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 <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "led.h"
  27 #include "mesh.h"
  28 #include "wep.h"
  29 #include "wpa.h"
  30 #include "tkip.h"
  31 #include "wme.h"
  32 #include "rate.h"
  33
  34 /*
  35  * monitor mode reception
  36  *
  37  * This function cleans up the SKB, i.e. it removes all the stuff
  38  * only useful for monitoring.
  39  */
  40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                            struct sk_buff *skb)
  42 {
  43         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  44
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         __pskb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         return NULL;
  53                 }
  54         }
  55
  56         if (status->vendor_radiotap_len)
  57                 __pskb_pull(skb, status->vendor_radiotap_len);
  58
  59         return skb;
  60 }
  61
  62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + status->vendor_radiotap_len);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return 1;
  73         if (unlikely(skb->len < 16 + present_fcs_len +
  74                                 status->vendor_radiotap_len))
  75                 return 1;
  76         if (ieee80211_is_ctl(hdr->frame_control) &&
  77             !ieee80211_is_pspoll(hdr->frame_control) &&
  78             !ieee80211_is_back_req(hdr->frame_control))
  79                 return 1;
  80         return 0;
  81 }
  82
  83 static int
  84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  85                             struct ieee80211_rx_status *status)
  86 {
  87         int len;
  88
  89         /* always present fields */
  90         len = sizeof(struct ieee80211_radiotap_header) + 8;
  91
  92         /* allocate extra bitmaps */
  93         if (status->vendor_radiotap_len)
  94                 len += 4;
  95         if (status->chains)
  96                 len += 4 * hweight8(status->chains);
  97
  98         if (ieee80211_have_rx_timestamp(status)) {
  99                 len = ALIGN(len, 8);
 100                 len += 8;
 101         }
 102         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 103                 len += 1;
 104
 105         /* antenna field, if we don't have per-chain info */
 106         if (!status->chains)
 107                 len += 1;
 108
 109         /* padding for RX_FLAGS if necessary */
 110         len = ALIGN(len, 2);
 111
 112         if (status->flag & RX_FLAG_HT) /* HT info */
 113                 len += 3;
 114
 115         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 116                 len = ALIGN(len, 4);
 117                 len += 8;
 118         }
 119
 120         if (status->flag & RX_FLAG_VHT) {
 121                 len = ALIGN(len, 2);
 122                 len += 12;
 123         }
 124
 125         if (status->chains) {
 126                 /* antenna and antenna signal fields */
 127                 len += 2 * hweight8(status->chains);
 128         }
 129
 130         if (status->vendor_radiotap_len) {
 131                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
 132                         status->vendor_radiotap_align = 1;
 133                 /* align standard part of vendor namespace */
 134                 len = ALIGN(len, 2);
 135                 /* allocate standard part of vendor namespace */
 136                 len += 6;
 137                 /* align vendor-defined part */
 138                 len = ALIGN(len, status->vendor_radiotap_align);
 139                 /* vendor-defined part is already in skb */
 140         }
 141
 142         return len;
 143 }
 144
 145 /*
 146  * ieee80211_add_rx_radiotap_header - add radiotap header
 147  *
 148  * add a radiotap header containing all the fields which the hardware provided.
 149  */
 150 static void
 151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 152                                  struct sk_buff *skb,
 153                                  struct ieee80211_rate *rate,
 154                                  int rtap_len, bool has_fcs)
 155 {
 156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 157         struct ieee80211_radiotap_header *rthdr;
 158         unsigned char *pos;
 159         __le32 *it_present;
 160         u32 it_present_val;
 161         u16 rx_flags = 0;
 162         u16 channel_flags = 0;
 163         int mpdulen, chain;
 164         unsigned long chains = status->chains;
 165
 166         mpdulen = skb->len;
 167         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 168                 mpdulen += FCS_LEN;
 169
 170         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 171         memset(rthdr, 0, rtap_len);
 172         it_present = &rthdr->it_present;
 173
 174         /* radiotap header, set always present flags */
 175         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
 176         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 177                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 178                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 179
 180         if (!status->chains)
 181                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 182
 183         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 184                 it_present_val |=
 185                         BIT(IEEE80211_RADIOTAP_EXT) |
 186                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 187                 put_unaligned_le32(it_present_val, it_present);
 188                 it_present++;
 189                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 190                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 191         }
 192
 193         if (status->vendor_radiotap_len) {
 194                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 195                                   BIT(IEEE80211_RADIOTAP_EXT);
 196                 put_unaligned_le32(it_present_val, it_present);
 197                 it_present++;
 198                 it_present_val = status->vendor_radiotap_bitmap;
 199         }
 200
 201         put_unaligned_le32(it_present_val, it_present);
 202
 203         pos = (void *)(it_present + 1);
 204
 205         /* the order of the following fields is important */
 206
 207         /* IEEE80211_RADIOTAP_TSFT */
 208         if (ieee80211_have_rx_timestamp(status)) {
 209                 /* padding */
 210                 while ((pos - (u8 *)rthdr) & 7)
 211                         *pos++ = 0;
 212                 put_unaligned_le64(
 213                         ieee80211_calculate_rx_timestamp(local, status,
 214                                                          mpdulen, 0),
 215                         pos);
 216                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 217                 pos += 8;
 218         }
 219
 220         /* IEEE80211_RADIOTAP_FLAGS */
 221         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 222                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 223         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 224                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 225         if (status->flag & RX_FLAG_SHORTPRE)
 226                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 227         pos++;
 228
 229         /* IEEE80211_RADIOTAP_RATE */
 230         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 231                 /*
 232                  * Without rate information don't add it. If we have,
 233                  * MCS information is a separate field in radiotap,
 234                  * added below. The byte here is needed as padding
 235                  * for the channel though, so initialise it to 0.
 236                  */
 237                 *pos = 0;
 238         } else {
 239                 int shift = 0;
 240                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 241                 if (status->flag & RX_FLAG_10MHZ)
 242                         shift = 1;
 243                 else if (status->flag & RX_FLAG_5MHZ)
 244                         shift = 2;
 245                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 246         }
 247         pos++;
 248
 249         /* IEEE80211_RADIOTAP_CHANNEL */
 250         put_unaligned_le16(status->freq, pos);
 251         pos += 2;
 252         if (status->flag & RX_FLAG_10MHZ)
 253                 channel_flags |= IEEE80211_CHAN_HALF;
 254         else if (status->flag & RX_FLAG_5MHZ)
 255                 channel_flags |= IEEE80211_CHAN_QUARTER;
 256
 257         if (status->band == IEEE80211_BAND_5GHZ)
 258                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 259         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 260                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 261         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 262                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 263         else if (rate)
 264                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 265         else
 266                 channel_flags |= IEEE80211_CHAN_2GHZ;
 267         put_unaligned_le16(channel_flags, pos);
 268         pos += 2;
 269
 270         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 271         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 272             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 273                 *pos = status->signal;
 274                 rthdr->it_present |=
 275                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 276                 pos++;
 277         }
 278
 279         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 280
 281         if (!status->chains) {
 282                 /* IEEE80211_RADIOTAP_ANTENNA */
 283                 *pos = status->antenna;
 284                 pos++;
 285         }
 286
 287         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 288
 289         /* IEEE80211_RADIOTAP_RX_FLAGS */
 290         /* ensure 2 byte alignment for the 2 byte field as required */
 291         if ((pos - (u8 *)rthdr) & 1)
 292                 *pos++ = 0;
 293         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 294                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 295         put_unaligned_le16(rx_flags, pos);
 296         pos += 2;
 297
 298         if (status->flag & RX_FLAG_HT) {
 299                 unsigned int stbc;
 300
 301                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 302                 *pos++ = local->hw.radiotap_mcs_details;
 303                 *pos = 0;
 304                 if (status->flag & RX_FLAG_SHORT_GI)
 305                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 306                 if (status->flag & RX_FLAG_40MHZ)
 307                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 308                 if (status->flag & RX_FLAG_HT_GF)
 309                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 310                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 311                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 312                 pos++;
 313                 *pos++ = status->rate_idx;
 314         }
 315
 316         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 317                 u16 flags = 0;
 318
 319                 /* ensure 4 byte alignment */
 320                 while ((pos - (u8 *)rthdr) & 3)
 321                         pos++;
 322                 rthdr->it_present |=
 323                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 324                 put_unaligned_le32(status->ampdu_reference, pos);
 325                 pos += 4;
 326                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 327                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 328                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 329                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 330                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 331                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 332                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 333                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 334                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 335                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 336                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 337                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 338                 put_unaligned_le16(flags, pos);
 339                 pos += 2;
 340                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 341                         *pos++ = status->ampdu_delimiter_crc;
 342                 else
 343                         *pos++ = 0;
 344                 *pos++ = 0;
 345         }
 346
 347         if (status->flag & RX_FLAG_VHT) {
 348                 u16 known = local->hw.radiotap_vht_details;
 349
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 351                 /* known field - how to handle 80+80? */
 352                 if (status->flag & RX_FLAG_80P80MHZ)
 353                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 354                 put_unaligned_le16(known, pos);
 355                 pos += 2;
 356                 /* flags */
 357                 if (status->flag & RX_FLAG_SHORT_GI)
 358                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 359                 pos++;
 360                 /* bandwidth */
 361                 if (status->flag & RX_FLAG_80MHZ)
 362                         *pos++ = 4;
 363                 else if (status->flag & RX_FLAG_80P80MHZ)
 364                         *pos++ = 0; /* marked not known above */
 365                 else if (status->flag & RX_FLAG_160MHZ)
 366                         *pos++ = 11;
 367                 else if (status->flag & RX_FLAG_40MHZ)
 368                         *pos++ = 1;
 369                 else /* 20 MHz */
 370                         *pos++ = 0;
 371                 /* MCS/NSS */
 372                 *pos = (status->rate_idx << 4) | status->vht_nss;
 373                 pos += 4;
 374                 /* coding field */
 375                 pos++;
 376                 /* group ID */
 377                 pos++;
 378                 /* partial_aid */
 379                 pos += 2;
 380         }
 381
 382         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 383                 *pos++ = status->chain_signal[chain];
 384                 *pos++ = chain;
 385         }
 386
 387         if (status->vendor_radiotap_len) {
 388                 /* ensure 2 byte alignment for the vendor field as required */
 389                 if ((pos - (u8 *)rthdr) & 1)
 390                         *pos++ = 0;
 391                 *pos++ = status->vendor_radiotap_oui[0];
 392                 *pos++ = status->vendor_radiotap_oui[1];
 393                 *pos++ = status->vendor_radiotap_oui[2];
 394                 *pos++ = status->vendor_radiotap_subns;
 395                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 396                 pos += 2;
 397                 /* align the actual payload as requested */
 398                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 399                         *pos++ = 0;
 400         }
 401 }
 402
 403 /*
 404  * This function copies a received frame to all monitor interfaces and
 405  * returns a cleaned-up SKB that no longer includes the FCS nor the
 406  * radiotap header the driver might have added.
 407  */
 408 static struct sk_buff *
 409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 410                      struct ieee80211_rate *rate)
 411 {
 412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 413         struct ieee80211_sub_if_data *sdata;
 414         int needed_headroom;
 415         struct sk_buff *skb, *skb2;
 416         struct net_device *prev_dev = NULL;
 417         int present_fcs_len = 0;
 418
 419         /*
 420          * First, we may need to make a copy of the skb because
 421          *  (1) we need to modify it for radiotap (if not present), and
 422          *  (2) the other RX handlers will modify the skb we got.
 423          *
 424          * We don't need to, of course, if we aren't going to return
 425          * the SKB because it has a bad FCS/PLCP checksum.
 426          */
 427
 428         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 429                 present_fcs_len = FCS_LEN;
 430
 431         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 432         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 433                 dev_kfree_skb(origskb);
 434                 return NULL;
 435         }
 436
 437         if (!local->monitors) {
 438                 if (should_drop_frame(origskb, present_fcs_len)) {
 439                         dev_kfree_skb(origskb);
 440                         return NULL;
 441                 }
 442
 443                 return remove_monitor_info(local, origskb);
 444         }
 445
 446         /* room for the radiotap header based on driver features */
 447         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 448
 449         if (should_drop_frame(origskb, present_fcs_len)) {
 450                 /* only need to expand headroom if necessary */
 451                 skb = origskb;
 452                 origskb = NULL;
 453
 454                 /*
 455                  * This shouldn't trigger often because most devices have an
 456                  * RX header they pull before we get here, and that should
 457                  * be big enough for our radiotap information. We should
 458                  * probably export the length to drivers so that we can have
 459                  * them allocate enough headroom to start with.
 460                  */
 461                 if (skb_headroom(skb) < needed_headroom &&
 462                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 463                         dev_kfree_skb(skb);
 464                         return NULL;
 465                 }
 466         } else {
 467                 /*
 468                  * Need to make a copy and possibly remove radiotap header
 469                  * and FCS from the original.
 470                  */
 471                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 472
 473                 origskb = remove_monitor_info(local, origskb);
 474
 475                 if (!skb)
 476                         return origskb;
 477         }
 478
 479         /* prepend radiotap information */
 480         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 481                                          true);
 482
 483         skb_reset_mac_header(skb);
 484         skb->ip_summed = CHECKSUM_UNNECESSARY;
 485         skb->pkt_type = PACKET_OTHERHOST;
 486         skb->protocol = htons(ETH_P_802_2);
 487
 488         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 489                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 490                         continue;
 491
 492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 493                         continue;
 494
 495                 if (!ieee80211_sdata_running(sdata))
 496                         continue;
 497
 498                 if (prev_dev) {
 499                         skb2 = skb_clone(skb, GFP_ATOMIC);
 500                         if (skb2) {
 501                                 skb2->dev = prev_dev;
 502                                 netif_receive_skb(skb2);
 503                         }
 504                 }
 505
 506                 prev_dev = sdata->dev;
 507                 sdata->dev->stats.rx_packets++;
 508                 sdata->dev->stats.rx_bytes += skb->len;
 509         }
 510
 511         if (prev_dev) {
 512                 skb->dev = prev_dev;
 513                 netif_receive_skb(skb);
 514         } else
 515                 dev_kfree_skb(skb);
 516
 517         return origskb;
 518 }
 519
 520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 521 {
 522         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 524         int tid, seqno_idx, security_idx;
 525
 526         /* does the frame have a qos control field? */
 527         if (ieee80211_is_data_qos(hdr->frame_control)) {
 528                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 529                 /* frame has qos control */
 530                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 531                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 532                         status->rx_flags |= IEEE80211_RX_AMSDU;
 533
 534                 seqno_idx = tid;
 535                 security_idx = tid;
 536         } else {
 537                 /*
 538                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 539                  *
 540                  *      Sequence numbers for management frames, QoS data
 541                  *      frames with a broadcast/multicast address in the
 542                  *      Address 1 field, and all non-QoS data frames sent
 543                  *      by QoS STAs are assigned using an additional single
 544                  *      modulo-4096 counter, [...]
 545                  *
 546                  * We also use that counter for non-QoS STAs.
 547                  */
 548                 seqno_idx = IEEE80211_NUM_TIDS;
 549                 security_idx = 0;
 550                 if (ieee80211_is_mgmt(hdr->frame_control))
 551                         security_idx = IEEE80211_NUM_TIDS;
 552                 tid = 0;
 553         }
 554
 555         rx->seqno_idx = seqno_idx;
 556         rx->security_idx = security_idx;
 557         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 558          * For now, set skb->priority to 0 for other cases. */
 559         rx->skb->priority = (tid > 7) ? 0 : tid;
 560 }
 561
 562 /**
 563  * DOC: Packet alignment
 564  *
 565  * Drivers always need to pass packets that are aligned to two-byte boundaries
 566  * to the stack.
 567  *
 568  * Additionally, should, if possible, align the payload data in a way that
 569  * guarantees that the contained IP header is aligned to a four-byte
 570  * boundary. In the case of regular frames, this simply means aligning the
 571  * payload to a four-byte boundary (because either the IP header is directly
 572  * contained, or IV/RFC1042 headers that have a length divisible by four are
 573  * in front of it).  If the payload data is not properly aligned and the
 574  * architecture doesn't support efficient unaligned operations, mac80211
 575  * will align the data.
 576  *
 577  * With A-MSDU frames, however, the payload data address must yield two modulo
 578  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 579  * push the IP header further back to a multiple of four again. Thankfully, the
 580  * specs were sane enough this time around to require padding each A-MSDU
 581  * subframe to a length that is a multiple of four.
 582  *
 583  * Padding like Atheros hardware adds which is between the 802.11 header and
 584  * the payload is not supported, the driver is required to move the 802.11
 585  * header to be directly in front of the payload in that case.
 586  */
 587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 588 {
 589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 590         WARN_ONCE((unsigned long)rx->skb->data & 1,
 591                   "unaligned packet at 0x%p\n", rx->skb->data);
 592 #endif
 593 }
 594
 595
 596 /* rx handlers */
 597
 598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 599 {
 600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 601
 602         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 603                 return 0;
 604
 605         return ieee80211_is_robust_mgmt_frame(hdr);
 606 }
 607
 608
 609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 610 {
 611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 612
 613         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 614                 return 0;
 615
 616         return ieee80211_is_robust_mgmt_frame(hdr);
 617 }
 618
 619
 620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 622 {
 623         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 624         struct ieee80211_mmie *mmie;
 625
 626         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 627                 return -1;
 628
 629         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 630                 return -1; /* not a robust management frame */
 631
 632         mmie = (struct ieee80211_mmie *)
 633                 (skb->data + skb->len - sizeof(*mmie));
 634         if (mmie->element_id != WLAN_EID_MMIE ||
 635             mmie->length != sizeof(*mmie) - 2)
 636                 return -1;
 637
 638         return le16_to_cpu(mmie->key_id);
 639 }
 640
 641 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 642 {
 643         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 644         char *dev_addr = rx->sdata->vif.addr;
 645
 646         if (ieee80211_is_data(hdr->frame_control)) {
 647                 if (is_multicast_ether_addr(hdr->addr1)) {
 648                         if (ieee80211_has_tods(hdr->frame_control) ||
 649                             !ieee80211_has_fromds(hdr->frame_control))
 650                                 return RX_DROP_MONITOR;
 651                         if (ether_addr_equal(hdr->addr3, dev_addr))
 652                                 return RX_DROP_MONITOR;
 653                 } else {
 654                         if (!ieee80211_has_a4(hdr->frame_control))
 655                                 return RX_DROP_MONITOR;
 656                         if (ether_addr_equal(hdr->addr4, dev_addr))
 657                                 return RX_DROP_MONITOR;
 658                 }
 659         }
 660
 661         /* If there is not an established peer link and this is not a peer link
 662          * establisment frame, beacon or probe, drop the frame.
 663          */
 664
 665         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 666                 struct ieee80211_mgmt *mgmt;
 667
 668                 if (!ieee80211_is_mgmt(hdr->frame_control))
 669                         return RX_DROP_MONITOR;
 670
 671                 if (ieee80211_is_action(hdr->frame_control)) {
 672                         u8 category;
 673
 674                         /* make sure category field is present */
 675                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 676                                 return RX_DROP_MONITOR;
 677
 678                         mgmt = (struct ieee80211_mgmt *)hdr;
 679                         category = mgmt->u.action.category;
 680                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 681                             category != WLAN_CATEGORY_SELF_PROTECTED)
 682                                 return RX_DROP_MONITOR;
 683                         return RX_CONTINUE;
 684                 }
 685
 686                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 687                     ieee80211_is_probe_resp(hdr->frame_control) ||
 688                     ieee80211_is_beacon(hdr->frame_control) ||
 689                     ieee80211_is_auth(hdr->frame_control))
 690                         return RX_CONTINUE;
 691
 692                 return RX_DROP_MONITOR;
 693         }
 694
 695         return RX_CONTINUE;
 696 }
 697
 698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 699                                             struct tid_ampdu_rx *tid_agg_rx,
 700                                             int index,
 701                                             struct sk_buff_head *frames)
 702 {
 703         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 704         struct ieee80211_rx_status *status;
 705
 706         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 707
 708         if (!skb)
 709                 goto no_frame;
 710
 711         /* release the frame from the reorder ring buffer */
 712         tid_agg_rx->stored_mpdu_num--;
 713         tid_agg_rx->reorder_buf[index] = NULL;
 714         status = IEEE80211_SKB_RXCB(skb);
 715         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 716         __skb_queue_tail(frames, skb);
 717
 718 no_frame:
 719         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 720 }
 721
 722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 723                                              struct tid_ampdu_rx *tid_agg_rx,
 724                                              u16 head_seq_num,
 725                                              struct sk_buff_head *frames)
 726 {
 727         int index;
 728
 729         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 730
 731         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 732                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 733                                          tid_agg_rx->ssn) %
 734                                                         tid_agg_rx->buf_size;
 735                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 736                                                 frames);
 737         }
 738 }
 739
 740 /*
 741  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 742  * the skb was added to the buffer longer than this time ago, the earlier
 743  * frames that have not yet been received are assumed to be lost and the skb
 744  * can be released for processing. This may also release other skb's from the
 745  * reorder buffer if there are no additional gaps between the frames.
 746  *
 747  * Callers must hold tid_agg_rx->reorder_lock.
 748  */
 749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 750
 751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 752                                           struct tid_ampdu_rx *tid_agg_rx,
 753                                           struct sk_buff_head *frames)
 754 {
 755         int index, j;
 756
 757         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 758
 759         /* release the buffer until next missing frame */
 760         index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 761                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 762         if (!tid_agg_rx->reorder_buf[index] &&
 763             tid_agg_rx->stored_mpdu_num) {
 764                 /*
 765                  * No buffers ready to be released, but check whether any
 766                  * frames in the reorder buffer have timed out.
 767                  */
 768                 int skipped = 1;
 769                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 770                      j = (j + 1) % tid_agg_rx->buf_size) {
 771                         if (!tid_agg_rx->reorder_buf[j]) {
 772                                 skipped++;
 773                                 continue;
 774                         }
 775                         if (skipped &&
 776                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 777                                         HT_RX_REORDER_BUF_TIMEOUT))
 778                                 goto set_release_timer;
 779
 780                         ht_dbg_ratelimited(sdata,
 781                                            "release an RX reorder frame due to timeout on earlier frames\n");
 782                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 783                                                         frames);
 784
 785                         /*
 786                          * Increment the head seq# also for the skipped slots.
 787                          */
 788                         tid_agg_rx->head_seq_num =
 789                                 (tid_agg_rx->head_seq_num +
 790                                  skipped) & IEEE80211_SN_MASK;
 791                         skipped = 0;
 792                 }
 793         } else while (tid_agg_rx->reorder_buf[index]) {
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 797                                          tid_agg_rx->ssn) %
 798                                                         tid_agg_rx->buf_size;
 799         }
 800
 801         if (tid_agg_rx->stored_mpdu_num) {
 802                 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 803                                              tid_agg_rx->ssn) %
 804                                                         tid_agg_rx->buf_size;
 805
 806                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 807                      j = (j + 1) % tid_agg_rx->buf_size) {
 808                         if (tid_agg_rx->reorder_buf[j])
 809                                 break;
 810                 }
 811
 812  set_release_timer:
 813
 814                 mod_timer(&tid_agg_rx->reorder_timer,
 815                           tid_agg_rx->reorder_time[j] + 1 +
 816                           HT_RX_REORDER_BUF_TIMEOUT);
 817         } else {
 818                 del_timer(&tid_agg_rx->reorder_timer);
 819         }
 820 }
 821
 822 /*
 823  * As this function belongs to the RX path it must be under
 824  * rcu_read_lock protection. It returns false if the frame
 825  * can be processed immediately, true if it was consumed.
 826  */
 827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 828                                              struct tid_ampdu_rx *tid_agg_rx,
 829                                              struct sk_buff *skb,
 830                                              struct sk_buff_head *frames)
 831 {
 832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 833         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 834         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 835         u16 head_seq_num, buf_size;
 836         int index;
 837         bool ret = true;
 838
 839         spin_lock(&tid_agg_rx->reorder_lock);
 840
 841         buf_size = tid_agg_rx->buf_size;
 842         head_seq_num = tid_agg_rx->head_seq_num;
 843
 844         /* frame with out of date sequence number */
 845         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 846                 dev_kfree_skb(skb);
 847                 goto out;
 848         }
 849
 850         /*
 851          * If frame the sequence number exceeds our buffering window
 852          * size release some previous frames to make room for this one.
 853          */
 854         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 855                 head_seq_num = ieee80211_sn_inc(
 856                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 857                 /* release stored frames up to new head to stack */
 858                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 859                                                  head_seq_num, frames);
 860         }
 861
 862         /* Now the new frame is always in the range of the reordering buffer */
 863
 864         index = ieee80211_sn_sub(mpdu_seq_num,
 865                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 866
 867         /* check if we already stored this frame */
 868         if (tid_agg_rx->reorder_buf[index]) {
 869                 dev_kfree_skb(skb);
 870                 goto out;
 871         }
 872
 873         /*
 874          * If the current MPDU is in the right order and nothing else
 875          * is stored we can process it directly, no need to buffer it.
 876          * If it is first but there's something stored, we may be able
 877          * to release frames after this one.
 878          */
 879         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 880             tid_agg_rx->stored_mpdu_num == 0) {
 881                 tid_agg_rx->head_seq_num =
 882                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 883                 ret = false;
 884                 goto out;
 885         }
 886
 887         /* put the frame in the reordering buffer */
 888         tid_agg_rx->reorder_buf[index] = skb;
 889         tid_agg_rx->reorder_time[index] = jiffies;
 890         tid_agg_rx->stored_mpdu_num++;
 891         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 892
 893  out:
 894         spin_unlock(&tid_agg_rx->reorder_lock);
 895         return ret;
 896 }
 897
 898 /*
 899  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 900  * true if the MPDU was buffered, false if it should be processed.
 901  */
 902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 903                                        struct sk_buff_head *frames)
 904 {
 905         struct sk_buff *skb = rx->skb;
 906         struct ieee80211_local *local = rx->local;
 907         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 908         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 909         struct sta_info *sta = rx->sta;
 910         struct tid_ampdu_rx *tid_agg_rx;
 911         u16 sc;
 912         u8 tid, ack_policy;
 913
 914         if (!ieee80211_is_data_qos(hdr->frame_control))
 915                 goto dont_reorder;
 916
 917         /*
 918          * filter the QoS data rx stream according to
 919          * STA/TID and check if this STA/TID is on aggregation
 920          */
 921
 922         if (!sta)
 923                 goto dont_reorder;
 924
 925         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 926                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 927         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 928
 929         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 930         if (!tid_agg_rx)
 931                 goto dont_reorder;
 932
 933         /* qos null data frames are excluded */
 934         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 935                 goto dont_reorder;
 936
 937         /* not part of a BA session */
 938         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 939             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 940                 goto dont_reorder;
 941
 942         /* not actually part of this BA session */
 943         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 944                 goto dont_reorder;
 945
 946         /* new, potentially un-ordered, ampdu frame - process it */
 947
 948         /* reset session timer */
 949         if (tid_agg_rx->timeout)
 950                 tid_agg_rx->last_rx = jiffies;
 951
 952         /* if this mpdu is fragmented - terminate rx aggregation session */
 953         sc = le16_to_cpu(hdr->seq_ctrl);
 954         if (sc & IEEE80211_SCTL_FRAG) {
 955                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 956                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 957                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 958                 return;
 959         }
 960
 961         /*
 962          * No locking needed -- we will only ever process one
 963          * RX packet at a time, and thus own tid_agg_rx. All
 964          * other code manipulating it needs to (and does) make
 965          * sure that we cannot get to it any more before doing
 966          * anything with it.
 967          */
 968         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 969                                              frames))
 970                 return;
 971
 972  dont_reorder:
 973         __skb_queue_tail(frames, skb);
 974 }
 975
 976 static ieee80211_rx_result debug_noinline
 977 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 978 {
 979         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 980         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 981
 982         /*
 983          * Drop duplicate 802.11 retransmissions
 984          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 985          */
 986         if (rx->skb->len >= 24 && rx->sta &&
 987             !ieee80211_is_ctl(hdr->frame_control) &&
 988             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
 989             !is_multicast_ether_addr(hdr->addr1)) {
 990                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 991                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 992                              hdr->seq_ctrl)) {
 993                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 994                                 rx->local->dot11FrameDuplicateCount++;
 995                                 rx->sta->num_duplicates++;
 996                         }
 997                         return RX_DROP_UNUSABLE;
 998                 } else
 999                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1000         }
1001
1002         if (unlikely(rx->skb->len < 16)) {
1003                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1004                 return RX_DROP_MONITOR;
1005         }
1006
1007         /* Drop disallowed frame classes based on STA auth/assoc state;
1008          * IEEE 802.11, Chap 5.5.
1009          *
1010          * mac80211 filters only based on association state, i.e. it drops
1011          * Class 3 frames from not associated stations. hostapd sends
1012          * deauth/disassoc frames when needed. In addition, hostapd is
1013          * responsible for filtering on both auth and assoc states.
1014          */
1015
1016         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1017                 return ieee80211_rx_mesh_check(rx);
1018
1019         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1020                       ieee80211_is_pspoll(hdr->frame_control)) &&
1021                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1022                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1023                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1024                 /*
1025                  * accept port control frames from the AP even when it's not
1026                  * yet marked ASSOC to prevent a race where we don't set the
1027                  * assoc bit quickly enough before it sends the first frame
1028                  */
1029                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1030                     ieee80211_is_data_present(hdr->frame_control)) {
1031                         unsigned int hdrlen;
1032                         __be16 ethertype;
1033
1034                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1035
1036                         if (rx->skb->len < hdrlen + 8)
1037                                 return RX_DROP_MONITOR;
1038
1039                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1040                         if (ethertype == rx->sdata->control_port_protocol)
1041                                 return RX_CONTINUE;
1042                 }
1043
1044                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1045                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1046                                                hdr->addr2,
1047                                                GFP_ATOMIC))
1048                         return RX_DROP_UNUSABLE;
1049
1050                 return RX_DROP_MONITOR;
1051         }
1052
1053         return RX_CONTINUE;
1054 }
1055
1056
1057 static ieee80211_rx_result debug_noinline
1058 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1059 {
1060         struct ieee80211_local *local;
1061         struct ieee80211_hdr *hdr;
1062         struct sk_buff *skb;
1063
1064         local = rx->local;
1065         skb = rx->skb;
1066         hdr = (struct ieee80211_hdr *) skb->data;
1067
1068         if (!local->pspolling)
1069                 return RX_CONTINUE;
1070
1071         if (!ieee80211_has_fromds(hdr->frame_control))
1072                 /* this is not from AP */
1073                 return RX_CONTINUE;
1074
1075         if (!ieee80211_is_data(hdr->frame_control))
1076                 return RX_CONTINUE;
1077
1078         if (!ieee80211_has_moredata(hdr->frame_control)) {
1079                 /* AP has no more frames buffered for us */
1080                 local->pspolling = false;
1081                 return RX_CONTINUE;
1082         }
1083
1084         /* more data bit is set, let's request a new frame from the AP */
1085         ieee80211_send_pspoll(local, rx->sdata);
1086
1087         return RX_CONTINUE;
1088 }
1089
1090 static void sta_ps_start(struct sta_info *sta)
1091 {
1092         struct ieee80211_sub_if_data *sdata = sta->sdata;
1093         struct ieee80211_local *local = sdata->local;
1094         struct ps_data *ps;
1095
1096         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1097             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1098                 ps = &sdata->bss->ps;
1099         else
1100                 return;
1101
1102         atomic_inc(&ps->num_sta_ps);
1103         set_sta_flag(sta, WLAN_STA_PS_STA);
1104         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1105                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1106         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1107                sta->sta.addr, sta->sta.aid);
1108 }
1109
1110 static void sta_ps_end(struct sta_info *sta)
1111 {
1112         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1113                sta->sta.addr, sta->sta.aid);
1114
1115         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1116                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1117                        sta->sta.addr, sta->sta.aid);
1118                 return;
1119         }
1120
1121         ieee80211_sta_ps_deliver_wakeup(sta);
1122 }
1123
1124 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1125 {
1126         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1127         bool in_ps;
1128
1129         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1130
1131         /* Don't let the same PS state be set twice */
1132         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1133         if ((start && in_ps) || (!start && !in_ps))
1134                 return -EINVAL;
1135
1136         if (start)
1137                 sta_ps_start(sta_inf);
1138         else
1139                 sta_ps_end(sta_inf);
1140
1141         return 0;
1142 }
1143 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1144
1145 static ieee80211_rx_result debug_noinline
1146 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1147 {
1148         struct ieee80211_sub_if_data *sdata = rx->sdata;
1149         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1150         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1151         int tid, ac;
1152
1153         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1154                 return RX_CONTINUE;
1155
1156         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1157             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1158                 return RX_CONTINUE;
1159
1160         /*
1161          * The device handles station powersave, so don't do anything about
1162          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1163          * it to mac80211 since they're handled.)
1164          */
1165         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1166                 return RX_CONTINUE;
1167
1168         /*
1169          * Don't do anything if the station isn't already asleep. In
1170          * the uAPSD case, the station will probably be marked asleep,
1171          * in the PS-Poll case the station must be confused ...
1172          */
1173         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1174                 return RX_CONTINUE;
1175
1176         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1177                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1178                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1179                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1180                         else
1181                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1182                 }
1183
1184                 /* Free PS Poll skb here instead of returning RX_DROP that would
1185                  * count as an dropped frame. */
1186                 dev_kfree_skb(rx->skb);
1187
1188                 return RX_QUEUED;
1189         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1190                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1191                    ieee80211_has_pm(hdr->frame_control) &&
1192                    (ieee80211_is_data_qos(hdr->frame_control) ||
1193                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1194                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1195                 ac = ieee802_1d_to_ac[tid & 7];
1196
1197                 /*
1198                  * If this AC is not trigger-enabled do nothing.
1199                  *
1200                  * NB: This could/should check a separate bitmap of trigger-
1201                  * enabled queues, but for now we only implement uAPSD w/o
1202                  * TSPEC changes to the ACs, so they're always the same.
1203                  */
1204                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1205                         return RX_CONTINUE;
1206
1207                 /* if we are in a service period, do nothing */
1208                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1209                         return RX_CONTINUE;
1210
1211                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1212                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1213                 else
1214                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1215         }
1216
1217         return RX_CONTINUE;
1218 }
1219
1220 static ieee80211_rx_result debug_noinline
1221 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1222 {
1223         struct sta_info *sta = rx->sta;
1224         struct sk_buff *skb = rx->skb;
1225         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1226         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1227         int i;
1228
1229         if (!sta)
1230                 return RX_CONTINUE;
1231
1232         /*
1233          * Update last_rx only for IBSS packets which are for the current
1234          * BSSID and for station already AUTHORIZED to avoid keeping the
1235          * current IBSS network alive in cases where other STAs start
1236          * using different BSSID. This will also give the station another
1237          * chance to restart the authentication/authorization in case
1238          * something went wrong the first time.
1239          */
1240         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1241                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1242                                                 NL80211_IFTYPE_ADHOC);
1243                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1244                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1245                         sta->last_rx = jiffies;
1246                         if (ieee80211_is_data(hdr->frame_control)) {
1247                                 sta->last_rx_rate_idx = status->rate_idx;
1248                                 sta->last_rx_rate_flag = status->flag;
1249                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1250                         }
1251                 }
1252         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1253                 /*
1254                  * Mesh beacons will update last_rx when if they are found to
1255                  * match the current local configuration when processed.
1256                  */
1257                 sta->last_rx = jiffies;
1258                 if (ieee80211_is_data(hdr->frame_control)) {
1259                         sta->last_rx_rate_idx = status->rate_idx;
1260                         sta->last_rx_rate_flag = status->flag;
1261                         sta->last_rx_rate_vht_nss = status->vht_nss;
1262                 }
1263         }
1264
1265         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1266                 return RX_CONTINUE;
1267
1268         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1269                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1270
1271         sta->rx_fragments++;
1272         sta->rx_bytes += rx->skb->len;
1273         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1274                 sta->last_signal = status->signal;
1275                 ewma_add(&sta->avg_signal, -status->signal);
1276         }
1277
1278         if (status->chains) {
1279                 sta->chains = status->chains;
1280                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1281                         int signal = status->chain_signal[i];
1282
1283                         if (!(status->chains & BIT(i)))
1284                                 continue;
1285
1286                         sta->chain_signal_last[i] = signal;
1287                         ewma_add(&sta->chain_signal_avg[i], -signal);
1288                 }
1289         }
1290
1291         /*
1292          * Change STA power saving mode only at the end of a frame
1293          * exchange sequence.
1294          */
1295         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1296             !ieee80211_has_morefrags(hdr->frame_control) &&
1297             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1298             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1299              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1300                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1301                         /*
1302                          * Ignore doze->wake transitions that are
1303                          * indicated by non-data frames, the standard
1304                          * is unclear here, but for example going to
1305                          * PS mode and then scanning would cause a
1306                          * doze->wake transition for the probe request,
1307                          * and that is clearly undesirable.
1308                          */
1309                         if (ieee80211_is_data(hdr->frame_control) &&
1310                             !ieee80211_has_pm(hdr->frame_control))
1311                                 sta_ps_end(sta);
1312                 } else {
1313                         if (ieee80211_has_pm(hdr->frame_control))
1314                                 sta_ps_start(sta);
1315                 }
1316         }
1317
1318         /* mesh power save support */
1319         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1320                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1321
1322         /*
1323          * Drop (qos-)data::nullfunc frames silently, since they
1324          * are used only to control station power saving mode.
1325          */
1326         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1327             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1328                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1329
1330                 /*
1331                  * If we receive a 4-addr nullfunc frame from a STA
1332                  * that was not moved to a 4-addr STA vlan yet send
1333                  * the event to userspace and for older hostapd drop
1334                  * the frame to the monitor interface.
1335                  */
1336                 if (ieee80211_has_a4(hdr->frame_control) &&
1337                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1338                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1339                       !rx->sdata->u.vlan.sta))) {
1340                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1341                                 cfg80211_rx_unexpected_4addr_frame(
1342                                         rx->sdata->dev, sta->sta.addr,
1343                                         GFP_ATOMIC);
1344                         return RX_DROP_MONITOR;
1345                 }
1346                 /*
1347                  * Update counter and free packet here to avoid
1348                  * counting this as a dropped packed.
1349                  */
1350                 sta->rx_packets++;
1351                 dev_kfree_skb(rx->skb);
1352                 return RX_QUEUED;
1353         }
1354
1355         return RX_CONTINUE;
1356 } /* ieee80211_rx_h_sta_process */
1357
1358 static ieee80211_rx_result debug_noinline
1359 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1360 {
1361         struct sk_buff *skb = rx->skb;
1362         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1363         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1364         int keyidx;
1365         int hdrlen;
1366         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1367         struct ieee80211_key *sta_ptk = NULL;
1368         int mmie_keyidx = -1;
1369         __le16 fc;
1370
1371         /*
1372          * Key selection 101
1373          *
1374          * There are four types of keys:
1375          *  - GTK (group keys)
1376          *  - IGTK (group keys for management frames)
1377          *  - PTK (pairwise keys)
1378          *  - STK (station-to-station pairwise keys)
1379          *
1380          * When selecting a key, we have to distinguish between multicast
1381          * (including broadcast) and unicast frames, the latter can only
1382          * use PTKs and STKs while the former always use GTKs and IGTKs.
1383          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1384          * unicast frames can also use key indices like GTKs. Hence, if we
1385          * don't have a PTK/STK we check the key index for a WEP key.
1386          *
1387          * Note that in a regular BSS, multicast frames are sent by the
1388          * AP only, associated stations unicast the frame to the AP first
1389          * which then multicasts it on their behalf.
1390          *
1391          * There is also a slight problem in IBSS mode: GTKs are negotiated
1392          * with each station, that is something we don't currently handle.
1393          * The spec seems to expect that one negotiates the same key with
1394          * every station but there's no such requirement; VLANs could be
1395          * possible.
1396          */
1397
1398         /*
1399          * No point in finding a key and decrypting if the frame is neither
1400          * addressed to us nor a multicast frame.
1401          */
1402         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1403                 return RX_CONTINUE;
1404
1405         /* start without a key */
1406         rx->key = NULL;
1407
1408         if (rx->sta)
1409                 sta_ptk = rcu_dereference(rx->sta->ptk);
1410
1411         fc = hdr->frame_control;
1412
1413         if (!ieee80211_has_protected(fc))
1414                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1415
1416         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1417                 rx->key = sta_ptk;
1418                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1419                     (status->flag & RX_FLAG_IV_STRIPPED))
1420                         return RX_CONTINUE;
1421                 /* Skip decryption if the frame is not protected. */
1422                 if (!ieee80211_has_protected(fc))
1423                         return RX_CONTINUE;
1424         } else if (mmie_keyidx >= 0) {
1425                 /* Broadcast/multicast robust management frame / BIP */
1426                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1427                     (status->flag & RX_FLAG_IV_STRIPPED))
1428                         return RX_CONTINUE;
1429
1430                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1431                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1432                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1433                 if (rx->sta)
1434                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1435                 if (!rx->key)
1436                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1437         } else if (!ieee80211_has_protected(fc)) {
1438                 /*
1439                  * The frame was not protected, so skip decryption. However, we
1440                  * need to set rx->key if there is a key that could have been
1441                  * used so that the frame may be dropped if encryption would
1442                  * have been expected.
1443                  */
1444                 struct ieee80211_key *key = NULL;
1445                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1446                 int i;
1447
1448                 if (ieee80211_is_mgmt(fc) &&
1449                     is_multicast_ether_addr(hdr->addr1) &&
1450                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1451                         rx->key = key;
1452                 else {
1453                         if (rx->sta) {
1454                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1455                                         key = rcu_dereference(rx->sta->gtk[i]);
1456                                         if (key)
1457                                                 break;
1458                                 }
1459                         }
1460                         if (!key) {
1461                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1462                                         key = rcu_dereference(sdata->keys[i]);
1463                                         if (key)
1464                                                 break;
1465                                 }
1466                         }
1467                         if (key)
1468                                 rx->key = key;
1469                 }
1470                 return RX_CONTINUE;
1471         } else {
1472                 u8 keyid;
1473                 /*
1474                  * The device doesn't give us the IV so we won't be
1475                  * able to look up the key. That's ok though, we
1476                  * don't need to decrypt the frame, we just won't
1477                  * be able to keep statistics accurate.
1478                  * Except for key threshold notifications, should
1479                  * we somehow allow the driver to tell us which key
1480                  * the hardware used if this flag is set?
1481                  */
1482                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1483                     (status->flag & RX_FLAG_IV_STRIPPED))
1484                         return RX_CONTINUE;
1485
1486                 hdrlen = ieee80211_hdrlen(fc);
1487
1488                 if (rx->skb->len < 8 + hdrlen)
1489                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1490
1491                 /*
1492                  * no need to call ieee80211_wep_get_keyidx,
1493                  * it verifies a bunch of things we've done already
1494                  */
1495                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1496                 keyidx = keyid >> 6;
1497
1498                 /* check per-station GTK first, if multicast packet */
1499                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1500                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1501
1502                 /* if not found, try default key */
1503                 if (!rx->key) {
1504                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1505
1506                         /*
1507                          * RSNA-protected unicast frames should always be
1508                          * sent with pairwise or station-to-station keys,
1509                          * but for WEP we allow using a key index as well.
1510                          */
1511                         if (rx->key &&
1512                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1513                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1514                             !is_multicast_ether_addr(hdr->addr1))
1515                                 rx->key = NULL;
1516                 }
1517         }
1518
1519         if (rx->key) {
1520                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1521                         return RX_DROP_MONITOR;
1522
1523                 rx->key->tx_rx_count++;
1524                 /* TODO: add threshold stuff again */
1525         } else {
1526                 return RX_DROP_MONITOR;
1527         }
1528
1529         switch (rx->key->conf.cipher) {
1530         case WLAN_CIPHER_SUITE_WEP40:
1531         case WLAN_CIPHER_SUITE_WEP104:
1532                 result = ieee80211_crypto_wep_decrypt(rx);
1533                 break;
1534         case WLAN_CIPHER_SUITE_TKIP:
1535                 result = ieee80211_crypto_tkip_decrypt(rx);
1536                 break;
1537         case WLAN_CIPHER_SUITE_CCMP:
1538                 result = ieee80211_crypto_ccmp_decrypt(rx);
1539                 break;
1540         case WLAN_CIPHER_SUITE_AES_CMAC:
1541                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1542                 break;
1543         default:
1544                 /*
1545                  * We can reach here only with HW-only algorithms
1546                  * but why didn't it decrypt the frame?!
1547                  */
1548                 return RX_DROP_UNUSABLE;
1549         }
1550
1551         /* the hdr variable is invalid after the decrypt handlers */
1552
1553         /* either the frame has been decrypted or will be dropped */
1554         status->flag |= RX_FLAG_DECRYPTED;
1555
1556         return result;
1557 }
1558
1559 static inline struct ieee80211_fragment_entry *
1560 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1561                          unsigned int frag, unsigned int seq, int rx_queue,
1562                          struct sk_buff **skb)
1563 {
1564         struct ieee80211_fragment_entry *entry;
1565
1566         entry = &sdata->fragments[sdata->fragment_next++];
1567         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1568                 sdata->fragment_next = 0;
1569
1570         if (!skb_queue_empty(&entry->skb_list))
1571                 __skb_queue_purge(&entry->skb_list);
1572
1573         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1574         *skb = NULL;
1575         entry->first_frag_time = jiffies;
1576         entry->seq = seq;
1577         entry->rx_queue = rx_queue;
1578         entry->last_frag = frag;
1579         entry->ccmp = 0;
1580         entry->extra_len = 0;
1581
1582         return entry;
1583 }
1584
1585 static inline struct ieee80211_fragment_entry *
1586 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1587                           unsigned int frag, unsigned int seq,
1588                           int rx_queue, struct ieee80211_hdr *hdr)
1589 {
1590         struct ieee80211_fragment_entry *entry;
1591         int i, idx;
1592
1593         idx = sdata->fragment_next;
1594         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1595                 struct ieee80211_hdr *f_hdr;
1596
1597                 idx--;
1598                 if (idx < 0)
1599                         idx = IEEE80211_FRAGMENT_MAX - 1;
1600
1601                 entry = &sdata->fragments[idx];
1602                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1603                     entry->rx_queue != rx_queue ||
1604                     entry->last_frag + 1 != frag)
1605                         continue;
1606
1607                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1608
1609                 /*
1610                  * Check ftype and addresses are equal, else check next fragment
1611                  */
1612                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1613                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1614                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1615                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1616                         continue;
1617
1618                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1619                         __skb_queue_purge(&entry->skb_list);
1620                         continue;
1621                 }
1622                 return entry;
1623         }
1624
1625         return NULL;
1626 }
1627
1628 static ieee80211_rx_result debug_noinline
1629 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1630 {
1631         struct ieee80211_hdr *hdr;
1632         u16 sc;
1633         __le16 fc;
1634         unsigned int frag, seq;
1635         struct ieee80211_fragment_entry *entry;
1636         struct sk_buff *skb;
1637         struct ieee80211_rx_status *status;
1638
1639         hdr = (struct ieee80211_hdr *)rx->skb->data;
1640         fc = hdr->frame_control;
1641
1642         if (ieee80211_is_ctl(fc))
1643                 return RX_CONTINUE;
1644
1645         sc = le16_to_cpu(hdr->seq_ctrl);
1646         frag = sc & IEEE80211_SCTL_FRAG;
1647
1648         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1649                    is_multicast_ether_addr(hdr->addr1))) {
1650                 /* not fragmented */
1651                 goto out;
1652         }
1653         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1654
1655         if (skb_linearize(rx->skb))
1656                 return RX_DROP_UNUSABLE;
1657
1658         /*
1659          *  skb_linearize() might change the skb->data and
1660          *  previously cached variables (in this case, hdr) need to
1661          *  be refreshed with the new data.
1662          */
1663         hdr = (struct ieee80211_hdr *)rx->skb->data;
1664         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1665
1666         if (frag == 0) {
1667                 /* This is the first fragment of a new frame. */
1668                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1669                                                  rx->seqno_idx, &(rx->skb));
1670                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1671                     ieee80211_has_protected(fc)) {
1672                         int queue = rx->security_idx;
1673                         /* Store CCMP PN so that we can verify that the next
1674                          * fragment has a sequential PN value. */
1675                         entry->ccmp = 1;
1676                         memcpy(entry->last_pn,
1677                                rx->key->u.ccmp.rx_pn[queue],
1678                                IEEE80211_CCMP_PN_LEN);
1679                 }
1680                 return RX_QUEUED;
1681         }
1682
1683         /* This is a fragment for a frame that should already be pending in
1684          * fragment cache. Add this fragment to the end of the pending entry.
1685          */
1686         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1687                                           rx->seqno_idx, hdr);
1688         if (!entry) {
1689                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1690                 return RX_DROP_MONITOR;
1691         }
1692
1693         /* Verify that MPDUs within one MSDU have sequential PN values.
1694          * (IEEE 802.11i, 8.3.3.4.5) */
1695         if (entry->ccmp) {
1696                 int i;
1697                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1698                 int queue;
1699                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1700                         return RX_DROP_UNUSABLE;
1701                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1702                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1703                         pn[i]++;
1704                         if (pn[i])
1705                                 break;
1706                 }
1707                 queue = rx->security_idx;
1708                 rpn = rx->key->u.ccmp.rx_pn[queue];
1709                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1710                         return RX_DROP_UNUSABLE;
1711                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1712         }
1713
1714         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1715         __skb_queue_tail(&entry->skb_list, rx->skb);
1716         entry->last_frag = frag;
1717         entry->extra_len += rx->skb->len;
1718         if (ieee80211_has_morefrags(fc)) {
1719                 rx->skb = NULL;
1720                 return RX_QUEUED;
1721         }
1722
1723         rx->skb = __skb_dequeue(&entry->skb_list);
1724         if (skb_tailroom(rx->skb) < entry->extra_len) {
1725                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1726                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1727                                               GFP_ATOMIC))) {
1728                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1729                         __skb_queue_purge(&entry->skb_list);
1730                         return RX_DROP_UNUSABLE;
1731                 }
1732         }
1733         while ((skb = __skb_dequeue(&entry->skb_list))) {
1734                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1735                 dev_kfree_skb(skb);
1736         }
1737
1738         /* Complete frame has been reassembled - process it now */
1739         status = IEEE80211_SKB_RXCB(rx->skb);
1740         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1741
1742  out:
1743         if (rx->sta)
1744                 rx->sta->rx_packets++;
1745         if (is_multicast_ether_addr(hdr->addr1))
1746                 rx->local->dot11MulticastReceivedFrameCount++;
1747         else
1748                 ieee80211_led_rx(rx->local);
1749         return RX_CONTINUE;
1750 }
1751
1752 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1753 {
1754         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1755                 return -EACCES;
1756
1757         return 0;
1758 }
1759
1760 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1761 {
1762         struct sk_buff *skb = rx->skb;
1763         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1764
1765         /*
1766          * Pass through unencrypted frames if the hardware has
1767          * decrypted them already.
1768          */
1769         if (status->flag & RX_FLAG_DECRYPTED)
1770                 return 0;
1771
1772         /* Drop unencrypted frames if key is set. */
1773         if (unlikely(!ieee80211_has_protected(fc) &&
1774                      !ieee80211_is_nullfunc(fc) &&
1775                      ieee80211_is_data(fc) &&
1776                      (rx->key || rx->sdata->drop_unencrypted)))
1777                 return -EACCES;
1778
1779         return 0;
1780 }
1781
1782 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1783 {
1784         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1785         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1786         __le16 fc = hdr->frame_control;
1787
1788         /*
1789          * Pass through unencrypted frames if the hardware has
1790          * decrypted them already.
1791          */
1792         if (status->flag & RX_FLAG_DECRYPTED)
1793                 return 0;
1794
1795         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1796                 if (unlikely(!ieee80211_has_protected(fc) &&
1797                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1798                              rx->key)) {
1799                         if (ieee80211_is_deauth(fc) ||
1800                             ieee80211_is_disassoc(fc))
1801                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1802                                                              rx->skb->data,
1803                                                              rx->skb->len);
1804                         return -EACCES;
1805                 }
1806                 /* BIP does not use Protected field, so need to check MMIE */
1807                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1808                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1809                         if (ieee80211_is_deauth(fc) ||
1810                             ieee80211_is_disassoc(fc))
1811                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1812                                                              rx->skb->data,
1813                                                              rx->skb->len);
1814                         return -EACCES;
1815                 }
1816                 /*
1817                  * When using MFP, Action frames are not allowed prior to
1818                  * having configured keys.
1819                  */
1820                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1821                              ieee80211_is_robust_mgmt_frame(
1822                                      (struct ieee80211_hdr *) rx->skb->data)))
1823                         return -EACCES;
1824         }
1825
1826         return 0;
1827 }
1828
1829 static int
1830 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1831 {
1832         struct ieee80211_sub_if_data *sdata = rx->sdata;
1833         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1834         bool check_port_control = false;
1835         struct ethhdr *ehdr;
1836         int ret;
1837
1838         *port_control = false;
1839         if (ieee80211_has_a4(hdr->frame_control) &&
1840             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1841                 return -1;
1842
1843         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1844             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1845
1846                 if (!sdata->u.mgd.use_4addr)
1847                         return -1;
1848                 else
1849                         check_port_control = true;
1850         }
1851
1852         if (is_multicast_ether_addr(hdr->addr1) &&
1853             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1854                 return -1;
1855
1856         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1857         if (ret < 0)
1858                 return ret;
1859
1860         ehdr = (struct ethhdr *) rx->skb->data;
1861         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1862                 *port_control = true;
1863         else if (check_port_control)
1864                 return -1;
1865
1866         return 0;
1867 }
1868
1869 /*
1870  * requires that rx->skb is a frame with ethernet header
1871  */
1872 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1873 {
1874         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1875                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1876         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1877
1878         /*
1879          * Allow EAPOL frames to us/the PAE group address regardless
1880          * of whether the frame was encrypted or not.
1881          */
1882         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1883             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1884              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1885                 return true;
1886
1887         if (ieee80211_802_1x_port_control(rx) ||
1888             ieee80211_drop_unencrypted(rx, fc))
1889                 return false;
1890
1891         return true;
1892 }
1893
1894 /*
1895  * requires that rx->skb is a frame with ethernet header
1896  */
1897 static void
1898 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1899 {
1900         struct ieee80211_sub_if_data *sdata = rx->sdata;
1901         struct net_device *dev = sdata->dev;
1902         struct sk_buff *skb, *xmit_skb;
1903         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1904         struct sta_info *dsta;
1905         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1906
1907         skb = rx->skb;
1908         xmit_skb = NULL;
1909
1910         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1911              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1912             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1913             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1914             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1915                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1916                         /*
1917                          * send multicast frames both to higher layers in
1918                          * local net stack and back to the wireless medium
1919                          */
1920                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1921                         if (!xmit_skb)
1922                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1923                                                     dev->name);
1924                 } else {
1925                         dsta = sta_info_get(sdata, skb->data);
1926                         if (dsta) {
1927                                 /*
1928                                  * The destination station is associated to
1929                                  * this AP (in this VLAN), so send the frame
1930                                  * directly to it and do not pass it to local
1931                                  * net stack.
1932                                  */
1933                                 xmit_skb = skb;
1934                                 skb = NULL;
1935                         }
1936                 }
1937         }
1938
1939         if (skb) {
1940                 int align __maybe_unused;
1941
1942 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1943                 /*
1944                  * 'align' will only take the values 0 or 2 here
1945                  * since all frames are required to be aligned
1946                  * to 2-byte boundaries when being passed to
1947                  * mac80211; the code here works just as well if
1948                  * that isn't true, but mac80211 assumes it can
1949                  * access fields as 2-byte aligned (e.g. for
1950                  * compare_ether_addr)
1951                  */
1952                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1953                 if (align) {
1954                         if (WARN_ON(skb_headroom(skb) < 3)) {
1955                                 dev_kfree_skb(skb);
1956                                 skb = NULL;
1957                         } else {
1958                                 u8 *data = skb->data;
1959                                 size_t len = skb_headlen(skb);
1960                                 skb->data -= align;
1961                                 memmove(skb->data, data, len);
1962                                 skb_set_tail_pointer(skb, len);
1963                         }
1964                 }
1965 #endif
1966
1967                 if (skb) {
1968                         /* deliver to local stack */
1969                         skb->protocol = eth_type_trans(skb, dev);
1970                         memset(skb->cb, 0, sizeof(skb->cb));
1971                         netif_receive_skb(skb);
1972                 }
1973         }
1974
1975         if (xmit_skb) {
1976                 /*
1977                  * Send to wireless media and increase priority by 256 to
1978                  * keep the received priority instead of reclassifying
1979                  * the frame (see cfg80211_classify8021d).
1980                  */
1981                 xmit_skb->priority += 256;
1982                 xmit_skb->protocol = htons(ETH_P_802_3);
1983                 skb_reset_network_header(xmit_skb);
1984                 skb_reset_mac_header(xmit_skb);
1985                 dev_queue_xmit(xmit_skb);
1986         }
1987 }
1988
1989 static ieee80211_rx_result debug_noinline
1990 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1991 {
1992         struct net_device *dev = rx->sdata->dev;
1993         struct sk_buff *skb = rx->skb;
1994         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1995         __le16 fc = hdr->frame_control;
1996         struct sk_buff_head frame_list;
1997         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1998
1999         if (unlikely(!ieee80211_is_data(fc)))
2000                 return RX_CONTINUE;
2001
2002         if (unlikely(!ieee80211_is_data_present(fc)))
2003                 return RX_DROP_MONITOR;
2004
2005         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2006                 return RX_CONTINUE;
2007
2008         if (ieee80211_has_a4(hdr->frame_control) &&
2009             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2010             !rx->sdata->u.vlan.sta)
2011                 return RX_DROP_UNUSABLE;
2012
2013         if (is_multicast_ether_addr(hdr->addr1) &&
2014             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2015               rx->sdata->u.vlan.sta) ||
2016              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2017               rx->sdata->u.mgd.use_4addr)))
2018                 return RX_DROP_UNUSABLE;
2019
2020         skb->dev = dev;
2021         __skb_queue_head_init(&frame_list);
2022
2023         if (skb_linearize(skb))
2024                 return RX_DROP_UNUSABLE;
2025
2026         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2027                                  rx->sdata->vif.type,
2028                                  rx->local->hw.extra_tx_headroom, true);
2029
2030         while (!skb_queue_empty(&frame_list)) {
2031                 rx->skb = __skb_dequeue(&frame_list);
2032
2033                 if (!ieee80211_frame_allowed(rx, fc)) {
2034                         dev_kfree_skb(rx->skb);
2035                         continue;
2036                 }
2037                 dev->stats.rx_packets++;
2038                 dev->stats.rx_bytes += rx->skb->len;
2039
2040                 ieee80211_deliver_skb(rx);
2041         }
2042
2043         return RX_QUEUED;
2044 }
2045
2046 #ifdef CONFIG_MAC80211_MESH
2047 static ieee80211_rx_result
2048 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2049 {
2050         struct ieee80211_hdr *fwd_hdr, *hdr;
2051         struct ieee80211_tx_info *info;
2052         struct ieee80211s_hdr *mesh_hdr;
2053         struct sk_buff *skb = rx->skb, *fwd_skb;
2054         struct ieee80211_local *local = rx->local;
2055         struct ieee80211_sub_if_data *sdata = rx->sdata;
2056         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2057         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2058         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2059         u16 q, hdrlen;
2060
2061         hdr = (struct ieee80211_hdr *) skb->data;
2062         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2063
2064         /* make sure fixed part of mesh header is there, also checks skb len */
2065         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2066                 return RX_DROP_MONITOR;
2067
2068         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2069
2070         /* make sure full mesh header is there, also checks skb len */
2071         if (!pskb_may_pull(rx->skb,
2072                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2073                 return RX_DROP_MONITOR;
2074
2075         /* reload pointers */
2076         hdr = (struct ieee80211_hdr *) skb->data;
2077         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2078
2079         /* frame is in RMC, don't forward */
2080         if (ieee80211_is_data(hdr->frame_control) &&
2081             is_multicast_ether_addr(hdr->addr1) &&
2082             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2083                 return RX_DROP_MONITOR;
2084
2085         if (!ieee80211_is_data(hdr->frame_control) ||
2086             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2087                 return RX_CONTINUE;
2088
2089         if (!mesh_hdr->ttl)
2090                 return RX_DROP_MONITOR;
2091
2092         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2093                 struct mesh_path *mppath;
2094                 char *proxied_addr;
2095                 char *mpp_addr;
2096
2097                 if (is_multicast_ether_addr(hdr->addr1)) {
2098                         mpp_addr = hdr->addr3;
2099                         proxied_addr = mesh_hdr->eaddr1;
2100                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2101                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2102                         mpp_addr = hdr->addr4;
2103                         proxied_addr = mesh_hdr->eaddr2;
2104                 } else {
2105                         return RX_DROP_MONITOR;
2106                 }
2107
2108                 rcu_read_lock();
2109                 mppath = mpp_path_lookup(sdata, proxied_addr);
2110                 if (!mppath) {
2111                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2112                 } else {
2113                         spin_lock_bh(&mppath->state_lock);
2114                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2115                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2116                         spin_unlock_bh(&mppath->state_lock);
2117                 }
2118                 rcu_read_unlock();
2119         }
2120
2121         /* Frame has reached destination.  Don't forward */
2122         if (!is_multicast_ether_addr(hdr->addr1) &&
2123             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2124                 return RX_CONTINUE;
2125
2126         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2127         if (ieee80211_queue_stopped(&local->hw, q)) {
2128                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2129                 return RX_DROP_MONITOR;
2130         }
2131         skb_set_queue_mapping(skb, q);
2132
2133         if (!--mesh_hdr->ttl) {
2134                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2135                 goto out;
2136         }
2137
2138         if (!ifmsh->mshcfg.dot11MeshForwarding)
2139                 goto out;
2140
2141         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2142         if (!fwd_skb) {
2143                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2144                                     sdata->name);
2145                 goto out;
2146         }
2147
2148         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2149         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2150         info = IEEE80211_SKB_CB(fwd_skb);
2151         memset(info, 0, sizeof(*info));
2152         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2153         info->control.vif = &rx->sdata->vif;
2154         info->control.jiffies = jiffies;
2155         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2156                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2157                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2158                 /* update power mode indication when forwarding */
2159                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2160         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2161                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2162                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2163         } else {
2164                 /* unable to resolve next hop */
2165                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2166                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2167                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2168                 kfree_skb(fwd_skb);
2169                 return RX_DROP_MONITOR;
2170         }
2171
2172         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2173         ieee80211_add_pending_skb(local, fwd_skb);
2174  out:
2175         if (is_multicast_ether_addr(hdr->addr1) ||
2176             sdata->dev->flags & IFF_PROMISC)
2177                 return RX_CONTINUE;
2178         else
2179                 return RX_DROP_MONITOR;
2180 }
2181 #endif
2182
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2185 {
2186         struct ieee80211_sub_if_data *sdata = rx->sdata;
2187         struct ieee80211_local *local = rx->local;
2188         struct net_device *dev = sdata->dev;
2189         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2190         __le16 fc = hdr->frame_control;
2191         bool port_control;
2192         int err;
2193
2194         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2195                 return RX_CONTINUE;
2196
2197         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2198                 return RX_DROP_MONITOR;
2199
2200         /*
2201          * Send unexpected-4addr-frame event to hostapd. For older versions,
2202          * also drop the frame to cooked monitor interfaces.
2203          */
2204         if (ieee80211_has_a4(hdr->frame_control) &&
2205             sdata->vif.type == NL80211_IFTYPE_AP) {
2206                 if (rx->sta &&
2207                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2208                         cfg80211_rx_unexpected_4addr_frame(
2209                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2210                 return RX_DROP_MONITOR;
2211         }
2212
2213         err = __ieee80211_data_to_8023(rx, &port_control);
2214         if (unlikely(err))
2215                 return RX_DROP_UNUSABLE;
2216
2217         if (!ieee80211_frame_allowed(rx, fc))
2218                 return RX_DROP_MONITOR;
2219
2220         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2221             unlikely(port_control) && sdata->bss) {
2222                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2223                                      u.ap);
2224                 dev = sdata->dev;
2225                 rx->sdata = sdata;
2226         }
2227
2228         rx->skb->dev = dev;
2229
2230         dev->stats.rx_packets++;
2231         dev->stats.rx_bytes += rx->skb->len;
2232
2233         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2234             !is_multicast_ether_addr(
2235                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2236             (!local->scanning &&
2237              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2238                         mod_timer(&local->dynamic_ps_timer, jiffies +
2239                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2240         }
2241
2242         ieee80211_deliver_skb(rx);
2243
2244         return RX_QUEUED;
2245 }
2246
2247 static ieee80211_rx_result debug_noinline
2248 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2249 {
2250         struct sk_buff *skb = rx->skb;
2251         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2252         struct tid_ampdu_rx *tid_agg_rx;
2253         u16 start_seq_num;
2254         u16 tid;
2255
2256         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2257                 return RX_CONTINUE;
2258
2259         if (ieee80211_is_back_req(bar->frame_control)) {
2260                 struct {
2261                         __le16 control, start_seq_num;
2262                 } __packed bar_data;
2263
2264                 if (!rx->sta)
2265                         return RX_DROP_MONITOR;
2266
2267                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2268                                   &bar_data, sizeof(bar_data)))
2269                         return RX_DROP_MONITOR;
2270
2271                 tid = le16_to_cpu(bar_data.control) >> 12;
2272
2273                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2274                 if (!tid_agg_rx)
2275                         return RX_DROP_MONITOR;
2276
2277                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2278
2279                 /* reset session timer */
2280                 if (tid_agg_rx->timeout)
2281                         mod_timer(&tid_agg_rx->session_timer,
2282                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2283
2284                 spin_lock(&tid_agg_rx->reorder_lock);
2285                 /* release stored frames up to start of BAR */
2286                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2287                                                  start_seq_num, frames);
2288                 spin_unlock(&tid_agg_rx->reorder_lock);
2289
2290                 kfree_skb(skb);
2291                 return RX_QUEUED;
2292         }
2293
2294         /*
2295          * After this point, we only want management frames,
2296          * so we can drop all remaining control frames to
2297          * cooked monitor interfaces.
2298          */
2299         return RX_DROP_MONITOR;
2300 }
2301
2302 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2303                                            struct ieee80211_mgmt *mgmt,
2304                                            size_t len)
2305 {
2306         struct ieee80211_local *local = sdata->local;
2307         struct sk_buff *skb;
2308         struct ieee80211_mgmt *resp;
2309
2310         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2311                 /* Not to own unicast address */
2312                 return;
2313         }
2314
2315         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2316             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2317                 /* Not from the current AP or not associated yet. */
2318                 return;
2319         }
2320
2321         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2322                 /* Too short SA Query request frame */
2323                 return;
2324         }
2325
2326         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2327         if (skb == NULL)
2328                 return;
2329
2330         skb_reserve(skb, local->hw.extra_tx_headroom);
2331         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2332         memset(resp, 0, 24);
2333         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2334         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2335         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2336         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2337                                           IEEE80211_STYPE_ACTION);
2338         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2339         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2340         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2341         memcpy(resp->u.action.u.sa_query.trans_id,
2342                mgmt->u.action.u.sa_query.trans_id,
2343                WLAN_SA_QUERY_TR_ID_LEN);
2344
2345         ieee80211_tx_skb(sdata, skb);
2346 }
2347
2348 static ieee80211_rx_result debug_noinline
2349 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2350 {
2351         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2352         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2353
2354         /*
2355          * From here on, look only at management frames.
2356          * Data and control frames are already handled,
2357          * and unknown (reserved) frames are useless.
2358          */
2359         if (rx->skb->len < 24)
2360                 return RX_DROP_MONITOR;
2361
2362         if (!ieee80211_is_mgmt(mgmt->frame_control))
2363                 return RX_DROP_MONITOR;
2364
2365         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2366             ieee80211_is_beacon(mgmt->frame_control) &&
2367             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2368                 int sig = 0;
2369
2370                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2371                         sig = status->signal;
2372
2373                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2374                                             rx->skb->data, rx->skb->len,
2375                                             status->freq, sig);
2376                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2377         }
2378
2379         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2380                 return RX_DROP_MONITOR;
2381
2382         if (ieee80211_drop_unencrypted_mgmt(rx))
2383                 return RX_DROP_UNUSABLE;
2384
2385         return RX_CONTINUE;
2386 }
2387
2388 static ieee80211_rx_result debug_noinline
2389 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2390 {
2391         struct ieee80211_local *local = rx->local;
2392         struct ieee80211_sub_if_data *sdata = rx->sdata;
2393         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2394         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2395         int len = rx->skb->len;
2396
2397         if (!ieee80211_is_action(mgmt->frame_control))
2398                 return RX_CONTINUE;
2399
2400         /* drop too small frames */
2401         if (len < IEEE80211_MIN_ACTION_SIZE)
2402                 return RX_DROP_UNUSABLE;
2403
2404         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2405             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2406                 return RX_DROP_UNUSABLE;
2407
2408         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2409                 return RX_DROP_UNUSABLE;
2410
2411         switch (mgmt->u.action.category) {
2412         case WLAN_CATEGORY_HT:
2413                 /* reject HT action frames from stations not supporting HT */
2414                 if (!rx->sta->sta.ht_cap.ht_supported)
2415                         goto invalid;
2416
2417                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2418                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2419                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2420                     sdata->vif.type != NL80211_IFTYPE_AP &&
2421                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2422                         break;
2423
2424                 /* verify action & smps_control/chanwidth are present */
2425                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2426                         goto invalid;
2427
2428                 switch (mgmt->u.action.u.ht_smps.action) {
2429                 case WLAN_HT_ACTION_SMPS: {
2430                         struct ieee80211_supported_band *sband;
2431                         enum ieee80211_smps_mode smps_mode;
2432
2433                         /* convert to HT capability */
2434                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2435                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2436                                 smps_mode = IEEE80211_SMPS_OFF;
2437                                 break;
2438                         case WLAN_HT_SMPS_CONTROL_STATIC:
2439                                 smps_mode = IEEE80211_SMPS_STATIC;
2440                                 break;
2441                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2442                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2443                                 break;
2444                         default:
2445                                 goto invalid;
2446                         }
2447
2448                         /* if no change do nothing */
2449                         if (rx->sta->sta.smps_mode == smps_mode)
2450                                 goto handled;
2451                         rx->sta->sta.smps_mode = smps_mode;
2452
2453                         sband = rx->local->hw.wiphy->bands[status->band];
2454
2455                         rate_control_rate_update(local, sband, rx->sta,
2456                                                  IEEE80211_RC_SMPS_CHANGED);
2457                         goto handled;
2458                 }
2459                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2460                         struct ieee80211_supported_band *sband;
2461                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2462                         enum ieee80211_sta_rx_bandwidth new_bw;
2463
2464                         /* If it doesn't support 40 MHz it can't change ... */
2465                         if (!(rx->sta->sta.ht_cap.cap &
2466                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2467                                 goto handled;
2468
2469                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2470                                 new_bw = IEEE80211_STA_RX_BW_20;
2471                         else
2472                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2473
2474                         if (rx->sta->sta.bandwidth == new_bw)
2475                                 goto handled;
2476
2477                         sband = rx->local->hw.wiphy->bands[status->band];
2478
2479                         rate_control_rate_update(local, sband, rx->sta,
2480                                                  IEEE80211_RC_BW_CHANGED);
2481                         goto handled;
2482                 }
2483                 default:
2484                         goto invalid;
2485                 }
2486
2487                 break;
2488         case WLAN_CATEGORY_PUBLIC:
2489                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2490                         goto invalid;
2491                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2492                         break;
2493                 if (!rx->sta)
2494                         break;
2495                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2496                         break;
2497                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2498                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2499                         break;
2500                 if (len < offsetof(struct ieee80211_mgmt,
2501                                    u.action.u.ext_chan_switch.variable))
2502                         goto invalid;
2503                 goto queue;
2504         case WLAN_CATEGORY_VHT:
2505                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2506                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2507                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2508                     sdata->vif.type != NL80211_IFTYPE_AP &&
2509                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2510                         break;
2511
2512                 /* verify action code is present */
2513                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2514                         goto invalid;
2515
2516                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2517                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2518                         u8 opmode;
2519
2520                         /* verify opmode is present */
2521                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2522                                 goto invalid;
2523
2524                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2525
2526                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2527                                                     opmode, status->band,
2528                                                     false);
2529                         goto handled;
2530                 }
2531                 default:
2532                         break;
2533                 }
2534                 break;
2535         case WLAN_CATEGORY_BACK:
2536                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2537                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2538                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2539                     sdata->vif.type != NL80211_IFTYPE_AP &&
2540                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2541                         break;
2542
2543                 /* verify action_code is present */
2544                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2545                         break;
2546
2547                 switch (mgmt->u.action.u.addba_req.action_code) {
2548                 case WLAN_ACTION_ADDBA_REQ:
2549                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2550                                    sizeof(mgmt->u.action.u.addba_req)))
2551                                 goto invalid;
2552                         break;
2553                 case WLAN_ACTION_ADDBA_RESP:
2554                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2555                                    sizeof(mgmt->u.action.u.addba_resp)))
2556                                 goto invalid;
2557                         break;
2558                 case WLAN_ACTION_DELBA:
2559                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2560                                    sizeof(mgmt->u.action.u.delba)))
2561                                 goto invalid;
2562                         break;
2563                 default:
2564                         goto invalid;
2565                 }
2566
2567                 goto queue;
2568         case WLAN_CATEGORY_SPECTRUM_MGMT:
2569                 if (status->band != IEEE80211_BAND_5GHZ)
2570                         break;
2571
2572                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2573                         break;
2574
2575                 /* verify action_code is present */
2576                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2577                         break;
2578
2579                 switch (mgmt->u.action.u.measurement.action_code) {
2580                 case WLAN_ACTION_SPCT_MSR_REQ:
2581                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2582                                    sizeof(mgmt->u.action.u.measurement)))
2583                                 break;
2584                         ieee80211_process_measurement_req(sdata, mgmt, len);
2585                         goto handled;
2586                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2587                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2588                                 break;
2589
2590                         if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2591                                 break;
2592
2593                         goto queue;
2594                 }
2595                 break;
2596         case WLAN_CATEGORY_SA_QUERY:
2597                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2598                            sizeof(mgmt->u.action.u.sa_query)))
2599                         break;
2600
2601                 switch (mgmt->u.action.u.sa_query.action) {
2602                 case WLAN_ACTION_SA_QUERY_REQUEST:
2603                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2604                                 break;
2605                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2606                         goto handled;
2607                 }
2608                 break;
2609         case WLAN_CATEGORY_SELF_PROTECTED:
2610                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2611                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2612                         break;
2613
2614                 switch (mgmt->u.action.u.self_prot.action_code) {
2615                 case WLAN_SP_MESH_PEERING_OPEN:
2616                 case WLAN_SP_MESH_PEERING_CLOSE:
2617                 case WLAN_SP_MESH_PEERING_CONFIRM:
2618                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2619                                 goto invalid;
2620                         if (sdata->u.mesh.user_mpm)
2621                                 /* userspace handles this frame */
2622                                 break;
2623                         goto queue;
2624                 case WLAN_SP_MGK_INFORM:
2625                 case WLAN_SP_MGK_ACK:
2626                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2627                                 goto invalid;
2628                         break;
2629                 }
2630                 break;
2631         case WLAN_CATEGORY_MESH_ACTION:
2632                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2633                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2634                         break;
2635
2636                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2637                         break;
2638                 if (mesh_action_is_path_sel(mgmt) &&
2639                     !mesh_path_sel_is_hwmp(sdata))
2640                         break;
2641                 goto queue;
2642         }
2643
2644         return RX_CONTINUE;
2645
2646  invalid:
2647         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2648         /* will return in the next handlers */
2649         return RX_CONTINUE;
2650
2651  handled:
2652         if (rx->sta)
2653                 rx->sta->rx_packets++;
2654         dev_kfree_skb(rx->skb);
2655         return RX_QUEUED;
2656
2657  queue:
2658         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2659         skb_queue_tail(&sdata->skb_queue, rx->skb);
2660         ieee80211_queue_work(&local->hw, &sdata->work);
2661         if (rx->sta)
2662                 rx->sta->rx_packets++;
2663         return RX_QUEUED;
2664 }
2665
2666 static ieee80211_rx_result debug_noinline
2667 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2668 {
2669         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2670         int sig = 0;
2671
2672         /* skip known-bad action frames and return them in the next handler */
2673         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2674                 return RX_CONTINUE;
2675
2676         /*
2677          * Getting here means the kernel doesn't know how to handle
2678          * it, but maybe userspace does ... include returned frames
2679          * so userspace can register for those to know whether ones
2680          * it transmitted were processed or returned.
2681          */
2682
2683         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2684                 sig = status->signal;
2685
2686         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2687                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2688                 if (rx->sta)
2689                         rx->sta->rx_packets++;
2690                 dev_kfree_skb(rx->skb);
2691                 return RX_QUEUED;
2692         }
2693
2694         return RX_CONTINUE;
2695 }
2696
2697 static ieee80211_rx_result debug_noinline
2698 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2699 {
2700         struct ieee80211_local *local = rx->local;
2701         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2702         struct sk_buff *nskb;
2703         struct ieee80211_sub_if_data *sdata = rx->sdata;
2704         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2705
2706         if (!ieee80211_is_action(mgmt->frame_control))
2707                 return RX_CONTINUE;
2708
2709         /*
2710          * For AP mode, hostapd is responsible for handling any action
2711          * frames that we didn't handle, including returning unknown
2712          * ones. For all other modes we will return them to the sender,
2713          * setting the 0x80 bit in the action category, as required by
2714          * 802.11-2012 9.24.4.
2715          * Newer versions of hostapd shall also use the management frame
2716          * registration mechanisms, but older ones still use cooked
2717          * monitor interfaces so push all frames there.
2718          */
2719         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2720             (sdata->vif.type == NL80211_IFTYPE_AP ||
2721              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2722                 return RX_DROP_MONITOR;
2723
2724         if (is_multicast_ether_addr(mgmt->da))
2725                 return RX_DROP_MONITOR;
2726
2727         /* do not return rejected action frames */
2728         if (mgmt->u.action.category & 0x80)
2729                 return RX_DROP_UNUSABLE;
2730
2731         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2732                                GFP_ATOMIC);
2733         if (nskb) {
2734                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2735
2736                 nmgmt->u.action.category |= 0x80;
2737                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2738                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2739
2740                 memset(nskb->cb, 0, sizeof(nskb->cb));
2741
2742                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2743                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2744
2745                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2746                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2747                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2748                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2749                                 info->hw_queue =
2750                                         local->hw.offchannel_tx_hw_queue;
2751                 }
2752
2753                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2754                                             status->band);
2755         }
2756         dev_kfree_skb(rx->skb);
2757         return RX_QUEUED;
2758 }
2759
2760 static ieee80211_rx_result debug_noinline
2761 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2762 {
2763         struct ieee80211_sub_if_data *sdata = rx->sdata;
2764         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2765         __le16 stype;
2766
2767         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2768
2769         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2770             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2771             sdata->vif.type != NL80211_IFTYPE_STATION)
2772                 return RX_DROP_MONITOR;
2773
2774         switch (stype) {
2775         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2776         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2777         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2778                 /* process for all: mesh, mlme, ibss */
2779                 break;
2780         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2781         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2782         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2783         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2784                 if (is_multicast_ether_addr(mgmt->da) &&
2785                     !is_broadcast_ether_addr(mgmt->da))
2786                         return RX_DROP_MONITOR;
2787
2788                 /* process only for station */
2789                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2790                         return RX_DROP_MONITOR;
2791                 break;
2792         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2793                 /* process only for ibss and mesh */
2794                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2795                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2796                         return RX_DROP_MONITOR;
2797                 break;
2798         default:
2799                 return RX_DROP_MONITOR;
2800         }
2801
2802         /* queue up frame and kick off work to process it */
2803         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2804         skb_queue_tail(&sdata->skb_queue, rx->skb);
2805         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2806         if (rx->sta)
2807                 rx->sta->rx_packets++;
2808
2809         return RX_QUEUED;
2810 }
2811
2812 /* TODO: use IEEE80211_RX_FRAGMENTED */
2813 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2814                                         struct ieee80211_rate *rate)
2815 {
2816         struct ieee80211_sub_if_data *sdata;
2817         struct ieee80211_local *local = rx->local;
2818         struct sk_buff *skb = rx->skb, *skb2;
2819         struct net_device *prev_dev = NULL;
2820         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2821         int needed_headroom;
2822
2823         /*
2824          * If cooked monitor has been processed already, then
2825          * don't do it again. If not, set the flag.
2826          */
2827         if (rx->flags & IEEE80211_RX_CMNTR)
2828                 goto out_free_skb;
2829         rx->flags |= IEEE80211_RX_CMNTR;
2830
2831         /* If there are no cooked monitor interfaces, just free the SKB */
2832         if (!local->cooked_mntrs)
2833                 goto out_free_skb;
2834
2835         /* room for the radiotap header based on driver features */
2836         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2837
2838         if (skb_headroom(skb) < needed_headroom &&
2839             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2840                 goto out_free_skb;
2841
2842         /* prepend radiotap information */
2843         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2844                                          false);
2845
2846         skb_set_mac_header(skb, 0);
2847         skb->ip_summed = CHECKSUM_UNNECESSARY;
2848         skb->pkt_type = PACKET_OTHERHOST;
2849         skb->protocol = htons(ETH_P_802_2);
2850
2851         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2852                 if (!ieee80211_sdata_running(sdata))
2853                         continue;
2854
2855                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2856                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2857                         continue;
2858
2859                 if (prev_dev) {
2860                         skb2 = skb_clone(skb, GFP_ATOMIC);
2861                         if (skb2) {
2862                                 skb2->dev = prev_dev;
2863                                 netif_receive_skb(skb2);
2864                         }
2865                 }
2866
2867                 prev_dev = sdata->dev;
2868                 sdata->dev->stats.rx_packets++;
2869                 sdata->dev->stats.rx_bytes += skb->len;
2870         }
2871
2872         if (prev_dev) {
2873                 skb->dev = prev_dev;
2874                 netif_receive_skb(skb);
2875                 return;
2876         }
2877
2878  out_free_skb:
2879         dev_kfree_skb(skb);
2880 }
2881
2882 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2883                                          ieee80211_rx_result res)
2884 {
2885         switch (res) {
2886         case RX_DROP_MONITOR:
2887                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2888                 if (rx->sta)
2889                         rx->sta->rx_dropped++;
2890                 /* fall through */
2891         case RX_CONTINUE: {
2892                 struct ieee80211_rate *rate = NULL;
2893                 struct ieee80211_supported_band *sband;
2894                 struct ieee80211_rx_status *status;
2895
2896                 status = IEEE80211_SKB_RXCB((rx->skb));
2897
2898                 sband = rx->local->hw.wiphy->bands[status->band];
2899                 if (!(status->flag & RX_FLAG_HT) &&
2900                     !(status->flag & RX_FLAG_VHT))
2901                         rate = &sband->bitrates[status->rate_idx];
2902
2903                 ieee80211_rx_cooked_monitor(rx, rate);
2904                 break;
2905                 }
2906         case RX_DROP_UNUSABLE:
2907                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2908                 if (rx->sta)
2909                         rx->sta->rx_dropped++;
2910                 dev_kfree_skb(rx->skb);
2911                 break;
2912         case RX_QUEUED:
2913                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2914                 break;
2915         }
2916 }
2917
2918 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2919                                   struct sk_buff_head *frames)
2920 {
2921         ieee80211_rx_result res = RX_DROP_MONITOR;
2922         struct sk_buff *skb;
2923
2924 #define CALL_RXH(rxh)                   \
2925         do {                            \
2926                 res = rxh(rx);          \
2927                 if (res != RX_CONTINUE) \
2928                         goto rxh_next;  \
2929         } while (0);
2930
2931         spin_lock_bh(&rx->local->rx_path_lock);
2932
2933         while ((skb = __skb_dequeue(frames))) {
2934                 /*
2935                  * all the other fields are valid across frames
2936                  * that belong to an aMPDU since they are on the
2937                  * same TID from the same station
2938                  */
2939                 rx->skb = skb;
2940
2941                 CALL_RXH(ieee80211_rx_h_check_more_data)
2942                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2943                 CALL_RXH(ieee80211_rx_h_sta_process)
2944                 CALL_RXH(ieee80211_rx_h_decrypt)
2945                 CALL_RXH(ieee80211_rx_h_defragment)
2946                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2947                 /* must be after MMIC verify so header is counted in MPDU mic */
2948 #ifdef CONFIG_MAC80211_MESH
2949                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2950                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2951 #endif
2952                 CALL_RXH(ieee80211_rx_h_amsdu)
2953                 CALL_RXH(ieee80211_rx_h_data)
2954
2955                 /* special treatment -- needs the queue */
2956                 res = ieee80211_rx_h_ctrl(rx, frames);
2957                 if (res != RX_CONTINUE)
2958                         goto rxh_next;
2959
2960                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2961                 CALL_RXH(ieee80211_rx_h_action)
2962                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2963                 CALL_RXH(ieee80211_rx_h_action_return)
2964                 CALL_RXH(ieee80211_rx_h_mgmt)
2965
2966  rxh_next:
2967                 ieee80211_rx_handlers_result(rx, res);
2968
2969 #undef CALL_RXH
2970         }
2971
2972         spin_unlock_bh(&rx->local->rx_path_lock);
2973 }
2974
2975 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2976 {
2977         struct sk_buff_head reorder_release;
2978         ieee80211_rx_result res = RX_DROP_MONITOR;
2979
2980         __skb_queue_head_init(&reorder_release);
2981
2982 #define CALL_RXH(rxh)                   \
2983         do {                            \
2984                 res = rxh(rx);          \
2985                 if (res != RX_CONTINUE) \
2986                         goto rxh_next;  \
2987         } while (0);
2988
2989         CALL_RXH(ieee80211_rx_h_check)
2990
2991         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2992
2993         ieee80211_rx_handlers(rx, &reorder_release);
2994         return;
2995
2996  rxh_next:
2997         ieee80211_rx_handlers_result(rx, res);
2998
2999 #undef CALL_RXH
3000 }
3001
3002 /*
3003  * This function makes calls into the RX path, therefore
3004  * it has to be invoked under RCU read lock.
3005  */
3006 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3007 {
3008         struct sk_buff_head frames;
3009         struct ieee80211_rx_data rx = {
3010                 .sta = sta,
3011                 .sdata = sta->sdata,
3012                 .local = sta->local,
3013                 /* This is OK -- must be QoS data frame */
3014                 .security_idx = tid,
3015                 .seqno_idx = tid,
3016                 .flags = 0,
3017         };
3018         struct tid_ampdu_rx *tid_agg_rx;
3019
3020         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3021         if (!tid_agg_rx)
3022                 return;
3023
3024         __skb_queue_head_init(&frames);
3025
3026         spin_lock(&tid_agg_rx->reorder_lock);
3027         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3028         spin_unlock(&tid_agg_rx->reorder_lock);
3029
3030         ieee80211_rx_handlers(&rx, &frames);
3031 }
3032
3033 /* main receive path */
3034
3035 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3036                                 struct ieee80211_hdr *hdr)
3037 {
3038         struct ieee80211_sub_if_data *sdata = rx->sdata;
3039         struct sk_buff *skb = rx->skb;
3040         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3041         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3042         int multicast = is_multicast_ether_addr(hdr->addr1);
3043
3044         switch (sdata->vif.type) {
3045         case NL80211_IFTYPE_STATION:
3046                 if (!bssid && !sdata->u.mgd.use_4addr)
3047                         return 0;
3048                 if (!multicast &&
3049                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3050                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3051                             sdata->u.mgd.use_4addr)
3052                                 return 0;
3053                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3054                 }
3055                 break;
3056         case NL80211_IFTYPE_ADHOC:
3057                 if (!bssid)
3058                         return 0;
3059                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3060                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3061                         return 0;
3062                 if (ieee80211_is_beacon(hdr->frame_control)) {
3063                         return 1;
3064                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3065                         return 0;
3066                 } else if (!multicast &&
3067                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3068                         if (!(sdata->dev->flags & IFF_PROMISC))
3069                                 return 0;
3070                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3071                 } else if (!rx->sta) {
3072                         int rate_idx;
3073                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3074                                 rate_idx = 0; /* TODO: HT/VHT rates */
3075                         else
3076                                 rate_idx = status->rate_idx;
3077                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3078                                                  BIT(rate_idx));
3079                 }
3080                 break;
3081         case NL80211_IFTYPE_MESH_POINT:
3082                 if (!multicast &&
3083                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3084                         if (!(sdata->dev->flags & IFF_PROMISC))
3085                                 return 0;
3086
3087                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3088                 }
3089                 break;
3090         case NL80211_IFTYPE_AP_VLAN:
3091         case NL80211_IFTYPE_AP:
3092                 if (!bssid) {
3093                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3094                                 return 0;
3095                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3096                         /*
3097                          * Accept public action frames even when the
3098                          * BSSID doesn't match, this is used for P2P
3099                          * and location updates. Note that mac80211
3100                          * itself never looks at these frames.
3101                          */
3102                         if (!multicast &&
3103                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3104                                 return 0;
3105                         if (ieee80211_is_public_action(hdr, skb->len))
3106                                 return 1;
3107                         if (!ieee80211_is_beacon(hdr->frame_control))
3108                                 return 0;
3109                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3110                 }
3111                 break;
3112         case NL80211_IFTYPE_WDS:
3113                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3114                         return 0;
3115                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3116                         return 0;
3117                 break;
3118         case NL80211_IFTYPE_P2P_DEVICE:
3119                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3120                     !ieee80211_is_probe_req(hdr->frame_control) &&
3121                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3122                     !ieee80211_is_beacon(hdr->frame_control))
3123                         return 0;
3124                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3125                     !multicast)
3126                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3127                 break;
3128         default:
3129                 /* should never get here */
3130                 WARN_ON_ONCE(1);
3131                 break;
3132         }
3133
3134         return 1;
3135 }
3136
3137 /*
3138  * This function returns whether or not the SKB
3139  * was destined for RX processing or not, which,
3140  * if consume is true, is equivalent to whether
3141  * or not the skb was consumed.
3142  */
3143 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3144                                             struct sk_buff *skb, bool consume)
3145 {
3146         struct ieee80211_local *local = rx->local;
3147         struct ieee80211_sub_if_data *sdata = rx->sdata;
3148         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3149         struct ieee80211_hdr *hdr = (void *)skb->data;
3150         int prepares;
3151
3152         rx->skb = skb;
3153         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3154         prepares = prepare_for_handlers(rx, hdr);
3155
3156         if (!prepares)
3157                 return false;
3158
3159         if (!consume) {
3160                 skb = skb_copy(skb, GFP_ATOMIC);
3161                 if (!skb) {
3162                         if (net_ratelimit())
3163                                 wiphy_debug(local->hw.wiphy,
3164                                         "failed to copy skb for %s\n",
3165                                         sdata->name);
3166                         return true;
3167                 }
3168
3169                 rx->skb = skb;
3170         }
3171
3172         ieee80211_invoke_rx_handlers(rx);
3173         return true;
3174 }
3175
3176 /*
3177  * This is the actual Rx frames handler. as it blongs to Rx path it must
3178  * be called with rcu_read_lock protection.
3179  */
3180 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3181                                          struct sk_buff *skb)
3182 {
3183         struct ieee80211_local *local = hw_to_local(hw);
3184         struct ieee80211_sub_if_data *sdata;
3185         struct ieee80211_hdr *hdr;
3186         __le16 fc;
3187         struct ieee80211_rx_data rx;
3188         struct ieee80211_sub_if_data *prev;
3189         struct sta_info *sta, *tmp, *prev_sta;
3190         int err = 0;
3191
3192         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3193         memset(&rx, 0, sizeof(rx));
3194         rx.skb = skb;
3195         rx.local = local;
3196
3197         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3198                 local->dot11ReceivedFragmentCount++;
3199
3200         if (ieee80211_is_mgmt(fc)) {
3201                 /* drop frame if too short for header */
3202                 if (skb->len < ieee80211_hdrlen(fc))
3203                         err = -ENOBUFS;
3204                 else
3205                         err = skb_linearize(skb);
3206         } else {
3207                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3208         }
3209
3210         if (err) {
3211                 dev_kfree_skb(skb);
3212                 return;
3213         }
3214
3215         hdr = (struct ieee80211_hdr *)skb->data;
3216         ieee80211_parse_qos(&rx);
3217         ieee80211_verify_alignment(&rx);
3218
3219         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3220                      ieee80211_is_beacon(hdr->frame_control)))
3221                 ieee80211_scan_rx(local, skb);
3222
3223         if (ieee80211_is_data(fc)) {
3224                 prev_sta = NULL;
3225
3226                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3227                         if (!prev_sta) {
3228                                 prev_sta = sta;
3229                                 continue;
3230                         }
3231
3232                         rx.sta = prev_sta;
3233                         rx.sdata = prev_sta->sdata;
3234                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3235
3236                         prev_sta = sta;
3237                 }
3238
3239                 if (prev_sta) {
3240                         rx.sta = prev_sta;
3241                         rx.sdata = prev_sta->sdata;
3242
3243                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3244                                 return;
3245                         goto out;
3246                 }
3247         }
3248
3249         prev = NULL;
3250
3251         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3252                 if (!ieee80211_sdata_running(sdata))
3253                         continue;
3254
3255                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3256                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3257                         continue;
3258
3259                 /*
3260                  * frame is destined for this interface, but if it's
3261                  * not also for the previous one we handle that after
3262                  * the loop to avoid copying the SKB once too much
3263                  */
3264
3265                 if (!prev) {
3266                         prev = sdata;
3267                         continue;
3268                 }
3269
3270                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3271                 rx.sdata = prev;
3272                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3273
3274                 prev = sdata;
3275         }
3276
3277         if (prev) {
3278                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3279                 rx.sdata = prev;
3280
3281                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3282                         return;
3283         }
3284
3285  out:
3286         dev_kfree_skb(skb);
3287 }
3288
3289 /*
3290  * This is the receive path handler. It is called by a low level driver when an
3291  * 802.11 MPDU is received from the hardware.
3292  */
3293 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3294 {
3295         struct ieee80211_local *local = hw_to_local(hw);
3296         struct ieee80211_rate *rate = NULL;
3297         struct ieee80211_supported_band *sband;
3298         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3299
3300         WARN_ON_ONCE(softirq_count() == 0);
3301
3302         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3303                 goto drop;
3304
3305         sband = local->hw.wiphy->bands[status->band];
3306         if (WARN_ON(!sband))
3307                 goto drop;
3308
3309         /*
3310          * If we're suspending, it is possible although not too likely
3311          * that we'd be receiving frames after having already partially
3312          * quiesced the stack. We can't process such frames then since
3313          * that might, for example, cause stations to be added or other
3314          * driver callbacks be invoked.
3315          */
3316         if (unlikely(local->quiescing || local->suspended))
3317                 goto drop;
3318
3319         /* We might be during a HW reconfig, prevent Rx for the same reason */
3320         if (unlikely(local->in_reconfig))
3321                 goto drop;
3322
3323         /*
3324          * The same happens when we're not even started,
3325          * but that's worth a warning.
3326          */
3327         if (WARN_ON(!local->started))
3328                 goto drop;
3329
3330         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3331                 /*
3332                  * Validate the rate, unless a PLCP error means that
3333                  * we probably can't have a valid rate here anyway.
3334                  */
3335
3336                 if (status->flag & RX_FLAG_HT) {
3337                         /*
3338                          * rate_idx is MCS index, which can be [0-76]
3339                          * as documented on:
3340                          *
3341                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3342                          *
3343                          * Anything else would be some sort of driver or
3344                          * hardware error. The driver should catch hardware
3345                          * errors.
3346                          */
3347                         if (WARN(status->rate_idx > 76,
3348                                  "Rate marked as an HT rate but passed "
3349                                  "status->rate_idx is not "
3350                                  "an MCS index [0-76]: %d (0x%02x)\n",
3351                                  status->rate_idx,
3352                                  status->rate_idx))
3353                                 goto drop;
3354                 } else if (status->flag & RX_FLAG_VHT) {
3355                         if (WARN_ONCE(status->rate_idx > 9 ||
3356                                       !status->vht_nss ||
3357                                       status->vht_nss > 8,
3358                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3359                                       status->rate_idx, status->vht_nss))
3360                                 goto drop;
3361                 } else {
3362                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3363                                 goto drop;
3364                         rate = &sband->bitrates[status->rate_idx];
3365                 }
3366         }
3367
3368         status->rx_flags = 0;
3369
3370         /*
3371          * key references and virtual interfaces are protected using RCU
3372          * and this requires that we are in a read-side RCU section during
3373          * receive processing
3374          */
3375         rcu_read_lock();
3376
3377         /*
3378          * Frames with failed FCS/PLCP checksum are not returned,
3379          * all other frames are returned without radiotap header
3380          * if it was previously present.
3381          * Also, frames with less than 16 bytes are dropped.
3382          */
3383         skb = ieee80211_rx_monitor(local, skb, rate);
3384         if (!skb) {
3385                 rcu_read_unlock();
3386                 return;
3387         }
3388
3389         ieee80211_tpt_led_trig_rx(local,
3390                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3391                         skb->len);
3392         __ieee80211_rx_handle_packet(hw, skb);
3393
3394         rcu_read_unlock();
3395
3396         return;
3397  drop:
3398         kfree_skb(skb);
3399 }
3400 EXPORT_SYMBOL(ieee80211_rx);
3401
3402 /* This is a version of the rx handler that can be called from hard irq
3403  * context. Post the skb on the queue and schedule the tasklet */
3404 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3405 {
3406         struct ieee80211_local *local = hw_to_local(hw);
3407
3408         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3409
3410         skb->pkt_type = IEEE80211_RX_MSG;
3411         skb_queue_tail(&local->skb_queue, skb);
3412         tasklet_schedule(&local->tasklet);
3413 }
3414 EXPORT_SYMBOL(ieee80211_rx_irqsafe);