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 int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 642                                  struct sk_buff *skb)
 643 {
 644         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 645         __le16 fc;
 646         int hdrlen;
 647         u8 keyid;
 648
 649         fc = hdr->frame_control;
 650         hdrlen = ieee80211_hdrlen(fc);
 651
 652         if (skb->len < hdrlen + cs->hdr_len)
 653                 return -EINVAL;
 654
 655         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 656         keyid &= cs->key_idx_mask;
 657         keyid >>= cs->key_idx_shift;
 658
 659         return keyid;
 660 }
 661
 662 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 663 {
 664         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 665         char *dev_addr = rx->sdata->vif.addr;
 666
 667         if (ieee80211_is_data(hdr->frame_control)) {
 668                 if (is_multicast_ether_addr(hdr->addr1)) {
 669                         if (ieee80211_has_tods(hdr->frame_control) ||
 670                             !ieee80211_has_fromds(hdr->frame_control))
 671                                 return RX_DROP_MONITOR;
 672                         if (ether_addr_equal(hdr->addr3, dev_addr))
 673                                 return RX_DROP_MONITOR;
 674                 } else {
 675                         if (!ieee80211_has_a4(hdr->frame_control))
 676                                 return RX_DROP_MONITOR;
 677                         if (ether_addr_equal(hdr->addr4, dev_addr))
 678                                 return RX_DROP_MONITOR;
 679                 }
 680         }
 681
 682         /* If there is not an established peer link and this is not a peer link
 683          * establisment frame, beacon or probe, drop the frame.
 684          */
 685
 686         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 687                 struct ieee80211_mgmt *mgmt;
 688
 689                 if (!ieee80211_is_mgmt(hdr->frame_control))
 690                         return RX_DROP_MONITOR;
 691
 692                 if (ieee80211_is_action(hdr->frame_control)) {
 693                         u8 category;
 694
 695                         /* make sure category field is present */
 696                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 697                                 return RX_DROP_MONITOR;
 698
 699                         mgmt = (struct ieee80211_mgmt *)hdr;
 700                         category = mgmt->u.action.category;
 701                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 702                             category != WLAN_CATEGORY_SELF_PROTECTED)
 703                                 return RX_DROP_MONITOR;
 704                         return RX_CONTINUE;
 705                 }
 706
 707                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 708                     ieee80211_is_probe_resp(hdr->frame_control) ||
 709                     ieee80211_is_beacon(hdr->frame_control) ||
 710                     ieee80211_is_auth(hdr->frame_control))
 711                         return RX_CONTINUE;
 712
 713                 return RX_DROP_MONITOR;
 714         }
 715
 716         return RX_CONTINUE;
 717 }
 718
 719 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 720                                             struct tid_ampdu_rx *tid_agg_rx,
 721                                             int index,
 722                                             struct sk_buff_head *frames)
 723 {
 724         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 725         struct ieee80211_rx_status *status;
 726
 727         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 728
 729         if (!skb)
 730                 goto no_frame;
 731
 732         /* release the frame from the reorder ring buffer */
 733         tid_agg_rx->stored_mpdu_num--;
 734         tid_agg_rx->reorder_buf[index] = NULL;
 735         status = IEEE80211_SKB_RXCB(skb);
 736         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 737         __skb_queue_tail(frames, skb);
 738
 739 no_frame:
 740         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 741 }
 742
 743 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 744                                              struct tid_ampdu_rx *tid_agg_rx,
 745                                              u16 head_seq_num,
 746                                              struct sk_buff_head *frames)
 747 {
 748         int index;
 749
 750         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 751
 752         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 753                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 754                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 755                                                 frames);
 756         }
 757 }
 758
 759 /*
 760  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 761  * the skb was added to the buffer longer than this time ago, the earlier
 762  * frames that have not yet been received are assumed to be lost and the skb
 763  * can be released for processing. This may also release other skb's from the
 764  * reorder buffer if there are no additional gaps between the frames.
 765  *
 766  * Callers must hold tid_agg_rx->reorder_lock.
 767  */
 768 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 769
 770 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 771                                           struct tid_ampdu_rx *tid_agg_rx,
 772                                           struct sk_buff_head *frames)
 773 {
 774         int index, j;
 775
 776         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 777
 778         /* release the buffer until next missing frame */
 779         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 780         if (!tid_agg_rx->reorder_buf[index] &&
 781             tid_agg_rx->stored_mpdu_num) {
 782                 /*
 783                  * No buffers ready to be released, but check whether any
 784                  * frames in the reorder buffer have timed out.
 785                  */
 786                 int skipped = 1;
 787                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 788                      j = (j + 1) % tid_agg_rx->buf_size) {
 789                         if (!tid_agg_rx->reorder_buf[j]) {
 790                                 skipped++;
 791                                 continue;
 792                         }
 793                         if (skipped &&
 794                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 795                                         HT_RX_REORDER_BUF_TIMEOUT))
 796                                 goto set_release_timer;
 797
 798                         ht_dbg_ratelimited(sdata,
 799                                            "release an RX reorder frame due to timeout on earlier frames\n");
 800                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 801                                                         frames);
 802
 803                         /*
 804                          * Increment the head seq# also for the skipped slots.
 805                          */
 806                         tid_agg_rx->head_seq_num =
 807                                 (tid_agg_rx->head_seq_num +
 808                                  skipped) & IEEE80211_SN_MASK;
 809                         skipped = 0;
 810                 }
 811         } else while (tid_agg_rx->reorder_buf[index]) {
 812                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 813                                                 frames);
 814                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 815         }
 816
 817         if (tid_agg_rx->stored_mpdu_num) {
 818                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 819
 820                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 821                      j = (j + 1) % tid_agg_rx->buf_size) {
 822                         if (tid_agg_rx->reorder_buf[j])
 823                                 break;
 824                 }
 825
 826  set_release_timer:
 827
 828                 mod_timer(&tid_agg_rx->reorder_timer,
 829                           tid_agg_rx->reorder_time[j] + 1 +
 830                           HT_RX_REORDER_BUF_TIMEOUT);
 831         } else {
 832                 del_timer(&tid_agg_rx->reorder_timer);
 833         }
 834 }
 835
 836 /*
 837  * As this function belongs to the RX path it must be under
 838  * rcu_read_lock protection. It returns false if the frame
 839  * can be processed immediately, true if it was consumed.
 840  */
 841 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 842                                              struct tid_ampdu_rx *tid_agg_rx,
 843                                              struct sk_buff *skb,
 844                                              struct sk_buff_head *frames)
 845 {
 846         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 847         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 848         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 849         u16 head_seq_num, buf_size;
 850         int index;
 851         bool ret = true;
 852
 853         spin_lock(&tid_agg_rx->reorder_lock);
 854
 855         buf_size = tid_agg_rx->buf_size;
 856         head_seq_num = tid_agg_rx->head_seq_num;
 857
 858         /* frame with out of date sequence number */
 859         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 860                 dev_kfree_skb(skb);
 861                 goto out;
 862         }
 863
 864         /*
 865          * If frame the sequence number exceeds our buffering window
 866          * size release some previous frames to make room for this one.
 867          */
 868         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 869                 head_seq_num = ieee80211_sn_inc(
 870                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 871                 /* release stored frames up to new head to stack */
 872                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 873                                                  head_seq_num, frames);
 874         }
 875
 876         /* Now the new frame is always in the range of the reordering buffer */
 877
 878         index = mpdu_seq_num % tid_agg_rx->buf_size;
 879
 880         /* check if we already stored this frame */
 881         if (tid_agg_rx->reorder_buf[index]) {
 882                 dev_kfree_skb(skb);
 883                 goto out;
 884         }
 885
 886         /*
 887          * If the current MPDU is in the right order and nothing else
 888          * is stored we can process it directly, no need to buffer it.
 889          * If it is first but there's something stored, we may be able
 890          * to release frames after this one.
 891          */
 892         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 893             tid_agg_rx->stored_mpdu_num == 0) {
 894                 tid_agg_rx->head_seq_num =
 895                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 896                 ret = false;
 897                 goto out;
 898         }
 899
 900         /* put the frame in the reordering buffer */
 901         tid_agg_rx->reorder_buf[index] = skb;
 902         tid_agg_rx->reorder_time[index] = jiffies;
 903         tid_agg_rx->stored_mpdu_num++;
 904         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 905
 906  out:
 907         spin_unlock(&tid_agg_rx->reorder_lock);
 908         return ret;
 909 }
 910
 911 /*
 912  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 913  * true if the MPDU was buffered, false if it should be processed.
 914  */
 915 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 916                                        struct sk_buff_head *frames)
 917 {
 918         struct sk_buff *skb = rx->skb;
 919         struct ieee80211_local *local = rx->local;
 920         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 921         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 922         struct sta_info *sta = rx->sta;
 923         struct tid_ampdu_rx *tid_agg_rx;
 924         u16 sc;
 925         u8 tid, ack_policy;
 926
 927         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 928             is_multicast_ether_addr(hdr->addr1))
 929                 goto dont_reorder;
 930
 931         /*
 932          * filter the QoS data rx stream according to
 933          * STA/TID and check if this STA/TID is on aggregation
 934          */
 935
 936         if (!sta)
 937                 goto dont_reorder;
 938
 939         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 940                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 941         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 942
 943         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 944         if (!tid_agg_rx)
 945                 goto dont_reorder;
 946
 947         /* qos null data frames are excluded */
 948         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 949                 goto dont_reorder;
 950
 951         /* not part of a BA session */
 952         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 953             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 954                 goto dont_reorder;
 955
 956         /* not actually part of this BA session */
 957         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 958                 goto dont_reorder;
 959
 960         /* new, potentially un-ordered, ampdu frame - process it */
 961
 962         /* reset session timer */
 963         if (tid_agg_rx->timeout)
 964                 tid_agg_rx->last_rx = jiffies;
 965
 966         /* if this mpdu is fragmented - terminate rx aggregation session */
 967         sc = le16_to_cpu(hdr->seq_ctrl);
 968         if (sc & IEEE80211_SCTL_FRAG) {
 969                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 970                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 971                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 972                 return;
 973         }
 974
 975         /*
 976          * No locking needed -- we will only ever process one
 977          * RX packet at a time, and thus own tid_agg_rx. All
 978          * other code manipulating it needs to (and does) make
 979          * sure that we cannot get to it any more before doing
 980          * anything with it.
 981          */
 982         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 983                                              frames))
 984                 return;
 985
 986  dont_reorder:
 987         __skb_queue_tail(frames, skb);
 988 }
 989
 990 static ieee80211_rx_result debug_noinline
 991 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 992 {
 993         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 994         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 995
 996         /*
 997          * Drop duplicate 802.11 retransmissions
 998          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 999          */
1000         if (rx->skb->len >= 24 && rx->sta &&
1001             !ieee80211_is_ctl(hdr->frame_control) &&
1002             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1003             !is_multicast_ether_addr(hdr->addr1)) {
1004                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1005                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1006                              hdr->seq_ctrl)) {
1007                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1008                                 rx->local->dot11FrameDuplicateCount++;
1009                                 rx->sta->num_duplicates++;
1010                         }
1011                         return RX_DROP_UNUSABLE;
1012                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1014                 }
1015         }
1016
1017         if (unlikely(rx->skb->len < 16)) {
1018                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1019                 return RX_DROP_MONITOR;
1020         }
1021
1022         /* Drop disallowed frame classes based on STA auth/assoc state;
1023          * IEEE 802.11, Chap 5.5.
1024          *
1025          * mac80211 filters only based on association state, i.e. it drops
1026          * Class 3 frames from not associated stations. hostapd sends
1027          * deauth/disassoc frames when needed. In addition, hostapd is
1028          * responsible for filtering on both auth and assoc states.
1029          */
1030
1031         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1032                 return ieee80211_rx_mesh_check(rx);
1033
1034         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1035                       ieee80211_is_pspoll(hdr->frame_control)) &&
1036                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1037                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1038                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1039                 /*
1040                  * accept port control frames from the AP even when it's not
1041                  * yet marked ASSOC to prevent a race where we don't set the
1042                  * assoc bit quickly enough before it sends the first frame
1043                  */
1044                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1045                     ieee80211_is_data_present(hdr->frame_control)) {
1046                         unsigned int hdrlen;
1047                         __be16 ethertype;
1048
1049                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1050
1051                         if (rx->skb->len < hdrlen + 8)
1052                                 return RX_DROP_MONITOR;
1053
1054                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1055                         if (ethertype == rx->sdata->control_port_protocol)
1056                                 return RX_CONTINUE;
1057                 }
1058
1059                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1060                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1061                                                hdr->addr2,
1062                                                GFP_ATOMIC))
1063                         return RX_DROP_UNUSABLE;
1064
1065                 return RX_DROP_MONITOR;
1066         }
1067
1068         return RX_CONTINUE;
1069 }
1070
1071
1072 static ieee80211_rx_result debug_noinline
1073 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074 {
1075         struct ieee80211_local *local;
1076         struct ieee80211_hdr *hdr;
1077         struct sk_buff *skb;
1078
1079         local = rx->local;
1080         skb = rx->skb;
1081         hdr = (struct ieee80211_hdr *) skb->data;
1082
1083         if (!local->pspolling)
1084                 return RX_CONTINUE;
1085
1086         if (!ieee80211_has_fromds(hdr->frame_control))
1087                 /* this is not from AP */
1088                 return RX_CONTINUE;
1089
1090         if (!ieee80211_is_data(hdr->frame_control))
1091                 return RX_CONTINUE;
1092
1093         if (!ieee80211_has_moredata(hdr->frame_control)) {
1094                 /* AP has no more frames buffered for us */
1095                 local->pspolling = false;
1096                 return RX_CONTINUE;
1097         }
1098
1099         /* more data bit is set, let's request a new frame from the AP */
1100         ieee80211_send_pspoll(local, rx->sdata);
1101
1102         return RX_CONTINUE;
1103 }
1104
1105 static void sta_ps_start(struct sta_info *sta)
1106 {
1107         struct ieee80211_sub_if_data *sdata = sta->sdata;
1108         struct ieee80211_local *local = sdata->local;
1109         struct ps_data *ps;
1110
1111         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1112             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1113                 ps = &sdata->bss->ps;
1114         else
1115                 return;
1116
1117         atomic_inc(&ps->num_sta_ps);
1118         set_sta_flag(sta, WLAN_STA_PS_STA);
1119         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1120                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1121         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1122                sta->sta.addr, sta->sta.aid);
1123 }
1124
1125 static void sta_ps_end(struct sta_info *sta)
1126 {
1127         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1128                sta->sta.addr, sta->sta.aid);
1129
1130         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1131                 /*
1132                  * Clear the flag only if the other one is still set
1133                  * so that the TX path won't start TX'ing new frames
1134                  * directly ... In the case that the driver flag isn't
1135                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1136                  */
1137                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1138                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1139                        sta->sta.addr, sta->sta.aid);
1140                 return;
1141         }
1142
1143         ieee80211_sta_ps_deliver_wakeup(sta);
1144 }
1145
1146 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1147 {
1148         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1149         bool in_ps;
1150
1151         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1152
1153         /* Don't let the same PS state be set twice */
1154         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1155         if ((start && in_ps) || (!start && !in_ps))
1156                 return -EINVAL;
1157
1158         if (start)
1159                 sta_ps_start(sta_inf);
1160         else
1161                 sta_ps_end(sta_inf);
1162
1163         return 0;
1164 }
1165 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1166
1167 static ieee80211_rx_result debug_noinline
1168 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1169 {
1170         struct ieee80211_sub_if_data *sdata = rx->sdata;
1171         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1172         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1173         int tid, ac;
1174
1175         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1176                 return RX_CONTINUE;
1177
1178         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1179             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1180                 return RX_CONTINUE;
1181
1182         /*
1183          * The device handles station powersave, so don't do anything about
1184          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1185          * it to mac80211 since they're handled.)
1186          */
1187         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1188                 return RX_CONTINUE;
1189
1190         /*
1191          * Don't do anything if the station isn't already asleep. In
1192          * the uAPSD case, the station will probably be marked asleep,
1193          * in the PS-Poll case the station must be confused ...
1194          */
1195         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1196                 return RX_CONTINUE;
1197
1198         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1199                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1200                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1201                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1202                         else
1203                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1204                 }
1205
1206                 /* Free PS Poll skb here instead of returning RX_DROP that would
1207                  * count as an dropped frame. */
1208                 dev_kfree_skb(rx->skb);
1209
1210                 return RX_QUEUED;
1211         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1212                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1213                    ieee80211_has_pm(hdr->frame_control) &&
1214                    (ieee80211_is_data_qos(hdr->frame_control) ||
1215                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1216                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1217                 ac = ieee802_1d_to_ac[tid & 7];
1218
1219                 /*
1220                  * If this AC is not trigger-enabled do nothing.
1221                  *
1222                  * NB: This could/should check a separate bitmap of trigger-
1223                  * enabled queues, but for now we only implement uAPSD w/o
1224                  * TSPEC changes to the ACs, so they're always the same.
1225                  */
1226                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1227                         return RX_CONTINUE;
1228
1229                 /* if we are in a service period, do nothing */
1230                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1231                         return RX_CONTINUE;
1232
1233                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1234                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1235                 else
1236                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1237         }
1238
1239         return RX_CONTINUE;
1240 }
1241
1242 static ieee80211_rx_result debug_noinline
1243 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1244 {
1245         struct sta_info *sta = rx->sta;
1246         struct sk_buff *skb = rx->skb;
1247         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1248         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1249         int i;
1250
1251         if (!sta)
1252                 return RX_CONTINUE;
1253
1254         /*
1255          * Update last_rx only for IBSS packets which are for the current
1256          * BSSID and for station already AUTHORIZED to avoid keeping the
1257          * current IBSS network alive in cases where other STAs start
1258          * using different BSSID. This will also give the station another
1259          * chance to restart the authentication/authorization in case
1260          * something went wrong the first time.
1261          */
1262         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1263                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1264                                                 NL80211_IFTYPE_ADHOC);
1265                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1266                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1267                         sta->last_rx = jiffies;
1268                         if (ieee80211_is_data(hdr->frame_control)) {
1269                                 sta->last_rx_rate_idx = status->rate_idx;
1270                                 sta->last_rx_rate_flag = status->flag;
1271                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1272                         }
1273                 }
1274         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1275                 /*
1276                  * Mesh beacons will update last_rx when if they are found to
1277                  * match the current local configuration when processed.
1278                  */
1279                 sta->last_rx = jiffies;
1280                 if (ieee80211_is_data(hdr->frame_control)) {
1281                         sta->last_rx_rate_idx = status->rate_idx;
1282                         sta->last_rx_rate_flag = status->flag;
1283                         sta->last_rx_rate_vht_nss = status->vht_nss;
1284                 }
1285         }
1286
1287         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1288                 return RX_CONTINUE;
1289
1290         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1291                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1292
1293         sta->rx_fragments++;
1294         sta->rx_bytes += rx->skb->len;
1295         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1296                 sta->last_signal = status->signal;
1297                 ewma_add(&sta->avg_signal, -status->signal);
1298         }
1299
1300         if (status->chains) {
1301                 sta->chains = status->chains;
1302                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1303                         int signal = status->chain_signal[i];
1304
1305                         if (!(status->chains & BIT(i)))
1306                                 continue;
1307
1308                         sta->chain_signal_last[i] = signal;
1309                         ewma_add(&sta->chain_signal_avg[i], -signal);
1310                 }
1311         }
1312
1313         /*
1314          * Change STA power saving mode only at the end of a frame
1315          * exchange sequence.
1316          */
1317         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1318             !ieee80211_has_morefrags(hdr->frame_control) &&
1319             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1320             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1321              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1322                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1323                         /*
1324                          * Ignore doze->wake transitions that are
1325                          * indicated by non-data frames, the standard
1326                          * is unclear here, but for example going to
1327                          * PS mode and then scanning would cause a
1328                          * doze->wake transition for the probe request,
1329                          * and that is clearly undesirable.
1330                          */
1331                         if (ieee80211_is_data(hdr->frame_control) &&
1332                             !ieee80211_has_pm(hdr->frame_control))
1333                                 sta_ps_end(sta);
1334                 } else {
1335                         if (ieee80211_has_pm(hdr->frame_control))
1336                                 sta_ps_start(sta);
1337                 }
1338         }
1339
1340         /* mesh power save support */
1341         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1342                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1343
1344         /*
1345          * Drop (qos-)data::nullfunc frames silently, since they
1346          * are used only to control station power saving mode.
1347          */
1348         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1349             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1350                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1351
1352                 /*
1353                  * If we receive a 4-addr nullfunc frame from a STA
1354                  * that was not moved to a 4-addr STA vlan yet send
1355                  * the event to userspace and for older hostapd drop
1356                  * the frame to the monitor interface.
1357                  */
1358                 if (ieee80211_has_a4(hdr->frame_control) &&
1359                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1360                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1361                       !rx->sdata->u.vlan.sta))) {
1362                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1363                                 cfg80211_rx_unexpected_4addr_frame(
1364                                         rx->sdata->dev, sta->sta.addr,
1365                                         GFP_ATOMIC);
1366                         return RX_DROP_MONITOR;
1367                 }
1368                 /*
1369                  * Update counter and free packet here to avoid
1370                  * counting this as a dropped packed.
1371                  */
1372                 sta->rx_packets++;
1373                 dev_kfree_skb(rx->skb);
1374                 return RX_QUEUED;
1375         }
1376
1377         return RX_CONTINUE;
1378 } /* ieee80211_rx_h_sta_process */
1379
1380 static ieee80211_rx_result debug_noinline
1381 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1382 {
1383         struct sk_buff *skb = rx->skb;
1384         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1385         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1386         int keyidx;
1387         int hdrlen;
1388         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1389         struct ieee80211_key *sta_ptk = NULL;
1390         int mmie_keyidx = -1;
1391         __le16 fc;
1392         const struct ieee80211_cipher_scheme *cs = NULL;
1393
1394         /*
1395          * Key selection 101
1396          *
1397          * There are four types of keys:
1398          *  - GTK (group keys)
1399          *  - IGTK (group keys for management frames)
1400          *  - PTK (pairwise keys)
1401          *  - STK (station-to-station pairwise keys)
1402          *
1403          * When selecting a key, we have to distinguish between multicast
1404          * (including broadcast) and unicast frames, the latter can only
1405          * use PTKs and STKs while the former always use GTKs and IGTKs.
1406          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1407          * unicast frames can also use key indices like GTKs. Hence, if we
1408          * don't have a PTK/STK we check the key index for a WEP key.
1409          *
1410          * Note that in a regular BSS, multicast frames are sent by the
1411          * AP only, associated stations unicast the frame to the AP first
1412          * which then multicasts it on their behalf.
1413          *
1414          * There is also a slight problem in IBSS mode: GTKs are negotiated
1415          * with each station, that is something we don't currently handle.
1416          * The spec seems to expect that one negotiates the same key with
1417          * every station but there's no such requirement; VLANs could be
1418          * possible.
1419          */
1420
1421         /*
1422          * No point in finding a key and decrypting if the frame is neither
1423          * addressed to us nor a multicast frame.
1424          */
1425         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1426                 return RX_CONTINUE;
1427
1428         /* start without a key */
1429         rx->key = NULL;
1430         fc = hdr->frame_control;
1431
1432         if (rx->sta) {
1433                 int keyid = rx->sta->ptk_idx;
1434
1435                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1436                         cs = rx->sta->cipher_scheme;
1437                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1438                         if (unlikely(keyid < 0))
1439                                 return RX_DROP_UNUSABLE;
1440                 }
1441                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1442         }
1443
1444         if (!ieee80211_has_protected(fc))
1445                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1446
1447         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1448                 rx->key = sta_ptk;
1449                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1450                     (status->flag & RX_FLAG_IV_STRIPPED))
1451                         return RX_CONTINUE;
1452                 /* Skip decryption if the frame is not protected. */
1453                 if (!ieee80211_has_protected(fc))
1454                         return RX_CONTINUE;
1455         } else if (mmie_keyidx >= 0) {
1456                 /* Broadcast/multicast robust management frame / BIP */
1457                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1458                     (status->flag & RX_FLAG_IV_STRIPPED))
1459                         return RX_CONTINUE;
1460
1461                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1462                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1463                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1464                 if (rx->sta)
1465                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1466                 if (!rx->key)
1467                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1468         } else if (!ieee80211_has_protected(fc)) {
1469                 /*
1470                  * The frame was not protected, so skip decryption. However, we
1471                  * need to set rx->key if there is a key that could have been
1472                  * used so that the frame may be dropped if encryption would
1473                  * have been expected.
1474                  */
1475                 struct ieee80211_key *key = NULL;
1476                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1477                 int i;
1478
1479                 if (ieee80211_is_mgmt(fc) &&
1480                     is_multicast_ether_addr(hdr->addr1) &&
1481                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1482                         rx->key = key;
1483                 else {
1484                         if (rx->sta) {
1485                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1486                                         key = rcu_dereference(rx->sta->gtk[i]);
1487                                         if (key)
1488                                                 break;
1489                                 }
1490                         }
1491                         if (!key) {
1492                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1493                                         key = rcu_dereference(sdata->keys[i]);
1494                                         if (key)
1495                                                 break;
1496                                 }
1497                         }
1498                         if (key)
1499                                 rx->key = key;
1500                 }
1501                 return RX_CONTINUE;
1502         } else {
1503                 u8 keyid;
1504
1505                 /*
1506                  * The device doesn't give us the IV so we won't be
1507                  * able to look up the key. That's ok though, we
1508                  * don't need to decrypt the frame, we just won't
1509                  * be able to keep statistics accurate.
1510                  * Except for key threshold notifications, should
1511                  * we somehow allow the driver to tell us which key
1512                  * the hardware used if this flag is set?
1513                  */
1514                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1515                     (status->flag & RX_FLAG_IV_STRIPPED))
1516                         return RX_CONTINUE;
1517
1518                 hdrlen = ieee80211_hdrlen(fc);
1519
1520                 if (cs) {
1521                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1522
1523                         if (unlikely(keyidx < 0))
1524                                 return RX_DROP_UNUSABLE;
1525                 } else {
1526                         if (rx->skb->len < 8 + hdrlen)
1527                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1528                         /*
1529                          * no need to call ieee80211_wep_get_keyidx,
1530                          * it verifies a bunch of things we've done already
1531                          */
1532                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1533                         keyidx = keyid >> 6;
1534                 }
1535
1536                 /* check per-station GTK first, if multicast packet */
1537                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1538                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1539
1540                 /* if not found, try default key */
1541                 if (!rx->key) {
1542                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1543
1544                         /*
1545                          * RSNA-protected unicast frames should always be
1546                          * sent with pairwise or station-to-station keys,
1547                          * but for WEP we allow using a key index as well.
1548                          */
1549                         if (rx->key &&
1550                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1551                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1552                             !is_multicast_ether_addr(hdr->addr1))
1553                                 rx->key = NULL;
1554                 }
1555         }
1556
1557         if (rx->key) {
1558                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1559                         return RX_DROP_MONITOR;
1560
1561                 rx->key->tx_rx_count++;
1562                 /* TODO: add threshold stuff again */
1563         } else {
1564                 return RX_DROP_MONITOR;
1565         }
1566
1567         switch (rx->key->conf.cipher) {
1568         case WLAN_CIPHER_SUITE_WEP40:
1569         case WLAN_CIPHER_SUITE_WEP104:
1570                 result = ieee80211_crypto_wep_decrypt(rx);
1571                 break;
1572         case WLAN_CIPHER_SUITE_TKIP:
1573                 result = ieee80211_crypto_tkip_decrypt(rx);
1574                 break;
1575         case WLAN_CIPHER_SUITE_CCMP:
1576                 result = ieee80211_crypto_ccmp_decrypt(rx);
1577                 break;
1578         case WLAN_CIPHER_SUITE_AES_CMAC:
1579                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1580                 break;
1581         default:
1582                 result = ieee80211_crypto_hw_decrypt(rx);
1583         }
1584
1585         /* the hdr variable is invalid after the decrypt handlers */
1586
1587         /* either the frame has been decrypted or will be dropped */
1588         status->flag |= RX_FLAG_DECRYPTED;
1589
1590         return result;
1591 }
1592
1593 static inline struct ieee80211_fragment_entry *
1594 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1595                          unsigned int frag, unsigned int seq, int rx_queue,
1596                          struct sk_buff **skb)
1597 {
1598         struct ieee80211_fragment_entry *entry;
1599
1600         entry = &sdata->fragments[sdata->fragment_next++];
1601         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1602                 sdata->fragment_next = 0;
1603
1604         if (!skb_queue_empty(&entry->skb_list))
1605                 __skb_queue_purge(&entry->skb_list);
1606
1607         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1608         *skb = NULL;
1609         entry->first_frag_time = jiffies;
1610         entry->seq = seq;
1611         entry->rx_queue = rx_queue;
1612         entry->last_frag = frag;
1613         entry->ccmp = 0;
1614         entry->extra_len = 0;
1615
1616         return entry;
1617 }
1618
1619 static inline struct ieee80211_fragment_entry *
1620 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1621                           unsigned int frag, unsigned int seq,
1622                           int rx_queue, struct ieee80211_hdr *hdr)
1623 {
1624         struct ieee80211_fragment_entry *entry;
1625         int i, idx;
1626
1627         idx = sdata->fragment_next;
1628         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1629                 struct ieee80211_hdr *f_hdr;
1630
1631                 idx--;
1632                 if (idx < 0)
1633                         idx = IEEE80211_FRAGMENT_MAX - 1;
1634
1635                 entry = &sdata->fragments[idx];
1636                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1637                     entry->rx_queue != rx_queue ||
1638                     entry->last_frag + 1 != frag)
1639                         continue;
1640
1641                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1642
1643                 /*
1644                  * Check ftype and addresses are equal, else check next fragment
1645                  */
1646                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1647                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1648                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1649                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1650                         continue;
1651
1652                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1653                         __skb_queue_purge(&entry->skb_list);
1654                         continue;
1655                 }
1656                 return entry;
1657         }
1658
1659         return NULL;
1660 }
1661
1662 static ieee80211_rx_result debug_noinline
1663 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1664 {
1665         struct ieee80211_hdr *hdr;
1666         u16 sc;
1667         __le16 fc;
1668         unsigned int frag, seq;
1669         struct ieee80211_fragment_entry *entry;
1670         struct sk_buff *skb;
1671         struct ieee80211_rx_status *status;
1672
1673         hdr = (struct ieee80211_hdr *)rx->skb->data;
1674         fc = hdr->frame_control;
1675
1676         if (ieee80211_is_ctl(fc))
1677                 return RX_CONTINUE;
1678
1679         sc = le16_to_cpu(hdr->seq_ctrl);
1680         frag = sc & IEEE80211_SCTL_FRAG;
1681
1682         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1683                 goto out;
1684
1685         if (is_multicast_ether_addr(hdr->addr1)) {
1686                 rx->local->dot11MulticastReceivedFrameCount++;
1687                 goto out;
1688         }
1689
1690         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1691
1692         if (skb_linearize(rx->skb))
1693                 return RX_DROP_UNUSABLE;
1694
1695         /*
1696          *  skb_linearize() might change the skb->data and
1697          *  previously cached variables (in this case, hdr) need to
1698          *  be refreshed with the new data.
1699          */
1700         hdr = (struct ieee80211_hdr *)rx->skb->data;
1701         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1702
1703         if (frag == 0) {
1704                 /* This is the first fragment of a new frame. */
1705                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1706                                                  rx->seqno_idx, &(rx->skb));
1707                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1708                     ieee80211_has_protected(fc)) {
1709                         int queue = rx->security_idx;
1710                         /* Store CCMP PN so that we can verify that the next
1711                          * fragment has a sequential PN value. */
1712                         entry->ccmp = 1;
1713                         memcpy(entry->last_pn,
1714                                rx->key->u.ccmp.rx_pn[queue],
1715                                IEEE80211_CCMP_PN_LEN);
1716                 }
1717                 return RX_QUEUED;
1718         }
1719
1720         /* This is a fragment for a frame that should already be pending in
1721          * fragment cache. Add this fragment to the end of the pending entry.
1722          */
1723         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1724                                           rx->seqno_idx, hdr);
1725         if (!entry) {
1726                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1727                 return RX_DROP_MONITOR;
1728         }
1729
1730         /* Verify that MPDUs within one MSDU have sequential PN values.
1731          * (IEEE 802.11i, 8.3.3.4.5) */
1732         if (entry->ccmp) {
1733                 int i;
1734                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1735                 int queue;
1736                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1737                         return RX_DROP_UNUSABLE;
1738                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1739                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1740                         pn[i]++;
1741                         if (pn[i])
1742                                 break;
1743                 }
1744                 queue = rx->security_idx;
1745                 rpn = rx->key->u.ccmp.rx_pn[queue];
1746                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1747                         return RX_DROP_UNUSABLE;
1748                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1749         }
1750
1751         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1752         __skb_queue_tail(&entry->skb_list, rx->skb);
1753         entry->last_frag = frag;
1754         entry->extra_len += rx->skb->len;
1755         if (ieee80211_has_morefrags(fc)) {
1756                 rx->skb = NULL;
1757                 return RX_QUEUED;
1758         }
1759
1760         rx->skb = __skb_dequeue(&entry->skb_list);
1761         if (skb_tailroom(rx->skb) < entry->extra_len) {
1762                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1763                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1764                                               GFP_ATOMIC))) {
1765                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1766                         __skb_queue_purge(&entry->skb_list);
1767                         return RX_DROP_UNUSABLE;
1768                 }
1769         }
1770         while ((skb = __skb_dequeue(&entry->skb_list))) {
1771                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1772                 dev_kfree_skb(skb);
1773         }
1774
1775         /* Complete frame has been reassembled - process it now */
1776         status = IEEE80211_SKB_RXCB(rx->skb);
1777         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1778
1779  out:
1780         if (rx->sta)
1781                 rx->sta->rx_packets++;
1782         ieee80211_led_rx(rx->local);
1783         return RX_CONTINUE;
1784 }
1785
1786 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1787 {
1788         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1789                 return -EACCES;
1790
1791         return 0;
1792 }
1793
1794 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1795 {
1796         struct sk_buff *skb = rx->skb;
1797         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1798
1799         /*
1800          * Pass through unencrypted frames if the hardware has
1801          * decrypted them already.
1802          */
1803         if (status->flag & RX_FLAG_DECRYPTED)
1804                 return 0;
1805
1806         /* Drop unencrypted frames if key is set. */
1807         if (unlikely(!ieee80211_has_protected(fc) &&
1808                      !ieee80211_is_nullfunc(fc) &&
1809                      ieee80211_is_data(fc) &&
1810                      (rx->key || rx->sdata->drop_unencrypted)))
1811                 return -EACCES;
1812
1813         return 0;
1814 }
1815
1816 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1817 {
1818         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1819         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1820         __le16 fc = hdr->frame_control;
1821
1822         /*
1823          * Pass through unencrypted frames if the hardware has
1824          * decrypted them already.
1825          */
1826         if (status->flag & RX_FLAG_DECRYPTED)
1827                 return 0;
1828
1829         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1830                 if (unlikely(!ieee80211_has_protected(fc) &&
1831                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1832                              rx->key)) {
1833                         if (ieee80211_is_deauth(fc) ||
1834                             ieee80211_is_disassoc(fc))
1835                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1836                                                              rx->skb->data,
1837                                                              rx->skb->len);
1838                         return -EACCES;
1839                 }
1840                 /* BIP does not use Protected field, so need to check MMIE */
1841                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1842                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1843                         if (ieee80211_is_deauth(fc) ||
1844                             ieee80211_is_disassoc(fc))
1845                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1846                                                              rx->skb->data,
1847                                                              rx->skb->len);
1848                         return -EACCES;
1849                 }
1850                 /*
1851                  * When using MFP, Action frames are not allowed prior to
1852                  * having configured keys.
1853                  */
1854                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1855                              ieee80211_is_robust_mgmt_frame(
1856                                      (struct ieee80211_hdr *) rx->skb->data)))
1857                         return -EACCES;
1858         }
1859
1860         return 0;
1861 }
1862
1863 static int
1864 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1865 {
1866         struct ieee80211_sub_if_data *sdata = rx->sdata;
1867         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1868         bool check_port_control = false;
1869         struct ethhdr *ehdr;
1870         int ret;
1871
1872         *port_control = false;
1873         if (ieee80211_has_a4(hdr->frame_control) &&
1874             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1875                 return -1;
1876
1877         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1878             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1879
1880                 if (!sdata->u.mgd.use_4addr)
1881                         return -1;
1882                 else
1883                         check_port_control = true;
1884         }
1885
1886         if (is_multicast_ether_addr(hdr->addr1) &&
1887             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1888                 return -1;
1889
1890         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1891         if (ret < 0)
1892                 return ret;
1893
1894         ehdr = (struct ethhdr *) rx->skb->data;
1895         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1896                 *port_control = true;
1897         else if (check_port_control)
1898                 return -1;
1899
1900         return 0;
1901 }
1902
1903 /*
1904  * requires that rx->skb is a frame with ethernet header
1905  */
1906 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1907 {
1908         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1909                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1910         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1911
1912         /*
1913          * Allow EAPOL frames to us/the PAE group address regardless
1914          * of whether the frame was encrypted or not.
1915          */
1916         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1917             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1918              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1919                 return true;
1920
1921         if (ieee80211_802_1x_port_control(rx) ||
1922             ieee80211_drop_unencrypted(rx, fc))
1923                 return false;
1924
1925         return true;
1926 }
1927
1928 /*
1929  * requires that rx->skb is a frame with ethernet header
1930  */
1931 static void
1932 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1933 {
1934         struct ieee80211_sub_if_data *sdata = rx->sdata;
1935         struct net_device *dev = sdata->dev;
1936         struct sk_buff *skb, *xmit_skb;
1937         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1938         struct sta_info *dsta;
1939         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1940
1941         skb = rx->skb;
1942         xmit_skb = NULL;
1943
1944         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1945              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1946             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1947             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1948             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1949                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1950                         /*
1951                          * send multicast frames both to higher layers in
1952                          * local net stack and back to the wireless medium
1953                          */
1954                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1955                         if (!xmit_skb)
1956                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1957                                                     dev->name);
1958                 } else {
1959                         dsta = sta_info_get(sdata, skb->data);
1960                         if (dsta) {
1961                                 /*
1962                                  * The destination station is associated to
1963                                  * this AP (in this VLAN), so send the frame
1964                                  * directly to it and do not pass it to local
1965                                  * net stack.
1966                                  */
1967                                 xmit_skb = skb;
1968                                 skb = NULL;
1969                         }
1970                 }
1971         }
1972
1973 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1974         if (skb) {
1975                 /* 'align' will only take the values 0 or 2 here since all
1976                  * frames are required to be aligned to 2-byte boundaries
1977                  * when being passed to mac80211; the code here works just
1978                  * as well if that isn't true, but mac80211 assumes it can
1979                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1980                  */
1981                 int align;
1982
1983                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1984                 if (align) {
1985                         if (WARN_ON(skb_headroom(skb) < 3)) {
1986                                 dev_kfree_skb(skb);
1987                                 skb = NULL;
1988                         } else {
1989                                 u8 *data = skb->data;
1990                                 size_t len = skb_headlen(skb);
1991                                 skb->data -= align;
1992                                 memmove(skb->data, data, len);
1993                                 skb_set_tail_pointer(skb, len);
1994                         }
1995                 }
1996         }
1997 #endif
1998
1999         if (skb) {
2000                 /* deliver to local stack */
2001                 skb->protocol = eth_type_trans(skb, dev);
2002                 memset(skb->cb, 0, sizeof(skb->cb));
2003                 netif_receive_skb(skb);
2004         }
2005
2006         if (xmit_skb) {
2007                 /*
2008                  * Send to wireless media and increase priority by 256 to
2009                  * keep the received priority instead of reclassifying
2010                  * the frame (see cfg80211_classify8021d).
2011                  */
2012                 xmit_skb->priority += 256;
2013                 xmit_skb->protocol = htons(ETH_P_802_3);
2014                 skb_reset_network_header(xmit_skb);
2015                 skb_reset_mac_header(xmit_skb);
2016                 dev_queue_xmit(xmit_skb);
2017         }
2018 }
2019
2020 static ieee80211_rx_result debug_noinline
2021 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2022 {
2023         struct net_device *dev = rx->sdata->dev;
2024         struct sk_buff *skb = rx->skb;
2025         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2026         __le16 fc = hdr->frame_control;
2027         struct sk_buff_head frame_list;
2028         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2029
2030         if (unlikely(!ieee80211_is_data(fc)))
2031                 return RX_CONTINUE;
2032
2033         if (unlikely(!ieee80211_is_data_present(fc)))
2034                 return RX_DROP_MONITOR;
2035
2036         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2037                 return RX_CONTINUE;
2038
2039         if (ieee80211_has_a4(hdr->frame_control) &&
2040             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2041             !rx->sdata->u.vlan.sta)
2042                 return RX_DROP_UNUSABLE;
2043
2044         if (is_multicast_ether_addr(hdr->addr1) &&
2045             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2046               rx->sdata->u.vlan.sta) ||
2047              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2048               rx->sdata->u.mgd.use_4addr)))
2049                 return RX_DROP_UNUSABLE;
2050
2051         skb->dev = dev;
2052         __skb_queue_head_init(&frame_list);
2053
2054         if (skb_linearize(skb))
2055                 return RX_DROP_UNUSABLE;
2056
2057         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2058                                  rx->sdata->vif.type,
2059                                  rx->local->hw.extra_tx_headroom, true);
2060
2061         while (!skb_queue_empty(&frame_list)) {
2062                 rx->skb = __skb_dequeue(&frame_list);
2063
2064                 if (!ieee80211_frame_allowed(rx, fc)) {
2065                         dev_kfree_skb(rx->skb);
2066                         continue;
2067                 }
2068                 dev->stats.rx_packets++;
2069                 dev->stats.rx_bytes += rx->skb->len;
2070
2071                 ieee80211_deliver_skb(rx);
2072         }
2073
2074         return RX_QUEUED;
2075 }
2076
2077 #ifdef CONFIG_MAC80211_MESH
2078 static ieee80211_rx_result
2079 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2080 {
2081         struct ieee80211_hdr *fwd_hdr, *hdr;
2082         struct ieee80211_tx_info *info;
2083         struct ieee80211s_hdr *mesh_hdr;
2084         struct sk_buff *skb = rx->skb, *fwd_skb;
2085         struct ieee80211_local *local = rx->local;
2086         struct ieee80211_sub_if_data *sdata = rx->sdata;
2087         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2088         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2089         u16 q, hdrlen;
2090
2091         hdr = (struct ieee80211_hdr *) skb->data;
2092         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2093
2094         /* make sure fixed part of mesh header is there, also checks skb len */
2095         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2096                 return RX_DROP_MONITOR;
2097
2098         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2099
2100         /* make sure full mesh header is there, also checks skb len */
2101         if (!pskb_may_pull(rx->skb,
2102                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2103                 return RX_DROP_MONITOR;
2104
2105         /* reload pointers */
2106         hdr = (struct ieee80211_hdr *) skb->data;
2107         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2108
2109         /* frame is in RMC, don't forward */
2110         if (ieee80211_is_data(hdr->frame_control) &&
2111             is_multicast_ether_addr(hdr->addr1) &&
2112             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2113                 return RX_DROP_MONITOR;
2114
2115         if (!ieee80211_is_data(hdr->frame_control) ||
2116             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2117                 return RX_CONTINUE;
2118
2119         if (!mesh_hdr->ttl)
2120                 return RX_DROP_MONITOR;
2121
2122         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2123                 struct mesh_path *mppath;
2124                 char *proxied_addr;
2125                 char *mpp_addr;
2126
2127                 if (is_multicast_ether_addr(hdr->addr1)) {
2128                         mpp_addr = hdr->addr3;
2129                         proxied_addr = mesh_hdr->eaddr1;
2130                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2131                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2132                         mpp_addr = hdr->addr4;
2133                         proxied_addr = mesh_hdr->eaddr2;
2134                 } else {
2135                         return RX_DROP_MONITOR;
2136                 }
2137
2138                 rcu_read_lock();
2139                 mppath = mpp_path_lookup(sdata, proxied_addr);
2140                 if (!mppath) {
2141                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2142                 } else {
2143                         spin_lock_bh(&mppath->state_lock);
2144                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2145                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2146                         spin_unlock_bh(&mppath->state_lock);
2147                 }
2148                 rcu_read_unlock();
2149         }
2150
2151         /* Frame has reached destination.  Don't forward */
2152         if (!is_multicast_ether_addr(hdr->addr1) &&
2153             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2154                 return RX_CONTINUE;
2155
2156         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2157         if (ieee80211_queue_stopped(&local->hw, q)) {
2158                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2159                 return RX_DROP_MONITOR;
2160         }
2161         skb_set_queue_mapping(skb, q);
2162
2163         if (!--mesh_hdr->ttl) {
2164                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2165                 goto out;
2166         }
2167
2168         if (!ifmsh->mshcfg.dot11MeshForwarding)
2169                 goto out;
2170
2171         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2172         if (!fwd_skb) {
2173                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2174                                     sdata->name);
2175                 goto out;
2176         }
2177
2178         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2179         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2180         info = IEEE80211_SKB_CB(fwd_skb);
2181         memset(info, 0, sizeof(*info));
2182         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2183         info->control.vif = &rx->sdata->vif;
2184         info->control.jiffies = jiffies;
2185         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2186                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2187                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2188                 /* update power mode indication when forwarding */
2189                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2190         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2191                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2192                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2193         } else {
2194                 /* unable to resolve next hop */
2195                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2196                                    fwd_hdr->addr3, 0,
2197                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2198                                    fwd_hdr->addr2);
2199                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2200                 kfree_skb(fwd_skb);
2201                 return RX_DROP_MONITOR;
2202         }
2203
2204         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2205         ieee80211_add_pending_skb(local, fwd_skb);
2206  out:
2207         if (is_multicast_ether_addr(hdr->addr1) ||
2208             sdata->dev->flags & IFF_PROMISC)
2209                 return RX_CONTINUE;
2210         else
2211                 return RX_DROP_MONITOR;
2212 }
2213 #endif
2214
2215 static ieee80211_rx_result debug_noinline
2216 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2217 {
2218         struct ieee80211_sub_if_data *sdata = rx->sdata;
2219         struct ieee80211_local *local = rx->local;
2220         struct net_device *dev = sdata->dev;
2221         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2222         __le16 fc = hdr->frame_control;
2223         bool port_control;
2224         int err;
2225
2226         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2227                 return RX_CONTINUE;
2228
2229         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2230                 return RX_DROP_MONITOR;
2231
2232         /*
2233          * Send unexpected-4addr-frame event to hostapd. For older versions,
2234          * also drop the frame to cooked monitor interfaces.
2235          */
2236         if (ieee80211_has_a4(hdr->frame_control) &&
2237             sdata->vif.type == NL80211_IFTYPE_AP) {
2238                 if (rx->sta &&
2239                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2240                         cfg80211_rx_unexpected_4addr_frame(
2241                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2242                 return RX_DROP_MONITOR;
2243         }
2244
2245         err = __ieee80211_data_to_8023(rx, &port_control);
2246         if (unlikely(err))
2247                 return RX_DROP_UNUSABLE;
2248
2249         if (!ieee80211_frame_allowed(rx, fc))
2250                 return RX_DROP_MONITOR;
2251
2252         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2253             unlikely(port_control) && sdata->bss) {
2254                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2255                                      u.ap);
2256                 dev = sdata->dev;
2257                 rx->sdata = sdata;
2258         }
2259
2260         rx->skb->dev = dev;
2261
2262         dev->stats.rx_packets++;
2263         dev->stats.rx_bytes += rx->skb->len;
2264
2265         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2266             !is_multicast_ether_addr(
2267                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2268             (!local->scanning &&
2269              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2270                         mod_timer(&local->dynamic_ps_timer, jiffies +
2271                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2272         }
2273
2274         ieee80211_deliver_skb(rx);
2275
2276         return RX_QUEUED;
2277 }
2278
2279 static ieee80211_rx_result debug_noinline
2280 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2281 {
2282         struct sk_buff *skb = rx->skb;
2283         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2284         struct tid_ampdu_rx *tid_agg_rx;
2285         u16 start_seq_num;
2286         u16 tid;
2287
2288         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2289                 return RX_CONTINUE;
2290
2291         if (ieee80211_is_back_req(bar->frame_control)) {
2292                 struct {
2293                         __le16 control, start_seq_num;
2294                 } __packed bar_data;
2295
2296                 if (!rx->sta)
2297                         return RX_DROP_MONITOR;
2298
2299                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2300                                   &bar_data, sizeof(bar_data)))
2301                         return RX_DROP_MONITOR;
2302
2303                 tid = le16_to_cpu(bar_data.control) >> 12;
2304
2305                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2306                 if (!tid_agg_rx)
2307                         return RX_DROP_MONITOR;
2308
2309                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2310
2311                 /* reset session timer */
2312                 if (tid_agg_rx->timeout)
2313                         mod_timer(&tid_agg_rx->session_timer,
2314                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2315
2316                 spin_lock(&tid_agg_rx->reorder_lock);
2317                 /* release stored frames up to start of BAR */
2318                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2319                                                  start_seq_num, frames);
2320                 spin_unlock(&tid_agg_rx->reorder_lock);
2321
2322                 kfree_skb(skb);
2323                 return RX_QUEUED;
2324         }
2325
2326         /*
2327          * After this point, we only want management frames,
2328          * so we can drop all remaining control frames to
2329          * cooked monitor interfaces.
2330          */
2331         return RX_DROP_MONITOR;
2332 }
2333
2334 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2335                                            struct ieee80211_mgmt *mgmt,
2336                                            size_t len)
2337 {
2338         struct ieee80211_local *local = sdata->local;
2339         struct sk_buff *skb;
2340         struct ieee80211_mgmt *resp;
2341
2342         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2343                 /* Not to own unicast address */
2344                 return;
2345         }
2346
2347         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2348             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2349                 /* Not from the current AP or not associated yet. */
2350                 return;
2351         }
2352
2353         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2354                 /* Too short SA Query request frame */
2355                 return;
2356         }
2357
2358         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2359         if (skb == NULL)
2360                 return;
2361
2362         skb_reserve(skb, local->hw.extra_tx_headroom);
2363         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2364         memset(resp, 0, 24);
2365         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2366         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2367         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2368         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2369                                           IEEE80211_STYPE_ACTION);
2370         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2371         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2372         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2373         memcpy(resp->u.action.u.sa_query.trans_id,
2374                mgmt->u.action.u.sa_query.trans_id,
2375                WLAN_SA_QUERY_TR_ID_LEN);
2376
2377         ieee80211_tx_skb(sdata, skb);
2378 }
2379
2380 static ieee80211_rx_result debug_noinline
2381 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2382 {
2383         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2384         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2385
2386         /*
2387          * From here on, look only at management frames.
2388          * Data and control frames are already handled,
2389          * and unknown (reserved) frames are useless.
2390          */
2391         if (rx->skb->len < 24)
2392                 return RX_DROP_MONITOR;
2393
2394         if (!ieee80211_is_mgmt(mgmt->frame_control))
2395                 return RX_DROP_MONITOR;
2396
2397         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2398             ieee80211_is_beacon(mgmt->frame_control) &&
2399             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2400                 int sig = 0;
2401
2402                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2403                         sig = status->signal;
2404
2405                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2406                                             rx->skb->data, rx->skb->len,
2407                                             status->freq, sig);
2408                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2409         }
2410
2411         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2412                 return RX_DROP_MONITOR;
2413
2414         if (ieee80211_drop_unencrypted_mgmt(rx))
2415                 return RX_DROP_UNUSABLE;
2416
2417         return RX_CONTINUE;
2418 }
2419
2420 static ieee80211_rx_result debug_noinline
2421 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2422 {
2423         struct ieee80211_local *local = rx->local;
2424         struct ieee80211_sub_if_data *sdata = rx->sdata;
2425         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2426         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2427         int len = rx->skb->len;
2428
2429         if (!ieee80211_is_action(mgmt->frame_control))
2430                 return RX_CONTINUE;
2431
2432         /* drop too small frames */
2433         if (len < IEEE80211_MIN_ACTION_SIZE)
2434                 return RX_DROP_UNUSABLE;
2435
2436         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2437             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2438             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2439                 return RX_DROP_UNUSABLE;
2440
2441         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2442                 return RX_DROP_UNUSABLE;
2443
2444         switch (mgmt->u.action.category) {
2445         case WLAN_CATEGORY_HT:
2446                 /* reject HT action frames from stations not supporting HT */
2447                 if (!rx->sta->sta.ht_cap.ht_supported)
2448                         goto invalid;
2449
2450                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2451                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2452                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2453                     sdata->vif.type != NL80211_IFTYPE_AP &&
2454                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2455                         break;
2456
2457                 /* verify action & smps_control/chanwidth are present */
2458                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2459                         goto invalid;
2460
2461                 switch (mgmt->u.action.u.ht_smps.action) {
2462                 case WLAN_HT_ACTION_SMPS: {
2463                         struct ieee80211_supported_band *sband;
2464                         enum ieee80211_smps_mode smps_mode;
2465
2466                         /* convert to HT capability */
2467                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2468                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2469                                 smps_mode = IEEE80211_SMPS_OFF;
2470                                 break;
2471                         case WLAN_HT_SMPS_CONTROL_STATIC:
2472                                 smps_mode = IEEE80211_SMPS_STATIC;
2473                                 break;
2474                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2475                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2476                                 break;
2477                         default:
2478                                 goto invalid;
2479                         }
2480
2481                         /* if no change do nothing */
2482                         if (rx->sta->sta.smps_mode == smps_mode)
2483                                 goto handled;
2484                         rx->sta->sta.smps_mode = smps_mode;
2485
2486                         sband = rx->local->hw.wiphy->bands[status->band];
2487
2488                         rate_control_rate_update(local, sband, rx->sta,
2489                                                  IEEE80211_RC_SMPS_CHANGED);
2490                         goto handled;
2491                 }
2492                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2493                         struct ieee80211_supported_band *sband;
2494                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2495                         enum ieee80211_sta_rx_bandwidth new_bw;
2496
2497                         /* If it doesn't support 40 MHz it can't change ... */
2498                         if (!(rx->sta->sta.ht_cap.cap &
2499                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2500                                 goto handled;
2501
2502                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2503                                 new_bw = IEEE80211_STA_RX_BW_20;
2504                         else
2505                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2506
2507                         if (rx->sta->sta.bandwidth == new_bw)
2508                                 goto handled;
2509
2510                         sband = rx->local->hw.wiphy->bands[status->band];
2511
2512                         rate_control_rate_update(local, sband, rx->sta,
2513                                                  IEEE80211_RC_BW_CHANGED);
2514                         goto handled;
2515                 }
2516                 default:
2517                         goto invalid;
2518                 }
2519
2520                 break;
2521         case WLAN_CATEGORY_PUBLIC:
2522                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2523                         goto invalid;
2524                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2525                         break;
2526                 if (!rx->sta)
2527                         break;
2528                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2529                         break;
2530                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2531                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2532                         break;
2533                 if (len < offsetof(struct ieee80211_mgmt,
2534                                    u.action.u.ext_chan_switch.variable))
2535                         goto invalid;
2536                 goto queue;
2537         case WLAN_CATEGORY_VHT:
2538                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2539                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2540                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2541                     sdata->vif.type != NL80211_IFTYPE_AP &&
2542                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2543                         break;
2544
2545                 /* verify action code is present */
2546                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2547                         goto invalid;
2548
2549                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2550                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2551                         u8 opmode;
2552
2553                         /* verify opmode is present */
2554                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2555                                 goto invalid;
2556
2557                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2558
2559                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2560                                                     opmode, status->band,
2561                                                     false);
2562                         goto handled;
2563                 }
2564                 default:
2565                         break;
2566                 }
2567                 break;
2568         case WLAN_CATEGORY_BACK:
2569                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2570                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2571                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2572                     sdata->vif.type != NL80211_IFTYPE_AP &&
2573                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2574                         break;
2575
2576                 /* verify action_code is present */
2577                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2578                         break;
2579
2580                 switch (mgmt->u.action.u.addba_req.action_code) {
2581                 case WLAN_ACTION_ADDBA_REQ:
2582                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2583                                    sizeof(mgmt->u.action.u.addba_req)))
2584                                 goto invalid;
2585                         break;
2586                 case WLAN_ACTION_ADDBA_RESP:
2587                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2588                                    sizeof(mgmt->u.action.u.addba_resp)))
2589                                 goto invalid;
2590                         break;
2591                 case WLAN_ACTION_DELBA:
2592                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2593                                    sizeof(mgmt->u.action.u.delba)))
2594                                 goto invalid;
2595                         break;
2596                 default:
2597                         goto invalid;
2598                 }
2599
2600                 goto queue;
2601         case WLAN_CATEGORY_SPECTRUM_MGMT:
2602                 /* verify action_code is present */
2603                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2604                         break;
2605
2606                 switch (mgmt->u.action.u.measurement.action_code) {
2607                 case WLAN_ACTION_SPCT_MSR_REQ:
2608                         if (status->band != IEEE80211_BAND_5GHZ)
2609                                 break;
2610
2611                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2612                                    sizeof(mgmt->u.action.u.measurement)))
2613                                 break;
2614
2615                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2616                                 break;
2617
2618                         ieee80211_process_measurement_req(sdata, mgmt, len);
2619                         goto handled;
2620                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2621                         u8 *bssid;
2622                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2623                                    sizeof(mgmt->u.action.u.chan_switch)))
2624                                 break;
2625
2626                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2627                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2628                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2629                                 break;
2630
2631                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2632                                 bssid = sdata->u.mgd.bssid;
2633                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2634                                 bssid = sdata->u.ibss.bssid;
2635                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2636                                 bssid = mgmt->sa;
2637                         else
2638                                 break;
2639
2640                         if (!ether_addr_equal(mgmt->bssid, bssid))
2641                                 break;
2642
2643                         goto queue;
2644                         }
2645                 }
2646                 break;
2647         case WLAN_CATEGORY_SA_QUERY:
2648                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2649                            sizeof(mgmt->u.action.u.sa_query)))
2650                         break;
2651
2652                 switch (mgmt->u.action.u.sa_query.action) {
2653                 case WLAN_ACTION_SA_QUERY_REQUEST:
2654                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2655                                 break;
2656                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2657                         goto handled;
2658                 }
2659                 break;
2660         case WLAN_CATEGORY_SELF_PROTECTED:
2661                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2662                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2663                         break;
2664
2665                 switch (mgmt->u.action.u.self_prot.action_code) {
2666                 case WLAN_SP_MESH_PEERING_OPEN:
2667                 case WLAN_SP_MESH_PEERING_CLOSE:
2668                 case WLAN_SP_MESH_PEERING_CONFIRM:
2669                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2670                                 goto invalid;
2671                         if (sdata->u.mesh.user_mpm)
2672                                 /* userspace handles this frame */
2673                                 break;
2674                         goto queue;
2675                 case WLAN_SP_MGK_INFORM:
2676                 case WLAN_SP_MGK_ACK:
2677                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2678                                 goto invalid;
2679                         break;
2680                 }
2681                 break;
2682         case WLAN_CATEGORY_MESH_ACTION:
2683                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2684                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2685                         break;
2686
2687                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2688                         break;
2689                 if (mesh_action_is_path_sel(mgmt) &&
2690                     !mesh_path_sel_is_hwmp(sdata))
2691                         break;
2692                 goto queue;
2693         }
2694
2695         return RX_CONTINUE;
2696
2697  invalid:
2698         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2699         /* will return in the next handlers */
2700         return RX_CONTINUE;
2701
2702  handled:
2703         if (rx->sta)
2704                 rx->sta->rx_packets++;
2705         dev_kfree_skb(rx->skb);
2706         return RX_QUEUED;
2707
2708  queue:
2709         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2710         skb_queue_tail(&sdata->skb_queue, rx->skb);
2711         ieee80211_queue_work(&local->hw, &sdata->work);
2712         if (rx->sta)
2713                 rx->sta->rx_packets++;
2714         return RX_QUEUED;
2715 }
2716
2717 static ieee80211_rx_result debug_noinline
2718 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2719 {
2720         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2721         int sig = 0;
2722
2723         /* skip known-bad action frames and return them in the next handler */
2724         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2725                 return RX_CONTINUE;
2726
2727         /*
2728          * Getting here means the kernel doesn't know how to handle
2729          * it, but maybe userspace does ... include returned frames
2730          * so userspace can register for those to know whether ones
2731          * it transmitted were processed or returned.
2732          */
2733
2734         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2735                 sig = status->signal;
2736
2737         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2738                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2739                 if (rx->sta)
2740                         rx->sta->rx_packets++;
2741                 dev_kfree_skb(rx->skb);
2742                 return RX_QUEUED;
2743         }
2744
2745         return RX_CONTINUE;
2746 }
2747
2748 static ieee80211_rx_result debug_noinline
2749 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2750 {
2751         struct ieee80211_local *local = rx->local;
2752         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2753         struct sk_buff *nskb;
2754         struct ieee80211_sub_if_data *sdata = rx->sdata;
2755         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2756
2757         if (!ieee80211_is_action(mgmt->frame_control))
2758                 return RX_CONTINUE;
2759
2760         /*
2761          * For AP mode, hostapd is responsible for handling any action
2762          * frames that we didn't handle, including returning unknown
2763          * ones. For all other modes we will return them to the sender,
2764          * setting the 0x80 bit in the action category, as required by
2765          * 802.11-2012 9.24.4.
2766          * Newer versions of hostapd shall also use the management frame
2767          * registration mechanisms, but older ones still use cooked
2768          * monitor interfaces so push all frames there.
2769          */
2770         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2771             (sdata->vif.type == NL80211_IFTYPE_AP ||
2772              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2773                 return RX_DROP_MONITOR;
2774
2775         if (is_multicast_ether_addr(mgmt->da))
2776                 return RX_DROP_MONITOR;
2777
2778         /* do not return rejected action frames */
2779         if (mgmt->u.action.category & 0x80)
2780                 return RX_DROP_UNUSABLE;
2781
2782         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2783                                GFP_ATOMIC);
2784         if (nskb) {
2785                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2786
2787                 nmgmt->u.action.category |= 0x80;
2788                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2789                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2790
2791                 memset(nskb->cb, 0, sizeof(nskb->cb));
2792
2793                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2794                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2795
2796                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2797                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2798                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2799                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2800                                 info->hw_queue =
2801                                         local->hw.offchannel_tx_hw_queue;
2802                 }
2803
2804                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2805                                             status->band);
2806         }
2807         dev_kfree_skb(rx->skb);
2808         return RX_QUEUED;
2809 }
2810
2811 static ieee80211_rx_result debug_noinline
2812 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2813 {
2814         struct ieee80211_sub_if_data *sdata = rx->sdata;
2815         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2816         __le16 stype;
2817
2818         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2819
2820         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2821             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2822             sdata->vif.type != NL80211_IFTYPE_STATION)
2823                 return RX_DROP_MONITOR;
2824
2825         switch (stype) {
2826         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2827         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2828         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2829                 /* process for all: mesh, mlme, ibss */
2830                 break;
2831         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2832         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2833         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2834         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2835                 if (is_multicast_ether_addr(mgmt->da) &&
2836                     !is_broadcast_ether_addr(mgmt->da))
2837                         return RX_DROP_MONITOR;
2838
2839                 /* process only for station */
2840                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2841                         return RX_DROP_MONITOR;
2842                 break;
2843         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2844                 /* process only for ibss and mesh */
2845                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2846                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2847                         return RX_DROP_MONITOR;
2848                 break;
2849         default:
2850                 return RX_DROP_MONITOR;
2851         }
2852
2853         /* queue up frame and kick off work to process it */
2854         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2855         skb_queue_tail(&sdata->skb_queue, rx->skb);
2856         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2857         if (rx->sta)
2858                 rx->sta->rx_packets++;
2859
2860         return RX_QUEUED;
2861 }
2862
2863 /* TODO: use IEEE80211_RX_FRAGMENTED */
2864 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2865                                         struct ieee80211_rate *rate)
2866 {
2867         struct ieee80211_sub_if_data *sdata;
2868         struct ieee80211_local *local = rx->local;
2869         struct sk_buff *skb = rx->skb, *skb2;
2870         struct net_device *prev_dev = NULL;
2871         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2872         int needed_headroom;
2873
2874         /*
2875          * If cooked monitor has been processed already, then
2876          * don't do it again. If not, set the flag.
2877          */
2878         if (rx->flags & IEEE80211_RX_CMNTR)
2879                 goto out_free_skb;
2880         rx->flags |= IEEE80211_RX_CMNTR;
2881
2882         /* If there are no cooked monitor interfaces, just free the SKB */
2883         if (!local->cooked_mntrs)
2884                 goto out_free_skb;
2885
2886         /* room for the radiotap header based on driver features */
2887         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2888
2889         if (skb_headroom(skb) < needed_headroom &&
2890             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2891                 goto out_free_skb;
2892
2893         /* prepend radiotap information */
2894         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2895                                          false);
2896
2897         skb_set_mac_header(skb, 0);
2898         skb->ip_summed = CHECKSUM_UNNECESSARY;
2899         skb->pkt_type = PACKET_OTHERHOST;
2900         skb->protocol = htons(ETH_P_802_2);
2901
2902         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2903                 if (!ieee80211_sdata_running(sdata))
2904                         continue;
2905
2906                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2907                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2908                         continue;
2909
2910                 if (prev_dev) {
2911                         skb2 = skb_clone(skb, GFP_ATOMIC);
2912                         if (skb2) {
2913                                 skb2->dev = prev_dev;
2914                                 netif_receive_skb(skb2);
2915                         }
2916                 }
2917
2918                 prev_dev = sdata->dev;
2919                 sdata->dev->stats.rx_packets++;
2920                 sdata->dev->stats.rx_bytes += skb->len;
2921         }
2922
2923         if (prev_dev) {
2924                 skb->dev = prev_dev;
2925                 netif_receive_skb(skb);
2926                 return;
2927         }
2928
2929  out_free_skb:
2930         dev_kfree_skb(skb);
2931 }
2932
2933 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2934                                          ieee80211_rx_result res)
2935 {
2936         switch (res) {
2937         case RX_DROP_MONITOR:
2938                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2939                 if (rx->sta)
2940                         rx->sta->rx_dropped++;
2941                 /* fall through */
2942         case RX_CONTINUE: {
2943                 struct ieee80211_rate *rate = NULL;
2944                 struct ieee80211_supported_band *sband;
2945                 struct ieee80211_rx_status *status;
2946
2947                 status = IEEE80211_SKB_RXCB((rx->skb));
2948
2949                 sband = rx->local->hw.wiphy->bands[status->band];
2950                 if (!(status->flag & RX_FLAG_HT) &&
2951                     !(status->flag & RX_FLAG_VHT))
2952                         rate = &sband->bitrates[status->rate_idx];
2953
2954                 ieee80211_rx_cooked_monitor(rx, rate);
2955                 break;
2956                 }
2957         case RX_DROP_UNUSABLE:
2958                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2959                 if (rx->sta)
2960                         rx->sta->rx_dropped++;
2961                 dev_kfree_skb(rx->skb);
2962                 break;
2963         case RX_QUEUED:
2964                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2965                 break;
2966         }
2967 }
2968
2969 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2970                                   struct sk_buff_head *frames)
2971 {
2972         ieee80211_rx_result res = RX_DROP_MONITOR;
2973         struct sk_buff *skb;
2974
2975 #define CALL_RXH(rxh)                   \
2976         do {                            \
2977                 res = rxh(rx);          \
2978                 if (res != RX_CONTINUE) \
2979                         goto rxh_next;  \
2980         } while (0);
2981
2982         spin_lock_bh(&rx->local->rx_path_lock);
2983
2984         while ((skb = __skb_dequeue(frames))) {
2985                 /*
2986                  * all the other fields are valid across frames
2987                  * that belong to an aMPDU since they are on the
2988                  * same TID from the same station
2989                  */
2990                 rx->skb = skb;
2991
2992                 CALL_RXH(ieee80211_rx_h_check_more_data)
2993                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2994                 CALL_RXH(ieee80211_rx_h_sta_process)
2995                 CALL_RXH(ieee80211_rx_h_decrypt)
2996                 CALL_RXH(ieee80211_rx_h_defragment)
2997                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2998                 /* must be after MMIC verify so header is counted in MPDU mic */
2999 #ifdef CONFIG_MAC80211_MESH
3000                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3001                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3002 #endif
3003                 CALL_RXH(ieee80211_rx_h_amsdu)
3004                 CALL_RXH(ieee80211_rx_h_data)
3005
3006                 /* special treatment -- needs the queue */
3007                 res = ieee80211_rx_h_ctrl(rx, frames);
3008                 if (res != RX_CONTINUE)
3009                         goto rxh_next;
3010
3011                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3012                 CALL_RXH(ieee80211_rx_h_action)
3013                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3014                 CALL_RXH(ieee80211_rx_h_action_return)
3015                 CALL_RXH(ieee80211_rx_h_mgmt)
3016
3017  rxh_next:
3018                 ieee80211_rx_handlers_result(rx, res);
3019
3020 #undef CALL_RXH
3021         }
3022
3023         spin_unlock_bh(&rx->local->rx_path_lock);
3024 }
3025
3026 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3027 {
3028         struct sk_buff_head reorder_release;
3029         ieee80211_rx_result res = RX_DROP_MONITOR;
3030
3031         __skb_queue_head_init(&reorder_release);
3032
3033 #define CALL_RXH(rxh)                   \
3034         do {                            \
3035                 res = rxh(rx);          \
3036                 if (res != RX_CONTINUE) \
3037                         goto rxh_next;  \
3038         } while (0);
3039
3040         CALL_RXH(ieee80211_rx_h_check)
3041
3042         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3043
3044         ieee80211_rx_handlers(rx, &reorder_release);
3045         return;
3046
3047  rxh_next:
3048         ieee80211_rx_handlers_result(rx, res);
3049
3050 #undef CALL_RXH
3051 }
3052
3053 /*
3054  * This function makes calls into the RX path, therefore
3055  * it has to be invoked under RCU read lock.
3056  */
3057 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3058 {
3059         struct sk_buff_head frames;
3060         struct ieee80211_rx_data rx = {
3061                 .sta = sta,
3062                 .sdata = sta->sdata,
3063                 .local = sta->local,
3064                 /* This is OK -- must be QoS data frame */
3065                 .security_idx = tid,
3066                 .seqno_idx = tid,
3067                 .flags = 0,
3068         };
3069         struct tid_ampdu_rx *tid_agg_rx;
3070
3071         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3072         if (!tid_agg_rx)
3073                 return;
3074
3075         __skb_queue_head_init(&frames);
3076
3077         spin_lock(&tid_agg_rx->reorder_lock);
3078         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3079         spin_unlock(&tid_agg_rx->reorder_lock);
3080
3081         ieee80211_rx_handlers(&rx, &frames);
3082 }
3083
3084 /* main receive path */
3085
3086 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3087                                  struct ieee80211_hdr *hdr)
3088 {
3089         struct ieee80211_sub_if_data *sdata = rx->sdata;
3090         struct sk_buff *skb = rx->skb;
3091         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3092         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3093         int multicast = is_multicast_ether_addr(hdr->addr1);
3094
3095         switch (sdata->vif.type) {
3096         case NL80211_IFTYPE_STATION:
3097                 if (!bssid && !sdata->u.mgd.use_4addr)
3098                         return false;
3099                 if (!multicast &&
3100                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3101                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3102                             sdata->u.mgd.use_4addr)
3103                                 return false;
3104                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3105                 }
3106                 break;
3107         case NL80211_IFTYPE_ADHOC:
3108                 if (!bssid)
3109                         return false;
3110                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3111                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3112                         return false;
3113                 if (ieee80211_is_beacon(hdr->frame_control)) {
3114                         return true;
3115                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3116                         return false;
3117                 } else if (!multicast &&
3118                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3119                         if (!(sdata->dev->flags & IFF_PROMISC))
3120                                 return false;
3121                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3122                 } else if (!rx->sta) {
3123                         int rate_idx;
3124                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3125                                 rate_idx = 0; /* TODO: HT/VHT rates */
3126                         else
3127                                 rate_idx = status->rate_idx;
3128                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3129                                                  BIT(rate_idx));
3130                 }
3131                 break;
3132         case NL80211_IFTYPE_MESH_POINT:
3133                 if (!multicast &&
3134                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3135                         if (!(sdata->dev->flags & IFF_PROMISC))
3136                                 return false;
3137
3138                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3139                 }
3140                 break;
3141         case NL80211_IFTYPE_AP_VLAN:
3142         case NL80211_IFTYPE_AP:
3143                 if (!bssid) {
3144                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3145                                 return false;
3146                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3147                         /*
3148                          * Accept public action frames even when the
3149                          * BSSID doesn't match, this is used for P2P
3150                          * and location updates. Note that mac80211
3151                          * itself never looks at these frames.
3152                          */
3153                         if (!multicast &&
3154                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3155                                 return false;
3156                         if (ieee80211_is_public_action(hdr, skb->len))
3157                                 return true;
3158                         if (!ieee80211_is_beacon(hdr->frame_control))
3159                                 return false;
3160                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3161                 }
3162                 break;
3163         case NL80211_IFTYPE_WDS:
3164                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3165                         return false;
3166                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3167                         return false;
3168                 break;
3169         case NL80211_IFTYPE_P2P_DEVICE:
3170                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3171                     !ieee80211_is_probe_req(hdr->frame_control) &&
3172                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3173                     !ieee80211_is_beacon(hdr->frame_control))
3174                         return false;
3175                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3176                     !multicast)
3177                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3178                 break;
3179         default:
3180                 /* should never get here */
3181                 WARN_ON_ONCE(1);
3182                 break;
3183         }
3184
3185         return true;
3186 }
3187
3188 /*
3189  * This function returns whether or not the SKB
3190  * was destined for RX processing or not, which,
3191  * if consume is true, is equivalent to whether
3192  * or not the skb was consumed.
3193  */
3194 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3195                                             struct sk_buff *skb, bool consume)
3196 {
3197         struct ieee80211_local *local = rx->local;
3198         struct ieee80211_sub_if_data *sdata = rx->sdata;
3199         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3200         struct ieee80211_hdr *hdr = (void *)skb->data;
3201
3202         rx->skb = skb;
3203         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3204
3205         if (!prepare_for_handlers(rx, hdr))
3206                 return false;
3207
3208         if (!consume) {
3209                 skb = skb_copy(skb, GFP_ATOMIC);
3210                 if (!skb) {
3211                         if (net_ratelimit())
3212                                 wiphy_debug(local->hw.wiphy,
3213                                         "failed to copy skb for %s\n",
3214                                         sdata->name);
3215                         return true;
3216                 }
3217
3218                 rx->skb = skb;
3219         }
3220
3221         ieee80211_invoke_rx_handlers(rx);
3222         return true;
3223 }
3224
3225 /*
3226  * This is the actual Rx frames handler. as it blongs to Rx path it must
3227  * be called with rcu_read_lock protection.
3228  */
3229 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3230                                          struct sk_buff *skb)
3231 {
3232         struct ieee80211_local *local = hw_to_local(hw);
3233         struct ieee80211_sub_if_data *sdata;
3234         struct ieee80211_hdr *hdr;
3235         __le16 fc;
3236         struct ieee80211_rx_data rx;
3237         struct ieee80211_sub_if_data *prev;
3238         struct sta_info *sta, *tmp, *prev_sta;
3239         int err = 0;
3240
3241         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3242         memset(&rx, 0, sizeof(rx));
3243         rx.skb = skb;
3244         rx.local = local;
3245
3246         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3247                 local->dot11ReceivedFragmentCount++;
3248
3249         if (ieee80211_is_mgmt(fc)) {
3250                 /* drop frame if too short for header */
3251                 if (skb->len < ieee80211_hdrlen(fc))
3252                         err = -ENOBUFS;
3253                 else
3254                         err = skb_linearize(skb);
3255         } else {
3256                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3257         }
3258
3259         if (err) {
3260                 dev_kfree_skb(skb);
3261                 return;
3262         }
3263
3264         hdr = (struct ieee80211_hdr *)skb->data;
3265         ieee80211_parse_qos(&rx);
3266         ieee80211_verify_alignment(&rx);
3267
3268         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3269                      ieee80211_is_beacon(hdr->frame_control)))
3270                 ieee80211_scan_rx(local, skb);
3271
3272         if (ieee80211_is_data(fc)) {
3273                 prev_sta = NULL;
3274
3275                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3276                         if (!prev_sta) {
3277                                 prev_sta = sta;
3278                                 continue;
3279                         }
3280
3281                         rx.sta = prev_sta;
3282                         rx.sdata = prev_sta->sdata;
3283                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3284
3285                         prev_sta = sta;
3286                 }
3287
3288                 if (prev_sta) {
3289                         rx.sta = prev_sta;
3290                         rx.sdata = prev_sta->sdata;
3291
3292                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3293                                 return;
3294                         goto out;
3295                 }
3296         }
3297
3298         prev = NULL;
3299
3300         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3301                 if (!ieee80211_sdata_running(sdata))
3302                         continue;
3303
3304                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3305                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3306                         continue;
3307
3308                 /*
3309                  * frame is destined for this interface, but if it's
3310                  * not also for the previous one we handle that after
3311                  * the loop to avoid copying the SKB once too much
3312                  */
3313
3314                 if (!prev) {
3315                         prev = sdata;
3316                         continue;
3317                 }
3318
3319                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3320                 rx.sdata = prev;
3321                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3322
3323                 prev = sdata;
3324         }
3325
3326         if (prev) {
3327                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3328                 rx.sdata = prev;
3329
3330                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3331                         return;
3332         }
3333
3334  out:
3335         dev_kfree_skb(skb);
3336 }
3337
3338 /*
3339  * This is the receive path handler. It is called by a low level driver when an
3340  * 802.11 MPDU is received from the hardware.
3341  */
3342 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3343 {
3344         struct ieee80211_local *local = hw_to_local(hw);
3345         struct ieee80211_rate *rate = NULL;
3346         struct ieee80211_supported_band *sband;
3347         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3348
3349         WARN_ON_ONCE(softirq_count() == 0);
3350
3351         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3352                 goto drop;
3353
3354         sband = local->hw.wiphy->bands[status->band];
3355         if (WARN_ON(!sband))
3356                 goto drop;
3357
3358         /*
3359          * If we're suspending, it is possible although not too likely
3360          * that we'd be receiving frames after having already partially
3361          * quiesced the stack. We can't process such frames then since
3362          * that might, for example, cause stations to be added or other
3363          * driver callbacks be invoked.
3364          */
3365         if (unlikely(local->quiescing || local->suspended))
3366                 goto drop;
3367
3368         /* We might be during a HW reconfig, prevent Rx for the same reason */
3369         if (unlikely(local->in_reconfig))
3370                 goto drop;
3371
3372         /*
3373          * The same happens when we're not even started,
3374          * but that's worth a warning.
3375          */
3376         if (WARN_ON(!local->started))
3377                 goto drop;
3378
3379         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3380                 /*
3381                  * Validate the rate, unless a PLCP error means that
3382                  * we probably can't have a valid rate here anyway.
3383                  */
3384
3385                 if (status->flag & RX_FLAG_HT) {
3386                         /*
3387                          * rate_idx is MCS index, which can be [0-76]
3388                          * as documented on:
3389                          *
3390                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3391                          *
3392                          * Anything else would be some sort of driver or
3393                          * hardware error. The driver should catch hardware
3394                          * errors.
3395                          */
3396                         if (WARN(status->rate_idx > 76,
3397                                  "Rate marked as an HT rate but passed "
3398                                  "status->rate_idx is not "
3399                                  "an MCS index [0-76]: %d (0x%02x)\n",
3400                                  status->rate_idx,
3401                                  status->rate_idx))
3402                                 goto drop;
3403                 } else if (status->flag & RX_FLAG_VHT) {
3404                         if (WARN_ONCE(status->rate_idx > 9 ||
3405                                       !status->vht_nss ||
3406                                       status->vht_nss > 8,
3407                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3408                                       status->rate_idx, status->vht_nss))
3409                                 goto drop;
3410                 } else {
3411                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3412                                 goto drop;
3413                         rate = &sband->bitrates[status->rate_idx];
3414                 }
3415         }
3416
3417         status->rx_flags = 0;
3418
3419         /*
3420          * key references and virtual interfaces are protected using RCU
3421          * and this requires that we are in a read-side RCU section during
3422          * receive processing
3423          */
3424         rcu_read_lock();
3425
3426         /*
3427          * Frames with failed FCS/PLCP checksum are not returned,
3428          * all other frames are returned without radiotap header
3429          * if it was previously present.
3430          * Also, frames with less than 16 bytes are dropped.
3431          */
3432         skb = ieee80211_rx_monitor(local, skb, rate);
3433         if (!skb) {
3434                 rcu_read_unlock();
3435                 return;
3436         }
3437
3438         ieee80211_tpt_led_trig_rx(local,
3439                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3440                         skb->len);
3441         __ieee80211_rx_handle_packet(hw, skb);
3442
3443         rcu_read_unlock();
3444
3445         return;
3446  drop:
3447         kfree_skb(skb);
3448 }
3449 EXPORT_SYMBOL(ieee80211_rx);
3450
3451 /* This is a version of the rx handler that can be called from hard irq
3452  * context. Post the skb on the queue and schedule the tasklet */
3453 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3454 {
3455         struct ieee80211_local *local = hw_to_local(hw);
3456
3457         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3458
3459         skb->pkt_type = IEEE80211_RX_MSG;
3460         skb_queue_tail(&local->skb_queue, skb);
3461         tasklet_schedule(&local->tasklet);
3462 }
3463 EXPORT_SYMBOL(ieee80211_rx_irqsafe);