agg_rx. All
 795          * other code manipulating it needs to (and does) make
 796          * sure that we cannot get to it any more before doing
 797          * anything with it.
 798          */
 799         if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
 800                 return;
 801
 802  dont_reorder:
 803         __skb_queue_tail(frames, skb);
 804 }
 805
 806 static ieee80211_rx_result debug_noinline
 807 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 808 {
 809         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 810         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 811
 812         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 813         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 814                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 815                              rx->sta->last_seq_ctrl[rx->queue] ==
 816                              hdr->seq_ctrl)) {
 817                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 818                                 rx->local->dot11FrameDuplicateCount++;
 819                                 rx->sta->num_duplicates++;
 820                         }
 821                         return RX_DROP_MONITOR;
 822                 } else
 823                         rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
 824         }
 825
 826         if (unlikely(rx->skb->len < 16)) {
 827                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 828                 return RX_DROP_MONITOR;
 829         }
 830
 831         /* Drop disallowed frame classes based on STA auth/assoc state;
 832          * IEEE 802.11, Chap 5.5.
 833          *
 834          * mac80211 filters only based on association state, i.e. it drops
 835          * Class 3 frames from not associated stations. hostapd sends
 836          * deauth/disassoc frames when needed. In addition, hostapd is
 837          * responsible for filtering on both auth and assoc states.
 838          */
 839
 840         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 841                 return ieee80211_rx_mesh_check(rx);
 842
 843         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 844                       ieee80211_is_pspoll(hdr->frame_control)) &&
 845                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 846                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 847                      (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
 848                 if ((!ieee80211_has_fromds(hdr->frame_control) &&
 849                      !ieee80211_has_tods(hdr->frame_control) &&
 850                      ieee80211_is_data(hdr->frame_control)) ||
 851                     !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
 852                         /* Drop IBSS frames and frames for other hosts
 853                          * silently. */
 854                         return RX_DROP_MONITOR;
 855                 }
 856
 857                 return RX_DROP_MONITOR;
 858         }
 859
 860         return RX_CONTINUE;
 861 }
 862
 863
 864 static ieee80211_rx_result debug_noinline
 865 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
 866 {
 867         struct sk_buff *skb = rx->skb;
 868         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 869         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 870         int keyidx;
 871         int hdrlen;
 872         ieee80211_rx_result result = RX_DROP_UNUSABLE;
 873         struct ieee80211_key *sta_ptk = NULL;
 874         int mmie_keyidx = -1;
 875         __le16 fc;
 876
 877         /*
 878          * Key selection 101
 879          *
 880          * There are four types of keys:
 881          *  - GTK (group keys)
 882          *  - IGTK (group keys for management frames)
 883          *  - PTK (pairwise keys)
 884          *  - STK (station-to-station pairwise keys)
 885          *
 886          * When selecting a key, we have to distinguish between multicast
 887          * (including broadcast) and unicast frames, the latter can only
 888          * use PTKs and STKs while the former always use GTKs and IGTKs.
 889          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
 890          * unicast frames can also use key indices like GTKs. Hence, if we
 891          * don't have a PTK/STK we check the key index for a WEP key.
 892          *
 893          * Note that in a regular BSS, multicast frames are sent by the
 894          * AP only, associated stations unicast the frame to the AP first
 895          * which then multicasts it on their behalf.
 896          *
 897          * There is also a slight problem in IBSS mode: GTKs are negotiated
 898          * with each station, that is something we don't currently handle.
 899          * The spec seems to expect that one negotiates the same key with
 900          * every station but there's no such requirement; VLANs could be
 901          * possible.
 902          */
 903
 904         /*
 905          * No point in finding a key and decrypting if the frame is neither
 906          * addressed to us nor a multicast frame.
 907          */
 908         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 909                 return RX_CONTINUE;
 910
 911         /* start without a key */
 912         rx->key = NULL;
 913
 914         if (rx->sta)
 915                 sta_ptk = rcu_dereference(rx->sta->ptk);
 916
 917         fc = hdr->frame_control;
 918
 919         if (!ieee80211_has_protected(fc))
 920                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
 921
 922         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
 923                 rx->key = sta_ptk;
 924                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 925                     (status->flag & RX_FLAG_IV_STRIPPED))
 926                         return RX_CONTINUE;
 927                 /* Skip decryption if the frame is not protected. */
 928                 if (!ieee80211_has_protected(fc))
 929                         return RX_CONTINUE;
 930         } else if (mmie_keyidx >= 0) {
 931                 /* Broadcast/multicast robust management frame / BIP */
 932                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 933                     (status->flag & RX_FLAG_IV_STRIPPED))
 934                         return RX_CONTINUE;
 935
 936                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
 937                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 938                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
 939                 if (rx->sta)
 940                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
 941                 if (!rx->key)
 942                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
 943         } else if (!ieee80211_has_protected(fc)) {
 944                 /*
 945                  * The frame was not protected, so skip decryption. However, we
 946                  * need to set rx->key if there is a key that could have been
 947                  * used so that the frame may be dropped if encryption would
 948                  * have been expected.
 949                  */
 950                 struct ieee80211_key *key = NULL;
 951                 if (ieee80211_is_mgmt(fc) &&
 952                     is_multicast_ether_addr(hdr->addr1) &&
 953                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
 954                         rx->key = key;
 955                 else if ((key = rcu_dereference(rx->sdata->default_key)))
 956                         rx->key = key;
 957                 return RX_CONTINUE;
 958         } else {
 959                 u8 keyid;
 960                 /*
 961                  * The device doesn't give us the IV so we won't be
 962                  * able to look up the key. That's ok though, we
 963                  * don't need to decrypt the frame, we just won't
 964                  * be able to keep statistics accurate.
 965                  * Except for key threshold notifications, should
 966                  * we somehow allow the driver to tell us which key
 967                  * the hardware used if this flag is set?
 968                  */
 969                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 970                     (status->flag & RX_FLAG_IV_STRIPPED))
 971                         return RX_CONTINUE;
 972
 973                 hdrlen = ieee80211_hdrlen(fc);
 974
 975                 if (rx->skb->len < 8 + hdrlen)
 976                         return RX_DROP_UNUSABLE; /* TODO: count this? */
 977
 978                 /*
 979                  * no need to call ieee80211_wep_get_keyidx,
 980                  * it verifies a bunch of things we've done already
 981                  */
 982                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
 983                 keyidx = keyid >> 6;
 984
 985                 /* check per-station GTK first, if multicast packet */
 986                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
 987                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
 988
 989                 /* if not found, try default key */
 990                 if (!rx->key) {
 991                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
 992
 993                         /*
 994                          * RSNA-protected unicast frames should always be
 995                          * sent with pairwise or station-to-station keys,
 996                          * but for WEP we allow using a key index as well.
 997                          */
 998                         if (rx->key &&
 999                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1000                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1001                             !is_multicast_ether_addr(hdr->addr1))
1002                                 rx->key = NULL;
1003                 }
1004         }
1005
1006         if (rx->key) {
1007                 rx->key->tx_rx_count++;
1008                 /* TODO: add threshold stuff again */
1009         } else {
1010                 return RX_DROP_MONITOR;
1011         }
1012
1013         if (skb_linearize(rx->skb))
1014                 return RX_DROP_UNUSABLE;
1015         /* the hdr variable is invalid now! */
1016
1017         switch (rx->key->conf.cipher) {
1018         case WLAN_CIPHER_SUITE_WEP40:
1019         case WLAN_CIPHER_SUITE_WEP104:
1020                 /* Check for weak IVs if possible */
1021                 if (rx->sta && ieee80211_is_data(fc) &&
1022                     (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1023                      !(status->flag & RX_FLAG_DECRYPTED)) &&
1024                     ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1025                         rx->sta->wep_weak_iv_count++;
1026
1027                 result = ieee80211_crypto_wep_decrypt(rx);
1028                 break;
1029         case WLAN_CIPHER_SUITE_TKIP:
1030                 result = ieee80211_crypto_tkip_decrypt(rx);
1031                 break;
1032         case WLAN_CIPHER_SUITE_CCMP:
1033                 result = ieee80211_crypto_ccmp_decrypt(rx);
1034                 break;
1035         case WLAN_CIPHER_SUITE_AES_CMAC:
1036                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1037                 break;
1038         default:
1039                 /*
1040                  * We can reach here only with HW-only algorithms
1041                  * but why didn't it decrypt the frame?!
1042                  */
1043                 return RX_DROP_UNUSABLE;
1044         }
1045
1046         /* either the frame has been decrypted or will be dropped */
1047         status->flag |= RX_FLAG_DECRYPTED;
1048
1049         return result;
1050 }
1051
1052 static ieee80211_rx_result debug_noinline
1053 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1054 {
1055         struct ieee80211_local *local;
1056         struct ieee80211_hdr *hdr;
1057         struct sk_buff *skb;
1058
1059         local = rx->local;
1060         skb = rx->skb;
1061         hdr = (struct ieee80211_hdr *) skb->data;
1062
1063         if (!local->pspolling)
1064                 return RX_CONTINUE;
1065
1066         if (!ieee80211_has_fromds(hdr->frame_control))
1067                 /* this is not from AP */
1068                 return RX_CONTINUE;
1069
1070         if (!ieee80211_is_data(hdr->frame_control))
1071                 return RX_CONTINUE;
1072
1073         if (!ieee80211_has_moredata(hdr->frame_control)) {
1074                 /* AP has no more frames buffered for us */
1075                 local->pspolling = false;
1076                 return RX_CONTINUE;
1077         }
1078
1079         /* more data bit is set, let's request a new frame from the AP */
1080         ieee80211_send_pspoll(local, rx->sdata);
1081
1082         return RX_CONTINUE;
1083 }
1084
1085 static void ap_sta_ps_start(struct sta_info *sta)
1086 {
1087         struct ieee80211_sub_if_data *sdata = sta->sdata;
1088         struct ieee80211_local *local = sdata->local;
1089
1090         atomic_inc(&sdata->bss->num_sta_ps);
1091         set_sta_flags(sta, WLAN_STA_PS_STA);
1092         drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1093 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1094         printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1095                sdata->name, sta->sta.addr, sta->sta.aid);
1096 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1097 }
1098
1099 static void ap_sta_ps_end(struct sta_info *sta)
1100 {
1101         struct ieee80211_sub_if_data *sdata = sta->sdata;
1102
1103         atomic_dec(&sdata->bss->num_sta_ps);
1104
1105 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1106         printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1107                sdata->name, sta->sta.addr, sta->sta.aid);
1108 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1109
1110         if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1111 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1112                 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1113                        sdata->name, sta->sta.addr, sta->sta.aid);
1114 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1115                 return;
1116         }
1117
1118         ieee80211_sta_ps_deliver_wakeup(sta);
1119 }
1120
1121 static ieee80211_rx_result debug_noinline
1122 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1123 {
1124         struct sta_info *sta = rx->sta;
1125         struct sk_buff *skb = rx->skb;
1126         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1127         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1128
1129         if (!sta)
1130                 return RX_CONTINUE;
1131
1132         /*
1133          * Update last_rx only for IBSS packets which are for the current
1134          * BSSID to avoid keeping the current IBSS network alive in cases
1135          * where other STAs start using different BSSID.
1136          */
1137         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1138                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1139                                                 NL80211_IFTYPE_ADHOC);
1140                 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1141                         sta->last_rx = jiffies;
1142         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1143                 /*
1144                  * Mesh beacons will update last_rx when if they are found to
1145                  * match the current local configuration when processed.
1146                  */
1147                 sta->last_rx = jiffies;
1148         }
1149
1150         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1151                 return RX_CONTINUE;
1152
1153         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1154                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1155
1156         sta->rx_fragments++;
1157         sta->rx_bytes += rx->skb->len;
1158         sta->last_signal = status->signal;
1159         ewma_add(&sta->avg_signal, -status->signal);
1160
1161         /*
1162          * Change STA power saving mode only at the end of a frame
1163          * exchange sequence.
1164          */
1165         if (!ieee80211_has_morefrags(hdr->frame_control) &&
1166             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1167              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1168                 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1169                         /*
1170                          * Ignore doze->wake transitions that are
1171                          * indicated by non-data frames, the standard
1172                          * is unclear here, but for example going to
1173                          * PS mode and then scanning would cause a
1174                          * doze->wake transition for the probe request,
1175                          * and that is clearly undesirable.
1176                          */
1177                         if (ieee80211_is_data(hdr->frame_control) &&
1178                             !ieee80211_has_pm(hdr->frame_control))
1179                                 ap_sta_ps_end(sta);
1180                 } else {
1181                         if (ieee80211_has_pm(hdr->frame_control))
1182                                 ap_sta_ps_start(sta);
1183                 }
1184         }
1185
1186         /*
1187          * Drop (qos-)data::nullfunc frames silently, since they
1188          * are used only to control station power saving mode.
1189          */
1190         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1191             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1192                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1193
1194                 /*
1195                  * If we receive a 4-addr nullfunc frame from a STA
1196                  * that was not moved to a 4-addr STA vlan yet, drop
1197                  * the frame to the monitor interface, to make sure
1198                  * that hostapd sees it
1199                  */
1200                 if (ieee80211_has_a4(hdr->frame_control) &&
1201                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1202                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1203                       !rx->sdata->u.vlan.sta)))
1204                         return RX_DROP_MONITOR;
1205                 /*
1206                  * Update counter and free packet here to avoid
1207                  * counting this as a dropped packed.
1208                  */
1209                 sta->rx_packets++;
1210                 dev_kfree_skb(rx->skb);
1211                 return RX_QUEUED;
1212         }
1213
1214         return RX_CONTINUE;
1215 } /* ieee80211_rx_h_sta_process */
1216
1217 static inline struct ieee80211_fragment_entry *
1218 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1219                          unsigned int frag, unsigned int seq, int rx_queue,
1220                          struct sk_buff **skb)
1221 {
1222         struct ieee80211_fragment_entry *entry;
1223         int idx;
1224
1225         idx = sdata->fragment_next;
1226         entry = &sdata->fragments[sdata->fragment_next++];
1227         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1228                 sdata->fragment_next = 0;
1229
1230         if (!skb_queue_empty(&entry->skb_list)) {
1231 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1232                 struct ieee80211_hdr *hdr =
1233                         (struct ieee80211_hdr *) entry->skb_list.next->data;
1234                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1235                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1236                        "addr1=%pM addr2=%pM\n",
1237                        sdata->name, idx,
1238                        jiffies - entry->first_frag_time, entry->seq,
1239                        entry->last_frag, hdr->addr1, hdr->addr2);
1240 #endif
1241                 __skb_queue_purge(&entry->skb_list);
1242         }
1243
1244         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1245         *skb = NULL;
1246         entry->first_frag_time = jiffies;
1247         entry->seq = seq;
1248         entry->rx_queue = rx_queue;
1249         entry->last_frag = frag;
1250         entry->ccmp = 0;
1251         entry->extra_len = 0;
1252
1253         return entry;
1254 }
1255
1256 static inline struct ieee80211_fragment_entry *
1257 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1258                           unsigned int frag, unsigned int seq,
1259                           int rx_queue, struct ieee80211_hdr *hdr)
1260 {
1261         struct ieee80211_fragment_entry *entry;
1262         int i, idx;
1263
1264         idx = sdata->fragment_next;
1265         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1266                 struct ieee80211_hdr *f_hdr;
1267
1268                 idx--;
1269                 if (idx < 0)
1270                         idx = IEEE80211_FRAGMENT_MAX - 1;
1271
1272                 entry = &sdata->fragments[idx];
1273                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1274                     entry->rx_queue != rx_queue ||
1275                     entry->last_frag + 1 != frag)
1276                         continue;
1277
1278                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1279
1280                 /*
1281                  * Check ftype and addresses are equal, else check next fragment
1282                  */
1283                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1284                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1285                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1286                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1287                         continue;
1288
1289                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1290                         __skb_queue_purge(&entry->skb_list);
1291                         continue;
1292                 }
1293                 return entry;
1294         }
1295
1296         return NULL;
1297 }
1298
1299 static ieee80211_rx_result debug_noinline
1300 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1301 {
1302         struct ieee80211_hdr *hdr;
1303         u16 sc;
1304         __le16 fc;
1305         unsigned int frag, seq;
1306         struct ieee80211_fragment_entry *entry;
1307         struct sk_buff *skb;
1308         struct ieee80211_rx_status *status;
1309
1310         hdr = (struct ieee80211_hdr *)rx->skb->data;
1311         fc = hdr->frame_control;
1312         sc = le16_to_cpu(hdr->seq_ctrl);
1313         frag = sc & IEEE80211_SCTL_FRAG;
1314
1315         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1316                    (rx->skb)->len < 24 ||
1317                    is_multicast_ether_addr(hdr->addr1))) {
1318                 /* not fragmented */
1319                 goto out;
1320         }
1321         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1322
1323         if (skb_linearize(rx->skb))
1324                 return RX_DROP_UNUSABLE;
1325
1326         /*
1327          *  skb_linearize() might change the skb->data and
1328          *  previously cached variables (in this case, hdr) need to
1329          *  be refreshed with the new data.
1330          */
1331         hdr = (struct ieee80211_hdr *)rx->skb->data;
1332         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1333
1334         if (frag == 0) {
1335                 /* This is the first fragment of a new frame. */
1336                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1337                                                  rx->queue, &(rx->skb));
1338                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1339                     ieee80211_has_protected(fc)) {
1340                         int queue = ieee80211_is_mgmt(fc) ?
1341                                 NUM_RX_DATA_QUEUES : rx->queue;
1342                         /* Store CCMP PN so that we can verify that the next
1343                          * fragment has a sequential PN value. */
1344                         entry->ccmp = 1;
1345                         memcpy(entry->last_pn,
1346                                rx->key->u.ccmp.rx_pn[queue],
1347                                CCMP_PN_LEN);
1348                 }
1349                 return RX_QUEUED;
1350         }
1351
1352         /* This is a fragment for a frame that should already be pending in
1353          * fragment cache. Add this fragment to the end of the pending entry.
1354          */
1355         entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1356         if (!entry) {
1357                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1358                 return RX_DROP_MONITOR;
1359         }
1360
1361         /* Verify that MPDUs within one MSDU have sequential PN values.
1362          * (IEEE 802.11i, 8.3.3.4.5) */
1363         if (entry->ccmp) {
1364                 int i;
1365                 u8 pn[CCMP_PN_LEN], *rpn;
1366                 int queue;
1367                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1368                         return RX_DROP_UNUSABLE;
1369                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1370                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1371                         pn[i]++;
1372                         if (pn[i])
1373                                 break;
1374                 }
1375                 queue = ieee80211_is_mgmt(fc) ?
1376                         NUM_RX_DATA_QUEUES : rx->queue;
1377                 rpn = rx->key->u.ccmp.rx_pn[queue];
1378                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1379                         return RX_DROP_UNUSABLE;
1380                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1381         }
1382
1383         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1384         __skb_queue_tail(&entry->skb_list, rx->skb);
1385         entry->last_frag = frag;
1386         entry->extra_len += rx->skb->len;
1387         if (ieee80211_has_morefrags(fc)) {
1388                 rx->skb = NULL;
1389                 return RX_QUEUED;
1390         }
1391
1392         rx->skb = __skb_dequeue(&entry->skb_list);
1393         if (skb_tailroom(rx->skb) < entry->extra_len) {
1394                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1395                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1396                                               GFP_ATOMIC))) {
1397                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1398                         __skb_queue_purge(&entry->skb_list);
1399                         return RX_DROP_UNUSABLE;
1400                 }
1401         }
1402         while ((skb = __skb_dequeue(&entry->skb_list))) {
1403                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1404                 dev_kfree_skb(skb);
1405         }
1406
1407         /* Complete frame has been reassembled - process it now */
1408         status = IEEE80211_SKB_RXCB(rx->skb);
1409         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1410
1411  out:
1412         if (rx->sta)
1413                 rx->sta->rx_packets++;
1414         if (is_multicast_ether_addr(hdr->addr1))
1415                 rx->local->dot11MulticastReceivedFrameCount++;
1416         else
1417                 ieee80211_led_rx(rx->local);
1418         return RX_CONTINUE;
1419 }
1420
1421 static ieee80211_rx_result debug_noinline
1422 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1423 {
1424         struct ieee80211_sub_if_data *sdata = rx->sdata;
1425         __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1426         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1427
1428         if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1429                    !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
1430                 return RX_CONTINUE;
1431
1432         if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1433             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1434                 return RX_DROP_UNUSABLE;
1435
1436         if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1437                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1438         else
1439                 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1440
1441         /* Free PS Poll skb here instead of returning RX_DROP that would
1442          * count as an dropped frame. */
1443         dev_kfree_skb(rx->skb);
1444
1445         return RX_QUEUED;
1446 }
1447
1448 static ieee80211_rx_result debug_noinline
1449 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1450 {
1451         u8 *data = rx->skb->data;
1452         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1453
1454         if (!ieee80211_is_data_qos(hdr->frame_control))
1455                 return RX_CONTINUE;
1456
1457         /* remove the qos control field, update frame type and meta-data */
1458         memmove(data + IEEE80211_QOS_CTL_LEN, data,
1459                 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1460         hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1461         /* change frame type to non QOS */
1462         hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1463
1464         return RX_CONTINUE;
1465 }
1466
1467 static int
1468 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1469 {
1470         if (unlikely(!rx->sta ||
1471             !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1472                 return -EACCES;
1473
1474         return 0;
1475 }
1476
1477 static int
1478 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1479 {
1480         struct sk_buff *skb = rx->skb;
1481         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1482
1483         /*
1484          * Pass through unencrypted frames if the hardware has
1485          * decrypted them already.
1486          */
1487         if (status->flag & RX_FLAG_DECRYPTED)
1488                 return 0;
1489
1490         /* Drop unencrypted frames if key is set. */
1491         if (unlikely(!ieee80211_has_protected(fc) &&
1492                      !ieee80211_is_nullfunc(fc) &&
1493                      ieee80211_is_data(fc) &&
1494                      (rx->key || rx->sdata->drop_unencrypted)))
1495                 return -EACCES;
1496
1497         return 0;
1498 }
1499
1500 static int
1501 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1502 {
1503         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1504         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1505         __le16 fc = hdr->frame_control;
1506
1507         /*
1508          * Pass through unencrypted frames if the hardware has
1509          * decrypted them already.
1510          */
1511         if (status->flag & RX_FLAG_DECRYPTED)
1512                 return 0;
1513
1514         if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1515                 if (unlikely(!ieee80211_has_protected(fc) &&
1516                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1517                              rx->key))
1518                         return -EACCES;
1519                 /* BIP does not use Protected field, so need to check MMIE */
1520                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1521                              ieee80211_get_mmie_keyidx(rx->skb) < 0))
1522                         return -EACCES;
1523                 /*
1524                  * When using MFP, Action frames are not allowed prior to
1525                  * having configured keys.
1526                  */
1527                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1528                              ieee80211_is_robust_mgmt_frame(
1529                                      (struct ieee80211_hdr *) rx->skb->data)))
1530                         return -EACCES;
1531         }
1532
1533         return 0;
1534 }
1535
1536 static int
1537 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1538 {
1539         struct ieee80211_sub_if_data *sdata = rx->sdata;
1540         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1541
1542         if (ieee80211_has_a4(hdr->frame_control) &&
1543             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1544                 return -1;
1545
1546         if (is_multicast_ether_addr(hdr->addr1) &&
1547             ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1548              (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1549                 return -1;
1550
1551         return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1552 }
1553
1554 /*
1555  * requires that rx->skb is a frame with ethernet header
1556  */
1557 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1558 {
1559         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1560                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1561         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1562
1563         /*
1564          * Allow EAPOL frames to us/the PAE group address regardless
1565          * of whether the frame was encrypted or not.
1566          */
1567         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1568             (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1569              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1570                 return true;
1571
1572         if (ieee80211_802_1x_port_control(rx) ||
1573             ieee80211_drop_unencrypted(rx, fc))
1574                 return false;
1575
1576         return true;
1577 }
1578
1579 /*
1580  * requires that rx->skb is a frame with ethernet header
1581  */
1582 static void
1583 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1584 {
1585         struct ieee80211_sub_if_data *sdata = rx->sdata;
1586         struct net_device *dev = sdata->dev;
1587         struct sk_buff *skb, *xmit_skb;
1588         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1589         struct sta_info *dsta;
1590         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1591
1592         skb = rx->skb;
1593         xmit_skb = NULL;
1594
1595         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1596              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1597             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1598             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1599             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1600                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1601                         /*
1602                          * send multicast frames both to higher layers in
1603                          * local net stack and back to the wireless medium
1604                          */
1605                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1606                         if (!xmit_skb && net_ratelimit())
1607                                 printk(KERN_DEBUG "%s: failed to clone "
1608                                        "multicast frame\n", dev->name);
1609                 } else {
1610                         dsta = sta_info_get(sdata, skb->data);
1611                         if (dsta) {
1612                                 /*
1613                                  * The destination station is associated to
1614                                  * this AP (in this VLAN), so send the frame
1615                                  * directly to it and do not pass it to local
1616                                  * net stack.
1617                                  */
1618                                 xmit_skb = skb;
1619                                 skb = NULL;
1620                         }
1621                 }
1622         }
1623
1624         if (skb) {
1625                 int align __maybe_unused;
1626
1627 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1628                 /*
1629                  * 'align' will only take the values 0 or 2 here
1630                  * since all frames are required to be aligned
1631                  * to 2-byte boundaries when being passed to
1632                  * mac80211. That also explains the __skb_push()
1633                  * below.
1634                  */
1635                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1636                 if (align) {
1637                         if (WARN_ON(skb_headroom(skb) < 3)) {
1638                                 dev_kfree_skb(skb);
1639                                 skb = NULL;
1640                         } else {
1641                                 u8 *data = skb->data;
1642                                 size_t len = skb_headlen(skb);
1643                                 skb->data -= align;
1644                                 memmove(skb->data, data, len);
1645                                 skb_set_tail_pointer(skb, len);
1646                         }
1647                 }
1648 #endif
1649
1650                 if (skb) {
1651                         /* deliver to local stack */
1652                         skb->protocol = eth_type_trans(skb, dev);
1653                         memset(skb->cb, 0, sizeof(skb->cb));
1654                         netif_receive_skb(skb);
1655                 }
1656         }
1657
1658         if (xmit_skb) {
1659                 /* send to wireless media */
1660                 xmit_skb->protocol = htons(ETH_P_802_3);
1661                 skb_reset_network_header(xmit_skb);
1662                 skb_reset_mac_header(xmit_skb);
1663                 dev_queue_xmit(xmit_skb);
1664         }
1665 }
1666
1667 static ieee80211_rx_result debug_noinline
1668 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1669 {
1670         struct net_device *dev = rx->sdata->dev;
1671         struct sk_buff *skb = rx->skb;
1672         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1673         __le16 fc = hdr->frame_control;
1674         struct sk_buff_head frame_list;
1675         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1676
1677         if (unlikely(!ieee80211_is_data(fc)))
1678                 return RX_CONTINUE;
1679
1680         if (unlikely(!ieee80211_is_data_present(fc)))
1681                 return RX_DROP_MONITOR;
1682
1683         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1684                 return RX_CONTINUE;
1685
1686         if (ieee80211_has_a4(hdr->frame_control) &&
1687             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1688             !rx->sdata->u.vlan.sta)
1689                 return RX_DROP_UNUSABLE;
1690
1691         if (is_multicast_ether_addr(hdr->addr1) &&
1692             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1693               rx->sdata->u.vlan.sta) ||
1694              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1695               rx->sdata->u.mgd.use_4addr)))
1696                 return RX_DROP_UNUSABLE;
1697
1698         skb->dev = dev;
1699         __skb_queue_head_init(&frame_list);
1700
1701         if (skb_linearize(skb))
1702                 return RX_DROP_UNUSABLE;
1703
1704         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1705                                  rx->sdata->vif.type,
1706                                  rx->local->hw.extra_tx_headroom);
1707
1708         while (!skb_queue_empty(&frame_list)) {
1709                 rx->skb = __skb_dequeue(&frame_list);
1710
1711                 if (!ieee80211_frame_allowed(rx, fc)) {
1712                         dev_kfree_skb(rx->skb);
1713                         continue;
1714                 }
1715                 dev->stats.rx_packets++;
1716                 dev->stats.rx_bytes += rx->skb->len;
1717
1718                 ieee80211_deliver_skb(rx);
1719         }
1720
1721         return RX_QUEUED;
1722 }
1723
1724 #ifdef CONFIG_MAC80211_MESH
1725 static ieee80211_rx_result
1726 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1727 {
1728         struct ieee80211_hdr *hdr;
1729         struct ieee80211s_hdr *mesh_hdr;
1730         unsigned int hdrlen;
1731         struct sk_buff *skb = rx->skb, *fwd_skb;
1732         struct ieee80211_local *local = rx->local;
1733         struct ieee80211_sub_if_data *sdata = rx->sdata;
1734         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1735
1736         hdr = (struct ieee80211_hdr *) skb->data;
1737         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1738         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1739
1740         if (!ieee80211_is_data(hdr->frame_control))
1741                 return RX_CONTINUE;
1742
1743         if (!mesh_hdr->ttl)
1744                 /* illegal frame */
1745                 return RX_DROP_MONITOR;
1746
1747         if (mesh_hdr->flags & MESH_FLAGS_AE) {
1748                 struct mesh_path *mppath;
1749                 char *proxied_addr;
1750                 char *mpp_addr;
1751
1752                 if (is_multicast_ether_addr(hdr->addr1)) {
1753                         mpp_addr = hdr->addr3;
1754                         proxied_addr = mesh_hdr->eaddr1;
1755                 } else {
1756                         mpp_addr = hdr->addr4;
1757                         proxied_addr = mesh_hdr->eaddr2;
1758                 }
1759
1760                 rcu_read_lock();
1761                 mppath = mpp_path_lookup(proxied_addr, sdata);
1762                 if (!mppath) {
1763                         mpp_path_add(proxied_addr, mpp_addr, sdata);
1764                 } else {
1765                         spin_lock_bh(&mppath->state_lock);
1766                         if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1767                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1768                         spin_unlock_bh(&mppath->state_lock);
1769                 }
1770                 rcu_read_unlock();
1771         }
1772
1773         /* Frame has reached destination.  Don't forward */
1774         if (!is_multicast_ether_addr(hdr->addr1) &&
1775             compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1776                 return RX_CONTINUE;
1777
1778         mesh_hdr->ttl--;
1779
1780         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1781                 if (!mesh_hdr->ttl)
1782                         IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1783                                                      dropped_frames_ttl);
1784                 else {
1785                         struct ieee80211_hdr *fwd_hdr;
1786                         struct ieee80211_tx_info *info;
1787
1788                         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1789
1790                         if (!fwd_skb && net_ratelimit())
1791                                 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1792                                                    sdata->name);
1793
1794                         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1795                         memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1796                         info = IEEE80211_SKB_CB(fwd_skb);
1797                         memset(info, 0, sizeof(*info));
1798                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1799                         info->control.vif = &rx->sdata->vif;
1800                         skb_set_queue_mapping(skb,
1801                                 ieee80211_select_queue(rx->sdata, fwd_skb));
1802                         ieee80211_set_qos_hdr(local, skb);
1803                         if (is_multicast_ether_addr(fwd_hdr->addr1))
1804                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1805                                                                 fwded_mcast);
1806                         else {
1807                                 int err;
1808                                 /*
1809                                  * Save TA to addr1 to send TA a path error if a
1810                                  * suitable next hop is not found
1811                                  */
1812                                 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1813                                                 ETH_ALEN);
1814                                 err = mesh_nexthop_lookup(fwd_skb, sdata);
1815                                 /* Failed to immediately resolve next hop:
1816                                  * fwded frame was dropped or will be added
1817                                  * later to the pending skb queue.  */
1818                                 if (err)
1819                                         return RX_DROP_MONITOR;
1820
1821                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1822                                                                 fwded_unicast);
1823                         }
1824                         IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1825                                                      fwded_frames);
1826                         ieee80211_add_pending_skb(local, fwd_skb);
1827                 }
1828         }
1829
1830         if (is_multicast_ether_addr(hdr->addr1) ||
1831             sdata->dev->flags & IFF_PROMISC)
1832                 return RX_CONTINUE;
1833         else
1834                 return RX_DROP_MONITOR;
1835 }
1836 #endif
1837
1838 static ieee80211_rx_result debug_noinline
1839 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1840 {
1841         struct ieee80211_sub_if_data *sdata = rx->sdata;
1842         struct ieee80211_local *local = rx->local;
1843         struct net_device *dev = sdata->dev;
1844         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1845         __le16 fc = hdr->frame_control;
1846         int err;
1847
1848         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1849                 return RX_CONTINUE;
1850
1851         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1852                 return RX_DROP_MONITOR;
1853
1854         /*
1855          * Allow the cooked monitor interface of an AP to see 4-addr frames so
1856          * that a 4-addr station can be detected and moved into a separate VLAN
1857          */
1858         if (ieee80211_has_a4(hdr->frame_control) &&
1859             sdata->vif.type == NL80211_IFTYPE_AP)
1860                 return RX_DROP_MONITOR;
1861
1862         err = __ieee80211_data_to_8023(rx);
1863         if (unlikely(err))
1864                 return RX_DROP_UNUSABLE;
1865
1866         if (!ieee80211_frame_allowed(rx, fc))
1867                 return RX_DROP_MONITOR;
1868
1869         rx->skb->dev = dev;
1870
1871         dev->stats.rx_packets++;
1872         dev->stats.rx_bytes += rx->skb->len;
1873
1874         if (ieee80211_is_data(hdr->frame_control) &&
1875             !is_multicast_ether_addr(hdr->addr1) &&
1876             local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1877                         mod_timer(&local->dynamic_ps_timer, jiffies +
1878                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1879         }
1880
1881         ieee80211_deliver_skb(rx);
1882
1883         return RX_QUEUED;
1884 }
1885
1886 static ieee80211_rx_result debug_noinline
1887 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1888 {
1889         struct ieee80211_local *local = rx->local;
1890         struct ieee80211_hw *hw = &local->hw;
1891         struct sk_buff *skb = rx->skb;
1892         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1893         struct tid_ampdu_rx *tid_agg_rx;
1894         u16 start_seq_num;
1895         u16 tid;
1896
1897         if (likely(!ieee80211_is_ctl(bar->frame_control)))
1898                 return RX_CONTINUE;
1899
1900         if (ieee80211_is_back_req(bar->frame_control)) {
1901                 struct {
1902                         __le16 control, start_seq_num;
1903                 } __packed bar_data;
1904
1905                 if (!rx->sta)
1906                         return RX_DROP_MONITOR;
1907
1908                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1909                                   &bar_data, sizeof(bar_data)))
1910                         return RX_DROP_MONITOR;
1911
1912                 tid = le16_to_cpu(bar_data.control) >> 12;
1913
1914                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1915                 if (!tid_agg_rx)
1916                         return RX_DROP_MONITOR;
1917
1918                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1919
1920                 /* reset session timer */
1921                 if (tid_agg_rx->timeout)
1922                         mod_timer(&tid_agg_rx->session_timer,
1923                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
1924
1925                 /* release stored frames up to start of BAR */
1926                 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1927                                                  frames);
1928                 kfree_skb(skb);
1929                 return RX_QUEUED;
1930         }
1931
1932         /*
1933          * After this point, we only want management frames,
1934          * so we can drop all remaining control frames to
1935          * cooked monitor interfaces.
1936          */
1937         return RX_DROP_MONITOR;
1938 }
1939
1940 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1941                                            struct ieee80211_mgmt *mgmt,
1942                                            size_t len)
1943 {
1944         struct ieee80211_local *local = sdata->local;
1945         struct sk_buff *skb;
1946         struct ieee80211_mgmt *resp;
1947
1948         if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1949                 /* Not to own unicast address */
1950                 return;
1951         }
1952
1953         if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1954             compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1955                 /* Not from the current AP or not associated yet. */
1956                 return;
1957         }
1958
1959         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1960                 /* Too short SA Query request frame */
1961                 return;
1962         }
1963
1964         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1965         if (skb == NULL)
1966                 return;
1967
1968         skb_reserve(skb, local->hw.extra_tx_headroom);
1969         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1970         memset(resp, 0, 24);
1971         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1972         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1973         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1974         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1975                                           IEEE80211_STYPE_ACTION);
1976         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1977         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1978         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1979         memcpy(resp->u.action.u.sa_query.trans_id,
1980                mgmt->u.action.u.sa_query.trans_id,
1981                WLAN_SA_QUERY_TR_ID_LEN);
1982
1983         ieee80211_tx_skb(sdata, skb);
1984 }
1985
1986 static ieee80211_rx_result debug_noinline
1987 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1988 {
1989         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1990         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1991
1992         /*
1993          * From here on, look only at management frames.
1994          * Data and control frames are already handled,
1995          * and unknown (reserved) frames are useless.
1996          */
1997         if (rx->skb->len < 24)
1998                 return RX_DROP_MONITOR;
1999
2000         if (!ieee80211_is_mgmt(mgmt->frame_control))
2001                 return RX_DROP_MONITOR;
2002
2003         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2004                 return RX_DROP_MONITOR;
2005
2006         if (ieee80211_drop_unencrypted_mgmt(rx))
2007                 return RX_DROP_UNUSABLE;
2008
2009         return RX_CONTINUE;
2010 }
2011
2012 static ieee80211_rx_result debug_noinline
2013 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2014 {
2015         struct ieee80211_local *local = rx->local;
2016         struct ieee80211_sub_if_data *sdata = rx->sdata;
2017         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2018         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2019         int len = rx->skb->len;
2020
2021         if (!ieee80211_is_action(mgmt->frame_control))
2022                 return RX_CONTINUE;
2023
2024         /* drop too small frames */
2025         if (len < IEEE80211_MIN_ACTION_SIZE)
2026                 return RX_DROP_UNUSABLE;
2027
2028         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2029                 return RX_DROP_UNUSABLE;
2030
2031         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2032                 return RX_DROP_UNUSABLE;
2033
2034         switch (mgmt->u.action.category) {
2035         case WLAN_CATEGORY_BACK:
2036                 /*
2037                  * The aggregation code is not prepared to handle
2038                  * anything but STA/AP due to the BSSID handling;
2039                  * IBSS could work in the code but isn't supported
2040                  * by drivers or the standard.
2041                  */
2042                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2043                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2044                     sdata->vif.type != NL80211_IFTYPE_AP)
2045                         break;
2046
2047                 /* verify action_code is present */
2048                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2049                         break;
2050
2051                 switch (mgmt->u.action.u.addba_req.action_code) {
2052                 case WLAN_ACTION_ADDBA_REQ:
2053                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2054                                    sizeof(mgmt->u.action.u.addba_req)))
2055                                 goto invalid;
2056                         break;
2057                 case WLAN_ACTION_ADDBA_RESP:
2058                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2059                                    sizeof(mgmt->u.action.u.addba_resp)))
2060                                 goto invalid;
2061                         break;
2062                 case WLAN_ACTION_DELBA:
2063                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2064                                    sizeof(mgmt->u.action.u.delba)))
2065                                 goto invalid;
2066                         break;
2067                 default:
2068                         goto invalid;
2069                 }
2070
2071                 goto queue;
2072         case WLAN_CATEGORY_SPECTRUM_MGMT:
2073                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2074                         break;
2075
2076                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2077                         break;
2078
2079                 /* verify action_code is present */
2080                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2081                         break;
2082
2083                 switch (mgmt->u.action.u.measurement.action_code) {
2084                 case WLAN_ACTION_SPCT_MSR_REQ:
2085                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2086                                    sizeof(mgmt->u.action.u.measurement)))
2087                                 break;
2088                         ieee80211_process_measurement_req(sdata, mgmt, len);
2089                         goto handled;
2090                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2091                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2092                                    sizeof(mgmt->u.action.u.chan_switch)))
2093                                 break;
2094
2095                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2096                                 break;
2097
2098                         if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2099                                 break;
2100
2101                         goto queue;
2102                 }
2103                 break;
2104         case WLAN_CATEGORY_SA_QUERY:
2105                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2106                            sizeof(mgmt->u.action.u.sa_query)))
2107                         break;
2108
2109                 switch (mgmt->u.action.u.sa_query.action) {
2110                 case WLAN_ACTION_SA_QUERY_REQUEST:
2111                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2112                                 break;
2113                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2114                         goto handled;
2115                 }
2116                 break;
2117         case WLAN_CATEGORY_MESH_PLINK:
2118         case WLAN_CATEGORY_MESH_PATH_SEL:
2119                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2120                         break;
2121                 goto queue;
2122         }
2123
2124         return RX_CONTINUE;
2125
2126  invalid:
2127         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2128         /* will return in the next handlers */
2129         return RX_CONTINUE;
2130
2131  handled:
2132         if (rx->sta)
2133                 rx->sta->rx_packets++;
2134         dev_kfree_skb(rx->skb);
2135         return RX_QUEUED;
2136
2137  queue:
2138         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2139         skb_queue_tail(&sdata->skb_queue, rx->skb);
2140         ieee80211_queue_work(&local->hw, &sdata->work);
2141         if (rx->sta)
2142                 rx->sta->rx_packets++;
2143         return RX_QUEUED;
2144 }
2145
2146 static ieee80211_rx_result debug_noinline
2147 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2148 {
2149         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2150
2151         /* skip known-bad action frames and return them in the next handler */
2152         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2153                 return RX_CONTINUE;
2154
2155         /*
2156          * Getting here means the kernel doesn't know how to handle
2157          * it, but maybe userspace does ... include returned frames
2158          * so userspace can register for those to know whether ones
2159          * it transmitted were processed or returned.
2160          */
2161
2162         if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2163                              rx->skb->data, rx->skb->len,
2164                              GFP_ATOMIC)) {
2165                 if (rx->sta)
2166                         rx->sta->rx_packets++;
2167                 dev_kfree_skb(rx->skb);
2168                 return RX_QUEUED;
2169         }
2170
2171
2172         return RX_CONTINUE;
2173 }
2174
2175 static ieee80211_rx_result debug_noinline
2176 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2177 {
2178         struct ieee80211_local *local = rx->local;
2179         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2180         struct sk_buff *nskb;
2181         struct ieee80211_sub_if_data *sdata = rx->sdata;
2182         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2183
2184         if (!ieee80211_is_action(mgmt->frame_control))
2185                 return RX_CONTINUE;
2186
2187         /*
2188          * For AP mode, hostapd is responsible for handling any action
2189          * frames that we didn't handle, including returning unknown
2190          * ones. For all other modes we will return them to the sender,
2191          * setting the 0x80 bit in the action category, as required by
2192          * 802.11-2007 7.3.1.11.
2193          * Newer versions of hostapd shall also use the management frame
2194          * registration mechanisms, but older ones still use cooked
2195          * monitor interfaces so push all frames there.
2196          */
2197         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2198             (sdata->vif.type == NL80211_IFTYPE_AP ||
2199              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2200                 return RX_DROP_MONITOR;
2201
2202         /* do not return rejected action frames */
2203         if (mgmt->u.action.category & 0x80)
2204                 return RX_DROP_UNUSABLE;
2205
2206         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2207                                GFP_ATOMIC);
2208         if (nskb) {
2209                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2210
2211                 nmgmt->u.action.category |= 0x80;
2212                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2213                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2214
2215                 memset(nskb->cb, 0, sizeof(nskb->cb));
2216
2217                 ieee80211_tx_skb(rx->sdata, nskb);
2218         }
2219         dev_kfree_skb(rx->skb);
2220         return RX_QUEUED;
2221 }
2222
2223 static ieee80211_rx_result debug_noinline
2224 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2225 {
2226         struct ieee80211_sub_if_data *sdata = rx->sdata;
2227         ieee80211_rx_result rxs;
2228         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2229         __le16 stype;
2230
2231         rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2232         if (rxs != RX_CONTINUE)
2233                 return rxs;
2234
2235         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2236
2237         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2238             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2239             sdata->vif.type != NL80211_IFTYPE_STATION)
2240                 return RX_DROP_MONITOR;
2241
2242         switch (stype) {
2243         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2244         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2245                 /* process for all: mesh, mlme, ibss */
2246                 break;
2247         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2248         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2249                 /* process only for station */
2250                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2251                         return RX_DROP_MONITOR;
2252                 break;
2253         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2254         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2255                 /* process only for ibss */
2256                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2257                         return RX_DROP_MONITOR;
2258                 break;
2259         default:
2260                 return RX_DROP_MONITOR;
2261         }
2262
2263         /* queue up frame and kick off work to process it */
2264         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2265         skb_queue_tail(&sdata->skb_queue, rx->skb);
2266         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2267         if (rx->sta)
2268                 rx->sta->rx_packets++;
2269
2270         return RX_QUEUED;
2271 }
2272
2273 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2274                                             struct ieee80211_rx_data *rx)
2275 {
2276         int keyidx;
2277         unsigned int hdrlen;
2278
2279         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2280         if (rx->skb->len >= hdrlen + 4)
2281                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2282         else
2283                 keyidx = -1;
2284
2285         if (!rx->sta) {
2286                 /*
2287                  * Some hardware seem to generate incorrect Michael MIC
2288                  * reports; ignore them to avoid triggering countermeasures.
2289                  */
2290                 return;
2291         }
2292
2293         if (!ieee80211_has_protected(hdr->frame_control))
2294                 return;
2295
2296         if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2297                 /*
2298                  * APs with pairwise keys should never receive Michael MIC
2299                  * errors for non-zero keyidx because these are reserved for
2300                  * group keys and only the AP is sending real multicast
2301                  * frames in the BSS.
2302                  */
2303                 return;
2304         }
2305
2306         if (!ieee80211_is_data(hdr->frame_control) &&
2307             !ieee80211_is_auth(hdr->frame_control))
2308                 return;
2309
2310         mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2311                                         GFP_ATOMIC);
2312 }
2313
2314 /* TODO: use IEEE80211_RX_FRAGMENTED */
2315 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2316                                         struct ieee80211_rate *rate)
2317 {
2318         struct ieee80211_sub_if_data *sdata;
2319         struct ieee80211_local *local = rx->local;
2320         struct ieee80211_rtap_hdr {
2321                 struct ieee80211_radiotap_header hdr;
2322                 u8 flags;
2323                 u8 rate_or_pad;
2324                 __le16 chan_freq;
2325                 __le16 chan_flags;
2326         } __packed *rthdr;
2327         struct sk_buff *skb = rx->skb, *skb2;
2328         struct net_device *prev_dev = NULL;
2329         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2330
2331         /*
2332          * If cooked monitor has been processed already, then
2333          * don't do it again. If not, set the flag.
2334          */
2335         if (rx->flags & IEEE80211_RX_CMNTR)
2336                 goto out_free_skb;
2337         rx->flags |= IEEE80211_RX_CMNTR;
2338
2339         if (skb_headroom(skb) < sizeof(*rthdr) &&
2340             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2341                 goto out_free_skb;
2342
2343         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2344         memset(rthdr, 0, sizeof(*rthdr));
2345         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2346         rthdr->hdr.it_present =
2347                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2348                             (1 << IEEE80211_RADIOTAP_CHANNEL));
2349
2350         if (rate) {
2351                 rthdr->rate_or_pad = rate->bitrate / 5;
2352                 rthdr->hdr.it_present |=
2353                         cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2354         }
2355         rthdr->chan_freq = cpu_to_le16(status->freq);
2356
2357         if (status->band == IEEE80211_BAND_5GHZ)
2358                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2359                                                 IEEE80211_CHAN_5GHZ);
2360         else
2361                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2362                                                 IEEE80211_CHAN_2GHZ);
2363
2364         skb_set_mac_header(skb, 0);
2365         skb->ip_summed = CHECKSUM_UNNECESSARY;
2366         skb->pkt_type = PACKET_OTHERHOST;
2367         skb->protocol = htons(ETH_P_802_2);
2368
2369         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2370                 if (!ieee80211_sdata_running(sdata))
2371                         continue;
2372
2373                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2374                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2375                         continue;
2376
2377                 if (prev_dev) {
2378                         skb2 = skb_clone(skb, GFP_ATOMIC);
2379                         if (skb2) {
2380                                 skb2->dev = prev_dev;
2381                                 netif_receive_skb(skb2);
2382                         }
2383                 }
2384
2385                 prev_dev = sdata->dev;
2386                 sdata->dev->stats.rx_packets++;
2387                 sdata->dev->stats.rx_bytes += skb->len;
2388         }
2389
2390         if (prev_dev) {
2391                 skb->dev = prev_dev;
2392                 netif_receive_skb(skb);
2393                 return;
2394         }
2395
2396  out_free_skb:
2397         dev_kfree_skb(skb);
2398 }
2399
2400 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2401                                          ieee80211_rx_result res)
2402 {
2403         switch (res) {
2404         case RX_DROP_MONITOR:
2405                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2406                 if (rx->sta)
2407                         rx->sta->rx_dropped++;
2408                 /* fall through */
2409         case RX_CONTINUE: {
2410                 struct ieee80211_rate *rate = NULL;
2411                 struct ieee80211_supported_band *sband;
2412                 struct ieee80211_rx_status *status;
2413
2414                 status = IEEE80211_SKB_RXCB((rx->skb));
2415
2416                 sband = rx->local->hw.wiphy->bands[status->band];
2417                 if (!(status->flag & RX_FLAG_HT))
2418                         rate = &sband->bitrates[status->rate_idx];
2419
2420                 ieee80211_rx_cooked_monitor(rx, rate);
2421                 break;
2422                 }
2423         case RX_DROP_UNUSABLE:
2424                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2425                 if (rx->sta)
2426                         rx->sta->rx_dropped++;
2427                 dev_kfree_skb(rx->skb);
2428                 break;
2429         case RX_QUEUED:
2430                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2431                 break;
2432         }
2433 }
2434
2435 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2436                                   struct sk_buff_head *frames)
2437 {
2438         ieee80211_rx_result res = RX_DROP_MONITOR;
2439         struct sk_buff *skb;
2440
2441 #define CALL_RXH(rxh)                   \
2442         do {                            \
2443                 res = rxh(rx);          \
2444                 if (res != RX_CONTINUE) \
2445                         goto rxh_next;  \
2446         } while (0);
2447
2448         while ((skb = __skb_dequeue(frames))) {
2449                 /*
2450                  * all the other fields are valid across frames
2451                  * that belong to an aMPDU since they are on the
2452                  * same TID from the same station
2453                  */
2454                 rx->skb = skb;
2455                 rx->flags = 0;
2456
2457                 CALL_RXH(ieee80211_rx_h_decrypt)
2458                 CALL_RXH(ieee80211_rx_h_check_more_data)
2459                 CALL_RXH(ieee80211_rx_h_sta_process)
2460                 CALL_RXH(ieee80211_rx_h_defragment)
2461                 CALL_RXH(ieee80211_rx_h_ps_poll)
2462                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2463                 /* must be after MMIC verify so header is counted in MPDU mic */
2464                 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2465                 CALL_RXH(ieee80211_rx_h_amsdu)
2466 #ifdef CONFIG_MAC80211_MESH
2467                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2468                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2469 #endif
2470                 CALL_RXH(ieee80211_rx_h_data)
2471
2472                 /* special treatment -- needs the queue */
2473                 res = ieee80211_rx_h_ctrl(rx, frames);
2474                 if (res != RX_CONTINUE)
2475                         goto rxh_next;
2476
2477                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2478                 CALL_RXH(ieee80211_rx_h_action)
2479                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2480                 CALL_RXH(ieee80211_rx_h_action_return)
2481                 CALL_RXH(ieee80211_rx_h_mgmt)
2482
2483  rxh_next:
2484                 ieee80211_rx_handlers_result(rx, res);
2485
2486 #undef CALL_RXH
2487         }
2488 }
2489
2490 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2491 {
2492         struct sk_buff_head reorder_release;
2493         ieee80211_rx_result res = RX_DROP_MONITOR;
2494
2495         __skb_queue_head_init(&reorder_release);
2496
2497 #define CALL_RXH(rxh)                   \
2498         do {                            \
2499                 res = rxh(rx);          \
2500                 if (res != RX_CONTINUE) \
2501                         goto rxh_next;  \
2502         } while (0);
2503
2504         CALL_RXH(ieee80211_rx_h_passive_scan)
2505         CALL_RXH(ieee80211_rx_h_check)
2506
2507         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2508
2509         ieee80211_rx_handlers(rx, &reorder_release);
2510         return;
2511
2512  rxh_next:
2513         ieee80211_rx_handlers_result(rx, res);
2514
2515 #undef CALL_RXH
2516 }
2517
2518 /*
2519  * This function makes calls into the RX path. Therefore the
2520  * caller must hold the sta_info->lock and everything has to
2521  * be under rcu_read_lock protection as well.
2522  */
2523 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2524 {
2525         struct sk_buff_head frames;
2526         struct ieee80211_rx_data rx = {
2527                 .sta = sta,
2528                 .sdata = sta->sdata,
2529                 .local = sta->local,
2530                 .queue = tid,
2531         };
2532         struct tid_ampdu_rx *tid_agg_rx;
2533
2534         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2535         if (!tid_agg_rx)
2536                 return;
2537
2538         __skb_queue_head_init(&frames);
2539
2540         spin_lock(&tid_agg_rx->reorder_lock);
2541         ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2542         spin_unlock(&tid_agg_rx->reorder_lock);
2543
2544         ieee80211_rx_handlers(&rx, &frames);
2545 }
2546
2547 /* main receive path */
2548
2549 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2550                                 struct ieee80211_hdr *hdr)
2551 {
2552         struct ieee80211_sub_if_data *sdata = rx->sdata;
2553         struct sk_buff *skb = rx->skb;
2554         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2555         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2556         int multicast = is_multicast_ether_addr(hdr->addr1);
2557
2558         switch (sdata->vif.type) {
2559         case NL80211_IFTYPE_STATION:
2560                 if (!bssid && !sdata->u.mgd.use_4addr)
2561                         return 0;
2562                 if (!multicast &&
2563                     compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2564                         if (!(sdata->dev->flags & IFF_PROMISC))
2565                                 return 0;
2566                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2567                 }
2568                 break;
2569         case NL80211_IFTYPE_ADHOC:
2570                 if (!bssid)
2571                         return 0;
2572                 if (ieee80211_is_beacon(hdr->frame_control)) {
2573                         return 1;
2574                 }
2575                 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2576                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2577                                 return 0;
2578                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2579                 } else if (!multicast &&
2580                            compare_ether_addr(sdata->vif.addr,
2581                                               hdr->addr1) != 0) {
2582                         if (!(sdata->dev->flags & IFF_PROMISC))
2583                                 return 0;
2584                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2585                 } else if (!rx->sta) {
2586                         int rate_idx;
2587                         if (status->flag & RX_FLAG_HT)
2588                                 rate_idx = 0; /* TODO: HT rates */
2589                         else
2590                                 rate_idx = status->rate_idx;
2591                         rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2592                                         hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2593                 }
2594                 break;
2595         case NL80211_IFTYPE_MESH_POINT:
2596                 if (!multicast &&
2597                     compare_ether_addr(sdata->vif.addr,
2598                                        hdr->addr1) != 0) {
2599                         if (!(sdata->dev->flags & IFF_PROMISC))
2600                                 return 0;
2601
2602                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2603                 }
2604                 break;
2605         case NL80211_IFTYPE_AP_VLAN:
2606         case NL80211_IFTYPE_AP:
2607                 if (!bssid) {
2608                         if (compare_ether_addr(sdata->vif.addr,
2609                                                hdr->addr1))
2610                                 return 0;
2611                 } else if (!ieee80211_bssid_match(bssid,
2612                                         sdata->vif.addr)) {
2613                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2614                                 return 0;
2615                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2616                 }
2617                 break;
2618         case NL80211_IFTYPE_WDS:
2619                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2620                         return 0;
2621                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2622                         return 0;
2623                 break;
2624         default:
2625                 /* should never get here */
2626                 WARN_ON(1);
2627                 break;
2628         }
2629
2630         return 1;
2631 }
2632
2633 /*
2634  * This function returns whether or not the SKB
2635  * was destined for RX processing or not, which,
2636  * if consume is true, is equivalent to whether
2637  * or not the skb was consumed.
2638  */
2639 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2640                                             struct sk_buff *skb, bool consume)
2641 {
2642         struct ieee80211_local *local = rx->local;
2643         struct ieee80211_sub_if_data *sdata = rx->sdata;
2644         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2645         struct ieee80211_hdr *hdr = (void *)skb->data;
2646         int prepares;
2647
2648         rx->skb = skb;
2649         status->rx_flags |= IEEE80211_RX_RA_MATCH;
2650         prepares = prepare_for_handlers(rx, hdr);
2651
2652         if (!prepares)
2653                 return false;
2654
2655         if (status->flag & RX_FLAG_MMIC_ERROR) {
2656                 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
2657                         ieee80211_rx_michael_mic_report(hdr, rx);
2658                 return false;
2659         }
2660
2661         if (!consume) {
2662                 skb = skb_copy(skb, GFP_ATOMIC);
2663                 if (!skb) {
2664                         if (net_ratelimit())
2665                                 wiphy_debug(local->hw.wiphy,
2666                                         "failed to copy multicast frame for %s\n",
2667                                         sdata->name);
2668                         return true;
2669                 }
2670
2671                 rx->skb = skb;
2672         }
2673
2674         ieee80211_invoke_rx_handlers(rx);
2675         return true;
2676 }
2677
2678 /*
2679  * This is the actual Rx frames handler. as it blongs to Rx path it must
2680  * be called with rcu_read_lock protection.
2681  */
2682 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2683                                          struct sk_buff *skb)
2684 {
2685         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2686         struct ieee80211_local *local = hw_to_local(hw);
2687         struct ieee80211_sub_if_data *sdata;
2688         struct ieee80211_hdr *hdr;
2689         __le16 fc;
2690         struct ieee80211_rx_data rx;
2691         struct ieee80211_sub_if_data *prev;
2692         struct sta_info *sta, *tmp, *prev_sta;
2693         int err = 0;
2694
2695         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2696         memset(&rx, 0, sizeof(rx));
2697         rx.skb = skb;
2698         rx.local = local;
2699
2700         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2701                 local->dot11ReceivedFragmentCount++;
2702
2703         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2704                      test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2705                 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2706
2707         if (ieee80211_is_mgmt(fc))
2708                 err = skb_linearize(skb);
2709         else
2710                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2711
2712         if (err) {
2713                 dev_kfree_skb(skb);
2714                 return;
2715         }
2716
2717         hdr = (struct ieee80211_hdr *)skb->data;
2718         ieee80211_parse_qos(&rx);
2719         ieee80211_verify_alignment(&rx);
2720
2721         if (ieee80211_is_data(fc)) {
2722                 prev_sta = NULL;
2723
2724                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2725                         if (!prev_sta) {
2726                                 prev_sta = sta;
2727                                 continue;
2728                         }
2729
2730                         rx.sta = prev_sta;
2731                         rx.sdata = prev_sta->sdata;
2732                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
2733
2734                         prev_sta = sta;
2735                 }
2736
2737                 if (prev_sta) {
2738                         rx.sta = prev_sta;
2739                         rx.sdata = prev_sta->sdata;
2740
2741                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2742                                 return;
2743                 }
2744         }
2745
2746         prev = NULL;
2747
2748         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2749                 if (!ieee80211_sdata_running(sdata))
2750                         continue;
2751
2752                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2753                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2754                         continue;
2755
2756                 /*
2757                  * frame is destined for this interface, but if it's
2758                  * not also for the previous one we handle that after
2759                  * the loop to avoid copying the SKB once too much
2760                  */
2761
2762                 if (!prev) {
2763                         prev = sdata;
2764                         continue;
2765                 }
2766
2767                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2768                 rx.sdata = prev;
2769                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2770
2771                 prev = sdata;
2772         }
2773
2774         if (prev) {
2775                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2776                 rx.sdata = prev;
2777
2778                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2779                         return;
2780         }
2781
2782         dev_kfree_skb(skb);
2783 }
2784
2785 /*
2786  * This is the receive path handler. It is called by a low level driver when an
2787  * 802.11 MPDU is received from the hardware.
2788  */
2789 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2790 {
2791         struct ieee80211_local *local = hw_to_local(hw);
2792         struct ieee80211_rate *rate = NULL;
2793         struct ieee80211_supported_band *sband;
2794         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2795
2796         WARN_ON_ONCE(softirq_count() == 0);
2797
2798         if (WARN_ON(status->band < 0 ||
2799                     status->band >= IEEE80211_NUM_BANDS))
2800                 goto drop;
2801
2802         sband = local->hw.wiphy->bands[status->band];
2803         if (WARN_ON(!sband))
2804                 goto drop;
2805
2806         /*
2807          * If we're suspending, it is possible although not too likely
2808          * that we'd be receiving frames after having already partially
2809          * quiesced the stack. We can't process such frames then since
2810          * that might, for example, cause stations to be added or other
2811          * driver callbacks be invoked.
2812          */
2813         if (unlikely(local->quiescing || local->suspended))
2814                 goto drop;
2815
2816         /*
2817          * The same happens when we're not even started,
2818          * but that's worth a warning.
2819          */
2820         if (WARN_ON(!local->started))
2821                 goto drop;
2822
2823         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2824                 /*
2825                  * Validate the rate, unless a PLCP error means that
2826                  * we probably can't have a valid rate here anyway.
2827                  */
2828
2829                 if (status->flag & RX_FLAG_HT) {
2830                         /*
2831                          * rate_idx is MCS index, which can be [0-76]
2832                          * as documented on:
2833                          *
2834                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2835                          *
2836                          * Anything else would be some sort of driver or
2837                          * hardware error. The driver should catch hardware
2838                          * errors.
2839                          */
2840                         if (WARN((status->rate_idx < 0 ||
2841                                  status->rate_idx > 76),
2842                                  "Rate marked as an HT rate but passed "
2843                                  "status->rate_idx is not "
2844                                  "an MCS index [0-76]: %d (0x%02x)\n",
2845                                  status->rate_idx,
2846                                  status->rate_idx))
2847                                 goto drop;
2848                 } else {
2849                         if (WARN_ON(status->rate_idx < 0 ||
2850                                     status->rate_idx >= sband->n_bitrates))
2851                                 goto drop;
2852                         rate = &sband->bitrates[status->rate_idx];
2853                 }
2854         }
2855
2856         status->rx_flags = 0;
2857
2858         /*
2859          * key references and virtual interfaces are protected using RCU
2860          * and this requires that we are in a read-side RCU section during
2861          * receive processing
2862          */
2863         rcu_read_lock();
2864
2865         /*
2866          * Frames with failed FCS/PLCP checksum are not returned,
2867          * all other frames are returned without radiotap header
2868          * if it was previously present.
2869          * Also, frames with less than 16 bytes are dropped.
2870          */
2871         skb = ieee80211_rx_monitor(local, skb, rate);
2872         if (!skb) {
2873                 rcu_read_unlock();
2874                 return;
2875         }
2876
2877         __ieee80211_rx_handle_packet(hw, skb);
2878
2879         rcu_read_unlock();
2880
2881         return;
2882  drop:
2883         kfree_skb(skb);
2884 }
2885 EXPORT_SYMBOL(ieee80211_rx);
2886
2887 /* This is a version of the rx handler that can be called from hard irq
2888  * context. Post the skb on the queue and schedule the tasklet */
2889 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2890 {
2891         struct ieee80211_local *local = hw_to_local(hw);
2892
2893         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2894
2895         skb->pkt_type = IEEE80211_RX_MSG;
2896         skb_queue_tail(&local->skb_queue, skb);
2897         tasklet_schedule(&local->tasklet);
2898 }
2899 EXPORT_SYMBOL(ieee80211_rx_irqsafe);