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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/jiffies.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/export.h>
  23 #include <linux/bitops.h>
  24 #include <net/mac80211.h>
  25 #include <net/ieee80211_radiotap.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "led.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "rate.h"
  37
  38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  39 {
  40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  41
  42         u64_stats_update_begin(&tstats->syncp);
  43         tstats->rx_packets++;
  44         tstats->rx_bytes += len;
  45         u64_stats_update_end(&tstats->syncp);
  46 }
  47
  48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                                enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53         if (ieee80211_is_data(fc)) {
  54                 if (len < 24) /* drop incorrect hdr len (data) */
  55                         return NULL;
  56
  57                 if (ieee80211_has_a4(fc))
  58                         return NULL;
  59                 if (ieee80211_has_tods(fc))
  60                         return hdr->addr1;
  61                 if (ieee80211_has_fromds(fc))
  62                         return hdr->addr2;
  63
  64                 return hdr->addr3;
  65         }
  66
  67         if (ieee80211_is_mgmt(fc)) {
  68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  69                         return NULL;
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_ctl(fc)) {
  74                 if (ieee80211_is_pspoll(fc))
  75                         return hdr->addr1;
  76
  77                 if (ieee80211_is_back_req(fc)) {
  78                         switch (type) {
  79                         case NL80211_IFTYPE_STATION:
  80                                 return hdr->addr2;
  81                         case NL80211_IFTYPE_AP:
  82                         case NL80211_IFTYPE_AP_VLAN:
  83                                 return hdr->addr1;
  84                         default:
  85                                 break; /* fall through to the return */
  86                         }
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94  * monitor mode reception
  95  *
  96  * This function cleans up the SKB, i.e. it removes all the stuff
  97  * only useful for monitoring.
  98  */
  99 static void remove_monitor_info(struct sk_buff *skb,
 100                                 unsigned int present_fcs_len,
 101                                 unsigned int rtap_space)
 102 {
 103         if (present_fcs_len)
 104                 __pskb_trim(skb, skb->len - present_fcs_len);
 105         __pskb_pull(skb, rtap_space);
 106 }
 107
 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 109                                      unsigned int rtap_space)
 110 {
 111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 112         struct ieee80211_hdr *hdr;
 113
 114         hdr = (void *)(skb->data + rtap_space);
 115
 116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 117                             RX_FLAG_FAILED_PLCP_CRC |
 118                             RX_FLAG_ONLY_MONITOR))
 119                 return true;
 120
 121         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 122                 return true;
 123
 124         if (ieee80211_is_ctl(hdr->frame_control) &&
 125             !ieee80211_is_pspoll(hdr->frame_control) &&
 126             !ieee80211_is_back_req(hdr->frame_control))
 127                 return true;
 128
 129         return false;
 130 }
 131
 132 static int
 133 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 134                              struct ieee80211_rx_status *status,
 135                              struct sk_buff *skb)
 136 {
 137         int len;
 138
 139         /* always present fields */
 140         len = sizeof(struct ieee80211_radiotap_header) + 8;
 141
 142         /* allocate extra bitmaps */
 143         if (status->chains)
 144                 len += 4 * hweight8(status->chains);
 145
 146         if (ieee80211_have_rx_timestamp(status)) {
 147                 len = ALIGN(len, 8);
 148                 len += 8;
 149         }
 150         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 151                 len += 1;
 152
 153         /* antenna field, if we don't have per-chain info */
 154         if (!status->chains)
 155                 len += 1;
 156
 157         /* padding for RX_FLAGS if necessary */
 158         len = ALIGN(len, 2);
 159
 160         if (status->encoding == RX_ENC_HT) /* HT info */
 161                 len += 3;
 162
 163         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 164                 len = ALIGN(len, 4);
 165                 len += 8;
 166         }
 167
 168         if (status->encoding == RX_ENC_VHT) {
 169                 len = ALIGN(len, 2);
 170                 len += 12;
 171         }
 172
 173         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 174                 len = ALIGN(len, 8);
 175                 len += 12;
 176         }
 177
 178         if (status->encoding == RX_ENC_HE &&
 179             status->flag & RX_FLAG_RADIOTAP_HE) {
 180                 len = ALIGN(len, 2);
 181                 len += 12;
 182                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 183         }
 184
 185         if (status->encoding == RX_ENC_HE &&
 186             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 187                 len = ALIGN(len, 2);
 188                 len += 12;
 189                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 190         }
 191
 192         if (status->chains) {
 193                 /* antenna and antenna signal fields */
 194                 len += 2 * hweight8(status->chains);
 195         }
 196
 197         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 198                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 199
 200                 /* vendor presence bitmap */
 201                 len += 4;
 202                 /* alignment for fixed 6-byte vendor data header */
 203                 len = ALIGN(len, 2);
 204                 /* vendor data header */
 205                 len += 6;
 206                 if (WARN_ON(rtap->align == 0))
 207                         rtap->align = 1;
 208                 len = ALIGN(len, rtap->align);
 209                 len += rtap->len + rtap->pad;
 210         }
 211
 212         return len;
 213 }
 214
 215 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 216                                          struct sk_buff *skb,
 217                                          int rtap_space)
 218 {
 219         struct {
 220                 struct ieee80211_hdr_3addr hdr;
 221                 u8 category;
 222                 u8 action_code;
 223         } __packed action;
 224
 225         if (!sdata)
 226                 return;
 227
 228         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 229
 230         if (skb->len < rtap_space + sizeof(action) +
 231                        VHT_MUMIMO_GROUPS_DATA_LEN)
 232                 return;
 233
 234         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 235                 return;
 236
 237         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 238
 239         if (!ieee80211_is_action(action.hdr.frame_control))
 240                 return;
 241
 242         if (action.category != WLAN_CATEGORY_VHT)
 243                 return;
 244
 245         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 246                 return;
 247
 248         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 249                 return;
 250
 251         skb = skb_copy(skb, GFP_ATOMIC);
 252         if (!skb)
 253                 return;
 254
 255         skb_queue_tail(&sdata->skb_queue, skb);
 256         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 257 }
 258
 259 /*
 260  * ieee80211_add_rx_radiotap_header - add radiotap header
 261  *
 262  * add a radiotap header containing all the fields which the hardware provided.
 263  */
 264 static void
 265 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 266                                  struct sk_buff *skb,
 267                                  struct ieee80211_rate *rate,
 268                                  int rtap_len, bool has_fcs)
 269 {
 270         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 271         struct ieee80211_radiotap_header *rthdr;
 272         unsigned char *pos;
 273         __le32 *it_present;
 274         u32 it_present_val;
 275         u16 rx_flags = 0;
 276         u16 channel_flags = 0;
 277         int mpdulen, chain;
 278         unsigned long chains = status->chains;
 279         struct ieee80211_vendor_radiotap rtap = {};
 280         struct ieee80211_radiotap_he he = {};
 281         struct ieee80211_radiotap_he_mu he_mu = {};
 282
 283         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 284                 he = *(struct ieee80211_radiotap_he *)skb->data;
 285                 skb_pull(skb, sizeof(he));
 286                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 287         }
 288
 289         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 290                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 291                 skb_pull(skb, sizeof(he_mu));
 292         }
 293
 294         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 295                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 296                 /* rtap.len and rtap.pad are undone immediately */
 297                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 298         }
 299
 300         mpdulen = skb->len;
 301         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 302                 mpdulen += FCS_LEN;
 303
 304         rthdr = skb_push(skb, rtap_len);
 305         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 306         it_present = &rthdr->it_present;
 307
 308         /* radiotap header, set always present flags */
 309         rthdr->it_len = cpu_to_le16(rtap_len);
 310         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 311                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 312                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 313
 314         if (!status->chains)
 315                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 316
 317         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 318                 it_present_val |=
 319                         BIT(IEEE80211_RADIOTAP_EXT) |
 320                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 321                 put_unaligned_le32(it_present_val, it_present);
 322                 it_present++;
 323                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 324                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 325         }
 326
 327         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 328                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 329                                   BIT(IEEE80211_RADIOTAP_EXT);
 330                 put_unaligned_le32(it_present_val, it_present);
 331                 it_present++;
 332                 it_present_val = rtap.present;
 333         }
 334
 335         put_unaligned_le32(it_present_val, it_present);
 336
 337         pos = (void *)(it_present + 1);
 338
 339         /* the order of the following fields is important */
 340
 341         /* IEEE80211_RADIOTAP_TSFT */
 342         if (ieee80211_have_rx_timestamp(status)) {
 343                 /* padding */
 344                 while ((pos - (u8 *)rthdr) & 7)
 345                         *pos++ = 0;
 346                 put_unaligned_le64(
 347                         ieee80211_calculate_rx_timestamp(local, status,
 348                                                          mpdulen, 0),
 349                         pos);
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 351                 pos += 8;
 352         }
 353
 354         /* IEEE80211_RADIOTAP_FLAGS */
 355         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 356                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 357         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 358                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 359         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 360                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 361         pos++;
 362
 363         /* IEEE80211_RADIOTAP_RATE */
 364         if (!rate || status->encoding != RX_ENC_LEGACY) {
 365                 /*
 366                  * Without rate information don't add it. If we have,
 367                  * MCS information is a separate field in radiotap,
 368                  * added below. The byte here is needed as padding
 369                  * for the channel though, so initialise it to 0.
 370                  */
 371                 *pos = 0;
 372         } else {
 373                 int shift = 0;
 374                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 375                 if (status->bw == RATE_INFO_BW_10)
 376                         shift = 1;
 377                 else if (status->bw == RATE_INFO_BW_5)
 378                         shift = 2;
 379                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 380         }
 381         pos++;
 382
 383         /* IEEE80211_RADIOTAP_CHANNEL */
 384         put_unaligned_le16(status->freq, pos);
 385         pos += 2;
 386         if (status->bw == RATE_INFO_BW_10)
 387                 channel_flags |= IEEE80211_CHAN_HALF;
 388         else if (status->bw == RATE_INFO_BW_5)
 389                 channel_flags |= IEEE80211_CHAN_QUARTER;
 390
 391         if (status->band == NL80211_BAND_5GHZ)
 392                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 393         else if (status->encoding != RX_ENC_LEGACY)
 394                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 395         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 396                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 397         else if (rate)
 398                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 399         else
 400                 channel_flags |= IEEE80211_CHAN_2GHZ;
 401         put_unaligned_le16(channel_flags, pos);
 402         pos += 2;
 403
 404         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 405         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 406             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 407                 *pos = status->signal;
 408                 rthdr->it_present |=
 409                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 410                 pos++;
 411         }
 412
 413         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 414
 415         if (!status->chains) {
 416                 /* IEEE80211_RADIOTAP_ANTENNA */
 417                 *pos = status->antenna;
 418                 pos++;
 419         }
 420
 421         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 422
 423         /* IEEE80211_RADIOTAP_RX_FLAGS */
 424         /* ensure 2 byte alignment for the 2 byte field as required */
 425         if ((pos - (u8 *)rthdr) & 1)
 426                 *pos++ = 0;
 427         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 428                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 429         put_unaligned_le16(rx_flags, pos);
 430         pos += 2;
 431
 432         if (status->encoding == RX_ENC_HT) {
 433                 unsigned int stbc;
 434
 435                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 436                 *pos++ = local->hw.radiotap_mcs_details;
 437                 *pos = 0;
 438                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 439                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 440                 if (status->bw == RATE_INFO_BW_40)
 441                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 442                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 443                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 444                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 445                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 446                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 447                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 448                 pos++;
 449                 *pos++ = status->rate_idx;
 450         }
 451
 452         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 453                 u16 flags = 0;
 454
 455                 /* ensure 4 byte alignment */
 456                 while ((pos - (u8 *)rthdr) & 3)
 457                         pos++;
 458                 rthdr->it_present |=
 459                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 460                 put_unaligned_le32(status->ampdu_reference, pos);
 461                 pos += 4;
 462                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 463                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 464                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 465                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 466                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 467                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 468                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 469                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 470                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 471                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 472                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 473                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 474                 put_unaligned_le16(flags, pos);
 475                 pos += 2;
 476                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 477                         *pos++ = status->ampdu_delimiter_crc;
 478                 else
 479                         *pos++ = 0;
 480                 *pos++ = 0;
 481         }
 482
 483         if (status->encoding == RX_ENC_VHT) {
 484                 u16 known = local->hw.radiotap_vht_details;
 485
 486                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 487                 put_unaligned_le16(known, pos);
 488                 pos += 2;
 489                 /* flags */
 490                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 491                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 492                 /* in VHT, STBC is binary */
 493                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 494                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 495                 if (status->enc_flags & RX_ENC_FLAG_BF)
 496                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 497                 pos++;
 498                 /* bandwidth */
 499                 switch (status->bw) {
 500                 case RATE_INFO_BW_80:
 501                         *pos++ = 4;
 502                         break;
 503                 case RATE_INFO_BW_160:
 504                         *pos++ = 11;
 505                         break;
 506                 case RATE_INFO_BW_40:
 507                         *pos++ = 1;
 508                         break;
 509                 default:
 510                         *pos++ = 0;
 511                 }
 512                 /* MCS/NSS */
 513                 *pos = (status->rate_idx << 4) | status->nss;
 514                 pos += 4;
 515                 /* coding field */
 516                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 517                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 518                 pos++;
 519                 /* group ID */
 520                 pos++;
 521                 /* partial_aid */
 522                 pos += 2;
 523         }
 524
 525         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 526                 u16 accuracy = 0;
 527                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 528
 529                 rthdr->it_present |=
 530                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 531
 532                 /* ensure 8 byte alignment */
 533                 while ((pos - (u8 *)rthdr) & 7)
 534                         pos++;
 535
 536                 put_unaligned_le64(status->device_timestamp, pos);
 537                 pos += sizeof(u64);
 538
 539                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 540                         accuracy = local->hw.radiotap_timestamp.accuracy;
 541                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 542                 }
 543                 put_unaligned_le16(accuracy, pos);
 544                 pos += sizeof(u16);
 545
 546                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 547                 *pos++ = flags;
 548         }
 549
 550         if (status->encoding == RX_ENC_HE &&
 551             status->flag & RX_FLAG_RADIOTAP_HE) {
 552 #define HE_PREP(f, val) cpu_to_le16(FIELD_PREP(IEEE80211_RADIOTAP_HE_##f, val))
 553
 554                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 555                         he.data6 |= HE_PREP(DATA6_NSTS,
 556                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 557                                                       status->enc_flags));
 558                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 559                 } else {
 560                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 561                 }
 562
 563 #define CHECK_GI(s) \
 564         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 565                      (int)NL80211_RATE_INFO_HE_GI_##s)
 566
 567                 CHECK_GI(0_8);
 568                 CHECK_GI(1_6);
 569                 CHECK_GI(3_2);
 570
 571                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 572                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 573                 he.data3 |= HE_PREP(DATA3_CODING,
 574                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 575
 576                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 577
 578                 switch (status->bw) {
 579                 case RATE_INFO_BW_20:
 580                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 581                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 582                         break;
 583                 case RATE_INFO_BW_40:
 584                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 585                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 586                         break;
 587                 case RATE_INFO_BW_80:
 588                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 589                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 590                         break;
 591                 case RATE_INFO_BW_160:
 592                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 593                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 594                         break;
 595                 case RATE_INFO_BW_HE_RU:
 596 #define CHECK_RU_ALLOC(s) \
 597         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 598                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 599
 600                         CHECK_RU_ALLOC(26);
 601                         CHECK_RU_ALLOC(52);
 602                         CHECK_RU_ALLOC(106);
 603                         CHECK_RU_ALLOC(242);
 604                         CHECK_RU_ALLOC(484);
 605                         CHECK_RU_ALLOC(996);
 606                         CHECK_RU_ALLOC(2x996);
 607
 608                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 609                                             status->he_ru + 4);
 610                         break;
 611                 default:
 612                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 613                 }
 614
 615                 /* ensure 2 byte alignment */
 616                 while ((pos - (u8 *)rthdr) & 1)
 617                         pos++;
 618                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 619                 memcpy(pos, &he, sizeof(he));
 620                 pos += sizeof(he);
 621         }
 622
 623         if (status->encoding == RX_ENC_HE &&
 624             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 625                 /* ensure 2 byte alignment */
 626                 while ((pos - (u8 *)rthdr) & 1)
 627                         pos++;
 628                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 629                 memcpy(pos, &he_mu, sizeof(he_mu));
 630                 pos += sizeof(he_mu);
 631         }
 632
 633         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 634                 *pos++ = status->chain_signal[chain];
 635                 *pos++ = chain;
 636         }
 637
 638         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 639                 /* ensure 2 byte alignment for the vendor field as required */
 640                 if ((pos - (u8 *)rthdr) & 1)
 641                         *pos++ = 0;
 642                 *pos++ = rtap.oui[0];
 643                 *pos++ = rtap.oui[1];
 644                 *pos++ = rtap.oui[2];
 645                 *pos++ = rtap.subns;
 646                 put_unaligned_le16(rtap.len, pos);
 647                 pos += 2;
 648                 /* align the actual payload as requested */
 649                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 650                         *pos++ = 0;
 651                 /* data (and possible padding) already follows */
 652         }
 653 }
 654
 655 static struct sk_buff *
 656 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 657                            struct sk_buff **origskb,
 658                            struct ieee80211_rate *rate,
 659                            int rtap_space, bool use_origskb)
 660 {
 661         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 662         int rt_hdrlen, needed_headroom;
 663         struct sk_buff *skb;
 664
 665         /* room for the radiotap header based on driver features */
 666         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 667         needed_headroom = rt_hdrlen - rtap_space;
 668
 669         if (use_origskb) {
 670                 /* only need to expand headroom if necessary */
 671                 skb = *origskb;
 672                 *origskb = NULL;
 673
 674                 /*
 675                  * This shouldn't trigger often because most devices have an
 676                  * RX header they pull before we get here, and that should
 677                  * be big enough for our radiotap information. We should
 678                  * probably export the length to drivers so that we can have
 679                  * them allocate enough headroom to start with.
 680                  */
 681                 if (skb_headroom(skb) < needed_headroom &&
 682                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 683                         dev_kfree_skb(skb);
 684                         return NULL;
 685                 }
 686         } else {
 687                 /*
 688                  * Need to make a copy and possibly remove radiotap header
 689                  * and FCS from the original.
 690                  */
 691                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 692
 693                 if (!skb)
 694                         return NULL;
 695         }
 696
 697         /* prepend radiotap information */
 698         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 699
 700         skb_reset_mac_header(skb);
 701         skb->ip_summed = CHECKSUM_UNNECESSARY;
 702         skb->pkt_type = PACKET_OTHERHOST;
 703         skb->protocol = htons(ETH_P_802_2);
 704
 705         return skb;
 706 }
 707
 708 /*
 709  * This function copies a received frame to all monitor interfaces and
 710  * returns a cleaned-up SKB that no longer includes the FCS nor the
 711  * radiotap header the driver might have added.
 712  */
 713 static struct sk_buff *
 714 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 715                      struct ieee80211_rate *rate)
 716 {
 717         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 718         struct ieee80211_sub_if_data *sdata;
 719         struct sk_buff *monskb = NULL;
 720         int present_fcs_len = 0;
 721         unsigned int rtap_space = 0;
 722         struct ieee80211_sub_if_data *monitor_sdata =
 723                 rcu_dereference(local->monitor_sdata);
 724         bool only_monitor = false;
 725
 726         if (status->flag & RX_FLAG_RADIOTAP_HE)
 727                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 728
 729         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 730                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 731
 732         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 733                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 734
 735                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 736         }
 737
 738         /*
 739          * First, we may need to make a copy of the skb because
 740          *  (1) we need to modify it for radiotap (if not present), and
 741          *  (2) the other RX handlers will modify the skb we got.
 742          *
 743          * We don't need to, of course, if we aren't going to return
 744          * the SKB because it has a bad FCS/PLCP checksum.
 745          */
 746
 747         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 748                 if (unlikely(origskb->len <= FCS_LEN)) {
 749                         /* driver bug */
 750                         WARN_ON(1);
 751                         dev_kfree_skb(origskb);
 752                         return NULL;
 753                 }
 754                 present_fcs_len = FCS_LEN;
 755         }
 756
 757         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 758         if (!pskb_may_pull(origskb, 2 + rtap_space)) {
 759                 dev_kfree_skb(origskb);
 760                 return NULL;
 761         }
 762
 763         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 764
 765         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 766                 if (only_monitor) {
 767                         dev_kfree_skb(origskb);
 768                         return NULL;
 769                 }
 770
 771                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 772                 return origskb;
 773         }
 774
 775         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 776
 777         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 778                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 779                                                  &local->mon_list);
 780
 781                 if (!monskb)
 782                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 783                                                             rate, rtap_space,
 784                                                             only_monitor &&
 785                                                             last_monitor);
 786
 787                 if (monskb) {
 788                         struct sk_buff *skb;
 789
 790                         if (last_monitor) {
 791                                 skb = monskb;
 792                                 monskb = NULL;
 793                         } else {
 794                                 skb = skb_clone(monskb, GFP_ATOMIC);
 795                         }
 796
 797                         if (skb) {
 798                                 skb->dev = sdata->dev;
 799                                 ieee80211_rx_stats(skb->dev, skb->len);
 800                                 netif_receive_skb(skb);
 801                         }
 802                 }
 803
 804                 if (last_monitor)
 805                         break;
 806         }
 807
 808         /* this happens if last_monitor was erroneously false */
 809         dev_kfree_skb(monskb);
 810
 811         /* ditto */
 812         if (!origskb)
 813                 return NULL;
 814
 815         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 816         return origskb;
 817 }
 818
 819 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 820 {
 821         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 822         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 823         int tid, seqno_idx, security_idx;
 824
 825         /* does the frame have a qos control field? */
 826         if (ieee80211_is_data_qos(hdr->frame_control)) {
 827                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 828                 /* frame has qos control */
 829                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 830                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 831                         status->rx_flags |= IEEE80211_RX_AMSDU;
 832
 833                 seqno_idx = tid;
 834                 security_idx = tid;
 835         } else {
 836                 /*
 837                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 838                  *
 839                  *      Sequence numbers for management frames, QoS data
 840                  *      frames with a broadcast/multicast address in the
 841                  *      Address 1 field, and all non-QoS data frames sent
 842                  *      by QoS STAs are assigned using an additional single
 843                  *      modulo-4096 counter, [...]
 844                  *
 845                  * We also use that counter for non-QoS STAs.
 846                  */
 847                 seqno_idx = IEEE80211_NUM_TIDS;
 848                 security_idx = 0;
 849                 if (ieee80211_is_mgmt(hdr->frame_control))
 850                         security_idx = IEEE80211_NUM_TIDS;
 851                 tid = 0;
 852         }
 853
 854         rx->seqno_idx = seqno_idx;
 855         rx->security_idx = security_idx;
 856         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 857          * For now, set skb->priority to 0 for other cases. */
 858         rx->skb->priority = (tid > 7) ? 0 : tid;
 859 }
 860
 861 /**
 862  * DOC: Packet alignment
 863  *
 864  * Drivers always need to pass packets that are aligned to two-byte boundaries
 865  * to the stack.
 866  *
 867  * Additionally, should, if possible, align the payload data in a way that
 868  * guarantees that the contained IP header is aligned to a four-byte
 869  * boundary. In the case of regular frames, this simply means aligning the
 870  * payload to a four-byte boundary (because either the IP header is directly
 871  * contained, or IV/RFC1042 headers that have a length divisible by four are
 872  * in front of it).  If the payload data is not properly aligned and the
 873  * architecture doesn't support efficient unaligned operations, mac80211
 874  * will align the data.
 875  *
 876  * With A-MSDU frames, however, the payload data address must yield two modulo
 877  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 878  * push the IP header further back to a multiple of four again. Thankfully, the
 879  * specs were sane enough this time around to require padding each A-MSDU
 880  * subframe to a length that is a multiple of four.
 881  *
 882  * Padding like Atheros hardware adds which is between the 802.11 header and
 883  * the payload is not supported, the driver is required to move the 802.11
 884  * header to be directly in front of the payload in that case.
 885  */
 886 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 887 {
 888 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 889         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 890 #endif
 891 }
 892
 893
 894 /* rx handlers */
 895
 896 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 897 {
 898         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 899
 900         if (is_multicast_ether_addr(hdr->addr1))
 901                 return 0;
 902
 903         return ieee80211_is_robust_mgmt_frame(skb);
 904 }
 905
 906
 907 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 908 {
 909         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 910
 911         if (!is_multicast_ether_addr(hdr->addr1))
 912                 return 0;
 913
 914         return ieee80211_is_robust_mgmt_frame(skb);
 915 }
 916
 917
 918 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 919 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 920 {
 921         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 922         struct ieee80211_mmie *mmie;
 923         struct ieee80211_mmie_16 *mmie16;
 924
 925         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 926                 return -1;
 927
 928         if (!ieee80211_is_robust_mgmt_frame(skb))
 929                 return -1; /* not a robust management frame */
 930
 931         mmie = (struct ieee80211_mmie *)
 932                 (skb->data + skb->len - sizeof(*mmie));
 933         if (mmie->element_id == WLAN_EID_MMIE &&
 934             mmie->length == sizeof(*mmie) - 2)
 935                 return le16_to_cpu(mmie->key_id);
 936
 937         mmie16 = (struct ieee80211_mmie_16 *)
 938                 (skb->data + skb->len - sizeof(*mmie16));
 939         if (skb->len >= 24 + sizeof(*mmie16) &&
 940             mmie16->element_id == WLAN_EID_MMIE &&
 941             mmie16->length == sizeof(*mmie16) - 2)
 942                 return le16_to_cpu(mmie16->key_id);
 943
 944         return -1;
 945 }
 946
 947 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 948                                   struct sk_buff *skb)
 949 {
 950         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 951         __le16 fc;
 952         int hdrlen;
 953         u8 keyid;
 954
 955         fc = hdr->frame_control;
 956         hdrlen = ieee80211_hdrlen(fc);
 957
 958         if (skb->len < hdrlen + cs->hdr_len)
 959                 return -EINVAL;
 960
 961         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 962         keyid &= cs->key_idx_mask;
 963         keyid >>= cs->key_idx_shift;
 964
 965         return keyid;
 966 }
 967
 968 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 969 {
 970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 971         char *dev_addr = rx->sdata->vif.addr;
 972
 973         if (ieee80211_is_data(hdr->frame_control)) {
 974                 if (is_multicast_ether_addr(hdr->addr1)) {
 975                         if (ieee80211_has_tods(hdr->frame_control) ||
 976                             !ieee80211_has_fromds(hdr->frame_control))
 977                                 return RX_DROP_MONITOR;
 978                         if (ether_addr_equal(hdr->addr3, dev_addr))
 979                                 return RX_DROP_MONITOR;
 980                 } else {
 981                         if (!ieee80211_has_a4(hdr->frame_control))
 982                                 return RX_DROP_MONITOR;
 983                         if (ether_addr_equal(hdr->addr4, dev_addr))
 984                                 return RX_DROP_MONITOR;
 985                 }
 986         }
 987
 988         /* If there is not an established peer link and this is not a peer link
 989          * establisment frame, beacon or probe, drop the frame.
 990          */
 991
 992         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 993                 struct ieee80211_mgmt *mgmt;
 994
 995                 if (!ieee80211_is_mgmt(hdr->frame_control))
 996                         return RX_DROP_MONITOR;
 997
 998                 if (ieee80211_is_action(hdr->frame_control)) {
 999                         u8 category;
1000
1001                         /* make sure category field is present */
1002                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1003                                 return RX_DROP_MONITOR;
1004
1005                         mgmt = (struct ieee80211_mgmt *)hdr;
1006                         category = mgmt->u.action.category;
1007                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1008                             category != WLAN_CATEGORY_SELF_PROTECTED)
1009                                 return RX_DROP_MONITOR;
1010                         return RX_CONTINUE;
1011                 }
1012
1013                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1014                     ieee80211_is_probe_resp(hdr->frame_control) ||
1015                     ieee80211_is_beacon(hdr->frame_control) ||
1016                     ieee80211_is_auth(hdr->frame_control))
1017                         return RX_CONTINUE;
1018
1019                 return RX_DROP_MONITOR;
1020         }
1021
1022         return RX_CONTINUE;
1023 }
1024
1025 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1026                                               int index)
1027 {
1028         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1029         struct sk_buff *tail = skb_peek_tail(frames);
1030         struct ieee80211_rx_status *status;
1031
1032         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1033                 return true;
1034
1035         if (!tail)
1036                 return false;
1037
1038         status = IEEE80211_SKB_RXCB(tail);
1039         if (status->flag & RX_FLAG_AMSDU_MORE)
1040                 return false;
1041
1042         return true;
1043 }
1044
1045 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1046                                             struct tid_ampdu_rx *tid_agg_rx,
1047                                             int index,
1048                                             struct sk_buff_head *frames)
1049 {
1050         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1051         struct sk_buff *skb;
1052         struct ieee80211_rx_status *status;
1053
1054         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1055
1056         if (skb_queue_empty(skb_list))
1057                 goto no_frame;
1058
1059         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1060                 __skb_queue_purge(skb_list);
1061                 goto no_frame;
1062         }
1063
1064         /* release frames from the reorder ring buffer */
1065         tid_agg_rx->stored_mpdu_num--;
1066         while ((skb = __skb_dequeue(skb_list))) {
1067                 status = IEEE80211_SKB_RXCB(skb);
1068                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1069                 __skb_queue_tail(frames, skb);
1070         }
1071
1072 no_frame:
1073         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1074         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1075 }
1076
1077 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1078                                              struct tid_ampdu_rx *tid_agg_rx,
1079                                              u16 head_seq_num,
1080                                              struct sk_buff_head *frames)
1081 {
1082         int index;
1083
1084         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1085
1086         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1087                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1088                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1089                                                 frames);
1090         }
1091 }
1092
1093 /*
1094  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1095  * the skb was added to the buffer longer than this time ago, the earlier
1096  * frames that have not yet been received are assumed to be lost and the skb
1097  * can be released for processing. This may also release other skb's from the
1098  * reorder buffer if there are no additional gaps between the frames.
1099  *
1100  * Callers must hold tid_agg_rx->reorder_lock.
1101  */
1102 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1103
1104 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1105                                           struct tid_ampdu_rx *tid_agg_rx,
1106                                           struct sk_buff_head *frames)
1107 {
1108         int index, i, j;
1109
1110         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1111
1112         /* release the buffer until next missing frame */
1113         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1114         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1115             tid_agg_rx->stored_mpdu_num) {
1116                 /*
1117                  * No buffers ready to be released, but check whether any
1118                  * frames in the reorder buffer have timed out.
1119                  */
1120                 int skipped = 1;
1121                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1122                      j = (j + 1) % tid_agg_rx->buf_size) {
1123                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1124                                 skipped++;
1125                                 continue;
1126                         }
1127                         if (skipped &&
1128                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1129                                         HT_RX_REORDER_BUF_TIMEOUT))
1130                                 goto set_release_timer;
1131
1132                         /* don't leave incomplete A-MSDUs around */
1133                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1134                              i = (i + 1) % tid_agg_rx->buf_size)
1135                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1136
1137                         ht_dbg_ratelimited(sdata,
1138                                            "release an RX reorder frame due to timeout on earlier frames\n");
1139                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1140                                                         frames);
1141
1142                         /*
1143                          * Increment the head seq# also for the skipped slots.
1144                          */
1145                         tid_agg_rx->head_seq_num =
1146                                 (tid_agg_rx->head_seq_num +
1147                                  skipped) & IEEE80211_SN_MASK;
1148                         skipped = 0;
1149                 }
1150         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1151                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1152                                                 frames);
1153                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1154         }
1155
1156         if (tid_agg_rx->stored_mpdu_num) {
1157                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1158
1159                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1160                      j = (j + 1) % tid_agg_rx->buf_size) {
1161                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1162                                 break;
1163                 }
1164
1165  set_release_timer:
1166
1167                 if (!tid_agg_rx->removed)
1168                         mod_timer(&tid_agg_rx->reorder_timer,
1169                                   tid_agg_rx->reorder_time[j] + 1 +
1170                                   HT_RX_REORDER_BUF_TIMEOUT);
1171         } else {
1172                 del_timer(&tid_agg_rx->reorder_timer);
1173         }
1174 }
1175
1176 /*
1177  * As this function belongs to the RX path it must be under
1178  * rcu_read_lock protection. It returns false if the frame
1179  * can be processed immediately, true if it was consumed.
1180  */
1181 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1182                                              struct tid_ampdu_rx *tid_agg_rx,
1183                                              struct sk_buff *skb,
1184                                              struct sk_buff_head *frames)
1185 {
1186         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1187         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1188         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1189         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1190         u16 head_seq_num, buf_size;
1191         int index;
1192         bool ret = true;
1193
1194         spin_lock(&tid_agg_rx->reorder_lock);
1195
1196         /*
1197          * Offloaded BA sessions have no known starting sequence number so pick
1198          * one from first Rxed frame for this tid after BA was started.
1199          */
1200         if (unlikely(tid_agg_rx->auto_seq)) {
1201                 tid_agg_rx->auto_seq = false;
1202                 tid_agg_rx->ssn = mpdu_seq_num;
1203                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1204         }
1205
1206         buf_size = tid_agg_rx->buf_size;
1207         head_seq_num = tid_agg_rx->head_seq_num;
1208
1209         /*
1210          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1211          * be reordered.
1212          */
1213         if (unlikely(!tid_agg_rx->started)) {
1214                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1215                         ret = false;
1216                         goto out;
1217                 }
1218                 tid_agg_rx->started = true;
1219         }
1220
1221         /* frame with out of date sequence number */
1222         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1223                 dev_kfree_skb(skb);
1224                 goto out;
1225         }
1226
1227         /*
1228          * If frame the sequence number exceeds our buffering window
1229          * size release some previous frames to make room for this one.
1230          */
1231         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1232                 head_seq_num = ieee80211_sn_inc(
1233                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1234                 /* release stored frames up to new head to stack */
1235                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1236                                                  head_seq_num, frames);
1237         }
1238
1239         /* Now the new frame is always in the range of the reordering buffer */
1240
1241         index = mpdu_seq_num % tid_agg_rx->buf_size;
1242
1243         /* check if we already stored this frame */
1244         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1245                 dev_kfree_skb(skb);
1246                 goto out;
1247         }
1248
1249         /*
1250          * If the current MPDU is in the right order and nothing else
1251          * is stored we can process it directly, no need to buffer it.
1252          * If it is first but there's something stored, we may be able
1253          * to release frames after this one.
1254          */
1255         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1256             tid_agg_rx->stored_mpdu_num == 0) {
1257                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1258                         tid_agg_rx->head_seq_num =
1259                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1260                 ret = false;
1261                 goto out;
1262         }
1263
1264         /* put the frame in the reordering buffer */
1265         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1266         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1267                 tid_agg_rx->reorder_time[index] = jiffies;
1268                 tid_agg_rx->stored_mpdu_num++;
1269                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1270         }
1271
1272  out:
1273         spin_unlock(&tid_agg_rx->reorder_lock);
1274         return ret;
1275 }
1276
1277 /*
1278  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1279  * true if the MPDU was buffered, false if it should be processed.
1280  */
1281 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1282                                        struct sk_buff_head *frames)
1283 {
1284         struct sk_buff *skb = rx->skb;
1285         struct ieee80211_local *local = rx->local;
1286         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1287         struct sta_info *sta = rx->sta;
1288         struct tid_ampdu_rx *tid_agg_rx;
1289         u16 sc;
1290         u8 tid, ack_policy;
1291
1292         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1293             is_multicast_ether_addr(hdr->addr1))
1294                 goto dont_reorder;
1295
1296         /*
1297          * filter the QoS data rx stream according to
1298          * STA/TID and check if this STA/TID is on aggregation
1299          */
1300
1301         if (!sta)
1302                 goto dont_reorder;
1303
1304         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1305                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1306         tid = ieee80211_get_tid(hdr);
1307
1308         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1309         if (!tid_agg_rx) {
1310                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1311                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1312                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1313                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1314                                              WLAN_BACK_RECIPIENT,
1315                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1316                 goto dont_reorder;
1317         }
1318
1319         /* qos null data frames are excluded */
1320         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1321                 goto dont_reorder;
1322
1323         /* not part of a BA session */
1324         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1325             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1326                 goto dont_reorder;
1327
1328         /* new, potentially un-ordered, ampdu frame - process it */
1329
1330         /* reset session timer */
1331         if (tid_agg_rx->timeout)
1332                 tid_agg_rx->last_rx = jiffies;
1333
1334         /* if this mpdu is fragmented - terminate rx aggregation session */
1335         sc = le16_to_cpu(hdr->seq_ctrl);
1336         if (sc & IEEE80211_SCTL_FRAG) {
1337                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1338                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1339                 return;
1340         }
1341
1342         /*
1343          * No locking needed -- we will only ever process one
1344          * RX packet at a time, and thus own tid_agg_rx. All
1345          * other code manipulating it needs to (and does) make
1346          * sure that we cannot get to it any more before doing
1347          * anything with it.
1348          */
1349         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1350                                              frames))
1351                 return;
1352
1353  dont_reorder:
1354         __skb_queue_tail(frames, skb);
1355 }
1356
1357 static ieee80211_rx_result debug_noinline
1358 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1359 {
1360         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1361         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1362
1363         if (status->flag & RX_FLAG_DUP_VALIDATED)
1364                 return RX_CONTINUE;
1365
1366         /*
1367          * Drop duplicate 802.11 retransmissions
1368          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1369          */
1370
1371         if (rx->skb->len < 24)
1372                 return RX_CONTINUE;
1373
1374         if (ieee80211_is_ctl(hdr->frame_control) ||
1375             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1376             is_multicast_ether_addr(hdr->addr1))
1377                 return RX_CONTINUE;
1378
1379         if (!rx->sta)
1380                 return RX_CONTINUE;
1381
1382         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1383                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1384                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1385                 rx->sta->rx_stats.num_duplicates++;
1386                 return RX_DROP_UNUSABLE;
1387         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1388                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1389         }
1390
1391         return RX_CONTINUE;
1392 }
1393
1394 static ieee80211_rx_result debug_noinline
1395 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1396 {
1397         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1398
1399         /* Drop disallowed frame classes based on STA auth/assoc state;
1400          * IEEE 802.11, Chap 5.5.
1401          *
1402          * mac80211 filters only based on association state, i.e. it drops
1403          * Class 3 frames from not associated stations. hostapd sends
1404          * deauth/disassoc frames when needed. In addition, hostapd is
1405          * responsible for filtering on both auth and assoc states.
1406          */
1407
1408         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1409                 return ieee80211_rx_mesh_check(rx);
1410
1411         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1412                       ieee80211_is_pspoll(hdr->frame_control)) &&
1413                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1414                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1415                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1416                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1417                 /*
1418                  * accept port control frames from the AP even when it's not
1419                  * yet marked ASSOC to prevent a race where we don't set the
1420                  * assoc bit quickly enough before it sends the first frame
1421                  */
1422                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1423                     ieee80211_is_data_present(hdr->frame_control)) {
1424                         unsigned int hdrlen;
1425                         __be16 ethertype;
1426
1427                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1428
1429                         if (rx->skb->len < hdrlen + 8)
1430                                 return RX_DROP_MONITOR;
1431
1432                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1433                         if (ethertype == rx->sdata->control_port_protocol)
1434                                 return RX_CONTINUE;
1435                 }
1436
1437                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1438                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1439                                                hdr->addr2,
1440                                                GFP_ATOMIC))
1441                         return RX_DROP_UNUSABLE;
1442
1443                 return RX_DROP_MONITOR;
1444         }
1445
1446         return RX_CONTINUE;
1447 }
1448
1449
1450 static ieee80211_rx_result debug_noinline
1451 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1452 {
1453         struct ieee80211_local *local;
1454         struct ieee80211_hdr *hdr;
1455         struct sk_buff *skb;
1456
1457         local = rx->local;
1458         skb = rx->skb;
1459         hdr = (struct ieee80211_hdr *) skb->data;
1460
1461         if (!local->pspolling)
1462                 return RX_CONTINUE;
1463
1464         if (!ieee80211_has_fromds(hdr->frame_control))
1465                 /* this is not from AP */
1466                 return RX_CONTINUE;
1467
1468         if (!ieee80211_is_data(hdr->frame_control))
1469                 return RX_CONTINUE;
1470
1471         if (!ieee80211_has_moredata(hdr->frame_control)) {
1472                 /* AP has no more frames buffered for us */
1473                 local->pspolling = false;
1474                 return RX_CONTINUE;
1475         }
1476
1477         /* more data bit is set, let's request a new frame from the AP */
1478         ieee80211_send_pspoll(local, rx->sdata);
1479
1480         return RX_CONTINUE;
1481 }
1482
1483 static void sta_ps_start(struct sta_info *sta)
1484 {
1485         struct ieee80211_sub_if_data *sdata = sta->sdata;
1486         struct ieee80211_local *local = sdata->local;
1487         struct ps_data *ps;
1488         int tid;
1489
1490         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1491             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1492                 ps = &sdata->bss->ps;
1493         else
1494                 return;
1495
1496         atomic_inc(&ps->num_sta_ps);
1497         set_sta_flag(sta, WLAN_STA_PS_STA);
1498         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1499                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1500         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1501                sta->sta.addr, sta->sta.aid);
1502
1503         ieee80211_clear_fast_xmit(sta);
1504
1505         if (!sta->sta.txq[0])
1506                 return;
1507
1508         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1509                 if (txq_has_queue(sta->sta.txq[tid]))
1510                         set_bit(tid, &sta->txq_buffered_tids);
1511                 else
1512                         clear_bit(tid, &sta->txq_buffered_tids);
1513         }
1514 }
1515
1516 static void sta_ps_end(struct sta_info *sta)
1517 {
1518         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1519                sta->sta.addr, sta->sta.aid);
1520
1521         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1522                 /*
1523                  * Clear the flag only if the other one is still set
1524                  * so that the TX path won't start TX'ing new frames
1525                  * directly ... In the case that the driver flag isn't
1526                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1527                  */
1528                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1529                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1530                        sta->sta.addr, sta->sta.aid);
1531                 return;
1532         }
1533
1534         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1535         clear_sta_flag(sta, WLAN_STA_PS_STA);
1536         ieee80211_sta_ps_deliver_wakeup(sta);
1537 }
1538
1539 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1540 {
1541         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1542         bool in_ps;
1543
1544         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1545
1546         /* Don't let the same PS state be set twice */
1547         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1548         if ((start && in_ps) || (!start && !in_ps))
1549                 return -EINVAL;
1550
1551         if (start)
1552                 sta_ps_start(sta);
1553         else
1554                 sta_ps_end(sta);
1555
1556         return 0;
1557 }
1558 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1559
1560 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1561 {
1562         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1563
1564         if (test_sta_flag(sta, WLAN_STA_SP))
1565                 return;
1566
1567         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1568                 ieee80211_sta_ps_deliver_poll_response(sta);
1569         else
1570                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1571 }
1572 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1573
1574 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1575 {
1576         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1577         int ac = ieee80211_ac_from_tid(tid);
1578
1579         /*
1580          * If this AC is not trigger-enabled do nothing unless the
1581          * driver is calling us after it already checked.
1582          *
1583          * NB: This could/should check a separate bitmap of trigger-
1584          * enabled queues, but for now we only implement uAPSD w/o
1585          * TSPEC changes to the ACs, so they're always the same.
1586          */
1587         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1588             tid != IEEE80211_NUM_TIDS)
1589                 return;
1590
1591         /* if we are in a service period, do nothing */
1592         if (test_sta_flag(sta, WLAN_STA_SP))
1593                 return;
1594
1595         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1596                 ieee80211_sta_ps_deliver_uapsd(sta);
1597         else
1598                 set_sta_flag(sta, WLAN_STA_UAPSD);
1599 }
1600 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1601
1602 static ieee80211_rx_result debug_noinline
1603 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1604 {
1605         struct ieee80211_sub_if_data *sdata = rx->sdata;
1606         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1607         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1608
1609         if (!rx->sta)
1610                 return RX_CONTINUE;
1611
1612         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1613             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1614                 return RX_CONTINUE;
1615
1616         /*
1617          * The device handles station powersave, so don't do anything about
1618          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1619          * it to mac80211 since they're handled.)
1620          */
1621         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1622                 return RX_CONTINUE;
1623
1624         /*
1625          * Don't do anything if the station isn't already asleep. In
1626          * the uAPSD case, the station will probably be marked asleep,
1627          * in the PS-Poll case the station must be confused ...
1628          */
1629         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1630                 return RX_CONTINUE;
1631
1632         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1633                 ieee80211_sta_pspoll(&rx->sta->sta);
1634
1635                 /* Free PS Poll skb here instead of returning RX_DROP that would
1636                  * count as an dropped frame. */
1637                 dev_kfree_skb(rx->skb);
1638
1639                 return RX_QUEUED;
1640         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1641                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1642                    ieee80211_has_pm(hdr->frame_control) &&
1643                    (ieee80211_is_data_qos(hdr->frame_control) ||
1644                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1645                 u8 tid = ieee80211_get_tid(hdr);
1646
1647                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1648         }
1649
1650         return RX_CONTINUE;
1651 }
1652
1653 static ieee80211_rx_result debug_noinline
1654 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1655 {
1656         struct sta_info *sta = rx->sta;
1657         struct sk_buff *skb = rx->skb;
1658         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1659         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1660         int i;
1661
1662         if (!sta)
1663                 return RX_CONTINUE;
1664
1665         /*
1666          * Update last_rx only for IBSS packets which are for the current
1667          * BSSID and for station already AUTHORIZED to avoid keeping the
1668          * current IBSS network alive in cases where other STAs start
1669          * using different BSSID. This will also give the station another
1670          * chance to restart the authentication/authorization in case
1671          * something went wrong the first time.
1672          */
1673         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1674                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1675                                                 NL80211_IFTYPE_ADHOC);
1676                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1677                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1678                         sta->rx_stats.last_rx = jiffies;
1679                         if (ieee80211_is_data(hdr->frame_control) &&
1680                             !is_multicast_ether_addr(hdr->addr1))
1681                                 sta->rx_stats.last_rate =
1682                                         sta_stats_encode_rate(status);
1683                 }
1684         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1685                 sta->rx_stats.last_rx = jiffies;
1686         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1687                 /*
1688                  * Mesh beacons will update last_rx when if they are found to
1689                  * match the current local configuration when processed.
1690                  */
1691                 sta->rx_stats.last_rx = jiffies;
1692                 if (ieee80211_is_data(hdr->frame_control))
1693                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1694         }
1695
1696         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1697                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1698
1699         sta->rx_stats.fragments++;
1700
1701         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1702         sta->rx_stats.bytes += rx->skb->len;
1703         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1704
1705         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1706                 sta->rx_stats.last_signal = status->signal;
1707                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1708         }
1709
1710         if (status->chains) {
1711                 sta->rx_stats.chains = status->chains;
1712                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1713                         int signal = status->chain_signal[i];
1714
1715                         if (!(status->chains & BIT(i)))
1716                                 continue;
1717
1718                         sta->rx_stats.chain_signal_last[i] = signal;
1719                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1720                                         -signal);
1721                 }
1722         }
1723
1724         /*
1725          * Change STA power saving mode only at the end of a frame
1726          * exchange sequence, and only for a data or management
1727          * frame as specified in IEEE 802.11-2016 11.2.3.2
1728          */
1729         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1730             !ieee80211_has_morefrags(hdr->frame_control) &&
1731             !is_multicast_ether_addr(hdr->addr1) &&
1732             (ieee80211_is_mgmt(hdr->frame_control) ||
1733              ieee80211_is_data(hdr->frame_control)) &&
1734             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1735             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1736              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1737                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1738                         if (!ieee80211_has_pm(hdr->frame_control))
1739                                 sta_ps_end(sta);
1740                 } else {
1741                         if (ieee80211_has_pm(hdr->frame_control))
1742                                 sta_ps_start(sta);
1743                 }
1744         }
1745
1746         /* mesh power save support */
1747         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1748                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1749
1750         /*
1751          * Drop (qos-)data::nullfunc frames silently, since they
1752          * are used only to control station power saving mode.
1753          */
1754         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1755             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1756                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1757
1758                 /*
1759                  * If we receive a 4-addr nullfunc frame from a STA
1760                  * that was not moved to a 4-addr STA vlan yet send
1761                  * the event to userspace and for older hostapd drop
1762                  * the frame to the monitor interface.
1763                  */
1764                 if (ieee80211_has_a4(hdr->frame_control) &&
1765                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1766                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1767                       !rx->sdata->u.vlan.sta))) {
1768                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1769                                 cfg80211_rx_unexpected_4addr_frame(
1770                                         rx->sdata->dev, sta->sta.addr,
1771                                         GFP_ATOMIC);
1772                         return RX_DROP_MONITOR;
1773                 }
1774                 /*
1775                  * Update counter and free packet here to avoid
1776                  * counting this as a dropped packed.
1777                  */
1778                 sta->rx_stats.packets++;
1779                 dev_kfree_skb(rx->skb);
1780                 return RX_QUEUED;
1781         }
1782
1783         return RX_CONTINUE;
1784 } /* ieee80211_rx_h_sta_process */
1785
1786 static ieee80211_rx_result debug_noinline
1787 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1788 {
1789         struct sk_buff *skb = rx->skb;
1790         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1791         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1792         int keyidx;
1793         int hdrlen;
1794         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1795         struct ieee80211_key *sta_ptk = NULL;
1796         int mmie_keyidx = -1;
1797         __le16 fc;
1798         const struct ieee80211_cipher_scheme *cs = NULL;
1799
1800         /*
1801          * Key selection 101
1802          *
1803          * There are four types of keys:
1804          *  - GTK (group keys)
1805          *  - IGTK (group keys for management frames)
1806          *  - PTK (pairwise keys)
1807          *  - STK (station-to-station pairwise keys)
1808          *
1809          * When selecting a key, we have to distinguish between multicast
1810          * (including broadcast) and unicast frames, the latter can only
1811          * use PTKs and STKs while the former always use GTKs and IGTKs.
1812          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1813          * unicast frames can also use key indices like GTKs. Hence, if we
1814          * don't have a PTK/STK we check the key index for a WEP key.
1815          *
1816          * Note that in a regular BSS, multicast frames are sent by the
1817          * AP only, associated stations unicast the frame to the AP first
1818          * which then multicasts it on their behalf.
1819          *
1820          * There is also a slight problem in IBSS mode: GTKs are negotiated
1821          * with each station, that is something we don't currently handle.
1822          * The spec seems to expect that one negotiates the same key with
1823          * every station but there's no such requirement; VLANs could be
1824          * possible.
1825          */
1826
1827         /* start without a key */
1828         rx->key = NULL;
1829         fc = hdr->frame_control;
1830
1831         if (rx->sta) {
1832                 int keyid = rx->sta->ptk_idx;
1833
1834                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1835                         cs = rx->sta->cipher_scheme;
1836                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1837                         if (unlikely(keyid < 0))
1838                                 return RX_DROP_UNUSABLE;
1839                 }
1840                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1841         }
1842
1843         if (!ieee80211_has_protected(fc))
1844                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1845
1846         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1847                 rx->key = sta_ptk;
1848                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1849                     (status->flag & RX_FLAG_IV_STRIPPED))
1850                         return RX_CONTINUE;
1851                 /* Skip decryption if the frame is not protected. */
1852                 if (!ieee80211_has_protected(fc))
1853                         return RX_CONTINUE;
1854         } else if (mmie_keyidx >= 0) {
1855                 /* Broadcast/multicast robust management frame / BIP */
1856                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1857                     (status->flag & RX_FLAG_IV_STRIPPED))
1858                         return RX_CONTINUE;
1859
1860                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1861                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1862                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1863                 if (rx->sta) {
1864                         if (ieee80211_is_group_privacy_action(skb) &&
1865                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1866                                 return RX_DROP_MONITOR;
1867
1868                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1869                 }
1870                 if (!rx->key)
1871                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1872         } else if (!ieee80211_has_protected(fc)) {
1873                 /*
1874                  * The frame was not protected, so skip decryption. However, we
1875                  * need to set rx->key if there is a key that could have been
1876                  * used so that the frame may be dropped if encryption would
1877                  * have been expected.
1878                  */
1879                 struct ieee80211_key *key = NULL;
1880                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1881                 int i;
1882
1883                 if (ieee80211_is_mgmt(fc) &&
1884                     is_multicast_ether_addr(hdr->addr1) &&
1885                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1886                         rx->key = key;
1887                 else {
1888                         if (rx->sta) {
1889                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1890                                         key = rcu_dereference(rx->sta->gtk[i]);
1891                                         if (key)
1892                                                 break;
1893                                 }
1894                         }
1895                         if (!key) {
1896                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1897                                         key = rcu_dereference(sdata->keys[i]);
1898                                         if (key)
1899                                                 break;
1900                                 }
1901                         }
1902                         if (key)
1903                                 rx->key = key;
1904                 }
1905                 return RX_CONTINUE;
1906         } else {
1907                 u8 keyid;
1908
1909                 /*
1910                  * The device doesn't give us the IV so we won't be
1911                  * able to look up the key. That's ok though, we
1912                  * don't need to decrypt the frame, we just won't
1913                  * be able to keep statistics accurate.
1914                  * Except for key threshold notifications, should
1915                  * we somehow allow the driver to tell us which key
1916                  * the hardware used if this flag is set?
1917                  */
1918                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1919                     (status->flag & RX_FLAG_IV_STRIPPED))
1920                         return RX_CONTINUE;
1921
1922                 hdrlen = ieee80211_hdrlen(fc);
1923
1924                 if (cs) {
1925                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1926
1927                         if (unlikely(keyidx < 0))
1928                                 return RX_DROP_UNUSABLE;
1929                 } else {
1930                         if (rx->skb->len < 8 + hdrlen)
1931                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1932                         /*
1933                          * no need to call ieee80211_wep_get_keyidx,
1934                          * it verifies a bunch of things we've done already
1935                          */
1936                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1937                         keyidx = keyid >> 6;
1938                 }
1939
1940                 /* check per-station GTK first, if multicast packet */
1941                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1942                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1943
1944                 /* if not found, try default key */
1945                 if (!rx->key) {
1946                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1947
1948                         /*
1949                          * RSNA-protected unicast frames should always be
1950                          * sent with pairwise or station-to-station keys,
1951                          * but for WEP we allow using a key index as well.
1952                          */
1953                         if (rx->key &&
1954                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1955                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1956                             !is_multicast_ether_addr(hdr->addr1))
1957                                 rx->key = NULL;
1958                 }
1959         }
1960
1961         if (rx->key) {
1962                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1963                         return RX_DROP_MONITOR;
1964
1965                 /* TODO: add threshold stuff again */
1966         } else {
1967                 return RX_DROP_MONITOR;
1968         }
1969
1970         switch (rx->key->conf.cipher) {
1971         case WLAN_CIPHER_SUITE_WEP40:
1972         case WLAN_CIPHER_SUITE_WEP104:
1973                 result = ieee80211_crypto_wep_decrypt(rx);
1974                 break;
1975         case WLAN_CIPHER_SUITE_TKIP:
1976                 result = ieee80211_crypto_tkip_decrypt(rx);
1977                 break;
1978         case WLAN_CIPHER_SUITE_CCMP:
1979                 result = ieee80211_crypto_ccmp_decrypt(
1980                         rx, IEEE80211_CCMP_MIC_LEN);
1981                 break;
1982         case WLAN_CIPHER_SUITE_CCMP_256:
1983                 result = ieee80211_crypto_ccmp_decrypt(
1984                         rx, IEEE80211_CCMP_256_MIC_LEN);
1985                 break;
1986         case WLAN_CIPHER_SUITE_AES_CMAC:
1987                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1988                 break;
1989         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1990                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1991                 break;
1992         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1993         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1994                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1995                 break;
1996         case WLAN_CIPHER_SUITE_GCMP:
1997         case WLAN_CIPHER_SUITE_GCMP_256:
1998                 result = ieee80211_crypto_gcmp_decrypt(rx);
1999                 break;
2000         default:
2001                 result = ieee80211_crypto_hw_decrypt(rx);
2002         }
2003
2004         /* the hdr variable is invalid after the decrypt handlers */
2005
2006         /* either the frame has been decrypted or will be dropped */
2007         status->flag |= RX_FLAG_DECRYPTED;
2008
2009         return result;
2010 }
2011
2012 static inline struct ieee80211_fragment_entry *
2013 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2014                          unsigned int frag, unsigned int seq, int rx_queue,
2015                          struct sk_buff **skb)
2016 {
2017         struct ieee80211_fragment_entry *entry;
2018
2019         entry = &sdata->fragments[sdata->fragment_next++];
2020         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2021                 sdata->fragment_next = 0;
2022
2023         if (!skb_queue_empty(&entry->skb_list))
2024                 __skb_queue_purge(&entry->skb_list);
2025
2026         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2027         *skb = NULL;
2028         entry->first_frag_time = jiffies;
2029         entry->seq = seq;
2030         entry->rx_queue = rx_queue;
2031         entry->last_frag = frag;
2032         entry->check_sequential_pn = false;
2033         entry->extra_len = 0;
2034
2035         return entry;
2036 }
2037
2038 static inline struct ieee80211_fragment_entry *
2039 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2040                           unsigned int frag, unsigned int seq,
2041                           int rx_queue, struct ieee80211_hdr *hdr)
2042 {
2043         struct ieee80211_fragment_entry *entry;
2044         int i, idx;
2045
2046         idx = sdata->fragment_next;
2047         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2048                 struct ieee80211_hdr *f_hdr;
2049
2050                 idx--;
2051                 if (idx < 0)
2052                         idx = IEEE80211_FRAGMENT_MAX - 1;
2053
2054                 entry = &sdata->fragments[idx];
2055                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2056                     entry->rx_queue != rx_queue ||
2057                     entry->last_frag + 1 != frag)
2058                         continue;
2059
2060                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
2061
2062                 /*
2063                  * Check ftype and addresses are equal, else check next fragment
2064                  */
2065                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2066                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2067                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2068                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2069                         continue;
2070
2071                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2072                         __skb_queue_purge(&entry->skb_list);
2073                         continue;
2074                 }
2075                 return entry;
2076         }
2077
2078         return NULL;
2079 }
2080
2081 static ieee80211_rx_result debug_noinline
2082 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2083 {
2084         struct ieee80211_hdr *hdr;
2085         u16 sc;
2086         __le16 fc;
2087         unsigned int frag, seq;
2088         struct ieee80211_fragment_entry *entry;
2089         struct sk_buff *skb;
2090
2091         hdr = (struct ieee80211_hdr *)rx->skb->data;
2092         fc = hdr->frame_control;
2093
2094         if (ieee80211_is_ctl(fc))
2095                 return RX_CONTINUE;
2096
2097         sc = le16_to_cpu(hdr->seq_ctrl);
2098         frag = sc & IEEE80211_SCTL_FRAG;
2099
2100         if (is_multicast_ether_addr(hdr->addr1)) {
2101                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2102                 goto out_no_led;
2103         }
2104
2105         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2106                 goto out;
2107
2108         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2109
2110         if (skb_linearize(rx->skb))
2111                 return RX_DROP_UNUSABLE;
2112
2113         /*
2114          *  skb_linearize() might change the skb->data and
2115          *  previously cached variables (in this case, hdr) need to
2116          *  be refreshed with the new data.
2117          */
2118         hdr = (struct ieee80211_hdr *)rx->skb->data;
2119         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2120
2121         if (frag == 0) {
2122                 /* This is the first fragment of a new frame. */
2123                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2124                                                  rx->seqno_idx, &(rx->skb));
2125                 if (rx->key &&
2126                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2127                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2128                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2129                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2130                     ieee80211_has_protected(fc)) {
2131                         int queue = rx->security_idx;
2132
2133                         /* Store CCMP/GCMP PN so that we can verify that the
2134                          * next fragment has a sequential PN value.
2135                          */
2136                         entry->check_sequential_pn = true;
2137                         memcpy(entry->last_pn,
2138                                rx->key->u.ccmp.rx_pn[queue],
2139                                IEEE80211_CCMP_PN_LEN);
2140                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2141                                               u.ccmp.rx_pn) !=
2142                                      offsetof(struct ieee80211_key,
2143                                               u.gcmp.rx_pn));
2144                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2145                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2146                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2147                                      IEEE80211_GCMP_PN_LEN);
2148                 }
2149                 return RX_QUEUED;
2150         }
2151
2152         /* This is a fragment for a frame that should already be pending in
2153          * fragment cache. Add this fragment to the end of the pending entry.
2154          */
2155         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2156                                           rx->seqno_idx, hdr);
2157         if (!entry) {
2158                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2159                 return RX_DROP_MONITOR;
2160         }
2161
2162         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2163          *  MPDU PN values are not incrementing in steps of 1."
2164          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2165          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2166          */
2167         if (entry->check_sequential_pn) {
2168                 int i;
2169                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2170                 int queue;
2171
2172                 if (!rx->key ||
2173                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2174                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2175                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2176                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2177                         return RX_DROP_UNUSABLE;
2178                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2179                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2180                         pn[i]++;
2181                         if (pn[i])
2182                                 break;
2183                 }
2184                 queue = rx->security_idx;
2185                 rpn = rx->key->u.ccmp.rx_pn[queue];
2186                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2187                         return RX_DROP_UNUSABLE;
2188                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2189         }
2190
2191         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2192         __skb_queue_tail(&entry->skb_list, rx->skb);
2193         entry->last_frag = frag;
2194         entry->extra_len += rx->skb->len;
2195         if (ieee80211_has_morefrags(fc)) {
2196                 rx->skb = NULL;
2197                 return RX_QUEUED;
2198         }
2199
2200         rx->skb = __skb_dequeue(&entry->skb_list);
2201         if (skb_tailroom(rx->skb) < entry->extra_len) {
2202                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2203                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2204                                               GFP_ATOMIC))) {
2205                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2206                         __skb_queue_purge(&entry->skb_list);
2207                         return RX_DROP_UNUSABLE;
2208                 }
2209         }
2210         while ((skb = __skb_dequeue(&entry->skb_list))) {
2211                 skb_put_data(rx->skb, skb->data, skb->len);
2212                 dev_kfree_skb(skb);
2213         }
2214
2215  out:
2216         ieee80211_led_rx(rx->local);
2217  out_no_led:
2218         if (rx->sta)
2219                 rx->sta->rx_stats.packets++;
2220         return RX_CONTINUE;
2221 }
2222
2223 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2224 {
2225         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2226                 return -EACCES;
2227
2228         return 0;
2229 }
2230
2231 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2232 {
2233         struct sk_buff *skb = rx->skb;
2234         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2235
2236         /*
2237          * Pass through unencrypted frames if the hardware has
2238          * decrypted them already.
2239          */
2240         if (status->flag & RX_FLAG_DECRYPTED)
2241                 return 0;
2242
2243         /* Drop unencrypted frames if key is set. */
2244         if (unlikely(!ieee80211_has_protected(fc) &&
2245                      !ieee80211_is_nullfunc(fc) &&
2246                      ieee80211_is_data(fc) && rx->key))
2247                 return -EACCES;
2248
2249         return 0;
2250 }
2251
2252 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2253 {
2254         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2255         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2256         __le16 fc = hdr->frame_control;
2257
2258         /*
2259          * Pass through unencrypted frames if the hardware has
2260          * decrypted them already.
2261          */
2262         if (status->flag & RX_FLAG_DECRYPTED)
2263                 return 0;
2264
2265         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2266                 if (unlikely(!ieee80211_has_protected(fc) &&
2267                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2268                              rx->key)) {
2269                         if (ieee80211_is_deauth(fc) ||
2270                             ieee80211_is_disassoc(fc))
2271                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2272                                                              rx->skb->data,
2273                                                              rx->skb->len);
2274                         return -EACCES;
2275                 }
2276                 /* BIP does not use Protected field, so need to check MMIE */
2277                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2278                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2279                         if (ieee80211_is_deauth(fc) ||
2280                             ieee80211_is_disassoc(fc))
2281                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2282                                                              rx->skb->data,
2283                                                              rx->skb->len);
2284                         return -EACCES;
2285                 }
2286                 /*
2287                  * When using MFP, Action frames are not allowed prior to
2288                  * having configured keys.
2289                  */
2290                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2291                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2292                         return -EACCES;
2293         }
2294
2295         return 0;
2296 }
2297
2298 static int
2299 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2300 {
2301         struct ieee80211_sub_if_data *sdata = rx->sdata;
2302         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2303         bool check_port_control = false;
2304         struct ethhdr *ehdr;
2305         int ret;
2306
2307         *port_control = false;
2308         if (ieee80211_has_a4(hdr->frame_control) &&
2309             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2310                 return -1;
2311
2312         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2313             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2314
2315                 if (!sdata->u.mgd.use_4addr)
2316                         return -1;
2317                 else
2318                         check_port_control = true;
2319         }
2320
2321         if (is_multicast_ether_addr(hdr->addr1) &&
2322             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2323                 return -1;
2324
2325         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2326         if (ret < 0)
2327                 return ret;
2328
2329         ehdr = (struct ethhdr *) rx->skb->data;
2330         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2331                 *port_control = true;
2332         else if (check_port_control)
2333                 return -1;
2334
2335         return 0;
2336 }
2337
2338 /*
2339  * requires that rx->skb is a frame with ethernet header
2340  */
2341 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2342 {
2343         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2344                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2345         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2346
2347         /*
2348          * Allow EAPOL frames to us/the PAE group address regardless
2349          * of whether the frame was encrypted or not.
2350          */
2351         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2352             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2353              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2354                 return true;
2355
2356         if (ieee80211_802_1x_port_control(rx) ||
2357             ieee80211_drop_unencrypted(rx, fc))
2358                 return false;
2359
2360         return true;
2361 }
2362
2363 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2364                                                  struct ieee80211_rx_data *rx)
2365 {
2366         struct ieee80211_sub_if_data *sdata = rx->sdata;
2367         struct net_device *dev = sdata->dev;
2368
2369         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2370                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2371                      sdata->control_port_over_nl80211)) {
2372                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2373                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2374
2375                 cfg80211_rx_control_port(dev, skb, noencrypt);
2376                 dev_kfree_skb(skb);
2377         } else {
2378                 /* deliver to local stack */
2379                 if (rx->napi)
2380                         napi_gro_receive(rx->napi, skb);
2381                 else
2382                         netif_receive_skb(skb);
2383         }
2384 }
2385
2386 /*
2387  * requires that rx->skb is a frame with ethernet header
2388  */
2389 static void
2390 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2391 {
2392         struct ieee80211_sub_if_data *sdata = rx->sdata;
2393         struct net_device *dev = sdata->dev;
2394         struct sk_buff *skb, *xmit_skb;
2395         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2396         struct sta_info *dsta;
2397
2398         skb = rx->skb;
2399         xmit_skb = NULL;
2400
2401         ieee80211_rx_stats(dev, skb->len);
2402
2403         if (rx->sta) {
2404                 /* The seqno index has the same property as needed
2405                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2406                  * for non-QoS-data frames. Here we know it's a data
2407                  * frame, so count MSDUs.
2408                  */
2409                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2410                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2411                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2412         }
2413
2414         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2415              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2416             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2417             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2418                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2419                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2420                         /*
2421                          * send multicast frames both to higher layers in
2422                          * local net stack and back to the wireless medium
2423                          */
2424                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2425                         if (!xmit_skb)
2426                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2427                                                     dev->name);
2428                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2429                         dsta = sta_info_get(sdata, skb->data);
2430                         if (dsta) {
2431                                 /*
2432                                  * The destination station is associated to
2433                                  * this AP (in this VLAN), so send the frame
2434                                  * directly to it and do not pass it to local
2435                                  * net stack.
2436                                  */
2437                                 xmit_skb = skb;
2438                                 skb = NULL;
2439                         }
2440                 }
2441         }
2442
2443 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2444         if (skb) {
2445                 /* 'align' will only take the values 0 or 2 here since all
2446                  * frames are required to be aligned to 2-byte boundaries
2447                  * when being passed to mac80211; the code here works just
2448                  * as well if that isn't true, but mac80211 assumes it can
2449                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2450                  */
2451                 int align;
2452
2453                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2454                 if (align) {
2455                         if (WARN_ON(skb_headroom(skb) < 3)) {
2456                                 dev_kfree_skb(skb);
2457                                 skb = NULL;
2458                         } else {
2459                                 u8 *data = skb->data;
2460                                 size_t len = skb_headlen(skb);
2461                                 skb->data -= align;
2462                                 memmove(skb->data, data, len);
2463                                 skb_set_tail_pointer(skb, len);
2464                         }
2465                 }
2466         }
2467 #endif
2468
2469         if (skb) {
2470                 skb->protocol = eth_type_trans(skb, dev);
2471                 memset(skb->cb, 0, sizeof(skb->cb));
2472
2473                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2474         }
2475
2476         if (xmit_skb) {
2477                 /*
2478                  * Send to wireless media and increase priority by 256 to
2479                  * keep the received priority instead of reclassifying
2480                  * the frame (see cfg80211_classify8021d).
2481                  */
2482                 xmit_skb->priority += 256;
2483                 xmit_skb->protocol = htons(ETH_P_802_3);
2484                 skb_reset_network_header(xmit_skb);
2485                 skb_reset_mac_header(xmit_skb);
2486                 dev_queue_xmit(xmit_skb);
2487         }
2488 }
2489
2490 static ieee80211_rx_result debug_noinline
2491 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2492 {
2493         struct net_device *dev = rx->sdata->dev;
2494         struct sk_buff *skb = rx->skb;
2495         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2496         __le16 fc = hdr->frame_control;
2497         struct sk_buff_head frame_list;
2498         struct ethhdr ethhdr;
2499         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2500
2501         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2502                 check_da = NULL;
2503                 check_sa = NULL;
2504         } else switch (rx->sdata->vif.type) {
2505                 case NL80211_IFTYPE_AP:
2506                 case NL80211_IFTYPE_AP_VLAN:
2507                         check_da = NULL;
2508                         break;
2509                 case NL80211_IFTYPE_STATION:
2510                         if (!rx->sta ||
2511                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2512                                 check_sa = NULL;
2513                         break;
2514                 case NL80211_IFTYPE_MESH_POINT:
2515                         check_sa = NULL;
2516                         break;
2517                 default:
2518                         break;
2519         }
2520
2521         skb->dev = dev;
2522         __skb_queue_head_init(&frame_list);
2523
2524         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2525                                           rx->sdata->vif.addr,
2526                                           rx->sdata->vif.type,
2527                                           data_offset))
2528                 return RX_DROP_UNUSABLE;
2529
2530         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2531                                  rx->sdata->vif.type,
2532                                  rx->local->hw.extra_tx_headroom,
2533                                  check_da, check_sa);
2534
2535         while (!skb_queue_empty(&frame_list)) {
2536                 rx->skb = __skb_dequeue(&frame_list);
2537
2538                 if (!ieee80211_frame_allowed(rx, fc)) {
2539                         dev_kfree_skb(rx->skb);
2540                         continue;
2541                 }
2542
2543                 ieee80211_deliver_skb(rx);
2544         }
2545
2546         return RX_QUEUED;
2547 }
2548
2549 static ieee80211_rx_result debug_noinline
2550 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2551 {
2552         struct sk_buff *skb = rx->skb;
2553         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2554         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2555         __le16 fc = hdr->frame_control;
2556
2557         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2558                 return RX_CONTINUE;
2559
2560         if (unlikely(!ieee80211_is_data(fc)))
2561                 return RX_CONTINUE;
2562
2563         if (unlikely(!ieee80211_is_data_present(fc)))
2564                 return RX_DROP_MONITOR;
2565
2566         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2567                 switch (rx->sdata->vif.type) {
2568                 case NL80211_IFTYPE_AP_VLAN:
2569                         if (!rx->sdata->u.vlan.sta)
2570                                 return RX_DROP_UNUSABLE;
2571                         break;
2572                 case NL80211_IFTYPE_STATION:
2573                         if (!rx->sdata->u.mgd.use_4addr)
2574                                 return RX_DROP_UNUSABLE;
2575                         break;
2576                 default:
2577                         return RX_DROP_UNUSABLE;
2578                 }
2579         }
2580
2581         if (is_multicast_ether_addr(hdr->addr1))
2582                 return RX_DROP_UNUSABLE;
2583
2584         return __ieee80211_rx_h_amsdu(rx, 0);
2585 }
2586
2587 #ifdef CONFIG_MAC80211_MESH
2588 static ieee80211_rx_result
2589 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2590 {
2591         struct ieee80211_hdr *fwd_hdr, *hdr;
2592         struct ieee80211_tx_info *info;
2593         struct ieee80211s_hdr *mesh_hdr;
2594         struct sk_buff *skb = rx->skb, *fwd_skb;
2595         struct ieee80211_local *local = rx->local;
2596         struct ieee80211_sub_if_data *sdata = rx->sdata;
2597         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2598         u16 ac, q, hdrlen;
2599
2600         hdr = (struct ieee80211_hdr *) skb->data;
2601         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2602
2603         /* make sure fixed part of mesh header is there, also checks skb len */
2604         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2605                 return RX_DROP_MONITOR;
2606
2607         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2608
2609         /* make sure full mesh header is there, also checks skb len */
2610         if (!pskb_may_pull(rx->skb,
2611                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2612                 return RX_DROP_MONITOR;
2613
2614         /* reload pointers */
2615         hdr = (struct ieee80211_hdr *) skb->data;
2616         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2617
2618         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2619                 return RX_DROP_MONITOR;
2620
2621         /* frame is in RMC, don't forward */
2622         if (ieee80211_is_data(hdr->frame_control) &&
2623             is_multicast_ether_addr(hdr->addr1) &&
2624             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2625                 return RX_DROP_MONITOR;
2626
2627         if (!ieee80211_is_data(hdr->frame_control))
2628                 return RX_CONTINUE;
2629
2630         if (!mesh_hdr->ttl)
2631                 return RX_DROP_MONITOR;
2632
2633         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2634                 struct mesh_path *mppath;
2635                 char *proxied_addr;
2636                 char *mpp_addr;
2637
2638                 if (is_multicast_ether_addr(hdr->addr1)) {
2639                         mpp_addr = hdr->addr3;
2640                         proxied_addr = mesh_hdr->eaddr1;
2641                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2642                             MESH_FLAGS_AE_A5_A6) {
2643                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2644                         mpp_addr = hdr->addr4;
2645                         proxied_addr = mesh_hdr->eaddr2;
2646                 } else {
2647                         return RX_DROP_MONITOR;
2648                 }
2649
2650                 rcu_read_lock();
2651                 mppath = mpp_path_lookup(sdata, proxied_addr);
2652                 if (!mppath) {
2653                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2654                 } else {
2655                         spin_lock_bh(&mppath->state_lock);
2656                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2657                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2658                         mppath->exp_time = jiffies;
2659                         spin_unlock_bh(&mppath->state_lock);
2660                 }
2661                 rcu_read_unlock();
2662         }
2663
2664         /* Frame has reached destination.  Don't forward */
2665         if (!is_multicast_ether_addr(hdr->addr1) &&
2666             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2667                 return RX_CONTINUE;
2668
2669         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2670         q = sdata->vif.hw_queue[ac];
2671         if (ieee80211_queue_stopped(&local->hw, q)) {
2672                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2673                 return RX_DROP_MONITOR;
2674         }
2675         skb_set_queue_mapping(skb, q);
2676
2677         if (!--mesh_hdr->ttl) {
2678                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2679                 goto out;
2680         }
2681
2682         if (!ifmsh->mshcfg.dot11MeshForwarding)
2683                 goto out;
2684
2685         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2686                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2687         if (!fwd_skb)
2688                 goto out;
2689
2690         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2691         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2692         info = IEEE80211_SKB_CB(fwd_skb);
2693         memset(info, 0, sizeof(*info));
2694         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2695         info->control.vif = &rx->sdata->vif;
2696         info->control.jiffies = jiffies;
2697         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2698                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2699                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2700                 /* update power mode indication when forwarding */
2701                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2702         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2703                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2704                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2705         } else {
2706                 /* unable to resolve next hop */
2707                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2708                                    fwd_hdr->addr3, 0,
2709                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2710                                    fwd_hdr->addr2);
2711                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2712                 kfree_skb(fwd_skb);
2713                 return RX_DROP_MONITOR;
2714         }
2715
2716         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2717         ieee80211_add_pending_skb(local, fwd_skb);
2718  out:
2719         if (is_multicast_ether_addr(hdr->addr1))
2720                 return RX_CONTINUE;
2721         return RX_DROP_MONITOR;
2722 }
2723 #endif
2724
2725 static ieee80211_rx_result debug_noinline
2726 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2727 {
2728         struct ieee80211_sub_if_data *sdata = rx->sdata;
2729         struct ieee80211_local *local = rx->local;
2730         struct net_device *dev = sdata->dev;
2731         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2732         __le16 fc = hdr->frame_control;
2733         bool port_control;
2734         int err;
2735
2736         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2737                 return RX_CONTINUE;
2738
2739         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2740                 return RX_DROP_MONITOR;
2741
2742         /*
2743          * Send unexpected-4addr-frame event to hostapd. For older versions,
2744          * also drop the frame to cooked monitor interfaces.
2745          */
2746         if (ieee80211_has_a4(hdr->frame_control) &&
2747             sdata->vif.type == NL80211_IFTYPE_AP) {
2748                 if (rx->sta &&
2749                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2750                         cfg80211_rx_unexpected_4addr_frame(
2751                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2752                 return RX_DROP_MONITOR;
2753         }
2754
2755         err = __ieee80211_data_to_8023(rx, &port_control);
2756         if (unlikely(err))
2757                 return RX_DROP_UNUSABLE;
2758
2759         if (!ieee80211_frame_allowed(rx, fc))
2760                 return RX_DROP_MONITOR;
2761
2762         /* directly handle TDLS channel switch requests/responses */
2763         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2764                                                 cpu_to_be16(ETH_P_TDLS))) {
2765                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2766
2767                 if (pskb_may_pull(rx->skb,
2768                                   offsetof(struct ieee80211_tdls_data, u)) &&
2769                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2770                     tf->category == WLAN_CATEGORY_TDLS &&
2771                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2772                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2773                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2774                         schedule_work(&local->tdls_chsw_work);
2775                         if (rx->sta)
2776                                 rx->sta->rx_stats.packets++;
2777
2778                         return RX_QUEUED;
2779                 }
2780         }
2781
2782         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2783             unlikely(port_control) && sdata->bss) {
2784                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2785                                      u.ap);
2786                 dev = sdata->dev;
2787                 rx->sdata = sdata;
2788         }
2789
2790         rx->skb->dev = dev;
2791
2792         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2793             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2794             !is_multicast_ether_addr(
2795                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2796             (!local->scanning &&
2797              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2798                 mod_timer(&local->dynamic_ps_timer, jiffies +
2799                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2800
2801         ieee80211_deliver_skb(rx);
2802
2803         return RX_QUEUED;
2804 }
2805
2806 static ieee80211_rx_result debug_noinline
2807 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2808 {
2809         struct sk_buff *skb = rx->skb;
2810         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2811         struct tid_ampdu_rx *tid_agg_rx;
2812         u16 start_seq_num;
2813         u16 tid;
2814
2815         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2816                 return RX_CONTINUE;
2817
2818         if (ieee80211_is_back_req(bar->frame_control)) {
2819                 struct {
2820                         __le16 control, start_seq_num;
2821                 } __packed bar_data;
2822                 struct ieee80211_event event = {
2823                         .type = BAR_RX_EVENT,
2824                 };
2825
2826                 if (!rx->sta)
2827                         return RX_DROP_MONITOR;
2828
2829                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2830                                   &bar_data, sizeof(bar_data)))
2831                         return RX_DROP_MONITOR;
2832
2833                 tid = le16_to_cpu(bar_data.control) >> 12;
2834
2835                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2836                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2837                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2838                                              WLAN_BACK_RECIPIENT,
2839                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2840
2841                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2842                 if (!tid_agg_rx)
2843                         return RX_DROP_MONITOR;
2844
2845                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2846                 event.u.ba.tid = tid;
2847                 event.u.ba.ssn = start_seq_num;
2848                 event.u.ba.sta = &rx->sta->sta;
2849
2850                 /* reset session timer */
2851                 if (tid_agg_rx->timeout)
2852                         mod_timer(&tid_agg_rx->session_timer,
2853                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2854
2855                 spin_lock(&tid_agg_rx->reorder_lock);
2856                 /* release stored frames up to start of BAR */
2857                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2858                                                  start_seq_num, frames);
2859                 spin_unlock(&tid_agg_rx->reorder_lock);
2860
2861                 drv_event_callback(rx->local, rx->sdata, &event);
2862
2863                 kfree_skb(skb);
2864                 return RX_QUEUED;
2865         }
2866
2867         /*
2868          * After this point, we only want management frames,
2869          * so we can drop all remaining control frames to
2870          * cooked monitor interfaces.
2871          */
2872         return RX_DROP_MONITOR;
2873 }
2874
2875 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2876                                            struct ieee80211_mgmt *mgmt,
2877                                            size_t len)
2878 {
2879         struct ieee80211_local *local = sdata->local;
2880         struct sk_buff *skb;
2881         struct ieee80211_mgmt *resp;
2882
2883         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2884                 /* Not to own unicast address */
2885                 return;
2886         }
2887
2888         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2889             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2890                 /* Not from the current AP or not associated yet. */
2891                 return;
2892         }
2893
2894         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2895                 /* Too short SA Query request frame */
2896                 return;
2897         }
2898
2899         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2900         if (skb == NULL)
2901                 return;
2902
2903         skb_reserve(skb, local->hw.extra_tx_headroom);
2904         resp = skb_put_zero(skb, 24);
2905         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2906         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2907         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2908         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2909                                           IEEE80211_STYPE_ACTION);
2910         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2911         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2912         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2913         memcpy(resp->u.action.u.sa_query.trans_id,
2914                mgmt->u.action.u.sa_query.trans_id,
2915                WLAN_SA_QUERY_TR_ID_LEN);
2916
2917         ieee80211_tx_skb(sdata, skb);
2918 }
2919
2920 static ieee80211_rx_result debug_noinline
2921 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2922 {
2923         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2924         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2925
2926         /*
2927          * From here on, look only at management frames.
2928          * Data and control frames are already handled,
2929          * and unknown (reserved) frames are useless.
2930          */
2931         if (rx->skb->len < 24)
2932                 return RX_DROP_MONITOR;
2933
2934         if (!ieee80211_is_mgmt(mgmt->frame_control))
2935                 return RX_DROP_MONITOR;
2936
2937         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2938             ieee80211_is_beacon(mgmt->frame_control) &&
2939             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2940                 int sig = 0;
2941
2942                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2943                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2944                         sig = status->signal;
2945
2946                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2947                                             rx->skb->data, rx->skb->len,
2948                                             status->freq, sig);
2949                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2950         }
2951
2952         if (ieee80211_drop_unencrypted_mgmt(rx))
2953                 return RX_DROP_UNUSABLE;
2954
2955         return RX_CONTINUE;
2956 }
2957
2958 static ieee80211_rx_result debug_noinline
2959 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2960 {
2961         struct ieee80211_local *local = rx->local;
2962         struct ieee80211_sub_if_data *sdata = rx->sdata;
2963         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2964         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2965         int len = rx->skb->len;
2966
2967         if (!ieee80211_is_action(mgmt->frame_control))
2968                 return RX_CONTINUE;
2969
2970         /* drop too small frames */
2971         if (len < IEEE80211_MIN_ACTION_SIZE)
2972                 return RX_DROP_UNUSABLE;
2973
2974         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2975             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2976             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2977                 return RX_DROP_UNUSABLE;
2978
2979         switch (mgmt->u.action.category) {
2980         case WLAN_CATEGORY_HT:
2981                 /* reject HT action frames from stations not supporting HT */
2982                 if (!rx->sta->sta.ht_cap.ht_supported)
2983                         goto invalid;
2984
2985                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2986                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2987                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2988                     sdata->vif.type != NL80211_IFTYPE_AP &&
2989                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2990                         break;
2991
2992                 /* verify action & smps_control/chanwidth are present */
2993                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2994                         goto invalid;
2995
2996                 switch (mgmt->u.action.u.ht_smps.action) {
2997                 case WLAN_HT_ACTION_SMPS: {
2998                         struct ieee80211_supported_band *sband;
2999                         enum ieee80211_smps_mode smps_mode;
3000                         struct sta_opmode_info sta_opmode = {};
3001
3002                         /* convert to HT capability */
3003                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3004                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3005                                 smps_mode = IEEE80211_SMPS_OFF;
3006                                 break;
3007                         case WLAN_HT_SMPS_CONTROL_STATIC:
3008                                 smps_mode = IEEE80211_SMPS_STATIC;
3009                                 break;
3010                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3011                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3012                                 break;
3013                         default:
3014                                 goto invalid;
3015                         }
3016
3017                         /* if no change do nothing */
3018                         if (rx->sta->sta.smps_mode == smps_mode)
3019                                 goto handled;
3020                         rx->sta->sta.smps_mode = smps_mode;
3021                         sta_opmode.smps_mode =
3022                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3023                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3024
3025                         sband = rx->local->hw.wiphy->bands[status->band];
3026
3027                         rate_control_rate_update(local, sband, rx->sta,
3028                                                  IEEE80211_RC_SMPS_CHANGED);
3029                         cfg80211_sta_opmode_change_notify(sdata->dev,
3030                                                           rx->sta->addr,
3031                                                           &sta_opmode,
3032                                                           GFP_KERNEL);
3033                         goto handled;
3034                 }
3035                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3036                         struct ieee80211_supported_band *sband;
3037                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3038                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3039                         struct sta_opmode_info sta_opmode = {};
3040
3041                         /* If it doesn't support 40 MHz it can't change ... */
3042                         if (!(rx->sta->sta.ht_cap.cap &
3043                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3044                                 goto handled;
3045
3046                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3047                                 max_bw = IEEE80211_STA_RX_BW_20;
3048                         else
3049                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3050
3051                         /* set cur_max_bandwidth and recalc sta bw */
3052                         rx->sta->cur_max_bandwidth = max_bw;
3053                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3054
3055                         if (rx->sta->sta.bandwidth == new_bw)
3056                                 goto handled;
3057
3058                         rx->sta->sta.bandwidth = new_bw;
3059                         sband = rx->local->hw.wiphy->bands[status->band];
3060                         sta_opmode.bw =
3061                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3062                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3063
3064                         rate_control_rate_update(local, sband, rx->sta,
3065                                                  IEEE80211_RC_BW_CHANGED);
3066                         cfg80211_sta_opmode_change_notify(sdata->dev,
3067                                                           rx->sta->addr,
3068                                                           &sta_opmode,
3069                                                           GFP_KERNEL);
3070                         goto handled;
3071                 }
3072                 default:
3073                         goto invalid;
3074                 }
3075
3076                 break;
3077         case WLAN_CATEGORY_PUBLIC:
3078                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3079                         goto invalid;
3080                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3081                         break;
3082                 if (!rx->sta)
3083                         break;
3084                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3085                         break;
3086                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3087                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3088                         break;
3089                 if (len < offsetof(struct ieee80211_mgmt,
3090                                    u.action.u.ext_chan_switch.variable))
3091                         goto invalid;
3092                 goto queue;
3093         case WLAN_CATEGORY_VHT:
3094                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3095                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3096                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3097                     sdata->vif.type != NL80211_IFTYPE_AP &&
3098                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3099                         break;
3100
3101                 /* verify action code is present */
3102                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3103                         goto invalid;
3104
3105                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3106                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3107                         /* verify opmode is present */
3108                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3109                                 goto invalid;
3110                         goto queue;
3111                 }
3112                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3113                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3114                                 goto invalid;
3115                         goto queue;
3116                 }
3117                 default:
3118                         break;
3119                 }
3120                 break;
3121         case WLAN_CATEGORY_BACK:
3122                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3123                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3124                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3125                     sdata->vif.type != NL80211_IFTYPE_AP &&
3126                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3127                         break;
3128
3129                 /* verify action_code is present */
3130                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3131                         break;
3132
3133                 switch (mgmt->u.action.u.addba_req.action_code) {
3134                 case WLAN_ACTION_ADDBA_REQ:
3135                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3136                                    sizeof(mgmt->u.action.u.addba_req)))
3137                                 goto invalid;
3138                         break;
3139                 case WLAN_ACTION_ADDBA_RESP:
3140                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3141                                    sizeof(mgmt->u.action.u.addba_resp)))
3142                                 goto invalid;
3143                         break;
3144                 case WLAN_ACTION_DELBA:
3145                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3146                                    sizeof(mgmt->u.action.u.delba)))
3147                                 goto invalid;
3148                         break;
3149                 default:
3150                         goto invalid;
3151                 }
3152
3153                 goto queue;
3154         case WLAN_CATEGORY_SPECTRUM_MGMT:
3155                 /* verify action_code is present */
3156                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3157                         break;
3158
3159                 switch (mgmt->u.action.u.measurement.action_code) {
3160                 case WLAN_ACTION_SPCT_MSR_REQ:
3161                         if (status->band != NL80211_BAND_5GHZ)
3162                                 break;
3163
3164                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3165                                    sizeof(mgmt->u.action.u.measurement)))
3166                                 break;
3167
3168                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3169                                 break;
3170
3171                         ieee80211_process_measurement_req(sdata, mgmt, len);
3172                         goto handled;
3173                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3174                         u8 *bssid;
3175                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3176                                    sizeof(mgmt->u.action.u.chan_switch)))
3177                                 break;
3178
3179                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3180                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3181                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3182                                 break;
3183
3184                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3185                                 bssid = sdata->u.mgd.bssid;
3186                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3187                                 bssid = sdata->u.ibss.bssid;
3188                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3189                                 bssid = mgmt->sa;
3190                         else
3191                                 break;
3192
3193                         if (!ether_addr_equal(mgmt->bssid, bssid))
3194                                 break;
3195
3196                         goto queue;
3197                         }
3198                 }
3199                 break;
3200         case WLAN_CATEGORY_SA_QUERY:
3201                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3202                            sizeof(mgmt->u.action.u.sa_query)))
3203                         break;
3204
3205                 switch (mgmt->u.action.u.sa_query.action) {
3206                 case WLAN_ACTION_SA_QUERY_REQUEST:
3207                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3208                                 break;
3209                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3210                         goto handled;
3211                 }
3212                 break;
3213         case WLAN_CATEGORY_SELF_PROTECTED:
3214                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3215                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3216                         break;
3217
3218                 switch (mgmt->u.action.u.self_prot.action_code) {
3219                 case WLAN_SP_MESH_PEERING_OPEN:
3220                 case WLAN_SP_MESH_PEERING_CLOSE:
3221                 case WLAN_SP_MESH_PEERING_CONFIRM:
3222                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3223                                 goto invalid;
3224                         if (sdata->u.mesh.user_mpm)
3225                                 /* userspace handles this frame */
3226                                 break;
3227                         goto queue;
3228                 case WLAN_SP_MGK_INFORM:
3229                 case WLAN_SP_MGK_ACK:
3230                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3231                                 goto invalid;
3232                         break;
3233                 }
3234                 break;
3235         case WLAN_CATEGORY_MESH_ACTION:
3236                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3237                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3238                         break;
3239
3240                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3241                         break;
3242                 if (mesh_action_is_path_sel(mgmt) &&
3243                     !mesh_path_sel_is_hwmp(sdata))
3244                         break;
3245                 goto queue;
3246         }
3247
3248         return RX_CONTINUE;
3249
3250  invalid:
3251         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3252         /* will return in the next handlers */
3253         return RX_CONTINUE;
3254
3255  handled:
3256         if (rx->sta)
3257                 rx->sta->rx_stats.packets++;
3258         dev_kfree_skb(rx->skb);
3259         return RX_QUEUED;
3260
3261  queue:
3262         skb_queue_tail(&sdata->skb_queue, rx->skb);
3263         ieee80211_queue_work(&local->hw, &sdata->work);
3264         if (rx->sta)
3265                 rx->sta->rx_stats.packets++;
3266         return RX_QUEUED;
3267 }
3268
3269 static ieee80211_rx_result debug_noinline
3270 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3271 {
3272         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3273         int sig = 0;
3274
3275         /* skip known-bad action frames and return them in the next handler */
3276         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3277                 return RX_CONTINUE;
3278
3279         /*
3280          * Getting here means the kernel doesn't know how to handle
3281          * it, but maybe userspace does ... include returned frames
3282          * so userspace can register for those to know whether ones
3283          * it transmitted were processed or returned.
3284          */
3285
3286         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3287             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3288                 sig = status->signal;
3289
3290         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3291                              rx->skb->data, rx->skb->len, 0)) {
3292                 if (rx->sta)
3293                         rx->sta->rx_stats.packets++;
3294                 dev_kfree_skb(rx->skb);
3295                 return RX_QUEUED;
3296         }
3297
3298         return RX_CONTINUE;
3299 }
3300
3301 static ieee80211_rx_result debug_noinline
3302 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3303 {
3304         struct ieee80211_local *local = rx->local;
3305         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3306         struct sk_buff *nskb;
3307         struct ieee80211_sub_if_data *sdata = rx->sdata;
3308         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3309
3310         if (!ieee80211_is_action(mgmt->frame_control))
3311                 return RX_CONTINUE;
3312
3313         /*
3314          * For AP mode, hostapd is responsible for handling any action
3315          * frames that we didn't handle, including returning unknown
3316          * ones. For all other modes we will return them to the sender,
3317          * setting the 0x80 bit in the action category, as required by
3318          * 802.11-2012 9.24.4.
3319          * Newer versions of hostapd shall also use the management frame
3320          * registration mechanisms, but older ones still use cooked
3321          * monitor interfaces so push all frames there.
3322          */
3323         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3324             (sdata->vif.type == NL80211_IFTYPE_AP ||
3325              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3326                 return RX_DROP_MONITOR;
3327
3328         if (is_multicast_ether_addr(mgmt->da))
3329                 return RX_DROP_MONITOR;
3330
3331         /* do not return rejected action frames */
3332         if (mgmt->u.action.category & 0x80)
3333                 return RX_DROP_UNUSABLE;
3334
3335         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3336                                GFP_ATOMIC);
3337         if (nskb) {
3338                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3339
3340                 nmgmt->u.action.category |= 0x80;
3341                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3342                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3343
3344                 memset(nskb->cb, 0, sizeof(nskb->cb));
3345
3346                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3347                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3348
3349                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3350                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3351                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3352                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3353                                 info->hw_queue =
3354                                         local->hw.offchannel_tx_hw_queue;
3355                 }
3356
3357                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3358                                             status->band, 0);
3359         }
3360         dev_kfree_skb(rx->skb);
3361         return RX_QUEUED;
3362 }
3363
3364 static ieee80211_rx_result debug_noinline
3365 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3366 {
3367         struct ieee80211_sub_if_data *sdata = rx->sdata;
3368         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3369         __le16 stype;
3370
3371         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3372
3373         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3374             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3375             sdata->vif.type != NL80211_IFTYPE_OCB &&
3376             sdata->vif.type != NL80211_IFTYPE_STATION)
3377                 return RX_DROP_MONITOR;
3378
3379         switch (stype) {
3380         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3381         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3382         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3383                 /* process for all: mesh, mlme, ibss */
3384                 break;
3385         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3386         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3387         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3388         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3389                 if (is_multicast_ether_addr(mgmt->da) &&
3390                     !is_broadcast_ether_addr(mgmt->da))
3391                         return RX_DROP_MONITOR;
3392
3393                 /* process only for station */
3394                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3395                         return RX_DROP_MONITOR;
3396                 break;
3397         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3398                 /* process only for ibss and mesh */
3399                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3400                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3401                         return RX_DROP_MONITOR;
3402                 break;
3403         default:
3404                 return RX_DROP_MONITOR;
3405         }
3406
3407         /* queue up frame and kick off work to process it */
3408         skb_queue_tail(&sdata->skb_queue, rx->skb);
3409         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3410         if (rx->sta)
3411                 rx->sta->rx_stats.packets++;
3412
3413         return RX_QUEUED;
3414 }
3415
3416 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3417                                         struct ieee80211_rate *rate)
3418 {
3419         struct ieee80211_sub_if_data *sdata;
3420         struct ieee80211_local *local = rx->local;
3421         struct sk_buff *skb = rx->skb, *skb2;
3422         struct net_device *prev_dev = NULL;
3423         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3424         int needed_headroom;
3425
3426         /*
3427          * If cooked monitor has been processed already, then
3428          * don't do it again. If not, set the flag.
3429          */
3430         if (rx->flags & IEEE80211_RX_CMNTR)
3431                 goto out_free_skb;
3432         rx->flags |= IEEE80211_RX_CMNTR;
3433
3434         /* If there are no cooked monitor interfaces, just free the SKB */
3435         if (!local->cooked_mntrs)
3436                 goto out_free_skb;
3437
3438         /* vendor data is long removed here */
3439         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3440         /* room for the radiotap header based on driver features */
3441         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3442
3443         if (skb_headroom(skb) < needed_headroom &&
3444             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3445                 goto out_free_skb;
3446
3447         /* prepend radiotap information */
3448         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3449                                          false);
3450
3451         skb_reset_mac_header(skb);
3452         skb->ip_summed = CHECKSUM_UNNECESSARY;
3453         skb->pkt_type = PACKET_OTHERHOST;
3454         skb->protocol = htons(ETH_P_802_2);
3455
3456         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3457                 if (!ieee80211_sdata_running(sdata))
3458                         continue;
3459
3460                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3461                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3462                         continue;
3463
3464                 if (prev_dev) {
3465                         skb2 = skb_clone(skb, GFP_ATOMIC);
3466                         if (skb2) {
3467                                 skb2->dev = prev_dev;
3468                                 netif_receive_skb(skb2);
3469                         }
3470                 }
3471
3472                 prev_dev = sdata->dev;
3473                 ieee80211_rx_stats(sdata->dev, skb->len);
3474         }
3475
3476         if (prev_dev) {
3477                 skb->dev = prev_dev;
3478                 netif_receive_skb(skb);
3479                 return;
3480         }
3481
3482  out_free_skb:
3483         dev_kfree_skb(skb);
3484 }
3485
3486 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3487                                          ieee80211_rx_result res)
3488 {
3489         switch (res) {
3490         case RX_DROP_MONITOR:
3491                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3492                 if (rx->sta)
3493                         rx->sta->rx_stats.dropped++;
3494                 /* fall through */
3495         case RX_CONTINUE: {
3496                 struct ieee80211_rate *rate = NULL;
3497                 struct ieee80211_supported_band *sband;
3498                 struct ieee80211_rx_status *status;
3499
3500                 status = IEEE80211_SKB_RXCB((rx->skb));
3501
3502                 sband = rx->local->hw.wiphy->bands[status->band];
3503                 if (status->encoding == RX_ENC_LEGACY)
3504                         rate = &sband->bitrates[status->rate_idx];
3505
3506                 ieee80211_rx_cooked_monitor(rx, rate);
3507                 break;
3508                 }
3509         case RX_DROP_UNUSABLE:
3510                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3511                 if (rx->sta)
3512                         rx->sta->rx_stats.dropped++;
3513                 dev_kfree_skb(rx->skb);
3514                 break;
3515         case RX_QUEUED:
3516                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3517                 break;
3518         }
3519 }
3520
3521 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3522                                   struct sk_buff_head *frames)
3523 {
3524         ieee80211_rx_result res = RX_DROP_MONITOR;
3525         struct sk_buff *skb;
3526
3527 #define CALL_RXH(rxh)                   \
3528         do {                            \
3529                 res = rxh(rx);          \
3530                 if (res != RX_CONTINUE) \
3531                         goto rxh_next;  \
3532         } while (0)
3533
3534         /* Lock here to avoid hitting all of the data used in the RX
3535          * path (e.g. key data, station data, ...) concurrently when
3536          * a frame is released from the reorder buffer due to timeout
3537          * from the timer, potentially concurrently with RX from the
3538          * driver.
3539          */
3540         spin_lock_bh(&rx->local->rx_path_lock);
3541
3542         while ((skb = __skb_dequeue(frames))) {
3543                 /*
3544                  * all the other fields are valid across frames
3545                  * that belong to an aMPDU since they are on the
3546                  * same TID from the same station
3547                  */
3548                 rx->skb = skb;
3549
3550                 CALL_RXH(ieee80211_rx_h_check_more_data);
3551                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3552                 CALL_RXH(ieee80211_rx_h_sta_process);
3553                 CALL_RXH(ieee80211_rx_h_decrypt);
3554                 CALL_RXH(ieee80211_rx_h_defragment);
3555                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3556                 /* must be after MMIC verify so header is counted in MPDU mic */
3557 #ifdef CONFIG_MAC80211_MESH
3558                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3559                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3560 #endif
3561                 CALL_RXH(ieee80211_rx_h_amsdu);
3562                 CALL_RXH(ieee80211_rx_h_data);
3563
3564                 /* special treatment -- needs the queue */
3565                 res = ieee80211_rx_h_ctrl(rx, frames);
3566                 if (res != RX_CONTINUE)
3567                         goto rxh_next;
3568
3569                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3570                 CALL_RXH(ieee80211_rx_h_action);
3571                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3572                 CALL_RXH(ieee80211_rx_h_action_return);
3573                 CALL_RXH(ieee80211_rx_h_mgmt);
3574
3575  rxh_next:
3576                 ieee80211_rx_handlers_result(rx, res);
3577
3578 #undef CALL_RXH
3579         }
3580
3581         spin_unlock_bh(&rx->local->rx_path_lock);
3582 }
3583
3584 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3585 {
3586         struct sk_buff_head reorder_release;
3587         ieee80211_rx_result res = RX_DROP_MONITOR;
3588
3589         __skb_queue_head_init(&reorder_release);
3590
3591 #define CALL_RXH(rxh)                   \
3592         do {                            \
3593                 res = rxh(rx);          \
3594                 if (res != RX_CONTINUE) \
3595                         goto rxh_next;  \
3596         } while (0)
3597
3598         CALL_RXH(ieee80211_rx_h_check_dup);
3599         CALL_RXH(ieee80211_rx_h_check);
3600
3601         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3602
3603         ieee80211_rx_handlers(rx, &reorder_release);
3604         return;
3605
3606  rxh_next:
3607         ieee80211_rx_handlers_result(rx, res);
3608
3609 #undef CALL_RXH
3610 }
3611
3612 /*
3613  * This function makes calls into the RX path, therefore
3614  * it has to be invoked under RCU read lock.
3615  */
3616 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3617 {
3618         struct sk_buff_head frames;
3619         struct ieee80211_rx_data rx = {
3620                 .sta = sta,
3621                 .sdata = sta->sdata,
3622                 .local = sta->local,
3623                 /* This is OK -- must be QoS data frame */
3624                 .security_idx = tid,
3625                 .seqno_idx = tid,
3626                 .napi = NULL, /* must be NULL to not have races */
3627         };
3628         struct tid_ampdu_rx *tid_agg_rx;
3629
3630         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3631         if (!tid_agg_rx)
3632                 return;
3633
3634         __skb_queue_head_init(&frames);
3635
3636         spin_lock(&tid_agg_rx->reorder_lock);
3637         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3638         spin_unlock(&tid_agg_rx->reorder_lock);
3639
3640         if (!skb_queue_empty(&frames)) {
3641                 struct ieee80211_event event = {
3642                         .type = BA_FRAME_TIMEOUT,
3643                         .u.ba.tid = tid,
3644                         .u.ba.sta = &sta->sta,
3645                 };
3646                 drv_event_callback(rx.local, rx.sdata, &event);
3647         }
3648
3649         ieee80211_rx_handlers(&rx, &frames);
3650 }
3651
3652 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3653                                           u16 ssn, u64 filtered,
3654                                           u16 received_mpdus)
3655 {
3656         struct sta_info *sta;
3657         struct tid_ampdu_rx *tid_agg_rx;
3658         struct sk_buff_head frames;
3659         struct ieee80211_rx_data rx = {
3660                 /* This is OK -- must be QoS data frame */
3661                 .security_idx = tid,
3662                 .seqno_idx = tid,
3663         };
3664         int i, diff;
3665
3666         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3667                 return;
3668
3669         __skb_queue_head_init(&frames);
3670
3671         sta = container_of(pubsta, struct sta_info, sta);
3672
3673         rx.sta = sta;
3674         rx.sdata = sta->sdata;
3675         rx.local = sta->local;
3676
3677         rcu_read_lock();
3678         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3679         if (!tid_agg_rx)
3680                 goto out;
3681
3682         spin_lock_bh(&tid_agg_rx->reorder_lock);
3683
3684         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3685                 int release;
3686
3687                 /* release all frames in the reorder buffer */
3688                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3689                            IEEE80211_SN_MODULO;
3690                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3691                                                  release, &frames);
3692                 /* update ssn to match received ssn */
3693                 tid_agg_rx->head_seq_num = ssn;
3694         } else {
3695                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3696                                                  &frames);
3697         }
3698
3699         /* handle the case that received ssn is behind the mac ssn.
3700          * it can be tid_agg_rx->buf_size behind and still be valid */
3701         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3702         if (diff >= tid_agg_rx->buf_size) {
3703                 tid_agg_rx->reorder_buf_filtered = 0;
3704                 goto release;
3705         }
3706         filtered = filtered >> diff;
3707         ssn += diff;
3708
3709         /* update bitmap */
3710         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3711                 int index = (ssn + i) % tid_agg_rx->buf_size;
3712
3713                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3714                 if (filtered & BIT_ULL(i))
3715                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3716         }
3717
3718         /* now process also frames that the filter marking released */
3719         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3720
3721 release:
3722         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3723
3724         ieee80211_rx_handlers(&rx, &frames);
3725
3726  out:
3727         rcu_read_unlock();
3728 }
3729 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3730
3731 /* main receive path */
3732
3733 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3734 {
3735         struct ieee80211_sub_if_data *sdata = rx->sdata;
3736         struct sk_buff *skb = rx->skb;
3737         struct ieee80211_hdr *hdr = (void *)skb->data;
3738         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3739         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3740         bool multicast = is_multicast_ether_addr(hdr->addr1);
3741
3742         switch (sdata->vif.type) {
3743         case NL80211_IFTYPE_STATION:
3744                 if (!bssid && !sdata->u.mgd.use_4addr)
3745                         return false;
3746                 if (multicast)
3747                         return true;
3748                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3749         case NL80211_IFTYPE_ADHOC:
3750                 if (!bssid)
3751                         return false;
3752                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3753                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3754                         return false;
3755                 if (ieee80211_is_beacon(hdr->frame_control))
3756                         return true;
3757                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3758                         return false;
3759                 if (!multicast &&
3760                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3761                         return false;
3762                 if (!rx->sta) {
3763                         int rate_idx;
3764                         if (status->encoding != RX_ENC_LEGACY)
3765                                 rate_idx = 0; /* TODO: HT/VHT rates */
3766                         else
3767                                 rate_idx = status->rate_idx;
3768                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3769                                                  BIT(rate_idx));
3770                 }
3771                 return true;
3772         case NL80211_IFTYPE_OCB:
3773                 if (!bssid)
3774                         return false;
3775                 if (!ieee80211_is_data_present(hdr->frame_control))
3776                         return false;
3777                 if (!is_broadcast_ether_addr(bssid))
3778                         return false;
3779                 if (!multicast &&
3780                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3781                         return false;
3782                 if (!rx->sta) {
3783                         int rate_idx;
3784                         if (status->encoding != RX_ENC_LEGACY)
3785                                 rate_idx = 0; /* TODO: HT rates */
3786                         else
3787                                 rate_idx = status->rate_idx;
3788                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3789                                                 BIT(rate_idx));
3790                 }
3791                 return true;
3792         case NL80211_IFTYPE_MESH_POINT:
3793                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3794                         return false;
3795                 if (multicast)
3796                         return true;
3797                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3798         case NL80211_IFTYPE_AP_VLAN:
3799         case NL80211_IFTYPE_AP:
3800                 if (!bssid)
3801                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3802
3803                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3804                         /*
3805                          * Accept public action frames even when the
3806                          * BSSID doesn't match, this is used for P2P
3807                          * and location updates. Note that mac80211
3808                          * itself never looks at these frames.
3809                          */
3810                         if (!multicast &&
3811                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3812                                 return false;
3813                         if (ieee80211_is_public_action(hdr, skb->len))
3814                                 return true;
3815                         return ieee80211_is_beacon(hdr->frame_control);
3816                 }
3817
3818                 if (!ieee80211_has_tods(hdr->frame_control)) {
3819                         /* ignore data frames to TDLS-peers */
3820                         if (ieee80211_is_data(hdr->frame_control))
3821                                 return false;
3822                         /* ignore action frames to TDLS-peers */
3823                         if (ieee80211_is_action(hdr->frame_control) &&
3824                             !is_broadcast_ether_addr(bssid) &&
3825                             !ether_addr_equal(bssid, hdr->addr1))
3826                                 return false;
3827                 }
3828
3829                 /*
3830                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3831                  * the BSSID - we've checked that already but may have accepted
3832                  * the wildcard (ff:ff:ff:ff:ff:ff).
3833                  *
3834                  * It also says:
3835                  *      The BSSID of the Data frame is determined as follows:
3836                  *      a) If the STA is contained within an AP or is associated
3837                  *         with an AP, the BSSID is the address currently in use
3838                  *         by the STA contained in the AP.
3839                  *
3840                  * So we should not accept data frames with an address that's
3841                  * multicast.
3842                  *
3843                  * Accepting it also opens a security problem because stations
3844                  * could encrypt it with the GTK and inject traffic that way.
3845                  */
3846                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3847                         return false;
3848
3849                 return true;
3850         case NL80211_IFTYPE_WDS:
3851                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3852                         return false;
3853                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3854         case NL80211_IFTYPE_P2P_DEVICE:
3855                 return ieee80211_is_public_action(hdr, skb->len) ||
3856                        ieee80211_is_probe_req(hdr->frame_control) ||
3857                        ieee80211_is_probe_resp(hdr->frame_control) ||
3858                        ieee80211_is_beacon(hdr->frame_control);
3859         case NL80211_IFTYPE_NAN:
3860                 /* Currently no frames on NAN interface are allowed */
3861                 return false;
3862         default:
3863                 break;
3864         }
3865
3866         WARN_ON_ONCE(1);
3867         return false;
3868 }
3869
3870 void ieee80211_check_fast_rx(struct sta_info *sta)
3871 {
3872         struct ieee80211_sub_if_data *sdata = sta->sdata;
3873         struct ieee80211_local *local = sdata->local;
3874         struct ieee80211_key *key;
3875         struct ieee80211_fast_rx fastrx = {
3876                 .dev = sdata->dev,
3877                 .vif_type = sdata->vif.type,
3878                 .control_port_protocol = sdata->control_port_protocol,
3879         }, *old, *new = NULL;
3880         bool assign = false;
3881
3882         /* use sparse to check that we don't return without updating */
3883         __acquire(check_fast_rx);
3884
3885         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3886         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3887         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3888         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3889
3890         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3891
3892         /* fast-rx doesn't do reordering */
3893         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3894             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3895                 goto clear;
3896
3897         switch (sdata->vif.type) {
3898         case NL80211_IFTYPE_STATION:
3899                 if (sta->sta.tdls) {
3900                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3901                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3902                         fastrx.expected_ds_bits = 0;
3903                 } else {
3904                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3905                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3906                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3907                         fastrx.expected_ds_bits =
3908                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3909                 }
3910
3911                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3912                         fastrx.expected_ds_bits |=
3913                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3914                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3915                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3916                 }
3917
3918                 if (!sdata->u.mgd.powersave)
3919                         break;
3920
3921                 /* software powersave is a huge mess, avoid all of it */
3922                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3923                         goto clear;
3924                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3925                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3926                         goto clear;
3927                 break;
3928         case NL80211_IFTYPE_AP_VLAN:
3929         case NL80211_IFTYPE_AP:
3930                 /* parallel-rx requires this, at least with calls to
3931                  * ieee80211_sta_ps_transition()
3932                  */
3933                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3934                         goto clear;
3935                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3936                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3937                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3938
3939                 fastrx.internal_forward =
3940                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3941                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3942                          !sdata->u.vlan.sta);
3943
3944                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3945                     sdata->u.vlan.sta) {
3946                         fastrx.expected_ds_bits |=
3947                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3948                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3949                         fastrx.internal_forward = 0;
3950                 }
3951
3952                 break;
3953         default:
3954                 goto clear;
3955         }
3956
3957         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3958                 goto clear;
3959
3960         rcu_read_lock();
3961         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3962         if (key) {
3963                 switch (key->conf.cipher) {
3964                 case WLAN_CIPHER_SUITE_TKIP:
3965                         /* we don't want to deal with MMIC in fast-rx */
3966                         goto clear_rcu;
3967                 case WLAN_CIPHER_SUITE_CCMP:
3968                 case WLAN_CIPHER_SUITE_CCMP_256:
3969                 case WLAN_CIPHER_SUITE_GCMP:
3970                 case WLAN_CIPHER_SUITE_GCMP_256:
3971                         break;
3972                 default:
3973                         /* we also don't want to deal with WEP or cipher scheme
3974                          * since those require looking up the key idx in the
3975                          * frame, rather than assuming the PTK is used
3976                          * (we need to revisit this once we implement the real
3977                          * PTK index, which is now valid in the spec, but we
3978                          * haven't implemented that part yet)
3979                          */
3980                         goto clear_rcu;
3981                 }
3982
3983                 fastrx.key = true;
3984                 fastrx.icv_len = key->conf.icv_len;
3985         }
3986
3987         assign = true;
3988  clear_rcu:
3989         rcu_read_unlock();
3990  clear:
3991         __release(check_fast_rx);
3992
3993         if (assign)
3994                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3995
3996         spin_lock_bh(&sta->lock);
3997         old = rcu_dereference_protected(sta->fast_rx, true);
3998         rcu_assign_pointer(sta->fast_rx, new);
3999         spin_unlock_bh(&sta->lock);
4000
4001         if (old)
4002                 kfree_rcu(old, rcu_head);
4003 }
4004
4005 void ieee80211_clear_fast_rx(struct sta_info *sta)
4006 {
4007         struct ieee80211_fast_rx *old;
4008
4009         spin_lock_bh(&sta->lock);
4010         old = rcu_dereference_protected(sta->fast_rx, true);
4011         RCU_INIT_POINTER(sta->fast_rx, NULL);
4012         spin_unlock_bh(&sta->lock);
4013
4014         if (old)
4015                 kfree_rcu(old, rcu_head);
4016 }
4017
4018 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4019 {
4020         struct ieee80211_local *local = sdata->local;
4021         struct sta_info *sta;
4022
4023         lockdep_assert_held(&local->sta_mtx);
4024
4025         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4026                 if (sdata != sta->sdata &&
4027                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4028                         continue;
4029                 ieee80211_check_fast_rx(sta);
4030         }
4031 }
4032
4033 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4034 {
4035         struct ieee80211_local *local = sdata->local;
4036
4037         mutex_lock(&local->sta_mtx);
4038         __ieee80211_check_fast_rx_iface(sdata);
4039         mutex_unlock(&local->sta_mtx);
4040 }
4041
4042 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4043                                      struct ieee80211_fast_rx *fast_rx)
4044 {
4045         struct sk_buff *skb = rx->skb;
4046         struct ieee80211_hdr *hdr = (void *)skb->data;
4047         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4048         struct sta_info *sta = rx->sta;
4049         int orig_len = skb->len;
4050         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4051         int snap_offs = hdrlen;
4052         struct {
4053                 u8 snap[sizeof(rfc1042_header)];
4054                 __be16 proto;
4055         } *payload __aligned(2);
4056         struct {
4057                 u8 da[ETH_ALEN];
4058                 u8 sa[ETH_ALEN];
4059         } addrs __aligned(2);
4060         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4061
4062         if (fast_rx->uses_rss)
4063                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4064
4065         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4066          * to a common data structure; drivers can implement that per queue
4067          * but we don't have that information in mac80211
4068          */
4069         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4070                 return false;
4071
4072 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4073
4074         /* If using encryption, we also need to have:
4075          *  - PN_VALIDATED: similar, but the implementation is tricky
4076          *  - DECRYPTED: necessary for PN_VALIDATED
4077          */
4078         if (fast_rx->key &&
4079             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4080                 return false;
4081
4082         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4083                 return false;
4084
4085         if (unlikely(ieee80211_is_frag(hdr)))
4086                 return false;
4087
4088         /* Since our interface address cannot be multicast, this
4089          * implicitly also rejects multicast frames without the
4090          * explicit check.
4091          *
4092          * We shouldn't get any *data* frames not addressed to us
4093          * (AP mode will accept multicast *management* frames), but
4094          * punting here will make it go through the full checks in
4095          * ieee80211_accept_frame().
4096          */
4097         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4098                 return false;
4099
4100         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4101                                               IEEE80211_FCTL_TODS)) !=
4102             fast_rx->expected_ds_bits)
4103                 return false;
4104
4105         /* assign the key to drop unencrypted frames (later)
4106          * and strip the IV/MIC if necessary
4107          */
4108         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4109                 /* GCMP header length is the same */
4110                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4111         }
4112
4113         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4114                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4115                         goto drop;
4116
4117                 payload = (void *)(skb->data + snap_offs);
4118
4119                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4120                         return false;
4121
4122                 /* Don't handle these here since they require special code.
4123                  * Accept AARP and IPX even though they should come with a
4124                  * bridge-tunnel header - but if we get them this way then
4125                  * there's little point in discarding them.
4126                  */
4127                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4128                              payload->proto == fast_rx->control_port_protocol))
4129                         return false;
4130         }
4131
4132         /* after this point, don't punt to the slowpath! */
4133
4134         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4135             pskb_trim(skb, skb->len - fast_rx->icv_len))
4136                 goto drop;
4137
4138         if (unlikely(fast_rx->sta_notify)) {
4139                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4140                 fast_rx->sta_notify = false;
4141         }
4142
4143         /* statistics part of ieee80211_rx_h_sta_process() */
4144         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4145                 stats->last_signal = status->signal;
4146                 if (!fast_rx->uses_rss)
4147                         ewma_signal_add(&sta->rx_stats_avg.signal,
4148                                         -status->signal);
4149         }
4150
4151         if (status->chains) {
4152                 int i;
4153
4154                 stats->chains = status->chains;
4155                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4156                         int signal = status->chain_signal[i];
4157
4158                         if (!(status->chains & BIT(i)))
4159                                 continue;
4160
4161                         stats->chain_signal_last[i] = signal;
4162                         if (!fast_rx->uses_rss)
4163                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4164                                                 -signal);
4165                 }
4166         }
4167         /* end of statistics */
4168
4169         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4170                 goto drop;
4171
4172         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4173                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4174                     RX_QUEUED)
4175                         goto drop;
4176
4177                 return true;
4178         }
4179
4180         stats->last_rx = jiffies;
4181         stats->last_rate = sta_stats_encode_rate(status);
4182
4183         stats->fragments++;
4184         stats->packets++;
4185
4186         /* do the header conversion - first grab the addresses */
4187         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4188         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4189         /* remove the SNAP but leave the ethertype */
4190         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4191         /* push the addresses in front */
4192         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4193
4194         skb->dev = fast_rx->dev;
4195
4196         ieee80211_rx_stats(fast_rx->dev, skb->len);
4197
4198         /* The seqno index has the same property as needed
4199          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4200          * for non-QoS-data frames. Here we know it's a data
4201          * frame, so count MSDUs.
4202          */
4203         u64_stats_update_begin(&stats->syncp);
4204         stats->msdu[rx->seqno_idx]++;
4205         stats->bytes += orig_len;
4206         u64_stats_update_end(&stats->syncp);
4207
4208         if (fast_rx->internal_forward) {
4209                 struct sk_buff *xmit_skb = NULL;
4210                 bool multicast = is_multicast_ether_addr(skb->data);
4211
4212                 if (multicast) {
4213                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4214                 } else if (sta_info_get(rx->sdata, skb->data)) {
4215                         xmit_skb = skb;
4216                         skb = NULL;
4217                 }
4218
4219                 if (xmit_skb) {
4220                         /*
4221                          * Send to wireless media and increase priority by 256
4222                          * to keep the received priority instead of
4223                          * reclassifying the frame (see cfg80211_classify8021d).
4224                          */
4225                         xmit_skb->priority += 256;
4226                         xmit_skb->protocol = htons(ETH_P_802_3);
4227                         skb_reset_network_header(xmit_skb);
4228                         skb_reset_mac_header(xmit_skb);
4229                         dev_queue_xmit(xmit_skb);
4230                 }
4231
4232                 if (!skb)
4233                         return true;
4234         }
4235
4236         /* deliver to local stack */
4237         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4238         memset(skb->cb, 0, sizeof(skb->cb));
4239         if (rx->napi)
4240                 napi_gro_receive(rx->napi, skb);
4241         else
4242                 netif_receive_skb(skb);
4243
4244         return true;
4245  drop:
4246         dev_kfree_skb(skb);
4247         stats->dropped++;
4248         return true;
4249 }
4250
4251 /*
4252  * This function returns whether or not the SKB
4253  * was destined for RX processing or not, which,
4254  * if consume is true, is equivalent to whether
4255  * or not the skb was consumed.
4256  */
4257 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4258                                             struct sk_buff *skb, bool consume)
4259 {
4260         struct ieee80211_local *local = rx->local;
4261         struct ieee80211_sub_if_data *sdata = rx->sdata;
4262
4263         rx->skb = skb;
4264
4265         /* See if we can do fast-rx; if we have to copy we already lost,
4266          * so punt in that case. We should never have to deliver a data
4267          * frame to multiple interfaces anyway.
4268          *
4269          * We skip the ieee80211_accept_frame() call and do the necessary
4270          * checking inside ieee80211_invoke_fast_rx().
4271          */
4272         if (consume && rx->sta) {
4273                 struct ieee80211_fast_rx *fast_rx;
4274
4275                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4276                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4277                         return true;
4278         }
4279
4280         if (!ieee80211_accept_frame(rx))
4281                 return false;
4282
4283         if (!consume) {
4284                 skb = skb_copy(skb, GFP_ATOMIC);
4285                 if (!skb) {
4286                         if (net_ratelimit())
4287                                 wiphy_debug(local->hw.wiphy,
4288                                         "failed to copy skb for %s\n",
4289                                         sdata->name);
4290                         return true;
4291                 }
4292
4293                 rx->skb = skb;
4294         }
4295
4296         ieee80211_invoke_rx_handlers(rx);
4297         return true;
4298 }
4299
4300 /*
4301  * This is the actual Rx frames handler. as it belongs to Rx path it must
4302  * be called with rcu_read_lock protection.
4303  */
4304 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4305                                          struct ieee80211_sta *pubsta,
4306                                          struct sk_buff *skb,
4307                                          struct napi_struct *napi)
4308 {
4309         struct ieee80211_local *local = hw_to_local(hw);
4310         struct ieee80211_sub_if_data *sdata;
4311         struct ieee80211_hdr *hdr;
4312         __le16 fc;
4313         struct ieee80211_rx_data rx;
4314         struct ieee80211_sub_if_data *prev;
4315         struct rhlist_head *tmp;
4316         int err = 0;
4317
4318         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4319         memset(&rx, 0, sizeof(rx));
4320         rx.skb = skb;
4321         rx.local = local;
4322         rx.napi = napi;
4323
4324         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4325                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4326
4327         if (ieee80211_is_mgmt(fc)) {
4328                 /* drop frame if too short for header */
4329                 if (skb->len < ieee80211_hdrlen(fc))
4330                         err = -ENOBUFS;
4331                 else
4332                         err = skb_linearize(skb);
4333         } else {
4334                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4335         }
4336
4337         if (err) {
4338                 dev_kfree_skb(skb);
4339                 return;
4340         }
4341
4342         hdr = (struct ieee80211_hdr *)skb->data;
4343         ieee80211_parse_qos(&rx);
4344         ieee80211_verify_alignment(&rx);
4345
4346         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4347                      ieee80211_is_beacon(hdr->frame_control)))
4348                 ieee80211_scan_rx(local, skb);
4349
4350         if (ieee80211_is_data(fc)) {
4351                 struct sta_info *sta, *prev_sta;
4352
4353                 if (pubsta) {
4354                         rx.sta = container_of(pubsta, struct sta_info, sta);
4355                         rx.sdata = rx.sta->sdata;
4356                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4357                                 return;
4358                         goto out;
4359                 }
4360
4361                 prev_sta = NULL;
4362
4363                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4364                         if (!prev_sta) {
4365                                 prev_sta = sta;
4366                                 continue;
4367                         }
4368
4369                         rx.sta = prev_sta;
4370                         rx.sdata = prev_sta->sdata;
4371                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4372
4373                         prev_sta = sta;
4374                 }
4375
4376                 if (prev_sta) {
4377                         rx.sta = prev_sta;
4378                         rx.sdata = prev_sta->sdata;
4379
4380                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4381                                 return;
4382                         goto out;
4383                 }
4384         }
4385
4386         prev = NULL;
4387
4388         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4389                 if (!ieee80211_sdata_running(sdata))
4390                         continue;
4391
4392                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4393                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4394                         continue;
4395
4396                 /*
4397                  * frame is destined for this interface, but if it's
4398                  * not also for the previous one we handle that after
4399                  * the loop to avoid copying the SKB once too much
4400                  */
4401
4402                 if (!prev) {
4403                         prev = sdata;
4404                         continue;
4405                 }
4406
4407                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4408                 rx.sdata = prev;
4409                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4410
4411                 prev = sdata;
4412         }
4413
4414         if (prev) {
4415                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4416                 rx.sdata = prev;
4417
4418                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4419                         return;
4420         }
4421
4422  out:
4423         dev_kfree_skb(skb);
4424 }
4425
4426 /*
4427  * This is the receive path handler. It is called by a low level driver when an
4428  * 802.11 MPDU is received from the hardware.
4429  */
4430 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4431                        struct sk_buff *skb, struct napi_struct *napi)
4432 {
4433         struct ieee80211_local *local = hw_to_local(hw);
4434         struct ieee80211_rate *rate = NULL;
4435         struct ieee80211_supported_band *sband;
4436         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4437
4438         WARN_ON_ONCE(softirq_count() == 0);
4439
4440         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4441                 goto drop;
4442
4443         sband = local->hw.wiphy->bands[status->band];
4444         if (WARN_ON(!sband))
4445                 goto drop;
4446
4447         /*
4448          * If we're suspending, it is possible although not too likely
4449          * that we'd be receiving frames after having already partially
4450          * quiesced the stack. We can't process such frames then since
4451          * that might, for example, cause stations to be added or other
4452          * driver callbacks be invoked.
4453          */
4454         if (unlikely(local->quiescing || local->suspended))
4455                 goto drop;
4456
4457         /* We might be during a HW reconfig, prevent Rx for the same reason */
4458         if (unlikely(local->in_reconfig))
4459                 goto drop;
4460
4461         /*
4462          * The same happens when we're not even started,
4463          * but that's worth a warning.
4464          */
4465         if (WARN_ON(!local->started))
4466                 goto drop;
4467
4468         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4469                 /*
4470                  * Validate the rate, unless a PLCP error means that
4471                  * we probably can't have a valid rate here anyway.
4472                  */
4473
4474                 switch (status->encoding) {
4475                 case RX_ENC_HT:
4476                         /*
4477                          * rate_idx is MCS index, which can be [0-76]
4478                          * as documented on:
4479                          *
4480                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4481                          *
4482                          * Anything else would be some sort of driver or
4483                          * hardware error. The driver should catch hardware
4484                          * errors.
4485                          */
4486                         if (WARN(status->rate_idx > 76,
4487                                  "Rate marked as an HT rate but passed "
4488                                  "status->rate_idx is not "
4489                                  "an MCS index [0-76]: %d (0x%02x)\n",
4490                                  status->rate_idx,
4491                                  status->rate_idx))
4492                                 goto drop;
4493                         break;
4494                 case RX_ENC_VHT:
4495                         if (WARN_ONCE(status->rate_idx > 9 ||
4496                                       !status->nss ||
4497                                       status->nss > 8,
4498                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4499                                       status->rate_idx, status->nss))
4500                                 goto drop;
4501                         break;
4502                 case RX_ENC_HE:
4503                         if (WARN_ONCE(status->rate_idx > 11 ||
4504                                       !status->nss ||
4505                                       status->nss > 8,
4506                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4507                                       status->rate_idx, status->nss))
4508                                 goto drop;
4509                         break;
4510                 default:
4511                         WARN_ON_ONCE(1);
4512                         /* fall through */
4513                 case RX_ENC_LEGACY:
4514                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4515                                 goto drop;
4516                         rate = &sband->bitrates[status->rate_idx];
4517                 }
4518         }
4519
4520         status->rx_flags = 0;
4521
4522         /*
4523          * key references and virtual interfaces are protected using RCU
4524          * and this requires that we are in a read-side RCU section during
4525          * receive processing
4526          */
4527         rcu_read_lock();
4528
4529         /*
4530          * Frames with failed FCS/PLCP checksum are not returned,
4531          * all other frames are returned without radiotap header
4532          * if it was previously present.
4533          * Also, frames with less than 16 bytes are dropped.
4534          */
4535         skb = ieee80211_rx_monitor(local, skb, rate);
4536         if (!skb) {
4537                 rcu_read_unlock();
4538                 return;
4539         }
4540
4541         ieee80211_tpt_led_trig_rx(local,
4542                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4543                         skb->len);
4544
4545         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4546
4547         rcu_read_unlock();
4548
4549         return;
4550  drop:
4551         kfree_skb(skb);
4552 }
4553 EXPORT_SYMBOL(ieee80211_rx_napi);
4554
4555 /* This is a version of the rx handler that can be called from hard irq
4556  * context. Post the skb on the queue and schedule the tasklet */
4557 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4558 {
4559         struct ieee80211_local *local = hw_to_local(hw);
4560
4561         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4562
4563         skb->pkt_type = IEEE80211_RX_MSG;
4564         skb_queue_tail(&local->skb_queue, skb);
4565         tasklet_schedule(&local->tasklet);
4566 }
4567 EXPORT_SYMBOL(ieee80211_rx_irqsafe);