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 <[email protected]>
   5  * Copyright 2007-2010  Johannes Berg <[email protected]>
   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             (ieee80211_is_mgmt(hdr->frame_control) ||
1732              ieee80211_is_data(hdr->frame_control)) &&
1733             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1734             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1735              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1736                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1737                         if (!ieee80211_has_pm(hdr->frame_control))
1738                                 sta_ps_end(sta);
1739                 } else {
1740                         if (ieee80211_has_pm(hdr->frame_control))
1741                                 sta_ps_start(sta);
1742                 }
1743         }
1744
1745         /* mesh power save support */
1746         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1747                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1748
1749         /*
1750          * Drop (qos-)data::nullfunc frames silently, since they
1751          * are used only to control station power saving mode.
1752          */
1753         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1754             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1755                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1756
1757                 /*
1758                  * If we receive a 4-addr nullfunc frame from a STA
1759                  * that was not moved to a 4-addr STA vlan yet send
1760                  * the event to userspace and for older hostapd drop
1761                  * the frame to the monitor interface.
1762                  */
1763                 if (ieee80211_has_a4(hdr->frame_control) &&
1764                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1765                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1766                       !rx->sdata->u.vlan.sta))) {
1767                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1768                                 cfg80211_rx_unexpected_4addr_frame(
1769                                         rx->sdata->dev, sta->sta.addr,
1770                                         GFP_ATOMIC);
1771                         return RX_DROP_MONITOR;
1772                 }
1773                 /*
1774                  * Update counter and free packet here to avoid
1775                  * counting this as a dropped packed.
1776                  */
1777                 sta->rx_stats.packets++;
1778                 dev_kfree_skb(rx->skb);
1779                 return RX_QUEUED;
1780         }
1781
1782         return RX_CONTINUE;
1783 } /* ieee80211_rx_h_sta_process */
1784
1785 static ieee80211_rx_result debug_noinline
1786 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1787 {
1788         struct sk_buff *skb = rx->skb;
1789         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1790         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1791         int keyidx;
1792         int hdrlen;
1793         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1794         struct ieee80211_key *sta_ptk = NULL;
1795         int mmie_keyidx = -1;
1796         __le16 fc;
1797         const struct ieee80211_cipher_scheme *cs = NULL;
1798
1799         /*
1800          * Key selection 101
1801          *
1802          * There are four types of keys:
1803          *  - GTK (group keys)
1804          *  - IGTK (group keys for management frames)
1805          *  - PTK (pairwise keys)
1806          *  - STK (station-to-station pairwise keys)
1807          *
1808          * When selecting a key, we have to distinguish between multicast
1809          * (including broadcast) and unicast frames, the latter can only
1810          * use PTKs and STKs while the former always use GTKs and IGTKs.
1811          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1812          * unicast frames can also use key indices like GTKs. Hence, if we
1813          * don't have a PTK/STK we check the key index for a WEP key.
1814          *
1815          * Note that in a regular BSS, multicast frames are sent by the
1816          * AP only, associated stations unicast the frame to the AP first
1817          * which then multicasts it on their behalf.
1818          *
1819          * There is also a slight problem in IBSS mode: GTKs are negotiated
1820          * with each station, that is something we don't currently handle.
1821          * The spec seems to expect that one negotiates the same key with
1822          * every station but there's no such requirement; VLANs could be
1823          * possible.
1824          */
1825
1826         /* start without a key */
1827         rx->key = NULL;
1828         fc = hdr->frame_control;
1829
1830         if (rx->sta) {
1831                 int keyid = rx->sta->ptk_idx;
1832
1833                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1834                         cs = rx->sta->cipher_scheme;
1835                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1836                         if (unlikely(keyid < 0))
1837                                 return RX_DROP_UNUSABLE;
1838                 }
1839                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1840         }
1841
1842         if (!ieee80211_has_protected(fc))
1843                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1844
1845         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1846                 rx->key = sta_ptk;
1847                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1848                     (status->flag & RX_FLAG_IV_STRIPPED))
1849                         return RX_CONTINUE;
1850                 /* Skip decryption if the frame is not protected. */
1851                 if (!ieee80211_has_protected(fc))
1852                         return RX_CONTINUE;
1853         } else if (mmie_keyidx >= 0) {
1854                 /* Broadcast/multicast robust management frame / BIP */
1855                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1856                     (status->flag & RX_FLAG_IV_STRIPPED))
1857                         return RX_CONTINUE;
1858
1859                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1860                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1861                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1862                 if (rx->sta) {
1863                         if (ieee80211_is_group_privacy_action(skb) &&
1864                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1865                                 return RX_DROP_MONITOR;
1866
1867                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1868                 }
1869                 if (!rx->key)
1870                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1871         } else if (!ieee80211_has_protected(fc)) {
1872                 /*
1873                  * The frame was not protected, so skip decryption. However, we
1874                  * need to set rx->key if there is a key that could have been
1875                  * used so that the frame may be dropped if encryption would
1876                  * have been expected.
1877                  */
1878                 struct ieee80211_key *key = NULL;
1879                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1880                 int i;
1881
1882                 if (ieee80211_is_mgmt(fc) &&
1883                     is_multicast_ether_addr(hdr->addr1) &&
1884                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1885                         rx->key = key;
1886                 else {
1887                         if (rx->sta) {
1888                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1889                                         key = rcu_dereference(rx->sta->gtk[i]);
1890                                         if (key)
1891                                                 break;
1892                                 }
1893                         }
1894                         if (!key) {
1895                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1896                                         key = rcu_dereference(sdata->keys[i]);
1897                                         if (key)
1898                                                 break;
1899                                 }
1900                         }
1901                         if (key)
1902                                 rx->key = key;
1903                 }
1904                 return RX_CONTINUE;
1905         } else {
1906                 u8 keyid;
1907
1908                 /*
1909                  * The device doesn't give us the IV so we won't be
1910                  * able to look up the key. That's ok though, we
1911                  * don't need to decrypt the frame, we just won't
1912                  * be able to keep statistics accurate.
1913                  * Except for key threshold notifications, should
1914                  * we somehow allow the driver to tell us which key
1915                  * the hardware used if this flag is set?
1916                  */
1917                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1918                     (status->flag & RX_FLAG_IV_STRIPPED))
1919                         return RX_CONTINUE;
1920
1921                 hdrlen = ieee80211_hdrlen(fc);
1922
1923                 if (cs) {
1924                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1925
1926                         if (unlikely(keyidx < 0))
1927                                 return RX_DROP_UNUSABLE;
1928                 } else {
1929                         if (rx->skb->len < 8 + hdrlen)
1930                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1931                         /*
1932                          * no need to call ieee80211_wep_get_keyidx,
1933                          * it verifies a bunch of things we've done already
1934                          */
1935                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1936                         keyidx = keyid >> 6;
1937                 }
1938
1939                 /* check per-station GTK first, if multicast packet */
1940                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1941                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1942
1943                 /* if not found, try default key */
1944                 if (!rx->key) {
1945                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1946
1947                         /*
1948                          * RSNA-protected unicast frames should always be
1949                          * sent with pairwise or station-to-station keys,
1950                          * but for WEP we allow using a key index as well.
1951                          */
1952                         if (rx->key &&
1953                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1954                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1955                             !is_multicast_ether_addr(hdr->addr1))
1956                                 rx->key = NULL;
1957                 }
1958         }
1959
1960         if (rx->key) {
1961                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1962                         return RX_DROP_MONITOR;
1963
1964                 /* TODO: add threshold stuff again */
1965         } else {
1966                 return RX_DROP_MONITOR;
1967         }
1968
1969         switch (rx->key->conf.cipher) {
1970         case WLAN_CIPHER_SUITE_WEP40:
1971         case WLAN_CIPHER_SUITE_WEP104:
1972                 result = ieee80211_crypto_wep_decrypt(rx);
1973                 break;
1974         case WLAN_CIPHER_SUITE_TKIP:
1975                 result = ieee80211_crypto_tkip_decrypt(rx);
1976                 break;
1977         case WLAN_CIPHER_SUITE_CCMP:
1978                 result = ieee80211_crypto_ccmp_decrypt(
1979                         rx, IEEE80211_CCMP_MIC_LEN);
1980                 break;
1981         case WLAN_CIPHER_SUITE_CCMP_256:
1982                 result = ieee80211_crypto_ccmp_decrypt(
1983                         rx, IEEE80211_CCMP_256_MIC_LEN);
1984                 break;
1985         case WLAN_CIPHER_SUITE_AES_CMAC:
1986                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1987                 break;
1988         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1989                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1990                 break;
1991         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1992         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1993                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1994                 break;
1995         case WLAN_CIPHER_SUITE_GCMP:
1996         case WLAN_CIPHER_SUITE_GCMP_256:
1997                 result = ieee80211_crypto_gcmp_decrypt(rx);
1998                 break;
1999         default:
2000                 result = ieee80211_crypto_hw_decrypt(rx);
2001         }
2002
2003         /* the hdr variable is invalid after the decrypt handlers */
2004
2005         /* either the frame has been decrypted or will be dropped */
2006         status->flag |= RX_FLAG_DECRYPTED;
2007
2008         return result;
2009 }
2010
2011 static inline struct ieee80211_fragment_entry *
2012 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2013                          unsigned int frag, unsigned int seq, int rx_queue,
2014                          struct sk_buff **skb)
2015 {
2016         struct ieee80211_fragment_entry *entry;
2017
2018         entry = &sdata->fragments[sdata->fragment_next++];
2019         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2020                 sdata->fragment_next = 0;
2021
2022         if (!skb_queue_empty(&entry->skb_list))
2023                 __skb_queue_purge(&entry->skb_list);
2024
2025         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2026         *skb = NULL;
2027         entry->first_frag_time = jiffies;
2028         entry->seq = seq;
2029         entry->rx_queue = rx_queue;
2030         entry->last_frag = frag;
2031         entry->check_sequential_pn = false;
2032         entry->extra_len = 0;
2033
2034         return entry;
2035 }
2036
2037 static inline struct ieee80211_fragment_entry *
2038 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2039                           unsigned int frag, unsigned int seq,
2040                           int rx_queue, struct ieee80211_hdr *hdr)
2041 {
2042         struct ieee80211_fragment_entry *entry;
2043         int i, idx;
2044
2045         idx = sdata->fragment_next;
2046         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2047                 struct ieee80211_hdr *f_hdr;
2048
2049                 idx--;
2050                 if (idx < 0)
2051                         idx = IEEE80211_FRAGMENT_MAX - 1;
2052
2053                 entry = &sdata->fragments[idx];
2054                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2055                     entry->rx_queue != rx_queue ||
2056                     entry->last_frag + 1 != frag)
2057                         continue;
2058
2059                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
2060
2061                 /*
2062                  * Check ftype and addresses are equal, else check next fragment
2063                  */
2064                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2065                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2066                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2067                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2068                         continue;
2069
2070                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2071                         __skb_queue_purge(&entry->skb_list);
2072                         continue;
2073                 }
2074                 return entry;
2075         }
2076
2077         return NULL;
2078 }
2079
2080 static ieee80211_rx_result debug_noinline
2081 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2082 {
2083         struct ieee80211_hdr *hdr;
2084         u16 sc;
2085         __le16 fc;
2086         unsigned int frag, seq;
2087         struct ieee80211_fragment_entry *entry;
2088         struct sk_buff *skb;
2089
2090         hdr = (struct ieee80211_hdr *)rx->skb->data;
2091         fc = hdr->frame_control;
2092
2093         if (ieee80211_is_ctl(fc))
2094                 return RX_CONTINUE;
2095
2096         sc = le16_to_cpu(hdr->seq_ctrl);
2097         frag = sc & IEEE80211_SCTL_FRAG;
2098
2099         if (is_multicast_ether_addr(hdr->addr1)) {
2100                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2101                 goto out_no_led;
2102         }
2103
2104         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2105                 goto out;
2106
2107         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2108
2109         if (skb_linearize(rx->skb))
2110                 return RX_DROP_UNUSABLE;
2111
2112         /*
2113          *  skb_linearize() might change the skb->data and
2114          *  previously cached variables (in this case, hdr) need to
2115          *  be refreshed with the new data.
2116          */
2117         hdr = (struct ieee80211_hdr *)rx->skb->data;
2118         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2119
2120         if (frag == 0) {
2121                 /* This is the first fragment of a new frame. */
2122                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2123                                                  rx->seqno_idx, &(rx->skb));
2124                 if (rx->key &&
2125                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2126                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2127                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2128                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2129                     ieee80211_has_protected(fc)) {
2130                         int queue = rx->security_idx;
2131
2132                         /* Store CCMP/GCMP PN so that we can verify that the
2133                          * next fragment has a sequential PN value.
2134                          */
2135                         entry->check_sequential_pn = true;
2136                         memcpy(entry->last_pn,
2137                                rx->key->u.ccmp.rx_pn[queue],
2138                                IEEE80211_CCMP_PN_LEN);
2139                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2140                                               u.ccmp.rx_pn) !=
2141                                      offsetof(struct ieee80211_key,
2142                                               u.gcmp.rx_pn));
2143                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2144                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2145                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2146                                      IEEE80211_GCMP_PN_LEN);
2147                 }
2148                 return RX_QUEUED;
2149         }
2150
2151         /* This is a fragment for a frame that should already be pending in
2152          * fragment cache. Add this fragment to the end of the pending entry.
2153          */
2154         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2155                                           rx->seqno_idx, hdr);
2156         if (!entry) {
2157                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2158                 return RX_DROP_MONITOR;
2159         }
2160
2161         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2162          *  MPDU PN values are not incrementing in steps of 1."
2163          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2164          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2165          */
2166         if (entry->check_sequential_pn) {
2167                 int i;
2168                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2169                 int queue;
2170
2171                 if (!rx->key ||
2172                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2173                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2174                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2175                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2176                         return RX_DROP_UNUSABLE;
2177                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2178                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2179                         pn[i]++;
2180                         if (pn[i])
2181                                 break;
2182                 }
2183                 queue = rx->security_idx;
2184                 rpn = rx->key->u.ccmp.rx_pn[queue];
2185                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2186                         return RX_DROP_UNUSABLE;
2187                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2188         }
2189
2190         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2191         __skb_queue_tail(&entry->skb_list, rx->skb);
2192         entry->last_frag = frag;
2193         entry->extra_len += rx->skb->len;
2194         if (ieee80211_has_morefrags(fc)) {
2195                 rx->skb = NULL;
2196                 return RX_QUEUED;
2197         }
2198
2199         rx->skb = __skb_dequeue(&entry->skb_list);
2200         if (skb_tailroom(rx->skb) < entry->extra_len) {
2201                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2202                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2203                                               GFP_ATOMIC))) {
2204                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2205                         __skb_queue_purge(&entry->skb_list);
2206                         return RX_DROP_UNUSABLE;
2207                 }
2208         }
2209         while ((skb = __skb_dequeue(&entry->skb_list))) {
2210                 skb_put_data(rx->skb, skb->data, skb->len);
2211                 dev_kfree_skb(skb);
2212         }
2213
2214  out:
2215         ieee80211_led_rx(rx->local);
2216  out_no_led:
2217         if (rx->sta)
2218                 rx->sta->rx_stats.packets++;
2219         return RX_CONTINUE;
2220 }
2221
2222 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2223 {
2224         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2225                 return -EACCES;
2226
2227         return 0;
2228 }
2229
2230 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2231 {
2232         struct sk_buff *skb = rx->skb;
2233         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2234
2235         /*
2236          * Pass through unencrypted frames if the hardware has
2237          * decrypted them already.
2238          */
2239         if (status->flag & RX_FLAG_DECRYPTED)
2240                 return 0;
2241
2242         /* Drop unencrypted frames if key is set. */
2243         if (unlikely(!ieee80211_has_protected(fc) &&
2244                      !ieee80211_is_nullfunc(fc) &&
2245                      ieee80211_is_data(fc) && rx->key))
2246                 return -EACCES;
2247
2248         return 0;
2249 }
2250
2251 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2252 {
2253         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2254         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2255         __le16 fc = hdr->frame_control;
2256
2257         /*
2258          * Pass through unencrypted frames if the hardware has
2259          * decrypted them already.
2260          */
2261         if (status->flag & RX_FLAG_DECRYPTED)
2262                 return 0;
2263
2264         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2265                 if (unlikely(!ieee80211_has_protected(fc) &&
2266                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2267                              rx->key)) {
2268                         if (ieee80211_is_deauth(fc) ||
2269                             ieee80211_is_disassoc(fc))
2270                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2271                                                              rx->skb->data,
2272                                                              rx->skb->len);
2273                         return -EACCES;
2274                 }
2275                 /* BIP does not use Protected field, so need to check MMIE */
2276                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2277                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2278                         if (ieee80211_is_deauth(fc) ||
2279                             ieee80211_is_disassoc(fc))
2280                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2281                                                              rx->skb->data,
2282                                                              rx->skb->len);
2283                         return -EACCES;
2284                 }
2285                 /*
2286                  * When using MFP, Action frames are not allowed prior to
2287                  * having configured keys.
2288                  */
2289                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2290                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2291                         return -EACCES;
2292         }
2293
2294         return 0;
2295 }
2296
2297 static int
2298 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2299 {
2300         struct ieee80211_sub_if_data *sdata = rx->sdata;
2301         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2302         bool check_port_control = false;
2303         struct ethhdr *ehdr;
2304         int ret;
2305
2306         *port_control = false;
2307         if (ieee80211_has_a4(hdr->frame_control) &&
2308             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2309                 return -1;
2310
2311         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2312             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2313
2314                 if (!sdata->u.mgd.use_4addr)
2315                         return -1;
2316                 else
2317                         check_port_control = true;
2318         }
2319
2320         if (is_multicast_ether_addr(hdr->addr1) &&
2321             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2322                 return -1;
2323
2324         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2325         if (ret < 0)
2326                 return ret;
2327
2328         ehdr = (struct ethhdr *) rx->skb->data;
2329         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2330                 *port_control = true;
2331         else if (check_port_control)
2332                 return -1;
2333
2334         return 0;
2335 }
2336
2337 /*
2338  * requires that rx->skb is a frame with ethernet header
2339  */
2340 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2341 {
2342         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2343                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2344         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2345
2346         /*
2347          * Allow EAPOL frames to us/the PAE group address regardless
2348          * of whether the frame was encrypted or not.
2349          */
2350         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2351             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2352              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2353                 return true;
2354
2355         if (ieee80211_802_1x_port_control(rx) ||
2356             ieee80211_drop_unencrypted(rx, fc))
2357                 return false;
2358
2359         return true;
2360 }
2361
2362 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2363                                                  struct ieee80211_rx_data *rx)
2364 {
2365         struct ieee80211_sub_if_data *sdata = rx->sdata;
2366         struct net_device *dev = sdata->dev;
2367
2368         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2369                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2370                      sdata->control_port_over_nl80211)) {
2371                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2372                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2373
2374                 cfg80211_rx_control_port(dev, skb, noencrypt);
2375                 dev_kfree_skb(skb);
2376         } else {
2377                 /* deliver to local stack */
2378                 if (rx->napi)
2379                         napi_gro_receive(rx->napi, skb);
2380                 else
2381                         netif_receive_skb(skb);
2382         }
2383 }
2384
2385 /*
2386  * requires that rx->skb is a frame with ethernet header
2387  */
2388 static void
2389 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2390 {
2391         struct ieee80211_sub_if_data *sdata = rx->sdata;
2392         struct net_device *dev = sdata->dev;
2393         struct sk_buff *skb, *xmit_skb;
2394         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2395         struct sta_info *dsta;
2396
2397         skb = rx->skb;
2398         xmit_skb = NULL;
2399
2400         ieee80211_rx_stats(dev, skb->len);
2401
2402         if (rx->sta) {
2403                 /* The seqno index has the same property as needed
2404                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2405                  * for non-QoS-data frames. Here we know it's a data
2406                  * frame, so count MSDUs.
2407                  */
2408                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2409                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2410                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2411         }
2412
2413         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2414              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2415             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2416             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2417                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2418                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2419                         /*
2420                          * send multicast frames both to higher layers in
2421                          * local net stack and back to the wireless medium
2422                          */
2423                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2424                         if (!xmit_skb)
2425                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2426                                                     dev->name);
2427                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2428                         dsta = sta_info_get(sdata, skb->data);
2429                         if (dsta) {
2430                                 /*
2431                                  * The destination station is associated to
2432                                  * this AP (in this VLAN), so send the frame
2433                                  * directly to it and do not pass it to local
2434                                  * net stack.
2435                                  */
2436                                 xmit_skb = skb;
2437                                 skb = NULL;
2438                         }
2439                 }
2440         }
2441
2442 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2443         if (skb) {
2444                 /* 'align' will only take the values 0 or 2 here since all
2445                  * frames are required to be aligned to 2-byte boundaries
2446                  * when being passed to mac80211; the code here works just
2447                  * as well if that isn't true, but mac80211 assumes it can
2448                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2449                  */
2450                 int align;
2451
2452                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2453                 if (align) {
2454                         if (WARN_ON(skb_headroom(skb) < 3)) {
2455                                 dev_kfree_skb(skb);
2456                                 skb = NULL;
2457                         } else {
2458                                 u8 *data = skb->data;
2459                                 size_t len = skb_headlen(skb);
2460                                 skb->data -= align;
2461                                 memmove(skb->data, data, len);
2462                                 skb_set_tail_pointer(skb, len);
2463                         }
2464                 }
2465         }
2466 #endif
2467
2468         if (skb) {
2469                 skb->protocol = eth_type_trans(skb, dev);
2470                 memset(skb->cb, 0, sizeof(skb->cb));
2471
2472                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2473         }
2474
2475         if (xmit_skb) {
2476                 /*
2477                  * Send to wireless media and increase priority by 256 to
2478                  * keep the received priority instead of reclassifying
2479                  * the frame (see cfg80211_classify8021d).
2480                  */
2481                 xmit_skb->priority += 256;
2482                 xmit_skb->protocol = htons(ETH_P_802_3);
2483                 skb_reset_network_header(xmit_skb);
2484                 skb_reset_mac_header(xmit_skb);
2485                 dev_queue_xmit(xmit_skb);
2486         }
2487 }
2488
2489 static ieee80211_rx_result debug_noinline
2490 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2491 {
2492         struct net_device *dev = rx->sdata->dev;
2493         struct sk_buff *skb = rx->skb;
2494         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2495         __le16 fc = hdr->frame_control;
2496         struct sk_buff_head frame_list;
2497         struct ethhdr ethhdr;
2498         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2499
2500         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2501                 check_da = NULL;
2502                 check_sa = NULL;
2503         } else switch (rx->sdata->vif.type) {
2504                 case NL80211_IFTYPE_AP:
2505                 case NL80211_IFTYPE_AP_VLAN:
2506                         check_da = NULL;
2507                         break;
2508                 case NL80211_IFTYPE_STATION:
2509                         if (!rx->sta ||
2510                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2511                                 check_sa = NULL;
2512                         break;
2513                 case NL80211_IFTYPE_MESH_POINT:
2514                         check_sa = NULL;
2515                         break;
2516                 default:
2517                         break;
2518         }
2519
2520         skb->dev = dev;
2521         __skb_queue_head_init(&frame_list);
2522
2523         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2524                                           rx->sdata->vif.addr,
2525                                           rx->sdata->vif.type,
2526                                           data_offset))
2527                 return RX_DROP_UNUSABLE;
2528
2529         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2530                                  rx->sdata->vif.type,
2531                                  rx->local->hw.extra_tx_headroom,
2532                                  check_da, check_sa);
2533
2534         while (!skb_queue_empty(&frame_list)) {
2535                 rx->skb = __skb_dequeue(&frame_list);
2536
2537                 if (!ieee80211_frame_allowed(rx, fc)) {
2538                         dev_kfree_skb(rx->skb);
2539                         continue;
2540                 }
2541
2542                 ieee80211_deliver_skb(rx);
2543         }
2544
2545         return RX_QUEUED;
2546 }
2547
2548 static ieee80211_rx_result debug_noinline
2549 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2550 {
2551         struct sk_buff *skb = rx->skb;
2552         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2553         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2554         __le16 fc = hdr->frame_control;
2555
2556         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2557                 return RX_CONTINUE;
2558
2559         if (unlikely(!ieee80211_is_data(fc)))
2560                 return RX_CONTINUE;
2561
2562         if (unlikely(!ieee80211_is_data_present(fc)))
2563                 return RX_DROP_MONITOR;
2564
2565         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2566                 switch (rx->sdata->vif.type) {
2567                 case NL80211_IFTYPE_AP_VLAN:
2568                         if (!rx->sdata->u.vlan.sta)
2569                                 return RX_DROP_UNUSABLE;
2570                         break;
2571                 case NL80211_IFTYPE_STATION:
2572                         if (!rx->sdata->u.mgd.use_4addr)
2573                                 return RX_DROP_UNUSABLE;
2574                         break;
2575                 default:
2576                         return RX_DROP_UNUSABLE;
2577                 }
2578         }
2579
2580         if (is_multicast_ether_addr(hdr->addr1))
2581                 return RX_DROP_UNUSABLE;
2582
2583         return __ieee80211_rx_h_amsdu(rx, 0);
2584 }
2585
2586 #ifdef CONFIG_MAC80211_MESH
2587 static ieee80211_rx_result
2588 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2589 {
2590         struct ieee80211_hdr *fwd_hdr, *hdr;
2591         struct ieee80211_tx_info *info;
2592         struct ieee80211s_hdr *mesh_hdr;
2593         struct sk_buff *skb = rx->skb, *fwd_skb;
2594         struct ieee80211_local *local = rx->local;
2595         struct ieee80211_sub_if_data *sdata = rx->sdata;
2596         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2597         u16 ac, q, hdrlen;
2598
2599         hdr = (struct ieee80211_hdr *) skb->data;
2600         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2601
2602         /* make sure fixed part of mesh header is there, also checks skb len */
2603         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2604                 return RX_DROP_MONITOR;
2605
2606         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2607
2608         /* make sure full mesh header is there, also checks skb len */
2609         if (!pskb_may_pull(rx->skb,
2610                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2611                 return RX_DROP_MONITOR;
2612
2613         /* reload pointers */
2614         hdr = (struct ieee80211_hdr *) skb->data;
2615         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2616
2617         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2618                 return RX_DROP_MONITOR;
2619
2620         /* frame is in RMC, don't forward */
2621         if (ieee80211_is_data(hdr->frame_control) &&
2622             is_multicast_ether_addr(hdr->addr1) &&
2623             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2624                 return RX_DROP_MONITOR;
2625
2626         if (!ieee80211_is_data(hdr->frame_control))
2627                 return RX_CONTINUE;
2628
2629         if (!mesh_hdr->ttl)
2630                 return RX_DROP_MONITOR;
2631
2632         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2633                 struct mesh_path *mppath;
2634                 char *proxied_addr;
2635                 char *mpp_addr;
2636
2637                 if (is_multicast_ether_addr(hdr->addr1)) {
2638                         mpp_addr = hdr->addr3;
2639                         proxied_addr = mesh_hdr->eaddr1;
2640                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2641                             MESH_FLAGS_AE_A5_A6) {
2642                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2643                         mpp_addr = hdr->addr4;
2644                         proxied_addr = mesh_hdr->eaddr2;
2645                 } else {
2646                         return RX_DROP_MONITOR;
2647                 }
2648
2649                 rcu_read_lock();
2650                 mppath = mpp_path_lookup(sdata, proxied_addr);
2651                 if (!mppath) {
2652                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2653                 } else {
2654                         spin_lock_bh(&mppath->state_lock);
2655                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2656                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2657                         mppath->exp_time = jiffies;
2658                         spin_unlock_bh(&mppath->state_lock);
2659                 }
2660                 rcu_read_unlock();
2661         }
2662
2663         /* Frame has reached destination.  Don't forward */
2664         if (!is_multicast_ether_addr(hdr->addr1) &&
2665             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2666                 return RX_CONTINUE;
2667
2668         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2669         q = sdata->vif.hw_queue[ac];
2670         if (ieee80211_queue_stopped(&local->hw, q)) {
2671                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2672                 return RX_DROP_MONITOR;
2673         }
2674         skb_set_queue_mapping(skb, q);
2675
2676         if (!--mesh_hdr->ttl) {
2677                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2678                 goto out;
2679         }
2680
2681         if (!ifmsh->mshcfg.dot11MeshForwarding)
2682                 goto out;
2683
2684         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2685                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2686         if (!fwd_skb)
2687                 goto out;
2688
2689         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2690         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2691         info = IEEE80211_SKB_CB(fwd_skb);
2692         memset(info, 0, sizeof(*info));
2693         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2694         info->control.vif = &rx->sdata->vif;
2695         info->control.jiffies = jiffies;
2696         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2697                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2698                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2699                 /* update power mode indication when forwarding */
2700                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2701         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2702                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2703                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2704         } else {
2705                 /* unable to resolve next hop */
2706                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2707                                    fwd_hdr->addr3, 0,
2708                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2709                                    fwd_hdr->addr2);
2710                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2711                 kfree_skb(fwd_skb);
2712                 return RX_DROP_MONITOR;
2713         }
2714
2715         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2716         ieee80211_add_pending_skb(local, fwd_skb);
2717  out:
2718         if (is_multicast_ether_addr(hdr->addr1))
2719                 return RX_CONTINUE;
2720         return RX_DROP_MONITOR;
2721 }
2722 #endif
2723
2724 static ieee80211_rx_result debug_noinline
2725 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2726 {
2727         struct ieee80211_sub_if_data *sdata = rx->sdata;
2728         struct ieee80211_local *local = rx->local;
2729         struct net_device *dev = sdata->dev;
2730         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2731         __le16 fc = hdr->frame_control;
2732         bool port_control;
2733         int err;
2734
2735         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2736                 return RX_CONTINUE;
2737
2738         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2739                 return RX_DROP_MONITOR;
2740
2741         /*
2742          * Send unexpected-4addr-frame event to hostapd. For older versions,
2743          * also drop the frame to cooked monitor interfaces.
2744          */
2745         if (ieee80211_has_a4(hdr->frame_control) &&
2746             sdata->vif.type == NL80211_IFTYPE_AP) {
2747                 if (rx->sta &&
2748                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2749                         cfg80211_rx_unexpected_4addr_frame(
2750                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2751                 return RX_DROP_MONITOR;
2752         }
2753
2754         err = __ieee80211_data_to_8023(rx, &port_control);
2755         if (unlikely(err))
2756                 return RX_DROP_UNUSABLE;
2757
2758         if (!ieee80211_frame_allowed(rx, fc))
2759                 return RX_DROP_MONITOR;
2760
2761         /* directly handle TDLS channel switch requests/responses */
2762         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2763                                                 cpu_to_be16(ETH_P_TDLS))) {
2764                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2765
2766                 if (pskb_may_pull(rx->skb,
2767                                   offsetof(struct ieee80211_tdls_data, u)) &&
2768                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2769                     tf->category == WLAN_CATEGORY_TDLS &&
2770                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2771                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2772                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2773                         schedule_work(&local->tdls_chsw_work);
2774                         if (rx->sta)
2775                                 rx->sta->rx_stats.packets++;
2776
2777                         return RX_QUEUED;
2778                 }
2779         }
2780
2781         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2782             unlikely(port_control) && sdata->bss) {
2783                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2784                                      u.ap);
2785                 dev = sdata->dev;
2786                 rx->sdata = sdata;
2787         }
2788
2789         rx->skb->dev = dev;
2790
2791         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2792             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2793             !is_multicast_ether_addr(
2794                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2795             (!local->scanning &&
2796              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2797                 mod_timer(&local->dynamic_ps_timer, jiffies +
2798                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2799
2800         ieee80211_deliver_skb(rx);
2801
2802         return RX_QUEUED;
2803 }
2804
2805 static ieee80211_rx_result debug_noinline
2806 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2807 {
2808         struct sk_buff *skb = rx->skb;
2809         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2810         struct tid_ampdu_rx *tid_agg_rx;
2811         u16 start_seq_num;
2812         u16 tid;
2813
2814         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2815                 return RX_CONTINUE;
2816
2817         if (ieee80211_is_back_req(bar->frame_control)) {
2818                 struct {
2819                         __le16 control, start_seq_num;
2820                 } __packed bar_data;
2821                 struct ieee80211_event event = {
2822                         .type = BAR_RX_EVENT,
2823                 };
2824
2825                 if (!rx->sta)
2826                         return RX_DROP_MONITOR;
2827
2828                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2829                                   &bar_data, sizeof(bar_data)))
2830                         return RX_DROP_MONITOR;
2831
2832                 tid = le16_to_cpu(bar_data.control) >> 12;
2833
2834                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2835                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2836                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2837                                              WLAN_BACK_RECIPIENT,
2838                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2839
2840                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2841                 if (!tid_agg_rx)
2842                         return RX_DROP_MONITOR;
2843
2844                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2845                 event.u.ba.tid = tid;
2846                 event.u.ba.ssn = start_seq_num;
2847                 event.u.ba.sta = &rx->sta->sta;
2848
2849                 /* reset session timer */
2850                 if (tid_agg_rx->timeout)
2851                         mod_timer(&tid_agg_rx->session_timer,
2852                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2853
2854                 spin_lock(&tid_agg_rx->reorder_lock);
2855                 /* release stored frames up to start of BAR */
2856                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2857                                                  start_seq_num, frames);
2858                 spin_unlock(&tid_agg_rx->reorder_lock);
2859
2860                 drv_event_callback(rx->local, rx->sdata, &event);
2861
2862                 kfree_skb(skb);
2863                 return RX_QUEUED;
2864         }
2865
2866         /*
2867          * After this point, we only want management frames,
2868          * so we can drop all remaining control frames to
2869          * cooked monitor interfaces.
2870          */
2871         return RX_DROP_MONITOR;
2872 }
2873
2874 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2875                                            struct ieee80211_mgmt *mgmt,
2876                                            size_t len)
2877 {
2878         struct ieee80211_local *local = sdata->local;
2879         struct sk_buff *skb;
2880         struct ieee80211_mgmt *resp;
2881
2882         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2883                 /* Not to own unicast address */
2884                 return;
2885         }
2886
2887         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2888             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2889                 /* Not from the current AP or not associated yet. */
2890                 return;
2891         }
2892
2893         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2894                 /* Too short SA Query request frame */
2895                 return;
2896         }
2897
2898         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2899         if (skb == NULL)
2900                 return;
2901
2902         skb_reserve(skb, local->hw.extra_tx_headroom);
2903         resp = skb_put_zero(skb, 24);
2904         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2905         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2906         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2907         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2908                                           IEEE80211_STYPE_ACTION);
2909         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2910         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2911         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2912         memcpy(resp->u.action.u.sa_query.trans_id,
2913                mgmt->u.action.u.sa_query.trans_id,
2914                WLAN_SA_QUERY_TR_ID_LEN);
2915
2916         ieee80211_tx_skb(sdata, skb);
2917 }
2918
2919 static ieee80211_rx_result debug_noinline
2920 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2921 {
2922         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2923         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2924
2925         /*
2926          * From here on, look only at management frames.
2927          * Data and control frames are already handled,
2928          * and unknown (reserved) frames are useless.
2929          */
2930         if (rx->skb->len < 24)
2931                 return RX_DROP_MONITOR;
2932
2933         if (!ieee80211_is_mgmt(mgmt->frame_control))
2934                 return RX_DROP_MONITOR;
2935
2936         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2937             ieee80211_is_beacon(mgmt->frame_control) &&
2938             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2939                 int sig = 0;
2940
2941                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2942                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2943                         sig = status->signal;
2944
2945                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2946                                             rx->skb->data, rx->skb->len,
2947                                             status->freq, sig);
2948                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2949         }
2950
2951         if (ieee80211_drop_unencrypted_mgmt(rx))
2952                 return RX_DROP_UNUSABLE;
2953
2954         return RX_CONTINUE;
2955 }
2956
2957 static ieee80211_rx_result debug_noinline
2958 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2959 {
2960         struct ieee80211_local *local = rx->local;
2961         struct ieee80211_sub_if_data *sdata = rx->sdata;
2962         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2963         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2964         int len = rx->skb->len;
2965
2966         if (!ieee80211_is_action(mgmt->frame_control))
2967                 return RX_CONTINUE;
2968
2969         /* drop too small frames */
2970         if (len < IEEE80211_MIN_ACTION_SIZE)
2971                 return RX_DROP_UNUSABLE;
2972
2973         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2974             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2975             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2976                 return RX_DROP_UNUSABLE;
2977
2978         switch (mgmt->u.action.category) {
2979         case WLAN_CATEGORY_HT:
2980                 /* reject HT action frames from stations not supporting HT */
2981                 if (!rx->sta->sta.ht_cap.ht_supported)
2982                         goto invalid;
2983
2984                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2985                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2986                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2987                     sdata->vif.type != NL80211_IFTYPE_AP &&
2988                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2989                         break;
2990
2991                 /* verify action & smps_control/chanwidth are present */
2992                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2993                         goto invalid;
2994
2995                 switch (mgmt->u.action.u.ht_smps.action) {
2996                 case WLAN_HT_ACTION_SMPS: {
2997                         struct ieee80211_supported_band *sband;
2998                         enum ieee80211_smps_mode smps_mode;
2999                         struct sta_opmode_info sta_opmode = {};
3000
3001                         /* convert to HT capability */
3002                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3003                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3004                                 smps_mode = IEEE80211_SMPS_OFF;
3005                                 break;
3006                         case WLAN_HT_SMPS_CONTROL_STATIC:
3007                                 smps_mode = IEEE80211_SMPS_STATIC;
3008                                 break;
3009                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3010                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3011                                 break;
3012                         default:
3013                                 goto invalid;
3014                         }
3015
3016                         /* if no change do nothing */
3017                         if (rx->sta->sta.smps_mode == smps_mode)
3018                                 goto handled;
3019                         rx->sta->sta.smps_mode = smps_mode;
3020                         sta_opmode.smps_mode =
3021                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3022                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3023
3024                         sband = rx->local->hw.wiphy->bands[status->band];
3025
3026                         rate_control_rate_update(local, sband, rx->sta,
3027                                                  IEEE80211_RC_SMPS_CHANGED);
3028                         cfg80211_sta_opmode_change_notify(sdata->dev,
3029                                                           rx->sta->addr,
3030                                                           &sta_opmode,
3031                                                           GFP_KERNEL);
3032                         goto handled;
3033                 }
3034                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3035                         struct ieee80211_supported_band *sband;
3036                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3037                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3038                         struct sta_opmode_info sta_opmode = {};
3039
3040                         /* If it doesn't support 40 MHz it can't change ... */
3041                         if (!(rx->sta->sta.ht_cap.cap &
3042                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3043                                 goto handled;
3044
3045                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3046                                 max_bw = IEEE80211_STA_RX_BW_20;
3047                         else
3048                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3049
3050                         /* set cur_max_bandwidth and recalc sta bw */
3051                         rx->sta->cur_max_bandwidth = max_bw;
3052                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3053
3054                         if (rx->sta->sta.bandwidth == new_bw)
3055                                 goto handled;
3056
3057                         rx->sta->sta.bandwidth = new_bw;
3058                         sband = rx->local->hw.wiphy->bands[status->band];
3059                         sta_opmode.bw =
3060                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3061                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3062
3063                         rate_control_rate_update(local, sband, rx->sta,
3064                                                  IEEE80211_RC_BW_CHANGED);
3065                         cfg80211_sta_opmode_change_notify(sdata->dev,
3066                                                           rx->sta->addr,
3067                                                           &sta_opmode,
3068                                                           GFP_KERNEL);
3069                         goto handled;
3070                 }
3071                 default:
3072                         goto invalid;
3073                 }
3074
3075                 break;
3076         case WLAN_CATEGORY_PUBLIC:
3077                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3078                         goto invalid;
3079                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3080                         break;
3081                 if (!rx->sta)
3082                         break;
3083                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3084                         break;
3085                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3086                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3087                         break;
3088                 if (len < offsetof(struct ieee80211_mgmt,
3089                                    u.action.u.ext_chan_switch.variable))
3090                         goto invalid;
3091                 goto queue;
3092         case WLAN_CATEGORY_VHT:
3093                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3094                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3095                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3096                     sdata->vif.type != NL80211_IFTYPE_AP &&
3097                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3098                         break;
3099
3100                 /* verify action code is present */
3101                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3102                         goto invalid;
3103
3104                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3105                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3106                         /* verify opmode is present */
3107                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3108                                 goto invalid;
3109                         goto queue;
3110                 }
3111                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3112                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3113                                 goto invalid;
3114                         goto queue;
3115                 }
3116                 default:
3117                         break;
3118                 }
3119                 break;
3120         case WLAN_CATEGORY_BACK:
3121                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3122                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3123                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3124                     sdata->vif.type != NL80211_IFTYPE_AP &&
3125                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3126                         break;
3127
3128                 /* verify action_code is present */
3129                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3130                         break;
3131
3132                 switch (mgmt->u.action.u.addba_req.action_code) {
3133                 case WLAN_ACTION_ADDBA_REQ:
3134                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3135                                    sizeof(mgmt->u.action.u.addba_req)))
3136                                 goto invalid;
3137                         break;
3138                 case WLAN_ACTION_ADDBA_RESP:
3139                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3140                                    sizeof(mgmt->u.action.u.addba_resp)))
3141                                 goto invalid;
3142                         break;
3143                 case WLAN_ACTION_DELBA:
3144                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3145                                    sizeof(mgmt->u.action.u.delba)))
3146                                 goto invalid;
3147                         break;
3148                 default:
3149                         goto invalid;
3150                 }
3151
3152                 goto queue;
3153         case WLAN_CATEGORY_SPECTRUM_MGMT:
3154                 /* verify action_code is present */
3155                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3156                         break;
3157
3158                 switch (mgmt->u.action.u.measurement.action_code) {
3159                 case WLAN_ACTION_SPCT_MSR_REQ:
3160                         if (status->band != NL80211_BAND_5GHZ)
3161                                 break;
3162
3163                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3164                                    sizeof(mgmt->u.action.u.measurement)))
3165                                 break;
3166
3167                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3168                                 break;
3169
3170                         ieee80211_process_measurement_req(sdata, mgmt, len);
3171                         goto handled;
3172                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3173                         u8 *bssid;
3174                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3175                                    sizeof(mgmt->u.action.u.chan_switch)))
3176                                 break;
3177
3178                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3179                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3180                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3181                                 break;
3182
3183                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3184                                 bssid = sdata->u.mgd.bssid;
3185                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3186                                 bssid = sdata->u.ibss.bssid;
3187                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3188                                 bssid = mgmt->sa;
3189                         else
3190                                 break;
3191
3192                         if (!ether_addr_equal(mgmt->bssid, bssid))
3193                                 break;
3194
3195                         goto queue;
3196                         }
3197                 }
3198                 break;
3199         case WLAN_CATEGORY_SA_QUERY:
3200                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3201                            sizeof(mgmt->u.action.u.sa_query)))
3202                         break;
3203
3204                 switch (mgmt->u.action.u.sa_query.action) {
3205                 case WLAN_ACTION_SA_QUERY_REQUEST:
3206                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3207                                 break;
3208                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3209                         goto handled;
3210                 }
3211                 break;
3212         case WLAN_CATEGORY_SELF_PROTECTED:
3213                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3214                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3215                         break;
3216
3217                 switch (mgmt->u.action.u.self_prot.action_code) {
3218                 case WLAN_SP_MESH_PEERING_OPEN:
3219                 case WLAN_SP_MESH_PEERING_CLOSE:
3220                 case WLAN_SP_MESH_PEERING_CONFIRM:
3221                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3222                                 goto invalid;
3223                         if (sdata->u.mesh.user_mpm)
3224                                 /* userspace handles this frame */
3225                                 break;
3226                         goto queue;
3227                 case WLAN_SP_MGK_INFORM:
3228                 case WLAN_SP_MGK_ACK:
3229                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3230                                 goto invalid;
3231                         break;
3232                 }
3233                 break;
3234         case WLAN_CATEGORY_MESH_ACTION:
3235                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3236                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3237                         break;
3238
3239                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3240                         break;
3241                 if (mesh_action_is_path_sel(mgmt) &&
3242                     !mesh_path_sel_is_hwmp(sdata))
3243                         break;
3244                 goto queue;
3245         }
3246
3247         return RX_CONTINUE;
3248
3249  invalid:
3250         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3251         /* will return in the next handlers */
3252         return RX_CONTINUE;
3253
3254  handled:
3255         if (rx->sta)
3256                 rx->sta->rx_stats.packets++;
3257         dev_kfree_skb(rx->skb);
3258         return RX_QUEUED;
3259
3260  queue:
3261         skb_queue_tail(&sdata->skb_queue, rx->skb);
3262         ieee80211_queue_work(&local->hw, &sdata->work);
3263         if (rx->sta)
3264                 rx->sta->rx_stats.packets++;
3265         return RX_QUEUED;
3266 }
3267
3268 static ieee80211_rx_result debug_noinline
3269 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3270 {
3271         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3272         int sig = 0;
3273
3274         /* skip known-bad action frames and return them in the next handler */
3275         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3276                 return RX_CONTINUE;
3277
3278         /*
3279          * Getting here means the kernel doesn't know how to handle
3280          * it, but maybe userspace does ... include returned frames
3281          * so userspace can register for those to know whether ones
3282          * it transmitted were processed or returned.
3283          */
3284
3285         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3286             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3287                 sig = status->signal;
3288
3289         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3290                              rx->skb->data, rx->skb->len, 0)) {
3291                 if (rx->sta)
3292                         rx->sta->rx_stats.packets++;
3293                 dev_kfree_skb(rx->skb);
3294                 return RX_QUEUED;
3295         }
3296
3297         return RX_CONTINUE;
3298 }
3299
3300 static ieee80211_rx_result debug_noinline
3301 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3302 {
3303         struct ieee80211_local *local = rx->local;
3304         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3305         struct sk_buff *nskb;
3306         struct ieee80211_sub_if_data *sdata = rx->sdata;
3307         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3308
3309         if (!ieee80211_is_action(mgmt->frame_control))
3310                 return RX_CONTINUE;
3311
3312         /*
3313          * For AP mode, hostapd is responsible for handling any action
3314          * frames that we didn't handle, including returning unknown
3315          * ones. For all other modes we will return them to the sender,
3316          * setting the 0x80 bit in the action category, as required by
3317          * 802.11-2012 9.24.4.
3318          * Newer versions of hostapd shall also use the management frame
3319          * registration mechanisms, but older ones still use cooked
3320          * monitor interfaces so push all frames there.
3321          */
3322         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3323             (sdata->vif.type == NL80211_IFTYPE_AP ||
3324              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3325                 return RX_DROP_MONITOR;
3326
3327         if (is_multicast_ether_addr(mgmt->da))
3328                 return RX_DROP_MONITOR;
3329
3330         /* do not return rejected action frames */
3331         if (mgmt->u.action.category & 0x80)
3332                 return RX_DROP_UNUSABLE;
3333
3334         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3335                                GFP_ATOMIC);
3336         if (nskb) {
3337                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3338
3339                 nmgmt->u.action.category |= 0x80;
3340                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3341                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3342
3343                 memset(nskb->cb, 0, sizeof(nskb->cb));
3344
3345                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3346                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3347
3348                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3349                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3350                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3351                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3352                                 info->hw_queue =
3353                                         local->hw.offchannel_tx_hw_queue;
3354                 }
3355
3356                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3357                                             status->band, 0);
3358         }
3359         dev_kfree_skb(rx->skb);
3360         return RX_QUEUED;
3361 }
3362
3363 static ieee80211_rx_result debug_noinline
3364 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3365 {
3366         struct ieee80211_sub_if_data *sdata = rx->sdata;
3367         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3368         __le16 stype;
3369
3370         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3371
3372         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3373             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3374             sdata->vif.type != NL80211_IFTYPE_OCB &&
3375             sdata->vif.type != NL80211_IFTYPE_STATION)
3376                 return RX_DROP_MONITOR;
3377
3378         switch (stype) {
3379         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3380         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3381         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3382                 /* process for all: mesh, mlme, ibss */
3383                 break;
3384         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3385         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3386         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3387         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3388                 if (is_multicast_ether_addr(mgmt->da) &&
3389                     !is_broadcast_ether_addr(mgmt->da))
3390                         return RX_DROP_MONITOR;
3391
3392                 /* process only for station */
3393                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3394                         return RX_DROP_MONITOR;
3395                 break;
3396         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3397                 /* process only for ibss and mesh */
3398                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3399                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3400                         return RX_DROP_MONITOR;
3401                 break;
3402         default:
3403                 return RX_DROP_MONITOR;
3404         }
3405
3406         /* queue up frame and kick off work to process it */
3407         skb_queue_tail(&sdata->skb_queue, rx->skb);
3408         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3409         if (rx->sta)
3410                 rx->sta->rx_stats.packets++;
3411
3412         return RX_QUEUED;
3413 }
3414
3415 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3416                                         struct ieee80211_rate *rate)
3417 {
3418         struct ieee80211_sub_if_data *sdata;
3419         struct ieee80211_local *local = rx->local;
3420         struct sk_buff *skb = rx->skb, *skb2;
3421         struct net_device *prev_dev = NULL;
3422         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3423         int needed_headroom;
3424
3425         /*
3426          * If cooked monitor has been processed already, then
3427          * don't do it again. If not, set the flag.
3428          */
3429         if (rx->flags & IEEE80211_RX_CMNTR)
3430                 goto out_free_skb;
3431         rx->flags |= IEEE80211_RX_CMNTR;
3432
3433         /* If there are no cooked monitor interfaces, just free the SKB */
3434         if (!local->cooked_mntrs)
3435                 goto out_free_skb;
3436
3437         /* vendor data is long removed here */
3438         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3439         /* room for the radiotap header based on driver features */
3440         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3441
3442         if (skb_headroom(skb) < needed_headroom &&
3443             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3444                 goto out_free_skb;
3445
3446         /* prepend radiotap information */
3447         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3448                                          false);
3449
3450         skb_reset_mac_header(skb);
3451         skb->ip_summed = CHECKSUM_UNNECESSARY;
3452         skb->pkt_type = PACKET_OTHERHOST;
3453         skb->protocol = htons(ETH_P_802_2);
3454
3455         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3456                 if (!ieee80211_sdata_running(sdata))
3457                         continue;
3458
3459                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3460                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3461                         continue;
3462
3463                 if (prev_dev) {
3464                         skb2 = skb_clone(skb, GFP_ATOMIC);
3465                         if (skb2) {
3466                                 skb2->dev = prev_dev;
3467                                 netif_receive_skb(skb2);
3468                         }
3469                 }
3470
3471                 prev_dev = sdata->dev;
3472                 ieee80211_rx_stats(sdata->dev, skb->len);
3473         }
3474
3475         if (prev_dev) {
3476                 skb->dev = prev_dev;
3477                 netif_receive_skb(skb);
3478                 return;
3479         }
3480
3481  out_free_skb:
3482         dev_kfree_skb(skb);
3483 }
3484
3485 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3486                                          ieee80211_rx_result res)
3487 {
3488         switch (res) {
3489         case RX_DROP_MONITOR:
3490                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3491                 if (rx->sta)
3492                         rx->sta->rx_stats.dropped++;
3493                 /* fall through */
3494         case RX_CONTINUE: {
3495                 struct ieee80211_rate *rate = NULL;
3496                 struct ieee80211_supported_band *sband;
3497                 struct ieee80211_rx_status *status;
3498
3499                 status = IEEE80211_SKB_RXCB((rx->skb));
3500
3501                 sband = rx->local->hw.wiphy->bands[status->band];
3502                 if (status->encoding == RX_ENC_LEGACY)
3503                         rate = &sband->bitrates[status->rate_idx];
3504
3505                 ieee80211_rx_cooked_monitor(rx, rate);
3506                 break;
3507                 }
3508         case RX_DROP_UNUSABLE:
3509                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3510                 if (rx->sta)
3511                         rx->sta->rx_stats.dropped++;
3512                 dev_kfree_skb(rx->skb);
3513                 break;
3514         case RX_QUEUED:
3515                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3516                 break;
3517         }
3518 }
3519
3520 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3521                                   struct sk_buff_head *frames)
3522 {
3523         ieee80211_rx_result res = RX_DROP_MONITOR;
3524         struct sk_buff *skb;
3525
3526 #define CALL_RXH(rxh)                   \
3527         do {                            \
3528                 res = rxh(rx);          \
3529                 if (res != RX_CONTINUE) \
3530                         goto rxh_next;  \
3531         } while (0)
3532
3533         /* Lock here to avoid hitting all of the data used in the RX
3534          * path (e.g. key data, station data, ...) concurrently when
3535          * a frame is released from the reorder buffer due to timeout
3536          * from the timer, potentially concurrently with RX from the
3537          * driver.
3538          */
3539         spin_lock_bh(&rx->local->rx_path_lock);
3540
3541         while ((skb = __skb_dequeue(frames))) {
3542                 /*
3543                  * all the other fields are valid across frames
3544                  * that belong to an aMPDU since they are on the
3545                  * same TID from the same station
3546                  */
3547                 rx->skb = skb;
3548
3549                 CALL_RXH(ieee80211_rx_h_check_more_data);
3550                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3551                 CALL_RXH(ieee80211_rx_h_sta_process);
3552                 CALL_RXH(ieee80211_rx_h_decrypt);
3553                 CALL_RXH(ieee80211_rx_h_defragment);
3554                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3555                 /* must be after MMIC verify so header is counted in MPDU mic */
3556 #ifdef CONFIG_MAC80211_MESH
3557                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3558                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3559 #endif
3560                 CALL_RXH(ieee80211_rx_h_amsdu);
3561                 CALL_RXH(ieee80211_rx_h_data);
3562
3563                 /* special treatment -- needs the queue */
3564                 res = ieee80211_rx_h_ctrl(rx, frames);
3565                 if (res != RX_CONTINUE)
3566                         goto rxh_next;
3567
3568                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3569                 CALL_RXH(ieee80211_rx_h_action);
3570                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3571                 CALL_RXH(ieee80211_rx_h_action_return);
3572                 CALL_RXH(ieee80211_rx_h_mgmt);
3573
3574  rxh_next:
3575                 ieee80211_rx_handlers_result(rx, res);
3576
3577 #undef CALL_RXH
3578         }
3579
3580         spin_unlock_bh(&rx->local->rx_path_lock);
3581 }
3582
3583 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3584 {
3585         struct sk_buff_head reorder_release;
3586         ieee80211_rx_result res = RX_DROP_MONITOR;
3587
3588         __skb_queue_head_init(&reorder_release);
3589
3590 #define CALL_RXH(rxh)                   \
3591         do {                            \
3592                 res = rxh(rx);          \
3593                 if (res != RX_CONTINUE) \
3594                         goto rxh_next;  \
3595         } while (0)
3596
3597         CALL_RXH(ieee80211_rx_h_check_dup);
3598         CALL_RXH(ieee80211_rx_h_check);
3599
3600         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3601
3602         ieee80211_rx_handlers(rx, &reorder_release);
3603         return;
3604
3605  rxh_next:
3606         ieee80211_rx_handlers_result(rx, res);
3607
3608 #undef CALL_RXH
3609 }
3610
3611 /*
3612  * This function makes calls into the RX path, therefore
3613  * it has to be invoked under RCU read lock.
3614  */
3615 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3616 {
3617         struct sk_buff_head frames;
3618         struct ieee80211_rx_data rx = {
3619                 .sta = sta,
3620                 .sdata = sta->sdata,
3621                 .local = sta->local,
3622                 /* This is OK -- must be QoS data frame */
3623                 .security_idx = tid,
3624                 .seqno_idx = tid,
3625                 .napi = NULL, /* must be NULL to not have races */
3626         };
3627         struct tid_ampdu_rx *tid_agg_rx;
3628
3629         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3630         if (!tid_agg_rx)
3631                 return;
3632
3633         __skb_queue_head_init(&frames);
3634
3635         spin_lock(&tid_agg_rx->reorder_lock);
3636         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3637         spin_unlock(&tid_agg_rx->reorder_lock);
3638
3639         if (!skb_queue_empty(&frames)) {
3640                 struct ieee80211_event event = {
3641                         .type = BA_FRAME_TIMEOUT,
3642                         .u.ba.tid = tid,
3643                         .u.ba.sta = &sta->sta,
3644                 };
3645                 drv_event_callback(rx.local, rx.sdata, &event);
3646         }
3647
3648         ieee80211_rx_handlers(&rx, &frames);
3649 }
3650
3651 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3652                                           u16 ssn, u64 filtered,
3653                                           u16 received_mpdus)
3654 {
3655         struct sta_info *sta;
3656         struct tid_ampdu_rx *tid_agg_rx;
3657         struct sk_buff_head frames;
3658         struct ieee80211_rx_data rx = {
3659                 /* This is OK -- must be QoS data frame */
3660                 .security_idx = tid,
3661                 .seqno_idx = tid,
3662         };
3663         int i, diff;
3664
3665         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3666                 return;
3667
3668         __skb_queue_head_init(&frames);
3669
3670         sta = container_of(pubsta, struct sta_info, sta);
3671
3672         rx.sta = sta;
3673         rx.sdata = sta->sdata;
3674         rx.local = sta->local;
3675
3676         rcu_read_lock();
3677         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3678         if (!tid_agg_rx)
3679                 goto out;
3680
3681         spin_lock_bh(&tid_agg_rx->reorder_lock);
3682
3683         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3684                 int release;
3685
3686                 /* release all frames in the reorder buffer */
3687                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3688                            IEEE80211_SN_MODULO;
3689                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3690                                                  release, &frames);
3691                 /* update ssn to match received ssn */
3692                 tid_agg_rx->head_seq_num = ssn;
3693         } else {
3694                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3695                                                  &frames);
3696         }
3697
3698         /* handle the case that received ssn is behind the mac ssn.
3699          * it can be tid_agg_rx->buf_size behind and still be valid */
3700         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3701         if (diff >= tid_agg_rx->buf_size) {
3702                 tid_agg_rx->reorder_buf_filtered = 0;
3703                 goto release;
3704         }
3705         filtered = filtered >> diff;
3706         ssn += diff;
3707
3708         /* update bitmap */
3709         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3710                 int index = (ssn + i) % tid_agg_rx->buf_size;
3711
3712                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3713                 if (filtered & BIT_ULL(i))
3714                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3715         }
3716
3717         /* now process also frames that the filter marking released */
3718         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3719
3720 release:
3721         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3722
3723         ieee80211_rx_handlers(&rx, &frames);
3724
3725  out:
3726         rcu_read_unlock();
3727 }
3728 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3729
3730 /* main receive path */
3731
3732 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3733 {
3734         struct ieee80211_sub_if_data *sdata = rx->sdata;
3735         struct sk_buff *skb = rx->skb;
3736         struct ieee80211_hdr *hdr = (void *)skb->data;
3737         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3738         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3739         bool multicast = is_multicast_ether_addr(hdr->addr1);
3740
3741         switch (sdata->vif.type) {
3742         case NL80211_IFTYPE_STATION:
3743                 if (!bssid && !sdata->u.mgd.use_4addr)
3744                         return false;
3745                 if (multicast)
3746                         return true;
3747                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3748         case NL80211_IFTYPE_ADHOC:
3749                 if (!bssid)
3750                         return false;
3751                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3752                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3753                         return false;
3754                 if (ieee80211_is_beacon(hdr->frame_control))
3755                         return true;
3756                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3757                         return false;
3758                 if (!multicast &&
3759                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3760                         return false;
3761                 if (!rx->sta) {
3762                         int rate_idx;
3763                         if (status->encoding != RX_ENC_LEGACY)
3764                                 rate_idx = 0; /* TODO: HT/VHT rates */
3765                         else
3766                                 rate_idx = status->rate_idx;
3767                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3768                                                  BIT(rate_idx));
3769                 }
3770                 return true;
3771         case NL80211_IFTYPE_OCB:
3772                 if (!bssid)
3773                         return false;
3774                 if (!ieee80211_is_data_present(hdr->frame_control))
3775                         return false;
3776                 if (!is_broadcast_ether_addr(bssid))
3777                         return false;
3778                 if (!multicast &&
3779                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3780                         return false;
3781                 if (!rx->sta) {
3782                         int rate_idx;
3783                         if (status->encoding != RX_ENC_LEGACY)
3784                                 rate_idx = 0; /* TODO: HT rates */
3785                         else
3786                                 rate_idx = status->rate_idx;
3787                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3788                                                 BIT(rate_idx));
3789                 }
3790                 return true;
3791         case NL80211_IFTYPE_MESH_POINT:
3792                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3793                         return false;
3794                 if (multicast)
3795                         return true;
3796                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3797         case NL80211_IFTYPE_AP_VLAN:
3798         case NL80211_IFTYPE_AP:
3799                 if (!bssid)
3800                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3801
3802                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3803                         /*
3804                          * Accept public action frames even when the
3805                          * BSSID doesn't match, this is used for P2P
3806                          * and location updates. Note that mac80211
3807                          * itself never looks at these frames.
3808                          */
3809                         if (!multicast &&
3810                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3811                                 return false;
3812                         if (ieee80211_is_public_action(hdr, skb->len))
3813                                 return true;
3814                         return ieee80211_is_beacon(hdr->frame_control);
3815                 }
3816
3817                 if (!ieee80211_has_tods(hdr->frame_control)) {
3818                         /* ignore data frames to TDLS-peers */
3819                         if (ieee80211_is_data(hdr->frame_control))
3820                                 return false;
3821                         /* ignore action frames to TDLS-peers */
3822                         if (ieee80211_is_action(hdr->frame_control) &&
3823                             !is_broadcast_ether_addr(bssid) &&
3824                             !ether_addr_equal(bssid, hdr->addr1))
3825                                 return false;
3826                 }
3827
3828                 /*
3829                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3830                  * the BSSID - we've checked that already but may have accepted
3831                  * the wildcard (ff:ff:ff:ff:ff:ff).
3832                  *
3833                  * It also says:
3834                  *      The BSSID of the Data frame is determined as follows:
3835                  *      a) If the STA is contained within an AP or is associated
3836                  *         with an AP, the BSSID is the address currently in use
3837                  *         by the STA contained in the AP.
3838                  *
3839                  * So we should not accept data frames with an address that's
3840                  * multicast.
3841                  *
3842                  * Accepting it also opens a security problem because stations
3843                  * could encrypt it with the GTK and inject traffic that way.
3844                  */
3845                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3846                         return false;
3847
3848                 return true;
3849         case NL80211_IFTYPE_WDS:
3850                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3851                         return false;
3852                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3853         case NL80211_IFTYPE_P2P_DEVICE:
3854                 return ieee80211_is_public_action(hdr, skb->len) ||
3855                        ieee80211_is_probe_req(hdr->frame_control) ||
3856                        ieee80211_is_probe_resp(hdr->frame_control) ||
3857                        ieee80211_is_beacon(hdr->frame_control);
3858         case NL80211_IFTYPE_NAN:
3859                 /* Currently no frames on NAN interface are allowed */
3860                 return false;
3861         default:
3862                 break;
3863         }
3864
3865         WARN_ON_ONCE(1);
3866         return false;
3867 }
3868
3869 void ieee80211_check_fast_rx(struct sta_info *sta)
3870 {
3871         struct ieee80211_sub_if_data *sdata = sta->sdata;
3872         struct ieee80211_local *local = sdata->local;
3873         struct ieee80211_key *key;
3874         struct ieee80211_fast_rx fastrx = {
3875                 .dev = sdata->dev,
3876                 .vif_type = sdata->vif.type,
3877                 .control_port_protocol = sdata->control_port_protocol,
3878         }, *old, *new = NULL;
3879         bool assign = false;
3880
3881         /* use sparse to check that we don't return without updating */
3882         __acquire(check_fast_rx);
3883
3884         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3885         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3886         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3887         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3888
3889         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3890
3891         /* fast-rx doesn't do reordering */
3892         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3893             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3894                 goto clear;
3895
3896         switch (sdata->vif.type) {
3897         case NL80211_IFTYPE_STATION:
3898                 if (sta->sta.tdls) {
3899                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3900                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3901                         fastrx.expected_ds_bits = 0;
3902                 } else {
3903                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3904                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3905                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3906                         fastrx.expected_ds_bits =
3907                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3908                 }
3909
3910                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3911                         fastrx.expected_ds_bits |=
3912                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3913                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3914                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3915                 }
3916
3917                 if (!sdata->u.mgd.powersave)
3918                         break;
3919
3920                 /* software powersave is a huge mess, avoid all of it */
3921                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3922                         goto clear;
3923                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3924                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3925                         goto clear;
3926                 break;
3927         case NL80211_IFTYPE_AP_VLAN:
3928         case NL80211_IFTYPE_AP:
3929                 /* parallel-rx requires this, at least with calls to
3930                  * ieee80211_sta_ps_transition()
3931                  */
3932                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3933                         goto clear;
3934                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3935                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3936                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3937
3938                 fastrx.internal_forward =
3939                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3940                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3941                          !sdata->u.vlan.sta);
3942
3943                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3944                     sdata->u.vlan.sta) {
3945                         fastrx.expected_ds_bits |=
3946                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3947                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3948                         fastrx.internal_forward = 0;
3949                 }
3950
3951                 break;
3952         default:
3953                 goto clear;
3954         }
3955
3956         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3957                 goto clear;
3958
3959         rcu_read_lock();
3960         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3961         if (key) {
3962                 switch (key->conf.cipher) {
3963                 case WLAN_CIPHER_SUITE_TKIP:
3964                         /* we don't want to deal with MMIC in fast-rx */
3965                         goto clear_rcu;
3966                 case WLAN_CIPHER_SUITE_CCMP:
3967                 case WLAN_CIPHER_SUITE_CCMP_256:
3968                 case WLAN_CIPHER_SUITE_GCMP:
3969                 case WLAN_CIPHER_SUITE_GCMP_256:
3970                         break;
3971                 default:
3972                         /* we also don't want to deal with WEP or cipher scheme
3973                          * since those require looking up the key idx in the
3974                          * frame, rather than assuming the PTK is used
3975                          * (we need to revisit this once we implement the real
3976                          * PTK index, which is now valid in the spec, but we
3977                          * haven't implemented that part yet)
3978                          */
3979                         goto clear_rcu;
3980                 }
3981
3982                 fastrx.key = true;
3983                 fastrx.icv_len = key->conf.icv_len;
3984         }
3985
3986         assign = true;
3987  clear_rcu:
3988         rcu_read_unlock();
3989  clear:
3990         __release(check_fast_rx);
3991
3992         if (assign)
3993                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3994
3995         spin_lock_bh(&sta->lock);
3996         old = rcu_dereference_protected(sta->fast_rx, true);
3997         rcu_assign_pointer(sta->fast_rx, new);
3998         spin_unlock_bh(&sta->lock);
3999
4000         if (old)
4001                 kfree_rcu(old, rcu_head);
4002 }
4003
4004 void ieee80211_clear_fast_rx(struct sta_info *sta)
4005 {
4006         struct ieee80211_fast_rx *old;
4007
4008         spin_lock_bh(&sta->lock);
4009         old = rcu_dereference_protected(sta->fast_rx, true);
4010         RCU_INIT_POINTER(sta->fast_rx, NULL);
4011         spin_unlock_bh(&sta->lock);
4012
4013         if (old)
4014                 kfree_rcu(old, rcu_head);
4015 }
4016
4017 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4018 {
4019         struct ieee80211_local *local = sdata->local;
4020         struct sta_info *sta;
4021
4022         lockdep_assert_held(&local->sta_mtx);
4023
4024         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4025                 if (sdata != sta->sdata &&
4026                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4027                         continue;
4028                 ieee80211_check_fast_rx(sta);
4029         }
4030 }
4031
4032 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4033 {
4034         struct ieee80211_local *local = sdata->local;
4035
4036         mutex_lock(&local->sta_mtx);
4037         __ieee80211_check_fast_rx_iface(sdata);
4038         mutex_unlock(&local->sta_mtx);
4039 }
4040
4041 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4042                                      struct ieee80211_fast_rx *fast_rx)
4043 {
4044         struct sk_buff *skb = rx->skb;
4045         struct ieee80211_hdr *hdr = (void *)skb->data;
4046         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4047         struct sta_info *sta = rx->sta;
4048         int orig_len = skb->len;
4049         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4050         int snap_offs = hdrlen;
4051         struct {
4052                 u8 snap[sizeof(rfc1042_header)];
4053                 __be16 proto;
4054         } *payload __aligned(2);
4055         struct {
4056                 u8 da[ETH_ALEN];
4057                 u8 sa[ETH_ALEN];
4058         } addrs __aligned(2);
4059         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4060
4061         if (fast_rx->uses_rss)
4062                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4063
4064         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4065          * to a common data structure; drivers can implement that per queue
4066          * but we don't have that information in mac80211
4067          */
4068         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4069                 return false;
4070
4071 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4072
4073         /* If using encryption, we also need to have:
4074          *  - PN_VALIDATED: similar, but the implementation is tricky
4075          *  - DECRYPTED: necessary for PN_VALIDATED
4076          */
4077         if (fast_rx->key &&
4078             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4079                 return false;
4080
4081         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4082                 return false;
4083
4084         if (unlikely(ieee80211_is_frag(hdr)))
4085                 return false;
4086
4087         /* Since our interface address cannot be multicast, this
4088          * implicitly also rejects multicast frames without the
4089          * explicit check.
4090          *
4091          * We shouldn't get any *data* frames not addressed to us
4092          * (AP mode will accept multicast *management* frames), but
4093          * punting here will make it go through the full checks in
4094          * ieee80211_accept_frame().
4095          */
4096         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4097                 return false;
4098
4099         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4100                                               IEEE80211_FCTL_TODS)) !=
4101             fast_rx->expected_ds_bits)
4102                 return false;
4103
4104         /* assign the key to drop unencrypted frames (later)
4105          * and strip the IV/MIC if necessary
4106          */
4107         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4108                 /* GCMP header length is the same */
4109                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4110         }
4111
4112         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4113                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4114                         goto drop;
4115
4116                 payload = (void *)(skb->data + snap_offs);
4117
4118                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4119                         return false;
4120
4121                 /* Don't handle these here since they require special code.
4122                  * Accept AARP and IPX even though they should come with a
4123                  * bridge-tunnel header - but if we get them this way then
4124                  * there's little point in discarding them.
4125                  */
4126                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4127                              payload->proto == fast_rx->control_port_protocol))
4128                         return false;
4129         }
4130
4131         /* after this point, don't punt to the slowpath! */
4132
4133         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4134             pskb_trim(skb, skb->len - fast_rx->icv_len))
4135                 goto drop;
4136
4137         if (unlikely(fast_rx->sta_notify)) {
4138                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4139                 fast_rx->sta_notify = false;
4140         }
4141
4142         /* statistics part of ieee80211_rx_h_sta_process() */
4143         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4144                 stats->last_signal = status->signal;
4145                 if (!fast_rx->uses_rss)
4146                         ewma_signal_add(&sta->rx_stats_avg.signal,
4147                                         -status->signal);
4148         }
4149
4150         if (status->chains) {
4151                 int i;
4152
4153                 stats->chains = status->chains;
4154                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4155                         int signal = status->chain_signal[i];
4156
4157                         if (!(status->chains & BIT(i)))
4158                                 continue;
4159
4160                         stats->chain_signal_last[i] = signal;
4161                         if (!fast_rx->uses_rss)
4162                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4163                                                 -signal);
4164                 }
4165         }
4166         /* end of statistics */
4167
4168         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4169                 goto drop;
4170
4171         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4172                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4173                     RX_QUEUED)
4174                         goto drop;
4175
4176                 return true;
4177         }
4178
4179         stats->last_rx = jiffies;
4180         stats->last_rate = sta_stats_encode_rate(status);
4181
4182         stats->fragments++;
4183         stats->packets++;
4184
4185         /* do the header conversion - first grab the addresses */
4186         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4187         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4188         /* remove the SNAP but leave the ethertype */
4189         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4190         /* push the addresses in front */
4191         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4192
4193         skb->dev = fast_rx->dev;
4194
4195         ieee80211_rx_stats(fast_rx->dev, skb->len);
4196
4197         /* The seqno index has the same property as needed
4198          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4199          * for non-QoS-data frames. Here we know it's a data
4200          * frame, so count MSDUs.
4201          */
4202         u64_stats_update_begin(&stats->syncp);
4203         stats->msdu[rx->seqno_idx]++;
4204         stats->bytes += orig_len;
4205         u64_stats_update_end(&stats->syncp);
4206
4207         if (fast_rx->internal_forward) {
4208                 struct sk_buff *xmit_skb = NULL;
4209                 bool multicast = is_multicast_ether_addr(skb->data);
4210
4211                 if (multicast) {
4212                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4213                 } else if (sta_info_get(rx->sdata, skb->data)) {
4214                         xmit_skb = skb;
4215                         skb = NULL;
4216                 }
4217
4218                 if (xmit_skb) {
4219                         /*
4220                          * Send to wireless media and increase priority by 256
4221                          * to keep the received priority instead of
4222                          * reclassifying the frame (see cfg80211_classify8021d).
4223                          */
4224                         xmit_skb->priority += 256;
4225                         xmit_skb->protocol = htons(ETH_P_802_3);
4226                         skb_reset_network_header(xmit_skb);
4227                         skb_reset_mac_header(xmit_skb);
4228                         dev_queue_xmit(xmit_skb);
4229                 }
4230
4231                 if (!skb)
4232                         return true;
4233         }
4234
4235         /* deliver to local stack */
4236         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4237         memset(skb->cb, 0, sizeof(skb->cb));
4238         if (rx->napi)
4239                 napi_gro_receive(rx->napi, skb);
4240         else
4241                 netif_receive_skb(skb);
4242
4243         return true;
4244  drop:
4245         dev_kfree_skb(skb);
4246         stats->dropped++;
4247         return true;
4248 }
4249
4250 /*
4251  * This function returns whether or not the SKB
4252  * was destined for RX processing or not, which,
4253  * if consume is true, is equivalent to whether
4254  * or not the skb was consumed.
4255  */
4256 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4257                                             struct sk_buff *skb, bool consume)
4258 {
4259         struct ieee80211_local *local = rx->local;
4260         struct ieee80211_sub_if_data *sdata = rx->sdata;
4261
4262         rx->skb = skb;
4263
4264         /* See if we can do fast-rx; if we have to copy we already lost,
4265          * so punt in that case. We should never have to deliver a data
4266          * frame to multiple interfaces anyway.
4267          *
4268          * We skip the ieee80211_accept_frame() call and do the necessary
4269          * checking inside ieee80211_invoke_fast_rx().
4270          */
4271         if (consume && rx->sta) {
4272                 struct ieee80211_fast_rx *fast_rx;
4273
4274                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4275                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4276                         return true;
4277         }
4278
4279         if (!ieee80211_accept_frame(rx))
4280                 return false;
4281
4282         if (!consume) {
4283                 skb = skb_copy(skb, GFP_ATOMIC);
4284                 if (!skb) {
4285                         if (net_ratelimit())
4286                                 wiphy_debug(local->hw.wiphy,
4287                                         "failed to copy skb for %s\n",
4288                                         sdata->name);
4289                         return true;
4290                 }
4291
4292                 rx->skb = skb;
4293         }
4294
4295         ieee80211_invoke_rx_handlers(rx);
4296         return true;
4297 }
4298
4299 /*
4300  * This is the actual Rx frames handler. as it belongs to Rx path it must
4301  * be called with rcu_read_lock protection.
4302  */
4303 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4304                                          struct ieee80211_sta *pubsta,
4305                                          struct sk_buff *skb,
4306                                          struct napi_struct *napi)
4307 {
4308         struct ieee80211_local *local = hw_to_local(hw);
4309         struct ieee80211_sub_if_data *sdata;
4310         struct ieee80211_hdr *hdr;
4311         __le16 fc;
4312         struct ieee80211_rx_data rx;
4313         struct ieee80211_sub_if_data *prev;
4314         struct rhlist_head *tmp;
4315         int err = 0;
4316
4317         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4318         memset(&rx, 0, sizeof(rx));
4319         rx.skb = skb;
4320         rx.local = local;
4321         rx.napi = napi;
4322
4323         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4324                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4325
4326         if (ieee80211_is_mgmt(fc)) {
4327                 /* drop frame if too short for header */
4328                 if (skb->len < ieee80211_hdrlen(fc))
4329                         err = -ENOBUFS;
4330                 else
4331                         err = skb_linearize(skb);
4332         } else {
4333                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4334         }
4335
4336         if (err) {
4337                 dev_kfree_skb(skb);
4338                 return;
4339         }
4340
4341         hdr = (struct ieee80211_hdr *)skb->data;
4342         ieee80211_parse_qos(&rx);
4343         ieee80211_verify_alignment(&rx);
4344
4345         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4346                      ieee80211_is_beacon(hdr->frame_control)))
4347                 ieee80211_scan_rx(local, skb);
4348
4349         if (ieee80211_is_data(fc)) {
4350                 struct sta_info *sta, *prev_sta;
4351
4352                 if (pubsta) {
4353                         rx.sta = container_of(pubsta, struct sta_info, sta);
4354                         rx.sdata = rx.sta->sdata;
4355                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4356                                 return;
4357                         goto out;
4358                 }
4359
4360                 prev_sta = NULL;
4361
4362                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4363                         if (!prev_sta) {
4364                                 prev_sta = sta;
4365                                 continue;
4366                         }
4367
4368                         rx.sta = prev_sta;
4369                         rx.sdata = prev_sta->sdata;
4370                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4371
4372                         prev_sta = sta;
4373                 }
4374
4375                 if (prev_sta) {
4376                         rx.sta = prev_sta;
4377                         rx.sdata = prev_sta->sdata;
4378
4379                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4380                                 return;
4381                         goto out;
4382                 }
4383         }
4384
4385         prev = NULL;
4386
4387         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4388                 if (!ieee80211_sdata_running(sdata))
4389                         continue;
4390
4391                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4392                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4393                         continue;
4394
4395                 /*
4396                  * frame is destined for this interface, but if it's
4397                  * not also for the previous one we handle that after
4398                  * the loop to avoid copying the SKB once too much
4399                  */
4400
4401                 if (!prev) {
4402                         prev = sdata;
4403                         continue;
4404                 }
4405
4406                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4407                 rx.sdata = prev;
4408                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4409
4410                 prev = sdata;
4411         }
4412
4413         if (prev) {
4414                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4415                 rx.sdata = prev;
4416
4417                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4418                         return;
4419         }
4420
4421  out:
4422         dev_kfree_skb(skb);
4423 }
4424
4425 /*
4426  * This is the receive path handler. It is called by a low level driver when an
4427  * 802.11 MPDU is received from the hardware.
4428  */
4429 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4430                        struct sk_buff *skb, struct napi_struct *napi)
4431 {
4432         struct ieee80211_local *local = hw_to_local(hw);
4433         struct ieee80211_rate *rate = NULL;
4434         struct ieee80211_supported_band *sband;
4435         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4436
4437         WARN_ON_ONCE(softirq_count() == 0);
4438
4439         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4440                 goto drop;
4441
4442         sband = local->hw.wiphy->bands[status->band];
4443         if (WARN_ON(!sband))
4444                 goto drop;
4445
4446         /*
4447          * If we're suspending, it is possible although not too likely
4448          * that we'd be receiving frames after having already partially
4449          * quiesced the stack. We can't process such frames then since
4450          * that might, for example, cause stations to be added or other
4451          * driver callbacks be invoked.
4452          */
4453         if (unlikely(local->quiescing || local->suspended))
4454                 goto drop;
4455
4456         /* We might be during a HW reconfig, prevent Rx for the same reason */
4457         if (unlikely(local->in_reconfig))
4458                 goto drop;
4459
4460         /*
4461          * The same happens when we're not even started,
4462          * but that's worth a warning.
4463          */
4464         if (WARN_ON(!local->started))
4465                 goto drop;
4466
4467         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4468                 /*
4469                  * Validate the rate, unless a PLCP error means that
4470                  * we probably can't have a valid rate here anyway.
4471                  */
4472
4473                 switch (status->encoding) {
4474                 case RX_ENC_HT:
4475                         /*
4476                          * rate_idx is MCS index, which can be [0-76]
4477                          * as documented on:
4478                          *
4479                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4480                          *
4481                          * Anything else would be some sort of driver or
4482                          * hardware error. The driver should catch hardware
4483                          * errors.
4484                          */
4485                         if (WARN(status->rate_idx > 76,
4486                                  "Rate marked as an HT rate but passed "
4487                                  "status->rate_idx is not "
4488                                  "an MCS index [0-76]: %d (0x%02x)\n",
4489                                  status->rate_idx,
4490                                  status->rate_idx))
4491                                 goto drop;
4492                         break;
4493                 case RX_ENC_VHT:
4494                         if (WARN_ONCE(status->rate_idx > 9 ||
4495                                       !status->nss ||
4496                                       status->nss > 8,
4497                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4498                                       status->rate_idx, status->nss))
4499                                 goto drop;
4500                         break;
4501                 case RX_ENC_HE:
4502                         if (WARN_ONCE(status->rate_idx > 11 ||
4503                                       !status->nss ||
4504                                       status->nss > 8,
4505                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4506                                       status->rate_idx, status->nss))
4507                                 goto drop;
4508                         break;
4509                 default:
4510                         WARN_ON_ONCE(1);
4511                         /* fall through */
4512                 case RX_ENC_LEGACY:
4513                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4514                                 goto drop;
4515                         rate = &sband->bitrates[status->rate_idx];
4516                 }
4517         }
4518
4519         status->rx_flags = 0;
4520
4521         /*
4522          * key references and virtual interfaces are protected using RCU
4523          * and this requires that we are in a read-side RCU section during
4524          * receive processing
4525          */
4526         rcu_read_lock();
4527
4528         /*
4529          * Frames with failed FCS/PLCP checksum are not returned,
4530          * all other frames are returned without radiotap header
4531          * if it was previously present.
4532          * Also, frames with less than 16 bytes are dropped.
4533          */
4534         skb = ieee80211_rx_monitor(local, skb, rate);
4535         if (!skb) {
4536                 rcu_read_unlock();
4537                 return;
4538         }
4539
4540         ieee80211_tpt_led_trig_rx(local,
4541                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4542                         skb->len);
4543
4544         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4545
4546         rcu_read_unlock();
4547
4548         return;
4549  drop:
4550         kfree_skb(skb);
4551 }
4552 EXPORT_SYMBOL(ieee80211_rx_napi);
4553
4554 /* This is a version of the rx handler that can be called from hard irq
4555  * context. Post the skb on the queue and schedule the tasklet */
4556 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4557 {
4558         struct ieee80211_local *local = hw_to_local(hw);
4559
4560         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4561
4562         skb->pkt_type = IEEE80211_RX_MSG;
4563         skb_queue_tail(&local->skb_queue, skb);
4564         tasklet_schedule(&local->tasklet);
4565 }
4566 EXPORT_SYMBOL(ieee80211_rx_irqsafe);