net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/jiffies.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/export.h>
  23 #include <linux/bitops.h>
  24 #include <net/mac80211.h>
  25 #include <net/ieee80211_radiotap.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "led.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "rate.h"
  37
  38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  39 {
  40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  41
  42         u64_stats_update_begin(&tstats->syncp);
  43         tstats->rx_packets++;
  44         tstats->rx_bytes += len;
  45         u64_stats_update_end(&tstats->syncp);
  46 }
  47
  48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                                enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53         if (ieee80211_is_data(fc)) {
  54                 if (len < 24) /* drop incorrect hdr len (data) */
  55                         return NULL;
  56
  57                 if (ieee80211_has_a4(fc))
  58                         return NULL;
  59                 if (ieee80211_has_tods(fc))
  60                         return hdr->addr1;
  61                 if (ieee80211_has_fromds(fc))
  62                         return hdr->addr2;
  63
  64                 return hdr->addr3;
  65         }
  66
  67         if (ieee80211_is_mgmt(fc)) {
  68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  69                         return NULL;
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_ctl(fc)) {
  74                 if (ieee80211_is_pspoll(fc))
  75                         return hdr->addr1;
  76
  77                 if (ieee80211_is_back_req(fc)) {
  78                         switch (type) {
  79                         case NL80211_IFTYPE_STATION:
  80                                 return hdr->addr2;
  81                         case NL80211_IFTYPE_AP:
  82                         case NL80211_IFTYPE_AP_VLAN:
  83                                 return hdr->addr1;
  84                         default:
  85                                 break; /* fall through to the return */
  86                         }
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94  * monitor mode reception
  95  *
  96  * This function cleans up the SKB, i.e. it removes all the stuff
  97  * only useful for monitoring.
  98  */
  99 static void remove_monitor_info(struct sk_buff *skb,
 100                                 unsigned int present_fcs_len,
 101                                 unsigned int rtap_space)
 102 {
 103         if (present_fcs_len)
 104                 __pskb_trim(skb, skb->len - present_fcs_len);
 105         __pskb_pull(skb, rtap_space);
 106 }
 107
 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 109                                      unsigned int rtap_space)
 110 {
 111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 112         struct ieee80211_hdr *hdr;
 113
 114         hdr = (void *)(skb->data + rtap_space);
 115
 116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 117                             RX_FLAG_FAILED_PLCP_CRC |
 118                             RX_FLAG_ONLY_MONITOR |
 119                             RX_FLAG_NO_PSDU))
 120                 return true;
 121
 122         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 123                 return true;
 124
 125         if (ieee80211_is_ctl(hdr->frame_control) &&
 126             !ieee80211_is_pspoll(hdr->frame_control) &&
 127             !ieee80211_is_back_req(hdr->frame_control))
 128                 return true;
 129
 130         return false;
 131 }
 132
 133 static int
 134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 135                              struct ieee80211_rx_status *status,
 136                              struct sk_buff *skb)
 137 {
 138         int len;
 139
 140         /* always present fields */
 141         len = sizeof(struct ieee80211_radiotap_header) + 8;
 142
 143         /* allocate extra bitmaps */
 144         if (status->chains)
 145                 len += 4 * hweight8(status->chains);
 146
 147         if (ieee80211_have_rx_timestamp(status)) {
 148                 len = ALIGN(len, 8);
 149                 len += 8;
 150         }
 151         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 152                 len += 1;
 153
 154         /* antenna field, if we don't have per-chain info */
 155         if (!status->chains)
 156                 len += 1;
 157
 158         /* padding for RX_FLAGS if necessary */
 159         len = ALIGN(len, 2);
 160
 161         if (status->encoding == RX_ENC_HT) /* HT info */
 162                 len += 3;
 163
 164         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 165                 len = ALIGN(len, 4);
 166                 len += 8;
 167         }
 168
 169         if (status->encoding == RX_ENC_VHT) {
 170                 len = ALIGN(len, 2);
 171                 len += 12;
 172         }
 173
 174         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 175                 len = ALIGN(len, 8);
 176                 len += 12;
 177         }
 178
 179         if (status->encoding == RX_ENC_HE &&
 180             status->flag & RX_FLAG_RADIOTAP_HE) {
 181                 len = ALIGN(len, 2);
 182                 len += 12;
 183                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 184         }
 185
 186         if (status->encoding == RX_ENC_HE &&
 187             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 188                 len = ALIGN(len, 2);
 189                 len += 12;
 190                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 191         }
 192
 193         if (status->flag & RX_FLAG_NO_PSDU)
 194                 len += 1;
 195
 196         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 197                 len = ALIGN(len, 2);
 198                 len += 4;
 199                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 200         }
 201
 202         if (status->chains) {
 203                 /* antenna and antenna signal fields */
 204                 len += 2 * hweight8(status->chains);
 205         }
 206
 207         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 208                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 209
 210                 /* vendor presence bitmap */
 211                 len += 4;
 212                 /* alignment for fixed 6-byte vendor data header */
 213                 len = ALIGN(len, 2);
 214                 /* vendor data header */
 215                 len += 6;
 216                 if (WARN_ON(rtap->align == 0))
 217                         rtap->align = 1;
 218                 len = ALIGN(len, rtap->align);
 219                 len += rtap->len + rtap->pad;
 220         }
 221
 222         return len;
 223 }
 224
 225 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 226                                          struct sk_buff *skb,
 227                                          int rtap_space)
 228 {
 229         struct {
 230                 struct ieee80211_hdr_3addr hdr;
 231                 u8 category;
 232                 u8 action_code;
 233         } __packed action;
 234
 235         if (!sdata)
 236                 return;
 237
 238         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 239
 240         if (skb->len < rtap_space + sizeof(action) +
 241                        VHT_MUMIMO_GROUPS_DATA_LEN)
 242                 return;
 243
 244         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 245                 return;
 246
 247         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 248
 249         if (!ieee80211_is_action(action.hdr.frame_control))
 250                 return;
 251
 252         if (action.category != WLAN_CATEGORY_VHT)
 253                 return;
 254
 255         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 256                 return;
 257
 258         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 259                 return;
 260
 261         skb = skb_copy(skb, GFP_ATOMIC);
 262         if (!skb)
 263                 return;
 264
 265         skb_queue_tail(&sdata->skb_queue, skb);
 266         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 267 }
 268
 269 /*
 270  * ieee80211_add_rx_radiotap_header - add radiotap header
 271  *
 272  * add a radiotap header containing all the fields which the hardware provided.
 273  */
 274 static void
 275 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 276                                  struct sk_buff *skb,
 277                                  struct ieee80211_rate *rate,
 278                                  int rtap_len, bool has_fcs)
 279 {
 280         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 281         struct ieee80211_radiotap_header *rthdr;
 282         unsigned char *pos;
 283         __le32 *it_present;
 284         u32 it_present_val;
 285         u16 rx_flags = 0;
 286         u16 channel_flags = 0;
 287         int mpdulen, chain;
 288         unsigned long chains = status->chains;
 289         struct ieee80211_vendor_radiotap rtap = {};
 290         struct ieee80211_radiotap_he he = {};
 291         struct ieee80211_radiotap_he_mu he_mu = {};
 292         struct ieee80211_radiotap_lsig lsig = {};
 293
 294         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 295                 he = *(struct ieee80211_radiotap_he *)skb->data;
 296                 skb_pull(skb, sizeof(he));
 297                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 298         }
 299
 300         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 301                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 302                 skb_pull(skb, sizeof(he_mu));
 303         }
 304
 305         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 306                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 307                 skb_pull(skb, sizeof(lsig));
 308         }
 309
 310         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 311                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 312                 /* rtap.len and rtap.pad are undone immediately */
 313                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 314         }
 315
 316         mpdulen = skb->len;
 317         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 318                 mpdulen += FCS_LEN;
 319
 320         rthdr = skb_push(skb, rtap_len);
 321         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 322         it_present = &rthdr->it_present;
 323
 324         /* radiotap header, set always present flags */
 325         rthdr->it_len = cpu_to_le16(rtap_len);
 326         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 327                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 328                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 329
 330         if (!status->chains)
 331                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 332
 333         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 334                 it_present_val |=
 335                         BIT(IEEE80211_RADIOTAP_EXT) |
 336                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 337                 put_unaligned_le32(it_present_val, it_present);
 338                 it_present++;
 339                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 340                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 341         }
 342
 343         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 344                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 345                                   BIT(IEEE80211_RADIOTAP_EXT);
 346                 put_unaligned_le32(it_present_val, it_present);
 347                 it_present++;
 348                 it_present_val = rtap.present;
 349         }
 350
 351         put_unaligned_le32(it_present_val, it_present);
 352
 353         pos = (void *)(it_present + 1);
 354
 355         /* the order of the following fields is important */
 356
 357         /* IEEE80211_RADIOTAP_TSFT */
 358         if (ieee80211_have_rx_timestamp(status)) {
 359                 /* padding */
 360                 while ((pos - (u8 *)rthdr) & 7)
 361                         *pos++ = 0;
 362                 put_unaligned_le64(
 363                         ieee80211_calculate_rx_timestamp(local, status,
 364                                                          mpdulen, 0),
 365                         pos);
 366                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 367                 pos += 8;
 368         }
 369
 370         /* IEEE80211_RADIOTAP_FLAGS */
 371         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 372                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 373         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 374                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 375         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 376                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 377         pos++;
 378
 379         /* IEEE80211_RADIOTAP_RATE */
 380         if (!rate || status->encoding != RX_ENC_LEGACY) {
 381                 /*
 382                  * Without rate information don't add it. If we have,
 383                  * MCS information is a separate field in radiotap,
 384                  * added below. The byte here is needed as padding
 385                  * for the channel though, so initialise it to 0.
 386                  */
 387                 *pos = 0;
 388         } else {
 389                 int shift = 0;
 390                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 391                 if (status->bw == RATE_INFO_BW_10)
 392                         shift = 1;
 393                 else if (status->bw == RATE_INFO_BW_5)
 394                         shift = 2;
 395                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 396         }
 397         pos++;
 398
 399         /* IEEE80211_RADIOTAP_CHANNEL */
 400         put_unaligned_le16(status->freq, pos);
 401         pos += 2;
 402         if (status->bw == RATE_INFO_BW_10)
 403                 channel_flags |= IEEE80211_CHAN_HALF;
 404         else if (status->bw == RATE_INFO_BW_5)
 405                 channel_flags |= IEEE80211_CHAN_QUARTER;
 406
 407         if (status->band == NL80211_BAND_5GHZ)
 408                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 409         else if (status->encoding != RX_ENC_LEGACY)
 410                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 411         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 412                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 413         else if (rate)
 414                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 415         else
 416                 channel_flags |= IEEE80211_CHAN_2GHZ;
 417         put_unaligned_le16(channel_flags, pos);
 418         pos += 2;
 419
 420         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 421         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 422             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 423                 *pos = status->signal;
 424                 rthdr->it_present |=
 425                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 426                 pos++;
 427         }
 428
 429         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 430
 431         if (!status->chains) {
 432                 /* IEEE80211_RADIOTAP_ANTENNA */
 433                 *pos = status->antenna;
 434                 pos++;
 435         }
 436
 437         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 438
 439         /* IEEE80211_RADIOTAP_RX_FLAGS */
 440         /* ensure 2 byte alignment for the 2 byte field as required */
 441         if ((pos - (u8 *)rthdr) & 1)
 442                 *pos++ = 0;
 443         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 444                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 445         put_unaligned_le16(rx_flags, pos);
 446         pos += 2;
 447
 448         if (status->encoding == RX_ENC_HT) {
 449                 unsigned int stbc;
 450
 451                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 452                 *pos++ = local->hw.radiotap_mcs_details;
 453                 *pos = 0;
 454                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 455                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 456                 if (status->bw == RATE_INFO_BW_40)
 457                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 458                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 459                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 460                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 461                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 462                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 463                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 464                 pos++;
 465                 *pos++ = status->rate_idx;
 466         }
 467
 468         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 469                 u16 flags = 0;
 470
 471                 /* ensure 4 byte alignment */
 472                 while ((pos - (u8 *)rthdr) & 3)
 473                         pos++;
 474                 rthdr->it_present |=
 475                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 476                 put_unaligned_le32(status->ampdu_reference, pos);
 477                 pos += 4;
 478                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 479                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 480                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 481                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 482                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 483                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 484                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 485                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 486                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 487                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 488                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 489                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 490                 put_unaligned_le16(flags, pos);
 491                 pos += 2;
 492                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 493                         *pos++ = status->ampdu_delimiter_crc;
 494                 else
 495                         *pos++ = 0;
 496                 *pos++ = 0;
 497         }
 498
 499         if (status->encoding == RX_ENC_VHT) {
 500                 u16 known = local->hw.radiotap_vht_details;
 501
 502                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 503                 put_unaligned_le16(known, pos);
 504                 pos += 2;
 505                 /* flags */
 506                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 507                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 508                 /* in VHT, STBC is binary */
 509                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 510                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 511                 if (status->enc_flags & RX_ENC_FLAG_BF)
 512                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 513                 pos++;
 514                 /* bandwidth */
 515                 switch (status->bw) {
 516                 case RATE_INFO_BW_80:
 517                         *pos++ = 4;
 518                         break;
 519                 case RATE_INFO_BW_160:
 520                         *pos++ = 11;
 521                         break;
 522                 case RATE_INFO_BW_40:
 523                         *pos++ = 1;
 524                         break;
 525                 default:
 526                         *pos++ = 0;
 527                 }
 528                 /* MCS/NSS */
 529                 *pos = (status->rate_idx << 4) | status->nss;
 530                 pos += 4;
 531                 /* coding field */
 532                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 533                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 534                 pos++;
 535                 /* group ID */
 536                 pos++;
 537                 /* partial_aid */
 538                 pos += 2;
 539         }
 540
 541         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 542                 u16 accuracy = 0;
 543                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 544
 545                 rthdr->it_present |=
 546                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 547
 548                 /* ensure 8 byte alignment */
 549                 while ((pos - (u8 *)rthdr) & 7)
 550                         pos++;
 551
 552                 put_unaligned_le64(status->device_timestamp, pos);
 553                 pos += sizeof(u64);
 554
 555                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 556                         accuracy = local->hw.radiotap_timestamp.accuracy;
 557                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 558                 }
 559                 put_unaligned_le16(accuracy, pos);
 560                 pos += sizeof(u16);
 561
 562                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 563                 *pos++ = flags;
 564         }
 565
 566         if (status->encoding == RX_ENC_HE &&
 567             status->flag & RX_FLAG_RADIOTAP_HE) {
 568 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 569
 570                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 571                         he.data6 |= HE_PREP(DATA6_NSTS,
 572                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 573                                                       status->enc_flags));
 574                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 575                 } else {
 576                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 577                 }
 578
 579 #define CHECK_GI(s) \
 580         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 581                      (int)NL80211_RATE_INFO_HE_GI_##s)
 582
 583                 CHECK_GI(0_8);
 584                 CHECK_GI(1_6);
 585                 CHECK_GI(3_2);
 586
 587                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 588                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 589                 he.data3 |= HE_PREP(DATA3_CODING,
 590                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 591
 592                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 593
 594                 switch (status->bw) {
 595                 case RATE_INFO_BW_20:
 596                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 597                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 598                         break;
 599                 case RATE_INFO_BW_40:
 600                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 601                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 602                         break;
 603                 case RATE_INFO_BW_80:
 604                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 605                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 606                         break;
 607                 case RATE_INFO_BW_160:
 608                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 609                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 610                         break;
 611                 case RATE_INFO_BW_HE_RU:
 612 #define CHECK_RU_ALLOC(s) \
 613         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 614                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 615
 616                         CHECK_RU_ALLOC(26);
 617                         CHECK_RU_ALLOC(52);
 618                         CHECK_RU_ALLOC(106);
 619                         CHECK_RU_ALLOC(242);
 620                         CHECK_RU_ALLOC(484);
 621                         CHECK_RU_ALLOC(996);
 622                         CHECK_RU_ALLOC(2x996);
 623
 624                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 625                                             status->he_ru + 4);
 626                         break;
 627                 default:
 628                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 629                 }
 630
 631                 /* ensure 2 byte alignment */
 632                 while ((pos - (u8 *)rthdr) & 1)
 633                         pos++;
 634                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 635                 memcpy(pos, &he, sizeof(he));
 636                 pos += sizeof(he);
 637         }
 638
 639         if (status->encoding == RX_ENC_HE &&
 640             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 641                 /* ensure 2 byte alignment */
 642                 while ((pos - (u8 *)rthdr) & 1)
 643                         pos++;
 644                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 645                 memcpy(pos, &he_mu, sizeof(he_mu));
 646                 pos += sizeof(he_mu);
 647         }
 648
 649         if (status->flag & RX_FLAG_NO_PSDU) {
 650                 rthdr->it_present |=
 651                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 652                 *pos++ = status->zero_length_psdu_type;
 653         }
 654
 655         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 656                 /* ensure 2 byte alignment */
 657                 while ((pos - (u8 *)rthdr) & 1)
 658                         pos++;
 659                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 660                 memcpy(pos, &lsig, sizeof(lsig));
 661                 pos += sizeof(lsig);
 662         }
 663
 664         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 665                 *pos++ = status->chain_signal[chain];
 666                 *pos++ = chain;
 667         }
 668
 669         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 670                 /* ensure 2 byte alignment for the vendor field as required */
 671                 if ((pos - (u8 *)rthdr) & 1)
 672                         *pos++ = 0;
 673                 *pos++ = rtap.oui[0];
 674                 *pos++ = rtap.oui[1];
 675                 *pos++ = rtap.oui[2];
 676                 *pos++ = rtap.subns;
 677                 put_unaligned_le16(rtap.len, pos);
 678                 pos += 2;
 679                 /* align the actual payload as requested */
 680                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 681                         *pos++ = 0;
 682                 /* data (and possible padding) already follows */
 683         }
 684 }
 685
 686 static struct sk_buff *
 687 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 688                            struct sk_buff **origskb,
 689                            struct ieee80211_rate *rate,
 690                            int rtap_space, bool use_origskb)
 691 {
 692         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 693         int rt_hdrlen, needed_headroom;
 694         struct sk_buff *skb;
 695
 696         /* room for the radiotap header based on driver features */
 697         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 698         needed_headroom = rt_hdrlen - rtap_space;
 699
 700         if (use_origskb) {
 701                 /* only need to expand headroom if necessary */
 702                 skb = *origskb;
 703                 *origskb = NULL;
 704
 705                 /*
 706                  * This shouldn't trigger often because most devices have an
 707                  * RX header they pull before we get here, and that should
 708                  * be big enough for our radiotap information. We should
 709                  * probably export the length to drivers so that we can have
 710                  * them allocate enough headroom to start with.
 711                  */
 712                 if (skb_headroom(skb) < needed_headroom &&
 713                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 714                         dev_kfree_skb(skb);
 715                         return NULL;
 716                 }
 717         } else {
 718                 /*
 719                  * Need to make a copy and possibly remove radiotap header
 720                  * and FCS from the original.
 721                  */
 722                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 723
 724                 if (!skb)
 725                         return NULL;
 726         }
 727
 728         /* prepend radiotap information */
 729         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 730
 731         skb_reset_mac_header(skb);
 732         skb->ip_summed = CHECKSUM_UNNECESSARY;
 733         skb->pkt_type = PACKET_OTHERHOST;
 734         skb->protocol = htons(ETH_P_802_2);
 735
 736         return skb;
 737 }
 738
 739 /*
 740  * This function copies a received frame to all monitor interfaces and
 741  * returns a cleaned-up SKB that no longer includes the FCS nor the
 742  * radiotap header the driver might have added.
 743  */
 744 static struct sk_buff *
 745 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 746                      struct ieee80211_rate *rate)
 747 {
 748         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 749         struct ieee80211_sub_if_data *sdata;
 750         struct sk_buff *monskb = NULL;
 751         int present_fcs_len = 0;
 752         unsigned int rtap_space = 0;
 753         struct ieee80211_sub_if_data *monitor_sdata =
 754                 rcu_dereference(local->monitor_sdata);
 755         bool only_monitor = false;
 756
 757         if (status->flag & RX_FLAG_RADIOTAP_HE)
 758                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 759
 760         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 761                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 762
 763         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 764                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 765
 766                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 767         }
 768
 769         /*
 770          * First, we may need to make a copy of the skb because
 771          *  (1) we need to modify it for radiotap (if not present), and
 772          *  (2) the other RX handlers will modify the skb we got.
 773          *
 774          * We don't need to, of course, if we aren't going to return
 775          * the SKB because it has a bad FCS/PLCP checksum.
 776          */
 777
 778         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 779                 if (unlikely(origskb->len <= FCS_LEN)) {
 780                         /* driver bug */
 781                         WARN_ON(1);
 782                         dev_kfree_skb(origskb);
 783                         return NULL;
 784                 }
 785                 present_fcs_len = FCS_LEN;
 786         }
 787
 788         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 789         if (!pskb_may_pull(origskb, 2 + rtap_space)) {
 790                 dev_kfree_skb(origskb);
 791                 return NULL;
 792         }
 793
 794         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 795
 796         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 797                 if (only_monitor) {
 798                         dev_kfree_skb(origskb);
 799                         return NULL;
 800                 }
 801
 802                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 803                 return origskb;
 804         }
 805
 806         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 807
 808         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 809                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 810                                                  &local->mon_list);
 811
 812                 if (!monskb)
 813                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 814                                                             rate, rtap_space,
 815                                                             only_monitor &&
 816                                                             last_monitor);
 817
 818                 if (monskb) {
 819                         struct sk_buff *skb;
 820
 821                         if (last_monitor) {
 822                                 skb = monskb;
 823                                 monskb = NULL;
 824                         } else {
 825                                 skb = skb_clone(monskb, GFP_ATOMIC);
 826                         }
 827
 828                         if (skb) {
 829                                 skb->dev = sdata->dev;
 830                                 ieee80211_rx_stats(skb->dev, skb->len);
 831                                 netif_receive_skb(skb);
 832                         }
 833                 }
 834
 835                 if (last_monitor)
 836                         break;
 837         }
 838
 839         /* this happens if last_monitor was erroneously false */
 840         dev_kfree_skb(monskb);
 841
 842         /* ditto */
 843         if (!origskb)
 844                 return NULL;
 845
 846         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 847         return origskb;
 848 }
 849
 850 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 851 {
 852         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 853         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 854         int tid, seqno_idx, security_idx;
 855
 856         /* does the frame have a qos control field? */
 857         if (ieee80211_is_data_qos(hdr->frame_control)) {
 858                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 859                 /* frame has qos control */
 860                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 861                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 862                         status->rx_flags |= IEEE80211_RX_AMSDU;
 863
 864                 seqno_idx = tid;
 865                 security_idx = tid;
 866         } else {
 867                 /*
 868                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 869                  *
 870                  *      Sequence numbers for management frames, QoS data
 871                  *      frames with a broadcast/multicast address in the
 872                  *      Address 1 field, and all non-QoS data frames sent
 873                  *      by QoS STAs are assigned using an additional single
 874                  *      modulo-4096 counter, [...]
 875                  *
 876                  * We also use that counter for non-QoS STAs.
 877                  */
 878                 seqno_idx = IEEE80211_NUM_TIDS;
 879                 security_idx = 0;
 880                 if (ieee80211_is_mgmt(hdr->frame_control))
 881                         security_idx = IEEE80211_NUM_TIDS;
 882                 tid = 0;
 883         }
 884
 885         rx->seqno_idx = seqno_idx;
 886         rx->security_idx = security_idx;
 887         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 888          * For now, set skb->priority to 0 for other cases. */
 889         rx->skb->priority = (tid > 7) ? 0 : tid;
 890 }
 891
 892 /**
 893  * DOC: Packet alignment
 894  *
 895  * Drivers always need to pass packets that are aligned to two-byte boundaries
 896  * to the stack.
 897  *
 898  * Additionally, should, if possible, align the payload data in a way that
 899  * guarantees that the contained IP header is aligned to a four-byte
 900  * boundary. In the case of regular frames, this simply means aligning the
 901  * payload to a four-byte boundary (because either the IP header is directly
 902  * contained, or IV/RFC1042 headers that have a length divisible by four are
 903  * in front of it).  If the payload data is not properly aligned and the
 904  * architecture doesn't support efficient unaligned operations, mac80211
 905  * will align the data.
 906  *
 907  * With A-MSDU frames, however, the payload data address must yield two modulo
 908  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 909  * push the IP header further back to a multiple of four again. Thankfully, the
 910  * specs were sane enough this time around to require padding each A-MSDU
 911  * subframe to a length that is a multiple of four.
 912  *
 913  * Padding like Atheros hardware adds which is between the 802.11 header and
 914  * the payload is not supported, the driver is required to move the 802.11
 915  * header to be directly in front of the payload in that case.
 916  */
 917 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 918 {
 919 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 920         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 921 #endif
 922 }
 923
 924
 925 /* rx handlers */
 926
 927 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 928 {
 929         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 930
 931         if (is_multicast_ether_addr(hdr->addr1))
 932                 return 0;
 933
 934         return ieee80211_is_robust_mgmt_frame(skb);
 935 }
 936
 937
 938 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 939 {
 940         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 941
 942         if (!is_multicast_ether_addr(hdr->addr1))
 943                 return 0;
 944
 945         return ieee80211_is_robust_mgmt_frame(skb);
 946 }
 947
 948
 949 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 950 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 951 {
 952         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 953         struct ieee80211_mmie *mmie;
 954         struct ieee80211_mmie_16 *mmie16;
 955
 956         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 957                 return -1;
 958
 959         if (!ieee80211_is_robust_mgmt_frame(skb))
 960                 return -1; /* not a robust management frame */
 961
 962         mmie = (struct ieee80211_mmie *)
 963                 (skb->data + skb->len - sizeof(*mmie));
 964         if (mmie->element_id == WLAN_EID_MMIE &&
 965             mmie->length == sizeof(*mmie) - 2)
 966                 return le16_to_cpu(mmie->key_id);
 967
 968         mmie16 = (struct ieee80211_mmie_16 *)
 969                 (skb->data + skb->len - sizeof(*mmie16));
 970         if (skb->len >= 24 + sizeof(*mmie16) &&
 971             mmie16->element_id == WLAN_EID_MMIE &&
 972             mmie16->length == sizeof(*mmie16) - 2)
 973                 return le16_to_cpu(mmie16->key_id);
 974
 975         return -1;
 976 }
 977
 978 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 979                                   struct sk_buff *skb)
 980 {
 981         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 982         __le16 fc;
 983         int hdrlen;
 984         u8 keyid;
 985
 986         fc = hdr->frame_control;
 987         hdrlen = ieee80211_hdrlen(fc);
 988
 989         if (skb->len < hdrlen + cs->hdr_len)
 990                 return -EINVAL;
 991
 992         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 993         keyid &= cs->key_idx_mask;
 994         keyid >>= cs->key_idx_shift;
 995
 996         return keyid;
 997 }
 998
 999 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1000 {
1001         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1002         char *dev_addr = rx->sdata->vif.addr;
1003
1004         if (ieee80211_is_data(hdr->frame_control)) {
1005                 if (is_multicast_ether_addr(hdr->addr1)) {
1006                         if (ieee80211_has_tods(hdr->frame_control) ||
1007                             !ieee80211_has_fromds(hdr->frame_control))
1008                                 return RX_DROP_MONITOR;
1009                         if (ether_addr_equal(hdr->addr3, dev_addr))
1010                                 return RX_DROP_MONITOR;
1011                 } else {
1012                         if (!ieee80211_has_a4(hdr->frame_control))
1013                                 return RX_DROP_MONITOR;
1014                         if (ether_addr_equal(hdr->addr4, dev_addr))
1015                                 return RX_DROP_MONITOR;
1016                 }
1017         }
1018
1019         /* If there is not an established peer link and this is not a peer link
1020          * establisment frame, beacon or probe, drop the frame.
1021          */
1022
1023         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1024                 struct ieee80211_mgmt *mgmt;
1025
1026                 if (!ieee80211_is_mgmt(hdr->frame_control))
1027                         return RX_DROP_MONITOR;
1028
1029                 if (ieee80211_is_action(hdr->frame_control)) {
1030                         u8 category;
1031
1032                         /* make sure category field is present */
1033                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1034                                 return RX_DROP_MONITOR;
1035
1036                         mgmt = (struct ieee80211_mgmt *)hdr;
1037                         category = mgmt->u.action.category;
1038                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1039                             category != WLAN_CATEGORY_SELF_PROTECTED)
1040                                 return RX_DROP_MONITOR;
1041                         return RX_CONTINUE;
1042                 }
1043
1044                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1045                     ieee80211_is_probe_resp(hdr->frame_control) ||
1046                     ieee80211_is_beacon(hdr->frame_control) ||
1047                     ieee80211_is_auth(hdr->frame_control))
1048                         return RX_CONTINUE;
1049
1050                 return RX_DROP_MONITOR;
1051         }
1052
1053         return RX_CONTINUE;
1054 }
1055
1056 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1057                                               int index)
1058 {
1059         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1060         struct sk_buff *tail = skb_peek_tail(frames);
1061         struct ieee80211_rx_status *status;
1062
1063         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1064                 return true;
1065
1066         if (!tail)
1067                 return false;
1068
1069         status = IEEE80211_SKB_RXCB(tail);
1070         if (status->flag & RX_FLAG_AMSDU_MORE)
1071                 return false;
1072
1073         return true;
1074 }
1075
1076 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1077                                             struct tid_ampdu_rx *tid_agg_rx,
1078                                             int index,
1079                                             struct sk_buff_head *frames)
1080 {
1081         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1082         struct sk_buff *skb;
1083         struct ieee80211_rx_status *status;
1084
1085         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1086
1087         if (skb_queue_empty(skb_list))
1088                 goto no_frame;
1089
1090         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1091                 __skb_queue_purge(skb_list);
1092                 goto no_frame;
1093         }
1094
1095         /* release frames from the reorder ring buffer */
1096         tid_agg_rx->stored_mpdu_num--;
1097         while ((skb = __skb_dequeue(skb_list))) {
1098                 status = IEEE80211_SKB_RXCB(skb);
1099                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1100                 __skb_queue_tail(frames, skb);
1101         }
1102
1103 no_frame:
1104         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1105         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1106 }
1107
1108 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1109                                              struct tid_ampdu_rx *tid_agg_rx,
1110                                              u16 head_seq_num,
1111                                              struct sk_buff_head *frames)
1112 {
1113         int index;
1114
1115         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1116
1117         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1118                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1119                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1120                                                 frames);
1121         }
1122 }
1123
1124 /*
1125  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1126  * the skb was added to the buffer longer than this time ago, the earlier
1127  * frames that have not yet been received are assumed to be lost and the skb
1128  * can be released for processing. This may also release other skb's from the
1129  * reorder buffer if there are no additional gaps between the frames.
1130  *
1131  * Callers must hold tid_agg_rx->reorder_lock.
1132  */
1133 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1134
1135 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1136                                           struct tid_ampdu_rx *tid_agg_rx,
1137                                           struct sk_buff_head *frames)
1138 {
1139         int index, i, j;
1140
1141         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1142
1143         /* release the buffer until next missing frame */
1144         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1145         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1146             tid_agg_rx->stored_mpdu_num) {
1147                 /*
1148                  * No buffers ready to be released, but check whether any
1149                  * frames in the reorder buffer have timed out.
1150                  */
1151                 int skipped = 1;
1152                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1153                      j = (j + 1) % tid_agg_rx->buf_size) {
1154                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1155                                 skipped++;
1156                                 continue;
1157                         }
1158                         if (skipped &&
1159                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1160                                         HT_RX_REORDER_BUF_TIMEOUT))
1161                                 goto set_release_timer;
1162
1163                         /* don't leave incomplete A-MSDUs around */
1164                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1165                              i = (i + 1) % tid_agg_rx->buf_size)
1166                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1167
1168                         ht_dbg_ratelimited(sdata,
1169                                            "release an RX reorder frame due to timeout on earlier frames\n");
1170                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1171                                                         frames);
1172
1173                         /*
1174                          * Increment the head seq# also for the skipped slots.
1175                          */
1176                         tid_agg_rx->head_seq_num =
1177                                 (tid_agg_rx->head_seq_num +
1178                                  skipped) & IEEE80211_SN_MASK;
1179                         skipped = 0;
1180                 }
1181         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1182                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1183                                                 frames);
1184                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1185         }
1186
1187         if (tid_agg_rx->stored_mpdu_num) {
1188                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1189
1190                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1191                      j = (j + 1) % tid_agg_rx->buf_size) {
1192                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1193                                 break;
1194                 }
1195
1196  set_release_timer:
1197
1198                 if (!tid_agg_rx->removed)
1199                         mod_timer(&tid_agg_rx->reorder_timer,
1200                                   tid_agg_rx->reorder_time[j] + 1 +
1201                                   HT_RX_REORDER_BUF_TIMEOUT);
1202         } else {
1203                 del_timer(&tid_agg_rx->reorder_timer);
1204         }
1205 }
1206
1207 /*
1208  * As this function belongs to the RX path it must be under
1209  * rcu_read_lock protection. It returns false if the frame
1210  * can be processed immediately, true if it was consumed.
1211  */
1212 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1213                                              struct tid_ampdu_rx *tid_agg_rx,
1214                                              struct sk_buff *skb,
1215                                              struct sk_buff_head *frames)
1216 {
1217         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1218         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1219         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1220         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1221         u16 head_seq_num, buf_size;
1222         int index;
1223         bool ret = true;
1224
1225         spin_lock(&tid_agg_rx->reorder_lock);
1226
1227         /*
1228          * Offloaded BA sessions have no known starting sequence number so pick
1229          * one from first Rxed frame for this tid after BA was started.
1230          */
1231         if (unlikely(tid_agg_rx->auto_seq)) {
1232                 tid_agg_rx->auto_seq = false;
1233                 tid_agg_rx->ssn = mpdu_seq_num;
1234                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1235         }
1236
1237         buf_size = tid_agg_rx->buf_size;
1238         head_seq_num = tid_agg_rx->head_seq_num;
1239
1240         /*
1241          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1242          * be reordered.
1243          */
1244         if (unlikely(!tid_agg_rx->started)) {
1245                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1246                         ret = false;
1247                         goto out;
1248                 }
1249                 tid_agg_rx->started = true;
1250         }
1251
1252         /* frame with out of date sequence number */
1253         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1254                 dev_kfree_skb(skb);
1255                 goto out;
1256         }
1257
1258         /*
1259          * If frame the sequence number exceeds our buffering window
1260          * size release some previous frames to make room for this one.
1261          */
1262         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1263                 head_seq_num = ieee80211_sn_inc(
1264                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1265                 /* release stored frames up to new head to stack */
1266                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1267                                                  head_seq_num, frames);
1268         }
1269
1270         /* Now the new frame is always in the range of the reordering buffer */
1271
1272         index = mpdu_seq_num % tid_agg_rx->buf_size;
1273
1274         /* check if we already stored this frame */
1275         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1276                 dev_kfree_skb(skb);
1277                 goto out;
1278         }
1279
1280         /*
1281          * If the current MPDU is in the right order and nothing else
1282          * is stored we can process it directly, no need to buffer it.
1283          * If it is first but there's something stored, we may be able
1284          * to release frames after this one.
1285          */
1286         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1287             tid_agg_rx->stored_mpdu_num == 0) {
1288                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1289                         tid_agg_rx->head_seq_num =
1290                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1291                 ret = false;
1292                 goto out;
1293         }
1294
1295         /* put the frame in the reordering buffer */
1296         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1297         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1298                 tid_agg_rx->reorder_time[index] = jiffies;
1299                 tid_agg_rx->stored_mpdu_num++;
1300                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1301         }
1302
1303  out:
1304         spin_unlock(&tid_agg_rx->reorder_lock);
1305         return ret;
1306 }
1307
1308 /*
1309  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1310  * true if the MPDU was buffered, false if it should be processed.
1311  */
1312 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1313                                        struct sk_buff_head *frames)
1314 {
1315         struct sk_buff *skb = rx->skb;
1316         struct ieee80211_local *local = rx->local;
1317         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1318         struct sta_info *sta = rx->sta;
1319         struct tid_ampdu_rx *tid_agg_rx;
1320         u16 sc;
1321         u8 tid, ack_policy;
1322
1323         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1324             is_multicast_ether_addr(hdr->addr1))
1325                 goto dont_reorder;
1326
1327         /*
1328          * filter the QoS data rx stream according to
1329          * STA/TID and check if this STA/TID is on aggregation
1330          */
1331
1332         if (!sta)
1333                 goto dont_reorder;
1334
1335         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1336                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1337         tid = ieee80211_get_tid(hdr);
1338
1339         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1340         if (!tid_agg_rx) {
1341                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1342                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1343                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1344                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1345                                              WLAN_BACK_RECIPIENT,
1346                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1347                 goto dont_reorder;
1348         }
1349
1350         /* qos null data frames are excluded */
1351         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1352                 goto dont_reorder;
1353
1354         /* not part of a BA session */
1355         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1356             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1357                 goto dont_reorder;
1358
1359         /* new, potentially un-ordered, ampdu frame - process it */
1360
1361         /* reset session timer */
1362         if (tid_agg_rx->timeout)
1363                 tid_agg_rx->last_rx = jiffies;
1364
1365         /* if this mpdu is fragmented - terminate rx aggregation session */
1366         sc = le16_to_cpu(hdr->seq_ctrl);
1367         if (sc & IEEE80211_SCTL_FRAG) {
1368                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1369                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1370                 return;
1371         }
1372
1373         /*
1374          * No locking needed -- we will only ever process one
1375          * RX packet at a time, and thus own tid_agg_rx. All
1376          * other code manipulating it needs to (and does) make
1377          * sure that we cannot get to it any more before doing
1378          * anything with it.
1379          */
1380         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1381                                              frames))
1382                 return;
1383
1384  dont_reorder:
1385         __skb_queue_tail(frames, skb);
1386 }
1387
1388 static ieee80211_rx_result debug_noinline
1389 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1390 {
1391         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1392         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1393
1394         if (status->flag & RX_FLAG_DUP_VALIDATED)
1395                 return RX_CONTINUE;
1396
1397         /*
1398          * Drop duplicate 802.11 retransmissions
1399          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1400          */
1401
1402         if (rx->skb->len < 24)
1403                 return RX_CONTINUE;
1404
1405         if (ieee80211_is_ctl(hdr->frame_control) ||
1406             ieee80211_is_nullfunc(hdr->frame_control) ||
1407             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1408             is_multicast_ether_addr(hdr->addr1))
1409                 return RX_CONTINUE;
1410
1411         if (!rx->sta)
1412                 return RX_CONTINUE;
1413
1414         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1415                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1416                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1417                 rx->sta->rx_stats.num_duplicates++;
1418                 return RX_DROP_UNUSABLE;
1419         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1420                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1421         }
1422
1423         return RX_CONTINUE;
1424 }
1425
1426 static ieee80211_rx_result debug_noinline
1427 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1428 {
1429         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1430
1431         /* Drop disallowed frame classes based on STA auth/assoc state;
1432          * IEEE 802.11, Chap 5.5.
1433          *
1434          * mac80211 filters only based on association state, i.e. it drops
1435          * Class 3 frames from not associated stations. hostapd sends
1436          * deauth/disassoc frames when needed. In addition, hostapd is
1437          * responsible for filtering on both auth and assoc states.
1438          */
1439
1440         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1441                 return ieee80211_rx_mesh_check(rx);
1442
1443         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1444                       ieee80211_is_pspoll(hdr->frame_control)) &&
1445                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1446                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1447                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1448                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1449                 /*
1450                  * accept port control frames from the AP even when it's not
1451                  * yet marked ASSOC to prevent a race where we don't set the
1452                  * assoc bit quickly enough before it sends the first frame
1453                  */
1454                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1455                     ieee80211_is_data_present(hdr->frame_control)) {
1456                         unsigned int hdrlen;
1457                         __be16 ethertype;
1458
1459                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1460
1461                         if (rx->skb->len < hdrlen + 8)
1462                                 return RX_DROP_MONITOR;
1463
1464                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1465                         if (ethertype == rx->sdata->control_port_protocol)
1466                                 return RX_CONTINUE;
1467                 }
1468
1469                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1470                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1471                                                hdr->addr2,
1472                                                GFP_ATOMIC))
1473                         return RX_DROP_UNUSABLE;
1474
1475                 return RX_DROP_MONITOR;
1476         }
1477
1478         return RX_CONTINUE;
1479 }
1480
1481
1482 static ieee80211_rx_result debug_noinline
1483 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1484 {
1485         struct ieee80211_local *local;
1486         struct ieee80211_hdr *hdr;
1487         struct sk_buff *skb;
1488
1489         local = rx->local;
1490         skb = rx->skb;
1491         hdr = (struct ieee80211_hdr *) skb->data;
1492
1493         if (!local->pspolling)
1494                 return RX_CONTINUE;
1495
1496         if (!ieee80211_has_fromds(hdr->frame_control))
1497                 /* this is not from AP */
1498                 return RX_CONTINUE;
1499
1500         if (!ieee80211_is_data(hdr->frame_control))
1501                 return RX_CONTINUE;
1502
1503         if (!ieee80211_has_moredata(hdr->frame_control)) {
1504                 /* AP has no more frames buffered for us */
1505                 local->pspolling = false;
1506                 return RX_CONTINUE;
1507         }
1508
1509         /* more data bit is set, let's request a new frame from the AP */
1510         ieee80211_send_pspoll(local, rx->sdata);
1511
1512         return RX_CONTINUE;
1513 }
1514
1515 static void sta_ps_start(struct sta_info *sta)
1516 {
1517         struct ieee80211_sub_if_data *sdata = sta->sdata;
1518         struct ieee80211_local *local = sdata->local;
1519         struct ps_data *ps;
1520         int tid;
1521
1522         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1523             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1524                 ps = &sdata->bss->ps;
1525         else
1526                 return;
1527
1528         atomic_inc(&ps->num_sta_ps);
1529         set_sta_flag(sta, WLAN_STA_PS_STA);
1530         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1531                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1532         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1533                sta->sta.addr, sta->sta.aid);
1534
1535         ieee80211_clear_fast_xmit(sta);
1536
1537         if (!sta->sta.txq[0])
1538                 return;
1539
1540         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1541                 if (txq_has_queue(sta->sta.txq[tid]))
1542                         set_bit(tid, &sta->txq_buffered_tids);
1543                 else
1544                         clear_bit(tid, &sta->txq_buffered_tids);
1545         }
1546 }
1547
1548 static void sta_ps_end(struct sta_info *sta)
1549 {
1550         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1551                sta->sta.addr, sta->sta.aid);
1552
1553         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1554                 /*
1555                  * Clear the flag only if the other one is still set
1556                  * so that the TX path won't start TX'ing new frames
1557                  * directly ... In the case that the driver flag isn't
1558                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1559                  */
1560                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1561                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1562                        sta->sta.addr, sta->sta.aid);
1563                 return;
1564         }
1565
1566         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1567         clear_sta_flag(sta, WLAN_STA_PS_STA);
1568         ieee80211_sta_ps_deliver_wakeup(sta);
1569 }
1570
1571 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1572 {
1573         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1574         bool in_ps;
1575
1576         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1577
1578         /* Don't let the same PS state be set twice */
1579         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1580         if ((start && in_ps) || (!start && !in_ps))
1581                 return -EINVAL;
1582
1583         if (start)
1584                 sta_ps_start(sta);
1585         else
1586                 sta_ps_end(sta);
1587
1588         return 0;
1589 }
1590 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1591
1592 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1593 {
1594         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1595
1596         if (test_sta_flag(sta, WLAN_STA_SP))
1597                 return;
1598
1599         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1600                 ieee80211_sta_ps_deliver_poll_response(sta);
1601         else
1602                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1603 }
1604 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1605
1606 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1607 {
1608         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1609         int ac = ieee80211_ac_from_tid(tid);
1610
1611         /*
1612          * If this AC is not trigger-enabled do nothing unless the
1613          * driver is calling us after it already checked.
1614          *
1615          * NB: This could/should check a separate bitmap of trigger-
1616          * enabled queues, but for now we only implement uAPSD w/o
1617          * TSPEC changes to the ACs, so they're always the same.
1618          */
1619         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1620             tid != IEEE80211_NUM_TIDS)
1621                 return;
1622
1623         /* if we are in a service period, do nothing */
1624         if (test_sta_flag(sta, WLAN_STA_SP))
1625                 return;
1626
1627         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1628                 ieee80211_sta_ps_deliver_uapsd(sta);
1629         else
1630                 set_sta_flag(sta, WLAN_STA_UAPSD);
1631 }
1632 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1633
1634 static ieee80211_rx_result debug_noinline
1635 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1636 {
1637         struct ieee80211_sub_if_data *sdata = rx->sdata;
1638         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1639         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1640
1641         if (!rx->sta)
1642                 return RX_CONTINUE;
1643
1644         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1645             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1646                 return RX_CONTINUE;
1647
1648         /*
1649          * The device handles station powersave, so don't do anything about
1650          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1651          * it to mac80211 since they're handled.)
1652          */
1653         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1654                 return RX_CONTINUE;
1655
1656         /*
1657          * Don't do anything if the station isn't already asleep. In
1658          * the uAPSD case, the station will probably be marked asleep,
1659          * in the PS-Poll case the station must be confused ...
1660          */
1661         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1662                 return RX_CONTINUE;
1663
1664         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1665                 ieee80211_sta_pspoll(&rx->sta->sta);
1666
1667                 /* Free PS Poll skb here instead of returning RX_DROP that would
1668                  * count as an dropped frame. */
1669                 dev_kfree_skb(rx->skb);
1670
1671                 return RX_QUEUED;
1672         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1673                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1674                    ieee80211_has_pm(hdr->frame_control) &&
1675                    (ieee80211_is_data_qos(hdr->frame_control) ||
1676                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1677                 u8 tid = ieee80211_get_tid(hdr);
1678
1679                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1680         }
1681
1682         return RX_CONTINUE;
1683 }
1684
1685 static ieee80211_rx_result debug_noinline
1686 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1687 {
1688         struct sta_info *sta = rx->sta;
1689         struct sk_buff *skb = rx->skb;
1690         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1691         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1692         int i;
1693
1694         if (!sta)
1695                 return RX_CONTINUE;
1696
1697         /*
1698          * Update last_rx only for IBSS packets which are for the current
1699          * BSSID and for station already AUTHORIZED to avoid keeping the
1700          * current IBSS network alive in cases where other STAs start
1701          * using different BSSID. This will also give the station another
1702          * chance to restart the authentication/authorization in case
1703          * something went wrong the first time.
1704          */
1705         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1706                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1707                                                 NL80211_IFTYPE_ADHOC);
1708                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1709                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1710                         sta->rx_stats.last_rx = jiffies;
1711                         if (ieee80211_is_data(hdr->frame_control) &&
1712                             !is_multicast_ether_addr(hdr->addr1))
1713                                 sta->rx_stats.last_rate =
1714                                         sta_stats_encode_rate(status);
1715                 }
1716         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1717                 sta->rx_stats.last_rx = jiffies;
1718         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1719                 /*
1720                  * Mesh beacons will update last_rx when if they are found to
1721                  * match the current local configuration when processed.
1722                  */
1723                 sta->rx_stats.last_rx = jiffies;
1724                 if (ieee80211_is_data(hdr->frame_control))
1725                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1726         }
1727
1728         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1729                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1730
1731         sta->rx_stats.fragments++;
1732
1733         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1734         sta->rx_stats.bytes += rx->skb->len;
1735         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1736
1737         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1738                 sta->rx_stats.last_signal = status->signal;
1739                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1740         }
1741
1742         if (status->chains) {
1743                 sta->rx_stats.chains = status->chains;
1744                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1745                         int signal = status->chain_signal[i];
1746
1747                         if (!(status->chains & BIT(i)))
1748                                 continue;
1749
1750                         sta->rx_stats.chain_signal_last[i] = signal;
1751                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1752                                         -signal);
1753                 }
1754         }
1755
1756         /*
1757          * Change STA power saving mode only at the end of a frame
1758          * exchange sequence, and only for a data or management
1759          * frame as specified in IEEE 802.11-2016 11.2.3.2
1760          */
1761         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1762             !ieee80211_has_morefrags(hdr->frame_control) &&
1763             !is_multicast_ether_addr(hdr->addr1) &&
1764             (ieee80211_is_mgmt(hdr->frame_control) ||
1765              ieee80211_is_data(hdr->frame_control)) &&
1766             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1767             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1768              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1769                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1770                         if (!ieee80211_has_pm(hdr->frame_control))
1771                                 sta_ps_end(sta);
1772                 } else {
1773                         if (ieee80211_has_pm(hdr->frame_control))
1774                                 sta_ps_start(sta);
1775                 }
1776         }
1777
1778         /* mesh power save support */
1779         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1780                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1781
1782         /*
1783          * Drop (qos-)data::nullfunc frames silently, since they
1784          * are used only to control station power saving mode.
1785          */
1786         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1787             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1788                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1789
1790                 /*
1791                  * If we receive a 4-addr nullfunc frame from a STA
1792                  * that was not moved to a 4-addr STA vlan yet send
1793                  * the event to userspace and for older hostapd drop
1794                  * the frame to the monitor interface.
1795                  */
1796                 if (ieee80211_has_a4(hdr->frame_control) &&
1797                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1798                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1799                       !rx->sdata->u.vlan.sta))) {
1800                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1801                                 cfg80211_rx_unexpected_4addr_frame(
1802                                         rx->sdata->dev, sta->sta.addr,
1803                                         GFP_ATOMIC);
1804                         return RX_DROP_MONITOR;
1805                 }
1806                 /*
1807                  * Update counter and free packet here to avoid
1808                  * counting this as a dropped packed.
1809                  */
1810                 sta->rx_stats.packets++;
1811                 dev_kfree_skb(rx->skb);
1812                 return RX_QUEUED;
1813         }
1814
1815         return RX_CONTINUE;
1816 } /* ieee80211_rx_h_sta_process */
1817
1818 static ieee80211_rx_result debug_noinline
1819 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1820 {
1821         struct sk_buff *skb = rx->skb;
1822         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1823         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1824         int keyidx;
1825         int hdrlen;
1826         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1827         struct ieee80211_key *sta_ptk = NULL;
1828         int mmie_keyidx = -1;
1829         __le16 fc;
1830         const struct ieee80211_cipher_scheme *cs = NULL;
1831
1832         /*
1833          * Key selection 101
1834          *
1835          * There are four types of keys:
1836          *  - GTK (group keys)
1837          *  - IGTK (group keys for management frames)
1838          *  - PTK (pairwise keys)
1839          *  - STK (station-to-station pairwise keys)
1840          *
1841          * When selecting a key, we have to distinguish between multicast
1842          * (including broadcast) and unicast frames, the latter can only
1843          * use PTKs and STKs while the former always use GTKs and IGTKs.
1844          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1845          * unicast frames can also use key indices like GTKs. Hence, if we
1846          * don't have a PTK/STK we check the key index for a WEP key.
1847          *
1848          * Note that in a regular BSS, multicast frames are sent by the
1849          * AP only, associated stations unicast the frame to the AP first
1850          * which then multicasts it on their behalf.
1851          *
1852          * There is also a slight problem in IBSS mode: GTKs are negotiated
1853          * with each station, that is something we don't currently handle.
1854          * The spec seems to expect that one negotiates the same key with
1855          * every station but there's no such requirement; VLANs could be
1856          * possible.
1857          */
1858
1859         /* start without a key */
1860         rx->key = NULL;
1861         fc = hdr->frame_control;
1862
1863         if (rx->sta) {
1864                 int keyid = rx->sta->ptk_idx;
1865
1866                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1867                         cs = rx->sta->cipher_scheme;
1868                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1869                         if (unlikely(keyid < 0))
1870                                 return RX_DROP_UNUSABLE;
1871                 }
1872                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1873         }
1874
1875         if (!ieee80211_has_protected(fc))
1876                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1877
1878         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1879                 rx->key = sta_ptk;
1880                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1881                     (status->flag & RX_FLAG_IV_STRIPPED))
1882                         return RX_CONTINUE;
1883                 /* Skip decryption if the frame is not protected. */
1884                 if (!ieee80211_has_protected(fc))
1885                         return RX_CONTINUE;
1886         } else if (mmie_keyidx >= 0) {
1887                 /* Broadcast/multicast robust management frame / BIP */
1888                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1889                     (status->flag & RX_FLAG_IV_STRIPPED))
1890                         return RX_CONTINUE;
1891
1892                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1893                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1894                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1895                 if (rx->sta) {
1896                         if (ieee80211_is_group_privacy_action(skb) &&
1897                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1898                                 return RX_DROP_MONITOR;
1899
1900                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1901                 }
1902                 if (!rx->key)
1903                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1904         } else if (!ieee80211_has_protected(fc)) {
1905                 /*
1906                  * The frame was not protected, so skip decryption. However, we
1907                  * need to set rx->key if there is a key that could have been
1908                  * used so that the frame may be dropped if encryption would
1909                  * have been expected.
1910                  */
1911                 struct ieee80211_key *key = NULL;
1912                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1913                 int i;
1914
1915                 if (ieee80211_is_mgmt(fc) &&
1916                     is_multicast_ether_addr(hdr->addr1) &&
1917                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1918                         rx->key = key;
1919                 else {
1920                         if (rx->sta) {
1921                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1922                                         key = rcu_dereference(rx->sta->gtk[i]);
1923                                         if (key)
1924                                                 break;
1925                                 }
1926                         }
1927                         if (!key) {
1928                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1929                                         key = rcu_dereference(sdata->keys[i]);
1930                                         if (key)
1931                                                 break;
1932                                 }
1933                         }
1934                         if (key)
1935                                 rx->key = key;
1936                 }
1937                 return RX_CONTINUE;
1938         } else {
1939                 u8 keyid;
1940
1941                 /*
1942                  * The device doesn't give us the IV so we won't be
1943                  * able to look up the key. That's ok though, we
1944                  * don't need to decrypt the frame, we just won't
1945                  * be able to keep statistics accurate.
1946                  * Except for key threshold notifications, should
1947                  * we somehow allow the driver to tell us which key
1948                  * the hardware used if this flag is set?
1949                  */
1950                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1951                     (status->flag & RX_FLAG_IV_STRIPPED))
1952                         return RX_CONTINUE;
1953
1954                 hdrlen = ieee80211_hdrlen(fc);
1955
1956                 if (cs) {
1957                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1958
1959                         if (unlikely(keyidx < 0))
1960                                 return RX_DROP_UNUSABLE;
1961                 } else {
1962                         if (rx->skb->len < 8 + hdrlen)
1963                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1964                         /*
1965                          * no need to call ieee80211_wep_get_keyidx,
1966                          * it verifies a bunch of things we've done already
1967                          */
1968                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1969                         keyidx = keyid >> 6;
1970                 }
1971
1972                 /* check per-station GTK first, if multicast packet */
1973                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1974                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1975
1976                 /* if not found, try default key */
1977                 if (!rx->key) {
1978                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1979
1980                         /*
1981                          * RSNA-protected unicast frames should always be
1982                          * sent with pairwise or station-to-station keys,
1983                          * but for WEP we allow using a key index as well.
1984                          */
1985                         if (rx->key &&
1986                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1987                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1988                             !is_multicast_ether_addr(hdr->addr1))
1989                                 rx->key = NULL;
1990                 }
1991         }
1992
1993         if (rx->key) {
1994                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1995                         return RX_DROP_MONITOR;
1996
1997                 /* TODO: add threshold stuff again */
1998         } else {
1999                 return RX_DROP_MONITOR;
2000         }
2001
2002         switch (rx->key->conf.cipher) {
2003         case WLAN_CIPHER_SUITE_WEP40:
2004         case WLAN_CIPHER_SUITE_WEP104:
2005                 result = ieee80211_crypto_wep_decrypt(rx);
2006                 break;
2007         case WLAN_CIPHER_SUITE_TKIP:
2008                 result = ieee80211_crypto_tkip_decrypt(rx);
2009                 break;
2010         case WLAN_CIPHER_SUITE_CCMP:
2011                 result = ieee80211_crypto_ccmp_decrypt(
2012                         rx, IEEE80211_CCMP_MIC_LEN);
2013                 break;
2014         case WLAN_CIPHER_SUITE_CCMP_256:
2015                 result = ieee80211_crypto_ccmp_decrypt(
2016                         rx, IEEE80211_CCMP_256_MIC_LEN);
2017                 break;
2018         case WLAN_CIPHER_SUITE_AES_CMAC:
2019                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2020                 break;
2021         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2022                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2023                 break;
2024         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2025         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2026                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2027                 break;
2028         case WLAN_CIPHER_SUITE_GCMP:
2029         case WLAN_CIPHER_SUITE_GCMP_256:
2030                 result = ieee80211_crypto_gcmp_decrypt(rx);
2031                 break;
2032         default:
2033                 result = ieee80211_crypto_hw_decrypt(rx);
2034         }
2035
2036         /* the hdr variable is invalid after the decrypt handlers */
2037
2038         /* either the frame has been decrypted or will be dropped */
2039         status->flag |= RX_FLAG_DECRYPTED;
2040
2041         return result;
2042 }
2043
2044 static inline struct ieee80211_fragment_entry *
2045 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2046                          unsigned int frag, unsigned int seq, int rx_queue,
2047                          struct sk_buff **skb)
2048 {
2049         struct ieee80211_fragment_entry *entry;
2050
2051         entry = &sdata->fragments[sdata->fragment_next++];
2052         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2053                 sdata->fragment_next = 0;
2054
2055         if (!skb_queue_empty(&entry->skb_list))
2056                 __skb_queue_purge(&entry->skb_list);
2057
2058         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2059         *skb = NULL;
2060         entry->first_frag_time = jiffies;
2061         entry->seq = seq;
2062         entry->rx_queue = rx_queue;
2063         entry->last_frag = frag;
2064         entry->check_sequential_pn = false;
2065         entry->extra_len = 0;
2066
2067         return entry;
2068 }
2069
2070 static inline struct ieee80211_fragment_entry *
2071 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2072                           unsigned int frag, unsigned int seq,
2073                           int rx_queue, struct ieee80211_hdr *hdr)
2074 {
2075         struct ieee80211_fragment_entry *entry;
2076         int i, idx;
2077
2078         idx = sdata->fragment_next;
2079         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2080                 struct ieee80211_hdr *f_hdr;
2081                 struct sk_buff *f_skb;
2082
2083                 idx--;
2084                 if (idx < 0)
2085                         idx = IEEE80211_FRAGMENT_MAX - 1;
2086
2087                 entry = &sdata->fragments[idx];
2088                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2089                     entry->rx_queue != rx_queue ||
2090                     entry->last_frag + 1 != frag)
2091                         continue;
2092
2093                 f_skb = __skb_peek(&entry->skb_list);
2094                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2095
2096                 /*
2097                  * Check ftype and addresses are equal, else check next fragment
2098                  */
2099                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2100                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2101                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2102                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2103                         continue;
2104
2105                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2106                         __skb_queue_purge(&entry->skb_list);
2107                         continue;
2108                 }
2109                 return entry;
2110         }
2111
2112         return NULL;
2113 }
2114
2115 static ieee80211_rx_result debug_noinline
2116 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2117 {
2118         struct ieee80211_hdr *hdr;
2119         u16 sc;
2120         __le16 fc;
2121         unsigned int frag, seq;
2122         struct ieee80211_fragment_entry *entry;
2123         struct sk_buff *skb;
2124
2125         hdr = (struct ieee80211_hdr *)rx->skb->data;
2126         fc = hdr->frame_control;
2127
2128         if (ieee80211_is_ctl(fc))
2129                 return RX_CONTINUE;
2130
2131         sc = le16_to_cpu(hdr->seq_ctrl);
2132         frag = sc & IEEE80211_SCTL_FRAG;
2133
2134         if (is_multicast_ether_addr(hdr->addr1)) {
2135                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2136                 goto out_no_led;
2137         }
2138
2139         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2140                 goto out;
2141
2142         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2143
2144         if (skb_linearize(rx->skb))
2145                 return RX_DROP_UNUSABLE;
2146
2147         /*
2148          *  skb_linearize() might change the skb->data and
2149          *  previously cached variables (in this case, hdr) need to
2150          *  be refreshed with the new data.
2151          */
2152         hdr = (struct ieee80211_hdr *)rx->skb->data;
2153         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2154
2155         if (frag == 0) {
2156                 /* This is the first fragment of a new frame. */
2157                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2158                                                  rx->seqno_idx, &(rx->skb));
2159                 if (rx->key &&
2160                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2161                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2162                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2163                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2164                     ieee80211_has_protected(fc)) {
2165                         int queue = rx->security_idx;
2166
2167                         /* Store CCMP/GCMP PN so that we can verify that the
2168                          * next fragment has a sequential PN value.
2169                          */
2170                         entry->check_sequential_pn = true;
2171                         memcpy(entry->last_pn,
2172                                rx->key->u.ccmp.rx_pn[queue],
2173                                IEEE80211_CCMP_PN_LEN);
2174                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2175                                               u.ccmp.rx_pn) !=
2176                                      offsetof(struct ieee80211_key,
2177                                               u.gcmp.rx_pn));
2178                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2179                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2180                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2181                                      IEEE80211_GCMP_PN_LEN);
2182                 }
2183                 return RX_QUEUED;
2184         }
2185
2186         /* This is a fragment for a frame that should already be pending in
2187          * fragment cache. Add this fragment to the end of the pending entry.
2188          */
2189         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2190                                           rx->seqno_idx, hdr);
2191         if (!entry) {
2192                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2193                 return RX_DROP_MONITOR;
2194         }
2195
2196         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2197          *  MPDU PN values are not incrementing in steps of 1."
2198          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2199          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2200          */
2201         if (entry->check_sequential_pn) {
2202                 int i;
2203                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2204                 int queue;
2205
2206                 if (!rx->key ||
2207                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2208                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2209                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2210                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2211                         return RX_DROP_UNUSABLE;
2212                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2213                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2214                         pn[i]++;
2215                         if (pn[i])
2216                                 break;
2217                 }
2218                 queue = rx->security_idx;
2219                 rpn = rx->key->u.ccmp.rx_pn[queue];
2220                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2221                         return RX_DROP_UNUSABLE;
2222                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2223         }
2224
2225         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2226         __skb_queue_tail(&entry->skb_list, rx->skb);
2227         entry->last_frag = frag;
2228         entry->extra_len += rx->skb->len;
2229         if (ieee80211_has_morefrags(fc)) {
2230                 rx->skb = NULL;
2231                 return RX_QUEUED;
2232         }
2233
2234         rx->skb = __skb_dequeue(&entry->skb_list);
2235         if (skb_tailroom(rx->skb) < entry->extra_len) {
2236                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2237                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2238                                               GFP_ATOMIC))) {
2239                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2240                         __skb_queue_purge(&entry->skb_list);
2241                         return RX_DROP_UNUSABLE;
2242                 }
2243         }
2244         while ((skb = __skb_dequeue(&entry->skb_list))) {
2245                 skb_put_data(rx->skb, skb->data, skb->len);
2246                 dev_kfree_skb(skb);
2247         }
2248
2249  out:
2250         ieee80211_led_rx(rx->local);
2251  out_no_led:
2252         if (rx->sta)
2253                 rx->sta->rx_stats.packets++;
2254         return RX_CONTINUE;
2255 }
2256
2257 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2258 {
2259         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2260                 return -EACCES;
2261
2262         return 0;
2263 }
2264
2265 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2266 {
2267         struct sk_buff *skb = rx->skb;
2268         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2269
2270         /*
2271          * Pass through unencrypted frames if the hardware has
2272          * decrypted them already.
2273          */
2274         if (status->flag & RX_FLAG_DECRYPTED)
2275                 return 0;
2276
2277         /* Drop unencrypted frames if key is set. */
2278         if (unlikely(!ieee80211_has_protected(fc) &&
2279                      !ieee80211_is_nullfunc(fc) &&
2280                      ieee80211_is_data(fc) && rx->key))
2281                 return -EACCES;
2282
2283         return 0;
2284 }
2285
2286 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2287 {
2288         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2289         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2290         __le16 fc = hdr->frame_control;
2291
2292         /*
2293          * Pass through unencrypted frames if the hardware has
2294          * decrypted them already.
2295          */
2296         if (status->flag & RX_FLAG_DECRYPTED)
2297                 return 0;
2298
2299         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2300                 if (unlikely(!ieee80211_has_protected(fc) &&
2301                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2302                              rx->key)) {
2303                         if (ieee80211_is_deauth(fc) ||
2304                             ieee80211_is_disassoc(fc))
2305                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2306                                                              rx->skb->data,
2307                                                              rx->skb->len);
2308                         return -EACCES;
2309                 }
2310                 /* BIP does not use Protected field, so need to check MMIE */
2311                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2312                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2313                         if (ieee80211_is_deauth(fc) ||
2314                             ieee80211_is_disassoc(fc))
2315                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2316                                                              rx->skb->data,
2317                                                              rx->skb->len);
2318                         return -EACCES;
2319                 }
2320                 /*
2321                  * When using MFP, Action frames are not allowed prior to
2322                  * having configured keys.
2323                  */
2324                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2325                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2326                         return -EACCES;
2327         }
2328
2329         return 0;
2330 }
2331
2332 static int
2333 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2334 {
2335         struct ieee80211_sub_if_data *sdata = rx->sdata;
2336         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2337         bool check_port_control = false;
2338         struct ethhdr *ehdr;
2339         int ret;
2340
2341         *port_control = false;
2342         if (ieee80211_has_a4(hdr->frame_control) &&
2343             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2344                 return -1;
2345
2346         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2347             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2348
2349                 if (!sdata->u.mgd.use_4addr)
2350                         return -1;
2351                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2352                         check_port_control = true;
2353         }
2354
2355         if (is_multicast_ether_addr(hdr->addr1) &&
2356             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2357                 return -1;
2358
2359         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2360         if (ret < 0)
2361                 return ret;
2362
2363         ehdr = (struct ethhdr *) rx->skb->data;
2364         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2365                 *port_control = true;
2366         else if (check_port_control)
2367                 return -1;
2368
2369         return 0;
2370 }
2371
2372 /*
2373  * requires that rx->skb is a frame with ethernet header
2374  */
2375 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2376 {
2377         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2378                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2379         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2380
2381         /*
2382          * Allow EAPOL frames to us/the PAE group address regardless
2383          * of whether the frame was encrypted or not.
2384          */
2385         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2386             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2387              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2388                 return true;
2389
2390         if (ieee80211_802_1x_port_control(rx) ||
2391             ieee80211_drop_unencrypted(rx, fc))
2392                 return false;
2393
2394         return true;
2395 }
2396
2397 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2398                                                  struct ieee80211_rx_data *rx)
2399 {
2400         struct ieee80211_sub_if_data *sdata = rx->sdata;
2401         struct net_device *dev = sdata->dev;
2402
2403         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2404                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2405                      sdata->control_port_over_nl80211)) {
2406                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2407                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2408
2409                 cfg80211_rx_control_port(dev, skb, noencrypt);
2410                 dev_kfree_skb(skb);
2411         } else {
2412                 /* deliver to local stack */
2413                 if (rx->napi)
2414                         napi_gro_receive(rx->napi, skb);
2415                 else
2416                         netif_receive_skb(skb);
2417         }
2418 }
2419
2420 /*
2421  * requires that rx->skb is a frame with ethernet header
2422  */
2423 static void
2424 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2425 {
2426         struct ieee80211_sub_if_data *sdata = rx->sdata;
2427         struct net_device *dev = sdata->dev;
2428         struct sk_buff *skb, *xmit_skb;
2429         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2430         struct sta_info *dsta;
2431
2432         skb = rx->skb;
2433         xmit_skb = NULL;
2434
2435         ieee80211_rx_stats(dev, skb->len);
2436
2437         if (rx->sta) {
2438                 /* The seqno index has the same property as needed
2439                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2440                  * for non-QoS-data frames. Here we know it's a data
2441                  * frame, so count MSDUs.
2442                  */
2443                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2444                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2445                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2446         }
2447
2448         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2449              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2450             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2451             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2452                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2453                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2454                         /*
2455                          * send multicast frames both to higher layers in
2456                          * local net stack and back to the wireless medium
2457                          */
2458                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2459                         if (!xmit_skb)
2460                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2461                                                     dev->name);
2462                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2463                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2464                         dsta = sta_info_get(sdata, ehdr->h_dest);
2465                         if (dsta) {
2466                                 /*
2467                                  * The destination station is associated to
2468                                  * this AP (in this VLAN), so send the frame
2469                                  * directly to it and do not pass it to local
2470                                  * net stack.
2471                                  */
2472                                 xmit_skb = skb;
2473                                 skb = NULL;
2474                         }
2475                 }
2476         }
2477
2478 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2479         if (skb) {
2480                 /* 'align' will only take the values 0 or 2 here since all
2481                  * frames are required to be aligned to 2-byte boundaries
2482                  * when being passed to mac80211; the code here works just
2483                  * as well if that isn't true, but mac80211 assumes it can
2484                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2485                  */
2486                 int align;
2487
2488                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2489                 if (align) {
2490                         if (WARN_ON(skb_headroom(skb) < 3)) {
2491                                 dev_kfree_skb(skb);
2492                                 skb = NULL;
2493                         } else {
2494                                 u8 *data = skb->data;
2495                                 size_t len = skb_headlen(skb);
2496                                 skb->data -= align;
2497                                 memmove(skb->data, data, len);
2498                                 skb_set_tail_pointer(skb, len);
2499                         }
2500                 }
2501         }
2502 #endif
2503
2504         if (skb) {
2505                 skb->protocol = eth_type_trans(skb, dev);
2506                 memset(skb->cb, 0, sizeof(skb->cb));
2507
2508                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2509         }
2510
2511         if (xmit_skb) {
2512                 /*
2513                  * Send to wireless media and increase priority by 256 to
2514                  * keep the received priority instead of reclassifying
2515                  * the frame (see cfg80211_classify8021d).
2516                  */
2517                 xmit_skb->priority += 256;
2518                 xmit_skb->protocol = htons(ETH_P_802_3);
2519                 skb_reset_network_header(xmit_skb);
2520                 skb_reset_mac_header(xmit_skb);
2521                 dev_queue_xmit(xmit_skb);
2522         }
2523 }
2524
2525 static ieee80211_rx_result debug_noinline
2526 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2527 {
2528         struct net_device *dev = rx->sdata->dev;
2529         struct sk_buff *skb = rx->skb;
2530         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2531         __le16 fc = hdr->frame_control;
2532         struct sk_buff_head frame_list;
2533         struct ethhdr ethhdr;
2534         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2535
2536         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2537                 check_da = NULL;
2538                 check_sa = NULL;
2539         } else switch (rx->sdata->vif.type) {
2540                 case NL80211_IFTYPE_AP:
2541                 case NL80211_IFTYPE_AP_VLAN:
2542                         check_da = NULL;
2543                         break;
2544                 case NL80211_IFTYPE_STATION:
2545                         if (!rx->sta ||
2546                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2547                                 check_sa = NULL;
2548                         break;
2549                 case NL80211_IFTYPE_MESH_POINT:
2550                         check_sa = NULL;
2551                         break;
2552                 default:
2553                         break;
2554         }
2555
2556         skb->dev = dev;
2557         __skb_queue_head_init(&frame_list);
2558
2559         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2560                                           rx->sdata->vif.addr,
2561                                           rx->sdata->vif.type,
2562                                           data_offset))
2563                 return RX_DROP_UNUSABLE;
2564
2565         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2566                                  rx->sdata->vif.type,
2567                                  rx->local->hw.extra_tx_headroom,
2568                                  check_da, check_sa);
2569
2570         while (!skb_queue_empty(&frame_list)) {
2571                 rx->skb = __skb_dequeue(&frame_list);
2572
2573                 if (!ieee80211_frame_allowed(rx, fc)) {
2574                         dev_kfree_skb(rx->skb);
2575                         continue;
2576                 }
2577
2578                 ieee80211_deliver_skb(rx);
2579         }
2580
2581         return RX_QUEUED;
2582 }
2583
2584 static ieee80211_rx_result debug_noinline
2585 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2586 {
2587         struct sk_buff *skb = rx->skb;
2588         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2589         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2590         __le16 fc = hdr->frame_control;
2591
2592         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2593                 return RX_CONTINUE;
2594
2595         if (unlikely(!ieee80211_is_data(fc)))
2596                 return RX_CONTINUE;
2597
2598         if (unlikely(!ieee80211_is_data_present(fc)))
2599                 return RX_DROP_MONITOR;
2600
2601         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2602                 switch (rx->sdata->vif.type) {
2603                 case NL80211_IFTYPE_AP_VLAN:
2604                         if (!rx->sdata->u.vlan.sta)
2605                                 return RX_DROP_UNUSABLE;
2606                         break;
2607                 case NL80211_IFTYPE_STATION:
2608                         if (!rx->sdata->u.mgd.use_4addr)
2609                                 return RX_DROP_UNUSABLE;
2610                         break;
2611                 default:
2612                         return RX_DROP_UNUSABLE;
2613                 }
2614         }
2615
2616         if (is_multicast_ether_addr(hdr->addr1))
2617                 return RX_DROP_UNUSABLE;
2618
2619         return __ieee80211_rx_h_amsdu(rx, 0);
2620 }
2621
2622 #ifdef CONFIG_MAC80211_MESH
2623 static ieee80211_rx_result
2624 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2625 {
2626         struct ieee80211_hdr *fwd_hdr, *hdr;
2627         struct ieee80211_tx_info *info;
2628         struct ieee80211s_hdr *mesh_hdr;
2629         struct sk_buff *skb = rx->skb, *fwd_skb;
2630         struct ieee80211_local *local = rx->local;
2631         struct ieee80211_sub_if_data *sdata = rx->sdata;
2632         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2633         u16 ac, q, hdrlen;
2634
2635         hdr = (struct ieee80211_hdr *) skb->data;
2636         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2637
2638         /* make sure fixed part of mesh header is there, also checks skb len */
2639         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2640                 return RX_DROP_MONITOR;
2641
2642         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2643
2644         /* make sure full mesh header is there, also checks skb len */
2645         if (!pskb_may_pull(rx->skb,
2646                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2647                 return RX_DROP_MONITOR;
2648
2649         /* reload pointers */
2650         hdr = (struct ieee80211_hdr *) skb->data;
2651         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2652
2653         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2654                 return RX_DROP_MONITOR;
2655
2656         /* frame is in RMC, don't forward */
2657         if (ieee80211_is_data(hdr->frame_control) &&
2658             is_multicast_ether_addr(hdr->addr1) &&
2659             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2660                 return RX_DROP_MONITOR;
2661
2662         if (!ieee80211_is_data(hdr->frame_control))
2663                 return RX_CONTINUE;
2664
2665         if (!mesh_hdr->ttl)
2666                 return RX_DROP_MONITOR;
2667
2668         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2669                 struct mesh_path *mppath;
2670                 char *proxied_addr;
2671                 char *mpp_addr;
2672
2673                 if (is_multicast_ether_addr(hdr->addr1)) {
2674                         mpp_addr = hdr->addr3;
2675                         proxied_addr = mesh_hdr->eaddr1;
2676                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2677                             MESH_FLAGS_AE_A5_A6) {
2678                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2679                         mpp_addr = hdr->addr4;
2680                         proxied_addr = mesh_hdr->eaddr2;
2681                 } else {
2682                         return RX_DROP_MONITOR;
2683                 }
2684
2685                 rcu_read_lock();
2686                 mppath = mpp_path_lookup(sdata, proxied_addr);
2687                 if (!mppath) {
2688                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2689                 } else {
2690                         spin_lock_bh(&mppath->state_lock);
2691                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2692                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2693                         mppath->exp_time = jiffies;
2694                         spin_unlock_bh(&mppath->state_lock);
2695                 }
2696                 rcu_read_unlock();
2697         }
2698
2699         /* Frame has reached destination.  Don't forward */
2700         if (!is_multicast_ether_addr(hdr->addr1) &&
2701             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2702                 return RX_CONTINUE;
2703
2704         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2705         q = sdata->vif.hw_queue[ac];
2706         if (ieee80211_queue_stopped(&local->hw, q)) {
2707                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2708                 return RX_DROP_MONITOR;
2709         }
2710         skb_set_queue_mapping(skb, q);
2711
2712         if (!--mesh_hdr->ttl) {
2713                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2714                 goto out;
2715         }
2716
2717         if (!ifmsh->mshcfg.dot11MeshForwarding)
2718                 goto out;
2719
2720         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2721                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2722         if (!fwd_skb)
2723                 goto out;
2724
2725         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2726         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2727         info = IEEE80211_SKB_CB(fwd_skb);
2728         memset(info, 0, sizeof(*info));
2729         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2730         info->control.vif = &rx->sdata->vif;
2731         info->control.jiffies = jiffies;
2732         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2733                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2734                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2735                 /* update power mode indication when forwarding */
2736                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2737         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2738                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2739                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2740         } else {
2741                 /* unable to resolve next hop */
2742                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2743                                    fwd_hdr->addr3, 0,
2744                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2745                                    fwd_hdr->addr2);
2746                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2747                 kfree_skb(fwd_skb);
2748                 return RX_DROP_MONITOR;
2749         }
2750
2751         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2752         ieee80211_add_pending_skb(local, fwd_skb);
2753  out:
2754         if (is_multicast_ether_addr(hdr->addr1))
2755                 return RX_CONTINUE;
2756         return RX_DROP_MONITOR;
2757 }
2758 #endif
2759
2760 static ieee80211_rx_result debug_noinline
2761 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2762 {
2763         struct ieee80211_sub_if_data *sdata = rx->sdata;
2764         struct ieee80211_local *local = rx->local;
2765         struct net_device *dev = sdata->dev;
2766         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2767         __le16 fc = hdr->frame_control;
2768         bool port_control;
2769         int err;
2770
2771         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2772                 return RX_CONTINUE;
2773
2774         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2775                 return RX_DROP_MONITOR;
2776
2777         /*
2778          * Send unexpected-4addr-frame event to hostapd. For older versions,
2779          * also drop the frame to cooked monitor interfaces.
2780          */
2781         if (ieee80211_has_a4(hdr->frame_control) &&
2782             sdata->vif.type == NL80211_IFTYPE_AP) {
2783                 if (rx->sta &&
2784                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2785                         cfg80211_rx_unexpected_4addr_frame(
2786                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2787                 return RX_DROP_MONITOR;
2788         }
2789
2790         err = __ieee80211_data_to_8023(rx, &port_control);
2791         if (unlikely(err))
2792                 return RX_DROP_UNUSABLE;
2793
2794         if (!ieee80211_frame_allowed(rx, fc))
2795                 return RX_DROP_MONITOR;
2796
2797         /* directly handle TDLS channel switch requests/responses */
2798         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2799                                                 cpu_to_be16(ETH_P_TDLS))) {
2800                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2801
2802                 if (pskb_may_pull(rx->skb,
2803                                   offsetof(struct ieee80211_tdls_data, u)) &&
2804                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2805                     tf->category == WLAN_CATEGORY_TDLS &&
2806                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2807                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2808                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2809                         schedule_work(&local->tdls_chsw_work);
2810                         if (rx->sta)
2811                                 rx->sta->rx_stats.packets++;
2812
2813                         return RX_QUEUED;
2814                 }
2815         }
2816
2817         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2818             unlikely(port_control) && sdata->bss) {
2819                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2820                                      u.ap);
2821                 dev = sdata->dev;
2822                 rx->sdata = sdata;
2823         }
2824
2825         rx->skb->dev = dev;
2826
2827         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2828             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2829             !is_multicast_ether_addr(
2830                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2831             (!local->scanning &&
2832              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2833                 mod_timer(&local->dynamic_ps_timer, jiffies +
2834                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2835
2836         ieee80211_deliver_skb(rx);
2837
2838         return RX_QUEUED;
2839 }
2840
2841 static ieee80211_rx_result debug_noinline
2842 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2843 {
2844         struct sk_buff *skb = rx->skb;
2845         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2846         struct tid_ampdu_rx *tid_agg_rx;
2847         u16 start_seq_num;
2848         u16 tid;
2849
2850         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2851                 return RX_CONTINUE;
2852
2853         if (ieee80211_is_back_req(bar->frame_control)) {
2854                 struct {
2855                         __le16 control, start_seq_num;
2856                 } __packed bar_data;
2857                 struct ieee80211_event event = {
2858                         .type = BAR_RX_EVENT,
2859                 };
2860
2861                 if (!rx->sta)
2862                         return RX_DROP_MONITOR;
2863
2864                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2865                                   &bar_data, sizeof(bar_data)))
2866                         return RX_DROP_MONITOR;
2867
2868                 tid = le16_to_cpu(bar_data.control) >> 12;
2869
2870                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2871                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2872                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2873                                              WLAN_BACK_RECIPIENT,
2874                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2875
2876                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2877                 if (!tid_agg_rx)
2878                         return RX_DROP_MONITOR;
2879
2880                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2881                 event.u.ba.tid = tid;
2882                 event.u.ba.ssn = start_seq_num;
2883                 event.u.ba.sta = &rx->sta->sta;
2884
2885                 /* reset session timer */
2886                 if (tid_agg_rx->timeout)
2887                         mod_timer(&tid_agg_rx->session_timer,
2888                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2889
2890                 spin_lock(&tid_agg_rx->reorder_lock);
2891                 /* release stored frames up to start of BAR */
2892                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2893                                                  start_seq_num, frames);
2894                 spin_unlock(&tid_agg_rx->reorder_lock);
2895
2896                 drv_event_callback(rx->local, rx->sdata, &event);
2897
2898                 kfree_skb(skb);
2899                 return RX_QUEUED;
2900         }
2901
2902         /*
2903          * After this point, we only want management frames,
2904          * so we can drop all remaining control frames to
2905          * cooked monitor interfaces.
2906          */
2907         return RX_DROP_MONITOR;
2908 }
2909
2910 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2911                                            struct ieee80211_mgmt *mgmt,
2912                                            size_t len)
2913 {
2914         struct ieee80211_local *local = sdata->local;
2915         struct sk_buff *skb;
2916         struct ieee80211_mgmt *resp;
2917
2918         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2919                 /* Not to own unicast address */
2920                 return;
2921         }
2922
2923         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2924             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2925                 /* Not from the current AP or not associated yet. */
2926                 return;
2927         }
2928
2929         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2930                 /* Too short SA Query request frame */
2931                 return;
2932         }
2933
2934         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2935         if (skb == NULL)
2936                 return;
2937
2938         skb_reserve(skb, local->hw.extra_tx_headroom);
2939         resp = skb_put_zero(skb, 24);
2940         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2941         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2942         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2943         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2944                                           IEEE80211_STYPE_ACTION);
2945         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2946         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2947         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2948         memcpy(resp->u.action.u.sa_query.trans_id,
2949                mgmt->u.action.u.sa_query.trans_id,
2950                WLAN_SA_QUERY_TR_ID_LEN);
2951
2952         ieee80211_tx_skb(sdata, skb);
2953 }
2954
2955 static ieee80211_rx_result debug_noinline
2956 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2957 {
2958         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2959         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2960
2961         /*
2962          * From here on, look only at management frames.
2963          * Data and control frames are already handled,
2964          * and unknown (reserved) frames are useless.
2965          */
2966         if (rx->skb->len < 24)
2967                 return RX_DROP_MONITOR;
2968
2969         if (!ieee80211_is_mgmt(mgmt->frame_control))
2970                 return RX_DROP_MONITOR;
2971
2972         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2973             ieee80211_is_beacon(mgmt->frame_control) &&
2974             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2975                 int sig = 0;
2976
2977                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2978                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2979                         sig = status->signal;
2980
2981                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2982                                             rx->skb->data, rx->skb->len,
2983                                             status->freq, sig);
2984                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2985         }
2986
2987         if (ieee80211_drop_unencrypted_mgmt(rx))
2988                 return RX_DROP_UNUSABLE;
2989
2990         return RX_CONTINUE;
2991 }
2992
2993 static ieee80211_rx_result debug_noinline
2994 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2995 {
2996         struct ieee80211_local *local = rx->local;
2997         struct ieee80211_sub_if_data *sdata = rx->sdata;
2998         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2999         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3000         int len = rx->skb->len;
3001
3002         if (!ieee80211_is_action(mgmt->frame_control))
3003                 return RX_CONTINUE;
3004
3005         /* drop too small frames */
3006         if (len < IEEE80211_MIN_ACTION_SIZE)
3007                 return RX_DROP_UNUSABLE;
3008
3009         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3010             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3011             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3012                 return RX_DROP_UNUSABLE;
3013
3014         switch (mgmt->u.action.category) {
3015         case WLAN_CATEGORY_HT:
3016                 /* reject HT action frames from stations not supporting HT */
3017                 if (!rx->sta->sta.ht_cap.ht_supported)
3018                         goto invalid;
3019
3020                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3021                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3022                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3023                     sdata->vif.type != NL80211_IFTYPE_AP &&
3024                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3025                         break;
3026
3027                 /* verify action & smps_control/chanwidth are present */
3028                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3029                         goto invalid;
3030
3031                 switch (mgmt->u.action.u.ht_smps.action) {
3032                 case WLAN_HT_ACTION_SMPS: {
3033                         struct ieee80211_supported_band *sband;
3034                         enum ieee80211_smps_mode smps_mode;
3035                         struct sta_opmode_info sta_opmode = {};
3036
3037                         /* convert to HT capability */
3038                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3039                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3040                                 smps_mode = IEEE80211_SMPS_OFF;
3041                                 break;
3042                         case WLAN_HT_SMPS_CONTROL_STATIC:
3043                                 smps_mode = IEEE80211_SMPS_STATIC;
3044                                 break;
3045                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3046                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3047                                 break;
3048                         default:
3049                                 goto invalid;
3050                         }
3051
3052                         /* if no change do nothing */
3053                         if (rx->sta->sta.smps_mode == smps_mode)
3054                                 goto handled;
3055                         rx->sta->sta.smps_mode = smps_mode;
3056                         sta_opmode.smps_mode =
3057                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3058                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3059
3060                         sband = rx->local->hw.wiphy->bands[status->band];
3061
3062                         rate_control_rate_update(local, sband, rx->sta,
3063                                                  IEEE80211_RC_SMPS_CHANGED);
3064                         cfg80211_sta_opmode_change_notify(sdata->dev,
3065                                                           rx->sta->addr,
3066                                                           &sta_opmode,
3067                                                           GFP_ATOMIC);
3068                         goto handled;
3069                 }
3070                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3071                         struct ieee80211_supported_band *sband;
3072                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3073                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3074                         struct sta_opmode_info sta_opmode = {};
3075
3076                         /* If it doesn't support 40 MHz it can't change ... */
3077                         if (!(rx->sta->sta.ht_cap.cap &
3078                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3079                                 goto handled;
3080
3081                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3082                                 max_bw = IEEE80211_STA_RX_BW_20;
3083                         else
3084                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3085
3086                         /* set cur_max_bandwidth and recalc sta bw */
3087                         rx->sta->cur_max_bandwidth = max_bw;
3088                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3089
3090                         if (rx->sta->sta.bandwidth == new_bw)
3091                                 goto handled;
3092
3093                         rx->sta->sta.bandwidth = new_bw;
3094                         sband = rx->local->hw.wiphy->bands[status->band];
3095                         sta_opmode.bw =
3096                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3097                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3098
3099                         rate_control_rate_update(local, sband, rx->sta,
3100                                                  IEEE80211_RC_BW_CHANGED);
3101                         cfg80211_sta_opmode_change_notify(sdata->dev,
3102                                                           rx->sta->addr,
3103                                                           &sta_opmode,
3104                                                           GFP_ATOMIC);
3105                         goto handled;
3106                 }
3107                 default:
3108                         goto invalid;
3109                 }
3110
3111                 break;
3112         case WLAN_CATEGORY_PUBLIC:
3113                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3114                         goto invalid;
3115                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3116                         break;
3117                 if (!rx->sta)
3118                         break;
3119                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3120                         break;
3121                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3122                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3123                         break;
3124                 if (len < offsetof(struct ieee80211_mgmt,
3125                                    u.action.u.ext_chan_switch.variable))
3126                         goto invalid;
3127                 goto queue;
3128         case WLAN_CATEGORY_VHT:
3129                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3130                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3131                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3132                     sdata->vif.type != NL80211_IFTYPE_AP &&
3133                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3134                         break;
3135
3136                 /* verify action code is present */
3137                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3138                         goto invalid;
3139
3140                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3141                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3142                         /* verify opmode is present */
3143                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3144                                 goto invalid;
3145                         goto queue;
3146                 }
3147                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3148                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3149                                 goto invalid;
3150                         goto queue;
3151                 }
3152                 default:
3153                         break;
3154                 }
3155                 break;
3156         case WLAN_CATEGORY_BACK:
3157                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3158                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3159                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3160                     sdata->vif.type != NL80211_IFTYPE_AP &&
3161                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3162                         break;
3163
3164                 /* verify action_code is present */
3165                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3166                         break;
3167
3168                 switch (mgmt->u.action.u.addba_req.action_code) {
3169                 case WLAN_ACTION_ADDBA_REQ:
3170                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3171                                    sizeof(mgmt->u.action.u.addba_req)))
3172                                 goto invalid;
3173                         break;
3174                 case WLAN_ACTION_ADDBA_RESP:
3175                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3176                                    sizeof(mgmt->u.action.u.addba_resp)))
3177                                 goto invalid;
3178                         break;
3179                 case WLAN_ACTION_DELBA:
3180                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3181                                    sizeof(mgmt->u.action.u.delba)))
3182                                 goto invalid;
3183                         break;
3184                 default:
3185                         goto invalid;
3186                 }
3187
3188                 goto queue;
3189         case WLAN_CATEGORY_SPECTRUM_MGMT:
3190                 /* verify action_code is present */
3191                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3192                         break;
3193
3194                 switch (mgmt->u.action.u.measurement.action_code) {
3195                 case WLAN_ACTION_SPCT_MSR_REQ:
3196                         if (status->band != NL80211_BAND_5GHZ)
3197                                 break;
3198
3199                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3200                                    sizeof(mgmt->u.action.u.measurement)))
3201                                 break;
3202
3203                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3204                                 break;
3205
3206                         ieee80211_process_measurement_req(sdata, mgmt, len);
3207                         goto handled;
3208                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3209                         u8 *bssid;
3210                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3211                                    sizeof(mgmt->u.action.u.chan_switch)))
3212                                 break;
3213
3214                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3215                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3216                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3217                                 break;
3218
3219                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3220                                 bssid = sdata->u.mgd.bssid;
3221                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3222                                 bssid = sdata->u.ibss.bssid;
3223                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3224                                 bssid = mgmt->sa;
3225                         else
3226                                 break;
3227
3228                         if (!ether_addr_equal(mgmt->bssid, bssid))
3229                                 break;
3230
3231                         goto queue;
3232                         }
3233                 }
3234                 break;
3235         case WLAN_CATEGORY_SA_QUERY:
3236                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3237                            sizeof(mgmt->u.action.u.sa_query)))
3238                         break;
3239
3240                 switch (mgmt->u.action.u.sa_query.action) {
3241                 case WLAN_ACTION_SA_QUERY_REQUEST:
3242                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3243                                 break;
3244                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3245                         goto handled;
3246                 }
3247                 break;
3248         case WLAN_CATEGORY_SELF_PROTECTED:
3249                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3250                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3251                         break;
3252
3253                 switch (mgmt->u.action.u.self_prot.action_code) {
3254                 case WLAN_SP_MESH_PEERING_OPEN:
3255                 case WLAN_SP_MESH_PEERING_CLOSE:
3256                 case WLAN_SP_MESH_PEERING_CONFIRM:
3257                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3258                                 goto invalid;
3259                         if (sdata->u.mesh.user_mpm)
3260                                 /* userspace handles this frame */
3261                                 break;
3262                         goto queue;
3263                 case WLAN_SP_MGK_INFORM:
3264                 case WLAN_SP_MGK_ACK:
3265                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3266                                 goto invalid;
3267                         break;
3268                 }
3269                 break;
3270         case WLAN_CATEGORY_MESH_ACTION:
3271                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3272                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3273                         break;
3274
3275                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3276                         break;
3277                 if (mesh_action_is_path_sel(mgmt) &&
3278                     !mesh_path_sel_is_hwmp(sdata))
3279                         break;
3280                 goto queue;
3281         }
3282
3283         return RX_CONTINUE;
3284
3285  invalid:
3286         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3287         /* will return in the next handlers */
3288         return RX_CONTINUE;
3289
3290  handled:
3291         if (rx->sta)
3292                 rx->sta->rx_stats.packets++;
3293         dev_kfree_skb(rx->skb);
3294         return RX_QUEUED;
3295
3296  queue:
3297         skb_queue_tail(&sdata->skb_queue, rx->skb);
3298         ieee80211_queue_work(&local->hw, &sdata->work);
3299         if (rx->sta)
3300                 rx->sta->rx_stats.packets++;
3301         return RX_QUEUED;
3302 }
3303
3304 static ieee80211_rx_result debug_noinline
3305 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3306 {
3307         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3308         int sig = 0;
3309
3310         /* skip known-bad action frames and return them in the next handler */
3311         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3312                 return RX_CONTINUE;
3313
3314         /*
3315          * Getting here means the kernel doesn't know how to handle
3316          * it, but maybe userspace does ... include returned frames
3317          * so userspace can register for those to know whether ones
3318          * it transmitted were processed or returned.
3319          */
3320
3321         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3322             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3323                 sig = status->signal;
3324
3325         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3326                              rx->skb->data, rx->skb->len, 0)) {
3327                 if (rx->sta)
3328                         rx->sta->rx_stats.packets++;
3329                 dev_kfree_skb(rx->skb);
3330                 return RX_QUEUED;
3331         }
3332
3333         return RX_CONTINUE;
3334 }
3335
3336 static ieee80211_rx_result debug_noinline
3337 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3338 {
3339         struct ieee80211_local *local = rx->local;
3340         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3341         struct sk_buff *nskb;
3342         struct ieee80211_sub_if_data *sdata = rx->sdata;
3343         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3344
3345         if (!ieee80211_is_action(mgmt->frame_control))
3346                 return RX_CONTINUE;
3347
3348         /*
3349          * For AP mode, hostapd is responsible for handling any action
3350          * frames that we didn't handle, including returning unknown
3351          * ones. For all other modes we will return them to the sender,
3352          * setting the 0x80 bit in the action category, as required by
3353          * 802.11-2012 9.24.4.
3354          * Newer versions of hostapd shall also use the management frame
3355          * registration mechanisms, but older ones still use cooked
3356          * monitor interfaces so push all frames there.
3357          */
3358         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3359             (sdata->vif.type == NL80211_IFTYPE_AP ||
3360              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3361                 return RX_DROP_MONITOR;
3362
3363         if (is_multicast_ether_addr(mgmt->da))
3364                 return RX_DROP_MONITOR;
3365
3366         /* do not return rejected action frames */
3367         if (mgmt->u.action.category & 0x80)
3368                 return RX_DROP_UNUSABLE;
3369
3370         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3371                                GFP_ATOMIC);
3372         if (nskb) {
3373                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3374
3375                 nmgmt->u.action.category |= 0x80;
3376                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3377                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3378
3379                 memset(nskb->cb, 0, sizeof(nskb->cb));
3380
3381                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3382                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3383
3384                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3385                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3386                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3387                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3388                                 info->hw_queue =
3389                                         local->hw.offchannel_tx_hw_queue;
3390                 }
3391
3392                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3393                                             status->band, 0);
3394         }
3395         dev_kfree_skb(rx->skb);
3396         return RX_QUEUED;
3397 }
3398
3399 static ieee80211_rx_result debug_noinline
3400 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3401 {
3402         struct ieee80211_sub_if_data *sdata = rx->sdata;
3403         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3404         __le16 stype;
3405
3406         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3407
3408         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3409             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3410             sdata->vif.type != NL80211_IFTYPE_OCB &&
3411             sdata->vif.type != NL80211_IFTYPE_STATION)
3412                 return RX_DROP_MONITOR;
3413
3414         switch (stype) {
3415         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3416         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3417         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3418                 /* process for all: mesh, mlme, ibss */
3419                 break;
3420         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3421         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3422         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3423         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3424                 if (is_multicast_ether_addr(mgmt->da) &&
3425                     !is_broadcast_ether_addr(mgmt->da))
3426                         return RX_DROP_MONITOR;
3427
3428                 /* process only for station */
3429                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3430                         return RX_DROP_MONITOR;
3431                 break;
3432         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3433                 /* process only for ibss and mesh */
3434                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3435                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3436                         return RX_DROP_MONITOR;
3437                 break;
3438         default:
3439                 return RX_DROP_MONITOR;
3440         }
3441
3442         /* queue up frame and kick off work to process it */
3443         skb_queue_tail(&sdata->skb_queue, rx->skb);
3444         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3445         if (rx->sta)
3446                 rx->sta->rx_stats.packets++;
3447
3448         return RX_QUEUED;
3449 }
3450
3451 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3452                                         struct ieee80211_rate *rate)
3453 {
3454         struct ieee80211_sub_if_data *sdata;
3455         struct ieee80211_local *local = rx->local;
3456         struct sk_buff *skb = rx->skb, *skb2;
3457         struct net_device *prev_dev = NULL;
3458         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3459         int needed_headroom;
3460
3461         /*
3462          * If cooked monitor has been processed already, then
3463          * don't do it again. If not, set the flag.
3464          */
3465         if (rx->flags & IEEE80211_RX_CMNTR)
3466                 goto out_free_skb;
3467         rx->flags |= IEEE80211_RX_CMNTR;
3468
3469         /* If there are no cooked monitor interfaces, just free the SKB */
3470         if (!local->cooked_mntrs)
3471                 goto out_free_skb;
3472
3473         /* vendor data is long removed here */
3474         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3475         /* room for the radiotap header based on driver features */
3476         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3477
3478         if (skb_headroom(skb) < needed_headroom &&
3479             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3480                 goto out_free_skb;
3481
3482         /* prepend radiotap information */
3483         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3484                                          false);
3485
3486         skb_reset_mac_header(skb);
3487         skb->ip_summed = CHECKSUM_UNNECESSARY;
3488         skb->pkt_type = PACKET_OTHERHOST;
3489         skb->protocol = htons(ETH_P_802_2);
3490
3491         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3492                 if (!ieee80211_sdata_running(sdata))
3493                         continue;
3494
3495                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3496                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3497                         continue;
3498
3499                 if (prev_dev) {
3500                         skb2 = skb_clone(skb, GFP_ATOMIC);
3501                         if (skb2) {
3502                                 skb2->dev = prev_dev;
3503                                 netif_receive_skb(skb2);
3504                         }
3505                 }
3506
3507                 prev_dev = sdata->dev;
3508                 ieee80211_rx_stats(sdata->dev, skb->len);
3509         }
3510
3511         if (prev_dev) {
3512                 skb->dev = prev_dev;
3513                 netif_receive_skb(skb);
3514                 return;
3515         }
3516
3517  out_free_skb:
3518         dev_kfree_skb(skb);
3519 }
3520
3521 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3522                                          ieee80211_rx_result res)
3523 {
3524         switch (res) {
3525         case RX_DROP_MONITOR:
3526                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3527                 if (rx->sta)
3528                         rx->sta->rx_stats.dropped++;
3529                 /* fall through */
3530         case RX_CONTINUE: {
3531                 struct ieee80211_rate *rate = NULL;
3532                 struct ieee80211_supported_band *sband;
3533                 struct ieee80211_rx_status *status;
3534
3535                 status = IEEE80211_SKB_RXCB((rx->skb));
3536
3537                 sband = rx->local->hw.wiphy->bands[status->band];
3538                 if (status->encoding == RX_ENC_LEGACY)
3539                         rate = &sband->bitrates[status->rate_idx];
3540
3541                 ieee80211_rx_cooked_monitor(rx, rate);
3542                 break;
3543                 }
3544         case RX_DROP_UNUSABLE:
3545                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3546                 if (rx->sta)
3547                         rx->sta->rx_stats.dropped++;
3548                 dev_kfree_skb(rx->skb);
3549                 break;
3550         case RX_QUEUED:
3551                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3552                 break;
3553         }
3554 }
3555
3556 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3557                                   struct sk_buff_head *frames)
3558 {
3559         ieee80211_rx_result res = RX_DROP_MONITOR;
3560         struct sk_buff *skb;
3561
3562 #define CALL_RXH(rxh)                   \
3563         do {                            \
3564                 res = rxh(rx);          \
3565                 if (res != RX_CONTINUE) \
3566                         goto rxh_next;  \
3567         } while (0)
3568
3569         /* Lock here to avoid hitting all of the data used in the RX
3570          * path (e.g. key data, station data, ...) concurrently when
3571          * a frame is released from the reorder buffer due to timeout
3572          * from the timer, potentially concurrently with RX from the
3573          * driver.
3574          */
3575         spin_lock_bh(&rx->local->rx_path_lock);
3576
3577         while ((skb = __skb_dequeue(frames))) {
3578                 /*
3579                  * all the other fields are valid across frames
3580                  * that belong to an aMPDU since they are on the
3581                  * same TID from the same station
3582                  */
3583                 rx->skb = skb;
3584
3585                 CALL_RXH(ieee80211_rx_h_check_more_data);
3586                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3587                 CALL_RXH(ieee80211_rx_h_sta_process);
3588                 CALL_RXH(ieee80211_rx_h_decrypt);
3589                 CALL_RXH(ieee80211_rx_h_defragment);
3590                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3591                 /* must be after MMIC verify so header is counted in MPDU mic */
3592 #ifdef CONFIG_MAC80211_MESH
3593                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3594                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3595 #endif
3596                 CALL_RXH(ieee80211_rx_h_amsdu);
3597                 CALL_RXH(ieee80211_rx_h_data);
3598
3599                 /* special treatment -- needs the queue */
3600                 res = ieee80211_rx_h_ctrl(rx, frames);
3601                 if (res != RX_CONTINUE)
3602                         goto rxh_next;
3603
3604                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3605                 CALL_RXH(ieee80211_rx_h_action);
3606                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3607                 CALL_RXH(ieee80211_rx_h_action_return);
3608                 CALL_RXH(ieee80211_rx_h_mgmt);
3609
3610  rxh_next:
3611                 ieee80211_rx_handlers_result(rx, res);
3612
3613 #undef CALL_RXH
3614         }
3615
3616         spin_unlock_bh(&rx->local->rx_path_lock);
3617 }
3618
3619 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3620 {
3621         struct sk_buff_head reorder_release;
3622         ieee80211_rx_result res = RX_DROP_MONITOR;
3623
3624         __skb_queue_head_init(&reorder_release);
3625
3626 #define CALL_RXH(rxh)                   \
3627         do {                            \
3628                 res = rxh(rx);          \
3629                 if (res != RX_CONTINUE) \
3630                         goto rxh_next;  \
3631         } while (0)
3632
3633         CALL_RXH(ieee80211_rx_h_check_dup);
3634         CALL_RXH(ieee80211_rx_h_check);
3635
3636         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3637
3638         ieee80211_rx_handlers(rx, &reorder_release);
3639         return;
3640
3641  rxh_next:
3642         ieee80211_rx_handlers_result(rx, res);
3643
3644 #undef CALL_RXH
3645 }
3646
3647 /*
3648  * This function makes calls into the RX path, therefore
3649  * it has to be invoked under RCU read lock.
3650  */
3651 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3652 {
3653         struct sk_buff_head frames;
3654         struct ieee80211_rx_data rx = {
3655                 .sta = sta,
3656                 .sdata = sta->sdata,
3657                 .local = sta->local,
3658                 /* This is OK -- must be QoS data frame */
3659                 .security_idx = tid,
3660                 .seqno_idx = tid,
3661                 .napi = NULL, /* must be NULL to not have races */
3662         };
3663         struct tid_ampdu_rx *tid_agg_rx;
3664
3665         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3666         if (!tid_agg_rx)
3667                 return;
3668
3669         __skb_queue_head_init(&frames);
3670
3671         spin_lock(&tid_agg_rx->reorder_lock);
3672         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3673         spin_unlock(&tid_agg_rx->reorder_lock);
3674
3675         if (!skb_queue_empty(&frames)) {
3676                 struct ieee80211_event event = {
3677                         .type = BA_FRAME_TIMEOUT,
3678                         .u.ba.tid = tid,
3679                         .u.ba.sta = &sta->sta,
3680                 };
3681                 drv_event_callback(rx.local, rx.sdata, &event);
3682         }
3683
3684         ieee80211_rx_handlers(&rx, &frames);
3685 }
3686
3687 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3688                                           u16 ssn, u64 filtered,
3689                                           u16 received_mpdus)
3690 {
3691         struct sta_info *sta;
3692         struct tid_ampdu_rx *tid_agg_rx;
3693         struct sk_buff_head frames;
3694         struct ieee80211_rx_data rx = {
3695                 /* This is OK -- must be QoS data frame */
3696                 .security_idx = tid,
3697                 .seqno_idx = tid,
3698         };
3699         int i, diff;
3700
3701         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3702                 return;
3703
3704         __skb_queue_head_init(&frames);
3705
3706         sta = container_of(pubsta, struct sta_info, sta);
3707
3708         rx.sta = sta;
3709         rx.sdata = sta->sdata;
3710         rx.local = sta->local;
3711
3712         rcu_read_lock();
3713         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3714         if (!tid_agg_rx)
3715                 goto out;
3716
3717         spin_lock_bh(&tid_agg_rx->reorder_lock);
3718
3719         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3720                 int release;
3721
3722                 /* release all frames in the reorder buffer */
3723                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3724                            IEEE80211_SN_MODULO;
3725                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3726                                                  release, &frames);
3727                 /* update ssn to match received ssn */
3728                 tid_agg_rx->head_seq_num = ssn;
3729         } else {
3730                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3731                                                  &frames);
3732         }
3733
3734         /* handle the case that received ssn is behind the mac ssn.
3735          * it can be tid_agg_rx->buf_size behind and still be valid */
3736         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3737         if (diff >= tid_agg_rx->buf_size) {
3738                 tid_agg_rx->reorder_buf_filtered = 0;
3739                 goto release;
3740         }
3741         filtered = filtered >> diff;
3742         ssn += diff;
3743
3744         /* update bitmap */
3745         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3746                 int index = (ssn + i) % tid_agg_rx->buf_size;
3747
3748                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3749                 if (filtered & BIT_ULL(i))
3750                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3751         }
3752
3753         /* now process also frames that the filter marking released */
3754         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3755
3756 release:
3757         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3758
3759         ieee80211_rx_handlers(&rx, &frames);
3760
3761  out:
3762         rcu_read_unlock();
3763 }
3764 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3765
3766 /* main receive path */
3767
3768 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3769 {
3770         struct ieee80211_sub_if_data *sdata = rx->sdata;
3771         struct sk_buff *skb = rx->skb;
3772         struct ieee80211_hdr *hdr = (void *)skb->data;
3773         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3774         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3775         bool multicast = is_multicast_ether_addr(hdr->addr1);
3776
3777         switch (sdata->vif.type) {
3778         case NL80211_IFTYPE_STATION:
3779                 if (!bssid && !sdata->u.mgd.use_4addr)
3780                         return false;
3781                 if (multicast)
3782                         return true;
3783                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3784         case NL80211_IFTYPE_ADHOC:
3785                 if (!bssid)
3786                         return false;
3787                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3788                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3789                         return false;
3790                 if (ieee80211_is_beacon(hdr->frame_control))
3791                         return true;
3792                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3793                         return false;
3794                 if (!multicast &&
3795                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3796                         return false;
3797                 if (!rx->sta) {
3798                         int rate_idx;
3799                         if (status->encoding != RX_ENC_LEGACY)
3800                                 rate_idx = 0; /* TODO: HT/VHT rates */
3801                         else
3802                                 rate_idx = status->rate_idx;
3803                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3804                                                  BIT(rate_idx));
3805                 }
3806                 return true;
3807         case NL80211_IFTYPE_OCB:
3808                 if (!bssid)
3809                         return false;
3810                 if (!ieee80211_is_data_present(hdr->frame_control))
3811                         return false;
3812                 if (!is_broadcast_ether_addr(bssid))
3813                         return false;
3814                 if (!multicast &&
3815                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3816                         return false;
3817                 if (!rx->sta) {
3818                         int rate_idx;
3819                         if (status->encoding != RX_ENC_LEGACY)
3820                                 rate_idx = 0; /* TODO: HT rates */
3821                         else
3822                                 rate_idx = status->rate_idx;
3823                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3824                                                 BIT(rate_idx));
3825                 }
3826                 return true;
3827         case NL80211_IFTYPE_MESH_POINT:
3828                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3829                         return false;
3830                 if (multicast)
3831                         return true;
3832                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3833         case NL80211_IFTYPE_AP_VLAN:
3834         case NL80211_IFTYPE_AP:
3835                 if (!bssid)
3836                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3837
3838                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3839                         /*
3840                          * Accept public action frames even when the
3841                          * BSSID doesn't match, this is used for P2P
3842                          * and location updates. Note that mac80211
3843                          * itself never looks at these frames.
3844                          */
3845                         if (!multicast &&
3846                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3847                                 return false;
3848                         if (ieee80211_is_public_action(hdr, skb->len))
3849                                 return true;
3850                         return ieee80211_is_beacon(hdr->frame_control);
3851                 }
3852
3853                 if (!ieee80211_has_tods(hdr->frame_control)) {
3854                         /* ignore data frames to TDLS-peers */
3855                         if (ieee80211_is_data(hdr->frame_control))
3856                                 return false;
3857                         /* ignore action frames to TDLS-peers */
3858                         if (ieee80211_is_action(hdr->frame_control) &&
3859                             !is_broadcast_ether_addr(bssid) &&
3860                             !ether_addr_equal(bssid, hdr->addr1))
3861                                 return false;
3862                 }
3863
3864                 /*
3865                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3866                  * the BSSID - we've checked that already but may have accepted
3867                  * the wildcard (ff:ff:ff:ff:ff:ff).
3868                  *
3869                  * It also says:
3870                  *      The BSSID of the Data frame is determined as follows:
3871                  *      a) If the STA is contained within an AP or is associated
3872                  *         with an AP, the BSSID is the address currently in use
3873                  *         by the STA contained in the AP.
3874                  *
3875                  * So we should not accept data frames with an address that's
3876                  * multicast.
3877                  *
3878                  * Accepting it also opens a security problem because stations
3879                  * could encrypt it with the GTK and inject traffic that way.
3880                  */
3881                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3882                         return false;
3883
3884                 return true;
3885         case NL80211_IFTYPE_WDS:
3886                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3887                         return false;
3888                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3889         case NL80211_IFTYPE_P2P_DEVICE:
3890                 return ieee80211_is_public_action(hdr, skb->len) ||
3891                        ieee80211_is_probe_req(hdr->frame_control) ||
3892                        ieee80211_is_probe_resp(hdr->frame_control) ||
3893                        ieee80211_is_beacon(hdr->frame_control);
3894         case NL80211_IFTYPE_NAN:
3895                 /* Currently no frames on NAN interface are allowed */
3896                 return false;
3897         default:
3898                 break;
3899         }
3900
3901         WARN_ON_ONCE(1);
3902         return false;
3903 }
3904
3905 void ieee80211_check_fast_rx(struct sta_info *sta)
3906 {
3907         struct ieee80211_sub_if_data *sdata = sta->sdata;
3908         struct ieee80211_local *local = sdata->local;
3909         struct ieee80211_key *key;
3910         struct ieee80211_fast_rx fastrx = {
3911                 .dev = sdata->dev,
3912                 .vif_type = sdata->vif.type,
3913                 .control_port_protocol = sdata->control_port_protocol,
3914         }, *old, *new = NULL;
3915         bool assign = false;
3916
3917         /* use sparse to check that we don't return without updating */
3918         __acquire(check_fast_rx);
3919
3920         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3921         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3922         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3923         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3924
3925         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3926
3927         /* fast-rx doesn't do reordering */
3928         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3929             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3930                 goto clear;
3931
3932         switch (sdata->vif.type) {
3933         case NL80211_IFTYPE_STATION:
3934                 if (sta->sta.tdls) {
3935                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3936                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3937                         fastrx.expected_ds_bits = 0;
3938                 } else {
3939                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3940                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3941                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3942                         fastrx.expected_ds_bits =
3943                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3944                 }
3945
3946                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3947                         fastrx.expected_ds_bits |=
3948                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3949                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3950                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3951                 }
3952
3953                 if (!sdata->u.mgd.powersave)
3954                         break;
3955
3956                 /* software powersave is a huge mess, avoid all of it */
3957                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3958                         goto clear;
3959                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3960                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3961                         goto clear;
3962                 break;
3963         case NL80211_IFTYPE_AP_VLAN:
3964         case NL80211_IFTYPE_AP:
3965                 /* parallel-rx requires this, at least with calls to
3966                  * ieee80211_sta_ps_transition()
3967                  */
3968                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3969                         goto clear;
3970                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3971                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3972                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3973
3974                 fastrx.internal_forward =
3975                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3976                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3977                          !sdata->u.vlan.sta);
3978
3979                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3980                     sdata->u.vlan.sta) {
3981                         fastrx.expected_ds_bits |=
3982                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3983                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3984                         fastrx.internal_forward = 0;
3985                 }
3986
3987                 break;
3988         default:
3989                 goto clear;
3990         }
3991
3992         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3993                 goto clear;
3994
3995         rcu_read_lock();
3996         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3997         if (key) {
3998                 switch (key->conf.cipher) {
3999                 case WLAN_CIPHER_SUITE_TKIP:
4000                         /* we don't want to deal with MMIC in fast-rx */
4001                         goto clear_rcu;
4002                 case WLAN_CIPHER_SUITE_CCMP:
4003                 case WLAN_CIPHER_SUITE_CCMP_256:
4004                 case WLAN_CIPHER_SUITE_GCMP:
4005                 case WLAN_CIPHER_SUITE_GCMP_256:
4006                         break;
4007                 default:
4008                         /* we also don't want to deal with WEP or cipher scheme
4009                          * since those require looking up the key idx in the
4010                          * frame, rather than assuming the PTK is used
4011                          * (we need to revisit this once we implement the real
4012                          * PTK index, which is now valid in the spec, but we
4013                          * haven't implemented that part yet)
4014                          */
4015                         goto clear_rcu;
4016                 }
4017
4018                 fastrx.key = true;
4019                 fastrx.icv_len = key->conf.icv_len;
4020         }
4021
4022         assign = true;
4023  clear_rcu:
4024         rcu_read_unlock();
4025  clear:
4026         __release(check_fast_rx);
4027
4028         if (assign)
4029                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4030
4031         spin_lock_bh(&sta->lock);
4032         old = rcu_dereference_protected(sta->fast_rx, true);
4033         rcu_assign_pointer(sta->fast_rx, new);
4034         spin_unlock_bh(&sta->lock);
4035
4036         if (old)
4037                 kfree_rcu(old, rcu_head);
4038 }
4039
4040 void ieee80211_clear_fast_rx(struct sta_info *sta)
4041 {
4042         struct ieee80211_fast_rx *old;
4043
4044         spin_lock_bh(&sta->lock);
4045         old = rcu_dereference_protected(sta->fast_rx, true);
4046         RCU_INIT_POINTER(sta->fast_rx, NULL);
4047         spin_unlock_bh(&sta->lock);
4048
4049         if (old)
4050                 kfree_rcu(old, rcu_head);
4051 }
4052
4053 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4054 {
4055         struct ieee80211_local *local = sdata->local;
4056         struct sta_info *sta;
4057
4058         lockdep_assert_held(&local->sta_mtx);
4059
4060         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4061                 if (sdata != sta->sdata &&
4062                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4063                         continue;
4064                 ieee80211_check_fast_rx(sta);
4065         }
4066 }
4067
4068 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4069 {
4070         struct ieee80211_local *local = sdata->local;
4071
4072         mutex_lock(&local->sta_mtx);
4073         __ieee80211_check_fast_rx_iface(sdata);
4074         mutex_unlock(&local->sta_mtx);
4075 }
4076
4077 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4078                                      struct ieee80211_fast_rx *fast_rx)
4079 {
4080         struct sk_buff *skb = rx->skb;
4081         struct ieee80211_hdr *hdr = (void *)skb->data;
4082         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4083         struct sta_info *sta = rx->sta;
4084         int orig_len = skb->len;
4085         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4086         int snap_offs = hdrlen;
4087         struct {
4088                 u8 snap[sizeof(rfc1042_header)];
4089                 __be16 proto;
4090         } *payload __aligned(2);
4091         struct {
4092                 u8 da[ETH_ALEN];
4093                 u8 sa[ETH_ALEN];
4094         } addrs __aligned(2);
4095         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4096
4097         if (fast_rx->uses_rss)
4098                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4099
4100         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4101          * to a common data structure; drivers can implement that per queue
4102          * but we don't have that information in mac80211
4103          */
4104         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4105                 return false;
4106
4107 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4108
4109         /* If using encryption, we also need to have:
4110          *  - PN_VALIDATED: similar, but the implementation is tricky
4111          *  - DECRYPTED: necessary for PN_VALIDATED
4112          */
4113         if (fast_rx->key &&
4114             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4115                 return false;
4116
4117         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4118                 return false;
4119
4120         if (unlikely(ieee80211_is_frag(hdr)))
4121                 return false;
4122
4123         /* Since our interface address cannot be multicast, this
4124          * implicitly also rejects multicast frames without the
4125          * explicit check.
4126          *
4127          * We shouldn't get any *data* frames not addressed to us
4128          * (AP mode will accept multicast *management* frames), but
4129          * punting here will make it go through the full checks in
4130          * ieee80211_accept_frame().
4131          */
4132         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4133                 return false;
4134
4135         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4136                                               IEEE80211_FCTL_TODS)) !=
4137             fast_rx->expected_ds_bits)
4138                 return false;
4139
4140         /* assign the key to drop unencrypted frames (later)
4141          * and strip the IV/MIC if necessary
4142          */
4143         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4144                 /* GCMP header length is the same */
4145                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4146         }
4147
4148         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4149                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4150                         goto drop;
4151
4152                 payload = (void *)(skb->data + snap_offs);
4153
4154                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4155                         return false;
4156
4157                 /* Don't handle these here since they require special code.
4158                  * Accept AARP and IPX even though they should come with a
4159                  * bridge-tunnel header - but if we get them this way then
4160                  * there's little point in discarding them.
4161                  */
4162                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4163                              payload->proto == fast_rx->control_port_protocol))
4164                         return false;
4165         }
4166
4167         /* after this point, don't punt to the slowpath! */
4168
4169         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4170             pskb_trim(skb, skb->len - fast_rx->icv_len))
4171                 goto drop;
4172
4173         if (unlikely(fast_rx->sta_notify)) {
4174                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4175                 fast_rx->sta_notify = false;
4176         }
4177
4178         /* statistics part of ieee80211_rx_h_sta_process() */
4179         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4180                 stats->last_signal = status->signal;
4181                 if (!fast_rx->uses_rss)
4182                         ewma_signal_add(&sta->rx_stats_avg.signal,
4183                                         -status->signal);
4184         }
4185
4186         if (status->chains) {
4187                 int i;
4188
4189                 stats->chains = status->chains;
4190                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4191                         int signal = status->chain_signal[i];
4192
4193                         if (!(status->chains & BIT(i)))
4194                                 continue;
4195
4196                         stats->chain_signal_last[i] = signal;
4197                         if (!fast_rx->uses_rss)
4198                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4199                                                 -signal);
4200                 }
4201         }
4202         /* end of statistics */
4203
4204         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4205                 goto drop;
4206
4207         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4208                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4209                     RX_QUEUED)
4210                         goto drop;
4211
4212                 return true;
4213         }
4214
4215         stats->last_rx = jiffies;
4216         stats->last_rate = sta_stats_encode_rate(status);
4217
4218         stats->fragments++;
4219         stats->packets++;
4220
4221         /* do the header conversion - first grab the addresses */
4222         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4223         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4224         /* remove the SNAP but leave the ethertype */
4225         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4226         /* push the addresses in front */
4227         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4228
4229         skb->dev = fast_rx->dev;
4230
4231         ieee80211_rx_stats(fast_rx->dev, skb->len);
4232
4233         /* The seqno index has the same property as needed
4234          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4235          * for non-QoS-data frames. Here we know it's a data
4236          * frame, so count MSDUs.
4237          */
4238         u64_stats_update_begin(&stats->syncp);
4239         stats->msdu[rx->seqno_idx]++;
4240         stats->bytes += orig_len;
4241         u64_stats_update_end(&stats->syncp);
4242
4243         if (fast_rx->internal_forward) {
4244                 struct sk_buff *xmit_skb = NULL;
4245                 if (is_multicast_ether_addr(addrs.da)) {
4246                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4247                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4248                            sta_info_get(rx->sdata, addrs.da)) {
4249                         xmit_skb = skb;
4250                         skb = NULL;
4251                 }
4252
4253                 if (xmit_skb) {
4254                         /*
4255                          * Send to wireless media and increase priority by 256
4256                          * to keep the received priority instead of
4257                          * reclassifying the frame (see cfg80211_classify8021d).
4258                          */
4259                         xmit_skb->priority += 256;
4260                         xmit_skb->protocol = htons(ETH_P_802_3);
4261                         skb_reset_network_header(xmit_skb);
4262                         skb_reset_mac_header(xmit_skb);
4263                         dev_queue_xmit(xmit_skb);
4264                 }
4265
4266                 if (!skb)
4267                         return true;
4268         }
4269
4270         /* deliver to local stack */
4271         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4272         memset(skb->cb, 0, sizeof(skb->cb));
4273         if (rx->napi)
4274                 napi_gro_receive(rx->napi, skb);
4275         else
4276                 netif_receive_skb(skb);
4277
4278         return true;
4279  drop:
4280         dev_kfree_skb(skb);
4281         stats->dropped++;
4282         return true;
4283 }
4284
4285 /*
4286  * This function returns whether or not the SKB
4287  * was destined for RX processing or not, which,
4288  * if consume is true, is equivalent to whether
4289  * or not the skb was consumed.
4290  */
4291 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4292                                             struct sk_buff *skb, bool consume)
4293 {
4294         struct ieee80211_local *local = rx->local;
4295         struct ieee80211_sub_if_data *sdata = rx->sdata;
4296
4297         rx->skb = skb;
4298
4299         /* See if we can do fast-rx; if we have to copy we already lost,
4300          * so punt in that case. We should never have to deliver a data
4301          * frame to multiple interfaces anyway.
4302          *
4303          * We skip the ieee80211_accept_frame() call and do the necessary
4304          * checking inside ieee80211_invoke_fast_rx().
4305          */
4306         if (consume && rx->sta) {
4307                 struct ieee80211_fast_rx *fast_rx;
4308
4309                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4310                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4311                         return true;
4312         }
4313
4314         if (!ieee80211_accept_frame(rx))
4315                 return false;
4316
4317         if (!consume) {
4318                 skb = skb_copy(skb, GFP_ATOMIC);
4319                 if (!skb) {
4320                         if (net_ratelimit())
4321                                 wiphy_debug(local->hw.wiphy,
4322                                         "failed to copy skb for %s\n",
4323                                         sdata->name);
4324                         return true;
4325                 }
4326
4327                 rx->skb = skb;
4328         }
4329
4330         ieee80211_invoke_rx_handlers(rx);
4331         return true;
4332 }
4333
4334 /*
4335  * This is the actual Rx frames handler. as it belongs to Rx path it must
4336  * be called with rcu_read_lock protection.
4337  */
4338 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4339                                          struct ieee80211_sta *pubsta,
4340                                          struct sk_buff *skb,
4341                                          struct napi_struct *napi)
4342 {
4343         struct ieee80211_local *local = hw_to_local(hw);
4344         struct ieee80211_sub_if_data *sdata;
4345         struct ieee80211_hdr *hdr;
4346         __le16 fc;
4347         struct ieee80211_rx_data rx;
4348         struct ieee80211_sub_if_data *prev;
4349         struct rhlist_head *tmp;
4350         int err = 0;
4351
4352         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4353         memset(&rx, 0, sizeof(rx));
4354         rx.skb = skb;
4355         rx.local = local;
4356         rx.napi = napi;
4357
4358         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4359                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4360
4361         if (ieee80211_is_mgmt(fc)) {
4362                 /* drop frame if too short for header */
4363                 if (skb->len < ieee80211_hdrlen(fc))
4364                         err = -ENOBUFS;
4365                 else
4366                         err = skb_linearize(skb);
4367         } else {
4368                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4369         }
4370
4371         if (err) {
4372                 dev_kfree_skb(skb);
4373                 return;
4374         }
4375
4376         hdr = (struct ieee80211_hdr *)skb->data;
4377         ieee80211_parse_qos(&rx);
4378         ieee80211_verify_alignment(&rx);
4379
4380         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4381                      ieee80211_is_beacon(hdr->frame_control)))
4382                 ieee80211_scan_rx(local, skb);
4383
4384         if (ieee80211_is_data(fc)) {
4385                 struct sta_info *sta, *prev_sta;
4386
4387                 if (pubsta) {
4388                         rx.sta = container_of(pubsta, struct sta_info, sta);
4389                         rx.sdata = rx.sta->sdata;
4390                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4391                                 return;
4392                         goto out;
4393                 }
4394
4395                 prev_sta = NULL;
4396
4397                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4398                         if (!prev_sta) {
4399                                 prev_sta = sta;
4400                                 continue;
4401                         }
4402
4403                         rx.sta = prev_sta;
4404                         rx.sdata = prev_sta->sdata;
4405                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4406
4407                         prev_sta = sta;
4408                 }
4409
4410                 if (prev_sta) {
4411                         rx.sta = prev_sta;
4412                         rx.sdata = prev_sta->sdata;
4413
4414                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4415                                 return;
4416                         goto out;
4417                 }
4418         }
4419
4420         prev = NULL;
4421
4422         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4423                 if (!ieee80211_sdata_running(sdata))
4424                         continue;
4425
4426                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4427                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4428                         continue;
4429
4430                 /*
4431                  * frame is destined for this interface, but if it's
4432                  * not also for the previous one we handle that after
4433                  * the loop to avoid copying the SKB once too much
4434                  */
4435
4436                 if (!prev) {
4437                         prev = sdata;
4438                         continue;
4439                 }
4440
4441                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4442                 rx.sdata = prev;
4443                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4444
4445                 prev = sdata;
4446         }
4447
4448         if (prev) {
4449                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4450                 rx.sdata = prev;
4451
4452                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4453                         return;
4454         }
4455
4456  out:
4457         dev_kfree_skb(skb);
4458 }
4459
4460 /*
4461  * This is the receive path handler. It is called by a low level driver when an
4462  * 802.11 MPDU is received from the hardware.
4463  */
4464 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4465                        struct sk_buff *skb, struct napi_struct *napi)
4466 {
4467         struct ieee80211_local *local = hw_to_local(hw);
4468         struct ieee80211_rate *rate = NULL;
4469         struct ieee80211_supported_band *sband;
4470         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4471
4472         WARN_ON_ONCE(softirq_count() == 0);
4473
4474         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4475                 goto drop;
4476
4477         sband = local->hw.wiphy->bands[status->band];
4478         if (WARN_ON(!sband))
4479                 goto drop;
4480
4481         /*
4482          * If we're suspending, it is possible although not too likely
4483          * that we'd be receiving frames after having already partially
4484          * quiesced the stack. We can't process such frames then since
4485          * that might, for example, cause stations to be added or other
4486          * driver callbacks be invoked.
4487          */
4488         if (unlikely(local->quiescing || local->suspended))
4489                 goto drop;
4490
4491         /* We might be during a HW reconfig, prevent Rx for the same reason */
4492         if (unlikely(local->in_reconfig))
4493                 goto drop;
4494
4495         /*
4496          * The same happens when we're not even started,
4497          * but that's worth a warning.
4498          */
4499         if (WARN_ON(!local->started))
4500                 goto drop;
4501
4502         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4503                 /*
4504                  * Validate the rate, unless a PLCP error means that
4505                  * we probably can't have a valid rate here anyway.
4506                  */
4507
4508                 switch (status->encoding) {
4509                 case RX_ENC_HT:
4510                         /*
4511                          * rate_idx is MCS index, which can be [0-76]
4512                          * as documented on:
4513                          *
4514                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4515                          *
4516                          * Anything else would be some sort of driver or
4517                          * hardware error. The driver should catch hardware
4518                          * errors.
4519                          */
4520                         if (WARN(status->rate_idx > 76,
4521                                  "Rate marked as an HT rate but passed "
4522                                  "status->rate_idx is not "
4523                                  "an MCS index [0-76]: %d (0x%02x)\n",
4524                                  status->rate_idx,
4525                                  status->rate_idx))
4526                                 goto drop;
4527                         break;
4528                 case RX_ENC_VHT:
4529                         if (WARN_ONCE(status->rate_idx > 9 ||
4530                                       !status->nss ||
4531                                       status->nss > 8,
4532                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4533                                       status->rate_idx, status->nss))
4534                                 goto drop;
4535                         break;
4536                 case RX_ENC_HE:
4537                         if (WARN_ONCE(status->rate_idx > 11 ||
4538                                       !status->nss ||
4539                                       status->nss > 8,
4540                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4541                                       status->rate_idx, status->nss))
4542                                 goto drop;
4543                         break;
4544                 default:
4545                         WARN_ON_ONCE(1);
4546                         /* fall through */
4547                 case RX_ENC_LEGACY:
4548                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4549                                 goto drop;
4550                         rate = &sband->bitrates[status->rate_idx];
4551                 }
4552         }
4553
4554         status->rx_flags = 0;
4555
4556         /*
4557          * key references and virtual interfaces are protected using RCU
4558          * and this requires that we are in a read-side RCU section during
4559          * receive processing
4560          */
4561         rcu_read_lock();
4562
4563         /*
4564          * Frames with failed FCS/PLCP checksum are not returned,
4565          * all other frames are returned without radiotap header
4566          * if it was previously present.
4567          * Also, frames with less than 16 bytes are dropped.
4568          */
4569         skb = ieee80211_rx_monitor(local, skb, rate);
4570         if (!skb) {
4571                 rcu_read_unlock();
4572                 return;
4573         }
4574
4575         ieee80211_tpt_led_trig_rx(local,
4576                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4577                         skb->len);
4578
4579         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4580
4581         rcu_read_unlock();
4582
4583         return;
4584  drop:
4585         kfree_skb(skb);
4586 }
4587 EXPORT_SYMBOL(ieee80211_rx_napi);
4588
4589 /* This is a version of the rx handler that can be called from hard irq
4590  * context. Post the skb on the queue and schedule the tasklet */
4591 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4592 {
4593         struct ieee80211_local *local = hw_to_local(hw);
4594
4595         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4596
4597         skb->pkt_type = IEEE80211_RX_MSG;
4598         skb_queue_tail(&local->skb_queue, skb);
4599         tasklet_schedule(&local->tasklet);
4600 }
4601 EXPORT_SYMBOL(ieee80211_rx_irqsafe);