net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <[email protected]>
   5  * Copyright 2007-2010  Johannes Berg <[email protected]>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018-2019 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         /* vendor presence bitmap */
 147         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 148                 len += 4;
 149
 150         if (ieee80211_have_rx_timestamp(status)) {
 151                 len = ALIGN(len, 8);
 152                 len += 8;
 153         }
 154         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 155                 len += 1;
 156
 157         /* antenna field, if we don't have per-chain info */
 158         if (!status->chains)
 159                 len += 1;
 160
 161         /* padding for RX_FLAGS if necessary */
 162         len = ALIGN(len, 2);
 163
 164         if (status->encoding == RX_ENC_HT) /* HT info */
 165                 len += 3;
 166
 167         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 168                 len = ALIGN(len, 4);
 169                 len += 8;
 170         }
 171
 172         if (status->encoding == RX_ENC_VHT) {
 173                 len = ALIGN(len, 2);
 174                 len += 12;
 175         }
 176
 177         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 178                 len = ALIGN(len, 8);
 179                 len += 12;
 180         }
 181
 182         if (status->encoding == RX_ENC_HE &&
 183             status->flag & RX_FLAG_RADIOTAP_HE) {
 184                 len = ALIGN(len, 2);
 185                 len += 12;
 186                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 187         }
 188
 189         if (status->encoding == RX_ENC_HE &&
 190             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 191                 len = ALIGN(len, 2);
 192                 len += 12;
 193                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 194         }
 195
 196         if (status->flag & RX_FLAG_NO_PSDU)
 197                 len += 1;
 198
 199         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 200                 len = ALIGN(len, 2);
 201                 len += 4;
 202                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 203         }
 204
 205         if (status->chains) {
 206                 /* antenna and antenna signal fields */
 207                 len += 2 * hweight8(status->chains);
 208         }
 209
 210         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 211                 struct ieee80211_vendor_radiotap *rtap;
 212                 int vendor_data_offset = 0;
 213
 214                 /*
 215                  * The position to look at depends on the existence (or non-
 216                  * existence) of other elements, so take that into account...
 217                  */
 218                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 219                         vendor_data_offset +=
 220                                 sizeof(struct ieee80211_radiotap_he);
 221                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 222                         vendor_data_offset +=
 223                                 sizeof(struct ieee80211_radiotap_he_mu);
 224                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 225                         vendor_data_offset +=
 226                                 sizeof(struct ieee80211_radiotap_lsig);
 227
 228                 rtap = (void *)&skb->data[vendor_data_offset];
 229
 230                 /* alignment for fixed 6-byte vendor data header */
 231                 len = ALIGN(len, 2);
 232                 /* vendor data header */
 233                 len += 6;
 234                 if (WARN_ON(rtap->align == 0))
 235                         rtap->align = 1;
 236                 len = ALIGN(len, rtap->align);
 237                 len += rtap->len + rtap->pad;
 238         }
 239
 240         return len;
 241 }
 242
 243 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 244                                          struct sk_buff *skb,
 245                                          int rtap_space)
 246 {
 247         struct {
 248                 struct ieee80211_hdr_3addr hdr;
 249                 u8 category;
 250                 u8 action_code;
 251         } __packed __aligned(2) action;
 252
 253         if (!sdata)
 254                 return;
 255
 256         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 257
 258         if (skb->len < rtap_space + sizeof(action) +
 259                        VHT_MUMIMO_GROUPS_DATA_LEN)
 260                 return;
 261
 262         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 263                 return;
 264
 265         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 266
 267         if (!ieee80211_is_action(action.hdr.frame_control))
 268                 return;
 269
 270         if (action.category != WLAN_CATEGORY_VHT)
 271                 return;
 272
 273         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 274                 return;
 275
 276         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 277                 return;
 278
 279         skb = skb_copy(skb, GFP_ATOMIC);
 280         if (!skb)
 281                 return;
 282
 283         skb_queue_tail(&sdata->skb_queue, skb);
 284         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 285 }
 286
 287 /*
 288  * ieee80211_add_rx_radiotap_header - add radiotap header
 289  *
 290  * add a radiotap header containing all the fields which the hardware provided.
 291  */
 292 static void
 293 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 294                                  struct sk_buff *skb,
 295                                  struct ieee80211_rate *rate,
 296                                  int rtap_len, bool has_fcs)
 297 {
 298         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 299         struct ieee80211_radiotap_header *rthdr;
 300         unsigned char *pos;
 301         __le32 *it_present;
 302         u32 it_present_val;
 303         u16 rx_flags = 0;
 304         u16 channel_flags = 0;
 305         int mpdulen, chain;
 306         unsigned long chains = status->chains;
 307         struct ieee80211_vendor_radiotap rtap = {};
 308         struct ieee80211_radiotap_he he = {};
 309         struct ieee80211_radiotap_he_mu he_mu = {};
 310         struct ieee80211_radiotap_lsig lsig = {};
 311
 312         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 313                 he = *(struct ieee80211_radiotap_he *)skb->data;
 314                 skb_pull(skb, sizeof(he));
 315                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 316         }
 317
 318         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 319                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 320                 skb_pull(skb, sizeof(he_mu));
 321         }
 322
 323         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 324                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 325                 skb_pull(skb, sizeof(lsig));
 326         }
 327
 328         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 329                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 330                 /* rtap.len and rtap.pad are undone immediately */
 331                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 332         }
 333
 334         mpdulen = skb->len;
 335         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 336                 mpdulen += FCS_LEN;
 337
 338         rthdr = skb_push(skb, rtap_len);
 339         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 340         it_present = &rthdr->it_present;
 341
 342         /* radiotap header, set always present flags */
 343         rthdr->it_len = cpu_to_le16(rtap_len);
 344         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 345                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 346                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 347
 348         if (!status->chains)
 349                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 350
 351         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 352                 it_present_val |=
 353                         BIT(IEEE80211_RADIOTAP_EXT) |
 354                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 355                 put_unaligned_le32(it_present_val, it_present);
 356                 it_present++;
 357                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 358                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 359         }
 360
 361         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 362                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 363                                   BIT(IEEE80211_RADIOTAP_EXT);
 364                 put_unaligned_le32(it_present_val, it_present);
 365                 it_present++;
 366                 it_present_val = rtap.present;
 367         }
 368
 369         put_unaligned_le32(it_present_val, it_present);
 370
 371         pos = (void *)(it_present + 1);
 372
 373         /* the order of the following fields is important */
 374
 375         /* IEEE80211_RADIOTAP_TSFT */
 376         if (ieee80211_have_rx_timestamp(status)) {
 377                 /* padding */
 378                 while ((pos - (u8 *)rthdr) & 7)
 379                         *pos++ = 0;
 380                 put_unaligned_le64(
 381                         ieee80211_calculate_rx_timestamp(local, status,
 382                                                          mpdulen, 0),
 383                         pos);
 384                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 385                 pos += 8;
 386         }
 387
 388         /* IEEE80211_RADIOTAP_FLAGS */
 389         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 390                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 391         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 392                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 393         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 394                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 395         pos++;
 396
 397         /* IEEE80211_RADIOTAP_RATE */
 398         if (!rate || status->encoding != RX_ENC_LEGACY) {
 399                 /*
 400                  * Without rate information don't add it. If we have,
 401                  * MCS information is a separate field in radiotap,
 402                  * added below. The byte here is needed as padding
 403                  * for the channel though, so initialise it to 0.
 404                  */
 405                 *pos = 0;
 406         } else {
 407                 int shift = 0;
 408                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 409                 if (status->bw == RATE_INFO_BW_10)
 410                         shift = 1;
 411                 else if (status->bw == RATE_INFO_BW_5)
 412                         shift = 2;
 413                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 414         }
 415         pos++;
 416
 417         /* IEEE80211_RADIOTAP_CHANNEL */
 418         put_unaligned_le16(status->freq, pos);
 419         pos += 2;
 420         if (status->bw == RATE_INFO_BW_10)
 421                 channel_flags |= IEEE80211_CHAN_HALF;
 422         else if (status->bw == RATE_INFO_BW_5)
 423                 channel_flags |= IEEE80211_CHAN_QUARTER;
 424
 425         if (status->band == NL80211_BAND_5GHZ)
 426                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 427         else if (status->encoding != RX_ENC_LEGACY)
 428                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 429         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 430                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 431         else if (rate)
 432                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 433         else
 434                 channel_flags |= IEEE80211_CHAN_2GHZ;
 435         put_unaligned_le16(channel_flags, pos);
 436         pos += 2;
 437
 438         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 439         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 440             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 441                 *pos = status->signal;
 442                 rthdr->it_present |=
 443                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 444                 pos++;
 445         }
 446
 447         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 448
 449         if (!status->chains) {
 450                 /* IEEE80211_RADIOTAP_ANTENNA */
 451                 *pos = status->antenna;
 452                 pos++;
 453         }
 454
 455         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 456
 457         /* IEEE80211_RADIOTAP_RX_FLAGS */
 458         /* ensure 2 byte alignment for the 2 byte field as required */
 459         if ((pos - (u8 *)rthdr) & 1)
 460                 *pos++ = 0;
 461         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 462                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 463         put_unaligned_le16(rx_flags, pos);
 464         pos += 2;
 465
 466         if (status->encoding == RX_ENC_HT) {
 467                 unsigned int stbc;
 468
 469                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 470                 *pos++ = local->hw.radiotap_mcs_details;
 471                 *pos = 0;
 472                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 473                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 474                 if (status->bw == RATE_INFO_BW_40)
 475                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 476                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 477                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 478                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 479                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 480                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 481                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 482                 pos++;
 483                 *pos++ = status->rate_idx;
 484         }
 485
 486         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 487                 u16 flags = 0;
 488
 489                 /* ensure 4 byte alignment */
 490                 while ((pos - (u8 *)rthdr) & 3)
 491                         pos++;
 492                 rthdr->it_present |=
 493                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 494                 put_unaligned_le32(status->ampdu_reference, pos);
 495                 pos += 4;
 496                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 497                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 498                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 499                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 500                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 501                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 502                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 503                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 504                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 505                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 506                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 507                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 508                 put_unaligned_le16(flags, pos);
 509                 pos += 2;
 510                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 511                         *pos++ = status->ampdu_delimiter_crc;
 512                 else
 513                         *pos++ = 0;
 514                 *pos++ = 0;
 515         }
 516
 517         if (status->encoding == RX_ENC_VHT) {
 518                 u16 known = local->hw.radiotap_vht_details;
 519
 520                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 521                 put_unaligned_le16(known, pos);
 522                 pos += 2;
 523                 /* flags */
 524                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 526                 /* in VHT, STBC is binary */
 527                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 528                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 529                 if (status->enc_flags & RX_ENC_FLAG_BF)
 530                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 531                 pos++;
 532                 /* bandwidth */
 533                 switch (status->bw) {
 534                 case RATE_INFO_BW_80:
 535                         *pos++ = 4;
 536                         break;
 537                 case RATE_INFO_BW_160:
 538                         *pos++ = 11;
 539                         break;
 540                 case RATE_INFO_BW_40:
 541                         *pos++ = 1;
 542                         break;
 543                 default:
 544                         *pos++ = 0;
 545                 }
 546                 /* MCS/NSS */
 547                 *pos = (status->rate_idx << 4) | status->nss;
 548                 pos += 4;
 549                 /* coding field */
 550                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 551                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 552                 pos++;
 553                 /* group ID */
 554                 pos++;
 555                 /* partial_aid */
 556                 pos += 2;
 557         }
 558
 559         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 560                 u16 accuracy = 0;
 561                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 562
 563                 rthdr->it_present |=
 564                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 565
 566                 /* ensure 8 byte alignment */
 567                 while ((pos - (u8 *)rthdr) & 7)
 568                         pos++;
 569
 570                 put_unaligned_le64(status->device_timestamp, pos);
 571                 pos += sizeof(u64);
 572
 573                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 574                         accuracy = local->hw.radiotap_timestamp.accuracy;
 575                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 576                 }
 577                 put_unaligned_le16(accuracy, pos);
 578                 pos += sizeof(u16);
 579
 580                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 581                 *pos++ = flags;
 582         }
 583
 584         if (status->encoding == RX_ENC_HE &&
 585             status->flag & RX_FLAG_RADIOTAP_HE) {
 586 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 587
 588                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 589                         he.data6 |= HE_PREP(DATA6_NSTS,
 590                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 591                                                       status->enc_flags));
 592                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 593                 } else {
 594                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 595                 }
 596
 597 #define CHECK_GI(s) \
 598         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 599                      (int)NL80211_RATE_INFO_HE_GI_##s)
 600
 601                 CHECK_GI(0_8);
 602                 CHECK_GI(1_6);
 603                 CHECK_GI(3_2);
 604
 605                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 606                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 607                 he.data3 |= HE_PREP(DATA3_CODING,
 608                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 609
 610                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 611
 612                 switch (status->bw) {
 613                 case RATE_INFO_BW_20:
 614                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 615                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 616                         break;
 617                 case RATE_INFO_BW_40:
 618                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 619                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 620                         break;
 621                 case RATE_INFO_BW_80:
 622                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 623                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 624                         break;
 625                 case RATE_INFO_BW_160:
 626                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 627                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 628                         break;
 629                 case RATE_INFO_BW_HE_RU:
 630 #define CHECK_RU_ALLOC(s) \
 631         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 632                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 633
 634                         CHECK_RU_ALLOC(26);
 635                         CHECK_RU_ALLOC(52);
 636                         CHECK_RU_ALLOC(106);
 637                         CHECK_RU_ALLOC(242);
 638                         CHECK_RU_ALLOC(484);
 639                         CHECK_RU_ALLOC(996);
 640                         CHECK_RU_ALLOC(2x996);
 641
 642                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 643                                             status->he_ru + 4);
 644                         break;
 645                 default:
 646                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 647                 }
 648
 649                 /* ensure 2 byte alignment */
 650                 while ((pos - (u8 *)rthdr) & 1)
 651                         pos++;
 652                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 653                 memcpy(pos, &he, sizeof(he));
 654                 pos += sizeof(he);
 655         }
 656
 657         if (status->encoding == RX_ENC_HE &&
 658             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 659                 /* ensure 2 byte alignment */
 660                 while ((pos - (u8 *)rthdr) & 1)
 661                         pos++;
 662                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 663                 memcpy(pos, &he_mu, sizeof(he_mu));
 664                 pos += sizeof(he_mu);
 665         }
 666
 667         if (status->flag & RX_FLAG_NO_PSDU) {
 668                 rthdr->it_present |=
 669                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 670                 *pos++ = status->zero_length_psdu_type;
 671         }
 672
 673         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 674                 /* ensure 2 byte alignment */
 675                 while ((pos - (u8 *)rthdr) & 1)
 676                         pos++;
 677                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 678                 memcpy(pos, &lsig, sizeof(lsig));
 679                 pos += sizeof(lsig);
 680         }
 681
 682         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 683                 *pos++ = status->chain_signal[chain];
 684                 *pos++ = chain;
 685         }
 686
 687         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 688                 /* ensure 2 byte alignment for the vendor field as required */
 689                 if ((pos - (u8 *)rthdr) & 1)
 690                         *pos++ = 0;
 691                 *pos++ = rtap.oui[0];
 692                 *pos++ = rtap.oui[1];
 693                 *pos++ = rtap.oui[2];
 694                 *pos++ = rtap.subns;
 695                 put_unaligned_le16(rtap.len, pos);
 696                 pos += 2;
 697                 /* align the actual payload as requested */
 698                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 699                         *pos++ = 0;
 700                 /* data (and possible padding) already follows */
 701         }
 702 }
 703
 704 static struct sk_buff *
 705 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 706                            struct sk_buff **origskb,
 707                            struct ieee80211_rate *rate,
 708                            int rtap_space, bool use_origskb)
 709 {
 710         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 711         int rt_hdrlen, needed_headroom;
 712         struct sk_buff *skb;
 713
 714         /* room for the radiotap header based on driver features */
 715         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 716         needed_headroom = rt_hdrlen - rtap_space;
 717
 718         if (use_origskb) {
 719                 /* only need to expand headroom if necessary */
 720                 skb = *origskb;
 721                 *origskb = NULL;
 722
 723                 /*
 724                  * This shouldn't trigger often because most devices have an
 725                  * RX header they pull before we get here, and that should
 726                  * be big enough for our radiotap information. We should
 727                  * probably export the length to drivers so that we can have
 728                  * them allocate enough headroom to start with.
 729                  */
 730                 if (skb_headroom(skb) < needed_headroom &&
 731                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 732                         dev_kfree_skb(skb);
 733                         return NULL;
 734                 }
 735         } else {
 736                 /*
 737                  * Need to make a copy and possibly remove radiotap header
 738                  * and FCS from the original.
 739                  */
 740                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 741
 742                 if (!skb)
 743                         return NULL;
 744         }
 745
 746         /* prepend radiotap information */
 747         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 748
 749         skb_reset_mac_header(skb);
 750         skb->ip_summed = CHECKSUM_UNNECESSARY;
 751         skb->pkt_type = PACKET_OTHERHOST;
 752         skb->protocol = htons(ETH_P_802_2);
 753
 754         return skb;
 755 }
 756
 757 /*
 758  * This function copies a received frame to all monitor interfaces and
 759  * returns a cleaned-up SKB that no longer includes the FCS nor the
 760  * radiotap header the driver might have added.
 761  */
 762 static struct sk_buff *
 763 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 764                      struct ieee80211_rate *rate)
 765 {
 766         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 767         struct ieee80211_sub_if_data *sdata;
 768         struct sk_buff *monskb = NULL;
 769         int present_fcs_len = 0;
 770         unsigned int rtap_space = 0;
 771         struct ieee80211_sub_if_data *monitor_sdata =
 772                 rcu_dereference(local->monitor_sdata);
 773         bool only_monitor = false;
 774         unsigned int min_head_len;
 775
 776         if (status->flag & RX_FLAG_RADIOTAP_HE)
 777                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 778
 779         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 780                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 781
 782         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 783                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 784
 785         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 786                 struct ieee80211_vendor_radiotap *rtap =
 787                         (void *)(origskb->data + rtap_space);
 788
 789                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 790         }
 791
 792         min_head_len = rtap_space;
 793
 794         /*
 795          * First, we may need to make a copy of the skb because
 796          *  (1) we need to modify it for radiotap (if not present), and
 797          *  (2) the other RX handlers will modify the skb we got.
 798          *
 799          * We don't need to, of course, if we aren't going to return
 800          * the SKB because it has a bad FCS/PLCP checksum.
 801          */
 802
 803         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 804                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 805                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 806                                 /* driver bug */
 807                                 WARN_ON(1);
 808                                 dev_kfree_skb(origskb);
 809                                 return NULL;
 810                         }
 811                         present_fcs_len = FCS_LEN;
 812                 }
 813
 814                 /* also consider the hdr->frame_control */
 815                 min_head_len += 2;
 816         }
 817
 818         /* ensure that the expected data elements are in skb head */
 819         if (!pskb_may_pull(origskb, min_head_len)) {
 820                 dev_kfree_skb(origskb);
 821                 return NULL;
 822         }
 823
 824         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 825
 826         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 827                 if (only_monitor) {
 828                         dev_kfree_skb(origskb);
 829                         return NULL;
 830                 }
 831
 832                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 833                 return origskb;
 834         }
 835
 836         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 837
 838         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 839                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 840                                                  &local->mon_list);
 841
 842                 if (!monskb)
 843                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 844                                                             rate, rtap_space,
 845                                                             only_monitor &&
 846                                                             last_monitor);
 847
 848                 if (monskb) {
 849                         struct sk_buff *skb;
 850
 851                         if (last_monitor) {
 852                                 skb = monskb;
 853                                 monskb = NULL;
 854                         } else {
 855                                 skb = skb_clone(monskb, GFP_ATOMIC);
 856                         }
 857
 858                         if (skb) {
 859                                 skb->dev = sdata->dev;
 860                                 ieee80211_rx_stats(skb->dev, skb->len);
 861                                 netif_receive_skb(skb);
 862                         }
 863                 }
 864
 865                 if (last_monitor)
 866                         break;
 867         }
 868
 869         /* this happens if last_monitor was erroneously false */
 870         dev_kfree_skb(monskb);
 871
 872         /* ditto */
 873         if (!origskb)
 874                 return NULL;
 875
 876         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 877         return origskb;
 878 }
 879
 880 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 881 {
 882         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 883         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 884         int tid, seqno_idx, security_idx;
 885
 886         /* does the frame have a qos control field? */
 887         if (ieee80211_is_data_qos(hdr->frame_control)) {
 888                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 889                 /* frame has qos control */
 890                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 891                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 892                         status->rx_flags |= IEEE80211_RX_AMSDU;
 893
 894                 seqno_idx = tid;
 895                 security_idx = tid;
 896         } else {
 897                 /*
 898                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 899                  *
 900                  *      Sequence numbers for management frames, QoS data
 901                  *      frames with a broadcast/multicast address in the
 902                  *      Address 1 field, and all non-QoS data frames sent
 903                  *      by QoS STAs are assigned using an additional single
 904                  *      modulo-4096 counter, [...]
 905                  *
 906                  * We also use that counter for non-QoS STAs.
 907                  */
 908                 seqno_idx = IEEE80211_NUM_TIDS;
 909                 security_idx = 0;
 910                 if (ieee80211_is_mgmt(hdr->frame_control))
 911                         security_idx = IEEE80211_NUM_TIDS;
 912                 tid = 0;
 913         }
 914
 915         rx->seqno_idx = seqno_idx;
 916         rx->security_idx = security_idx;
 917         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 918          * For now, set skb->priority to 0 for other cases. */
 919         rx->skb->priority = (tid > 7) ? 0 : tid;
 920 }
 921
 922 /**
 923  * DOC: Packet alignment
 924  *
 925  * Drivers always need to pass packets that are aligned to two-byte boundaries
 926  * to the stack.
 927  *
 928  * Additionally, should, if possible, align the payload data in a way that
 929  * guarantees that the contained IP header is aligned to a four-byte
 930  * boundary. In the case of regular frames, this simply means aligning the
 931  * payload to a four-byte boundary (because either the IP header is directly
 932  * contained, or IV/RFC1042 headers that have a length divisible by four are
 933  * in front of it).  If the payload data is not properly aligned and the
 934  * architecture doesn't support efficient unaligned operations, mac80211
 935  * will align the data.
 936  *
 937  * With A-MSDU frames, however, the payload data address must yield two modulo
 938  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 939  * push the IP header further back to a multiple of four again. Thankfully, the
 940  * specs were sane enough this time around to require padding each A-MSDU
 941  * subframe to a length that is a multiple of four.
 942  *
 943  * Padding like Atheros hardware adds which is between the 802.11 header and
 944  * the payload is not supported, the driver is required to move the 802.11
 945  * header to be directly in front of the payload in that case.
 946  */
 947 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 948 {
 949 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 950         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 951 #endif
 952 }
 953
 954
 955 /* rx handlers */
 956
 957 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 958 {
 959         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 960
 961         if (is_multicast_ether_addr(hdr->addr1))
 962                 return 0;
 963
 964         return ieee80211_is_robust_mgmt_frame(skb);
 965 }
 966
 967
 968 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 969 {
 970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 971
 972         if (!is_multicast_ether_addr(hdr->addr1))
 973                 return 0;
 974
 975         return ieee80211_is_robust_mgmt_frame(skb);
 976 }
 977
 978
 979 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 980 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 981 {
 982         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 983         struct ieee80211_mmie *mmie;
 984         struct ieee80211_mmie_16 *mmie16;
 985
 986         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 987                 return -1;
 988
 989         if (!ieee80211_is_robust_mgmt_frame(skb))
 990                 return -1; /* not a robust management frame */
 991
 992         mmie = (struct ieee80211_mmie *)
 993                 (skb->data + skb->len - sizeof(*mmie));
 994         if (mmie->element_id == WLAN_EID_MMIE &&
 995             mmie->length == sizeof(*mmie) - 2)
 996                 return le16_to_cpu(mmie->key_id);
 997
 998         mmie16 = (struct ieee80211_mmie_16 *)
 999                 (skb->data + skb->len - sizeof(*mmie16));
1000         if (skb->len >= 24 + sizeof(*mmie16) &&
1001             mmie16->element_id == WLAN_EID_MMIE &&
1002             mmie16->length == sizeof(*mmie16) - 2)
1003                 return le16_to_cpu(mmie16->key_id);
1004
1005         return -1;
1006 }
1007
1008 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
1009                                   struct sk_buff *skb)
1010 {
1011         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1012         __le16 fc;
1013         int hdrlen;
1014         u8 keyid;
1015
1016         fc = hdr->frame_control;
1017         hdrlen = ieee80211_hdrlen(fc);
1018
1019         if (skb->len < hdrlen + cs->hdr_len)
1020                 return -EINVAL;
1021
1022         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
1023         keyid &= cs->key_idx_mask;
1024         keyid >>= cs->key_idx_shift;
1025
1026         return keyid;
1027 }
1028
1029 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1030 {
1031         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1032         char *dev_addr = rx->sdata->vif.addr;
1033
1034         if (ieee80211_is_data(hdr->frame_control)) {
1035                 if (is_multicast_ether_addr(hdr->addr1)) {
1036                         if (ieee80211_has_tods(hdr->frame_control) ||
1037                             !ieee80211_has_fromds(hdr->frame_control))
1038                                 return RX_DROP_MONITOR;
1039                         if (ether_addr_equal(hdr->addr3, dev_addr))
1040                                 return RX_DROP_MONITOR;
1041                 } else {
1042                         if (!ieee80211_has_a4(hdr->frame_control))
1043                                 return RX_DROP_MONITOR;
1044                         if (ether_addr_equal(hdr->addr4, dev_addr))
1045                                 return RX_DROP_MONITOR;
1046                 }
1047         }
1048
1049         /* If there is not an established peer link and this is not a peer link
1050          * establisment frame, beacon or probe, drop the frame.
1051          */
1052
1053         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1054                 struct ieee80211_mgmt *mgmt;
1055
1056                 if (!ieee80211_is_mgmt(hdr->frame_control))
1057                         return RX_DROP_MONITOR;
1058
1059                 if (ieee80211_is_action(hdr->frame_control)) {
1060                         u8 category;
1061
1062                         /* make sure category field is present */
1063                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1064                                 return RX_DROP_MONITOR;
1065
1066                         mgmt = (struct ieee80211_mgmt *)hdr;
1067                         category = mgmt->u.action.category;
1068                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1069                             category != WLAN_CATEGORY_SELF_PROTECTED)
1070                                 return RX_DROP_MONITOR;
1071                         return RX_CONTINUE;
1072                 }
1073
1074                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1075                     ieee80211_is_probe_resp(hdr->frame_control) ||
1076                     ieee80211_is_beacon(hdr->frame_control) ||
1077                     ieee80211_is_auth(hdr->frame_control))
1078                         return RX_CONTINUE;
1079
1080                 return RX_DROP_MONITOR;
1081         }
1082
1083         return RX_CONTINUE;
1084 }
1085
1086 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1087                                               int index)
1088 {
1089         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1090         struct sk_buff *tail = skb_peek_tail(frames);
1091         struct ieee80211_rx_status *status;
1092
1093         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1094                 return true;
1095
1096         if (!tail)
1097                 return false;
1098
1099         status = IEEE80211_SKB_RXCB(tail);
1100         if (status->flag & RX_FLAG_AMSDU_MORE)
1101                 return false;
1102
1103         return true;
1104 }
1105
1106 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1107                                             struct tid_ampdu_rx *tid_agg_rx,
1108                                             int index,
1109                                             struct sk_buff_head *frames)
1110 {
1111         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1112         struct sk_buff *skb;
1113         struct ieee80211_rx_status *status;
1114
1115         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1116
1117         if (skb_queue_empty(skb_list))
1118                 goto no_frame;
1119
1120         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1121                 __skb_queue_purge(skb_list);
1122                 goto no_frame;
1123         }
1124
1125         /* release frames from the reorder ring buffer */
1126         tid_agg_rx->stored_mpdu_num--;
1127         while ((skb = __skb_dequeue(skb_list))) {
1128                 status = IEEE80211_SKB_RXCB(skb);
1129                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1130                 __skb_queue_tail(frames, skb);
1131         }
1132
1133 no_frame:
1134         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1135         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1136 }
1137
1138 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1139                                              struct tid_ampdu_rx *tid_agg_rx,
1140                                              u16 head_seq_num,
1141                                              struct sk_buff_head *frames)
1142 {
1143         int index;
1144
1145         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1146
1147         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1148                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1149                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1150                                                 frames);
1151         }
1152 }
1153
1154 /*
1155  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1156  * the skb was added to the buffer longer than this time ago, the earlier
1157  * frames that have not yet been received are assumed to be lost and the skb
1158  * can be released for processing. This may also release other skb's from the
1159  * reorder buffer if there are no additional gaps between the frames.
1160  *
1161  * Callers must hold tid_agg_rx->reorder_lock.
1162  */
1163 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1164
1165 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1166                                           struct tid_ampdu_rx *tid_agg_rx,
1167                                           struct sk_buff_head *frames)
1168 {
1169         int index, i, j;
1170
1171         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1172
1173         /* release the buffer until next missing frame */
1174         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1175         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1176             tid_agg_rx->stored_mpdu_num) {
1177                 /*
1178                  * No buffers ready to be released, but check whether any
1179                  * frames in the reorder buffer have timed out.
1180                  */
1181                 int skipped = 1;
1182                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1183                      j = (j + 1) % tid_agg_rx->buf_size) {
1184                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1185                                 skipped++;
1186                                 continue;
1187                         }
1188                         if (skipped &&
1189                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1190                                         HT_RX_REORDER_BUF_TIMEOUT))
1191                                 goto set_release_timer;
1192
1193                         /* don't leave incomplete A-MSDUs around */
1194                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1195                              i = (i + 1) % tid_agg_rx->buf_size)
1196                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1197
1198                         ht_dbg_ratelimited(sdata,
1199                                            "release an RX reorder frame due to timeout on earlier frames\n");
1200                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1201                                                         frames);
1202
1203                         /*
1204                          * Increment the head seq# also for the skipped slots.
1205                          */
1206                         tid_agg_rx->head_seq_num =
1207                                 (tid_agg_rx->head_seq_num +
1208                                  skipped) & IEEE80211_SN_MASK;
1209                         skipped = 0;
1210                 }
1211         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1212                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1213                                                 frames);
1214                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1215         }
1216
1217         if (tid_agg_rx->stored_mpdu_num) {
1218                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1219
1220                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1221                      j = (j + 1) % tid_agg_rx->buf_size) {
1222                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1223                                 break;
1224                 }
1225
1226  set_release_timer:
1227
1228                 if (!tid_agg_rx->removed)
1229                         mod_timer(&tid_agg_rx->reorder_timer,
1230                                   tid_agg_rx->reorder_time[j] + 1 +
1231                                   HT_RX_REORDER_BUF_TIMEOUT);
1232         } else {
1233                 del_timer(&tid_agg_rx->reorder_timer);
1234         }
1235 }
1236
1237 /*
1238  * As this function belongs to the RX path it must be under
1239  * rcu_read_lock protection. It returns false if the frame
1240  * can be processed immediately, true if it was consumed.
1241  */
1242 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1243                                              struct tid_ampdu_rx *tid_agg_rx,
1244                                              struct sk_buff *skb,
1245                                              struct sk_buff_head *frames)
1246 {
1247         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1248         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1249         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1250         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1251         u16 head_seq_num, buf_size;
1252         int index;
1253         bool ret = true;
1254
1255         spin_lock(&tid_agg_rx->reorder_lock);
1256
1257         /*
1258          * Offloaded BA sessions have no known starting sequence number so pick
1259          * one from first Rxed frame for this tid after BA was started.
1260          */
1261         if (unlikely(tid_agg_rx->auto_seq)) {
1262                 tid_agg_rx->auto_seq = false;
1263                 tid_agg_rx->ssn = mpdu_seq_num;
1264                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1265         }
1266
1267         buf_size = tid_agg_rx->buf_size;
1268         head_seq_num = tid_agg_rx->head_seq_num;
1269
1270         /*
1271          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1272          * be reordered.
1273          */
1274         if (unlikely(!tid_agg_rx->started)) {
1275                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1276                         ret = false;
1277                         goto out;
1278                 }
1279                 tid_agg_rx->started = true;
1280         }
1281
1282         /* frame with out of date sequence number */
1283         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1284                 dev_kfree_skb(skb);
1285                 goto out;
1286         }
1287
1288         /*
1289          * If frame the sequence number exceeds our buffering window
1290          * size release some previous frames to make room for this one.
1291          */
1292         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1293                 head_seq_num = ieee80211_sn_inc(
1294                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1295                 /* release stored frames up to new head to stack */
1296                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1297                                                  head_seq_num, frames);
1298         }
1299
1300         /* Now the new frame is always in the range of the reordering buffer */
1301
1302         index = mpdu_seq_num % tid_agg_rx->buf_size;
1303
1304         /* check if we already stored this frame */
1305         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1306                 dev_kfree_skb(skb);
1307                 goto out;
1308         }
1309
1310         /*
1311          * If the current MPDU is in the right order and nothing else
1312          * is stored we can process it directly, no need to buffer it.
1313          * If it is first but there's something stored, we may be able
1314          * to release frames after this one.
1315          */
1316         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1317             tid_agg_rx->stored_mpdu_num == 0) {
1318                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1319                         tid_agg_rx->head_seq_num =
1320                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1321                 ret = false;
1322                 goto out;
1323         }
1324
1325         /* put the frame in the reordering buffer */
1326         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1327         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1328                 tid_agg_rx->reorder_time[index] = jiffies;
1329                 tid_agg_rx->stored_mpdu_num++;
1330                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1331         }
1332
1333  out:
1334         spin_unlock(&tid_agg_rx->reorder_lock);
1335         return ret;
1336 }
1337
1338 /*
1339  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1340  * true if the MPDU was buffered, false if it should be processed.
1341  */
1342 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1343                                        struct sk_buff_head *frames)
1344 {
1345         struct sk_buff *skb = rx->skb;
1346         struct ieee80211_local *local = rx->local;
1347         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1348         struct sta_info *sta = rx->sta;
1349         struct tid_ampdu_rx *tid_agg_rx;
1350         u16 sc;
1351         u8 tid, ack_policy;
1352
1353         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1354             is_multicast_ether_addr(hdr->addr1))
1355                 goto dont_reorder;
1356
1357         /*
1358          * filter the QoS data rx stream according to
1359          * STA/TID and check if this STA/TID is on aggregation
1360          */
1361
1362         if (!sta)
1363                 goto dont_reorder;
1364
1365         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1366                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1367         tid = ieee80211_get_tid(hdr);
1368
1369         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1370         if (!tid_agg_rx) {
1371                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1372                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1373                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1374                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1375                                              WLAN_BACK_RECIPIENT,
1376                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1377                 goto dont_reorder;
1378         }
1379
1380         /* qos null data frames are excluded */
1381         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1382                 goto dont_reorder;
1383
1384         /* not part of a BA session */
1385         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1386             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1387                 goto dont_reorder;
1388
1389         /* new, potentially un-ordered, ampdu frame - process it */
1390
1391         /* reset session timer */
1392         if (tid_agg_rx->timeout)
1393                 tid_agg_rx->last_rx = jiffies;
1394
1395         /* if this mpdu is fragmented - terminate rx aggregation session */
1396         sc = le16_to_cpu(hdr->seq_ctrl);
1397         if (sc & IEEE80211_SCTL_FRAG) {
1398                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1399                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1400                 return;
1401         }
1402
1403         /*
1404          * No locking needed -- we will only ever process one
1405          * RX packet at a time, and thus own tid_agg_rx. All
1406          * other code manipulating it needs to (and does) make
1407          * sure that we cannot get to it any more before doing
1408          * anything with it.
1409          */
1410         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1411                                              frames))
1412                 return;
1413
1414  dont_reorder:
1415         __skb_queue_tail(frames, skb);
1416 }
1417
1418 static ieee80211_rx_result debug_noinline
1419 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1420 {
1421         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1422         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1423
1424         if (status->flag & RX_FLAG_DUP_VALIDATED)
1425                 return RX_CONTINUE;
1426
1427         /*
1428          * Drop duplicate 802.11 retransmissions
1429          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1430          */
1431
1432         if (rx->skb->len < 24)
1433                 return RX_CONTINUE;
1434
1435         if (ieee80211_is_ctl(hdr->frame_control) ||
1436             ieee80211_is_nullfunc(hdr->frame_control) ||
1437             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1438             is_multicast_ether_addr(hdr->addr1))
1439                 return RX_CONTINUE;
1440
1441         if (!rx->sta)
1442                 return RX_CONTINUE;
1443
1444         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1445                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1446                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1447                 rx->sta->rx_stats.num_duplicates++;
1448                 return RX_DROP_UNUSABLE;
1449         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1450                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1451         }
1452
1453         return RX_CONTINUE;
1454 }
1455
1456 static ieee80211_rx_result debug_noinline
1457 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1458 {
1459         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1460
1461         /* Drop disallowed frame classes based on STA auth/assoc state;
1462          * IEEE 802.11, Chap 5.5.
1463          *
1464          * mac80211 filters only based on association state, i.e. it drops
1465          * Class 3 frames from not associated stations. hostapd sends
1466          * deauth/disassoc frames when needed. In addition, hostapd is
1467          * responsible for filtering on both auth and assoc states.
1468          */
1469
1470         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1471                 return ieee80211_rx_mesh_check(rx);
1472
1473         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1474                       ieee80211_is_pspoll(hdr->frame_control)) &&
1475                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1476                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1477                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1478                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1479                 /*
1480                  * accept port control frames from the AP even when it's not
1481                  * yet marked ASSOC to prevent a race where we don't set the
1482                  * assoc bit quickly enough before it sends the first frame
1483                  */
1484                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1485                     ieee80211_is_data_present(hdr->frame_control)) {
1486                         unsigned int hdrlen;
1487                         __be16 ethertype;
1488
1489                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1490
1491                         if (rx->skb->len < hdrlen + 8)
1492                                 return RX_DROP_MONITOR;
1493
1494                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1495                         if (ethertype == rx->sdata->control_port_protocol)
1496                                 return RX_CONTINUE;
1497                 }
1498
1499                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1500                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1501                                                hdr->addr2,
1502                                                GFP_ATOMIC))
1503                         return RX_DROP_UNUSABLE;
1504
1505                 return RX_DROP_MONITOR;
1506         }
1507
1508         return RX_CONTINUE;
1509 }
1510
1511
1512 static ieee80211_rx_result debug_noinline
1513 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1514 {
1515         struct ieee80211_local *local;
1516         struct ieee80211_hdr *hdr;
1517         struct sk_buff *skb;
1518
1519         local = rx->local;
1520         skb = rx->skb;
1521         hdr = (struct ieee80211_hdr *) skb->data;
1522
1523         if (!local->pspolling)
1524                 return RX_CONTINUE;
1525
1526         if (!ieee80211_has_fromds(hdr->frame_control))
1527                 /* this is not from AP */
1528                 return RX_CONTINUE;
1529
1530         if (!ieee80211_is_data(hdr->frame_control))
1531                 return RX_CONTINUE;
1532
1533         if (!ieee80211_has_moredata(hdr->frame_control)) {
1534                 /* AP has no more frames buffered for us */
1535                 local->pspolling = false;
1536                 return RX_CONTINUE;
1537         }
1538
1539         /* more data bit is set, let's request a new frame from the AP */
1540         ieee80211_send_pspoll(local, rx->sdata);
1541
1542         return RX_CONTINUE;
1543 }
1544
1545 static void sta_ps_start(struct sta_info *sta)
1546 {
1547         struct ieee80211_sub_if_data *sdata = sta->sdata;
1548         struct ieee80211_local *local = sdata->local;
1549         struct ps_data *ps;
1550         int tid;
1551
1552         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1553             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1554                 ps = &sdata->bss->ps;
1555         else
1556                 return;
1557
1558         atomic_inc(&ps->num_sta_ps);
1559         set_sta_flag(sta, WLAN_STA_PS_STA);
1560         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1561                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1562         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1563                sta->sta.addr, sta->sta.aid);
1564
1565         ieee80211_clear_fast_xmit(sta);
1566
1567         if (!sta->sta.txq[0])
1568                 return;
1569
1570         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1571                 if (txq_has_queue(sta->sta.txq[tid]))
1572                         set_bit(tid, &sta->txq_buffered_tids);
1573                 else
1574                         clear_bit(tid, &sta->txq_buffered_tids);
1575         }
1576 }
1577
1578 static void sta_ps_end(struct sta_info *sta)
1579 {
1580         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1581                sta->sta.addr, sta->sta.aid);
1582
1583         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1584                 /*
1585                  * Clear the flag only if the other one is still set
1586                  * so that the TX path won't start TX'ing new frames
1587                  * directly ... In the case that the driver flag isn't
1588                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1589                  */
1590                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1591                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1592                        sta->sta.addr, sta->sta.aid);
1593                 return;
1594         }
1595
1596         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1597         clear_sta_flag(sta, WLAN_STA_PS_STA);
1598         ieee80211_sta_ps_deliver_wakeup(sta);
1599 }
1600
1601 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1602 {
1603         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1604         bool in_ps;
1605
1606         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1607
1608         /* Don't let the same PS state be set twice */
1609         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1610         if ((start && in_ps) || (!start && !in_ps))
1611                 return -EINVAL;
1612
1613         if (start)
1614                 sta_ps_start(sta);
1615         else
1616                 sta_ps_end(sta);
1617
1618         return 0;
1619 }
1620 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1621
1622 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1623 {
1624         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1625
1626         if (test_sta_flag(sta, WLAN_STA_SP))
1627                 return;
1628
1629         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1630                 ieee80211_sta_ps_deliver_poll_response(sta);
1631         else
1632                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1633 }
1634 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1635
1636 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1637 {
1638         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1639         int ac = ieee80211_ac_from_tid(tid);
1640
1641         /*
1642          * If this AC is not trigger-enabled do nothing unless the
1643          * driver is calling us after it already checked.
1644          *
1645          * NB: This could/should check a separate bitmap of trigger-
1646          * enabled queues, but for now we only implement uAPSD w/o
1647          * TSPEC changes to the ACs, so they're always the same.
1648          */
1649         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1650             tid != IEEE80211_NUM_TIDS)
1651                 return;
1652
1653         /* if we are in a service period, do nothing */
1654         if (test_sta_flag(sta, WLAN_STA_SP))
1655                 return;
1656
1657         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1658                 ieee80211_sta_ps_deliver_uapsd(sta);
1659         else
1660                 set_sta_flag(sta, WLAN_STA_UAPSD);
1661 }
1662 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1663
1664 static ieee80211_rx_result debug_noinline
1665 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1666 {
1667         struct ieee80211_sub_if_data *sdata = rx->sdata;
1668         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1669         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1670
1671         if (!rx->sta)
1672                 return RX_CONTINUE;
1673
1674         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1675             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1676                 return RX_CONTINUE;
1677
1678         /*
1679          * The device handles station powersave, so don't do anything about
1680          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1681          * it to mac80211 since they're handled.)
1682          */
1683         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1684                 return RX_CONTINUE;
1685
1686         /*
1687          * Don't do anything if the station isn't already asleep. In
1688          * the uAPSD case, the station will probably be marked asleep,
1689          * in the PS-Poll case the station must be confused ...
1690          */
1691         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1692                 return RX_CONTINUE;
1693
1694         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1695                 ieee80211_sta_pspoll(&rx->sta->sta);
1696
1697                 /* Free PS Poll skb here instead of returning RX_DROP that would
1698                  * count as an dropped frame. */
1699                 dev_kfree_skb(rx->skb);
1700
1701                 return RX_QUEUED;
1702         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1703                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1704                    ieee80211_has_pm(hdr->frame_control) &&
1705                    (ieee80211_is_data_qos(hdr->frame_control) ||
1706                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1707                 u8 tid = ieee80211_get_tid(hdr);
1708
1709                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1710         }
1711
1712         return RX_CONTINUE;
1713 }
1714
1715 static ieee80211_rx_result debug_noinline
1716 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1717 {
1718         struct sta_info *sta = rx->sta;
1719         struct sk_buff *skb = rx->skb;
1720         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1721         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1722         int i;
1723
1724         if (!sta)
1725                 return RX_CONTINUE;
1726
1727         /*
1728          * Update last_rx only for IBSS packets which are for the current
1729          * BSSID and for station already AUTHORIZED to avoid keeping the
1730          * current IBSS network alive in cases where other STAs start
1731          * using different BSSID. This will also give the station another
1732          * chance to restart the authentication/authorization in case
1733          * something went wrong the first time.
1734          */
1735         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1736                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1737                                                 NL80211_IFTYPE_ADHOC);
1738                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1739                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1740                         sta->rx_stats.last_rx = jiffies;
1741                         if (ieee80211_is_data(hdr->frame_control) &&
1742                             !is_multicast_ether_addr(hdr->addr1))
1743                                 sta->rx_stats.last_rate =
1744                                         sta_stats_encode_rate(status);
1745                 }
1746         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1747                 sta->rx_stats.last_rx = jiffies;
1748         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1749                 /*
1750                  * Mesh beacons will update last_rx when if they are found to
1751                  * match the current local configuration when processed.
1752                  */
1753                 sta->rx_stats.last_rx = jiffies;
1754                 if (ieee80211_is_data(hdr->frame_control))
1755                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1756         }
1757
1758         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1759                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1760
1761         sta->rx_stats.fragments++;
1762
1763         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1764         sta->rx_stats.bytes += rx->skb->len;
1765         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1766
1767         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1768                 sta->rx_stats.last_signal = status->signal;
1769                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1770         }
1771
1772         if (status->chains) {
1773                 sta->rx_stats.chains = status->chains;
1774                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1775                         int signal = status->chain_signal[i];
1776
1777                         if (!(status->chains & BIT(i)))
1778                                 continue;
1779
1780                         sta->rx_stats.chain_signal_last[i] = signal;
1781                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1782                                         -signal);
1783                 }
1784         }
1785
1786         /*
1787          * Change STA power saving mode only at the end of a frame
1788          * exchange sequence, and only for a data or management
1789          * frame as specified in IEEE 802.11-2016 11.2.3.2
1790          */
1791         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1792             !ieee80211_has_morefrags(hdr->frame_control) &&
1793             !is_multicast_ether_addr(hdr->addr1) &&
1794             (ieee80211_is_mgmt(hdr->frame_control) ||
1795              ieee80211_is_data(hdr->frame_control)) &&
1796             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1797             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1798              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1799                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1800                         if (!ieee80211_has_pm(hdr->frame_control))
1801                                 sta_ps_end(sta);
1802                 } else {
1803                         if (ieee80211_has_pm(hdr->frame_control))
1804                                 sta_ps_start(sta);
1805                 }
1806         }
1807
1808         /* mesh power save support */
1809         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1810                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1811
1812         /*
1813          * Drop (qos-)data::nullfunc frames silently, since they
1814          * are used only to control station power saving mode.
1815          */
1816         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1817             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1818                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1819
1820                 /*
1821                  * If we receive a 4-addr nullfunc frame from a STA
1822                  * that was not moved to a 4-addr STA vlan yet send
1823                  * the event to userspace and for older hostapd drop
1824                  * the frame to the monitor interface.
1825                  */
1826                 if (ieee80211_has_a4(hdr->frame_control) &&
1827                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1828                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1829                       !rx->sdata->u.vlan.sta))) {
1830                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1831                                 cfg80211_rx_unexpected_4addr_frame(
1832                                         rx->sdata->dev, sta->sta.addr,
1833                                         GFP_ATOMIC);
1834                         return RX_DROP_MONITOR;
1835                 }
1836                 /*
1837                  * Update counter and free packet here to avoid
1838                  * counting this as a dropped packed.
1839                  */
1840                 sta->rx_stats.packets++;
1841                 dev_kfree_skb(rx->skb);
1842                 return RX_QUEUED;
1843         }
1844
1845         return RX_CONTINUE;
1846 } /* ieee80211_rx_h_sta_process */
1847
1848 static ieee80211_rx_result debug_noinline
1849 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1850 {
1851         struct sk_buff *skb = rx->skb;
1852         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1853         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1854         int keyidx;
1855         int hdrlen;
1856         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1857         struct ieee80211_key *sta_ptk = NULL;
1858         int mmie_keyidx = -1;
1859         __le16 fc;
1860         const struct ieee80211_cipher_scheme *cs = NULL;
1861
1862         /*
1863          * Key selection 101
1864          *
1865          * There are four types of keys:
1866          *  - GTK (group keys)
1867          *  - IGTK (group keys for management frames)
1868          *  - PTK (pairwise keys)
1869          *  - STK (station-to-station pairwise keys)
1870          *
1871          * When selecting a key, we have to distinguish between multicast
1872          * (including broadcast) and unicast frames, the latter can only
1873          * use PTKs and STKs while the former always use GTKs and IGTKs.
1874          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1875          * unicast frames can also use key indices like GTKs. Hence, if we
1876          * don't have a PTK/STK we check the key index for a WEP key.
1877          *
1878          * Note that in a regular BSS, multicast frames are sent by the
1879          * AP only, associated stations unicast the frame to the AP first
1880          * which then multicasts it on their behalf.
1881          *
1882          * There is also a slight problem in IBSS mode: GTKs are negotiated
1883          * with each station, that is something we don't currently handle.
1884          * The spec seems to expect that one negotiates the same key with
1885          * every station but there's no such requirement; VLANs could be
1886          * possible.
1887          */
1888
1889         /* start without a key */
1890         rx->key = NULL;
1891         fc = hdr->frame_control;
1892
1893         if (rx->sta) {
1894                 int keyid = rx->sta->ptk_idx;
1895
1896                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1897                         cs = rx->sta->cipher_scheme;
1898                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1899                         if (unlikely(keyid < 0))
1900                                 return RX_DROP_UNUSABLE;
1901                 }
1902                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1903         }
1904
1905         if (!ieee80211_has_protected(fc))
1906                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1907
1908         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1909                 rx->key = sta_ptk;
1910                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1911                     (status->flag & RX_FLAG_IV_STRIPPED))
1912                         return RX_CONTINUE;
1913                 /* Skip decryption if the frame is not protected. */
1914                 if (!ieee80211_has_protected(fc))
1915                         return RX_CONTINUE;
1916         } else if (mmie_keyidx >= 0) {
1917                 /* Broadcast/multicast robust management frame / BIP */
1918                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1919                     (status->flag & RX_FLAG_IV_STRIPPED))
1920                         return RX_CONTINUE;
1921
1922                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1923                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1924                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1925                 if (rx->sta) {
1926                         if (ieee80211_is_group_privacy_action(skb) &&
1927                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1928                                 return RX_DROP_MONITOR;
1929
1930                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1931                 }
1932                 if (!rx->key)
1933                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1934         } else if (!ieee80211_has_protected(fc)) {
1935                 /*
1936                  * The frame was not protected, so skip decryption. However, we
1937                  * need to set rx->key if there is a key that could have been
1938                  * used so that the frame may be dropped if encryption would
1939                  * have been expected.
1940                  */
1941                 struct ieee80211_key *key = NULL;
1942                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1943                 int i;
1944
1945                 if (ieee80211_is_mgmt(fc) &&
1946                     is_multicast_ether_addr(hdr->addr1) &&
1947                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1948                         rx->key = key;
1949                 else {
1950                         if (rx->sta) {
1951                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1952                                         key = rcu_dereference(rx->sta->gtk[i]);
1953                                         if (key)
1954                                                 break;
1955                                 }
1956                         }
1957                         if (!key) {
1958                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1959                                         key = rcu_dereference(sdata->keys[i]);
1960                                         if (key)
1961                                                 break;
1962                                 }
1963                         }
1964                         if (key)
1965                                 rx->key = key;
1966                 }
1967                 return RX_CONTINUE;
1968         } else {
1969                 u8 keyid;
1970
1971                 /*
1972                  * The device doesn't give us the IV so we won't be
1973                  * able to look up the key. That's ok though, we
1974                  * don't need to decrypt the frame, we just won't
1975                  * be able to keep statistics accurate.
1976                  * Except for key threshold notifications, should
1977                  * we somehow allow the driver to tell us which key
1978                  * the hardware used if this flag is set?
1979                  */
1980                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1981                     (status->flag & RX_FLAG_IV_STRIPPED))
1982                         return RX_CONTINUE;
1983
1984                 hdrlen = ieee80211_hdrlen(fc);
1985
1986                 if (cs) {
1987                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1988
1989                         if (unlikely(keyidx < 0))
1990                                 return RX_DROP_UNUSABLE;
1991                 } else {
1992                         if (rx->skb->len < 8 + hdrlen)
1993                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1994                         /*
1995                          * no need to call ieee80211_wep_get_keyidx,
1996                          * it verifies a bunch of things we've done already
1997                          */
1998                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1999                         keyidx = keyid >> 6;
2000                 }
2001
2002                 /* check per-station GTK first, if multicast packet */
2003                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2004                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2005
2006                 /* if not found, try default key */
2007                 if (!rx->key) {
2008                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2009
2010                         /*
2011                          * RSNA-protected unicast frames should always be
2012                          * sent with pairwise or station-to-station keys,
2013                          * but for WEP we allow using a key index as well.
2014                          */
2015                         if (rx->key &&
2016                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2017                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2018                             !is_multicast_ether_addr(hdr->addr1))
2019                                 rx->key = NULL;
2020                 }
2021         }
2022
2023         if (rx->key) {
2024                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2025                         return RX_DROP_MONITOR;
2026
2027                 /* TODO: add threshold stuff again */
2028         } else {
2029                 return RX_DROP_MONITOR;
2030         }
2031
2032         switch (rx->key->conf.cipher) {
2033         case WLAN_CIPHER_SUITE_WEP40:
2034         case WLAN_CIPHER_SUITE_WEP104:
2035                 result = ieee80211_crypto_wep_decrypt(rx);
2036                 break;
2037         case WLAN_CIPHER_SUITE_TKIP:
2038                 result = ieee80211_crypto_tkip_decrypt(rx);
2039                 break;
2040         case WLAN_CIPHER_SUITE_CCMP:
2041                 result = ieee80211_crypto_ccmp_decrypt(
2042                         rx, IEEE80211_CCMP_MIC_LEN);
2043                 break;
2044         case WLAN_CIPHER_SUITE_CCMP_256:
2045                 result = ieee80211_crypto_ccmp_decrypt(
2046                         rx, IEEE80211_CCMP_256_MIC_LEN);
2047                 break;
2048         case WLAN_CIPHER_SUITE_AES_CMAC:
2049                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2050                 break;
2051         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2052                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2053                 break;
2054         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2055         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2056                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2057                 break;
2058         case WLAN_CIPHER_SUITE_GCMP:
2059         case WLAN_CIPHER_SUITE_GCMP_256:
2060                 result = ieee80211_crypto_gcmp_decrypt(rx);
2061                 break;
2062         default:
2063                 result = ieee80211_crypto_hw_decrypt(rx);
2064         }
2065
2066         /* the hdr variable is invalid after the decrypt handlers */
2067
2068         /* either the frame has been decrypted or will be dropped */
2069         status->flag |= RX_FLAG_DECRYPTED;
2070
2071         return result;
2072 }
2073
2074 static inline struct ieee80211_fragment_entry *
2075 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2076                          unsigned int frag, unsigned int seq, int rx_queue,
2077                          struct sk_buff **skb)
2078 {
2079         struct ieee80211_fragment_entry *entry;
2080
2081         entry = &sdata->fragments[sdata->fragment_next++];
2082         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2083                 sdata->fragment_next = 0;
2084
2085         if (!skb_queue_empty(&entry->skb_list))
2086                 __skb_queue_purge(&entry->skb_list);
2087
2088         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2089         *skb = NULL;
2090         entry->first_frag_time = jiffies;
2091         entry->seq = seq;
2092         entry->rx_queue = rx_queue;
2093         entry->last_frag = frag;
2094         entry->check_sequential_pn = false;
2095         entry->extra_len = 0;
2096
2097         return entry;
2098 }
2099
2100 static inline struct ieee80211_fragment_entry *
2101 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2102                           unsigned int frag, unsigned int seq,
2103                           int rx_queue, struct ieee80211_hdr *hdr)
2104 {
2105         struct ieee80211_fragment_entry *entry;
2106         int i, idx;
2107
2108         idx = sdata->fragment_next;
2109         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2110                 struct ieee80211_hdr *f_hdr;
2111                 struct sk_buff *f_skb;
2112
2113                 idx--;
2114                 if (idx < 0)
2115                         idx = IEEE80211_FRAGMENT_MAX - 1;
2116
2117                 entry = &sdata->fragments[idx];
2118                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2119                     entry->rx_queue != rx_queue ||
2120                     entry->last_frag + 1 != frag)
2121                         continue;
2122
2123                 f_skb = __skb_peek(&entry->skb_list);
2124                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2125
2126                 /*
2127                  * Check ftype and addresses are equal, else check next fragment
2128                  */
2129                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2130                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2131                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2132                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2133                         continue;
2134
2135                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2136                         __skb_queue_purge(&entry->skb_list);
2137                         continue;
2138                 }
2139                 return entry;
2140         }
2141
2142         return NULL;
2143 }
2144
2145 static ieee80211_rx_result debug_noinline
2146 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2147 {
2148         struct ieee80211_hdr *hdr;
2149         u16 sc;
2150         __le16 fc;
2151         unsigned int frag, seq;
2152         struct ieee80211_fragment_entry *entry;
2153         struct sk_buff *skb;
2154
2155         hdr = (struct ieee80211_hdr *)rx->skb->data;
2156         fc = hdr->frame_control;
2157
2158         if (ieee80211_is_ctl(fc))
2159                 return RX_CONTINUE;
2160
2161         sc = le16_to_cpu(hdr->seq_ctrl);
2162         frag = sc & IEEE80211_SCTL_FRAG;
2163
2164         if (is_multicast_ether_addr(hdr->addr1)) {
2165                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2166                 goto out_no_led;
2167         }
2168
2169         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2170                 goto out;
2171
2172         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2173
2174         if (skb_linearize(rx->skb))
2175                 return RX_DROP_UNUSABLE;
2176
2177         /*
2178          *  skb_linearize() might change the skb->data and
2179          *  previously cached variables (in this case, hdr) need to
2180          *  be refreshed with the new data.
2181          */
2182         hdr = (struct ieee80211_hdr *)rx->skb->data;
2183         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2184
2185         if (frag == 0) {
2186                 /* This is the first fragment of a new frame. */
2187                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2188                                                  rx->seqno_idx, &(rx->skb));
2189                 if (rx->key &&
2190                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2191                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2192                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2193                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2194                     ieee80211_has_protected(fc)) {
2195                         int queue = rx->security_idx;
2196
2197                         /* Store CCMP/GCMP PN so that we can verify that the
2198                          * next fragment has a sequential PN value.
2199                          */
2200                         entry->check_sequential_pn = true;
2201                         memcpy(entry->last_pn,
2202                                rx->key->u.ccmp.rx_pn[queue],
2203                                IEEE80211_CCMP_PN_LEN);
2204                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2205                                               u.ccmp.rx_pn) !=
2206                                      offsetof(struct ieee80211_key,
2207                                               u.gcmp.rx_pn));
2208                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2209                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2210                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2211                                      IEEE80211_GCMP_PN_LEN);
2212                 }
2213                 return RX_QUEUED;
2214         }
2215
2216         /* This is a fragment for a frame that should already be pending in
2217          * fragment cache. Add this fragment to the end of the pending entry.
2218          */
2219         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2220                                           rx->seqno_idx, hdr);
2221         if (!entry) {
2222                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2223                 return RX_DROP_MONITOR;
2224         }
2225
2226         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2227          *  MPDU PN values are not incrementing in steps of 1."
2228          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2229          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2230          */
2231         if (entry->check_sequential_pn) {
2232                 int i;
2233                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2234                 int queue;
2235
2236                 if (!rx->key ||
2237                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2238                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2239                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2240                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2241                         return RX_DROP_UNUSABLE;
2242                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2243                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2244                         pn[i]++;
2245                         if (pn[i])
2246                                 break;
2247                 }
2248                 queue = rx->security_idx;
2249                 rpn = rx->key->u.ccmp.rx_pn[queue];
2250                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2251                         return RX_DROP_UNUSABLE;
2252                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2253         }
2254
2255         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2256         __skb_queue_tail(&entry->skb_list, rx->skb);
2257         entry->last_frag = frag;
2258         entry->extra_len += rx->skb->len;
2259         if (ieee80211_has_morefrags(fc)) {
2260                 rx->skb = NULL;
2261                 return RX_QUEUED;
2262         }
2263
2264         rx->skb = __skb_dequeue(&entry->skb_list);
2265         if (skb_tailroom(rx->skb) < entry->extra_len) {
2266                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2267                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2268                                               GFP_ATOMIC))) {
2269                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2270                         __skb_queue_purge(&entry->skb_list);
2271                         return RX_DROP_UNUSABLE;
2272                 }
2273         }
2274         while ((skb = __skb_dequeue(&entry->skb_list))) {
2275                 skb_put_data(rx->skb, skb->data, skb->len);
2276                 dev_kfree_skb(skb);
2277         }
2278
2279  out:
2280         ieee80211_led_rx(rx->local);
2281  out_no_led:
2282         if (rx->sta)
2283                 rx->sta->rx_stats.packets++;
2284         return RX_CONTINUE;
2285 }
2286
2287 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2288 {
2289         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2290                 return -EACCES;
2291
2292         return 0;
2293 }
2294
2295 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2296 {
2297         struct sk_buff *skb = rx->skb;
2298         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2299
2300         /*
2301          * Pass through unencrypted frames if the hardware has
2302          * decrypted them already.
2303          */
2304         if (status->flag & RX_FLAG_DECRYPTED)
2305                 return 0;
2306
2307         /* Drop unencrypted frames if key is set. */
2308         if (unlikely(!ieee80211_has_protected(fc) &&
2309                      !ieee80211_is_nullfunc(fc) &&
2310                      ieee80211_is_data(fc) && rx->key))
2311                 return -EACCES;
2312
2313         return 0;
2314 }
2315
2316 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2317 {
2318         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2319         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2320         __le16 fc = hdr->frame_control;
2321
2322         /*
2323          * Pass through unencrypted frames if the hardware has
2324          * decrypted them already.
2325          */
2326         if (status->flag & RX_FLAG_DECRYPTED)
2327                 return 0;
2328
2329         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2330                 if (unlikely(!ieee80211_has_protected(fc) &&
2331                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2332                              rx->key)) {
2333                         if (ieee80211_is_deauth(fc) ||
2334                             ieee80211_is_disassoc(fc))
2335                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2336                                                              rx->skb->data,
2337                                                              rx->skb->len);
2338                         return -EACCES;
2339                 }
2340                 /* BIP does not use Protected field, so need to check MMIE */
2341                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2342                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2343                         if (ieee80211_is_deauth(fc) ||
2344                             ieee80211_is_disassoc(fc))
2345                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2346                                                              rx->skb->data,
2347                                                              rx->skb->len);
2348                         return -EACCES;
2349                 }
2350                 /*
2351                  * When using MFP, Action frames are not allowed prior to
2352                  * having configured keys.
2353                  */
2354                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2355                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2356                         return -EACCES;
2357         }
2358
2359         return 0;
2360 }
2361
2362 static int
2363 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2364 {
2365         struct ieee80211_sub_if_data *sdata = rx->sdata;
2366         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2367         bool check_port_control = false;
2368         struct ethhdr *ehdr;
2369         int ret;
2370
2371         *port_control = false;
2372         if (ieee80211_has_a4(hdr->frame_control) &&
2373             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2374                 return -1;
2375
2376         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2377             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2378
2379                 if (!sdata->u.mgd.use_4addr)
2380                         return -1;
2381                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2382                         check_port_control = true;
2383         }
2384
2385         if (is_multicast_ether_addr(hdr->addr1) &&
2386             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2387                 return -1;
2388
2389         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2390         if (ret < 0)
2391                 return ret;
2392
2393         ehdr = (struct ethhdr *) rx->skb->data;
2394         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2395                 *port_control = true;
2396         else if (check_port_control)
2397                 return -1;
2398
2399         return 0;
2400 }
2401
2402 /*
2403  * requires that rx->skb is a frame with ethernet header
2404  */
2405 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2406 {
2407         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2408                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2409         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2410
2411         /*
2412          * Allow EAPOL frames to us/the PAE group address regardless
2413          * of whether the frame was encrypted or not.
2414          */
2415         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2416             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2417              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2418                 return true;
2419
2420         if (ieee80211_802_1x_port_control(rx) ||
2421             ieee80211_drop_unencrypted(rx, fc))
2422                 return false;
2423
2424         return true;
2425 }
2426
2427 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2428                                                  struct ieee80211_rx_data *rx)
2429 {
2430         struct ieee80211_sub_if_data *sdata = rx->sdata;
2431         struct net_device *dev = sdata->dev;
2432
2433         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2434                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2435                      sdata->control_port_over_nl80211)) {
2436                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2437                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2438
2439                 cfg80211_rx_control_port(dev, skb, noencrypt);
2440                 dev_kfree_skb(skb);
2441         } else {
2442                 /* deliver to local stack */
2443                 if (rx->napi)
2444                         napi_gro_receive(rx->napi, skb);
2445                 else
2446                         netif_receive_skb(skb);
2447         }
2448 }
2449
2450 /*
2451  * requires that rx->skb is a frame with ethernet header
2452  */
2453 static void
2454 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2455 {
2456         struct ieee80211_sub_if_data *sdata = rx->sdata;
2457         struct net_device *dev = sdata->dev;
2458         struct sk_buff *skb, *xmit_skb;
2459         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2460         struct sta_info *dsta;
2461
2462         skb = rx->skb;
2463         xmit_skb = NULL;
2464
2465         ieee80211_rx_stats(dev, skb->len);
2466
2467         if (rx->sta) {
2468                 /* The seqno index has the same property as needed
2469                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2470                  * for non-QoS-data frames. Here we know it's a data
2471                  * frame, so count MSDUs.
2472                  */
2473                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2474                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2475                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2476         }
2477
2478         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2479              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2480             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2481             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2482                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2483                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2484                         /*
2485                          * send multicast frames both to higher layers in
2486                          * local net stack and back to the wireless medium
2487                          */
2488                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2489                         if (!xmit_skb)
2490                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2491                                                     dev->name);
2492                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2493                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2494                         dsta = sta_info_get(sdata, ehdr->h_dest);
2495                         if (dsta) {
2496                                 /*
2497                                  * The destination station is associated to
2498                                  * this AP (in this VLAN), so send the frame
2499                                  * directly to it and do not pass it to local
2500                                  * net stack.
2501                                  */
2502                                 xmit_skb = skb;
2503                                 skb = NULL;
2504                         }
2505                 }
2506         }
2507
2508 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2509         if (skb) {
2510                 /* 'align' will only take the values 0 or 2 here since all
2511                  * frames are required to be aligned to 2-byte boundaries
2512                  * when being passed to mac80211; the code here works just
2513                  * as well if that isn't true, but mac80211 assumes it can
2514                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2515                  */
2516                 int align;
2517
2518                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2519                 if (align) {
2520                         if (WARN_ON(skb_headroom(skb) < 3)) {
2521                                 dev_kfree_skb(skb);
2522                                 skb = NULL;
2523                         } else {
2524                                 u8 *data = skb->data;
2525                                 size_t len = skb_headlen(skb);
2526                                 skb->data -= align;
2527                                 memmove(skb->data, data, len);
2528                                 skb_set_tail_pointer(skb, len);
2529                         }
2530                 }
2531         }
2532 #endif
2533
2534         if (skb) {
2535                 skb->protocol = eth_type_trans(skb, dev);
2536                 memset(skb->cb, 0, sizeof(skb->cb));
2537
2538                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2539         }
2540
2541         if (xmit_skb) {
2542                 /*
2543                  * Send to wireless media and increase priority by 256 to
2544                  * keep the received priority instead of reclassifying
2545                  * the frame (see cfg80211_classify8021d).
2546                  */
2547                 xmit_skb->priority += 256;
2548                 xmit_skb->protocol = htons(ETH_P_802_3);
2549                 skb_reset_network_header(xmit_skb);
2550                 skb_reset_mac_header(xmit_skb);
2551                 dev_queue_xmit(xmit_skb);
2552         }
2553 }
2554
2555 static ieee80211_rx_result debug_noinline
2556 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2557 {
2558         struct net_device *dev = rx->sdata->dev;
2559         struct sk_buff *skb = rx->skb;
2560         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2561         __le16 fc = hdr->frame_control;
2562         struct sk_buff_head frame_list;
2563         struct ethhdr ethhdr;
2564         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2565
2566         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2567                 check_da = NULL;
2568                 check_sa = NULL;
2569         } else switch (rx->sdata->vif.type) {
2570                 case NL80211_IFTYPE_AP:
2571                 case NL80211_IFTYPE_AP_VLAN:
2572                         check_da = NULL;
2573                         break;
2574                 case NL80211_IFTYPE_STATION:
2575                         if (!rx->sta ||
2576                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2577                                 check_sa = NULL;
2578                         break;
2579                 case NL80211_IFTYPE_MESH_POINT:
2580                         check_sa = NULL;
2581                         break;
2582                 default:
2583                         break;
2584         }
2585
2586         skb->dev = dev;
2587         __skb_queue_head_init(&frame_list);
2588
2589         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2590                                           rx->sdata->vif.addr,
2591                                           rx->sdata->vif.type,
2592                                           data_offset))
2593                 return RX_DROP_UNUSABLE;
2594
2595         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2596                                  rx->sdata->vif.type,
2597                                  rx->local->hw.extra_tx_headroom,
2598                                  check_da, check_sa);
2599
2600         while (!skb_queue_empty(&frame_list)) {
2601                 rx->skb = __skb_dequeue(&frame_list);
2602
2603                 if (!ieee80211_frame_allowed(rx, fc)) {
2604                         dev_kfree_skb(rx->skb);
2605                         continue;
2606                 }
2607
2608                 ieee80211_deliver_skb(rx);
2609         }
2610
2611         return RX_QUEUED;
2612 }
2613
2614 static ieee80211_rx_result debug_noinline
2615 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2616 {
2617         struct sk_buff *skb = rx->skb;
2618         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2619         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2620         __le16 fc = hdr->frame_control;
2621
2622         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2623                 return RX_CONTINUE;
2624
2625         if (unlikely(!ieee80211_is_data(fc)))
2626                 return RX_CONTINUE;
2627
2628         if (unlikely(!ieee80211_is_data_present(fc)))
2629                 return RX_DROP_MONITOR;
2630
2631         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2632                 switch (rx->sdata->vif.type) {
2633                 case NL80211_IFTYPE_AP_VLAN:
2634                         if (!rx->sdata->u.vlan.sta)
2635                                 return RX_DROP_UNUSABLE;
2636                         break;
2637                 case NL80211_IFTYPE_STATION:
2638                         if (!rx->sdata->u.mgd.use_4addr)
2639                                 return RX_DROP_UNUSABLE;
2640                         break;
2641                 default:
2642                         return RX_DROP_UNUSABLE;
2643                 }
2644         }
2645
2646         if (is_multicast_ether_addr(hdr->addr1))
2647                 return RX_DROP_UNUSABLE;
2648
2649         return __ieee80211_rx_h_amsdu(rx, 0);
2650 }
2651
2652 #ifdef CONFIG_MAC80211_MESH
2653 static ieee80211_rx_result
2654 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2655 {
2656         struct ieee80211_hdr *fwd_hdr, *hdr;
2657         struct ieee80211_tx_info *info;
2658         struct ieee80211s_hdr *mesh_hdr;
2659         struct sk_buff *skb = rx->skb, *fwd_skb;
2660         struct ieee80211_local *local = rx->local;
2661         struct ieee80211_sub_if_data *sdata = rx->sdata;
2662         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2663         u16 ac, q, hdrlen;
2664         int tailroom = 0;
2665
2666         hdr = (struct ieee80211_hdr *) skb->data;
2667         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2668
2669         /* make sure fixed part of mesh header is there, also checks skb len */
2670         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2671                 return RX_DROP_MONITOR;
2672
2673         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2674
2675         /* make sure full mesh header is there, also checks skb len */
2676         if (!pskb_may_pull(rx->skb,
2677                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2678                 return RX_DROP_MONITOR;
2679
2680         /* reload pointers */
2681         hdr = (struct ieee80211_hdr *) skb->data;
2682         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2683
2684         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2685                 return RX_DROP_MONITOR;
2686
2687         /* frame is in RMC, don't forward */
2688         if (ieee80211_is_data(hdr->frame_control) &&
2689             is_multicast_ether_addr(hdr->addr1) &&
2690             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2691                 return RX_DROP_MONITOR;
2692
2693         if (!ieee80211_is_data(hdr->frame_control))
2694                 return RX_CONTINUE;
2695
2696         if (!mesh_hdr->ttl)
2697                 return RX_DROP_MONITOR;
2698
2699         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2700                 struct mesh_path *mppath;
2701                 char *proxied_addr;
2702                 char *mpp_addr;
2703
2704                 if (is_multicast_ether_addr(hdr->addr1)) {
2705                         mpp_addr = hdr->addr3;
2706                         proxied_addr = mesh_hdr->eaddr1;
2707                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2708                             MESH_FLAGS_AE_A5_A6) {
2709                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2710                         mpp_addr = hdr->addr4;
2711                         proxied_addr = mesh_hdr->eaddr2;
2712                 } else {
2713                         return RX_DROP_MONITOR;
2714                 }
2715
2716                 rcu_read_lock();
2717                 mppath = mpp_path_lookup(sdata, proxied_addr);
2718                 if (!mppath) {
2719                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2720                 } else {
2721                         spin_lock_bh(&mppath->state_lock);
2722                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2723                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2724                         mppath->exp_time = jiffies;
2725                         spin_unlock_bh(&mppath->state_lock);
2726                 }
2727                 rcu_read_unlock();
2728         }
2729
2730         /* Frame has reached destination.  Don't forward */
2731         if (!is_multicast_ether_addr(hdr->addr1) &&
2732             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2733                 return RX_CONTINUE;
2734
2735         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2736         q = sdata->vif.hw_queue[ac];
2737         if (ieee80211_queue_stopped(&local->hw, q)) {
2738                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2739                 return RX_DROP_MONITOR;
2740         }
2741         skb_set_queue_mapping(skb, q);
2742
2743         if (!--mesh_hdr->ttl) {
2744                 if (!is_multicast_ether_addr(hdr->addr1))
2745                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2746                                                      dropped_frames_ttl);
2747                 goto out;
2748         }
2749
2750         if (!ifmsh->mshcfg.dot11MeshForwarding)
2751                 goto out;
2752
2753         if (sdata->crypto_tx_tailroom_needed_cnt)
2754                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2755
2756         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2757                                        sdata->encrypt_headroom,
2758                                   tailroom, GFP_ATOMIC);
2759         if (!fwd_skb)
2760                 goto out;
2761
2762         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2763         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2764         info = IEEE80211_SKB_CB(fwd_skb);
2765         memset(info, 0, sizeof(*info));
2766         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2767         info->control.vif = &rx->sdata->vif;
2768         info->control.jiffies = jiffies;
2769         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2770                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2771                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2772                 /* update power mode indication when forwarding */
2773                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2774         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2775                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2776                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2777         } else {
2778                 /* unable to resolve next hop */
2779                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2780                                    fwd_hdr->addr3, 0,
2781                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2782                                    fwd_hdr->addr2);
2783                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2784                 kfree_skb(fwd_skb);
2785                 return RX_DROP_MONITOR;
2786         }
2787
2788         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2789         ieee80211_add_pending_skb(local, fwd_skb);
2790  out:
2791         if (is_multicast_ether_addr(hdr->addr1))
2792                 return RX_CONTINUE;
2793         return RX_DROP_MONITOR;
2794 }
2795 #endif
2796
2797 static ieee80211_rx_result debug_noinline
2798 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2799 {
2800         struct ieee80211_sub_if_data *sdata = rx->sdata;
2801         struct ieee80211_local *local = rx->local;
2802         struct net_device *dev = sdata->dev;
2803         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2804         __le16 fc = hdr->frame_control;
2805         bool port_control;
2806         int err;
2807
2808         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2809                 return RX_CONTINUE;
2810
2811         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2812                 return RX_DROP_MONITOR;
2813
2814         /*
2815          * Send unexpected-4addr-frame event to hostapd. For older versions,
2816          * also drop the frame to cooked monitor interfaces.
2817          */
2818         if (ieee80211_has_a4(hdr->frame_control) &&
2819             sdata->vif.type == NL80211_IFTYPE_AP) {
2820                 if (rx->sta &&
2821                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2822                         cfg80211_rx_unexpected_4addr_frame(
2823                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2824                 return RX_DROP_MONITOR;
2825         }
2826
2827         err = __ieee80211_data_to_8023(rx, &port_control);
2828         if (unlikely(err))
2829                 return RX_DROP_UNUSABLE;
2830
2831         if (!ieee80211_frame_allowed(rx, fc))
2832                 return RX_DROP_MONITOR;
2833
2834         /* directly handle TDLS channel switch requests/responses */
2835         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2836                                                 cpu_to_be16(ETH_P_TDLS))) {
2837                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2838
2839                 if (pskb_may_pull(rx->skb,
2840                                   offsetof(struct ieee80211_tdls_data, u)) &&
2841                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2842                     tf->category == WLAN_CATEGORY_TDLS &&
2843                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2844                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2845                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2846                         schedule_work(&local->tdls_chsw_work);
2847                         if (rx->sta)
2848                                 rx->sta->rx_stats.packets++;
2849
2850                         return RX_QUEUED;
2851                 }
2852         }
2853
2854         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2855             unlikely(port_control) && sdata->bss) {
2856                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2857                                      u.ap);
2858                 dev = sdata->dev;
2859                 rx->sdata = sdata;
2860         }
2861
2862         rx->skb->dev = dev;
2863
2864         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2865             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2866             !is_multicast_ether_addr(
2867                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2868             (!local->scanning &&
2869              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2870                 mod_timer(&local->dynamic_ps_timer, jiffies +
2871                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2872
2873         ieee80211_deliver_skb(rx);
2874
2875         return RX_QUEUED;
2876 }
2877
2878 static ieee80211_rx_result debug_noinline
2879 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2880 {
2881         struct sk_buff *skb = rx->skb;
2882         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2883         struct tid_ampdu_rx *tid_agg_rx;
2884         u16 start_seq_num;
2885         u16 tid;
2886
2887         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2888                 return RX_CONTINUE;
2889
2890         if (ieee80211_is_back_req(bar->frame_control)) {
2891                 struct {
2892                         __le16 control, start_seq_num;
2893                 } __packed bar_data;
2894                 struct ieee80211_event event = {
2895                         .type = BAR_RX_EVENT,
2896                 };
2897
2898                 if (!rx->sta)
2899                         return RX_DROP_MONITOR;
2900
2901                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2902                                   &bar_data, sizeof(bar_data)))
2903                         return RX_DROP_MONITOR;
2904
2905                 tid = le16_to_cpu(bar_data.control) >> 12;
2906
2907                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2908                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2909                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2910                                              WLAN_BACK_RECIPIENT,
2911                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2912
2913                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2914                 if (!tid_agg_rx)
2915                         return RX_DROP_MONITOR;
2916
2917                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2918                 event.u.ba.tid = tid;
2919                 event.u.ba.ssn = start_seq_num;
2920                 event.u.ba.sta = &rx->sta->sta;
2921
2922                 /* reset session timer */
2923                 if (tid_agg_rx->timeout)
2924                         mod_timer(&tid_agg_rx->session_timer,
2925                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2926
2927                 spin_lock(&tid_agg_rx->reorder_lock);
2928                 /* release stored frames up to start of BAR */
2929                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2930                                                  start_seq_num, frames);
2931                 spin_unlock(&tid_agg_rx->reorder_lock);
2932
2933                 drv_event_callback(rx->local, rx->sdata, &event);
2934
2935                 kfree_skb(skb);
2936                 return RX_QUEUED;
2937         }
2938
2939         /*
2940          * After this point, we only want management frames,
2941          * so we can drop all remaining control frames to
2942          * cooked monitor interfaces.
2943          */
2944         return RX_DROP_MONITOR;
2945 }
2946
2947 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2948                                            struct ieee80211_mgmt *mgmt,
2949                                            size_t len)
2950 {
2951         struct ieee80211_local *local = sdata->local;
2952         struct sk_buff *skb;
2953         struct ieee80211_mgmt *resp;
2954
2955         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2956                 /* Not to own unicast address */
2957                 return;
2958         }
2959
2960         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2961             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2962                 /* Not from the current AP or not associated yet. */
2963                 return;
2964         }
2965
2966         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2967                 /* Too short SA Query request frame */
2968                 return;
2969         }
2970
2971         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2972         if (skb == NULL)
2973                 return;
2974
2975         skb_reserve(skb, local->hw.extra_tx_headroom);
2976         resp = skb_put_zero(skb, 24);
2977         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2978         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2979         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2980         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2981                                           IEEE80211_STYPE_ACTION);
2982         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2983         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2984         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2985         memcpy(resp->u.action.u.sa_query.trans_id,
2986                mgmt->u.action.u.sa_query.trans_id,
2987                WLAN_SA_QUERY_TR_ID_LEN);
2988
2989         ieee80211_tx_skb(sdata, skb);
2990 }
2991
2992 static ieee80211_rx_result debug_noinline
2993 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2994 {
2995         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2996         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2997
2998         /*
2999          * From here on, look only at management frames.
3000          * Data and control frames are already handled,
3001          * and unknown (reserved) frames are useless.
3002          */
3003         if (rx->skb->len < 24)
3004                 return RX_DROP_MONITOR;
3005
3006         if (!ieee80211_is_mgmt(mgmt->frame_control))
3007                 return RX_DROP_MONITOR;
3008
3009         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3010             ieee80211_is_beacon(mgmt->frame_control) &&
3011             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3012                 int sig = 0;
3013
3014                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3015                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3016                         sig = status->signal;
3017
3018                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3019                                             rx->skb->data, rx->skb->len,
3020                                             status->freq, sig);
3021                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3022         }
3023
3024         if (ieee80211_drop_unencrypted_mgmt(rx))
3025                 return RX_DROP_UNUSABLE;
3026
3027         return RX_CONTINUE;
3028 }
3029
3030 static ieee80211_rx_result debug_noinline
3031 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3032 {
3033         struct ieee80211_local *local = rx->local;
3034         struct ieee80211_sub_if_data *sdata = rx->sdata;
3035         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3036         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3037         int len = rx->skb->len;
3038
3039         if (!ieee80211_is_action(mgmt->frame_control))
3040                 return RX_CONTINUE;
3041
3042         /* drop too small frames */
3043         if (len < IEEE80211_MIN_ACTION_SIZE)
3044                 return RX_DROP_UNUSABLE;
3045
3046         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3047             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3048             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3049                 return RX_DROP_UNUSABLE;
3050
3051         switch (mgmt->u.action.category) {
3052         case WLAN_CATEGORY_HT:
3053                 /* reject HT action frames from stations not supporting HT */
3054                 if (!rx->sta->sta.ht_cap.ht_supported)
3055                         goto invalid;
3056
3057                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3058                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3059                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3060                     sdata->vif.type != NL80211_IFTYPE_AP &&
3061                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3062                         break;
3063
3064                 /* verify action & smps_control/chanwidth are present */
3065                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3066                         goto invalid;
3067
3068                 switch (mgmt->u.action.u.ht_smps.action) {
3069                 case WLAN_HT_ACTION_SMPS: {
3070                         struct ieee80211_supported_band *sband;
3071                         enum ieee80211_smps_mode smps_mode;
3072                         struct sta_opmode_info sta_opmode = {};
3073
3074                         /* convert to HT capability */
3075                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3076                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3077                                 smps_mode = IEEE80211_SMPS_OFF;
3078                                 break;
3079                         case WLAN_HT_SMPS_CONTROL_STATIC:
3080                                 smps_mode = IEEE80211_SMPS_STATIC;
3081                                 break;
3082                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3083                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3084                                 break;
3085                         default:
3086                                 goto invalid;
3087                         }
3088
3089                         /* if no change do nothing */
3090                         if (rx->sta->sta.smps_mode == smps_mode)
3091                                 goto handled;
3092                         rx->sta->sta.smps_mode = smps_mode;
3093                         sta_opmode.smps_mode =
3094                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3095                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3096
3097                         sband = rx->local->hw.wiphy->bands[status->band];
3098
3099                         rate_control_rate_update(local, sband, rx->sta,
3100                                                  IEEE80211_RC_SMPS_CHANGED);
3101                         cfg80211_sta_opmode_change_notify(sdata->dev,
3102                                                           rx->sta->addr,
3103                                                           &sta_opmode,
3104                                                           GFP_ATOMIC);
3105                         goto handled;
3106                 }
3107                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3108                         struct ieee80211_supported_band *sband;
3109                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3110                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3111                         struct sta_opmode_info sta_opmode = {};
3112
3113                         /* If it doesn't support 40 MHz it can't change ... */
3114                         if (!(rx->sta->sta.ht_cap.cap &
3115                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3116                                 goto handled;
3117
3118                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3119                                 max_bw = IEEE80211_STA_RX_BW_20;
3120                         else
3121                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3122
3123                         /* set cur_max_bandwidth and recalc sta bw */
3124                         rx->sta->cur_max_bandwidth = max_bw;
3125                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3126
3127                         if (rx->sta->sta.bandwidth == new_bw)
3128                                 goto handled;
3129
3130                         rx->sta->sta.bandwidth = new_bw;
3131                         sband = rx->local->hw.wiphy->bands[status->band];
3132                         sta_opmode.bw =
3133                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3134                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3135
3136                         rate_control_rate_update(local, sband, rx->sta,
3137                                                  IEEE80211_RC_BW_CHANGED);
3138                         cfg80211_sta_opmode_change_notify(sdata->dev,
3139                                                           rx->sta->addr,
3140                                                           &sta_opmode,
3141                                                           GFP_ATOMIC);
3142                         goto handled;
3143                 }
3144                 default:
3145                         goto invalid;
3146                 }
3147
3148                 break;
3149         case WLAN_CATEGORY_PUBLIC:
3150                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3151                         goto invalid;
3152                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3153                         break;
3154                 if (!rx->sta)
3155                         break;
3156                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3157                         break;
3158                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3159                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3160                         break;
3161                 if (len < offsetof(struct ieee80211_mgmt,
3162                                    u.action.u.ext_chan_switch.variable))
3163                         goto invalid;
3164                 goto queue;
3165         case WLAN_CATEGORY_VHT:
3166                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3167                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3168                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3169                     sdata->vif.type != NL80211_IFTYPE_AP &&
3170                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3171                         break;
3172
3173                 /* verify action code is present */
3174                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3175                         goto invalid;
3176
3177                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3178                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3179                         /* verify opmode is present */
3180                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3181                                 goto invalid;
3182                         goto queue;
3183                 }
3184                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3185                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3186                                 goto invalid;
3187                         goto queue;
3188                 }
3189                 default:
3190                         break;
3191                 }
3192                 break;
3193         case WLAN_CATEGORY_BACK:
3194                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3195                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3196                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3197                     sdata->vif.type != NL80211_IFTYPE_AP &&
3198                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3199                         break;
3200
3201                 /* verify action_code is present */
3202                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3203                         break;
3204
3205                 switch (mgmt->u.action.u.addba_req.action_code) {
3206                 case WLAN_ACTION_ADDBA_REQ:
3207                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3208                                    sizeof(mgmt->u.action.u.addba_req)))
3209                                 goto invalid;
3210                         break;
3211                 case WLAN_ACTION_ADDBA_RESP:
3212                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3213                                    sizeof(mgmt->u.action.u.addba_resp)))
3214                                 goto invalid;
3215                         break;
3216                 case WLAN_ACTION_DELBA:
3217                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3218                                    sizeof(mgmt->u.action.u.delba)))
3219                                 goto invalid;
3220                         break;
3221                 default:
3222                         goto invalid;
3223                 }
3224
3225                 goto queue;
3226         case WLAN_CATEGORY_SPECTRUM_MGMT:
3227                 /* verify action_code is present */
3228                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3229                         break;
3230
3231                 switch (mgmt->u.action.u.measurement.action_code) {
3232                 case WLAN_ACTION_SPCT_MSR_REQ:
3233                         if (status->band != NL80211_BAND_5GHZ)
3234                                 break;
3235
3236                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3237                                    sizeof(mgmt->u.action.u.measurement)))
3238                                 break;
3239
3240                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3241                                 break;
3242
3243                         ieee80211_process_measurement_req(sdata, mgmt, len);
3244                         goto handled;
3245                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3246                         u8 *bssid;
3247                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3248                                    sizeof(mgmt->u.action.u.chan_switch)))
3249                                 break;
3250
3251                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3252                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3253                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3254                                 break;
3255
3256                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3257                                 bssid = sdata->u.mgd.bssid;
3258                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3259                                 bssid = sdata->u.ibss.bssid;
3260                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3261                                 bssid = mgmt->sa;
3262                         else
3263                                 break;
3264
3265                         if (!ether_addr_equal(mgmt->bssid, bssid))
3266                                 break;
3267
3268                         goto queue;
3269                         }
3270                 }
3271                 break;
3272         case WLAN_CATEGORY_SA_QUERY:
3273                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3274                            sizeof(mgmt->u.action.u.sa_query)))
3275                         break;
3276
3277                 switch (mgmt->u.action.u.sa_query.action) {
3278                 case WLAN_ACTION_SA_QUERY_REQUEST:
3279                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3280                                 break;
3281                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3282                         goto handled;
3283                 }
3284                 break;
3285         case WLAN_CATEGORY_SELF_PROTECTED:
3286                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3287                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3288                         break;
3289
3290                 switch (mgmt->u.action.u.self_prot.action_code) {
3291                 case WLAN_SP_MESH_PEERING_OPEN:
3292                 case WLAN_SP_MESH_PEERING_CLOSE:
3293                 case WLAN_SP_MESH_PEERING_CONFIRM:
3294                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3295                                 goto invalid;
3296                         if (sdata->u.mesh.user_mpm)
3297                                 /* userspace handles this frame */
3298                                 break;
3299                         goto queue;
3300                 case WLAN_SP_MGK_INFORM:
3301                 case WLAN_SP_MGK_ACK:
3302                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3303                                 goto invalid;
3304                         break;
3305                 }
3306                 break;
3307         case WLAN_CATEGORY_MESH_ACTION:
3308                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3309                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3310                         break;
3311
3312                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3313                         break;
3314                 if (mesh_action_is_path_sel(mgmt) &&
3315                     !mesh_path_sel_is_hwmp(sdata))
3316                         break;
3317                 goto queue;
3318         }
3319
3320         return RX_CONTINUE;
3321
3322  invalid:
3323         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3324         /* will return in the next handlers */
3325         return RX_CONTINUE;
3326
3327  handled:
3328         if (rx->sta)
3329                 rx->sta->rx_stats.packets++;
3330         dev_kfree_skb(rx->skb);
3331         return RX_QUEUED;
3332
3333  queue:
3334         skb_queue_tail(&sdata->skb_queue, rx->skb);
3335         ieee80211_queue_work(&local->hw, &sdata->work);
3336         if (rx->sta)
3337                 rx->sta->rx_stats.packets++;
3338         return RX_QUEUED;
3339 }
3340
3341 static ieee80211_rx_result debug_noinline
3342 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3343 {
3344         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3345         int sig = 0;
3346
3347         /* skip known-bad action frames and return them in the next handler */
3348         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3349                 return RX_CONTINUE;
3350
3351         /*
3352          * Getting here means the kernel doesn't know how to handle
3353          * it, but maybe userspace does ... include returned frames
3354          * so userspace can register for those to know whether ones
3355          * it transmitted were processed or returned.
3356          */
3357
3358         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3359             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3360                 sig = status->signal;
3361
3362         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3363                              rx->skb->data, rx->skb->len, 0)) {
3364                 if (rx->sta)
3365                         rx->sta->rx_stats.packets++;
3366                 dev_kfree_skb(rx->skb);
3367                 return RX_QUEUED;
3368         }
3369
3370         return RX_CONTINUE;
3371 }
3372
3373 static ieee80211_rx_result debug_noinline
3374 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3375 {
3376         struct ieee80211_local *local = rx->local;
3377         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3378         struct sk_buff *nskb;
3379         struct ieee80211_sub_if_data *sdata = rx->sdata;
3380         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3381
3382         if (!ieee80211_is_action(mgmt->frame_control))
3383                 return RX_CONTINUE;
3384
3385         /*
3386          * For AP mode, hostapd is responsible for handling any action
3387          * frames that we didn't handle, including returning unknown
3388          * ones. For all other modes we will return them to the sender,
3389          * setting the 0x80 bit in the action category, as required by
3390          * 802.11-2012 9.24.4.
3391          * Newer versions of hostapd shall also use the management frame
3392          * registration mechanisms, but older ones still use cooked
3393          * monitor interfaces so push all frames there.
3394          */
3395         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3396             (sdata->vif.type == NL80211_IFTYPE_AP ||
3397              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3398                 return RX_DROP_MONITOR;
3399
3400         if (is_multicast_ether_addr(mgmt->da))
3401                 return RX_DROP_MONITOR;
3402
3403         /* do not return rejected action frames */
3404         if (mgmt->u.action.category & 0x80)
3405                 return RX_DROP_UNUSABLE;
3406
3407         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3408                                GFP_ATOMIC);
3409         if (nskb) {
3410                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3411
3412                 nmgmt->u.action.category |= 0x80;
3413                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3414                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3415
3416                 memset(nskb->cb, 0, sizeof(nskb->cb));
3417
3418                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3419                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3420
3421                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3422                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3423                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3424                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3425                                 info->hw_queue =
3426                                         local->hw.offchannel_tx_hw_queue;
3427                 }
3428
3429                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3430                                             status->band, 0);
3431         }
3432         dev_kfree_skb(rx->skb);
3433         return RX_QUEUED;
3434 }
3435
3436 static ieee80211_rx_result debug_noinline
3437 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3438 {
3439         struct ieee80211_sub_if_data *sdata = rx->sdata;
3440         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3441         __le16 stype;
3442
3443         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3444
3445         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3446             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3447             sdata->vif.type != NL80211_IFTYPE_OCB &&
3448             sdata->vif.type != NL80211_IFTYPE_STATION)
3449                 return RX_DROP_MONITOR;
3450
3451         switch (stype) {
3452         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3453         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3454         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3455                 /* process for all: mesh, mlme, ibss */
3456                 break;
3457         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3458         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3459         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3460         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3461                 if (is_multicast_ether_addr(mgmt->da) &&
3462                     !is_broadcast_ether_addr(mgmt->da))
3463                         return RX_DROP_MONITOR;
3464
3465                 /* process only for station */
3466                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3467                         return RX_DROP_MONITOR;
3468                 break;
3469         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3470                 /* process only for ibss and mesh */
3471                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3472                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3473                         return RX_DROP_MONITOR;
3474                 break;
3475         default:
3476                 return RX_DROP_MONITOR;
3477         }
3478
3479         /* queue up frame and kick off work to process it */
3480         skb_queue_tail(&sdata->skb_queue, rx->skb);
3481         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3482         if (rx->sta)
3483                 rx->sta->rx_stats.packets++;
3484
3485         return RX_QUEUED;
3486 }
3487
3488 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3489                                         struct ieee80211_rate *rate)
3490 {
3491         struct ieee80211_sub_if_data *sdata;
3492         struct ieee80211_local *local = rx->local;
3493         struct sk_buff *skb = rx->skb, *skb2;
3494         struct net_device *prev_dev = NULL;
3495         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3496         int needed_headroom;
3497
3498         /*
3499          * If cooked monitor has been processed already, then
3500          * don't do it again. If not, set the flag.
3501          */
3502         if (rx->flags & IEEE80211_RX_CMNTR)
3503                 goto out_free_skb;
3504         rx->flags |= IEEE80211_RX_CMNTR;
3505
3506         /* If there are no cooked monitor interfaces, just free the SKB */
3507         if (!local->cooked_mntrs)
3508                 goto out_free_skb;
3509
3510         /* vendor data is long removed here */
3511         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3512         /* room for the radiotap header based on driver features */
3513         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3514
3515         if (skb_headroom(skb) < needed_headroom &&
3516             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3517                 goto out_free_skb;
3518
3519         /* prepend radiotap information */
3520         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3521                                          false);
3522
3523         skb_reset_mac_header(skb);
3524         skb->ip_summed = CHECKSUM_UNNECESSARY;
3525         skb->pkt_type = PACKET_OTHERHOST;
3526         skb->protocol = htons(ETH_P_802_2);
3527
3528         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3529                 if (!ieee80211_sdata_running(sdata))
3530                         continue;
3531
3532                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3533                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3534                         continue;
3535
3536                 if (prev_dev) {
3537                         skb2 = skb_clone(skb, GFP_ATOMIC);
3538                         if (skb2) {
3539                                 skb2->dev = prev_dev;
3540                                 netif_receive_skb(skb2);
3541                         }
3542                 }
3543
3544                 prev_dev = sdata->dev;
3545                 ieee80211_rx_stats(sdata->dev, skb->len);
3546         }
3547
3548         if (prev_dev) {
3549                 skb->dev = prev_dev;
3550                 netif_receive_skb(skb);
3551                 return;
3552         }
3553
3554  out_free_skb:
3555         dev_kfree_skb(skb);
3556 }
3557
3558 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3559                                          ieee80211_rx_result res)
3560 {
3561         switch (res) {
3562         case RX_DROP_MONITOR:
3563                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3564                 if (rx->sta)
3565                         rx->sta->rx_stats.dropped++;
3566                 /* fall through */
3567         case RX_CONTINUE: {
3568                 struct ieee80211_rate *rate = NULL;
3569                 struct ieee80211_supported_band *sband;
3570                 struct ieee80211_rx_status *status;
3571
3572                 status = IEEE80211_SKB_RXCB((rx->skb));
3573
3574                 sband = rx->local->hw.wiphy->bands[status->band];
3575                 if (status->encoding == RX_ENC_LEGACY)
3576                         rate = &sband->bitrates[status->rate_idx];
3577
3578                 ieee80211_rx_cooked_monitor(rx, rate);
3579                 break;
3580                 }
3581         case RX_DROP_UNUSABLE:
3582                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3583                 if (rx->sta)
3584                         rx->sta->rx_stats.dropped++;
3585                 dev_kfree_skb(rx->skb);
3586                 break;
3587         case RX_QUEUED:
3588                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3589                 break;
3590         }
3591 }
3592
3593 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3594                                   struct sk_buff_head *frames)
3595 {
3596         ieee80211_rx_result res = RX_DROP_MONITOR;
3597         struct sk_buff *skb;
3598
3599 #define CALL_RXH(rxh)                   \
3600         do {                            \
3601                 res = rxh(rx);          \
3602                 if (res != RX_CONTINUE) \
3603                         goto rxh_next;  \
3604         } while (0)
3605
3606         /* Lock here to avoid hitting all of the data used in the RX
3607          * path (e.g. key data, station data, ...) concurrently when
3608          * a frame is released from the reorder buffer due to timeout
3609          * from the timer, potentially concurrently with RX from the
3610          * driver.
3611          */
3612         spin_lock_bh(&rx->local->rx_path_lock);
3613
3614         while ((skb = __skb_dequeue(frames))) {
3615                 /*
3616                  * all the other fields are valid across frames
3617                  * that belong to an aMPDU since they are on the
3618                  * same TID from the same station
3619                  */
3620                 rx->skb = skb;
3621
3622                 CALL_RXH(ieee80211_rx_h_check_more_data);
3623                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3624                 CALL_RXH(ieee80211_rx_h_sta_process);
3625                 CALL_RXH(ieee80211_rx_h_decrypt);
3626                 CALL_RXH(ieee80211_rx_h_defragment);
3627                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3628                 /* must be after MMIC verify so header is counted in MPDU mic */
3629 #ifdef CONFIG_MAC80211_MESH
3630                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3631                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3632 #endif
3633                 CALL_RXH(ieee80211_rx_h_amsdu);
3634                 CALL_RXH(ieee80211_rx_h_data);
3635
3636                 /* special treatment -- needs the queue */
3637                 res = ieee80211_rx_h_ctrl(rx, frames);
3638                 if (res != RX_CONTINUE)
3639                         goto rxh_next;
3640
3641                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3642                 CALL_RXH(ieee80211_rx_h_action);
3643                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3644                 CALL_RXH(ieee80211_rx_h_action_return);
3645                 CALL_RXH(ieee80211_rx_h_mgmt);
3646
3647  rxh_next:
3648                 ieee80211_rx_handlers_result(rx, res);
3649
3650 #undef CALL_RXH
3651         }
3652
3653         spin_unlock_bh(&rx->local->rx_path_lock);
3654 }
3655
3656 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3657 {
3658         struct sk_buff_head reorder_release;
3659         ieee80211_rx_result res = RX_DROP_MONITOR;
3660
3661         __skb_queue_head_init(&reorder_release);
3662
3663 #define CALL_RXH(rxh)                   \
3664         do {                            \
3665                 res = rxh(rx);          \
3666                 if (res != RX_CONTINUE) \
3667                         goto rxh_next;  \
3668         } while (0)
3669
3670         CALL_RXH(ieee80211_rx_h_check_dup);
3671         CALL_RXH(ieee80211_rx_h_check);
3672
3673         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3674
3675         ieee80211_rx_handlers(rx, &reorder_release);
3676         return;
3677
3678  rxh_next:
3679         ieee80211_rx_handlers_result(rx, res);
3680
3681 #undef CALL_RXH
3682 }
3683
3684 /*
3685  * This function makes calls into the RX path, therefore
3686  * it has to be invoked under RCU read lock.
3687  */
3688 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3689 {
3690         struct sk_buff_head frames;
3691         struct ieee80211_rx_data rx = {
3692                 .sta = sta,
3693                 .sdata = sta->sdata,
3694                 .local = sta->local,
3695                 /* This is OK -- must be QoS data frame */
3696                 .security_idx = tid,
3697                 .seqno_idx = tid,
3698                 .napi = NULL, /* must be NULL to not have races */
3699         };
3700         struct tid_ampdu_rx *tid_agg_rx;
3701
3702         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3703         if (!tid_agg_rx)
3704                 return;
3705
3706         __skb_queue_head_init(&frames);
3707
3708         spin_lock(&tid_agg_rx->reorder_lock);
3709         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3710         spin_unlock(&tid_agg_rx->reorder_lock);
3711
3712         if (!skb_queue_empty(&frames)) {
3713                 struct ieee80211_event event = {
3714                         .type = BA_FRAME_TIMEOUT,
3715                         .u.ba.tid = tid,
3716                         .u.ba.sta = &sta->sta,
3717                 };
3718                 drv_event_callback(rx.local, rx.sdata, &event);
3719         }
3720
3721         ieee80211_rx_handlers(&rx, &frames);
3722 }
3723
3724 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3725                                           u16 ssn, u64 filtered,
3726                                           u16 received_mpdus)
3727 {
3728         struct sta_info *sta;
3729         struct tid_ampdu_rx *tid_agg_rx;
3730         struct sk_buff_head frames;
3731         struct ieee80211_rx_data rx = {
3732                 /* This is OK -- must be QoS data frame */
3733                 .security_idx = tid,
3734                 .seqno_idx = tid,
3735         };
3736         int i, diff;
3737
3738         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3739                 return;
3740
3741         __skb_queue_head_init(&frames);
3742
3743         sta = container_of(pubsta, struct sta_info, sta);
3744
3745         rx.sta = sta;
3746         rx.sdata = sta->sdata;
3747         rx.local = sta->local;
3748
3749         rcu_read_lock();
3750         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3751         if (!tid_agg_rx)
3752                 goto out;
3753
3754         spin_lock_bh(&tid_agg_rx->reorder_lock);
3755
3756         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3757                 int release;
3758
3759                 /* release all frames in the reorder buffer */
3760                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3761                            IEEE80211_SN_MODULO;
3762                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3763                                                  release, &frames);
3764                 /* update ssn to match received ssn */
3765                 tid_agg_rx->head_seq_num = ssn;
3766         } else {
3767                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3768                                                  &frames);
3769         }
3770
3771         /* handle the case that received ssn is behind the mac ssn.
3772          * it can be tid_agg_rx->buf_size behind and still be valid */
3773         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3774         if (diff >= tid_agg_rx->buf_size) {
3775                 tid_agg_rx->reorder_buf_filtered = 0;
3776                 goto release;
3777         }
3778         filtered = filtered >> diff;
3779         ssn += diff;
3780
3781         /* update bitmap */
3782         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3783                 int index = (ssn + i) % tid_agg_rx->buf_size;
3784
3785                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3786                 if (filtered & BIT_ULL(i))
3787                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3788         }
3789
3790         /* now process also frames that the filter marking released */
3791         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3792
3793 release:
3794         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3795
3796         ieee80211_rx_handlers(&rx, &frames);
3797
3798  out:
3799         rcu_read_unlock();
3800 }
3801 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3802
3803 /* main receive path */
3804
3805 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3806 {
3807         struct ieee80211_sub_if_data *sdata = rx->sdata;
3808         struct sk_buff *skb = rx->skb;
3809         struct ieee80211_hdr *hdr = (void *)skb->data;
3810         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3811         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3812         bool multicast = is_multicast_ether_addr(hdr->addr1);
3813
3814         switch (sdata->vif.type) {
3815         case NL80211_IFTYPE_STATION:
3816                 if (!bssid && !sdata->u.mgd.use_4addr)
3817                         return false;
3818                 if (multicast)
3819                         return true;
3820                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3821         case NL80211_IFTYPE_ADHOC:
3822                 if (!bssid)
3823                         return false;
3824                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3825                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3826                         return false;
3827                 if (ieee80211_is_beacon(hdr->frame_control))
3828                         return true;
3829                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3830                         return false;
3831                 if (!multicast &&
3832                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3833                         return false;
3834                 if (!rx->sta) {
3835                         int rate_idx;
3836                         if (status->encoding != RX_ENC_LEGACY)
3837                                 rate_idx = 0; /* TODO: HT/VHT rates */
3838                         else
3839                                 rate_idx = status->rate_idx;
3840                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3841                                                  BIT(rate_idx));
3842                 }
3843                 return true;
3844         case NL80211_IFTYPE_OCB:
3845                 if (!bssid)
3846                         return false;
3847                 if (!ieee80211_is_data_present(hdr->frame_control))
3848                         return false;
3849                 if (!is_broadcast_ether_addr(bssid))
3850                         return false;
3851                 if (!multicast &&
3852                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3853                         return false;
3854                 if (!rx->sta) {
3855                         int rate_idx;
3856                         if (status->encoding != RX_ENC_LEGACY)
3857                                 rate_idx = 0; /* TODO: HT rates */
3858                         else
3859                                 rate_idx = status->rate_idx;
3860                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3861                                                 BIT(rate_idx));
3862                 }
3863                 return true;
3864         case NL80211_IFTYPE_MESH_POINT:
3865                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3866                         return false;
3867                 if (multicast)
3868                         return true;
3869                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3870         case NL80211_IFTYPE_AP_VLAN:
3871         case NL80211_IFTYPE_AP:
3872                 if (!bssid)
3873                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3874
3875                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3876                         /*
3877                          * Accept public action frames even when the
3878                          * BSSID doesn't match, this is used for P2P
3879                          * and location updates. Note that mac80211
3880                          * itself never looks at these frames.
3881                          */
3882                         if (!multicast &&
3883                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3884                                 return false;
3885                         if (ieee80211_is_public_action(hdr, skb->len))
3886                                 return true;
3887                         return ieee80211_is_beacon(hdr->frame_control);
3888                 }
3889
3890                 if (!ieee80211_has_tods(hdr->frame_control)) {
3891                         /* ignore data frames to TDLS-peers */
3892                         if (ieee80211_is_data(hdr->frame_control))
3893                                 return false;
3894                         /* ignore action frames to TDLS-peers */
3895                         if (ieee80211_is_action(hdr->frame_control) &&
3896                             !is_broadcast_ether_addr(bssid) &&
3897                             !ether_addr_equal(bssid, hdr->addr1))
3898                                 return false;
3899                 }
3900
3901                 /*
3902                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3903                  * the BSSID - we've checked that already but may have accepted
3904                  * the wildcard (ff:ff:ff:ff:ff:ff).
3905                  *
3906                  * It also says:
3907                  *      The BSSID of the Data frame is determined as follows:
3908                  *      a) If the STA is contained within an AP or is associated
3909                  *         with an AP, the BSSID is the address currently in use
3910                  *         by the STA contained in the AP.
3911                  *
3912                  * So we should not accept data frames with an address that's
3913                  * multicast.
3914                  *
3915                  * Accepting it also opens a security problem because stations
3916                  * could encrypt it with the GTK and inject traffic that way.
3917                  */
3918                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3919                         return false;
3920
3921                 return true;
3922         case NL80211_IFTYPE_WDS:
3923                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3924                         return false;
3925                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3926         case NL80211_IFTYPE_P2P_DEVICE:
3927                 return ieee80211_is_public_action(hdr, skb->len) ||
3928                        ieee80211_is_probe_req(hdr->frame_control) ||
3929                        ieee80211_is_probe_resp(hdr->frame_control) ||
3930                        ieee80211_is_beacon(hdr->frame_control);
3931         case NL80211_IFTYPE_NAN:
3932                 /* Currently no frames on NAN interface are allowed */
3933                 return false;
3934         default:
3935                 break;
3936         }
3937
3938         WARN_ON_ONCE(1);
3939         return false;
3940 }
3941
3942 void ieee80211_check_fast_rx(struct sta_info *sta)
3943 {
3944         struct ieee80211_sub_if_data *sdata = sta->sdata;
3945         struct ieee80211_local *local = sdata->local;
3946         struct ieee80211_key *key;
3947         struct ieee80211_fast_rx fastrx = {
3948                 .dev = sdata->dev,
3949                 .vif_type = sdata->vif.type,
3950                 .control_port_protocol = sdata->control_port_protocol,
3951         }, *old, *new = NULL;
3952         bool assign = false;
3953
3954         /* use sparse to check that we don't return without updating */
3955         __acquire(check_fast_rx);
3956
3957         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3958         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3959         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3960         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3961
3962         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3963
3964         /* fast-rx doesn't do reordering */
3965         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3966             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3967                 goto clear;
3968
3969         switch (sdata->vif.type) {
3970         case NL80211_IFTYPE_STATION:
3971                 if (sta->sta.tdls) {
3972                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3973                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3974                         fastrx.expected_ds_bits = 0;
3975                 } else {
3976                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3977                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3978                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3979                         fastrx.expected_ds_bits =
3980                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3981                 }
3982
3983                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3984                         fastrx.expected_ds_bits |=
3985                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3986                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3987                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3988                 }
3989
3990                 if (!sdata->u.mgd.powersave)
3991                         break;
3992
3993                 /* software powersave is a huge mess, avoid all of it */
3994                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3995                         goto clear;
3996                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3997                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3998                         goto clear;
3999                 break;
4000         case NL80211_IFTYPE_AP_VLAN:
4001         case NL80211_IFTYPE_AP:
4002                 /* parallel-rx requires this, at least with calls to
4003                  * ieee80211_sta_ps_transition()
4004                  */
4005                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4006                         goto clear;
4007                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4008                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4009                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4010
4011                 fastrx.internal_forward =
4012                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4013                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4014                          !sdata->u.vlan.sta);
4015
4016                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4017                     sdata->u.vlan.sta) {
4018                         fastrx.expected_ds_bits |=
4019                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4020                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4021                         fastrx.internal_forward = 0;
4022                 }
4023
4024                 break;
4025         default:
4026                 goto clear;
4027         }
4028
4029         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4030                 goto clear;
4031
4032         rcu_read_lock();
4033         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4034         if (key) {
4035                 switch (key->conf.cipher) {
4036                 case WLAN_CIPHER_SUITE_TKIP:
4037                         /* we don't want to deal with MMIC in fast-rx */
4038                         goto clear_rcu;
4039                 case WLAN_CIPHER_SUITE_CCMP:
4040                 case WLAN_CIPHER_SUITE_CCMP_256:
4041                 case WLAN_CIPHER_SUITE_GCMP:
4042                 case WLAN_CIPHER_SUITE_GCMP_256:
4043                         break;
4044                 default:
4045                         /* we also don't want to deal with WEP or cipher scheme
4046                          * since those require looking up the key idx in the
4047                          * frame, rather than assuming the PTK is used
4048                          * (we need to revisit this once we implement the real
4049                          * PTK index, which is now valid in the spec, but we
4050                          * haven't implemented that part yet)
4051                          */
4052                         goto clear_rcu;
4053                 }
4054
4055                 fastrx.key = true;
4056                 fastrx.icv_len = key->conf.icv_len;
4057         }
4058
4059         assign = true;
4060  clear_rcu:
4061         rcu_read_unlock();
4062  clear:
4063         __release(check_fast_rx);
4064
4065         if (assign)
4066                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4067
4068         spin_lock_bh(&sta->lock);
4069         old = rcu_dereference_protected(sta->fast_rx, true);
4070         rcu_assign_pointer(sta->fast_rx, new);
4071         spin_unlock_bh(&sta->lock);
4072
4073         if (old)
4074                 kfree_rcu(old, rcu_head);
4075 }
4076
4077 void ieee80211_clear_fast_rx(struct sta_info *sta)
4078 {
4079         struct ieee80211_fast_rx *old;
4080
4081         spin_lock_bh(&sta->lock);
4082         old = rcu_dereference_protected(sta->fast_rx, true);
4083         RCU_INIT_POINTER(sta->fast_rx, NULL);
4084         spin_unlock_bh(&sta->lock);
4085
4086         if (old)
4087                 kfree_rcu(old, rcu_head);
4088 }
4089
4090 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4091 {
4092         struct ieee80211_local *local = sdata->local;
4093         struct sta_info *sta;
4094
4095         lockdep_assert_held(&local->sta_mtx);
4096
4097         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4098                 if (sdata != sta->sdata &&
4099                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4100                         continue;
4101                 ieee80211_check_fast_rx(sta);
4102         }
4103 }
4104
4105 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4106 {
4107         struct ieee80211_local *local = sdata->local;
4108
4109         mutex_lock(&local->sta_mtx);
4110         __ieee80211_check_fast_rx_iface(sdata);
4111         mutex_unlock(&local->sta_mtx);
4112 }
4113
4114 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4115                                      struct ieee80211_fast_rx *fast_rx)
4116 {
4117         struct sk_buff *skb = rx->skb;
4118         struct ieee80211_hdr *hdr = (void *)skb->data;
4119         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4120         struct sta_info *sta = rx->sta;
4121         int orig_len = skb->len;
4122         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4123         int snap_offs = hdrlen;
4124         struct {
4125                 u8 snap[sizeof(rfc1042_header)];
4126                 __be16 proto;
4127         } *payload __aligned(2);
4128         struct {
4129                 u8 da[ETH_ALEN];
4130                 u8 sa[ETH_ALEN];
4131         } addrs __aligned(2);
4132         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4133
4134         if (fast_rx->uses_rss)
4135                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4136
4137         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4138          * to a common data structure; drivers can implement that per queue
4139          * but we don't have that information in mac80211
4140          */
4141         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4142                 return false;
4143
4144 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4145
4146         /* If using encryption, we also need to have:
4147          *  - PN_VALIDATED: similar, but the implementation is tricky
4148          *  - DECRYPTED: necessary for PN_VALIDATED
4149          */
4150         if (fast_rx->key &&
4151             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4152                 return false;
4153
4154         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4155                 return false;
4156
4157         if (unlikely(ieee80211_is_frag(hdr)))
4158                 return false;
4159
4160         /* Since our interface address cannot be multicast, this
4161          * implicitly also rejects multicast frames without the
4162          * explicit check.
4163          *
4164          * We shouldn't get any *data* frames not addressed to us
4165          * (AP mode will accept multicast *management* frames), but
4166          * punting here will make it go through the full checks in
4167          * ieee80211_accept_frame().
4168          */
4169         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4170                 return false;
4171
4172         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4173                                               IEEE80211_FCTL_TODS)) !=
4174             fast_rx->expected_ds_bits)
4175                 return false;
4176
4177         /* assign the key to drop unencrypted frames (later)
4178          * and strip the IV/MIC if necessary
4179          */
4180         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4181                 /* GCMP header length is the same */
4182                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4183         }
4184
4185         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4186                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4187                         goto drop;
4188
4189                 payload = (void *)(skb->data + snap_offs);
4190
4191                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4192                         return false;
4193
4194                 /* Don't handle these here since they require special code.
4195                  * Accept AARP and IPX even though they should come with a
4196                  * bridge-tunnel header - but if we get them this way then
4197                  * there's little point in discarding them.
4198                  */
4199                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4200                              payload->proto == fast_rx->control_port_protocol))
4201                         return false;
4202         }
4203
4204         /* after this point, don't punt to the slowpath! */
4205
4206         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4207             pskb_trim(skb, skb->len - fast_rx->icv_len))
4208                 goto drop;
4209
4210         if (unlikely(fast_rx->sta_notify)) {
4211                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4212                 fast_rx->sta_notify = false;
4213         }
4214
4215         /* statistics part of ieee80211_rx_h_sta_process() */
4216         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4217                 stats->last_signal = status->signal;
4218                 if (!fast_rx->uses_rss)
4219                         ewma_signal_add(&sta->rx_stats_avg.signal,
4220                                         -status->signal);
4221         }
4222
4223         if (status->chains) {
4224                 int i;
4225
4226                 stats->chains = status->chains;
4227                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4228                         int signal = status->chain_signal[i];
4229
4230                         if (!(status->chains & BIT(i)))
4231                                 continue;
4232
4233                         stats->chain_signal_last[i] = signal;
4234                         if (!fast_rx->uses_rss)
4235                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4236                                                 -signal);
4237                 }
4238         }
4239         /* end of statistics */
4240
4241         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4242                 goto drop;
4243
4244         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4245                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4246                     RX_QUEUED)
4247                         goto drop;
4248
4249                 return true;
4250         }
4251
4252         stats->last_rx = jiffies;
4253         stats->last_rate = sta_stats_encode_rate(status);
4254
4255         stats->fragments++;
4256         stats->packets++;
4257
4258         /* do the header conversion - first grab the addresses */
4259         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4260         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4261         /* remove the SNAP but leave the ethertype */
4262         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4263         /* push the addresses in front */
4264         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4265
4266         skb->dev = fast_rx->dev;
4267
4268         ieee80211_rx_stats(fast_rx->dev, skb->len);
4269
4270         /* The seqno index has the same property as needed
4271          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4272          * for non-QoS-data frames. Here we know it's a data
4273          * frame, so count MSDUs.
4274          */
4275         u64_stats_update_begin(&stats->syncp);
4276         stats->msdu[rx->seqno_idx]++;
4277         stats->bytes += orig_len;
4278         u64_stats_update_end(&stats->syncp);
4279
4280         if (fast_rx->internal_forward) {
4281                 struct sk_buff *xmit_skb = NULL;
4282                 if (is_multicast_ether_addr(addrs.da)) {
4283                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4284                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4285                            sta_info_get(rx->sdata, addrs.da)) {
4286                         xmit_skb = skb;
4287                         skb = NULL;
4288                 }
4289
4290                 if (xmit_skb) {
4291                         /*
4292                          * Send to wireless media and increase priority by 256
4293                          * to keep the received priority instead of
4294                          * reclassifying the frame (see cfg80211_classify8021d).
4295                          */
4296                         xmit_skb->priority += 256;
4297                         xmit_skb->protocol = htons(ETH_P_802_3);
4298                         skb_reset_network_header(xmit_skb);
4299                         skb_reset_mac_header(xmit_skb);
4300                         dev_queue_xmit(xmit_skb);
4301                 }
4302
4303                 if (!skb)
4304                         return true;
4305         }
4306
4307         /* deliver to local stack */
4308         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4309         memset(skb->cb, 0, sizeof(skb->cb));
4310         if (rx->napi)
4311                 napi_gro_receive(rx->napi, skb);
4312         else
4313                 netif_receive_skb(skb);
4314
4315         return true;
4316  drop:
4317         dev_kfree_skb(skb);
4318         stats->dropped++;
4319         return true;
4320 }
4321
4322 /*
4323  * This function returns whether or not the SKB
4324  * was destined for RX processing or not, which,
4325  * if consume is true, is equivalent to whether
4326  * or not the skb was consumed.
4327  */
4328 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4329                                             struct sk_buff *skb, bool consume)
4330 {
4331         struct ieee80211_local *local = rx->local;
4332         struct ieee80211_sub_if_data *sdata = rx->sdata;
4333
4334         rx->skb = skb;
4335
4336         /* See if we can do fast-rx; if we have to copy we already lost,
4337          * so punt in that case. We should never have to deliver a data
4338          * frame to multiple interfaces anyway.
4339          *
4340          * We skip the ieee80211_accept_frame() call and do the necessary
4341          * checking inside ieee80211_invoke_fast_rx().
4342          */
4343         if (consume && rx->sta) {
4344                 struct ieee80211_fast_rx *fast_rx;
4345
4346                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4347                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4348                         return true;
4349         }
4350
4351         if (!ieee80211_accept_frame(rx))
4352                 return false;
4353
4354         if (!consume) {
4355                 skb = skb_copy(skb, GFP_ATOMIC);
4356                 if (!skb) {
4357                         if (net_ratelimit())
4358                                 wiphy_debug(local->hw.wiphy,
4359                                         "failed to copy skb for %s\n",
4360                                         sdata->name);
4361                         return true;
4362                 }
4363
4364                 rx->skb = skb;
4365         }
4366
4367         ieee80211_invoke_rx_handlers(rx);
4368         return true;
4369 }
4370
4371 /*
4372  * This is the actual Rx frames handler. as it belongs to Rx path it must
4373  * be called with rcu_read_lock protection.
4374  */
4375 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4376                                          struct ieee80211_sta *pubsta,
4377                                          struct sk_buff *skb,
4378                                          struct napi_struct *napi)
4379 {
4380         struct ieee80211_local *local = hw_to_local(hw);
4381         struct ieee80211_sub_if_data *sdata;
4382         struct ieee80211_hdr *hdr;
4383         __le16 fc;
4384         struct ieee80211_rx_data rx;
4385         struct ieee80211_sub_if_data *prev;
4386         struct rhlist_head *tmp;
4387         int err = 0;
4388
4389         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4390         memset(&rx, 0, sizeof(rx));
4391         rx.skb = skb;
4392         rx.local = local;
4393         rx.napi = napi;
4394
4395         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4396                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4397
4398         if (ieee80211_is_mgmt(fc)) {
4399                 /* drop frame if too short for header */
4400                 if (skb->len < ieee80211_hdrlen(fc))
4401                         err = -ENOBUFS;
4402                 else
4403                         err = skb_linearize(skb);
4404         } else {
4405                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4406         }
4407
4408         if (err) {
4409                 dev_kfree_skb(skb);
4410                 return;
4411         }
4412
4413         hdr = (struct ieee80211_hdr *)skb->data;
4414         ieee80211_parse_qos(&rx);
4415         ieee80211_verify_alignment(&rx);
4416
4417         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4418                      ieee80211_is_beacon(hdr->frame_control)))
4419                 ieee80211_scan_rx(local, skb);
4420
4421         if (ieee80211_is_data(fc)) {
4422                 struct sta_info *sta, *prev_sta;
4423
4424                 if (pubsta) {
4425                         rx.sta = container_of(pubsta, struct sta_info, sta);
4426                         rx.sdata = rx.sta->sdata;
4427                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4428                                 return;
4429                         goto out;
4430                 }
4431
4432                 prev_sta = NULL;
4433
4434                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4435                         if (!prev_sta) {
4436                                 prev_sta = sta;
4437                                 continue;
4438                         }
4439
4440                         rx.sta = prev_sta;
4441                         rx.sdata = prev_sta->sdata;
4442                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4443
4444                         prev_sta = sta;
4445                 }
4446
4447                 if (prev_sta) {
4448                         rx.sta = prev_sta;
4449                         rx.sdata = prev_sta->sdata;
4450
4451                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4452                                 return;
4453                         goto out;
4454                 }
4455         }
4456
4457         prev = NULL;
4458
4459         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4460                 if (!ieee80211_sdata_running(sdata))
4461                         continue;
4462
4463                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4464                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4465                         continue;
4466
4467                 /*
4468                  * frame is destined for this interface, but if it's
4469                  * not also for the previous one we handle that after
4470                  * the loop to avoid copying the SKB once too much
4471                  */
4472
4473                 if (!prev) {
4474                         prev = sdata;
4475                         continue;
4476                 }
4477
4478                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4479                 rx.sdata = prev;
4480                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4481
4482                 prev = sdata;
4483         }
4484
4485         if (prev) {
4486                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4487                 rx.sdata = prev;
4488
4489                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4490                         return;
4491         }
4492
4493  out:
4494         dev_kfree_skb(skb);
4495 }
4496
4497 /*
4498  * This is the receive path handler. It is called by a low level driver when an
4499  * 802.11 MPDU is received from the hardware.
4500  */
4501 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4502                        struct sk_buff *skb, struct napi_struct *napi)
4503 {
4504         struct ieee80211_local *local = hw_to_local(hw);
4505         struct ieee80211_rate *rate = NULL;
4506         struct ieee80211_supported_band *sband;
4507         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4508
4509         WARN_ON_ONCE(softirq_count() == 0);
4510
4511         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4512                 goto drop;
4513
4514         sband = local->hw.wiphy->bands[status->band];
4515         if (WARN_ON(!sband))
4516                 goto drop;
4517
4518         /*
4519          * If we're suspending, it is possible although not too likely
4520          * that we'd be receiving frames after having already partially
4521          * quiesced the stack. We can't process such frames then since
4522          * that might, for example, cause stations to be added or other
4523          * driver callbacks be invoked.
4524          */
4525         if (unlikely(local->quiescing || local->suspended))
4526                 goto drop;
4527
4528         /* We might be during a HW reconfig, prevent Rx for the same reason */
4529         if (unlikely(local->in_reconfig))
4530                 goto drop;
4531
4532         /*
4533          * The same happens when we're not even started,
4534          * but that's worth a warning.
4535          */
4536         if (WARN_ON(!local->started))
4537                 goto drop;
4538
4539         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4540                 /*
4541                  * Validate the rate, unless a PLCP error means that
4542                  * we probably can't have a valid rate here anyway.
4543                  */
4544
4545                 switch (status->encoding) {
4546                 case RX_ENC_HT:
4547                         /*
4548                          * rate_idx is MCS index, which can be [0-76]
4549                          * as documented on:
4550                          *
4551                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4552                          *
4553                          * Anything else would be some sort of driver or
4554                          * hardware error. The driver should catch hardware
4555                          * errors.
4556                          */
4557                         if (WARN(status->rate_idx > 76,
4558                                  "Rate marked as an HT rate but passed "
4559                                  "status->rate_idx is not "
4560                                  "an MCS index [0-76]: %d (0x%02x)\n",
4561                                  status->rate_idx,
4562                                  status->rate_idx))
4563                                 goto drop;
4564                         break;
4565                 case RX_ENC_VHT:
4566                         if (WARN_ONCE(status->rate_idx > 9 ||
4567                                       !status->nss ||
4568                                       status->nss > 8,
4569                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4570                                       status->rate_idx, status->nss))
4571                                 goto drop;
4572                         break;
4573                 case RX_ENC_HE:
4574                         if (WARN_ONCE(status->rate_idx > 11 ||
4575                                       !status->nss ||
4576                                       status->nss > 8,
4577                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4578                                       status->rate_idx, status->nss))
4579                                 goto drop;
4580                         break;
4581                 default:
4582                         WARN_ON_ONCE(1);
4583                         /* fall through */
4584                 case RX_ENC_LEGACY:
4585                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4586                                 goto drop;
4587                         rate = &sband->bitrates[status->rate_idx];
4588                 }
4589         }
4590
4591         status->rx_flags = 0;
4592
4593         /*
4594          * key references and virtual interfaces are protected using RCU
4595          * and this requires that we are in a read-side RCU section during
4596          * receive processing
4597          */
4598         rcu_read_lock();
4599
4600         /*
4601          * Frames with failed FCS/PLCP checksum are not returned,
4602          * all other frames are returned without radiotap header
4603          * if it was previously present.
4604          * Also, frames with less than 16 bytes are dropped.
4605          */
4606         skb = ieee80211_rx_monitor(local, skb, rate);
4607         if (!skb) {
4608                 rcu_read_unlock();
4609                 return;
4610         }
4611
4612         ieee80211_tpt_led_trig_rx(local,
4613                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4614                         skb->len);
4615
4616         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4617
4618         rcu_read_unlock();
4619
4620         return;
4621  drop:
4622         kfree_skb(skb);
4623 }
4624 EXPORT_SYMBOL(ieee80211_rx_napi);
4625
4626 /* This is a version of the rx handler that can be called from hard irq
4627  * context. Post the skb on the queue and schedule the tasklet */
4628 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4629 {
4630         struct ieee80211_local *local = hw_to_local(hw);
4631
4632         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4633
4634         skb->pkt_type = IEEE80211_RX_MSG;
4635         skb_queue_tail(&local->skb_queue, skb);
4636         tasklet_schedule(&local->tasklet);
4637 }
4638 EXPORT_SYMBOL(ieee80211_rx_irqsafe);