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_qos_nullfunc(hdr->frame_control) ||
1407             is_multicast_ether_addr(hdr->addr1))
1408                 return RX_CONTINUE;
1409
1410         if (!rx->sta)
1411                 return RX_CONTINUE;
1412
1413         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1414                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1415                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1416                 rx->sta->rx_stats.num_duplicates++;
1417                 return RX_DROP_UNUSABLE;
1418         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1419                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1420         }
1421
1422         return RX_CONTINUE;
1423 }
1424
1425 static ieee80211_rx_result debug_noinline
1426 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1427 {
1428         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1429
1430         /* Drop disallowed frame classes based on STA auth/assoc state;
1431          * IEEE 802.11, Chap 5.5.
1432          *
1433          * mac80211 filters only based on association state, i.e. it drops
1434          * Class 3 frames from not associated stations. hostapd sends
1435          * deauth/disassoc frames when needed. In addition, hostapd is
1436          * responsible for filtering on both auth and assoc states.
1437          */
1438
1439         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1440                 return ieee80211_rx_mesh_check(rx);
1441
1442         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1443                       ieee80211_is_pspoll(hdr->frame_control)) &&
1444                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1445                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1446                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1447                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1448                 /*
1449                  * accept port control frames from the AP even when it's not
1450                  * yet marked ASSOC to prevent a race where we don't set the
1451                  * assoc bit quickly enough before it sends the first frame
1452                  */
1453                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1454                     ieee80211_is_data_present(hdr->frame_control)) {
1455                         unsigned int hdrlen;
1456                         __be16 ethertype;
1457
1458                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1459
1460                         if (rx->skb->len < hdrlen + 8)
1461                                 return RX_DROP_MONITOR;
1462
1463                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1464                         if (ethertype == rx->sdata->control_port_protocol)
1465                                 return RX_CONTINUE;
1466                 }
1467
1468                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1469                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1470                                                hdr->addr2,
1471                                                GFP_ATOMIC))
1472                         return RX_DROP_UNUSABLE;
1473
1474                 return RX_DROP_MONITOR;
1475         }
1476
1477         return RX_CONTINUE;
1478 }
1479
1480
1481 static ieee80211_rx_result debug_noinline
1482 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1483 {
1484         struct ieee80211_local *local;
1485         struct ieee80211_hdr *hdr;
1486         struct sk_buff *skb;
1487
1488         local = rx->local;
1489         skb = rx->skb;
1490         hdr = (struct ieee80211_hdr *) skb->data;
1491
1492         if (!local->pspolling)
1493                 return RX_CONTINUE;
1494
1495         if (!ieee80211_has_fromds(hdr->frame_control))
1496                 /* this is not from AP */
1497                 return RX_CONTINUE;
1498
1499         if (!ieee80211_is_data(hdr->frame_control))
1500                 return RX_CONTINUE;
1501
1502         if (!ieee80211_has_moredata(hdr->frame_control)) {
1503                 /* AP has no more frames buffered for us */
1504                 local->pspolling = false;
1505                 return RX_CONTINUE;
1506         }
1507
1508         /* more data bit is set, let's request a new frame from the AP */
1509         ieee80211_send_pspoll(local, rx->sdata);
1510
1511         return RX_CONTINUE;
1512 }
1513
1514 static void sta_ps_start(struct sta_info *sta)
1515 {
1516         struct ieee80211_sub_if_data *sdata = sta->sdata;
1517         struct ieee80211_local *local = sdata->local;
1518         struct ps_data *ps;
1519         int tid;
1520
1521         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1522             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1523                 ps = &sdata->bss->ps;
1524         else
1525                 return;
1526
1527         atomic_inc(&ps->num_sta_ps);
1528         set_sta_flag(sta, WLAN_STA_PS_STA);
1529         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1530                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1531         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1532                sta->sta.addr, sta->sta.aid);
1533
1534         ieee80211_clear_fast_xmit(sta);
1535
1536         if (!sta->sta.txq[0])
1537                 return;
1538
1539         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1540                 if (txq_has_queue(sta->sta.txq[tid]))
1541                         set_bit(tid, &sta->txq_buffered_tids);
1542                 else
1543                         clear_bit(tid, &sta->txq_buffered_tids);
1544         }
1545 }
1546
1547 static void sta_ps_end(struct sta_info *sta)
1548 {
1549         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1550                sta->sta.addr, sta->sta.aid);
1551
1552         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1553                 /*
1554                  * Clear the flag only if the other one is still set
1555                  * so that the TX path won't start TX'ing new frames
1556                  * directly ... In the case that the driver flag isn't
1557                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1558                  */
1559                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1560                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1561                        sta->sta.addr, sta->sta.aid);
1562                 return;
1563         }
1564
1565         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1566         clear_sta_flag(sta, WLAN_STA_PS_STA);
1567         ieee80211_sta_ps_deliver_wakeup(sta);
1568 }
1569
1570 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1571 {
1572         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1573         bool in_ps;
1574
1575         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1576
1577         /* Don't let the same PS state be set twice */
1578         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1579         if ((start && in_ps) || (!start && !in_ps))
1580                 return -EINVAL;
1581
1582         if (start)
1583                 sta_ps_start(sta);
1584         else
1585                 sta_ps_end(sta);
1586
1587         return 0;
1588 }
1589 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1590
1591 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1592 {
1593         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1594
1595         if (test_sta_flag(sta, WLAN_STA_SP))
1596                 return;
1597
1598         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1599                 ieee80211_sta_ps_deliver_poll_response(sta);
1600         else
1601                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1602 }
1603 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1604
1605 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1606 {
1607         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1608         int ac = ieee80211_ac_from_tid(tid);
1609
1610         /*
1611          * If this AC is not trigger-enabled do nothing unless the
1612          * driver is calling us after it already checked.
1613          *
1614          * NB: This could/should check a separate bitmap of trigger-
1615          * enabled queues, but for now we only implement uAPSD w/o
1616          * TSPEC changes to the ACs, so they're always the same.
1617          */
1618         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1619             tid != IEEE80211_NUM_TIDS)
1620                 return;
1621
1622         /* if we are in a service period, do nothing */
1623         if (test_sta_flag(sta, WLAN_STA_SP))
1624                 return;
1625
1626         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1627                 ieee80211_sta_ps_deliver_uapsd(sta);
1628         else
1629                 set_sta_flag(sta, WLAN_STA_UAPSD);
1630 }
1631 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1632
1633 static ieee80211_rx_result debug_noinline
1634 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1635 {
1636         struct ieee80211_sub_if_data *sdata = rx->sdata;
1637         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1638         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1639
1640         if (!rx->sta)
1641                 return RX_CONTINUE;
1642
1643         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1644             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1645                 return RX_CONTINUE;
1646
1647         /*
1648          * The device handles station powersave, so don't do anything about
1649          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1650          * it to mac80211 since they're handled.)
1651          */
1652         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1653                 return RX_CONTINUE;
1654
1655         /*
1656          * Don't do anything if the station isn't already asleep. In
1657          * the uAPSD case, the station will probably be marked asleep,
1658          * in the PS-Poll case the station must be confused ...
1659          */
1660         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1661                 return RX_CONTINUE;
1662
1663         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1664                 ieee80211_sta_pspoll(&rx->sta->sta);
1665
1666                 /* Free PS Poll skb here instead of returning RX_DROP that would
1667                  * count as an dropped frame. */
1668                 dev_kfree_skb(rx->skb);
1669
1670                 return RX_QUEUED;
1671         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1672                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1673                    ieee80211_has_pm(hdr->frame_control) &&
1674                    (ieee80211_is_data_qos(hdr->frame_control) ||
1675                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1676                 u8 tid = ieee80211_get_tid(hdr);
1677
1678                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1679         }
1680
1681         return RX_CONTINUE;
1682 }
1683
1684 static ieee80211_rx_result debug_noinline
1685 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1686 {
1687         struct sta_info *sta = rx->sta;
1688         struct sk_buff *skb = rx->skb;
1689         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1690         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1691         int i;
1692
1693         if (!sta)
1694                 return RX_CONTINUE;
1695
1696         /*
1697          * Update last_rx only for IBSS packets which are for the current
1698          * BSSID and for station already AUTHORIZED to avoid keeping the
1699          * current IBSS network alive in cases where other STAs start
1700          * using different BSSID. This will also give the station another
1701          * chance to restart the authentication/authorization in case
1702          * something went wrong the first time.
1703          */
1704         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1705                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1706                                                 NL80211_IFTYPE_ADHOC);
1707                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1708                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1709                         sta->rx_stats.last_rx = jiffies;
1710                         if (ieee80211_is_data(hdr->frame_control) &&
1711                             !is_multicast_ether_addr(hdr->addr1))
1712                                 sta->rx_stats.last_rate =
1713                                         sta_stats_encode_rate(status);
1714                 }
1715         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1716                 sta->rx_stats.last_rx = jiffies;
1717         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1718                 /*
1719                  * Mesh beacons will update last_rx when if they are found to
1720                  * match the current local configuration when processed.
1721                  */
1722                 sta->rx_stats.last_rx = jiffies;
1723                 if (ieee80211_is_data(hdr->frame_control))
1724                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1725         }
1726
1727         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1728                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1729
1730         sta->rx_stats.fragments++;
1731
1732         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1733         sta->rx_stats.bytes += rx->skb->len;
1734         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1735
1736         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1737                 sta->rx_stats.last_signal = status->signal;
1738                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1739         }
1740
1741         if (status->chains) {
1742                 sta->rx_stats.chains = status->chains;
1743                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1744                         int signal = status->chain_signal[i];
1745
1746                         if (!(status->chains & BIT(i)))
1747                                 continue;
1748
1749                         sta->rx_stats.chain_signal_last[i] = signal;
1750                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1751                                         -signal);
1752                 }
1753         }
1754
1755         /*
1756          * Change STA power saving mode only at the end of a frame
1757          * exchange sequence, and only for a data or management
1758          * frame as specified in IEEE 802.11-2016 11.2.3.2
1759          */
1760         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1761             !ieee80211_has_morefrags(hdr->frame_control) &&
1762             !is_multicast_ether_addr(hdr->addr1) &&
1763             (ieee80211_is_mgmt(hdr->frame_control) ||
1764              ieee80211_is_data(hdr->frame_control)) &&
1765             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1766             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1767              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1768                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1769                         if (!ieee80211_has_pm(hdr->frame_control))
1770                                 sta_ps_end(sta);
1771                 } else {
1772                         if (ieee80211_has_pm(hdr->frame_control))
1773                                 sta_ps_start(sta);
1774                 }
1775         }
1776
1777         /* mesh power save support */
1778         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1779                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1780
1781         /*
1782          * Drop (qos-)data::nullfunc frames silently, since they
1783          * are used only to control station power saving mode.
1784          */
1785         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1786             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1787                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1788
1789                 /*
1790                  * If we receive a 4-addr nullfunc frame from a STA
1791                  * that was not moved to a 4-addr STA vlan yet send
1792                  * the event to userspace and for older hostapd drop
1793                  * the frame to the monitor interface.
1794                  */
1795                 if (ieee80211_has_a4(hdr->frame_control) &&
1796                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1797                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1798                       !rx->sdata->u.vlan.sta))) {
1799                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1800                                 cfg80211_rx_unexpected_4addr_frame(
1801                                         rx->sdata->dev, sta->sta.addr,
1802                                         GFP_ATOMIC);
1803                         return RX_DROP_MONITOR;
1804                 }
1805                 /*
1806                  * Update counter and free packet here to avoid
1807                  * counting this as a dropped packed.
1808                  */
1809                 sta->rx_stats.packets++;
1810                 dev_kfree_skb(rx->skb);
1811                 return RX_QUEUED;
1812         }
1813
1814         return RX_CONTINUE;
1815 } /* ieee80211_rx_h_sta_process */
1816
1817 static ieee80211_rx_result debug_noinline
1818 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1819 {
1820         struct sk_buff *skb = rx->skb;
1821         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1822         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1823         int keyidx;
1824         int hdrlen;
1825         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1826         struct ieee80211_key *sta_ptk = NULL;
1827         int mmie_keyidx = -1;
1828         __le16 fc;
1829         const struct ieee80211_cipher_scheme *cs = NULL;
1830
1831         /*
1832          * Key selection 101
1833          *
1834          * There are four types of keys:
1835          *  - GTK (group keys)
1836          *  - IGTK (group keys for management frames)
1837          *  - PTK (pairwise keys)
1838          *  - STK (station-to-station pairwise keys)
1839          *
1840          * When selecting a key, we have to distinguish between multicast
1841          * (including broadcast) and unicast frames, the latter can only
1842          * use PTKs and STKs while the former always use GTKs and IGTKs.
1843          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1844          * unicast frames can also use key indices like GTKs. Hence, if we
1845          * don't have a PTK/STK we check the key index for a WEP key.
1846          *
1847          * Note that in a regular BSS, multicast frames are sent by the
1848          * AP only, associated stations unicast the frame to the AP first
1849          * which then multicasts it on their behalf.
1850          *
1851          * There is also a slight problem in IBSS mode: GTKs are negotiated
1852          * with each station, that is something we don't currently handle.
1853          * The spec seems to expect that one negotiates the same key with
1854          * every station but there's no such requirement; VLANs could be
1855          * possible.
1856          */
1857
1858         /* start without a key */
1859         rx->key = NULL;
1860         fc = hdr->frame_control;
1861
1862         if (rx->sta) {
1863                 int keyid = rx->sta->ptk_idx;
1864
1865                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1866                         cs = rx->sta->cipher_scheme;
1867                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1868                         if (unlikely(keyid < 0))
1869                                 return RX_DROP_UNUSABLE;
1870                 }
1871                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1872         }
1873
1874         if (!ieee80211_has_protected(fc))
1875                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1876
1877         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1878                 rx->key = sta_ptk;
1879                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1880                     (status->flag & RX_FLAG_IV_STRIPPED))
1881                         return RX_CONTINUE;
1882                 /* Skip decryption if the frame is not protected. */
1883                 if (!ieee80211_has_protected(fc))
1884                         return RX_CONTINUE;
1885         } else if (mmie_keyidx >= 0) {
1886                 /* Broadcast/multicast robust management frame / BIP */
1887                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1888                     (status->flag & RX_FLAG_IV_STRIPPED))
1889                         return RX_CONTINUE;
1890
1891                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1892                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1893                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1894                 if (rx->sta) {
1895                         if (ieee80211_is_group_privacy_action(skb) &&
1896                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1897                                 return RX_DROP_MONITOR;
1898
1899                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1900                 }
1901                 if (!rx->key)
1902                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1903         } else if (!ieee80211_has_protected(fc)) {
1904                 /*
1905                  * The frame was not protected, so skip decryption. However, we
1906                  * need to set rx->key if there is a key that could have been
1907                  * used so that the frame may be dropped if encryption would
1908                  * have been expected.
1909                  */
1910                 struct ieee80211_key *key = NULL;
1911                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1912                 int i;
1913
1914                 if (ieee80211_is_mgmt(fc) &&
1915                     is_multicast_ether_addr(hdr->addr1) &&
1916                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1917                         rx->key = key;
1918                 else {
1919                         if (rx->sta) {
1920                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1921                                         key = rcu_dereference(rx->sta->gtk[i]);
1922                                         if (key)
1923                                                 break;
1924                                 }
1925                         }
1926                         if (!key) {
1927                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1928                                         key = rcu_dereference(sdata->keys[i]);
1929                                         if (key)
1930                                                 break;
1931                                 }
1932                         }
1933                         if (key)
1934                                 rx->key = key;
1935                 }
1936                 return RX_CONTINUE;
1937         } else {
1938                 u8 keyid;
1939
1940                 /*
1941                  * The device doesn't give us the IV so we won't be
1942                  * able to look up the key. That's ok though, we
1943                  * don't need to decrypt the frame, we just won't
1944                  * be able to keep statistics accurate.
1945                  * Except for key threshold notifications, should
1946                  * we somehow allow the driver to tell us which key
1947                  * the hardware used if this flag is set?
1948                  */
1949                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1950                     (status->flag & RX_FLAG_IV_STRIPPED))
1951                         return RX_CONTINUE;
1952
1953                 hdrlen = ieee80211_hdrlen(fc);
1954
1955                 if (cs) {
1956                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1957
1958                         if (unlikely(keyidx < 0))
1959                                 return RX_DROP_UNUSABLE;
1960                 } else {
1961                         if (rx->skb->len < 8 + hdrlen)
1962                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1963                         /*
1964                          * no need to call ieee80211_wep_get_keyidx,
1965                          * it verifies a bunch of things we've done already
1966                          */
1967                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1968                         keyidx = keyid >> 6;
1969                 }
1970
1971                 /* check per-station GTK first, if multicast packet */
1972                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1973                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1974
1975                 /* if not found, try default key */
1976                 if (!rx->key) {
1977                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1978
1979                         /*
1980                          * RSNA-protected unicast frames should always be
1981                          * sent with pairwise or station-to-station keys,
1982                          * but for WEP we allow using a key index as well.
1983                          */
1984                         if (rx->key &&
1985                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1986                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1987                             !is_multicast_ether_addr(hdr->addr1))
1988                                 rx->key = NULL;
1989                 }
1990         }
1991
1992         if (rx->key) {
1993                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1994                         return RX_DROP_MONITOR;
1995
1996                 /* TODO: add threshold stuff again */
1997         } else {
1998                 return RX_DROP_MONITOR;
1999         }
2000
2001         switch (rx->key->conf.cipher) {
2002         case WLAN_CIPHER_SUITE_WEP40:
2003         case WLAN_CIPHER_SUITE_WEP104:
2004                 result = ieee80211_crypto_wep_decrypt(rx);
2005                 break;
2006         case WLAN_CIPHER_SUITE_TKIP:
2007                 result = ieee80211_crypto_tkip_decrypt(rx);
2008                 break;
2009         case WLAN_CIPHER_SUITE_CCMP:
2010                 result = ieee80211_crypto_ccmp_decrypt(
2011                         rx, IEEE80211_CCMP_MIC_LEN);
2012                 break;
2013         case WLAN_CIPHER_SUITE_CCMP_256:
2014                 result = ieee80211_crypto_ccmp_decrypt(
2015                         rx, IEEE80211_CCMP_256_MIC_LEN);
2016                 break;
2017         case WLAN_CIPHER_SUITE_AES_CMAC:
2018                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2019                 break;
2020         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2021                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2022                 break;
2023         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2024         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2025                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2026                 break;
2027         case WLAN_CIPHER_SUITE_GCMP:
2028         case WLAN_CIPHER_SUITE_GCMP_256:
2029                 result = ieee80211_crypto_gcmp_decrypt(rx);
2030                 break;
2031         default:
2032                 result = ieee80211_crypto_hw_decrypt(rx);
2033         }
2034
2035         /* the hdr variable is invalid after the decrypt handlers */
2036
2037         /* either the frame has been decrypted or will be dropped */
2038         status->flag |= RX_FLAG_DECRYPTED;
2039
2040         return result;
2041 }
2042
2043 static inline struct ieee80211_fragment_entry *
2044 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2045                          unsigned int frag, unsigned int seq, int rx_queue,
2046                          struct sk_buff **skb)
2047 {
2048         struct ieee80211_fragment_entry *entry;
2049
2050         entry = &sdata->fragments[sdata->fragment_next++];
2051         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2052                 sdata->fragment_next = 0;
2053
2054         if (!skb_queue_empty(&entry->skb_list))
2055                 __skb_queue_purge(&entry->skb_list);
2056
2057         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2058         *skb = NULL;
2059         entry->first_frag_time = jiffies;
2060         entry->seq = seq;
2061         entry->rx_queue = rx_queue;
2062         entry->last_frag = frag;
2063         entry->check_sequential_pn = false;
2064         entry->extra_len = 0;
2065
2066         return entry;
2067 }
2068
2069 static inline struct ieee80211_fragment_entry *
2070 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2071                           unsigned int frag, unsigned int seq,
2072                           int rx_queue, struct ieee80211_hdr *hdr)
2073 {
2074         struct ieee80211_fragment_entry *entry;
2075         int i, idx;
2076
2077         idx = sdata->fragment_next;
2078         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2079                 struct ieee80211_hdr *f_hdr;
2080                 struct sk_buff *f_skb;
2081
2082                 idx--;
2083                 if (idx < 0)
2084                         idx = IEEE80211_FRAGMENT_MAX - 1;
2085
2086                 entry = &sdata->fragments[idx];
2087                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2088                     entry->rx_queue != rx_queue ||
2089                     entry->last_frag + 1 != frag)
2090                         continue;
2091
2092                 f_skb = __skb_peek(&entry->skb_list);
2093                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2094
2095                 /*
2096                  * Check ftype and addresses are equal, else check next fragment
2097                  */
2098                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2099                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2100                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2101                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2102                         continue;
2103
2104                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2105                         __skb_queue_purge(&entry->skb_list);
2106                         continue;
2107                 }
2108                 return entry;
2109         }
2110
2111         return NULL;
2112 }
2113
2114 static ieee80211_rx_result debug_noinline
2115 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2116 {
2117         struct ieee80211_hdr *hdr;
2118         u16 sc;
2119         __le16 fc;
2120         unsigned int frag, seq;
2121         struct ieee80211_fragment_entry *entry;
2122         struct sk_buff *skb;
2123
2124         hdr = (struct ieee80211_hdr *)rx->skb->data;
2125         fc = hdr->frame_control;
2126
2127         if (ieee80211_is_ctl(fc))
2128                 return RX_CONTINUE;
2129
2130         sc = le16_to_cpu(hdr->seq_ctrl);
2131         frag = sc & IEEE80211_SCTL_FRAG;
2132
2133         if (is_multicast_ether_addr(hdr->addr1)) {
2134                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2135                 goto out_no_led;
2136         }
2137
2138         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2139                 goto out;
2140
2141         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2142
2143         if (skb_linearize(rx->skb))
2144                 return RX_DROP_UNUSABLE;
2145
2146         /*
2147          *  skb_linearize() might change the skb->data and
2148          *  previously cached variables (in this case, hdr) need to
2149          *  be refreshed with the new data.
2150          */
2151         hdr = (struct ieee80211_hdr *)rx->skb->data;
2152         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2153
2154         if (frag == 0) {
2155                 /* This is the first fragment of a new frame. */
2156                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2157                                                  rx->seqno_idx, &(rx->skb));
2158                 if (rx->key &&
2159                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2160                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2161                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2162                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2163                     ieee80211_has_protected(fc)) {
2164                         int queue = rx->security_idx;
2165
2166                         /* Store CCMP/GCMP PN so that we can verify that the
2167                          * next fragment has a sequential PN value.
2168                          */
2169                         entry->check_sequential_pn = true;
2170                         memcpy(entry->last_pn,
2171                                rx->key->u.ccmp.rx_pn[queue],
2172                                IEEE80211_CCMP_PN_LEN);
2173                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2174                                               u.ccmp.rx_pn) !=
2175                                      offsetof(struct ieee80211_key,
2176                                               u.gcmp.rx_pn));
2177                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2178                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2179                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2180                                      IEEE80211_GCMP_PN_LEN);
2181                 }
2182                 return RX_QUEUED;
2183         }
2184
2185         /* This is a fragment for a frame that should already be pending in
2186          * fragment cache. Add this fragment to the end of the pending entry.
2187          */
2188         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2189                                           rx->seqno_idx, hdr);
2190         if (!entry) {
2191                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2192                 return RX_DROP_MONITOR;
2193         }
2194
2195         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2196          *  MPDU PN values are not incrementing in steps of 1."
2197          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2198          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2199          */
2200         if (entry->check_sequential_pn) {
2201                 int i;
2202                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2203                 int queue;
2204
2205                 if (!rx->key ||
2206                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2207                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2208                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2209                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2210                         return RX_DROP_UNUSABLE;
2211                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2212                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2213                         pn[i]++;
2214                         if (pn[i])
2215                                 break;
2216                 }
2217                 queue = rx->security_idx;
2218                 rpn = rx->key->u.ccmp.rx_pn[queue];
2219                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2220                         return RX_DROP_UNUSABLE;
2221                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2222         }
2223
2224         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2225         __skb_queue_tail(&entry->skb_list, rx->skb);
2226         entry->last_frag = frag;
2227         entry->extra_len += rx->skb->len;
2228         if (ieee80211_has_morefrags(fc)) {
2229                 rx->skb = NULL;
2230                 return RX_QUEUED;
2231         }
2232
2233         rx->skb = __skb_dequeue(&entry->skb_list);
2234         if (skb_tailroom(rx->skb) < entry->extra_len) {
2235                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2236                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2237                                               GFP_ATOMIC))) {
2238                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2239                         __skb_queue_purge(&entry->skb_list);
2240                         return RX_DROP_UNUSABLE;
2241                 }
2242         }
2243         while ((skb = __skb_dequeue(&entry->skb_list))) {
2244                 skb_put_data(rx->skb, skb->data, skb->len);
2245                 dev_kfree_skb(skb);
2246         }
2247
2248  out:
2249         ieee80211_led_rx(rx->local);
2250  out_no_led:
2251         if (rx->sta)
2252                 rx->sta->rx_stats.packets++;
2253         return RX_CONTINUE;
2254 }
2255
2256 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2257 {
2258         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2259                 return -EACCES;
2260
2261         return 0;
2262 }
2263
2264 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2265 {
2266         struct sk_buff *skb = rx->skb;
2267         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2268
2269         /*
2270          * Pass through unencrypted frames if the hardware has
2271          * decrypted them already.
2272          */
2273         if (status->flag & RX_FLAG_DECRYPTED)
2274                 return 0;
2275
2276         /* Drop unencrypted frames if key is set. */
2277         if (unlikely(!ieee80211_has_protected(fc) &&
2278                      !ieee80211_is_nullfunc(fc) &&
2279                      ieee80211_is_data(fc) && rx->key))
2280                 return -EACCES;
2281
2282         return 0;
2283 }
2284
2285 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2286 {
2287         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2288         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2289         __le16 fc = hdr->frame_control;
2290
2291         /*
2292          * Pass through unencrypted frames if the hardware has
2293          * decrypted them already.
2294          */
2295         if (status->flag & RX_FLAG_DECRYPTED)
2296                 return 0;
2297
2298         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2299                 if (unlikely(!ieee80211_has_protected(fc) &&
2300                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2301                              rx->key)) {
2302                         if (ieee80211_is_deauth(fc) ||
2303                             ieee80211_is_disassoc(fc))
2304                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2305                                                              rx->skb->data,
2306                                                              rx->skb->len);
2307                         return -EACCES;
2308                 }
2309                 /* BIP does not use Protected field, so need to check MMIE */
2310                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2311                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2312                         if (ieee80211_is_deauth(fc) ||
2313                             ieee80211_is_disassoc(fc))
2314                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2315                                                              rx->skb->data,
2316                                                              rx->skb->len);
2317                         return -EACCES;
2318                 }
2319                 /*
2320                  * When using MFP, Action frames are not allowed prior to
2321                  * having configured keys.
2322                  */
2323                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2324                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2325                         return -EACCES;
2326         }
2327
2328         return 0;
2329 }
2330
2331 static int
2332 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2333 {
2334         struct ieee80211_sub_if_data *sdata = rx->sdata;
2335         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2336         bool check_port_control = false;
2337         struct ethhdr *ehdr;
2338         int ret;
2339
2340         *port_control = false;
2341         if (ieee80211_has_a4(hdr->frame_control) &&
2342             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2343                 return -1;
2344
2345         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2346             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2347
2348                 if (!sdata->u.mgd.use_4addr)
2349                         return -1;
2350                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2351                         check_port_control = true;
2352         }
2353
2354         if (is_multicast_ether_addr(hdr->addr1) &&
2355             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2356                 return -1;
2357
2358         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2359         if (ret < 0)
2360                 return ret;
2361
2362         ehdr = (struct ethhdr *) rx->skb->data;
2363         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2364                 *port_control = true;
2365         else if (check_port_control)
2366                 return -1;
2367
2368         return 0;
2369 }
2370
2371 /*
2372  * requires that rx->skb is a frame with ethernet header
2373  */
2374 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2375 {
2376         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2377                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2378         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2379
2380         /*
2381          * Allow EAPOL frames to us/the PAE group address regardless
2382          * of whether the frame was encrypted or not.
2383          */
2384         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2385             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2386              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2387                 return true;
2388
2389         if (ieee80211_802_1x_port_control(rx) ||
2390             ieee80211_drop_unencrypted(rx, fc))
2391                 return false;
2392
2393         return true;
2394 }
2395
2396 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2397                                                  struct ieee80211_rx_data *rx)
2398 {
2399         struct ieee80211_sub_if_data *sdata = rx->sdata;
2400         struct net_device *dev = sdata->dev;
2401
2402         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2403                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2404                      sdata->control_port_over_nl80211)) {
2405                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2406                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2407
2408                 cfg80211_rx_control_port(dev, skb, noencrypt);
2409                 dev_kfree_skb(skb);
2410         } else {
2411                 /* deliver to local stack */
2412                 if (rx->napi)
2413                         napi_gro_receive(rx->napi, skb);
2414                 else
2415                         netif_receive_skb(skb);
2416         }
2417 }
2418
2419 /*
2420  * requires that rx->skb is a frame with ethernet header
2421  */
2422 static void
2423 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2424 {
2425         struct ieee80211_sub_if_data *sdata = rx->sdata;
2426         struct net_device *dev = sdata->dev;
2427         struct sk_buff *skb, *xmit_skb;
2428         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2429         struct sta_info *dsta;
2430
2431         skb = rx->skb;
2432         xmit_skb = NULL;
2433
2434         ieee80211_rx_stats(dev, skb->len);
2435
2436         if (rx->sta) {
2437                 /* The seqno index has the same property as needed
2438                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2439                  * for non-QoS-data frames. Here we know it's a data
2440                  * frame, so count MSDUs.
2441                  */
2442                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2443                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2444                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2445         }
2446
2447         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2448              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2449             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2450             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2451                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2452                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2453                         /*
2454                          * send multicast frames both to higher layers in
2455                          * local net stack and back to the wireless medium
2456                          */
2457                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2458                         if (!xmit_skb)
2459                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2460                                                     dev->name);
2461                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2462                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2463                         dsta = sta_info_get(sdata, ehdr->h_dest);
2464                         if (dsta) {
2465                                 /*
2466                                  * The destination station is associated to
2467                                  * this AP (in this VLAN), so send the frame
2468                                  * directly to it and do not pass it to local
2469                                  * net stack.
2470                                  */
2471                                 xmit_skb = skb;
2472                                 skb = NULL;
2473                         }
2474                 }
2475         }
2476
2477 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2478         if (skb) {
2479                 /* 'align' will only take the values 0 or 2 here since all
2480                  * frames are required to be aligned to 2-byte boundaries
2481                  * when being passed to mac80211; the code here works just
2482                  * as well if that isn't true, but mac80211 assumes it can
2483                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2484                  */
2485                 int align;
2486
2487                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2488                 if (align) {
2489                         if (WARN_ON(skb_headroom(skb) < 3)) {
2490                                 dev_kfree_skb(skb);
2491                                 skb = NULL;
2492                         } else {
2493                                 u8 *data = skb->data;
2494                                 size_t len = skb_headlen(skb);
2495                                 skb->data -= align;
2496                                 memmove(skb->data, data, len);
2497                                 skb_set_tail_pointer(skb, len);
2498                         }
2499                 }
2500         }
2501 #endif
2502
2503         if (skb) {
2504                 skb->protocol = eth_type_trans(skb, dev);
2505                 memset(skb->cb, 0, sizeof(skb->cb));
2506
2507                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2508         }
2509
2510         if (xmit_skb) {
2511                 /*
2512                  * Send to wireless media and increase priority by 256 to
2513                  * keep the received priority instead of reclassifying
2514                  * the frame (see cfg80211_classify8021d).
2515                  */
2516                 xmit_skb->priority += 256;
2517                 xmit_skb->protocol = htons(ETH_P_802_3);
2518                 skb_reset_network_header(xmit_skb);
2519                 skb_reset_mac_header(xmit_skb);
2520                 dev_queue_xmit(xmit_skb);
2521         }
2522 }
2523
2524 static ieee80211_rx_result debug_noinline
2525 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2526 {
2527         struct net_device *dev = rx->sdata->dev;
2528         struct sk_buff *skb = rx->skb;
2529         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2530         __le16 fc = hdr->frame_control;
2531         struct sk_buff_head frame_list;
2532         struct ethhdr ethhdr;
2533         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2534
2535         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2536                 check_da = NULL;
2537                 check_sa = NULL;
2538         } else switch (rx->sdata->vif.type) {
2539                 case NL80211_IFTYPE_AP:
2540                 case NL80211_IFTYPE_AP_VLAN:
2541                         check_da = NULL;
2542                         break;
2543                 case NL80211_IFTYPE_STATION:
2544                         if (!rx->sta ||
2545                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2546                                 check_sa = NULL;
2547                         break;
2548                 case NL80211_IFTYPE_MESH_POINT:
2549                         check_sa = NULL;
2550                         break;
2551                 default:
2552                         break;
2553         }
2554
2555         skb->dev = dev;
2556         __skb_queue_head_init(&frame_list);
2557
2558         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2559                                           rx->sdata->vif.addr,
2560                                           rx->sdata->vif.type,
2561                                           data_offset))
2562                 return RX_DROP_UNUSABLE;
2563
2564         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2565                                  rx->sdata->vif.type,
2566                                  rx->local->hw.extra_tx_headroom,
2567                                  check_da, check_sa);
2568
2569         while (!skb_queue_empty(&frame_list)) {
2570                 rx->skb = __skb_dequeue(&frame_list);
2571
2572                 if (!ieee80211_frame_allowed(rx, fc)) {
2573                         dev_kfree_skb(rx->skb);
2574                         continue;
2575                 }
2576
2577                 ieee80211_deliver_skb(rx);
2578         }
2579
2580         return RX_QUEUED;
2581 }
2582
2583 static ieee80211_rx_result debug_noinline
2584 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2585 {
2586         struct sk_buff *skb = rx->skb;
2587         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2588         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2589         __le16 fc = hdr->frame_control;
2590
2591         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2592                 return RX_CONTINUE;
2593
2594         if (unlikely(!ieee80211_is_data(fc)))
2595                 return RX_CONTINUE;
2596
2597         if (unlikely(!ieee80211_is_data_present(fc)))
2598                 return RX_DROP_MONITOR;
2599
2600         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2601                 switch (rx->sdata->vif.type) {
2602                 case NL80211_IFTYPE_AP_VLAN:
2603                         if (!rx->sdata->u.vlan.sta)
2604                                 return RX_DROP_UNUSABLE;
2605                         break;
2606                 case NL80211_IFTYPE_STATION:
2607                         if (!rx->sdata->u.mgd.use_4addr)
2608                                 return RX_DROP_UNUSABLE;
2609                         break;
2610                 default:
2611                         return RX_DROP_UNUSABLE;
2612                 }
2613         }
2614
2615         if (is_multicast_ether_addr(hdr->addr1))
2616                 return RX_DROP_UNUSABLE;
2617
2618         return __ieee80211_rx_h_amsdu(rx, 0);
2619 }
2620
2621 #ifdef CONFIG_MAC80211_MESH
2622 static ieee80211_rx_result
2623 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2624 {
2625         struct ieee80211_hdr *fwd_hdr, *hdr;
2626         struct ieee80211_tx_info *info;
2627         struct ieee80211s_hdr *mesh_hdr;
2628         struct sk_buff *skb = rx->skb, *fwd_skb;
2629         struct ieee80211_local *local = rx->local;
2630         struct ieee80211_sub_if_data *sdata = rx->sdata;
2631         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2632         u16 ac, q, hdrlen;
2633
2634         hdr = (struct ieee80211_hdr *) skb->data;
2635         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2636
2637         /* make sure fixed part of mesh header is there, also checks skb len */
2638         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2639                 return RX_DROP_MONITOR;
2640
2641         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2642
2643         /* make sure full mesh header is there, also checks skb len */
2644         if (!pskb_may_pull(rx->skb,
2645                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2646                 return RX_DROP_MONITOR;
2647
2648         /* reload pointers */
2649         hdr = (struct ieee80211_hdr *) skb->data;
2650         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2651
2652         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2653                 return RX_DROP_MONITOR;
2654
2655         /* frame is in RMC, don't forward */
2656         if (ieee80211_is_data(hdr->frame_control) &&
2657             is_multicast_ether_addr(hdr->addr1) &&
2658             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2659                 return RX_DROP_MONITOR;
2660
2661         if (!ieee80211_is_data(hdr->frame_control))
2662                 return RX_CONTINUE;
2663
2664         if (!mesh_hdr->ttl)
2665                 return RX_DROP_MONITOR;
2666
2667         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2668                 struct mesh_path *mppath;
2669                 char *proxied_addr;
2670                 char *mpp_addr;
2671
2672                 if (is_multicast_ether_addr(hdr->addr1)) {
2673                         mpp_addr = hdr->addr3;
2674                         proxied_addr = mesh_hdr->eaddr1;
2675                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2676                             MESH_FLAGS_AE_A5_A6) {
2677                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2678                         mpp_addr = hdr->addr4;
2679                         proxied_addr = mesh_hdr->eaddr2;
2680                 } else {
2681                         return RX_DROP_MONITOR;
2682                 }
2683
2684                 rcu_read_lock();
2685                 mppath = mpp_path_lookup(sdata, proxied_addr);
2686                 if (!mppath) {
2687                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2688                 } else {
2689                         spin_lock_bh(&mppath->state_lock);
2690                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2691                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2692                         mppath->exp_time = jiffies;
2693                         spin_unlock_bh(&mppath->state_lock);
2694                 }
2695                 rcu_read_unlock();
2696         }
2697
2698         /* Frame has reached destination.  Don't forward */
2699         if (!is_multicast_ether_addr(hdr->addr1) &&
2700             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2701                 return RX_CONTINUE;
2702
2703         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2704         q = sdata->vif.hw_queue[ac];
2705         if (ieee80211_queue_stopped(&local->hw, q)) {
2706                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2707                 return RX_DROP_MONITOR;
2708         }
2709         skb_set_queue_mapping(skb, q);
2710
2711         if (!--mesh_hdr->ttl) {
2712                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2713                 goto out;
2714         }
2715
2716         if (!ifmsh->mshcfg.dot11MeshForwarding)
2717                 goto out;
2718
2719         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2720                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2721         if (!fwd_skb)
2722                 goto out;
2723
2724         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2725         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2726         info = IEEE80211_SKB_CB(fwd_skb);
2727         memset(info, 0, sizeof(*info));
2728         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2729         info->control.vif = &rx->sdata->vif;
2730         info->control.jiffies = jiffies;
2731         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2732                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2733                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2734                 /* update power mode indication when forwarding */
2735                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2736         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2737                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2738                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2739         } else {
2740                 /* unable to resolve next hop */
2741                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2742                                    fwd_hdr->addr3, 0,
2743                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2744                                    fwd_hdr->addr2);
2745                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2746                 kfree_skb(fwd_skb);
2747                 return RX_DROP_MONITOR;
2748         }
2749
2750         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2751         ieee80211_add_pending_skb(local, fwd_skb);
2752  out:
2753         if (is_multicast_ether_addr(hdr->addr1))
2754                 return RX_CONTINUE;
2755         return RX_DROP_MONITOR;
2756 }
2757 #endif
2758
2759 static ieee80211_rx_result debug_noinline
2760 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2761 {
2762         struct ieee80211_sub_if_data *sdata = rx->sdata;
2763         struct ieee80211_local *local = rx->local;
2764         struct net_device *dev = sdata->dev;
2765         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2766         __le16 fc = hdr->frame_control;
2767         bool port_control;
2768         int err;
2769
2770         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2771                 return RX_CONTINUE;
2772
2773         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2774                 return RX_DROP_MONITOR;
2775
2776         /*
2777          * Send unexpected-4addr-frame event to hostapd. For older versions,
2778          * also drop the frame to cooked monitor interfaces.
2779          */
2780         if (ieee80211_has_a4(hdr->frame_control) &&
2781             sdata->vif.type == NL80211_IFTYPE_AP) {
2782                 if (rx->sta &&
2783                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2784                         cfg80211_rx_unexpected_4addr_frame(
2785                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2786                 return RX_DROP_MONITOR;
2787         }
2788
2789         err = __ieee80211_data_to_8023(rx, &port_control);
2790         if (unlikely(err))
2791                 return RX_DROP_UNUSABLE;
2792
2793         if (!ieee80211_frame_allowed(rx, fc))
2794                 return RX_DROP_MONITOR;
2795
2796         /* directly handle TDLS channel switch requests/responses */
2797         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2798                                                 cpu_to_be16(ETH_P_TDLS))) {
2799                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2800
2801                 if (pskb_may_pull(rx->skb,
2802                                   offsetof(struct ieee80211_tdls_data, u)) &&
2803                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2804                     tf->category == WLAN_CATEGORY_TDLS &&
2805                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2806                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2807                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2808                         schedule_work(&local->tdls_chsw_work);
2809                         if (rx->sta)
2810                                 rx->sta->rx_stats.packets++;
2811
2812                         return RX_QUEUED;
2813                 }
2814         }
2815
2816         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2817             unlikely(port_control) && sdata->bss) {
2818                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2819                                      u.ap);
2820                 dev = sdata->dev;
2821                 rx->sdata = sdata;
2822         }
2823
2824         rx->skb->dev = dev;
2825
2826         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2827             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2828             !is_multicast_ether_addr(
2829                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2830             (!local->scanning &&
2831              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2832                 mod_timer(&local->dynamic_ps_timer, jiffies +
2833                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2834
2835         ieee80211_deliver_skb(rx);
2836
2837         return RX_QUEUED;
2838 }
2839
2840 static ieee80211_rx_result debug_noinline
2841 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2842 {
2843         struct sk_buff *skb = rx->skb;
2844         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2845         struct tid_ampdu_rx *tid_agg_rx;
2846         u16 start_seq_num;
2847         u16 tid;
2848
2849         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2850                 return RX_CONTINUE;
2851
2852         if (ieee80211_is_back_req(bar->frame_control)) {
2853                 struct {
2854                         __le16 control, start_seq_num;
2855                 } __packed bar_data;
2856                 struct ieee80211_event event = {
2857                         .type = BAR_RX_EVENT,
2858                 };
2859
2860                 if (!rx->sta)
2861                         return RX_DROP_MONITOR;
2862
2863                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2864                                   &bar_data, sizeof(bar_data)))
2865                         return RX_DROP_MONITOR;
2866
2867                 tid = le16_to_cpu(bar_data.control) >> 12;
2868
2869                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2870                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2871                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2872                                              WLAN_BACK_RECIPIENT,
2873                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2874
2875                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2876                 if (!tid_agg_rx)
2877                         return RX_DROP_MONITOR;
2878
2879                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2880                 event.u.ba.tid = tid;
2881                 event.u.ba.ssn = start_seq_num;
2882                 event.u.ba.sta = &rx->sta->sta;
2883
2884                 /* reset session timer */
2885                 if (tid_agg_rx->timeout)
2886                         mod_timer(&tid_agg_rx->session_timer,
2887                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2888
2889                 spin_lock(&tid_agg_rx->reorder_lock);
2890                 /* release stored frames up to start of BAR */
2891                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2892                                                  start_seq_num, frames);
2893                 spin_unlock(&tid_agg_rx->reorder_lock);
2894
2895                 drv_event_callback(rx->local, rx->sdata, &event);
2896
2897                 kfree_skb(skb);
2898                 return RX_QUEUED;
2899         }
2900
2901         /*
2902          * After this point, we only want management frames,
2903          * so we can drop all remaining control frames to
2904          * cooked monitor interfaces.
2905          */
2906         return RX_DROP_MONITOR;
2907 }
2908
2909 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2910                                            struct ieee80211_mgmt *mgmt,
2911                                            size_t len)
2912 {
2913         struct ieee80211_local *local = sdata->local;
2914         struct sk_buff *skb;
2915         struct ieee80211_mgmt *resp;
2916
2917         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2918                 /* Not to own unicast address */
2919                 return;
2920         }
2921
2922         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2923             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2924                 /* Not from the current AP or not associated yet. */
2925                 return;
2926         }
2927
2928         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2929                 /* Too short SA Query request frame */
2930                 return;
2931         }
2932
2933         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2934         if (skb == NULL)
2935                 return;
2936
2937         skb_reserve(skb, local->hw.extra_tx_headroom);
2938         resp = skb_put_zero(skb, 24);
2939         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2940         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2941         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2942         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2943                                           IEEE80211_STYPE_ACTION);
2944         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2945         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2946         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2947         memcpy(resp->u.action.u.sa_query.trans_id,
2948                mgmt->u.action.u.sa_query.trans_id,
2949                WLAN_SA_QUERY_TR_ID_LEN);
2950
2951         ieee80211_tx_skb(sdata, skb);
2952 }
2953
2954 static ieee80211_rx_result debug_noinline
2955 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2956 {
2957         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2958         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2959
2960         /*
2961          * From here on, look only at management frames.
2962          * Data and control frames are already handled,
2963          * and unknown (reserved) frames are useless.
2964          */
2965         if (rx->skb->len < 24)
2966                 return RX_DROP_MONITOR;
2967
2968         if (!ieee80211_is_mgmt(mgmt->frame_control))
2969                 return RX_DROP_MONITOR;
2970
2971         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2972             ieee80211_is_beacon(mgmt->frame_control) &&
2973             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2974                 int sig = 0;
2975
2976                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2977                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2978                         sig = status->signal;
2979
2980                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2981                                             rx->skb->data, rx->skb->len,
2982                                             status->freq, sig);
2983                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2984         }
2985
2986         if (ieee80211_drop_unencrypted_mgmt(rx))
2987                 return RX_DROP_UNUSABLE;
2988
2989         return RX_CONTINUE;
2990 }
2991
2992 static ieee80211_rx_result debug_noinline
2993 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2994 {
2995         struct ieee80211_local *local = rx->local;
2996         struct ieee80211_sub_if_data *sdata = rx->sdata;
2997         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2998         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2999         int len = rx->skb->len;
3000
3001         if (!ieee80211_is_action(mgmt->frame_control))
3002                 return RX_CONTINUE;
3003
3004         /* drop too small frames */
3005         if (len < IEEE80211_MIN_ACTION_SIZE)
3006                 return RX_DROP_UNUSABLE;
3007
3008         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3009             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3010             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3011                 return RX_DROP_UNUSABLE;
3012
3013         switch (mgmt->u.action.category) {
3014         case WLAN_CATEGORY_HT:
3015                 /* reject HT action frames from stations not supporting HT */
3016                 if (!rx->sta->sta.ht_cap.ht_supported)
3017                         goto invalid;
3018
3019                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3020                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3021                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3022                     sdata->vif.type != NL80211_IFTYPE_AP &&
3023                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3024                         break;
3025
3026                 /* verify action & smps_control/chanwidth are present */
3027                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3028                         goto invalid;
3029
3030                 switch (mgmt->u.action.u.ht_smps.action) {
3031                 case WLAN_HT_ACTION_SMPS: {
3032                         struct ieee80211_supported_band *sband;
3033                         enum ieee80211_smps_mode smps_mode;
3034                         struct sta_opmode_info sta_opmode = {};
3035
3036                         /* convert to HT capability */
3037                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3038                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3039                                 smps_mode = IEEE80211_SMPS_OFF;
3040                                 break;
3041                         case WLAN_HT_SMPS_CONTROL_STATIC:
3042                                 smps_mode = IEEE80211_SMPS_STATIC;
3043                                 break;
3044                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3045                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3046                                 break;
3047                         default:
3048                                 goto invalid;
3049                         }
3050
3051                         /* if no change do nothing */
3052                         if (rx->sta->sta.smps_mode == smps_mode)
3053                                 goto handled;
3054                         rx->sta->sta.smps_mode = smps_mode;
3055                         sta_opmode.smps_mode =
3056                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3057                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3058
3059                         sband = rx->local->hw.wiphy->bands[status->band];
3060
3061                         rate_control_rate_update(local, sband, rx->sta,
3062                                                  IEEE80211_RC_SMPS_CHANGED);
3063                         cfg80211_sta_opmode_change_notify(sdata->dev,
3064                                                           rx->sta->addr,
3065                                                           &sta_opmode,
3066                                                           GFP_KERNEL);
3067                         goto handled;
3068                 }
3069                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3070                         struct ieee80211_supported_band *sband;
3071                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3072                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3073                         struct sta_opmode_info sta_opmode = {};
3074
3075                         /* If it doesn't support 40 MHz it can't change ... */
3076                         if (!(rx->sta->sta.ht_cap.cap &
3077                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3078                                 goto handled;
3079
3080                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3081                                 max_bw = IEEE80211_STA_RX_BW_20;
3082                         else
3083                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3084
3085                         /* set cur_max_bandwidth and recalc sta bw */
3086                         rx->sta->cur_max_bandwidth = max_bw;
3087                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3088
3089                         if (rx->sta->sta.bandwidth == new_bw)
3090                                 goto handled;
3091
3092                         rx->sta->sta.bandwidth = new_bw;
3093                         sband = rx->local->hw.wiphy->bands[status->band];
3094                         sta_opmode.bw =
3095                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3096                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3097
3098                         rate_control_rate_update(local, sband, rx->sta,
3099                                                  IEEE80211_RC_BW_CHANGED);
3100                         cfg80211_sta_opmode_change_notify(sdata->dev,
3101                                                           rx->sta->addr,
3102                                                           &sta_opmode,
3103                                                           GFP_KERNEL);
3104                         goto handled;
3105                 }
3106                 default:
3107                         goto invalid;
3108                 }
3109
3110                 break;
3111         case WLAN_CATEGORY_PUBLIC:
3112                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3113                         goto invalid;
3114                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3115                         break;
3116                 if (!rx->sta)
3117                         break;
3118                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3119                         break;
3120                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3121                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3122                         break;
3123                 if (len < offsetof(struct ieee80211_mgmt,
3124                                    u.action.u.ext_chan_switch.variable))
3125                         goto invalid;
3126                 goto queue;
3127         case WLAN_CATEGORY_VHT:
3128                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3129                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3130                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3131                     sdata->vif.type != NL80211_IFTYPE_AP &&
3132                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3133                         break;
3134
3135                 /* verify action code is present */
3136                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3137                         goto invalid;
3138
3139                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3140                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3141                         /* verify opmode is present */
3142                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3143                                 goto invalid;
3144                         goto queue;
3145                 }
3146                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3147                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3148                                 goto invalid;
3149                         goto queue;
3150                 }
3151                 default:
3152                         break;
3153                 }
3154                 break;
3155         case WLAN_CATEGORY_BACK:
3156                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3157                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3158                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3159                     sdata->vif.type != NL80211_IFTYPE_AP &&
3160                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3161                         break;
3162
3163                 /* verify action_code is present */
3164                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3165                         break;
3166
3167                 switch (mgmt->u.action.u.addba_req.action_code) {
3168                 case WLAN_ACTION_ADDBA_REQ:
3169                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3170                                    sizeof(mgmt->u.action.u.addba_req)))
3171                                 goto invalid;
3172                         break;
3173                 case WLAN_ACTION_ADDBA_RESP:
3174                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3175                                    sizeof(mgmt->u.action.u.addba_resp)))
3176                                 goto invalid;
3177                         break;
3178                 case WLAN_ACTION_DELBA:
3179                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3180                                    sizeof(mgmt->u.action.u.delba)))
3181                                 goto invalid;
3182                         break;
3183                 default:
3184                         goto invalid;
3185                 }
3186
3187                 goto queue;
3188         case WLAN_CATEGORY_SPECTRUM_MGMT:
3189                 /* verify action_code is present */
3190                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3191                         break;
3192
3193                 switch (mgmt->u.action.u.measurement.action_code) {
3194                 case WLAN_ACTION_SPCT_MSR_REQ:
3195                         if (status->band != NL80211_BAND_5GHZ)
3196                                 break;
3197
3198                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3199                                    sizeof(mgmt->u.action.u.measurement)))
3200                                 break;
3201
3202                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3203                                 break;
3204
3205                         ieee80211_process_measurement_req(sdata, mgmt, len);
3206                         goto handled;
3207                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3208                         u8 *bssid;
3209                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3210                                    sizeof(mgmt->u.action.u.chan_switch)))
3211                                 break;
3212
3213                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3214                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3215                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3216                                 break;
3217
3218                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3219                                 bssid = sdata->u.mgd.bssid;
3220                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3221                                 bssid = sdata->u.ibss.bssid;
3222                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3223                                 bssid = mgmt->sa;
3224                         else
3225                                 break;
3226
3227                         if (!ether_addr_equal(mgmt->bssid, bssid))
3228                                 break;
3229
3230                         goto queue;
3231                         }
3232                 }
3233                 break;
3234         case WLAN_CATEGORY_SA_QUERY:
3235                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3236                            sizeof(mgmt->u.action.u.sa_query)))
3237                         break;
3238
3239                 switch (mgmt->u.action.u.sa_query.action) {
3240                 case WLAN_ACTION_SA_QUERY_REQUEST:
3241                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3242                                 break;
3243                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3244                         goto handled;
3245                 }
3246                 break;
3247         case WLAN_CATEGORY_SELF_PROTECTED:
3248                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3249                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3250                         break;
3251
3252                 switch (mgmt->u.action.u.self_prot.action_code) {
3253                 case WLAN_SP_MESH_PEERING_OPEN:
3254                 case WLAN_SP_MESH_PEERING_CLOSE:
3255                 case WLAN_SP_MESH_PEERING_CONFIRM:
3256                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3257                                 goto invalid;
3258                         if (sdata->u.mesh.user_mpm)
3259                                 /* userspace handles this frame */
3260                                 break;
3261                         goto queue;
3262                 case WLAN_SP_MGK_INFORM:
3263                 case WLAN_SP_MGK_ACK:
3264                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3265                                 goto invalid;
3266                         break;
3267                 }
3268                 break;
3269         case WLAN_CATEGORY_MESH_ACTION:
3270                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3271                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3272                         break;
3273
3274                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3275                         break;
3276                 if (mesh_action_is_path_sel(mgmt) &&
3277                     !mesh_path_sel_is_hwmp(sdata))
3278                         break;
3279                 goto queue;
3280         }
3281
3282         return RX_CONTINUE;
3283
3284  invalid:
3285         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3286         /* will return in the next handlers */
3287         return RX_CONTINUE;
3288
3289  handled:
3290         if (rx->sta)
3291                 rx->sta->rx_stats.packets++;
3292         dev_kfree_skb(rx->skb);
3293         return RX_QUEUED;
3294
3295  queue:
3296         skb_queue_tail(&sdata->skb_queue, rx->skb);
3297         ieee80211_queue_work(&local->hw, &sdata->work);
3298         if (rx->sta)
3299                 rx->sta->rx_stats.packets++;
3300         return RX_QUEUED;
3301 }
3302
3303 static ieee80211_rx_result debug_noinline
3304 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3305 {
3306         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3307         int sig = 0;
3308
3309         /* skip known-bad action frames and return them in the next handler */
3310         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3311                 return RX_CONTINUE;
3312
3313         /*
3314          * Getting here means the kernel doesn't know how to handle
3315          * it, but maybe userspace does ... include returned frames
3316          * so userspace can register for those to know whether ones
3317          * it transmitted were processed or returned.
3318          */
3319
3320         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3321             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3322                 sig = status->signal;
3323
3324         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3325                              rx->skb->data, rx->skb->len, 0)) {
3326                 if (rx->sta)
3327                         rx->sta->rx_stats.packets++;
3328                 dev_kfree_skb(rx->skb);
3329                 return RX_QUEUED;
3330         }
3331
3332         return RX_CONTINUE;
3333 }
3334
3335 static ieee80211_rx_result debug_noinline
3336 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3337 {
3338         struct ieee80211_local *local = rx->local;
3339         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3340         struct sk_buff *nskb;
3341         struct ieee80211_sub_if_data *sdata = rx->sdata;
3342         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3343
3344         if (!ieee80211_is_action(mgmt->frame_control))
3345                 return RX_CONTINUE;
3346
3347         /*
3348          * For AP mode, hostapd is responsible for handling any action
3349          * frames that we didn't handle, including returning unknown
3350          * ones. For all other modes we will return them to the sender,
3351          * setting the 0x80 bit in the action category, as required by
3352          * 802.11-2012 9.24.4.
3353          * Newer versions of hostapd shall also use the management frame
3354          * registration mechanisms, but older ones still use cooked
3355          * monitor interfaces so push all frames there.
3356          */
3357         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3358             (sdata->vif.type == NL80211_IFTYPE_AP ||
3359              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3360                 return RX_DROP_MONITOR;
3361
3362         if (is_multicast_ether_addr(mgmt->da))
3363                 return RX_DROP_MONITOR;
3364
3365         /* do not return rejected action frames */
3366         if (mgmt->u.action.category & 0x80)
3367                 return RX_DROP_UNUSABLE;
3368
3369         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3370                                GFP_ATOMIC);
3371         if (nskb) {
3372                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3373
3374                 nmgmt->u.action.category |= 0x80;
3375                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3376                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3377
3378                 memset(nskb->cb, 0, sizeof(nskb->cb));
3379
3380                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3381                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3382
3383                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3384                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3385                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3386                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3387                                 info->hw_queue =
3388                                         local->hw.offchannel_tx_hw_queue;
3389                 }
3390
3391                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3392                                             status->band, 0);
3393         }
3394         dev_kfree_skb(rx->skb);
3395         return RX_QUEUED;
3396 }
3397
3398 static ieee80211_rx_result debug_noinline
3399 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3400 {
3401         struct ieee80211_sub_if_data *sdata = rx->sdata;
3402         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3403         __le16 stype;
3404
3405         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3406
3407         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3408             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3409             sdata->vif.type != NL80211_IFTYPE_OCB &&
3410             sdata->vif.type != NL80211_IFTYPE_STATION)
3411                 return RX_DROP_MONITOR;
3412
3413         switch (stype) {
3414         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3415         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3416         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3417                 /* process for all: mesh, mlme, ibss */
3418                 break;
3419         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3420         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3421         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3422         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3423                 if (is_multicast_ether_addr(mgmt->da) &&
3424                     !is_broadcast_ether_addr(mgmt->da))
3425                         return RX_DROP_MONITOR;
3426
3427                 /* process only for station */
3428                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3429                         return RX_DROP_MONITOR;
3430                 break;
3431         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3432                 /* process only for ibss and mesh */
3433                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3434                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3435                         return RX_DROP_MONITOR;
3436                 break;
3437         default:
3438                 return RX_DROP_MONITOR;
3439         }
3440
3441         /* queue up frame and kick off work to process it */
3442         skb_queue_tail(&sdata->skb_queue, rx->skb);
3443         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3444         if (rx->sta)
3445                 rx->sta->rx_stats.packets++;
3446
3447         return RX_QUEUED;
3448 }
3449
3450 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3451                                         struct ieee80211_rate *rate)
3452 {
3453         struct ieee80211_sub_if_data *sdata;
3454         struct ieee80211_local *local = rx->local;
3455         struct sk_buff *skb = rx->skb, *skb2;
3456         struct net_device *prev_dev = NULL;
3457         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3458         int needed_headroom;
3459
3460         /*
3461          * If cooked monitor has been processed already, then
3462          * don't do it again. If not, set the flag.
3463          */
3464         if (rx->flags & IEEE80211_RX_CMNTR)
3465                 goto out_free_skb;
3466         rx->flags |= IEEE80211_RX_CMNTR;
3467
3468         /* If there are no cooked monitor interfaces, just free the SKB */
3469         if (!local->cooked_mntrs)
3470                 goto out_free_skb;
3471
3472         /* vendor data is long removed here */
3473         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3474         /* room for the radiotap header based on driver features */
3475         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3476
3477         if (skb_headroom(skb) < needed_headroom &&
3478             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3479                 goto out_free_skb;
3480
3481         /* prepend radiotap information */
3482         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3483                                          false);
3484
3485         skb_reset_mac_header(skb);
3486         skb->ip_summed = CHECKSUM_UNNECESSARY;
3487         skb->pkt_type = PACKET_OTHERHOST;
3488         skb->protocol = htons(ETH_P_802_2);
3489
3490         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3491                 if (!ieee80211_sdata_running(sdata))
3492                         continue;
3493
3494                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3495                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3496                         continue;
3497
3498                 if (prev_dev) {
3499                         skb2 = skb_clone(skb, GFP_ATOMIC);
3500                         if (skb2) {
3501                                 skb2->dev = prev_dev;
3502                                 netif_receive_skb(skb2);
3503                         }
3504                 }
3505
3506                 prev_dev = sdata->dev;
3507                 ieee80211_rx_stats(sdata->dev, skb->len);
3508         }
3509
3510         if (prev_dev) {
3511                 skb->dev = prev_dev;
3512                 netif_receive_skb(skb);
3513                 return;
3514         }
3515
3516  out_free_skb:
3517         dev_kfree_skb(skb);
3518 }
3519
3520 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3521                                          ieee80211_rx_result res)
3522 {
3523         switch (res) {
3524         case RX_DROP_MONITOR:
3525                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3526                 if (rx->sta)
3527                         rx->sta->rx_stats.dropped++;
3528                 /* fall through */
3529         case RX_CONTINUE: {
3530                 struct ieee80211_rate *rate = NULL;
3531                 struct ieee80211_supported_band *sband;
3532                 struct ieee80211_rx_status *status;
3533
3534                 status = IEEE80211_SKB_RXCB((rx->skb));
3535
3536                 sband = rx->local->hw.wiphy->bands[status->band];
3537                 if (status->encoding == RX_ENC_LEGACY)
3538                         rate = &sband->bitrates[status->rate_idx];
3539
3540                 ieee80211_rx_cooked_monitor(rx, rate);
3541                 break;
3542                 }
3543         case RX_DROP_UNUSABLE:
3544                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3545                 if (rx->sta)
3546                         rx->sta->rx_stats.dropped++;
3547                 dev_kfree_skb(rx->skb);
3548                 break;
3549         case RX_QUEUED:
3550                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3551                 break;
3552         }
3553 }
3554
3555 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3556                                   struct sk_buff_head *frames)
3557 {
3558         ieee80211_rx_result res = RX_DROP_MONITOR;
3559         struct sk_buff *skb;
3560
3561 #define CALL_RXH(rxh)                   \
3562         do {                            \
3563                 res = rxh(rx);          \
3564                 if (res != RX_CONTINUE) \
3565                         goto rxh_next;  \
3566         } while (0)
3567
3568         /* Lock here to avoid hitting all of the data used in the RX
3569          * path (e.g. key data, station data, ...) concurrently when
3570          * a frame is released from the reorder buffer due to timeout
3571          * from the timer, potentially concurrently with RX from the
3572          * driver.
3573          */
3574         spin_lock_bh(&rx->local->rx_path_lock);
3575
3576         while ((skb = __skb_dequeue(frames))) {
3577                 /*
3578                  * all the other fields are valid across frames
3579                  * that belong to an aMPDU since they are on the
3580                  * same TID from the same station
3581                  */
3582                 rx->skb = skb;
3583
3584                 CALL_RXH(ieee80211_rx_h_check_more_data);
3585                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3586                 CALL_RXH(ieee80211_rx_h_sta_process);
3587                 CALL_RXH(ieee80211_rx_h_decrypt);
3588                 CALL_RXH(ieee80211_rx_h_defragment);
3589                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3590                 /* must be after MMIC verify so header is counted in MPDU mic */
3591 #ifdef CONFIG_MAC80211_MESH
3592                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3593                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3594 #endif
3595                 CALL_RXH(ieee80211_rx_h_amsdu);
3596                 CALL_RXH(ieee80211_rx_h_data);
3597
3598                 /* special treatment -- needs the queue */
3599                 res = ieee80211_rx_h_ctrl(rx, frames);
3600                 if (res != RX_CONTINUE)
3601                         goto rxh_next;
3602
3603                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3604                 CALL_RXH(ieee80211_rx_h_action);
3605                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3606                 CALL_RXH(ieee80211_rx_h_action_return);
3607                 CALL_RXH(ieee80211_rx_h_mgmt);
3608
3609  rxh_next:
3610                 ieee80211_rx_handlers_result(rx, res);
3611
3612 #undef CALL_RXH
3613         }
3614
3615         spin_unlock_bh(&rx->local->rx_path_lock);
3616 }
3617
3618 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3619 {
3620         struct sk_buff_head reorder_release;
3621         ieee80211_rx_result res = RX_DROP_MONITOR;
3622
3623         __skb_queue_head_init(&reorder_release);
3624
3625 #define CALL_RXH(rxh)                   \
3626         do {                            \
3627                 res = rxh(rx);          \
3628                 if (res != RX_CONTINUE) \
3629                         goto rxh_next;  \
3630         } while (0)
3631
3632         CALL_RXH(ieee80211_rx_h_check_dup);
3633         CALL_RXH(ieee80211_rx_h_check);
3634
3635         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3636
3637         ieee80211_rx_handlers(rx, &reorder_release);
3638         return;
3639
3640  rxh_next:
3641         ieee80211_rx_handlers_result(rx, res);
3642
3643 #undef CALL_RXH
3644 }
3645
3646 /*
3647  * This function makes calls into the RX path, therefore
3648  * it has to be invoked under RCU read lock.
3649  */
3650 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3651 {
3652         struct sk_buff_head frames;
3653         struct ieee80211_rx_data rx = {
3654                 .sta = sta,
3655                 .sdata = sta->sdata,
3656                 .local = sta->local,
3657                 /* This is OK -- must be QoS data frame */
3658                 .security_idx = tid,
3659                 .seqno_idx = tid,
3660                 .napi = NULL, /* must be NULL to not have races */
3661         };
3662         struct tid_ampdu_rx *tid_agg_rx;
3663
3664         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3665         if (!tid_agg_rx)
3666                 return;
3667
3668         __skb_queue_head_init(&frames);
3669
3670         spin_lock(&tid_agg_rx->reorder_lock);
3671         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3672         spin_unlock(&tid_agg_rx->reorder_lock);
3673
3674         if (!skb_queue_empty(&frames)) {
3675                 struct ieee80211_event event = {
3676                         .type = BA_FRAME_TIMEOUT,
3677                         .u.ba.tid = tid,
3678                         .u.ba.sta = &sta->sta,
3679                 };
3680                 drv_event_callback(rx.local, rx.sdata, &event);
3681         }
3682
3683         ieee80211_rx_handlers(&rx, &frames);
3684 }
3685
3686 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3687                                           u16 ssn, u64 filtered,
3688                                           u16 received_mpdus)
3689 {
3690         struct sta_info *sta;
3691         struct tid_ampdu_rx *tid_agg_rx;
3692         struct sk_buff_head frames;
3693         struct ieee80211_rx_data rx = {
3694                 /* This is OK -- must be QoS data frame */
3695                 .security_idx = tid,
3696                 .seqno_idx = tid,
3697         };
3698         int i, diff;
3699
3700         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3701                 return;
3702
3703         __skb_queue_head_init(&frames);
3704
3705         sta = container_of(pubsta, struct sta_info, sta);
3706
3707         rx.sta = sta;
3708         rx.sdata = sta->sdata;
3709         rx.local = sta->local;
3710
3711         rcu_read_lock();
3712         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3713         if (!tid_agg_rx)
3714                 goto out;
3715
3716         spin_lock_bh(&tid_agg_rx->reorder_lock);
3717
3718         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3719                 int release;
3720
3721                 /* release all frames in the reorder buffer */
3722                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3723                            IEEE80211_SN_MODULO;
3724                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3725                                                  release, &frames);
3726                 /* update ssn to match received ssn */
3727                 tid_agg_rx->head_seq_num = ssn;
3728         } else {
3729                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3730                                                  &frames);
3731         }
3732
3733         /* handle the case that received ssn is behind the mac ssn.
3734          * it can be tid_agg_rx->buf_size behind and still be valid */
3735         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3736         if (diff >= tid_agg_rx->buf_size) {
3737                 tid_agg_rx->reorder_buf_filtered = 0;
3738                 goto release;
3739         }
3740         filtered = filtered >> diff;
3741         ssn += diff;
3742
3743         /* update bitmap */
3744         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3745                 int index = (ssn + i) % tid_agg_rx->buf_size;
3746
3747                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3748                 if (filtered & BIT_ULL(i))
3749                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3750         }
3751
3752         /* now process also frames that the filter marking released */
3753         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3754
3755 release:
3756         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3757
3758         ieee80211_rx_handlers(&rx, &frames);
3759
3760  out:
3761         rcu_read_unlock();
3762 }
3763 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3764
3765 /* main receive path */
3766
3767 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3768 {
3769         struct ieee80211_sub_if_data *sdata = rx->sdata;
3770         struct sk_buff *skb = rx->skb;
3771         struct ieee80211_hdr *hdr = (void *)skb->data;
3772         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3773         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3774         bool multicast = is_multicast_ether_addr(hdr->addr1);
3775
3776         switch (sdata->vif.type) {
3777         case NL80211_IFTYPE_STATION:
3778                 if (!bssid && !sdata->u.mgd.use_4addr)
3779                         return false;
3780                 if (multicast)
3781                         return true;
3782                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3783         case NL80211_IFTYPE_ADHOC:
3784                 if (!bssid)
3785                         return false;
3786                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3787                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3788                         return false;
3789                 if (ieee80211_is_beacon(hdr->frame_control))
3790                         return true;
3791                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3792                         return false;
3793                 if (!multicast &&
3794                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3795                         return false;
3796                 if (!rx->sta) {
3797                         int rate_idx;
3798                         if (status->encoding != RX_ENC_LEGACY)
3799                                 rate_idx = 0; /* TODO: HT/VHT rates */
3800                         else
3801                                 rate_idx = status->rate_idx;
3802                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3803                                                  BIT(rate_idx));
3804                 }
3805                 return true;
3806         case NL80211_IFTYPE_OCB:
3807                 if (!bssid)
3808                         return false;
3809                 if (!ieee80211_is_data_present(hdr->frame_control))
3810                         return false;
3811                 if (!is_broadcast_ether_addr(bssid))
3812                         return false;
3813                 if (!multicast &&
3814                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3815                         return false;
3816                 if (!rx->sta) {
3817                         int rate_idx;
3818                         if (status->encoding != RX_ENC_LEGACY)
3819                                 rate_idx = 0; /* TODO: HT rates */
3820                         else
3821                                 rate_idx = status->rate_idx;
3822                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3823                                                 BIT(rate_idx));
3824                 }
3825                 return true;
3826         case NL80211_IFTYPE_MESH_POINT:
3827                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3828                         return false;
3829                 if (multicast)
3830                         return true;
3831                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3832         case NL80211_IFTYPE_AP_VLAN:
3833         case NL80211_IFTYPE_AP:
3834                 if (!bssid)
3835                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3836
3837                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3838                         /*
3839                          * Accept public action frames even when the
3840                          * BSSID doesn't match, this is used for P2P
3841                          * and location updates. Note that mac80211
3842                          * itself never looks at these frames.
3843                          */
3844                         if (!multicast &&
3845                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3846                                 return false;
3847                         if (ieee80211_is_public_action(hdr, skb->len))
3848                                 return true;
3849                         return ieee80211_is_beacon(hdr->frame_control);
3850                 }
3851
3852                 if (!ieee80211_has_tods(hdr->frame_control)) {
3853                         /* ignore data frames to TDLS-peers */
3854                         if (ieee80211_is_data(hdr->frame_control))
3855                                 return false;
3856                         /* ignore action frames to TDLS-peers */
3857                         if (ieee80211_is_action(hdr->frame_control) &&
3858                             !is_broadcast_ether_addr(bssid) &&
3859                             !ether_addr_equal(bssid, hdr->addr1))
3860                                 return false;
3861                 }
3862
3863                 /*
3864                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3865                  * the BSSID - we've checked that already but may have accepted
3866                  * the wildcard (ff:ff:ff:ff:ff:ff).
3867                  *
3868                  * It also says:
3869                  *      The BSSID of the Data frame is determined as follows:
3870                  *      a) If the STA is contained within an AP or is associated
3871                  *         with an AP, the BSSID is the address currently in use
3872                  *         by the STA contained in the AP.
3873                  *
3874                  * So we should not accept data frames with an address that's
3875                  * multicast.
3876                  *
3877                  * Accepting it also opens a security problem because stations
3878                  * could encrypt it with the GTK and inject traffic that way.
3879                  */
3880                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3881                         return false;
3882
3883                 return true;
3884         case NL80211_IFTYPE_WDS:
3885                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3886                         return false;
3887                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3888         case NL80211_IFTYPE_P2P_DEVICE:
3889                 return ieee80211_is_public_action(hdr, skb->len) ||
3890                        ieee80211_is_probe_req(hdr->frame_control) ||
3891                        ieee80211_is_probe_resp(hdr->frame_control) ||
3892                        ieee80211_is_beacon(hdr->frame_control);
3893         case NL80211_IFTYPE_NAN:
3894                 /* Currently no frames on NAN interface are allowed */
3895                 return false;
3896         default:
3897                 break;
3898         }
3899
3900         WARN_ON_ONCE(1);
3901         return false;
3902 }
3903
3904 void ieee80211_check_fast_rx(struct sta_info *sta)
3905 {
3906         struct ieee80211_sub_if_data *sdata = sta->sdata;
3907         struct ieee80211_local *local = sdata->local;
3908         struct ieee80211_key *key;
3909         struct ieee80211_fast_rx fastrx = {
3910                 .dev = sdata->dev,
3911                 .vif_type = sdata->vif.type,
3912                 .control_port_protocol = sdata->control_port_protocol,
3913         }, *old, *new = NULL;
3914         bool assign = false;
3915
3916         /* use sparse to check that we don't return without updating */
3917         __acquire(check_fast_rx);
3918
3919         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3920         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3921         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3922         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3923
3924         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3925
3926         /* fast-rx doesn't do reordering */
3927         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3928             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3929                 goto clear;
3930
3931         switch (sdata->vif.type) {
3932         case NL80211_IFTYPE_STATION:
3933                 if (sta->sta.tdls) {
3934                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3935                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3936                         fastrx.expected_ds_bits = 0;
3937                 } else {
3938                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3939                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3940                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3941                         fastrx.expected_ds_bits =
3942                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3943                 }
3944
3945                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3946                         fastrx.expected_ds_bits |=
3947                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3948                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3949                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3950                 }
3951
3952                 if (!sdata->u.mgd.powersave)
3953                         break;
3954
3955                 /* software powersave is a huge mess, avoid all of it */
3956                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3957                         goto clear;
3958                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3959                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3960                         goto clear;
3961                 break;
3962         case NL80211_IFTYPE_AP_VLAN:
3963         case NL80211_IFTYPE_AP:
3964                 /* parallel-rx requires this, at least with calls to
3965                  * ieee80211_sta_ps_transition()
3966                  */
3967                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3968                         goto clear;
3969                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3970                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3971                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3972
3973                 fastrx.internal_forward =
3974                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3975                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3976                          !sdata->u.vlan.sta);
3977
3978                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3979                     sdata->u.vlan.sta) {
3980                         fastrx.expected_ds_bits |=
3981                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3982                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3983                         fastrx.internal_forward = 0;
3984                 }
3985
3986                 break;
3987         default:
3988                 goto clear;
3989         }
3990
3991         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3992                 goto clear;
3993
3994         rcu_read_lock();
3995         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3996         if (key) {
3997                 switch (key->conf.cipher) {
3998                 case WLAN_CIPHER_SUITE_TKIP:
3999                         /* we don't want to deal with MMIC in fast-rx */
4000                         goto clear_rcu;
4001                 case WLAN_CIPHER_SUITE_CCMP:
4002                 case WLAN_CIPHER_SUITE_CCMP_256:
4003                 case WLAN_CIPHER_SUITE_GCMP:
4004                 case WLAN_CIPHER_SUITE_GCMP_256:
4005                         break;
4006                 default:
4007                         /* we also don't want to deal with WEP or cipher scheme
4008                          * since those require looking up the key idx in the
4009                          * frame, rather than assuming the PTK is used
4010                          * (we need to revisit this once we implement the real
4011                          * PTK index, which is now valid in the spec, but we
4012                          * haven't implemented that part yet)
4013                          */
4014                         goto clear_rcu;
4015                 }
4016
4017                 fastrx.key = true;
4018                 fastrx.icv_len = key->conf.icv_len;
4019         }
4020
4021         assign = true;
4022  clear_rcu:
4023         rcu_read_unlock();
4024  clear:
4025         __release(check_fast_rx);
4026
4027         if (assign)
4028                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4029
4030         spin_lock_bh(&sta->lock);
4031         old = rcu_dereference_protected(sta->fast_rx, true);
4032         rcu_assign_pointer(sta->fast_rx, new);
4033         spin_unlock_bh(&sta->lock);
4034
4035         if (old)
4036                 kfree_rcu(old, rcu_head);
4037 }
4038
4039 void ieee80211_clear_fast_rx(struct sta_info *sta)
4040 {
4041         struct ieee80211_fast_rx *old;
4042
4043         spin_lock_bh(&sta->lock);
4044         old = rcu_dereference_protected(sta->fast_rx, true);
4045         RCU_INIT_POINTER(sta->fast_rx, NULL);
4046         spin_unlock_bh(&sta->lock);
4047
4048         if (old)
4049                 kfree_rcu(old, rcu_head);
4050 }
4051
4052 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4053 {
4054         struct ieee80211_local *local = sdata->local;
4055         struct sta_info *sta;
4056
4057         lockdep_assert_held(&local->sta_mtx);
4058
4059         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4060                 if (sdata != sta->sdata &&
4061                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4062                         continue;
4063                 ieee80211_check_fast_rx(sta);
4064         }
4065 }
4066
4067 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4068 {
4069         struct ieee80211_local *local = sdata->local;
4070
4071         mutex_lock(&local->sta_mtx);
4072         __ieee80211_check_fast_rx_iface(sdata);
4073         mutex_unlock(&local->sta_mtx);
4074 }
4075
4076 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4077                                      struct ieee80211_fast_rx *fast_rx)
4078 {
4079         struct sk_buff *skb = rx->skb;
4080         struct ieee80211_hdr *hdr = (void *)skb->data;
4081         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4082         struct sta_info *sta = rx->sta;
4083         int orig_len = skb->len;
4084         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4085         int snap_offs = hdrlen;
4086         struct {
4087                 u8 snap[sizeof(rfc1042_header)];
4088                 __be16 proto;
4089         } *payload __aligned(2);
4090         struct {
4091                 u8 da[ETH_ALEN];
4092                 u8 sa[ETH_ALEN];
4093         } addrs __aligned(2);
4094         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4095
4096         if (fast_rx->uses_rss)
4097                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4098
4099         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4100          * to a common data structure; drivers can implement that per queue
4101          * but we don't have that information in mac80211
4102          */
4103         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4104                 return false;
4105
4106 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4107
4108         /* If using encryption, we also need to have:
4109          *  - PN_VALIDATED: similar, but the implementation is tricky
4110          *  - DECRYPTED: necessary for PN_VALIDATED
4111          */
4112         if (fast_rx->key &&
4113             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4114                 return false;
4115
4116         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4117                 return false;
4118
4119         if (unlikely(ieee80211_is_frag(hdr)))
4120                 return false;
4121
4122         /* Since our interface address cannot be multicast, this
4123          * implicitly also rejects multicast frames without the
4124          * explicit check.
4125          *
4126          * We shouldn't get any *data* frames not addressed to us
4127          * (AP mode will accept multicast *management* frames), but
4128          * punting here will make it go through the full checks in
4129          * ieee80211_accept_frame().
4130          */
4131         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4132                 return false;
4133
4134         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4135                                               IEEE80211_FCTL_TODS)) !=
4136             fast_rx->expected_ds_bits)
4137                 return false;
4138
4139         /* assign the key to drop unencrypted frames (later)
4140          * and strip the IV/MIC if necessary
4141          */
4142         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4143                 /* GCMP header length is the same */
4144                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4145         }
4146
4147         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4148                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4149                         goto drop;
4150
4151                 payload = (void *)(skb->data + snap_offs);
4152
4153                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4154                         return false;
4155
4156                 /* Don't handle these here since they require special code.
4157                  * Accept AARP and IPX even though they should come with a
4158                  * bridge-tunnel header - but if we get them this way then
4159                  * there's little point in discarding them.
4160                  */
4161                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4162                              payload->proto == fast_rx->control_port_protocol))
4163                         return false;
4164         }
4165
4166         /* after this point, don't punt to the slowpath! */
4167
4168         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4169             pskb_trim(skb, skb->len - fast_rx->icv_len))
4170                 goto drop;
4171
4172         if (unlikely(fast_rx->sta_notify)) {
4173                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4174                 fast_rx->sta_notify = false;
4175         }
4176
4177         /* statistics part of ieee80211_rx_h_sta_process() */
4178         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4179                 stats->last_signal = status->signal;
4180                 if (!fast_rx->uses_rss)
4181                         ewma_signal_add(&sta->rx_stats_avg.signal,
4182                                         -status->signal);
4183         }
4184
4185         if (status->chains) {
4186                 int i;
4187
4188                 stats->chains = status->chains;
4189                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4190                         int signal = status->chain_signal[i];
4191
4192                         if (!(status->chains & BIT(i)))
4193                                 continue;
4194
4195                         stats->chain_signal_last[i] = signal;
4196                         if (!fast_rx->uses_rss)
4197                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4198                                                 -signal);
4199                 }
4200         }
4201         /* end of statistics */
4202
4203         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4204                 goto drop;
4205
4206         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4207                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4208                     RX_QUEUED)
4209                         goto drop;
4210
4211                 return true;
4212         }
4213
4214         stats->last_rx = jiffies;
4215         stats->last_rate = sta_stats_encode_rate(status);
4216
4217         stats->fragments++;
4218         stats->packets++;
4219
4220         /* do the header conversion - first grab the addresses */
4221         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4222         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4223         /* remove the SNAP but leave the ethertype */
4224         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4225         /* push the addresses in front */
4226         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4227
4228         skb->dev = fast_rx->dev;
4229
4230         ieee80211_rx_stats(fast_rx->dev, skb->len);
4231
4232         /* The seqno index has the same property as needed
4233          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4234          * for non-QoS-data frames. Here we know it's a data
4235          * frame, so count MSDUs.
4236          */
4237         u64_stats_update_begin(&stats->syncp);
4238         stats->msdu[rx->seqno_idx]++;
4239         stats->bytes += orig_len;
4240         u64_stats_update_end(&stats->syncp);
4241
4242         if (fast_rx->internal_forward) {
4243                 struct sk_buff *xmit_skb = NULL;
4244                 if (is_multicast_ether_addr(addrs.da)) {
4245                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4246                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4247                            sta_info_get(rx->sdata, addrs.da)) {
4248                         xmit_skb = skb;
4249                         skb = NULL;
4250                 }
4251
4252                 if (xmit_skb) {
4253                         /*
4254                          * Send to wireless media and increase priority by 256
4255                          * to keep the received priority instead of
4256                          * reclassifying the frame (see cfg80211_classify8021d).
4257                          */
4258                         xmit_skb->priority += 256;
4259                         xmit_skb->protocol = htons(ETH_P_802_3);
4260                         skb_reset_network_header(xmit_skb);
4261                         skb_reset_mac_header(xmit_skb);
4262                         dev_queue_xmit(xmit_skb);
4263                 }
4264
4265                 if (!skb)
4266                         return true;
4267         }
4268
4269         /* deliver to local stack */
4270         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4271         memset(skb->cb, 0, sizeof(skb->cb));
4272         if (rx->napi)
4273                 napi_gro_receive(rx->napi, skb);
4274         else
4275                 netif_receive_skb(skb);
4276
4277         return true;
4278  drop:
4279         dev_kfree_skb(skb);
4280         stats->dropped++;
4281         return true;
4282 }
4283
4284 /*
4285  * This function returns whether or not the SKB
4286  * was destined for RX processing or not, which,
4287  * if consume is true, is equivalent to whether
4288  * or not the skb was consumed.
4289  */
4290 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4291                                             struct sk_buff *skb, bool consume)
4292 {
4293         struct ieee80211_local *local = rx->local;
4294         struct ieee80211_sub_if_data *sdata = rx->sdata;
4295
4296         rx->skb = skb;
4297
4298         /* See if we can do fast-rx; if we have to copy we already lost,
4299          * so punt in that case. We should never have to deliver a data
4300          * frame to multiple interfaces anyway.
4301          *
4302          * We skip the ieee80211_accept_frame() call and do the necessary
4303          * checking inside ieee80211_invoke_fast_rx().
4304          */
4305         if (consume && rx->sta) {
4306                 struct ieee80211_fast_rx *fast_rx;
4307
4308                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4309                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4310                         return true;
4311         }
4312
4313         if (!ieee80211_accept_frame(rx))
4314                 return false;
4315
4316         if (!consume) {
4317                 skb = skb_copy(skb, GFP_ATOMIC);
4318                 if (!skb) {
4319                         if (net_ratelimit())
4320                                 wiphy_debug(local->hw.wiphy,
4321                                         "failed to copy skb for %s\n",
4322                                         sdata->name);
4323                         return true;
4324                 }
4325
4326                 rx->skb = skb;
4327         }
4328
4329         ieee80211_invoke_rx_handlers(rx);
4330         return true;
4331 }
4332
4333 /*
4334  * This is the actual Rx frames handler. as it belongs to Rx path it must
4335  * be called with rcu_read_lock protection.
4336  */
4337 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4338                                          struct ieee80211_sta *pubsta,
4339                                          struct sk_buff *skb,
4340                                          struct napi_struct *napi)
4341 {
4342         struct ieee80211_local *local = hw_to_local(hw);
4343         struct ieee80211_sub_if_data *sdata;
4344         struct ieee80211_hdr *hdr;
4345         __le16 fc;
4346         struct ieee80211_rx_data rx;
4347         struct ieee80211_sub_if_data *prev;
4348         struct rhlist_head *tmp;
4349         int err = 0;
4350
4351         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4352         memset(&rx, 0, sizeof(rx));
4353         rx.skb = skb;
4354         rx.local = local;
4355         rx.napi = napi;
4356
4357         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4358                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4359
4360         if (ieee80211_is_mgmt(fc)) {
4361                 /* drop frame if too short for header */
4362                 if (skb->len < ieee80211_hdrlen(fc))
4363                         err = -ENOBUFS;
4364                 else
4365                         err = skb_linearize(skb);
4366         } else {
4367                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4368         }
4369
4370         if (err) {
4371                 dev_kfree_skb(skb);
4372                 return;
4373         }
4374
4375         hdr = (struct ieee80211_hdr *)skb->data;
4376         ieee80211_parse_qos(&rx);
4377         ieee80211_verify_alignment(&rx);
4378
4379         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4380                      ieee80211_is_beacon(hdr->frame_control)))
4381                 ieee80211_scan_rx(local, skb);
4382
4383         if (ieee80211_is_data(fc)) {
4384                 struct sta_info *sta, *prev_sta;
4385
4386                 if (pubsta) {
4387                         rx.sta = container_of(pubsta, struct sta_info, sta);
4388                         rx.sdata = rx.sta->sdata;
4389                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4390                                 return;
4391                         goto out;
4392                 }
4393
4394                 prev_sta = NULL;
4395
4396                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4397                         if (!prev_sta) {
4398                                 prev_sta = sta;
4399                                 continue;
4400                         }
4401
4402                         rx.sta = prev_sta;
4403                         rx.sdata = prev_sta->sdata;
4404                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4405
4406                         prev_sta = sta;
4407                 }
4408
4409                 if (prev_sta) {
4410                         rx.sta = prev_sta;
4411                         rx.sdata = prev_sta->sdata;
4412
4413                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4414                                 return;
4415                         goto out;
4416                 }
4417         }
4418
4419         prev = NULL;
4420
4421         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4422                 if (!ieee80211_sdata_running(sdata))
4423                         continue;
4424
4425                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4426                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4427                         continue;
4428
4429                 /*
4430                  * frame is destined for this interface, but if it's
4431                  * not also for the previous one we handle that after
4432                  * the loop to avoid copying the SKB once too much
4433                  */
4434
4435                 if (!prev) {
4436                         prev = sdata;
4437                         continue;
4438                 }
4439
4440                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4441                 rx.sdata = prev;
4442                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4443
4444                 prev = sdata;
4445         }
4446
4447         if (prev) {
4448                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4449                 rx.sdata = prev;
4450
4451                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4452                         return;
4453         }
4454
4455  out:
4456         dev_kfree_skb(skb);
4457 }
4458
4459 /*
4460  * This is the receive path handler. It is called by a low level driver when an
4461  * 802.11 MPDU is received from the hardware.
4462  */
4463 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4464                        struct sk_buff *skb, struct napi_struct *napi)
4465 {
4466         struct ieee80211_local *local = hw_to_local(hw);
4467         struct ieee80211_rate *rate = NULL;
4468         struct ieee80211_supported_band *sband;
4469         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4470
4471         WARN_ON_ONCE(softirq_count() == 0);
4472
4473         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4474                 goto drop;
4475
4476         sband = local->hw.wiphy->bands[status->band];
4477         if (WARN_ON(!sband))
4478                 goto drop;
4479
4480         /*
4481          * If we're suspending, it is possible although not too likely
4482          * that we'd be receiving frames after having already partially
4483          * quiesced the stack. We can't process such frames then since
4484          * that might, for example, cause stations to be added or other
4485          * driver callbacks be invoked.
4486          */
4487         if (unlikely(local->quiescing || local->suspended))
4488                 goto drop;
4489
4490         /* We might be during a HW reconfig, prevent Rx for the same reason */
4491         if (unlikely(local->in_reconfig))
4492                 goto drop;
4493
4494         /*
4495          * The same happens when we're not even started,
4496          * but that's worth a warning.
4497          */
4498         if (WARN_ON(!local->started))
4499                 goto drop;
4500
4501         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4502                 /*
4503                  * Validate the rate, unless a PLCP error means that
4504                  * we probably can't have a valid rate here anyway.
4505                  */
4506
4507                 switch (status->encoding) {
4508                 case RX_ENC_HT:
4509                         /*
4510                          * rate_idx is MCS index, which can be [0-76]
4511                          * as documented on:
4512                          *
4513                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4514                          *
4515                          * Anything else would be some sort of driver or
4516                          * hardware error. The driver should catch hardware
4517                          * errors.
4518                          */
4519                         if (WARN(status->rate_idx > 76,
4520                                  "Rate marked as an HT rate but passed "
4521                                  "status->rate_idx is not "
4522                                  "an MCS index [0-76]: %d (0x%02x)\n",
4523                                  status->rate_idx,
4524                                  status->rate_idx))
4525                                 goto drop;
4526                         break;
4527                 case RX_ENC_VHT:
4528                         if (WARN_ONCE(status->rate_idx > 9 ||
4529                                       !status->nss ||
4530                                       status->nss > 8,
4531                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4532                                       status->rate_idx, status->nss))
4533                                 goto drop;
4534                         break;
4535                 case RX_ENC_HE:
4536                         if (WARN_ONCE(status->rate_idx > 11 ||
4537                                       !status->nss ||
4538                                       status->nss > 8,
4539                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4540                                       status->rate_idx, status->nss))
4541                                 goto drop;
4542                         break;
4543                 default:
4544                         WARN_ON_ONCE(1);
4545                         /* fall through */
4546                 case RX_ENC_LEGACY:
4547                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4548                                 goto drop;
4549                         rate = &sband->bitrates[status->rate_idx];
4550                 }
4551         }
4552
4553         status->rx_flags = 0;
4554
4555         /*
4556          * key references and virtual interfaces are protected using RCU
4557          * and this requires that we are in a read-side RCU section during
4558          * receive processing
4559          */
4560         rcu_read_lock();
4561
4562         /*
4563          * Frames with failed FCS/PLCP checksum are not returned,
4564          * all other frames are returned without radiotap header
4565          * if it was previously present.
4566          * Also, frames with less than 16 bytes are dropped.
4567          */
4568         skb = ieee80211_rx_monitor(local, skb, rate);
4569         if (!skb) {
4570                 rcu_read_unlock();
4571                 return;
4572         }
4573
4574         ieee80211_tpt_led_trig_rx(local,
4575                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4576                         skb->len);
4577
4578         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4579
4580         rcu_read_unlock();
4581
4582         return;
4583  drop:
4584         kfree_skb(skb);
4585 }
4586 EXPORT_SYMBOL(ieee80211_rx_napi);
4587
4588 /* This is a version of the rx handler that can be called from hard irq
4589  * context. Post the skb on the queue and schedule the tasklet */
4590 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4591 {
4592         struct ieee80211_local *local = hw_to_local(hw);
4593
4594         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4595
4596         skb->pkt_type = IEEE80211_RX_MSG;
4597         skb_queue_tail(&local->skb_queue, skb);
4598         tasklet_schedule(&local->tasklet);
4599 }
4600 EXPORT_SYMBOL(ieee80211_rx_irqsafe);