net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/jiffies.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/export.h>
  23 #include <linux/bitops.h>
  24 #include <net/mac80211.h>
  25 #include <net/ieee80211_radiotap.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "led.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "rate.h"
  37
  38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  39 {
  40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  41
  42         u64_stats_update_begin(&tstats->syncp);
  43         tstats->rx_packets++;
  44         tstats->rx_bytes += len;
  45         u64_stats_update_end(&tstats->syncp);
  46 }
  47
  48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                                enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53         if (ieee80211_is_data(fc)) {
  54                 if (len < 24) /* drop incorrect hdr len (data) */
  55                         return NULL;
  56
  57                 if (ieee80211_has_a4(fc))
  58                         return NULL;
  59                 if (ieee80211_has_tods(fc))
  60                         return hdr->addr1;
  61                 if (ieee80211_has_fromds(fc))
  62                         return hdr->addr2;
  63
  64                 return hdr->addr3;
  65         }
  66
  67         if (ieee80211_is_mgmt(fc)) {
  68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  69                         return NULL;
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_ctl(fc)) {
  74                 if (ieee80211_is_pspoll(fc))
  75                         return hdr->addr1;
  76
  77                 if (ieee80211_is_back_req(fc)) {
  78                         switch (type) {
  79                         case NL80211_IFTYPE_STATION:
  80                                 return hdr->addr2;
  81                         case NL80211_IFTYPE_AP:
  82                         case NL80211_IFTYPE_AP_VLAN:
  83                                 return hdr->addr1;
  84                         default:
  85                                 break; /* fall through to the return */
  86                         }
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94  * monitor mode reception
  95  *
  96  * This function cleans up the SKB, i.e. it removes all the stuff
  97  * only useful for monitoring.
  98  */
  99 static void remove_monitor_info(struct sk_buff *skb,
 100                                 unsigned int present_fcs_len,
 101                                 unsigned int rtap_space)
 102 {
 103         if (present_fcs_len)
 104                 __pskb_trim(skb, skb->len - present_fcs_len);
 105         __pskb_pull(skb, rtap_space);
 106 }
 107
 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 109                                      unsigned int rtap_space)
 110 {
 111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 112         struct ieee80211_hdr *hdr;
 113
 114         hdr = (void *)(skb->data + rtap_space);
 115
 116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 117                             RX_FLAG_FAILED_PLCP_CRC |
 118                             RX_FLAG_ONLY_MONITOR |
 119                             RX_FLAG_NO_PSDU))
 120                 return true;
 121
 122         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 123                 return true;
 124
 125         if (ieee80211_is_ctl(hdr->frame_control) &&
 126             !ieee80211_is_pspoll(hdr->frame_control) &&
 127             !ieee80211_is_back_req(hdr->frame_control))
 128                 return true;
 129
 130         return false;
 131 }
 132
 133 static int
 134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 135                              struct ieee80211_rx_status *status,
 136                              struct sk_buff *skb)
 137 {
 138         int len;
 139
 140         /* always present fields */
 141         len = sizeof(struct ieee80211_radiotap_header) + 8;
 142
 143         /* allocate extra bitmaps */
 144         if (status->chains)
 145                 len += 4 * hweight8(status->chains);
 146         /* 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 = (void *)skb->data;
 212
 213                 /* alignment for fixed 6-byte vendor data header */
 214                 len = ALIGN(len, 2);
 215                 /* vendor data header */
 216                 len += 6;
 217                 if (WARN_ON(rtap->align == 0))
 218                         rtap->align = 1;
 219                 len = ALIGN(len, rtap->align);
 220                 len += rtap->len + rtap->pad;
 221         }
 222
 223         return len;
 224 }
 225
 226 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 227                                          struct sk_buff *skb,
 228                                          int rtap_space)
 229 {
 230         struct {
 231                 struct ieee80211_hdr_3addr hdr;
 232                 u8 category;
 233                 u8 action_code;
 234         } __packed action;
 235
 236         if (!sdata)
 237                 return;
 238
 239         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 240
 241         if (skb->len < rtap_space + sizeof(action) +
 242                        VHT_MUMIMO_GROUPS_DATA_LEN)
 243                 return;
 244
 245         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 246                 return;
 247
 248         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 249
 250         if (!ieee80211_is_action(action.hdr.frame_control))
 251                 return;
 252
 253         if (action.category != WLAN_CATEGORY_VHT)
 254                 return;
 255
 256         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 257                 return;
 258
 259         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 260                 return;
 261
 262         skb = skb_copy(skb, GFP_ATOMIC);
 263         if (!skb)
 264                 return;
 265
 266         skb_queue_tail(&sdata->skb_queue, skb);
 267         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 268 }
 269
 270 /*
 271  * ieee80211_add_rx_radiotap_header - add radiotap header
 272  *
 273  * add a radiotap header containing all the fields which the hardware provided.
 274  */
 275 static void
 276 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 277                                  struct sk_buff *skb,
 278                                  struct ieee80211_rate *rate,
 279                                  int rtap_len, bool has_fcs)
 280 {
 281         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 282         struct ieee80211_radiotap_header *rthdr;
 283         unsigned char *pos;
 284         __le32 *it_present;
 285         u32 it_present_val;
 286         u16 rx_flags = 0;
 287         u16 channel_flags = 0;
 288         int mpdulen, chain;
 289         unsigned long chains = status->chains;
 290         struct ieee80211_vendor_radiotap rtap = {};
 291         struct ieee80211_radiotap_he he = {};
 292         struct ieee80211_radiotap_he_mu he_mu = {};
 293         struct ieee80211_radiotap_lsig lsig = {};
 294
 295         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 296                 he = *(struct ieee80211_radiotap_he *)skb->data;
 297                 skb_pull(skb, sizeof(he));
 298                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 299         }
 300
 301         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 302                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 303                 skb_pull(skb, sizeof(he_mu));
 304         }
 305
 306         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 307                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 308                 skb_pull(skb, sizeof(lsig));
 309         }
 310
 311         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 312                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 313                 /* rtap.len and rtap.pad are undone immediately */
 314                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 315         }
 316
 317         mpdulen = skb->len;
 318         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 319                 mpdulen += FCS_LEN;
 320
 321         rthdr = skb_push(skb, rtap_len);
 322         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 323         it_present = &rthdr->it_present;
 324
 325         /* radiotap header, set always present flags */
 326         rthdr->it_len = cpu_to_le16(rtap_len);
 327         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 328                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 329                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 330
 331         if (!status->chains)
 332                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 333
 334         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 335                 it_present_val |=
 336                         BIT(IEEE80211_RADIOTAP_EXT) |
 337                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 338                 put_unaligned_le32(it_present_val, it_present);
 339                 it_present++;
 340                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 341                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 342         }
 343
 344         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 345                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 346                                   BIT(IEEE80211_RADIOTAP_EXT);
 347                 put_unaligned_le32(it_present_val, it_present);
 348                 it_present++;
 349                 it_present_val = rtap.present;
 350         }
 351
 352         put_unaligned_le32(it_present_val, it_present);
 353
 354         pos = (void *)(it_present + 1);
 355
 356         /* the order of the following fields is important */
 357
 358         /* IEEE80211_RADIOTAP_TSFT */
 359         if (ieee80211_have_rx_timestamp(status)) {
 360                 /* padding */
 361                 while ((pos - (u8 *)rthdr) & 7)
 362                         *pos++ = 0;
 363                 put_unaligned_le64(
 364                         ieee80211_calculate_rx_timestamp(local, status,
 365                                                          mpdulen, 0),
 366                         pos);
 367                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 368                 pos += 8;
 369         }
 370
 371         /* IEEE80211_RADIOTAP_FLAGS */
 372         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 373                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 374         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 375                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 376         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 377                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 378         pos++;
 379
 380         /* IEEE80211_RADIOTAP_RATE */
 381         if (!rate || status->encoding != RX_ENC_LEGACY) {
 382                 /*
 383                  * Without rate information don't add it. If we have,
 384                  * MCS information is a separate field in radiotap,
 385                  * added below. The byte here is needed as padding
 386                  * for the channel though, so initialise it to 0.
 387                  */
 388                 *pos = 0;
 389         } else {
 390                 int shift = 0;
 391                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 392                 if (status->bw == RATE_INFO_BW_10)
 393                         shift = 1;
 394                 else if (status->bw == RATE_INFO_BW_5)
 395                         shift = 2;
 396                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 397         }
 398         pos++;
 399
 400         /* IEEE80211_RADIOTAP_CHANNEL */
 401         put_unaligned_le16(status->freq, pos);
 402         pos += 2;
 403         if (status->bw == RATE_INFO_BW_10)
 404                 channel_flags |= IEEE80211_CHAN_HALF;
 405         else if (status->bw == RATE_INFO_BW_5)
 406                 channel_flags |= IEEE80211_CHAN_QUARTER;
 407
 408         if (status->band == NL80211_BAND_5GHZ)
 409                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 410         else if (status->encoding != RX_ENC_LEGACY)
 411                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 412         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 413                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 414         else if (rate)
 415                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 416         else
 417                 channel_flags |= IEEE80211_CHAN_2GHZ;
 418         put_unaligned_le16(channel_flags, pos);
 419         pos += 2;
 420
 421         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 422         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 423             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 424                 *pos = status->signal;
 425                 rthdr->it_present |=
 426                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 427                 pos++;
 428         }
 429
 430         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 431
 432         if (!status->chains) {
 433                 /* IEEE80211_RADIOTAP_ANTENNA */
 434                 *pos = status->antenna;
 435                 pos++;
 436         }
 437
 438         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 439
 440         /* IEEE80211_RADIOTAP_RX_FLAGS */
 441         /* ensure 2 byte alignment for the 2 byte field as required */
 442         if ((pos - (u8 *)rthdr) & 1)
 443                 *pos++ = 0;
 444         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 445                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 446         put_unaligned_le16(rx_flags, pos);
 447         pos += 2;
 448
 449         if (status->encoding == RX_ENC_HT) {
 450                 unsigned int stbc;
 451
 452                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 453                 *pos++ = local->hw.radiotap_mcs_details;
 454                 *pos = 0;
 455                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 456                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 457                 if (status->bw == RATE_INFO_BW_40)
 458                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 459                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 460                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 461                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 462                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 463                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 464                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 465                 pos++;
 466                 *pos++ = status->rate_idx;
 467         }
 468
 469         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 470                 u16 flags = 0;
 471
 472                 /* ensure 4 byte alignment */
 473                 while ((pos - (u8 *)rthdr) & 3)
 474                         pos++;
 475                 rthdr->it_present |=
 476                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 477                 put_unaligned_le32(status->ampdu_reference, pos);
 478                 pos += 4;
 479                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 480                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 481                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 482                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 483                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 484                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 485                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 486                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 487                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 488                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 489                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 490                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 491                 put_unaligned_le16(flags, pos);
 492                 pos += 2;
 493                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 494                         *pos++ = status->ampdu_delimiter_crc;
 495                 else
 496                         *pos++ = 0;
 497                 *pos++ = 0;
 498         }
 499
 500         if (status->encoding == RX_ENC_VHT) {
 501                 u16 known = local->hw.radiotap_vht_details;
 502
 503                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 504                 put_unaligned_le16(known, pos);
 505                 pos += 2;
 506                 /* flags */
 507                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 508                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 509                 /* in VHT, STBC is binary */
 510                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 511                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 512                 if (status->enc_flags & RX_ENC_FLAG_BF)
 513                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 514                 pos++;
 515                 /* bandwidth */
 516                 switch (status->bw) {
 517                 case RATE_INFO_BW_80:
 518                         *pos++ = 4;
 519                         break;
 520                 case RATE_INFO_BW_160:
 521                         *pos++ = 11;
 522                         break;
 523                 case RATE_INFO_BW_40:
 524                         *pos++ = 1;
 525                         break;
 526                 default:
 527                         *pos++ = 0;
 528                 }
 529                 /* MCS/NSS */
 530                 *pos = (status->rate_idx << 4) | status->nss;
 531                 pos += 4;
 532                 /* coding field */
 533                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 534                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 535                 pos++;
 536                 /* group ID */
 537                 pos++;
 538                 /* partial_aid */
 539                 pos += 2;
 540         }
 541
 542         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 543                 u16 accuracy = 0;
 544                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 545
 546                 rthdr->it_present |=
 547                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 548
 549                 /* ensure 8 byte alignment */
 550                 while ((pos - (u8 *)rthdr) & 7)
 551                         pos++;
 552
 553                 put_unaligned_le64(status->device_timestamp, pos);
 554                 pos += sizeof(u64);
 555
 556                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 557                         accuracy = local->hw.radiotap_timestamp.accuracy;
 558                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 559                 }
 560                 put_unaligned_le16(accuracy, pos);
 561                 pos += sizeof(u16);
 562
 563                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 564                 *pos++ = flags;
 565         }
 566
 567         if (status->encoding == RX_ENC_HE &&
 568             status->flag & RX_FLAG_RADIOTAP_HE) {
 569 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 570
 571                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 572                         he.data6 |= HE_PREP(DATA6_NSTS,
 573                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 574                                                       status->enc_flags));
 575                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 576                 } else {
 577                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 578                 }
 579
 580 #define CHECK_GI(s) \
 581         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 582                      (int)NL80211_RATE_INFO_HE_GI_##s)
 583
 584                 CHECK_GI(0_8);
 585                 CHECK_GI(1_6);
 586                 CHECK_GI(3_2);
 587
 588                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 589                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 590                 he.data3 |= HE_PREP(DATA3_CODING,
 591                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 592
 593                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 594
 595                 switch (status->bw) {
 596                 case RATE_INFO_BW_20:
 597                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 598                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 599                         break;
 600                 case RATE_INFO_BW_40:
 601                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 602                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 603                         break;
 604                 case RATE_INFO_BW_80:
 605                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 606                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 607                         break;
 608                 case RATE_INFO_BW_160:
 609                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 610                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 611                         break;
 612                 case RATE_INFO_BW_HE_RU:
 613 #define CHECK_RU_ALLOC(s) \
 614         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 615                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 616
 617                         CHECK_RU_ALLOC(26);
 618                         CHECK_RU_ALLOC(52);
 619                         CHECK_RU_ALLOC(106);
 620                         CHECK_RU_ALLOC(242);
 621                         CHECK_RU_ALLOC(484);
 622                         CHECK_RU_ALLOC(996);
 623                         CHECK_RU_ALLOC(2x996);
 624
 625                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 626                                             status->he_ru + 4);
 627                         break;
 628                 default:
 629                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 630                 }
 631
 632                 /* ensure 2 byte alignment */
 633                 while ((pos - (u8 *)rthdr) & 1)
 634                         pos++;
 635                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 636                 memcpy(pos, &he, sizeof(he));
 637                 pos += sizeof(he);
 638         }
 639
 640         if (status->encoding == RX_ENC_HE &&
 641             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 642                 /* ensure 2 byte alignment */
 643                 while ((pos - (u8 *)rthdr) & 1)
 644                         pos++;
 645                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 646                 memcpy(pos, &he_mu, sizeof(he_mu));
 647                 pos += sizeof(he_mu);
 648         }
 649
 650         if (status->flag & RX_FLAG_NO_PSDU) {
 651                 rthdr->it_present |=
 652                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 653                 *pos++ = status->zero_length_psdu_type;
 654         }
 655
 656         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 657                 /* ensure 2 byte alignment */
 658                 while ((pos - (u8 *)rthdr) & 1)
 659                         pos++;
 660                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 661                 memcpy(pos, &lsig, sizeof(lsig));
 662                 pos += sizeof(lsig);
 663         }
 664
 665         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 666                 *pos++ = status->chain_signal[chain];
 667                 *pos++ = chain;
 668         }
 669
 670         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 671                 /* ensure 2 byte alignment for the vendor field as required */
 672                 if ((pos - (u8 *)rthdr) & 1)
 673                         *pos++ = 0;
 674                 *pos++ = rtap.oui[0];
 675                 *pos++ = rtap.oui[1];
 676                 *pos++ = rtap.oui[2];
 677                 *pos++ = rtap.subns;
 678                 put_unaligned_le16(rtap.len, pos);
 679                 pos += 2;
 680                 /* align the actual payload as requested */
 681                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 682                         *pos++ = 0;
 683                 /* data (and possible padding) already follows */
 684         }
 685 }
 686
 687 static struct sk_buff *
 688 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 689                            struct sk_buff **origskb,
 690                            struct ieee80211_rate *rate,
 691                            int rtap_space, bool use_origskb)
 692 {
 693         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 694         int rt_hdrlen, needed_headroom;
 695         struct sk_buff *skb;
 696
 697         /* room for the radiotap header based on driver features */
 698         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 699         needed_headroom = rt_hdrlen - rtap_space;
 700
 701         if (use_origskb) {
 702                 /* only need to expand headroom if necessary */
 703                 skb = *origskb;
 704                 *origskb = NULL;
 705
 706                 /*
 707                  * This shouldn't trigger often because most devices have an
 708                  * RX header they pull before we get here, and that should
 709                  * be big enough for our radiotap information. We should
 710                  * probably export the length to drivers so that we can have
 711                  * them allocate enough headroom to start with.
 712                  */
 713                 if (skb_headroom(skb) < needed_headroom &&
 714                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 715                         dev_kfree_skb(skb);
 716                         return NULL;
 717                 }
 718         } else {
 719                 /*
 720                  * Need to make a copy and possibly remove radiotap header
 721                  * and FCS from the original.
 722                  */
 723                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 724
 725                 if (!skb)
 726                         return NULL;
 727         }
 728
 729         /* prepend radiotap information */
 730         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 731
 732         skb_reset_mac_header(skb);
 733         skb->ip_summed = CHECKSUM_UNNECESSARY;
 734         skb->pkt_type = PACKET_OTHERHOST;
 735         skb->protocol = htons(ETH_P_802_2);
 736
 737         return skb;
 738 }
 739
 740 /*
 741  * This function copies a received frame to all monitor interfaces and
 742  * returns a cleaned-up SKB that no longer includes the FCS nor the
 743  * radiotap header the driver might have added.
 744  */
 745 static struct sk_buff *
 746 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 747                      struct ieee80211_rate *rate)
 748 {
 749         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 750         struct ieee80211_sub_if_data *sdata;
 751         struct sk_buff *monskb = NULL;
 752         int present_fcs_len = 0;
 753         unsigned int rtap_space = 0;
 754         struct ieee80211_sub_if_data *monitor_sdata =
 755                 rcu_dereference(local->monitor_sdata);
 756         bool only_monitor = false;
 757         unsigned int min_head_len;
 758
 759         if (status->flag & RX_FLAG_RADIOTAP_HE)
 760                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 761
 762         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 763                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 764
 765         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 766                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 767
 768         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 769                 struct ieee80211_vendor_radiotap *rtap =
 770                         (void *)(origskb->data + rtap_space);
 771
 772                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 773         }
 774
 775         min_head_len = rtap_space;
 776
 777         /*
 778          * First, we may need to make a copy of the skb because
 779          *  (1) we need to modify it for radiotap (if not present), and
 780          *  (2) the other RX handlers will modify the skb we got.
 781          *
 782          * We don't need to, of course, if we aren't going to return
 783          * the SKB because it has a bad FCS/PLCP checksum.
 784          */
 785
 786         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 787                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 788                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 789                                 /* driver bug */
 790                                 WARN_ON(1);
 791                                 dev_kfree_skb(origskb);
 792                                 return NULL;
 793                         }
 794                         present_fcs_len = FCS_LEN;
 795                 }
 796
 797                 /* also consider the hdr->frame_control */
 798                 min_head_len += 2;
 799         }
 800
 801         /* ensure that the expected data elements are in skb head */
 802         if (!pskb_may_pull(origskb, min_head_len)) {
 803                 dev_kfree_skb(origskb);
 804                 return NULL;
 805         }
 806
 807         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 808
 809         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 810                 if (only_monitor) {
 811                         dev_kfree_skb(origskb);
 812                         return NULL;
 813                 }
 814
 815                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 816                 return origskb;
 817         }
 818
 819         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 820
 821         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 822                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 823                                                  &local->mon_list);
 824
 825                 if (!monskb)
 826                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 827                                                             rate, rtap_space,
 828                                                             only_monitor &&
 829                                                             last_monitor);
 830
 831                 if (monskb) {
 832                         struct sk_buff *skb;
 833
 834                         if (last_monitor) {
 835                                 skb = monskb;
 836                                 monskb = NULL;
 837                         } else {
 838                                 skb = skb_clone(monskb, GFP_ATOMIC);
 839                         }
 840
 841                         if (skb) {
 842                                 skb->dev = sdata->dev;
 843                                 ieee80211_rx_stats(skb->dev, skb->len);
 844                                 netif_receive_skb(skb);
 845                         }
 846                 }
 847
 848                 if (last_monitor)
 849                         break;
 850         }
 851
 852         /* this happens if last_monitor was erroneously false */
 853         dev_kfree_skb(monskb);
 854
 855         /* ditto */
 856         if (!origskb)
 857                 return NULL;
 858
 859         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 860         return origskb;
 861 }
 862
 863 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 864 {
 865         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 866         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 867         int tid, seqno_idx, security_idx;
 868
 869         /* does the frame have a qos control field? */
 870         if (ieee80211_is_data_qos(hdr->frame_control)) {
 871                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 872                 /* frame has qos control */
 873                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 874                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 875                         status->rx_flags |= IEEE80211_RX_AMSDU;
 876
 877                 seqno_idx = tid;
 878                 security_idx = tid;
 879         } else {
 880                 /*
 881                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 882                  *
 883                  *      Sequence numbers for management frames, QoS data
 884                  *      frames with a broadcast/multicast address in the
 885                  *      Address 1 field, and all non-QoS data frames sent
 886                  *      by QoS STAs are assigned using an additional single
 887                  *      modulo-4096 counter, [...]
 888                  *
 889                  * We also use that counter for non-QoS STAs.
 890                  */
 891                 seqno_idx = IEEE80211_NUM_TIDS;
 892                 security_idx = 0;
 893                 if (ieee80211_is_mgmt(hdr->frame_control))
 894                         security_idx = IEEE80211_NUM_TIDS;
 895                 tid = 0;
 896         }
 897
 898         rx->seqno_idx = seqno_idx;
 899         rx->security_idx = security_idx;
 900         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 901          * For now, set skb->priority to 0 for other cases. */
 902         rx->skb->priority = (tid > 7) ? 0 : tid;
 903 }
 904
 905 /**
 906  * DOC: Packet alignment
 907  *
 908  * Drivers always need to pass packets that are aligned to two-byte boundaries
 909  * to the stack.
 910  *
 911  * Additionally, should, if possible, align the payload data in a way that
 912  * guarantees that the contained IP header is aligned to a four-byte
 913  * boundary. In the case of regular frames, this simply means aligning the
 914  * payload to a four-byte boundary (because either the IP header is directly
 915  * contained, or IV/RFC1042 headers that have a length divisible by four are
 916  * in front of it).  If the payload data is not properly aligned and the
 917  * architecture doesn't support efficient unaligned operations, mac80211
 918  * will align the data.
 919  *
 920  * With A-MSDU frames, however, the payload data address must yield two modulo
 921  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 922  * push the IP header further back to a multiple of four again. Thankfully, the
 923  * specs were sane enough this time around to require padding each A-MSDU
 924  * subframe to a length that is a multiple of four.
 925  *
 926  * Padding like Atheros hardware adds which is between the 802.11 header and
 927  * the payload is not supported, the driver is required to move the 802.11
 928  * header to be directly in front of the payload in that case.
 929  */
 930 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 931 {
 932 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 933         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 934 #endif
 935 }
 936
 937
 938 /* rx handlers */
 939
 940 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 941 {
 942         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 943
 944         if (is_multicast_ether_addr(hdr->addr1))
 945                 return 0;
 946
 947         return ieee80211_is_robust_mgmt_frame(skb);
 948 }
 949
 950
 951 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 952 {
 953         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 954
 955         if (!is_multicast_ether_addr(hdr->addr1))
 956                 return 0;
 957
 958         return ieee80211_is_robust_mgmt_frame(skb);
 959 }
 960
 961
 962 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 963 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 964 {
 965         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 966         struct ieee80211_mmie *mmie;
 967         struct ieee80211_mmie_16 *mmie16;
 968
 969         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 970                 return -1;
 971
 972         if (!ieee80211_is_robust_mgmt_frame(skb))
 973                 return -1; /* not a robust management frame */
 974
 975         mmie = (struct ieee80211_mmie *)
 976                 (skb->data + skb->len - sizeof(*mmie));
 977         if (mmie->element_id == WLAN_EID_MMIE &&
 978             mmie->length == sizeof(*mmie) - 2)
 979                 return le16_to_cpu(mmie->key_id);
 980
 981         mmie16 = (struct ieee80211_mmie_16 *)
 982                 (skb->data + skb->len - sizeof(*mmie16));
 983         if (skb->len >= 24 + sizeof(*mmie16) &&
 984             mmie16->element_id == WLAN_EID_MMIE &&
 985             mmie16->length == sizeof(*mmie16) - 2)
 986                 return le16_to_cpu(mmie16->key_id);
 987
 988         return -1;
 989 }
 990
 991 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 992                                   struct sk_buff *skb)
 993 {
 994         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 995         __le16 fc;
 996         int hdrlen;
 997         u8 keyid;
 998
 999         fc = hdr->frame_control;
1000         hdrlen = ieee80211_hdrlen(fc);
1001
1002         if (skb->len < hdrlen + cs->hdr_len)
1003                 return -EINVAL;
1004
1005         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
1006         keyid &= cs->key_idx_mask;
1007         keyid >>= cs->key_idx_shift;
1008
1009         return keyid;
1010 }
1011
1012 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1013 {
1014         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1015         char *dev_addr = rx->sdata->vif.addr;
1016
1017         if (ieee80211_is_data(hdr->frame_control)) {
1018                 if (is_multicast_ether_addr(hdr->addr1)) {
1019                         if (ieee80211_has_tods(hdr->frame_control) ||
1020                             !ieee80211_has_fromds(hdr->frame_control))
1021                                 return RX_DROP_MONITOR;
1022                         if (ether_addr_equal(hdr->addr3, dev_addr))
1023                                 return RX_DROP_MONITOR;
1024                 } else {
1025                         if (!ieee80211_has_a4(hdr->frame_control))
1026                                 return RX_DROP_MONITOR;
1027                         if (ether_addr_equal(hdr->addr4, dev_addr))
1028                                 return RX_DROP_MONITOR;
1029                 }
1030         }
1031
1032         /* If there is not an established peer link and this is not a peer link
1033          * establisment frame, beacon or probe, drop the frame.
1034          */
1035
1036         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1037                 struct ieee80211_mgmt *mgmt;
1038
1039                 if (!ieee80211_is_mgmt(hdr->frame_control))
1040                         return RX_DROP_MONITOR;
1041
1042                 if (ieee80211_is_action(hdr->frame_control)) {
1043                         u8 category;
1044
1045                         /* make sure category field is present */
1046                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1047                                 return RX_DROP_MONITOR;
1048
1049                         mgmt = (struct ieee80211_mgmt *)hdr;
1050                         category = mgmt->u.action.category;
1051                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1052                             category != WLAN_CATEGORY_SELF_PROTECTED)
1053                                 return RX_DROP_MONITOR;
1054                         return RX_CONTINUE;
1055                 }
1056
1057                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1058                     ieee80211_is_probe_resp(hdr->frame_control) ||
1059                     ieee80211_is_beacon(hdr->frame_control) ||
1060                     ieee80211_is_auth(hdr->frame_control))
1061                         return RX_CONTINUE;
1062
1063                 return RX_DROP_MONITOR;
1064         }
1065
1066         return RX_CONTINUE;
1067 }
1068
1069 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1070                                               int index)
1071 {
1072         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1073         struct sk_buff *tail = skb_peek_tail(frames);
1074         struct ieee80211_rx_status *status;
1075
1076         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1077                 return true;
1078
1079         if (!tail)
1080                 return false;
1081
1082         status = IEEE80211_SKB_RXCB(tail);
1083         if (status->flag & RX_FLAG_AMSDU_MORE)
1084                 return false;
1085
1086         return true;
1087 }
1088
1089 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1090                                             struct tid_ampdu_rx *tid_agg_rx,
1091                                             int index,
1092                                             struct sk_buff_head *frames)
1093 {
1094         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1095         struct sk_buff *skb;
1096         struct ieee80211_rx_status *status;
1097
1098         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1099
1100         if (skb_queue_empty(skb_list))
1101                 goto no_frame;
1102
1103         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1104                 __skb_queue_purge(skb_list);
1105                 goto no_frame;
1106         }
1107
1108         /* release frames from the reorder ring buffer */
1109         tid_agg_rx->stored_mpdu_num--;
1110         while ((skb = __skb_dequeue(skb_list))) {
1111                 status = IEEE80211_SKB_RXCB(skb);
1112                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1113                 __skb_queue_tail(frames, skb);
1114         }
1115
1116 no_frame:
1117         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1118         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1119 }
1120
1121 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1122                                              struct tid_ampdu_rx *tid_agg_rx,
1123                                              u16 head_seq_num,
1124                                              struct sk_buff_head *frames)
1125 {
1126         int index;
1127
1128         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1129
1130         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1131                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1132                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1133                                                 frames);
1134         }
1135 }
1136
1137 /*
1138  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1139  * the skb was added to the buffer longer than this time ago, the earlier
1140  * frames that have not yet been received are assumed to be lost and the skb
1141  * can be released for processing. This may also release other skb's from the
1142  * reorder buffer if there are no additional gaps between the frames.
1143  *
1144  * Callers must hold tid_agg_rx->reorder_lock.
1145  */
1146 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1147
1148 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1149                                           struct tid_ampdu_rx *tid_agg_rx,
1150                                           struct sk_buff_head *frames)
1151 {
1152         int index, i, j;
1153
1154         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1155
1156         /* release the buffer until next missing frame */
1157         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1158         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1159             tid_agg_rx->stored_mpdu_num) {
1160                 /*
1161                  * No buffers ready to be released, but check whether any
1162                  * frames in the reorder buffer have timed out.
1163                  */
1164                 int skipped = 1;
1165                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1166                      j = (j + 1) % tid_agg_rx->buf_size) {
1167                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1168                                 skipped++;
1169                                 continue;
1170                         }
1171                         if (skipped &&
1172                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1173                                         HT_RX_REORDER_BUF_TIMEOUT))
1174                                 goto set_release_timer;
1175
1176                         /* don't leave incomplete A-MSDUs around */
1177                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1178                              i = (i + 1) % tid_agg_rx->buf_size)
1179                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1180
1181                         ht_dbg_ratelimited(sdata,
1182                                            "release an RX reorder frame due to timeout on earlier frames\n");
1183                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1184                                                         frames);
1185
1186                         /*
1187                          * Increment the head seq# also for the skipped slots.
1188                          */
1189                         tid_agg_rx->head_seq_num =
1190                                 (tid_agg_rx->head_seq_num +
1191                                  skipped) & IEEE80211_SN_MASK;
1192                         skipped = 0;
1193                 }
1194         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1195                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1196                                                 frames);
1197                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1198         }
1199
1200         if (tid_agg_rx->stored_mpdu_num) {
1201                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1202
1203                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1204                      j = (j + 1) % tid_agg_rx->buf_size) {
1205                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1206                                 break;
1207                 }
1208
1209  set_release_timer:
1210
1211                 if (!tid_agg_rx->removed)
1212                         mod_timer(&tid_agg_rx->reorder_timer,
1213                                   tid_agg_rx->reorder_time[j] + 1 +
1214                                   HT_RX_REORDER_BUF_TIMEOUT);
1215         } else {
1216                 del_timer(&tid_agg_rx->reorder_timer);
1217         }
1218 }
1219
1220 /*
1221  * As this function belongs to the RX path it must be under
1222  * rcu_read_lock protection. It returns false if the frame
1223  * can be processed immediately, true if it was consumed.
1224  */
1225 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1226                                              struct tid_ampdu_rx *tid_agg_rx,
1227                                              struct sk_buff *skb,
1228                                              struct sk_buff_head *frames)
1229 {
1230         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1231         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1232         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1233         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1234         u16 head_seq_num, buf_size;
1235         int index;
1236         bool ret = true;
1237
1238         spin_lock(&tid_agg_rx->reorder_lock);
1239
1240         /*
1241          * Offloaded BA sessions have no known starting sequence number so pick
1242          * one from first Rxed frame for this tid after BA was started.
1243          */
1244         if (unlikely(tid_agg_rx->auto_seq)) {
1245                 tid_agg_rx->auto_seq = false;
1246                 tid_agg_rx->ssn = mpdu_seq_num;
1247                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1248         }
1249
1250         buf_size = tid_agg_rx->buf_size;
1251         head_seq_num = tid_agg_rx->head_seq_num;
1252
1253         /*
1254          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1255          * be reordered.
1256          */
1257         if (unlikely(!tid_agg_rx->started)) {
1258                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1259                         ret = false;
1260                         goto out;
1261                 }
1262                 tid_agg_rx->started = true;
1263         }
1264
1265         /* frame with out of date sequence number */
1266         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1267                 dev_kfree_skb(skb);
1268                 goto out;
1269         }
1270
1271         /*
1272          * If frame the sequence number exceeds our buffering window
1273          * size release some previous frames to make room for this one.
1274          */
1275         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1276                 head_seq_num = ieee80211_sn_inc(
1277                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1278                 /* release stored frames up to new head to stack */
1279                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1280                                                  head_seq_num, frames);
1281         }
1282
1283         /* Now the new frame is always in the range of the reordering buffer */
1284
1285         index = mpdu_seq_num % tid_agg_rx->buf_size;
1286
1287         /* check if we already stored this frame */
1288         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1289                 dev_kfree_skb(skb);
1290                 goto out;
1291         }
1292
1293         /*
1294          * If the current MPDU is in the right order and nothing else
1295          * is stored we can process it directly, no need to buffer it.
1296          * If it is first but there's something stored, we may be able
1297          * to release frames after this one.
1298          */
1299         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1300             tid_agg_rx->stored_mpdu_num == 0) {
1301                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1302                         tid_agg_rx->head_seq_num =
1303                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1304                 ret = false;
1305                 goto out;
1306         }
1307
1308         /* put the frame in the reordering buffer */
1309         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1310         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1311                 tid_agg_rx->reorder_time[index] = jiffies;
1312                 tid_agg_rx->stored_mpdu_num++;
1313                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1314         }
1315
1316  out:
1317         spin_unlock(&tid_agg_rx->reorder_lock);
1318         return ret;
1319 }
1320
1321 /*
1322  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1323  * true if the MPDU was buffered, false if it should be processed.
1324  */
1325 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1326                                        struct sk_buff_head *frames)
1327 {
1328         struct sk_buff *skb = rx->skb;
1329         struct ieee80211_local *local = rx->local;
1330         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1331         struct sta_info *sta = rx->sta;
1332         struct tid_ampdu_rx *tid_agg_rx;
1333         u16 sc;
1334         u8 tid, ack_policy;
1335
1336         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1337             is_multicast_ether_addr(hdr->addr1))
1338                 goto dont_reorder;
1339
1340         /*
1341          * filter the QoS data rx stream according to
1342          * STA/TID and check if this STA/TID is on aggregation
1343          */
1344
1345         if (!sta)
1346                 goto dont_reorder;
1347
1348         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1349                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1350         tid = ieee80211_get_tid(hdr);
1351
1352         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1353         if (!tid_agg_rx) {
1354                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1355                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1356                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1357                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1358                                              WLAN_BACK_RECIPIENT,
1359                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1360                 goto dont_reorder;
1361         }
1362
1363         /* qos null data frames are excluded */
1364         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1365                 goto dont_reorder;
1366
1367         /* not part of a BA session */
1368         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1369             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1370                 goto dont_reorder;
1371
1372         /* new, potentially un-ordered, ampdu frame - process it */
1373
1374         /* reset session timer */
1375         if (tid_agg_rx->timeout)
1376                 tid_agg_rx->last_rx = jiffies;
1377
1378         /* if this mpdu is fragmented - terminate rx aggregation session */
1379         sc = le16_to_cpu(hdr->seq_ctrl);
1380         if (sc & IEEE80211_SCTL_FRAG) {
1381                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1382                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1383                 return;
1384         }
1385
1386         /*
1387          * No locking needed -- we will only ever process one
1388          * RX packet at a time, and thus own tid_agg_rx. All
1389          * other code manipulating it needs to (and does) make
1390          * sure that we cannot get to it any more before doing
1391          * anything with it.
1392          */
1393         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1394                                              frames))
1395                 return;
1396
1397  dont_reorder:
1398         __skb_queue_tail(frames, skb);
1399 }
1400
1401 static ieee80211_rx_result debug_noinline
1402 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1403 {
1404         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1405         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1406
1407         if (status->flag & RX_FLAG_DUP_VALIDATED)
1408                 return RX_CONTINUE;
1409
1410         /*
1411          * Drop duplicate 802.11 retransmissions
1412          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1413          */
1414
1415         if (rx->skb->len < 24)
1416                 return RX_CONTINUE;
1417
1418         if (ieee80211_is_ctl(hdr->frame_control) ||
1419             ieee80211_is_nullfunc(hdr->frame_control) ||
1420             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1421             is_multicast_ether_addr(hdr->addr1))
1422                 return RX_CONTINUE;
1423
1424         if (!rx->sta)
1425                 return RX_CONTINUE;
1426
1427         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1428                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1429                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1430                 rx->sta->rx_stats.num_duplicates++;
1431                 return RX_DROP_UNUSABLE;
1432         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1433                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1434         }
1435
1436         return RX_CONTINUE;
1437 }
1438
1439 static ieee80211_rx_result debug_noinline
1440 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1441 {
1442         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1443
1444         /* Drop disallowed frame classes based on STA auth/assoc state;
1445          * IEEE 802.11, Chap 5.5.
1446          *
1447          * mac80211 filters only based on association state, i.e. it drops
1448          * Class 3 frames from not associated stations. hostapd sends
1449          * deauth/disassoc frames when needed. In addition, hostapd is
1450          * responsible for filtering on both auth and assoc states.
1451          */
1452
1453         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1454                 return ieee80211_rx_mesh_check(rx);
1455
1456         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1457                       ieee80211_is_pspoll(hdr->frame_control)) &&
1458                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1459                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1460                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1461                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1462                 /*
1463                  * accept port control frames from the AP even when it's not
1464                  * yet marked ASSOC to prevent a race where we don't set the
1465                  * assoc bit quickly enough before it sends the first frame
1466                  */
1467                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1468                     ieee80211_is_data_present(hdr->frame_control)) {
1469                         unsigned int hdrlen;
1470                         __be16 ethertype;
1471
1472                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1473
1474                         if (rx->skb->len < hdrlen + 8)
1475                                 return RX_DROP_MONITOR;
1476
1477                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1478                         if (ethertype == rx->sdata->control_port_protocol)
1479                                 return RX_CONTINUE;
1480                 }
1481
1482                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1483                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1484                                                hdr->addr2,
1485                                                GFP_ATOMIC))
1486                         return RX_DROP_UNUSABLE;
1487
1488                 return RX_DROP_MONITOR;
1489         }
1490
1491         return RX_CONTINUE;
1492 }
1493
1494
1495 static ieee80211_rx_result debug_noinline
1496 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1497 {
1498         struct ieee80211_local *local;
1499         struct ieee80211_hdr *hdr;
1500         struct sk_buff *skb;
1501
1502         local = rx->local;
1503         skb = rx->skb;
1504         hdr = (struct ieee80211_hdr *) skb->data;
1505
1506         if (!local->pspolling)
1507                 return RX_CONTINUE;
1508
1509         if (!ieee80211_has_fromds(hdr->frame_control))
1510                 /* this is not from AP */
1511                 return RX_CONTINUE;
1512
1513         if (!ieee80211_is_data(hdr->frame_control))
1514                 return RX_CONTINUE;
1515
1516         if (!ieee80211_has_moredata(hdr->frame_control)) {
1517                 /* AP has no more frames buffered for us */
1518                 local->pspolling = false;
1519                 return RX_CONTINUE;
1520         }
1521
1522         /* more data bit is set, let's request a new frame from the AP */
1523         ieee80211_send_pspoll(local, rx->sdata);
1524
1525         return RX_CONTINUE;
1526 }
1527
1528 static void sta_ps_start(struct sta_info *sta)
1529 {
1530         struct ieee80211_sub_if_data *sdata = sta->sdata;
1531         struct ieee80211_local *local = sdata->local;
1532         struct ps_data *ps;
1533         int tid;
1534
1535         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1536             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1537                 ps = &sdata->bss->ps;
1538         else
1539                 return;
1540
1541         atomic_inc(&ps->num_sta_ps);
1542         set_sta_flag(sta, WLAN_STA_PS_STA);
1543         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1544                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1545         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1546                sta->sta.addr, sta->sta.aid);
1547
1548         ieee80211_clear_fast_xmit(sta);
1549
1550         if (!sta->sta.txq[0])
1551                 return;
1552
1553         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1554                 if (txq_has_queue(sta->sta.txq[tid]))
1555                         set_bit(tid, &sta->txq_buffered_tids);
1556                 else
1557                         clear_bit(tid, &sta->txq_buffered_tids);
1558         }
1559 }
1560
1561 static void sta_ps_end(struct sta_info *sta)
1562 {
1563         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1564                sta->sta.addr, sta->sta.aid);
1565
1566         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1567                 /*
1568                  * Clear the flag only if the other one is still set
1569                  * so that the TX path won't start TX'ing new frames
1570                  * directly ... In the case that the driver flag isn't
1571                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1572                  */
1573                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1574                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1575                        sta->sta.addr, sta->sta.aid);
1576                 return;
1577         }
1578
1579         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1580         clear_sta_flag(sta, WLAN_STA_PS_STA);
1581         ieee80211_sta_ps_deliver_wakeup(sta);
1582 }
1583
1584 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1585 {
1586         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1587         bool in_ps;
1588
1589         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1590
1591         /* Don't let the same PS state be set twice */
1592         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1593         if ((start && in_ps) || (!start && !in_ps))
1594                 return -EINVAL;
1595
1596         if (start)
1597                 sta_ps_start(sta);
1598         else
1599                 sta_ps_end(sta);
1600
1601         return 0;
1602 }
1603 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1604
1605 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1606 {
1607         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1608
1609         if (test_sta_flag(sta, WLAN_STA_SP))
1610                 return;
1611
1612         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1613                 ieee80211_sta_ps_deliver_poll_response(sta);
1614         else
1615                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1616 }
1617 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1618
1619 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1620 {
1621         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1622         int ac = ieee80211_ac_from_tid(tid);
1623
1624         /*
1625          * If this AC is not trigger-enabled do nothing unless the
1626          * driver is calling us after it already checked.
1627          *
1628          * NB: This could/should check a separate bitmap of trigger-
1629          * enabled queues, but for now we only implement uAPSD w/o
1630          * TSPEC changes to the ACs, so they're always the same.
1631          */
1632         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1633             tid != IEEE80211_NUM_TIDS)
1634                 return;
1635
1636         /* if we are in a service period, do nothing */
1637         if (test_sta_flag(sta, WLAN_STA_SP))
1638                 return;
1639
1640         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1641                 ieee80211_sta_ps_deliver_uapsd(sta);
1642         else
1643                 set_sta_flag(sta, WLAN_STA_UAPSD);
1644 }
1645 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1646
1647 static ieee80211_rx_result debug_noinline
1648 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1649 {
1650         struct ieee80211_sub_if_data *sdata = rx->sdata;
1651         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1652         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1653
1654         if (!rx->sta)
1655                 return RX_CONTINUE;
1656
1657         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1658             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1659                 return RX_CONTINUE;
1660
1661         /*
1662          * The device handles station powersave, so don't do anything about
1663          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1664          * it to mac80211 since they're handled.)
1665          */
1666         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1667                 return RX_CONTINUE;
1668
1669         /*
1670          * Don't do anything if the station isn't already asleep. In
1671          * the uAPSD case, the station will probably be marked asleep,
1672          * in the PS-Poll case the station must be confused ...
1673          */
1674         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1675                 return RX_CONTINUE;
1676
1677         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1678                 ieee80211_sta_pspoll(&rx->sta->sta);
1679
1680                 /* Free PS Poll skb here instead of returning RX_DROP that would
1681                  * count as an dropped frame. */
1682                 dev_kfree_skb(rx->skb);
1683
1684                 return RX_QUEUED;
1685         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1686                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1687                    ieee80211_has_pm(hdr->frame_control) &&
1688                    (ieee80211_is_data_qos(hdr->frame_control) ||
1689                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1690                 u8 tid = ieee80211_get_tid(hdr);
1691
1692                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1693         }
1694
1695         return RX_CONTINUE;
1696 }
1697
1698 static ieee80211_rx_result debug_noinline
1699 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1700 {
1701         struct sta_info *sta = rx->sta;
1702         struct sk_buff *skb = rx->skb;
1703         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1704         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1705         int i;
1706
1707         if (!sta)
1708                 return RX_CONTINUE;
1709
1710         /*
1711          * Update last_rx only for IBSS packets which are for the current
1712          * BSSID and for station already AUTHORIZED to avoid keeping the
1713          * current IBSS network alive in cases where other STAs start
1714          * using different BSSID. This will also give the station another
1715          * chance to restart the authentication/authorization in case
1716          * something went wrong the first time.
1717          */
1718         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1719                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1720                                                 NL80211_IFTYPE_ADHOC);
1721                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1722                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1723                         sta->rx_stats.last_rx = jiffies;
1724                         if (ieee80211_is_data(hdr->frame_control) &&
1725                             !is_multicast_ether_addr(hdr->addr1))
1726                                 sta->rx_stats.last_rate =
1727                                         sta_stats_encode_rate(status);
1728                 }
1729         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1730                 sta->rx_stats.last_rx = jiffies;
1731         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1732                 /*
1733                  * Mesh beacons will update last_rx when if they are found to
1734                  * match the current local configuration when processed.
1735                  */
1736                 sta->rx_stats.last_rx = jiffies;
1737                 if (ieee80211_is_data(hdr->frame_control))
1738                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1739         }
1740
1741         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1742                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1743
1744         sta->rx_stats.fragments++;
1745
1746         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1747         sta->rx_stats.bytes += rx->skb->len;
1748         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1749
1750         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1751                 sta->rx_stats.last_signal = status->signal;
1752                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1753         }
1754
1755         if (status->chains) {
1756                 sta->rx_stats.chains = status->chains;
1757                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1758                         int signal = status->chain_signal[i];
1759
1760                         if (!(status->chains & BIT(i)))
1761                                 continue;
1762
1763                         sta->rx_stats.chain_signal_last[i] = signal;
1764                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1765                                         -signal);
1766                 }
1767         }
1768
1769         /*
1770          * Change STA power saving mode only at the end of a frame
1771          * exchange sequence, and only for a data or management
1772          * frame as specified in IEEE 802.11-2016 11.2.3.2
1773          */
1774         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1775             !ieee80211_has_morefrags(hdr->frame_control) &&
1776             !is_multicast_ether_addr(hdr->addr1) &&
1777             (ieee80211_is_mgmt(hdr->frame_control) ||
1778              ieee80211_is_data(hdr->frame_control)) &&
1779             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1780             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1781              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1782                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1783                         if (!ieee80211_has_pm(hdr->frame_control))
1784                                 sta_ps_end(sta);
1785                 } else {
1786                         if (ieee80211_has_pm(hdr->frame_control))
1787                                 sta_ps_start(sta);
1788                 }
1789         }
1790
1791         /* mesh power save support */
1792         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1793                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1794
1795         /*
1796          * Drop (qos-)data::nullfunc frames silently, since they
1797          * are used only to control station power saving mode.
1798          */
1799         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1800             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1801                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1802
1803                 /*
1804                  * If we receive a 4-addr nullfunc frame from a STA
1805                  * that was not moved to a 4-addr STA vlan yet send
1806                  * the event to userspace and for older hostapd drop
1807                  * the frame to the monitor interface.
1808                  */
1809                 if (ieee80211_has_a4(hdr->frame_control) &&
1810                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1811                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1812                       !rx->sdata->u.vlan.sta))) {
1813                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1814                                 cfg80211_rx_unexpected_4addr_frame(
1815                                         rx->sdata->dev, sta->sta.addr,
1816                                         GFP_ATOMIC);
1817                         return RX_DROP_MONITOR;
1818                 }
1819                 /*
1820                  * Update counter and free packet here to avoid
1821                  * counting this as a dropped packed.
1822                  */
1823                 sta->rx_stats.packets++;
1824                 dev_kfree_skb(rx->skb);
1825                 return RX_QUEUED;
1826         }
1827
1828         return RX_CONTINUE;
1829 } /* ieee80211_rx_h_sta_process */
1830
1831 static ieee80211_rx_result debug_noinline
1832 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1833 {
1834         struct sk_buff *skb = rx->skb;
1835         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1836         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1837         int keyidx;
1838         int hdrlen;
1839         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1840         struct ieee80211_key *sta_ptk = NULL;
1841         int mmie_keyidx = -1;
1842         __le16 fc;
1843         const struct ieee80211_cipher_scheme *cs = NULL;
1844
1845         /*
1846          * Key selection 101
1847          *
1848          * There are four types of keys:
1849          *  - GTK (group keys)
1850          *  - IGTK (group keys for management frames)
1851          *  - PTK (pairwise keys)
1852          *  - STK (station-to-station pairwise keys)
1853          *
1854          * When selecting a key, we have to distinguish between multicast
1855          * (including broadcast) and unicast frames, the latter can only
1856          * use PTKs and STKs while the former always use GTKs and IGTKs.
1857          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1858          * unicast frames can also use key indices like GTKs. Hence, if we
1859          * don't have a PTK/STK we check the key index for a WEP key.
1860          *
1861          * Note that in a regular BSS, multicast frames are sent by the
1862          * AP only, associated stations unicast the frame to the AP first
1863          * which then multicasts it on their behalf.
1864          *
1865          * There is also a slight problem in IBSS mode: GTKs are negotiated
1866          * with each station, that is something we don't currently handle.
1867          * The spec seems to expect that one negotiates the same key with
1868          * every station but there's no such requirement; VLANs could be
1869          * possible.
1870          */
1871
1872         /* start without a key */
1873         rx->key = NULL;
1874         fc = hdr->frame_control;
1875
1876         if (rx->sta) {
1877                 int keyid = rx->sta->ptk_idx;
1878
1879                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1880                         cs = rx->sta->cipher_scheme;
1881                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1882                         if (unlikely(keyid < 0))
1883                                 return RX_DROP_UNUSABLE;
1884                 }
1885                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1886         }
1887
1888         if (!ieee80211_has_protected(fc))
1889                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1890
1891         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1892                 rx->key = sta_ptk;
1893                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1894                     (status->flag & RX_FLAG_IV_STRIPPED))
1895                         return RX_CONTINUE;
1896                 /* Skip decryption if the frame is not protected. */
1897                 if (!ieee80211_has_protected(fc))
1898                         return RX_CONTINUE;
1899         } else if (mmie_keyidx >= 0) {
1900                 /* Broadcast/multicast robust management frame / BIP */
1901                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1902                     (status->flag & RX_FLAG_IV_STRIPPED))
1903                         return RX_CONTINUE;
1904
1905                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1906                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1907                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1908                 if (rx->sta) {
1909                         if (ieee80211_is_group_privacy_action(skb) &&
1910                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1911                                 return RX_DROP_MONITOR;
1912
1913                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1914                 }
1915                 if (!rx->key)
1916                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1917         } else if (!ieee80211_has_protected(fc)) {
1918                 /*
1919                  * The frame was not protected, so skip decryption. However, we
1920                  * need to set rx->key if there is a key that could have been
1921                  * used so that the frame may be dropped if encryption would
1922                  * have been expected.
1923                  */
1924                 struct ieee80211_key *key = NULL;
1925                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1926                 int i;
1927
1928                 if (ieee80211_is_mgmt(fc) &&
1929                     is_multicast_ether_addr(hdr->addr1) &&
1930                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1931                         rx->key = key;
1932                 else {
1933                         if (rx->sta) {
1934                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1935                                         key = rcu_dereference(rx->sta->gtk[i]);
1936                                         if (key)
1937                                                 break;
1938                                 }
1939                         }
1940                         if (!key) {
1941                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1942                                         key = rcu_dereference(sdata->keys[i]);
1943                                         if (key)
1944                                                 break;
1945                                 }
1946                         }
1947                         if (key)
1948                                 rx->key = key;
1949                 }
1950                 return RX_CONTINUE;
1951         } else {
1952                 u8 keyid;
1953
1954                 /*
1955                  * The device doesn't give us the IV so we won't be
1956                  * able to look up the key. That's ok though, we
1957                  * don't need to decrypt the frame, we just won't
1958                  * be able to keep statistics accurate.
1959                  * Except for key threshold notifications, should
1960                  * we somehow allow the driver to tell us which key
1961                  * the hardware used if this flag is set?
1962                  */
1963                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1964                     (status->flag & RX_FLAG_IV_STRIPPED))
1965                         return RX_CONTINUE;
1966
1967                 hdrlen = ieee80211_hdrlen(fc);
1968
1969                 if (cs) {
1970                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1971
1972                         if (unlikely(keyidx < 0))
1973                                 return RX_DROP_UNUSABLE;
1974                 } else {
1975                         if (rx->skb->len < 8 + hdrlen)
1976                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1977                         /*
1978                          * no need to call ieee80211_wep_get_keyidx,
1979                          * it verifies a bunch of things we've done already
1980                          */
1981                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1982                         keyidx = keyid >> 6;
1983                 }
1984
1985                 /* check per-station GTK first, if multicast packet */
1986                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1987                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1988
1989                 /* if not found, try default key */
1990                 if (!rx->key) {
1991                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1992
1993                         /*
1994                          * RSNA-protected unicast frames should always be
1995                          * sent with pairwise or station-to-station keys,
1996                          * but for WEP we allow using a key index as well.
1997                          */
1998                         if (rx->key &&
1999                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2000                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2001                             !is_multicast_ether_addr(hdr->addr1))
2002                                 rx->key = NULL;
2003                 }
2004         }
2005
2006         if (rx->key) {
2007                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2008                         return RX_DROP_MONITOR;
2009
2010                 /* TODO: add threshold stuff again */
2011         } else {
2012                 return RX_DROP_MONITOR;
2013         }
2014
2015         switch (rx->key->conf.cipher) {
2016         case WLAN_CIPHER_SUITE_WEP40:
2017         case WLAN_CIPHER_SUITE_WEP104:
2018                 result = ieee80211_crypto_wep_decrypt(rx);
2019                 break;
2020         case WLAN_CIPHER_SUITE_TKIP:
2021                 result = ieee80211_crypto_tkip_decrypt(rx);
2022                 break;
2023         case WLAN_CIPHER_SUITE_CCMP:
2024                 result = ieee80211_crypto_ccmp_decrypt(
2025                         rx, IEEE80211_CCMP_MIC_LEN);
2026                 break;
2027         case WLAN_CIPHER_SUITE_CCMP_256:
2028                 result = ieee80211_crypto_ccmp_decrypt(
2029                         rx, IEEE80211_CCMP_256_MIC_LEN);
2030                 break;
2031         case WLAN_CIPHER_SUITE_AES_CMAC:
2032                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2033                 break;
2034         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2035                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2036                 break;
2037         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2038         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2039                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2040                 break;
2041         case WLAN_CIPHER_SUITE_GCMP:
2042         case WLAN_CIPHER_SUITE_GCMP_256:
2043                 result = ieee80211_crypto_gcmp_decrypt(rx);
2044                 break;
2045         default:
2046                 result = ieee80211_crypto_hw_decrypt(rx);
2047         }
2048
2049         /* the hdr variable is invalid after the decrypt handlers */
2050
2051         /* either the frame has been decrypted or will be dropped */
2052         status->flag |= RX_FLAG_DECRYPTED;
2053
2054         return result;
2055 }
2056
2057 static inline struct ieee80211_fragment_entry *
2058 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2059                          unsigned int frag, unsigned int seq, int rx_queue,
2060                          struct sk_buff **skb)
2061 {
2062         struct ieee80211_fragment_entry *entry;
2063
2064         entry = &sdata->fragments[sdata->fragment_next++];
2065         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2066                 sdata->fragment_next = 0;
2067
2068         if (!skb_queue_empty(&entry->skb_list))
2069                 __skb_queue_purge(&entry->skb_list);
2070
2071         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2072         *skb = NULL;
2073         entry->first_frag_time = jiffies;
2074         entry->seq = seq;
2075         entry->rx_queue = rx_queue;
2076         entry->last_frag = frag;
2077         entry->check_sequential_pn = false;
2078         entry->extra_len = 0;
2079
2080         return entry;
2081 }
2082
2083 static inline struct ieee80211_fragment_entry *
2084 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2085                           unsigned int frag, unsigned int seq,
2086                           int rx_queue, struct ieee80211_hdr *hdr)
2087 {
2088         struct ieee80211_fragment_entry *entry;
2089         int i, idx;
2090
2091         idx = sdata->fragment_next;
2092         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2093                 struct ieee80211_hdr *f_hdr;
2094                 struct sk_buff *f_skb;
2095
2096                 idx--;
2097                 if (idx < 0)
2098                         idx = IEEE80211_FRAGMENT_MAX - 1;
2099
2100                 entry = &sdata->fragments[idx];
2101                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2102                     entry->rx_queue != rx_queue ||
2103                     entry->last_frag + 1 != frag)
2104                         continue;
2105
2106                 f_skb = __skb_peek(&entry->skb_list);
2107                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2108
2109                 /*
2110                  * Check ftype and addresses are equal, else check next fragment
2111                  */
2112                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2113                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2114                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2115                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2116                         continue;
2117
2118                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2119                         __skb_queue_purge(&entry->skb_list);
2120                         continue;
2121                 }
2122                 return entry;
2123         }
2124
2125         return NULL;
2126 }
2127
2128 static ieee80211_rx_result debug_noinline
2129 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2130 {
2131         struct ieee80211_hdr *hdr;
2132         u16 sc;
2133         __le16 fc;
2134         unsigned int frag, seq;
2135         struct ieee80211_fragment_entry *entry;
2136         struct sk_buff *skb;
2137
2138         hdr = (struct ieee80211_hdr *)rx->skb->data;
2139         fc = hdr->frame_control;
2140
2141         if (ieee80211_is_ctl(fc))
2142                 return RX_CONTINUE;
2143
2144         sc = le16_to_cpu(hdr->seq_ctrl);
2145         frag = sc & IEEE80211_SCTL_FRAG;
2146
2147         if (is_multicast_ether_addr(hdr->addr1)) {
2148                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2149                 goto out_no_led;
2150         }
2151
2152         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2153                 goto out;
2154
2155         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2156
2157         if (skb_linearize(rx->skb))
2158                 return RX_DROP_UNUSABLE;
2159
2160         /*
2161          *  skb_linearize() might change the skb->data and
2162          *  previously cached variables (in this case, hdr) need to
2163          *  be refreshed with the new data.
2164          */
2165         hdr = (struct ieee80211_hdr *)rx->skb->data;
2166         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2167
2168         if (frag == 0) {
2169                 /* This is the first fragment of a new frame. */
2170                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2171                                                  rx->seqno_idx, &(rx->skb));
2172                 if (rx->key &&
2173                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2174                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2175                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2176                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2177                     ieee80211_has_protected(fc)) {
2178                         int queue = rx->security_idx;
2179
2180                         /* Store CCMP/GCMP PN so that we can verify that the
2181                          * next fragment has a sequential PN value.
2182                          */
2183                         entry->check_sequential_pn = true;
2184                         memcpy(entry->last_pn,
2185                                rx->key->u.ccmp.rx_pn[queue],
2186                                IEEE80211_CCMP_PN_LEN);
2187                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2188                                               u.ccmp.rx_pn) !=
2189                                      offsetof(struct ieee80211_key,
2190                                               u.gcmp.rx_pn));
2191                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2192                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2193                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2194                                      IEEE80211_GCMP_PN_LEN);
2195                 }
2196                 return RX_QUEUED;
2197         }
2198
2199         /* This is a fragment for a frame that should already be pending in
2200          * fragment cache. Add this fragment to the end of the pending entry.
2201          */
2202         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2203                                           rx->seqno_idx, hdr);
2204         if (!entry) {
2205                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2206                 return RX_DROP_MONITOR;
2207         }
2208
2209         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2210          *  MPDU PN values are not incrementing in steps of 1."
2211          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2212          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2213          */
2214         if (entry->check_sequential_pn) {
2215                 int i;
2216                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2217                 int queue;
2218
2219                 if (!rx->key ||
2220                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2221                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2222                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2223                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2224                         return RX_DROP_UNUSABLE;
2225                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2226                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2227                         pn[i]++;
2228                         if (pn[i])
2229                                 break;
2230                 }
2231                 queue = rx->security_idx;
2232                 rpn = rx->key->u.ccmp.rx_pn[queue];
2233                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2234                         return RX_DROP_UNUSABLE;
2235                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2236         }
2237
2238         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2239         __skb_queue_tail(&entry->skb_list, rx->skb);
2240         entry->last_frag = frag;
2241         entry->extra_len += rx->skb->len;
2242         if (ieee80211_has_morefrags(fc)) {
2243                 rx->skb = NULL;
2244                 return RX_QUEUED;
2245         }
2246
2247         rx->skb = __skb_dequeue(&entry->skb_list);
2248         if (skb_tailroom(rx->skb) < entry->extra_len) {
2249                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2250                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2251                                               GFP_ATOMIC))) {
2252                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2253                         __skb_queue_purge(&entry->skb_list);
2254                         return RX_DROP_UNUSABLE;
2255                 }
2256         }
2257         while ((skb = __skb_dequeue(&entry->skb_list))) {
2258                 skb_put_data(rx->skb, skb->data, skb->len);
2259                 dev_kfree_skb(skb);
2260         }
2261
2262  out:
2263         ieee80211_led_rx(rx->local);
2264  out_no_led:
2265         if (rx->sta)
2266                 rx->sta->rx_stats.packets++;
2267         return RX_CONTINUE;
2268 }
2269
2270 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2271 {
2272         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2273                 return -EACCES;
2274
2275         return 0;
2276 }
2277
2278 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2279 {
2280         struct sk_buff *skb = rx->skb;
2281         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2282
2283         /*
2284          * Pass through unencrypted frames if the hardware has
2285          * decrypted them already.
2286          */
2287         if (status->flag & RX_FLAG_DECRYPTED)
2288                 return 0;
2289
2290         /* Drop unencrypted frames if key is set. */
2291         if (unlikely(!ieee80211_has_protected(fc) &&
2292                      !ieee80211_is_nullfunc(fc) &&
2293                      ieee80211_is_data(fc) && rx->key))
2294                 return -EACCES;
2295
2296         return 0;
2297 }
2298
2299 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2300 {
2301         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2302         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2303         __le16 fc = hdr->frame_control;
2304
2305         /*
2306          * Pass through unencrypted frames if the hardware has
2307          * decrypted them already.
2308          */
2309         if (status->flag & RX_FLAG_DECRYPTED)
2310                 return 0;
2311
2312         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2313                 if (unlikely(!ieee80211_has_protected(fc) &&
2314                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2315                              rx->key)) {
2316                         if (ieee80211_is_deauth(fc) ||
2317                             ieee80211_is_disassoc(fc))
2318                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2319                                                              rx->skb->data,
2320                                                              rx->skb->len);
2321                         return -EACCES;
2322                 }
2323                 /* BIP does not use Protected field, so need to check MMIE */
2324                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2325                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2326                         if (ieee80211_is_deauth(fc) ||
2327                             ieee80211_is_disassoc(fc))
2328                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2329                                                              rx->skb->data,
2330                                                              rx->skb->len);
2331                         return -EACCES;
2332                 }
2333                 /*
2334                  * When using MFP, Action frames are not allowed prior to
2335                  * having configured keys.
2336                  */
2337                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2338                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2339                         return -EACCES;
2340         }
2341
2342         return 0;
2343 }
2344
2345 static int
2346 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2347 {
2348         struct ieee80211_sub_if_data *sdata = rx->sdata;
2349         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2350         bool check_port_control = false;
2351         struct ethhdr *ehdr;
2352         int ret;
2353
2354         *port_control = false;
2355         if (ieee80211_has_a4(hdr->frame_control) &&
2356             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2357                 return -1;
2358
2359         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2360             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2361
2362                 if (!sdata->u.mgd.use_4addr)
2363                         return -1;
2364                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2365                         check_port_control = true;
2366         }
2367
2368         if (is_multicast_ether_addr(hdr->addr1) &&
2369             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2370                 return -1;
2371
2372         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2373         if (ret < 0)
2374                 return ret;
2375
2376         ehdr = (struct ethhdr *) rx->skb->data;
2377         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2378                 *port_control = true;
2379         else if (check_port_control)
2380                 return -1;
2381
2382         return 0;
2383 }
2384
2385 /*
2386  * requires that rx->skb is a frame with ethernet header
2387  */
2388 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2389 {
2390         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2391                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2392         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2393
2394         /*
2395          * Allow EAPOL frames to us/the PAE group address regardless
2396          * of whether the frame was encrypted or not.
2397          */
2398         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2399             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2400              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2401                 return true;
2402
2403         if (ieee80211_802_1x_port_control(rx) ||
2404             ieee80211_drop_unencrypted(rx, fc))
2405                 return false;
2406
2407         return true;
2408 }
2409
2410 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2411                                                  struct ieee80211_rx_data *rx)
2412 {
2413         struct ieee80211_sub_if_data *sdata = rx->sdata;
2414         struct net_device *dev = sdata->dev;
2415
2416         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2417                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2418                      sdata->control_port_over_nl80211)) {
2419                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2420                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2421
2422                 cfg80211_rx_control_port(dev, skb, noencrypt);
2423                 dev_kfree_skb(skb);
2424         } else {
2425                 /* deliver to local stack */
2426                 if (rx->napi)
2427                         napi_gro_receive(rx->napi, skb);
2428                 else
2429                         netif_receive_skb(skb);
2430         }
2431 }
2432
2433 /*
2434  * requires that rx->skb is a frame with ethernet header
2435  */
2436 static void
2437 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2438 {
2439         struct ieee80211_sub_if_data *sdata = rx->sdata;
2440         struct net_device *dev = sdata->dev;
2441         struct sk_buff *skb, *xmit_skb;
2442         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2443         struct sta_info *dsta;
2444
2445         skb = rx->skb;
2446         xmit_skb = NULL;
2447
2448         ieee80211_rx_stats(dev, skb->len);
2449
2450         if (rx->sta) {
2451                 /* The seqno index has the same property as needed
2452                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2453                  * for non-QoS-data frames. Here we know it's a data
2454                  * frame, so count MSDUs.
2455                  */
2456                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2457                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2458                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2459         }
2460
2461         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2462              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2463             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2464             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2465                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2466                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2467                         /*
2468                          * send multicast frames both to higher layers in
2469                          * local net stack and back to the wireless medium
2470                          */
2471                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2472                         if (!xmit_skb)
2473                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2474                                                     dev->name);
2475                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2476                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2477                         dsta = sta_info_get(sdata, ehdr->h_dest);
2478                         if (dsta) {
2479                                 /*
2480                                  * The destination station is associated to
2481                                  * this AP (in this VLAN), so send the frame
2482                                  * directly to it and do not pass it to local
2483                                  * net stack.
2484                                  */
2485                                 xmit_skb = skb;
2486                                 skb = NULL;
2487                         }
2488                 }
2489         }
2490
2491 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2492         if (skb) {
2493                 /* 'align' will only take the values 0 or 2 here since all
2494                  * frames are required to be aligned to 2-byte boundaries
2495                  * when being passed to mac80211; the code here works just
2496                  * as well if that isn't true, but mac80211 assumes it can
2497                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2498                  */
2499                 int align;
2500
2501                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2502                 if (align) {
2503                         if (WARN_ON(skb_headroom(skb) < 3)) {
2504                                 dev_kfree_skb(skb);
2505                                 skb = NULL;
2506                         } else {
2507                                 u8 *data = skb->data;
2508                                 size_t len = skb_headlen(skb);
2509                                 skb->data -= align;
2510                                 memmove(skb->data, data, len);
2511                                 skb_set_tail_pointer(skb, len);
2512                         }
2513                 }
2514         }
2515 #endif
2516
2517         if (skb) {
2518                 skb->protocol = eth_type_trans(skb, dev);
2519                 memset(skb->cb, 0, sizeof(skb->cb));
2520
2521                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2522         }
2523
2524         if (xmit_skb) {
2525                 /*
2526                  * Send to wireless media and increase priority by 256 to
2527                  * keep the received priority instead of reclassifying
2528                  * the frame (see cfg80211_classify8021d).
2529                  */
2530                 xmit_skb->priority += 256;
2531                 xmit_skb->protocol = htons(ETH_P_802_3);
2532                 skb_reset_network_header(xmit_skb);
2533                 skb_reset_mac_header(xmit_skb);
2534                 dev_queue_xmit(xmit_skb);
2535         }
2536 }
2537
2538 static ieee80211_rx_result debug_noinline
2539 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2540 {
2541         struct net_device *dev = rx->sdata->dev;
2542         struct sk_buff *skb = rx->skb;
2543         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2544         __le16 fc = hdr->frame_control;
2545         struct sk_buff_head frame_list;
2546         struct ethhdr ethhdr;
2547         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2548
2549         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2550                 check_da = NULL;
2551                 check_sa = NULL;
2552         } else switch (rx->sdata->vif.type) {
2553                 case NL80211_IFTYPE_AP:
2554                 case NL80211_IFTYPE_AP_VLAN:
2555                         check_da = NULL;
2556                         break;
2557                 case NL80211_IFTYPE_STATION:
2558                         if (!rx->sta ||
2559                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2560                                 check_sa = NULL;
2561                         break;
2562                 case NL80211_IFTYPE_MESH_POINT:
2563                         check_sa = NULL;
2564                         break;
2565                 default:
2566                         break;
2567         }
2568
2569         skb->dev = dev;
2570         __skb_queue_head_init(&frame_list);
2571
2572         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2573                                           rx->sdata->vif.addr,
2574                                           rx->sdata->vif.type,
2575                                           data_offset))
2576                 return RX_DROP_UNUSABLE;
2577
2578         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2579                                  rx->sdata->vif.type,
2580                                  rx->local->hw.extra_tx_headroom,
2581                                  check_da, check_sa);
2582
2583         while (!skb_queue_empty(&frame_list)) {
2584                 rx->skb = __skb_dequeue(&frame_list);
2585
2586                 if (!ieee80211_frame_allowed(rx, fc)) {
2587                         dev_kfree_skb(rx->skb);
2588                         continue;
2589                 }
2590
2591                 ieee80211_deliver_skb(rx);
2592         }
2593
2594         return RX_QUEUED;
2595 }
2596
2597 static ieee80211_rx_result debug_noinline
2598 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2599 {
2600         struct sk_buff *skb = rx->skb;
2601         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2602         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2603         __le16 fc = hdr->frame_control;
2604
2605         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2606                 return RX_CONTINUE;
2607
2608         if (unlikely(!ieee80211_is_data(fc)))
2609                 return RX_CONTINUE;
2610
2611         if (unlikely(!ieee80211_is_data_present(fc)))
2612                 return RX_DROP_MONITOR;
2613
2614         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2615                 switch (rx->sdata->vif.type) {
2616                 case NL80211_IFTYPE_AP_VLAN:
2617                         if (!rx->sdata->u.vlan.sta)
2618                                 return RX_DROP_UNUSABLE;
2619                         break;
2620                 case NL80211_IFTYPE_STATION:
2621                         if (!rx->sdata->u.mgd.use_4addr)
2622                                 return RX_DROP_UNUSABLE;
2623                         break;
2624                 default:
2625                         return RX_DROP_UNUSABLE;
2626                 }
2627         }
2628
2629         if (is_multicast_ether_addr(hdr->addr1))
2630                 return RX_DROP_UNUSABLE;
2631
2632         return __ieee80211_rx_h_amsdu(rx, 0);
2633 }
2634
2635 #ifdef CONFIG_MAC80211_MESH
2636 static ieee80211_rx_result
2637 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2638 {
2639         struct ieee80211_hdr *fwd_hdr, *hdr;
2640         struct ieee80211_tx_info *info;
2641         struct ieee80211s_hdr *mesh_hdr;
2642         struct sk_buff *skb = rx->skb, *fwd_skb;
2643         struct ieee80211_local *local = rx->local;
2644         struct ieee80211_sub_if_data *sdata = rx->sdata;
2645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2646         u16 ac, q, hdrlen;
2647
2648         hdr = (struct ieee80211_hdr *) skb->data;
2649         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2650
2651         /* make sure fixed part of mesh header is there, also checks skb len */
2652         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2653                 return RX_DROP_MONITOR;
2654
2655         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2656
2657         /* make sure full mesh header is there, also checks skb len */
2658         if (!pskb_may_pull(rx->skb,
2659                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2660                 return RX_DROP_MONITOR;
2661
2662         /* reload pointers */
2663         hdr = (struct ieee80211_hdr *) skb->data;
2664         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2665
2666         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2667                 return RX_DROP_MONITOR;
2668
2669         /* frame is in RMC, don't forward */
2670         if (ieee80211_is_data(hdr->frame_control) &&
2671             is_multicast_ether_addr(hdr->addr1) &&
2672             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2673                 return RX_DROP_MONITOR;
2674
2675         if (!ieee80211_is_data(hdr->frame_control))
2676                 return RX_CONTINUE;
2677
2678         if (!mesh_hdr->ttl)
2679                 return RX_DROP_MONITOR;
2680
2681         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2682                 struct mesh_path *mppath;
2683                 char *proxied_addr;
2684                 char *mpp_addr;
2685
2686                 if (is_multicast_ether_addr(hdr->addr1)) {
2687                         mpp_addr = hdr->addr3;
2688                         proxied_addr = mesh_hdr->eaddr1;
2689                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2690                             MESH_FLAGS_AE_A5_A6) {
2691                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2692                         mpp_addr = hdr->addr4;
2693                         proxied_addr = mesh_hdr->eaddr2;
2694                 } else {
2695                         return RX_DROP_MONITOR;
2696                 }
2697
2698                 rcu_read_lock();
2699                 mppath = mpp_path_lookup(sdata, proxied_addr);
2700                 if (!mppath) {
2701                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2702                 } else {
2703                         spin_lock_bh(&mppath->state_lock);
2704                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2705                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2706                         mppath->exp_time = jiffies;
2707                         spin_unlock_bh(&mppath->state_lock);
2708                 }
2709                 rcu_read_unlock();
2710         }
2711
2712         /* Frame has reached destination.  Don't forward */
2713         if (!is_multicast_ether_addr(hdr->addr1) &&
2714             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2715                 return RX_CONTINUE;
2716
2717         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2718         q = sdata->vif.hw_queue[ac];
2719         if (ieee80211_queue_stopped(&local->hw, q)) {
2720                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2721                 return RX_DROP_MONITOR;
2722         }
2723         skb_set_queue_mapping(skb, q);
2724
2725         if (!--mesh_hdr->ttl) {
2726                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2727                 goto out;
2728         }
2729
2730         if (!ifmsh->mshcfg.dot11MeshForwarding)
2731                 goto out;
2732
2733         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2734                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2735         if (!fwd_skb)
2736                 goto out;
2737
2738         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2739         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2740         info = IEEE80211_SKB_CB(fwd_skb);
2741         memset(info, 0, sizeof(*info));
2742         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2743         info->control.vif = &rx->sdata->vif;
2744         info->control.jiffies = jiffies;
2745         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2746                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2747                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2748                 /* update power mode indication when forwarding */
2749                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2750         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2751                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2752                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2753         } else {
2754                 /* unable to resolve next hop */
2755                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2756                                    fwd_hdr->addr3, 0,
2757                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2758                                    fwd_hdr->addr2);
2759                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2760                 kfree_skb(fwd_skb);
2761                 return RX_DROP_MONITOR;
2762         }
2763
2764         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2765         ieee80211_add_pending_skb(local, fwd_skb);
2766  out:
2767         if (is_multicast_ether_addr(hdr->addr1))
2768                 return RX_CONTINUE;
2769         return RX_DROP_MONITOR;
2770 }
2771 #endif
2772
2773 static ieee80211_rx_result debug_noinline
2774 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2775 {
2776         struct ieee80211_sub_if_data *sdata = rx->sdata;
2777         struct ieee80211_local *local = rx->local;
2778         struct net_device *dev = sdata->dev;
2779         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2780         __le16 fc = hdr->frame_control;
2781         bool port_control;
2782         int err;
2783
2784         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2785                 return RX_CONTINUE;
2786
2787         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2788                 return RX_DROP_MONITOR;
2789
2790         /*
2791          * Send unexpected-4addr-frame event to hostapd. For older versions,
2792          * also drop the frame to cooked monitor interfaces.
2793          */
2794         if (ieee80211_has_a4(hdr->frame_control) &&
2795             sdata->vif.type == NL80211_IFTYPE_AP) {
2796                 if (rx->sta &&
2797                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2798                         cfg80211_rx_unexpected_4addr_frame(
2799                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2800                 return RX_DROP_MONITOR;
2801         }
2802
2803         err = __ieee80211_data_to_8023(rx, &port_control);
2804         if (unlikely(err))
2805                 return RX_DROP_UNUSABLE;
2806
2807         if (!ieee80211_frame_allowed(rx, fc))
2808                 return RX_DROP_MONITOR;
2809
2810         /* directly handle TDLS channel switch requests/responses */
2811         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2812                                                 cpu_to_be16(ETH_P_TDLS))) {
2813                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2814
2815                 if (pskb_may_pull(rx->skb,
2816                                   offsetof(struct ieee80211_tdls_data, u)) &&
2817                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2818                     tf->category == WLAN_CATEGORY_TDLS &&
2819                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2820                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2821                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2822                         schedule_work(&local->tdls_chsw_work);
2823                         if (rx->sta)
2824                                 rx->sta->rx_stats.packets++;
2825
2826                         return RX_QUEUED;
2827                 }
2828         }
2829
2830         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2831             unlikely(port_control) && sdata->bss) {
2832                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2833                                      u.ap);
2834                 dev = sdata->dev;
2835                 rx->sdata = sdata;
2836         }
2837
2838         rx->skb->dev = dev;
2839
2840         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2841             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2842             !is_multicast_ether_addr(
2843                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2844             (!local->scanning &&
2845              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2846                 mod_timer(&local->dynamic_ps_timer, jiffies +
2847                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2848
2849         ieee80211_deliver_skb(rx);
2850
2851         return RX_QUEUED;
2852 }
2853
2854 static ieee80211_rx_result debug_noinline
2855 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2856 {
2857         struct sk_buff *skb = rx->skb;
2858         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2859         struct tid_ampdu_rx *tid_agg_rx;
2860         u16 start_seq_num;
2861         u16 tid;
2862
2863         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2864                 return RX_CONTINUE;
2865
2866         if (ieee80211_is_back_req(bar->frame_control)) {
2867                 struct {
2868                         __le16 control, start_seq_num;
2869                 } __packed bar_data;
2870                 struct ieee80211_event event = {
2871                         .type = BAR_RX_EVENT,
2872                 };
2873
2874                 if (!rx->sta)
2875                         return RX_DROP_MONITOR;
2876
2877                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2878                                   &bar_data, sizeof(bar_data)))
2879                         return RX_DROP_MONITOR;
2880
2881                 tid = le16_to_cpu(bar_data.control) >> 12;
2882
2883                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2884                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2885                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2886                                              WLAN_BACK_RECIPIENT,
2887                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2888
2889                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2890                 if (!tid_agg_rx)
2891                         return RX_DROP_MONITOR;
2892
2893                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2894                 event.u.ba.tid = tid;
2895                 event.u.ba.ssn = start_seq_num;
2896                 event.u.ba.sta = &rx->sta->sta;
2897
2898                 /* reset session timer */
2899                 if (tid_agg_rx->timeout)
2900                         mod_timer(&tid_agg_rx->session_timer,
2901                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2902
2903                 spin_lock(&tid_agg_rx->reorder_lock);
2904                 /* release stored frames up to start of BAR */
2905                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2906                                                  start_seq_num, frames);
2907                 spin_unlock(&tid_agg_rx->reorder_lock);
2908
2909                 drv_event_callback(rx->local, rx->sdata, &event);
2910
2911                 kfree_skb(skb);
2912                 return RX_QUEUED;
2913         }
2914
2915         /*
2916          * After this point, we only want management frames,
2917          * so we can drop all remaining control frames to
2918          * cooked monitor interfaces.
2919          */
2920         return RX_DROP_MONITOR;
2921 }
2922
2923 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2924                                            struct ieee80211_mgmt *mgmt,
2925                                            size_t len)
2926 {
2927         struct ieee80211_local *local = sdata->local;
2928         struct sk_buff *skb;
2929         struct ieee80211_mgmt *resp;
2930
2931         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2932                 /* Not to own unicast address */
2933                 return;
2934         }
2935
2936         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2937             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2938                 /* Not from the current AP or not associated yet. */
2939                 return;
2940         }
2941
2942         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2943                 /* Too short SA Query request frame */
2944                 return;
2945         }
2946
2947         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2948         if (skb == NULL)
2949                 return;
2950
2951         skb_reserve(skb, local->hw.extra_tx_headroom);
2952         resp = skb_put_zero(skb, 24);
2953         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2954         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2955         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2956         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2957                                           IEEE80211_STYPE_ACTION);
2958         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2959         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2960         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2961         memcpy(resp->u.action.u.sa_query.trans_id,
2962                mgmt->u.action.u.sa_query.trans_id,
2963                WLAN_SA_QUERY_TR_ID_LEN);
2964
2965         ieee80211_tx_skb(sdata, skb);
2966 }
2967
2968 static ieee80211_rx_result debug_noinline
2969 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2970 {
2971         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2972         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2973
2974         /*
2975          * From here on, look only at management frames.
2976          * Data and control frames are already handled,
2977          * and unknown (reserved) frames are useless.
2978          */
2979         if (rx->skb->len < 24)
2980                 return RX_DROP_MONITOR;
2981
2982         if (!ieee80211_is_mgmt(mgmt->frame_control))
2983                 return RX_DROP_MONITOR;
2984
2985         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2986             ieee80211_is_beacon(mgmt->frame_control) &&
2987             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2988                 int sig = 0;
2989
2990                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2991                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2992                         sig = status->signal;
2993
2994                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2995                                             rx->skb->data, rx->skb->len,
2996                                             status->freq, sig);
2997                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2998         }
2999
3000         if (ieee80211_drop_unencrypted_mgmt(rx))
3001                 return RX_DROP_UNUSABLE;
3002
3003         return RX_CONTINUE;
3004 }
3005
3006 static ieee80211_rx_result debug_noinline
3007 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3008 {
3009         struct ieee80211_local *local = rx->local;
3010         struct ieee80211_sub_if_data *sdata = rx->sdata;
3011         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3012         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3013         int len = rx->skb->len;
3014
3015         if (!ieee80211_is_action(mgmt->frame_control))
3016                 return RX_CONTINUE;
3017
3018         /* drop too small frames */
3019         if (len < IEEE80211_MIN_ACTION_SIZE)
3020                 return RX_DROP_UNUSABLE;
3021
3022         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3023             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3024             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3025                 return RX_DROP_UNUSABLE;
3026
3027         switch (mgmt->u.action.category) {
3028         case WLAN_CATEGORY_HT:
3029                 /* reject HT action frames from stations not supporting HT */
3030                 if (!rx->sta->sta.ht_cap.ht_supported)
3031                         goto invalid;
3032
3033                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3034                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3035                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3036                     sdata->vif.type != NL80211_IFTYPE_AP &&
3037                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3038                         break;
3039
3040                 /* verify action & smps_control/chanwidth are present */
3041                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3042                         goto invalid;
3043
3044                 switch (mgmt->u.action.u.ht_smps.action) {
3045                 case WLAN_HT_ACTION_SMPS: {
3046                         struct ieee80211_supported_band *sband;
3047                         enum ieee80211_smps_mode smps_mode;
3048                         struct sta_opmode_info sta_opmode = {};
3049
3050                         /* convert to HT capability */
3051                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3052                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3053                                 smps_mode = IEEE80211_SMPS_OFF;
3054                                 break;
3055                         case WLAN_HT_SMPS_CONTROL_STATIC:
3056                                 smps_mode = IEEE80211_SMPS_STATIC;
3057                                 break;
3058                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3059                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3060                                 break;
3061                         default:
3062                                 goto invalid;
3063                         }
3064
3065                         /* if no change do nothing */
3066                         if (rx->sta->sta.smps_mode == smps_mode)
3067                                 goto handled;
3068                         rx->sta->sta.smps_mode = smps_mode;
3069                         sta_opmode.smps_mode =
3070                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3071                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3072
3073                         sband = rx->local->hw.wiphy->bands[status->band];
3074
3075                         rate_control_rate_update(local, sband, rx->sta,
3076                                                  IEEE80211_RC_SMPS_CHANGED);
3077                         cfg80211_sta_opmode_change_notify(sdata->dev,
3078                                                           rx->sta->addr,
3079                                                           &sta_opmode,
3080                                                           GFP_ATOMIC);
3081                         goto handled;
3082                 }
3083                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3084                         struct ieee80211_supported_band *sband;
3085                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3086                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3087                         struct sta_opmode_info sta_opmode = {};
3088
3089                         /* If it doesn't support 40 MHz it can't change ... */
3090                         if (!(rx->sta->sta.ht_cap.cap &
3091                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3092                                 goto handled;
3093
3094                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3095                                 max_bw = IEEE80211_STA_RX_BW_20;
3096                         else
3097                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3098
3099                         /* set cur_max_bandwidth and recalc sta bw */
3100                         rx->sta->cur_max_bandwidth = max_bw;
3101                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3102
3103                         if (rx->sta->sta.bandwidth == new_bw)
3104                                 goto handled;
3105
3106                         rx->sta->sta.bandwidth = new_bw;
3107                         sband = rx->local->hw.wiphy->bands[status->band];
3108                         sta_opmode.bw =
3109                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3110                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3111
3112                         rate_control_rate_update(local, sband, rx->sta,
3113                                                  IEEE80211_RC_BW_CHANGED);
3114                         cfg80211_sta_opmode_change_notify(sdata->dev,
3115                                                           rx->sta->addr,
3116                                                           &sta_opmode,
3117                                                           GFP_ATOMIC);
3118                         goto handled;
3119                 }
3120                 default:
3121                         goto invalid;
3122                 }
3123
3124                 break;
3125         case WLAN_CATEGORY_PUBLIC:
3126                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3127                         goto invalid;
3128                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3129                         break;
3130                 if (!rx->sta)
3131                         break;
3132                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3133                         break;
3134                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3135                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3136                         break;
3137                 if (len < offsetof(struct ieee80211_mgmt,
3138                                    u.action.u.ext_chan_switch.variable))
3139                         goto invalid;
3140                 goto queue;
3141         case WLAN_CATEGORY_VHT:
3142                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3143                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3144                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3145                     sdata->vif.type != NL80211_IFTYPE_AP &&
3146                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3147                         break;
3148
3149                 /* verify action code is present */
3150                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3151                         goto invalid;
3152
3153                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3154                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3155                         /* verify opmode is present */
3156                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3157                                 goto invalid;
3158                         goto queue;
3159                 }
3160                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3161                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3162                                 goto invalid;
3163                         goto queue;
3164                 }
3165                 default:
3166                         break;
3167                 }
3168                 break;
3169         case WLAN_CATEGORY_BACK:
3170                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3171                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3172                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3173                     sdata->vif.type != NL80211_IFTYPE_AP &&
3174                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3175                         break;
3176
3177                 /* verify action_code is present */
3178                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3179                         break;
3180
3181                 switch (mgmt->u.action.u.addba_req.action_code) {
3182                 case WLAN_ACTION_ADDBA_REQ:
3183                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3184                                    sizeof(mgmt->u.action.u.addba_req)))
3185                                 goto invalid;
3186                         break;
3187                 case WLAN_ACTION_ADDBA_RESP:
3188                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3189                                    sizeof(mgmt->u.action.u.addba_resp)))
3190                                 goto invalid;
3191                         break;
3192                 case WLAN_ACTION_DELBA:
3193                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3194                                    sizeof(mgmt->u.action.u.delba)))
3195                                 goto invalid;
3196                         break;
3197                 default:
3198                         goto invalid;
3199                 }
3200
3201                 goto queue;
3202         case WLAN_CATEGORY_SPECTRUM_MGMT:
3203                 /* verify action_code is present */
3204                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3205                         break;
3206
3207                 switch (mgmt->u.action.u.measurement.action_code) {
3208                 case WLAN_ACTION_SPCT_MSR_REQ:
3209                         if (status->band != NL80211_BAND_5GHZ)
3210                                 break;
3211
3212                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3213                                    sizeof(mgmt->u.action.u.measurement)))
3214                                 break;
3215
3216                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3217                                 break;
3218
3219                         ieee80211_process_measurement_req(sdata, mgmt, len);
3220                         goto handled;
3221                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3222                         u8 *bssid;
3223                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3224                                    sizeof(mgmt->u.action.u.chan_switch)))
3225                                 break;
3226
3227                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3228                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3229                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3230                                 break;
3231
3232                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3233                                 bssid = sdata->u.mgd.bssid;
3234                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3235                                 bssid = sdata->u.ibss.bssid;
3236                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3237                                 bssid = mgmt->sa;
3238                         else
3239                                 break;
3240
3241                         if (!ether_addr_equal(mgmt->bssid, bssid))
3242                                 break;
3243
3244                         goto queue;
3245                         }
3246                 }
3247                 break;
3248         case WLAN_CATEGORY_SA_QUERY:
3249                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3250                            sizeof(mgmt->u.action.u.sa_query)))
3251                         break;
3252
3253                 switch (mgmt->u.action.u.sa_query.action) {
3254                 case WLAN_ACTION_SA_QUERY_REQUEST:
3255                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3256                                 break;
3257                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3258                         goto handled;
3259                 }
3260                 break;
3261         case WLAN_CATEGORY_SELF_PROTECTED:
3262                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3263                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3264                         break;
3265
3266                 switch (mgmt->u.action.u.self_prot.action_code) {
3267                 case WLAN_SP_MESH_PEERING_OPEN:
3268                 case WLAN_SP_MESH_PEERING_CLOSE:
3269                 case WLAN_SP_MESH_PEERING_CONFIRM:
3270                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3271                                 goto invalid;
3272                         if (sdata->u.mesh.user_mpm)
3273                                 /* userspace handles this frame */
3274                                 break;
3275                         goto queue;
3276                 case WLAN_SP_MGK_INFORM:
3277                 case WLAN_SP_MGK_ACK:
3278                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3279                                 goto invalid;
3280                         break;
3281                 }
3282                 break;
3283         case WLAN_CATEGORY_MESH_ACTION:
3284                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3285                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3286                         break;
3287
3288                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3289                         break;
3290                 if (mesh_action_is_path_sel(mgmt) &&
3291                     !mesh_path_sel_is_hwmp(sdata))
3292                         break;
3293                 goto queue;
3294         }
3295
3296         return RX_CONTINUE;
3297
3298  invalid:
3299         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3300         /* will return in the next handlers */
3301         return RX_CONTINUE;
3302
3303  handled:
3304         if (rx->sta)
3305                 rx->sta->rx_stats.packets++;
3306         dev_kfree_skb(rx->skb);
3307         return RX_QUEUED;
3308
3309  queue:
3310         skb_queue_tail(&sdata->skb_queue, rx->skb);
3311         ieee80211_queue_work(&local->hw, &sdata->work);
3312         if (rx->sta)
3313                 rx->sta->rx_stats.packets++;
3314         return RX_QUEUED;
3315 }
3316
3317 static ieee80211_rx_result debug_noinline
3318 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3319 {
3320         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3321         int sig = 0;
3322
3323         /* skip known-bad action frames and return them in the next handler */
3324         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3325                 return RX_CONTINUE;
3326
3327         /*
3328          * Getting here means the kernel doesn't know how to handle
3329          * it, but maybe userspace does ... include returned frames
3330          * so userspace can register for those to know whether ones
3331          * it transmitted were processed or returned.
3332          */
3333
3334         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3335             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3336                 sig = status->signal;
3337
3338         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3339                              rx->skb->data, rx->skb->len, 0)) {
3340                 if (rx->sta)
3341                         rx->sta->rx_stats.packets++;
3342                 dev_kfree_skb(rx->skb);
3343                 return RX_QUEUED;
3344         }
3345
3346         return RX_CONTINUE;
3347 }
3348
3349 static ieee80211_rx_result debug_noinline
3350 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3351 {
3352         struct ieee80211_local *local = rx->local;
3353         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3354         struct sk_buff *nskb;
3355         struct ieee80211_sub_if_data *sdata = rx->sdata;
3356         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3357
3358         if (!ieee80211_is_action(mgmt->frame_control))
3359                 return RX_CONTINUE;
3360
3361         /*
3362          * For AP mode, hostapd is responsible for handling any action
3363          * frames that we didn't handle, including returning unknown
3364          * ones. For all other modes we will return them to the sender,
3365          * setting the 0x80 bit in the action category, as required by
3366          * 802.11-2012 9.24.4.
3367          * Newer versions of hostapd shall also use the management frame
3368          * registration mechanisms, but older ones still use cooked
3369          * monitor interfaces so push all frames there.
3370          */
3371         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3372             (sdata->vif.type == NL80211_IFTYPE_AP ||
3373              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3374                 return RX_DROP_MONITOR;
3375
3376         if (is_multicast_ether_addr(mgmt->da))
3377                 return RX_DROP_MONITOR;
3378
3379         /* do not return rejected action frames */
3380         if (mgmt->u.action.category & 0x80)
3381                 return RX_DROP_UNUSABLE;
3382
3383         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3384                                GFP_ATOMIC);
3385         if (nskb) {
3386                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3387
3388                 nmgmt->u.action.category |= 0x80;
3389                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3390                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3391
3392                 memset(nskb->cb, 0, sizeof(nskb->cb));
3393
3394                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3395                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3396
3397                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3398                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3399                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3400                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3401                                 info->hw_queue =
3402                                         local->hw.offchannel_tx_hw_queue;
3403                 }
3404
3405                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3406                                             status->band, 0);
3407         }
3408         dev_kfree_skb(rx->skb);
3409         return RX_QUEUED;
3410 }
3411
3412 static ieee80211_rx_result debug_noinline
3413 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3414 {
3415         struct ieee80211_sub_if_data *sdata = rx->sdata;
3416         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3417         __le16 stype;
3418
3419         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3420
3421         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3422             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3423             sdata->vif.type != NL80211_IFTYPE_OCB &&
3424             sdata->vif.type != NL80211_IFTYPE_STATION)
3425                 return RX_DROP_MONITOR;
3426
3427         switch (stype) {
3428         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3429         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3430         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3431                 /* process for all: mesh, mlme, ibss */
3432                 break;
3433         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3434         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3435         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3436         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3437                 if (is_multicast_ether_addr(mgmt->da) &&
3438                     !is_broadcast_ether_addr(mgmt->da))
3439                         return RX_DROP_MONITOR;
3440
3441                 /* process only for station */
3442                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3443                         return RX_DROP_MONITOR;
3444                 break;
3445         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3446                 /* process only for ibss and mesh */
3447                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3448                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3449                         return RX_DROP_MONITOR;
3450                 break;
3451         default:
3452                 return RX_DROP_MONITOR;
3453         }
3454
3455         /* queue up frame and kick off work to process it */
3456         skb_queue_tail(&sdata->skb_queue, rx->skb);
3457         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3458         if (rx->sta)
3459                 rx->sta->rx_stats.packets++;
3460
3461         return RX_QUEUED;
3462 }
3463
3464 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3465                                         struct ieee80211_rate *rate)
3466 {
3467         struct ieee80211_sub_if_data *sdata;
3468         struct ieee80211_local *local = rx->local;
3469         struct sk_buff *skb = rx->skb, *skb2;
3470         struct net_device *prev_dev = NULL;
3471         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3472         int needed_headroom;
3473
3474         /*
3475          * If cooked monitor has been processed already, then
3476          * don't do it again. If not, set the flag.
3477          */
3478         if (rx->flags & IEEE80211_RX_CMNTR)
3479                 goto out_free_skb;
3480         rx->flags |= IEEE80211_RX_CMNTR;
3481
3482         /* If there are no cooked monitor interfaces, just free the SKB */
3483         if (!local->cooked_mntrs)
3484                 goto out_free_skb;
3485
3486         /* vendor data is long removed here */
3487         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3488         /* room for the radiotap header based on driver features */
3489         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3490
3491         if (skb_headroom(skb) < needed_headroom &&
3492             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3493                 goto out_free_skb;
3494
3495         /* prepend radiotap information */
3496         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3497                                          false);
3498
3499         skb_reset_mac_header(skb);
3500         skb->ip_summed = CHECKSUM_UNNECESSARY;
3501         skb->pkt_type = PACKET_OTHERHOST;
3502         skb->protocol = htons(ETH_P_802_2);
3503
3504         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3505                 if (!ieee80211_sdata_running(sdata))
3506                         continue;
3507
3508                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3509                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3510                         continue;
3511
3512                 if (prev_dev) {
3513                         skb2 = skb_clone(skb, GFP_ATOMIC);
3514                         if (skb2) {
3515                                 skb2->dev = prev_dev;
3516                                 netif_receive_skb(skb2);
3517                         }
3518                 }
3519
3520                 prev_dev = sdata->dev;
3521                 ieee80211_rx_stats(sdata->dev, skb->len);
3522         }
3523
3524         if (prev_dev) {
3525                 skb->dev = prev_dev;
3526                 netif_receive_skb(skb);
3527                 return;
3528         }
3529
3530  out_free_skb:
3531         dev_kfree_skb(skb);
3532 }
3533
3534 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3535                                          ieee80211_rx_result res)
3536 {
3537         switch (res) {
3538         case RX_DROP_MONITOR:
3539                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3540                 if (rx->sta)
3541                         rx->sta->rx_stats.dropped++;
3542                 /* fall through */
3543         case RX_CONTINUE: {
3544                 struct ieee80211_rate *rate = NULL;
3545                 struct ieee80211_supported_band *sband;
3546                 struct ieee80211_rx_status *status;
3547
3548                 status = IEEE80211_SKB_RXCB((rx->skb));
3549
3550                 sband = rx->local->hw.wiphy->bands[status->band];
3551                 if (status->encoding == RX_ENC_LEGACY)
3552                         rate = &sband->bitrates[status->rate_idx];
3553
3554                 ieee80211_rx_cooked_monitor(rx, rate);
3555                 break;
3556                 }
3557         case RX_DROP_UNUSABLE:
3558                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3559                 if (rx->sta)
3560                         rx->sta->rx_stats.dropped++;
3561                 dev_kfree_skb(rx->skb);
3562                 break;
3563         case RX_QUEUED:
3564                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3565                 break;
3566         }
3567 }
3568
3569 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3570                                   struct sk_buff_head *frames)
3571 {
3572         ieee80211_rx_result res = RX_DROP_MONITOR;
3573         struct sk_buff *skb;
3574
3575 #define CALL_RXH(rxh)                   \
3576         do {                            \
3577                 res = rxh(rx);          \
3578                 if (res != RX_CONTINUE) \
3579                         goto rxh_next;  \
3580         } while (0)
3581
3582         /* Lock here to avoid hitting all of the data used in the RX
3583          * path (e.g. key data, station data, ...) concurrently when
3584          * a frame is released from the reorder buffer due to timeout
3585          * from the timer, potentially concurrently with RX from the
3586          * driver.
3587          */
3588         spin_lock_bh(&rx->local->rx_path_lock);
3589
3590         while ((skb = __skb_dequeue(frames))) {
3591                 /*
3592                  * all the other fields are valid across frames
3593                  * that belong to an aMPDU since they are on the
3594                  * same TID from the same station
3595                  */
3596                 rx->skb = skb;
3597
3598                 CALL_RXH(ieee80211_rx_h_check_more_data);
3599                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3600                 CALL_RXH(ieee80211_rx_h_sta_process);
3601                 CALL_RXH(ieee80211_rx_h_decrypt);
3602                 CALL_RXH(ieee80211_rx_h_defragment);
3603                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3604                 /* must be after MMIC verify so header is counted in MPDU mic */
3605 #ifdef CONFIG_MAC80211_MESH
3606                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3607                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3608 #endif
3609                 CALL_RXH(ieee80211_rx_h_amsdu);
3610                 CALL_RXH(ieee80211_rx_h_data);
3611
3612                 /* special treatment -- needs the queue */
3613                 res = ieee80211_rx_h_ctrl(rx, frames);
3614                 if (res != RX_CONTINUE)
3615                         goto rxh_next;
3616
3617                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3618                 CALL_RXH(ieee80211_rx_h_action);
3619                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3620                 CALL_RXH(ieee80211_rx_h_action_return);
3621                 CALL_RXH(ieee80211_rx_h_mgmt);
3622
3623  rxh_next:
3624                 ieee80211_rx_handlers_result(rx, res);
3625
3626 #undef CALL_RXH
3627         }
3628
3629         spin_unlock_bh(&rx->local->rx_path_lock);
3630 }
3631
3632 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3633 {
3634         struct sk_buff_head reorder_release;
3635         ieee80211_rx_result res = RX_DROP_MONITOR;
3636
3637         __skb_queue_head_init(&reorder_release);
3638
3639 #define CALL_RXH(rxh)                   \
3640         do {                            \
3641                 res = rxh(rx);          \
3642                 if (res != RX_CONTINUE) \
3643                         goto rxh_next;  \
3644         } while (0)
3645
3646         CALL_RXH(ieee80211_rx_h_check_dup);
3647         CALL_RXH(ieee80211_rx_h_check);
3648
3649         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3650
3651         ieee80211_rx_handlers(rx, &reorder_release);
3652         return;
3653
3654  rxh_next:
3655         ieee80211_rx_handlers_result(rx, res);
3656
3657 #undef CALL_RXH
3658 }
3659
3660 /*
3661  * This function makes calls into the RX path, therefore
3662  * it has to be invoked under RCU read lock.
3663  */
3664 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3665 {
3666         struct sk_buff_head frames;
3667         struct ieee80211_rx_data rx = {
3668                 .sta = sta,
3669                 .sdata = sta->sdata,
3670                 .local = sta->local,
3671                 /* This is OK -- must be QoS data frame */
3672                 .security_idx = tid,
3673                 .seqno_idx = tid,
3674                 .napi = NULL, /* must be NULL to not have races */
3675         };
3676         struct tid_ampdu_rx *tid_agg_rx;
3677
3678         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3679         if (!tid_agg_rx)
3680                 return;
3681
3682         __skb_queue_head_init(&frames);
3683
3684         spin_lock(&tid_agg_rx->reorder_lock);
3685         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3686         spin_unlock(&tid_agg_rx->reorder_lock);
3687
3688         if (!skb_queue_empty(&frames)) {
3689                 struct ieee80211_event event = {
3690                         .type = BA_FRAME_TIMEOUT,
3691                         .u.ba.tid = tid,
3692                         .u.ba.sta = &sta->sta,
3693                 };
3694                 drv_event_callback(rx.local, rx.sdata, &event);
3695         }
3696
3697         ieee80211_rx_handlers(&rx, &frames);
3698 }
3699
3700 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3701                                           u16 ssn, u64 filtered,
3702                                           u16 received_mpdus)
3703 {
3704         struct sta_info *sta;
3705         struct tid_ampdu_rx *tid_agg_rx;
3706         struct sk_buff_head frames;
3707         struct ieee80211_rx_data rx = {
3708                 /* This is OK -- must be QoS data frame */
3709                 .security_idx = tid,
3710                 .seqno_idx = tid,
3711         };
3712         int i, diff;
3713
3714         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3715                 return;
3716
3717         __skb_queue_head_init(&frames);
3718
3719         sta = container_of(pubsta, struct sta_info, sta);
3720
3721         rx.sta = sta;
3722         rx.sdata = sta->sdata;
3723         rx.local = sta->local;
3724
3725         rcu_read_lock();
3726         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3727         if (!tid_agg_rx)
3728                 goto out;
3729
3730         spin_lock_bh(&tid_agg_rx->reorder_lock);
3731
3732         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3733                 int release;
3734
3735                 /* release all frames in the reorder buffer */
3736                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3737                            IEEE80211_SN_MODULO;
3738                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3739                                                  release, &frames);
3740                 /* update ssn to match received ssn */
3741                 tid_agg_rx->head_seq_num = ssn;
3742         } else {
3743                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3744                                                  &frames);
3745         }
3746
3747         /* handle the case that received ssn is behind the mac ssn.
3748          * it can be tid_agg_rx->buf_size behind and still be valid */
3749         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3750         if (diff >= tid_agg_rx->buf_size) {
3751                 tid_agg_rx->reorder_buf_filtered = 0;
3752                 goto release;
3753         }
3754         filtered = filtered >> diff;
3755         ssn += diff;
3756
3757         /* update bitmap */
3758         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3759                 int index = (ssn + i) % tid_agg_rx->buf_size;
3760
3761                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3762                 if (filtered & BIT_ULL(i))
3763                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3764         }
3765
3766         /* now process also frames that the filter marking released */
3767         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3768
3769 release:
3770         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3771
3772         ieee80211_rx_handlers(&rx, &frames);
3773
3774  out:
3775         rcu_read_unlock();
3776 }
3777 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3778
3779 /* main receive path */
3780
3781 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3782 {
3783         struct ieee80211_sub_if_data *sdata = rx->sdata;
3784         struct sk_buff *skb = rx->skb;
3785         struct ieee80211_hdr *hdr = (void *)skb->data;
3786         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3787         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3788         bool multicast = is_multicast_ether_addr(hdr->addr1);
3789
3790         switch (sdata->vif.type) {
3791         case NL80211_IFTYPE_STATION:
3792                 if (!bssid && !sdata->u.mgd.use_4addr)
3793                         return false;
3794                 if (multicast)
3795                         return true;
3796                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3797         case NL80211_IFTYPE_ADHOC:
3798                 if (!bssid)
3799                         return false;
3800                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3801                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3802                         return false;
3803                 if (ieee80211_is_beacon(hdr->frame_control))
3804                         return true;
3805                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3806                         return false;
3807                 if (!multicast &&
3808                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3809                         return false;
3810                 if (!rx->sta) {
3811                         int rate_idx;
3812                         if (status->encoding != RX_ENC_LEGACY)
3813                                 rate_idx = 0; /* TODO: HT/VHT rates */
3814                         else
3815                                 rate_idx = status->rate_idx;
3816                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3817                                                  BIT(rate_idx));
3818                 }
3819                 return true;
3820         case NL80211_IFTYPE_OCB:
3821                 if (!bssid)
3822                         return false;
3823                 if (!ieee80211_is_data_present(hdr->frame_control))
3824                         return false;
3825                 if (!is_broadcast_ether_addr(bssid))
3826                         return false;
3827                 if (!multicast &&
3828                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3829                         return false;
3830                 if (!rx->sta) {
3831                         int rate_idx;
3832                         if (status->encoding != RX_ENC_LEGACY)
3833                                 rate_idx = 0; /* TODO: HT rates */
3834                         else
3835                                 rate_idx = status->rate_idx;
3836                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3837                                                 BIT(rate_idx));
3838                 }
3839                 return true;
3840         case NL80211_IFTYPE_MESH_POINT:
3841                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3842                         return false;
3843                 if (multicast)
3844                         return true;
3845                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3846         case NL80211_IFTYPE_AP_VLAN:
3847         case NL80211_IFTYPE_AP:
3848                 if (!bssid)
3849                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3850
3851                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3852                         /*
3853                          * Accept public action frames even when the
3854                          * BSSID doesn't match, this is used for P2P
3855                          * and location updates. Note that mac80211
3856                          * itself never looks at these frames.
3857                          */
3858                         if (!multicast &&
3859                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3860                                 return false;
3861                         if (ieee80211_is_public_action(hdr, skb->len))
3862                                 return true;
3863                         return ieee80211_is_beacon(hdr->frame_control);
3864                 }
3865
3866                 if (!ieee80211_has_tods(hdr->frame_control)) {
3867                         /* ignore data frames to TDLS-peers */
3868                         if (ieee80211_is_data(hdr->frame_control))
3869                                 return false;
3870                         /* ignore action frames to TDLS-peers */
3871                         if (ieee80211_is_action(hdr->frame_control) &&
3872                             !is_broadcast_ether_addr(bssid) &&
3873                             !ether_addr_equal(bssid, hdr->addr1))
3874                                 return false;
3875                 }
3876
3877                 /*
3878                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3879                  * the BSSID - we've checked that already but may have accepted
3880                  * the wildcard (ff:ff:ff:ff:ff:ff).
3881                  *
3882                  * It also says:
3883                  *      The BSSID of the Data frame is determined as follows:
3884                  *      a) If the STA is contained within an AP or is associated
3885                  *         with an AP, the BSSID is the address currently in use
3886                  *         by the STA contained in the AP.
3887                  *
3888                  * So we should not accept data frames with an address that's
3889                  * multicast.
3890                  *
3891                  * Accepting it also opens a security problem because stations
3892                  * could encrypt it with the GTK and inject traffic that way.
3893                  */
3894                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3895                         return false;
3896
3897                 return true;
3898         case NL80211_IFTYPE_WDS:
3899                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3900                         return false;
3901                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3902         case NL80211_IFTYPE_P2P_DEVICE:
3903                 return ieee80211_is_public_action(hdr, skb->len) ||
3904                        ieee80211_is_probe_req(hdr->frame_control) ||
3905                        ieee80211_is_probe_resp(hdr->frame_control) ||
3906                        ieee80211_is_beacon(hdr->frame_control);
3907         case NL80211_IFTYPE_NAN:
3908                 /* Currently no frames on NAN interface are allowed */
3909                 return false;
3910         default:
3911                 break;
3912         }
3913
3914         WARN_ON_ONCE(1);
3915         return false;
3916 }
3917
3918 void ieee80211_check_fast_rx(struct sta_info *sta)
3919 {
3920         struct ieee80211_sub_if_data *sdata = sta->sdata;
3921         struct ieee80211_local *local = sdata->local;
3922         struct ieee80211_key *key;
3923         struct ieee80211_fast_rx fastrx = {
3924                 .dev = sdata->dev,
3925                 .vif_type = sdata->vif.type,
3926                 .control_port_protocol = sdata->control_port_protocol,
3927         }, *old, *new = NULL;
3928         bool assign = false;
3929
3930         /* use sparse to check that we don't return without updating */
3931         __acquire(check_fast_rx);
3932
3933         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3934         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3935         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3936         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3937
3938         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3939
3940         /* fast-rx doesn't do reordering */
3941         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3942             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3943                 goto clear;
3944
3945         switch (sdata->vif.type) {
3946         case NL80211_IFTYPE_STATION:
3947                 if (sta->sta.tdls) {
3948                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3949                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3950                         fastrx.expected_ds_bits = 0;
3951                 } else {
3952                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3953                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3954                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3955                         fastrx.expected_ds_bits =
3956                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3957                 }
3958
3959                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3960                         fastrx.expected_ds_bits |=
3961                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3962                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3963                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3964                 }
3965
3966                 if (!sdata->u.mgd.powersave)
3967                         break;
3968
3969                 /* software powersave is a huge mess, avoid all of it */
3970                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3971                         goto clear;
3972                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3973                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3974                         goto clear;
3975                 break;
3976         case NL80211_IFTYPE_AP_VLAN:
3977         case NL80211_IFTYPE_AP:
3978                 /* parallel-rx requires this, at least with calls to
3979                  * ieee80211_sta_ps_transition()
3980                  */
3981                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3982                         goto clear;
3983                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3984                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3985                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3986
3987                 fastrx.internal_forward =
3988                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3989                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3990                          !sdata->u.vlan.sta);
3991
3992                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3993                     sdata->u.vlan.sta) {
3994                         fastrx.expected_ds_bits |=
3995                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3996                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3997                         fastrx.internal_forward = 0;
3998                 }
3999
4000                 break;
4001         default:
4002                 goto clear;
4003         }
4004
4005         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4006                 goto clear;
4007
4008         rcu_read_lock();
4009         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4010         if (key) {
4011                 switch (key->conf.cipher) {
4012                 case WLAN_CIPHER_SUITE_TKIP:
4013                         /* we don't want to deal with MMIC in fast-rx */
4014                         goto clear_rcu;
4015                 case WLAN_CIPHER_SUITE_CCMP:
4016                 case WLAN_CIPHER_SUITE_CCMP_256:
4017                 case WLAN_CIPHER_SUITE_GCMP:
4018                 case WLAN_CIPHER_SUITE_GCMP_256:
4019                         break;
4020                 default:
4021                         /* we also don't want to deal with WEP or cipher scheme
4022                          * since those require looking up the key idx in the
4023                          * frame, rather than assuming the PTK is used
4024                          * (we need to revisit this once we implement the real
4025                          * PTK index, which is now valid in the spec, but we
4026                          * haven't implemented that part yet)
4027                          */
4028                         goto clear_rcu;
4029                 }
4030
4031                 fastrx.key = true;
4032                 fastrx.icv_len = key->conf.icv_len;
4033         }
4034
4035         assign = true;
4036  clear_rcu:
4037         rcu_read_unlock();
4038  clear:
4039         __release(check_fast_rx);
4040
4041         if (assign)
4042                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4043
4044         spin_lock_bh(&sta->lock);
4045         old = rcu_dereference_protected(sta->fast_rx, true);
4046         rcu_assign_pointer(sta->fast_rx, new);
4047         spin_unlock_bh(&sta->lock);
4048
4049         if (old)
4050                 kfree_rcu(old, rcu_head);
4051 }
4052
4053 void ieee80211_clear_fast_rx(struct sta_info *sta)
4054 {
4055         struct ieee80211_fast_rx *old;
4056
4057         spin_lock_bh(&sta->lock);
4058         old = rcu_dereference_protected(sta->fast_rx, true);
4059         RCU_INIT_POINTER(sta->fast_rx, NULL);
4060         spin_unlock_bh(&sta->lock);
4061
4062         if (old)
4063                 kfree_rcu(old, rcu_head);
4064 }
4065
4066 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4067 {
4068         struct ieee80211_local *local = sdata->local;
4069         struct sta_info *sta;
4070
4071         lockdep_assert_held(&local->sta_mtx);
4072
4073         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4074                 if (sdata != sta->sdata &&
4075                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4076                         continue;
4077                 ieee80211_check_fast_rx(sta);
4078         }
4079 }
4080
4081 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4082 {
4083         struct ieee80211_local *local = sdata->local;
4084
4085         mutex_lock(&local->sta_mtx);
4086         __ieee80211_check_fast_rx_iface(sdata);
4087         mutex_unlock(&local->sta_mtx);
4088 }
4089
4090 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4091                                      struct ieee80211_fast_rx *fast_rx)
4092 {
4093         struct sk_buff *skb = rx->skb;
4094         struct ieee80211_hdr *hdr = (void *)skb->data;
4095         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4096         struct sta_info *sta = rx->sta;
4097         int orig_len = skb->len;
4098         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4099         int snap_offs = hdrlen;
4100         struct {
4101                 u8 snap[sizeof(rfc1042_header)];
4102                 __be16 proto;
4103         } *payload __aligned(2);
4104         struct {
4105                 u8 da[ETH_ALEN];
4106                 u8 sa[ETH_ALEN];
4107         } addrs __aligned(2);
4108         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4109
4110         if (fast_rx->uses_rss)
4111                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4112
4113         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4114          * to a common data structure; drivers can implement that per queue
4115          * but we don't have that information in mac80211
4116          */
4117         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4118                 return false;
4119
4120 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4121
4122         /* If using encryption, we also need to have:
4123          *  - PN_VALIDATED: similar, but the implementation is tricky
4124          *  - DECRYPTED: necessary for PN_VALIDATED
4125          */
4126         if (fast_rx->key &&
4127             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4128                 return false;
4129
4130         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4131                 return false;
4132
4133         if (unlikely(ieee80211_is_frag(hdr)))
4134                 return false;
4135
4136         /* Since our interface address cannot be multicast, this
4137          * implicitly also rejects multicast frames without the
4138          * explicit check.
4139          *
4140          * We shouldn't get any *data* frames not addressed to us
4141          * (AP mode will accept multicast *management* frames), but
4142          * punting here will make it go through the full checks in
4143          * ieee80211_accept_frame().
4144          */
4145         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4146                 return false;
4147
4148         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4149                                               IEEE80211_FCTL_TODS)) !=
4150             fast_rx->expected_ds_bits)
4151                 return false;
4152
4153         /* assign the key to drop unencrypted frames (later)
4154          * and strip the IV/MIC if necessary
4155          */
4156         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4157                 /* GCMP header length is the same */
4158                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4159         }
4160
4161         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4162                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4163                         goto drop;
4164
4165                 payload = (void *)(skb->data + snap_offs);
4166
4167                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4168                         return false;
4169
4170                 /* Don't handle these here since they require special code.
4171                  * Accept AARP and IPX even though they should come with a
4172                  * bridge-tunnel header - but if we get them this way then
4173                  * there's little point in discarding them.
4174                  */
4175                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4176                              payload->proto == fast_rx->control_port_protocol))
4177                         return false;
4178         }
4179
4180         /* after this point, don't punt to the slowpath! */
4181
4182         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4183             pskb_trim(skb, skb->len - fast_rx->icv_len))
4184                 goto drop;
4185
4186         if (unlikely(fast_rx->sta_notify)) {
4187                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4188                 fast_rx->sta_notify = false;
4189         }
4190
4191         /* statistics part of ieee80211_rx_h_sta_process() */
4192         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4193                 stats->last_signal = status->signal;
4194                 if (!fast_rx->uses_rss)
4195                         ewma_signal_add(&sta->rx_stats_avg.signal,
4196                                         -status->signal);
4197         }
4198
4199         if (status->chains) {
4200                 int i;
4201
4202                 stats->chains = status->chains;
4203                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4204                         int signal = status->chain_signal[i];
4205
4206                         if (!(status->chains & BIT(i)))
4207                                 continue;
4208
4209                         stats->chain_signal_last[i] = signal;
4210                         if (!fast_rx->uses_rss)
4211                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4212                                                 -signal);
4213                 }
4214         }
4215         /* end of statistics */
4216
4217         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4218                 goto drop;
4219
4220         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4221                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4222                     RX_QUEUED)
4223                         goto drop;
4224
4225                 return true;
4226         }
4227
4228         stats->last_rx = jiffies;
4229         stats->last_rate = sta_stats_encode_rate(status);
4230
4231         stats->fragments++;
4232         stats->packets++;
4233
4234         /* do the header conversion - first grab the addresses */
4235         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4236         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4237         /* remove the SNAP but leave the ethertype */
4238         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4239         /* push the addresses in front */
4240         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4241
4242         skb->dev = fast_rx->dev;
4243
4244         ieee80211_rx_stats(fast_rx->dev, skb->len);
4245
4246         /* The seqno index has the same property as needed
4247          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4248          * for non-QoS-data frames. Here we know it's a data
4249          * frame, so count MSDUs.
4250          */
4251         u64_stats_update_begin(&stats->syncp);
4252         stats->msdu[rx->seqno_idx]++;
4253         stats->bytes += orig_len;
4254         u64_stats_update_end(&stats->syncp);
4255
4256         if (fast_rx->internal_forward) {
4257                 struct sk_buff *xmit_skb = NULL;
4258                 if (is_multicast_ether_addr(addrs.da)) {
4259                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4260                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4261                            sta_info_get(rx->sdata, addrs.da)) {
4262                         xmit_skb = skb;
4263                         skb = NULL;
4264                 }
4265
4266                 if (xmit_skb) {
4267                         /*
4268                          * Send to wireless media and increase priority by 256
4269                          * to keep the received priority instead of
4270                          * reclassifying the frame (see cfg80211_classify8021d).
4271                          */
4272                         xmit_skb->priority += 256;
4273                         xmit_skb->protocol = htons(ETH_P_802_3);
4274                         skb_reset_network_header(xmit_skb);
4275                         skb_reset_mac_header(xmit_skb);
4276                         dev_queue_xmit(xmit_skb);
4277                 }
4278
4279                 if (!skb)
4280                         return true;
4281         }
4282
4283         /* deliver to local stack */
4284         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4285         memset(skb->cb, 0, sizeof(skb->cb));
4286         if (rx->napi)
4287                 napi_gro_receive(rx->napi, skb);
4288         else
4289                 netif_receive_skb(skb);
4290
4291         return true;
4292  drop:
4293         dev_kfree_skb(skb);
4294         stats->dropped++;
4295         return true;
4296 }
4297
4298 /*
4299  * This function returns whether or not the SKB
4300  * was destined for RX processing or not, which,
4301  * if consume is true, is equivalent to whether
4302  * or not the skb was consumed.
4303  */
4304 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4305                                             struct sk_buff *skb, bool consume)
4306 {
4307         struct ieee80211_local *local = rx->local;
4308         struct ieee80211_sub_if_data *sdata = rx->sdata;
4309
4310         rx->skb = skb;
4311
4312         /* See if we can do fast-rx; if we have to copy we already lost,
4313          * so punt in that case. We should never have to deliver a data
4314          * frame to multiple interfaces anyway.
4315          *
4316          * We skip the ieee80211_accept_frame() call and do the necessary
4317          * checking inside ieee80211_invoke_fast_rx().
4318          */
4319         if (consume && rx->sta) {
4320                 struct ieee80211_fast_rx *fast_rx;
4321
4322                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4323                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4324                         return true;
4325         }
4326
4327         if (!ieee80211_accept_frame(rx))
4328                 return false;
4329
4330         if (!consume) {
4331                 skb = skb_copy(skb, GFP_ATOMIC);
4332                 if (!skb) {
4333                         if (net_ratelimit())
4334                                 wiphy_debug(local->hw.wiphy,
4335                                         "failed to copy skb for %s\n",
4336                                         sdata->name);
4337                         return true;
4338                 }
4339
4340                 rx->skb = skb;
4341         }
4342
4343         ieee80211_invoke_rx_handlers(rx);
4344         return true;
4345 }
4346
4347 /*
4348  * This is the actual Rx frames handler. as it belongs to Rx path it must
4349  * be called with rcu_read_lock protection.
4350  */
4351 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4352                                          struct ieee80211_sta *pubsta,
4353                                          struct sk_buff *skb,
4354                                          struct napi_struct *napi)
4355 {
4356         struct ieee80211_local *local = hw_to_local(hw);
4357         struct ieee80211_sub_if_data *sdata;
4358         struct ieee80211_hdr *hdr;
4359         __le16 fc;
4360         struct ieee80211_rx_data rx;
4361         struct ieee80211_sub_if_data *prev;
4362         struct rhlist_head *tmp;
4363         int err = 0;
4364
4365         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4366         memset(&rx, 0, sizeof(rx));
4367         rx.skb = skb;
4368         rx.local = local;
4369         rx.napi = napi;
4370
4371         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4372                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4373
4374         if (ieee80211_is_mgmt(fc)) {
4375                 /* drop frame if too short for header */
4376                 if (skb->len < ieee80211_hdrlen(fc))
4377                         err = -ENOBUFS;
4378                 else
4379                         err = skb_linearize(skb);
4380         } else {
4381                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4382         }
4383
4384         if (err) {
4385                 dev_kfree_skb(skb);
4386                 return;
4387         }
4388
4389         hdr = (struct ieee80211_hdr *)skb->data;
4390         ieee80211_parse_qos(&rx);
4391         ieee80211_verify_alignment(&rx);
4392
4393         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4394                      ieee80211_is_beacon(hdr->frame_control)))
4395                 ieee80211_scan_rx(local, skb);
4396
4397         if (ieee80211_is_data(fc)) {
4398                 struct sta_info *sta, *prev_sta;
4399
4400                 if (pubsta) {
4401                         rx.sta = container_of(pubsta, struct sta_info, sta);
4402                         rx.sdata = rx.sta->sdata;
4403                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4404                                 return;
4405                         goto out;
4406                 }
4407
4408                 prev_sta = NULL;
4409
4410                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4411                         if (!prev_sta) {
4412                                 prev_sta = sta;
4413                                 continue;
4414                         }
4415
4416                         rx.sta = prev_sta;
4417                         rx.sdata = prev_sta->sdata;
4418                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4419
4420                         prev_sta = sta;
4421                 }
4422
4423                 if (prev_sta) {
4424                         rx.sta = prev_sta;
4425                         rx.sdata = prev_sta->sdata;
4426
4427                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4428                                 return;
4429                         goto out;
4430                 }
4431         }
4432
4433         prev = NULL;
4434
4435         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4436                 if (!ieee80211_sdata_running(sdata))
4437                         continue;
4438
4439                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4440                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4441                         continue;
4442
4443                 /*
4444                  * frame is destined for this interface, but if it's
4445                  * not also for the previous one we handle that after
4446                  * the loop to avoid copying the SKB once too much
4447                  */
4448
4449                 if (!prev) {
4450                         prev = sdata;
4451                         continue;
4452                 }
4453
4454                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4455                 rx.sdata = prev;
4456                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4457
4458                 prev = sdata;
4459         }
4460
4461         if (prev) {
4462                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4463                 rx.sdata = prev;
4464
4465                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4466                         return;
4467         }
4468
4469  out:
4470         dev_kfree_skb(skb);
4471 }
4472
4473 /*
4474  * This is the receive path handler. It is called by a low level driver when an
4475  * 802.11 MPDU is received from the hardware.
4476  */
4477 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4478                        struct sk_buff *skb, struct napi_struct *napi)
4479 {
4480         struct ieee80211_local *local = hw_to_local(hw);
4481         struct ieee80211_rate *rate = NULL;
4482         struct ieee80211_supported_band *sband;
4483         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4484
4485         WARN_ON_ONCE(softirq_count() == 0);
4486
4487         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4488                 goto drop;
4489
4490         sband = local->hw.wiphy->bands[status->band];
4491         if (WARN_ON(!sband))
4492                 goto drop;
4493
4494         /*
4495          * If we're suspending, it is possible although not too likely
4496          * that we'd be receiving frames after having already partially
4497          * quiesced the stack. We can't process such frames then since
4498          * that might, for example, cause stations to be added or other
4499          * driver callbacks be invoked.
4500          */
4501         if (unlikely(local->quiescing || local->suspended))
4502                 goto drop;
4503
4504         /* We might be during a HW reconfig, prevent Rx for the same reason */
4505         if (unlikely(local->in_reconfig))
4506                 goto drop;
4507
4508         /*
4509          * The same happens when we're not even started,
4510          * but that's worth a warning.
4511          */
4512         if (WARN_ON(!local->started))
4513                 goto drop;
4514
4515         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4516                 /*
4517                  * Validate the rate, unless a PLCP error means that
4518                  * we probably can't have a valid rate here anyway.
4519                  */
4520
4521                 switch (status->encoding) {
4522                 case RX_ENC_HT:
4523                         /*
4524                          * rate_idx is MCS index, which can be [0-76]
4525                          * as documented on:
4526                          *
4527                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4528                          *
4529                          * Anything else would be some sort of driver or
4530                          * hardware error. The driver should catch hardware
4531                          * errors.
4532                          */
4533                         if (WARN(status->rate_idx > 76,
4534                                  "Rate marked as an HT rate but passed "
4535                                  "status->rate_idx is not "
4536                                  "an MCS index [0-76]: %d (0x%02x)\n",
4537                                  status->rate_idx,
4538                                  status->rate_idx))
4539                                 goto drop;
4540                         break;
4541                 case RX_ENC_VHT:
4542                         if (WARN_ONCE(status->rate_idx > 9 ||
4543                                       !status->nss ||
4544                                       status->nss > 8,
4545                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4546                                       status->rate_idx, status->nss))
4547                                 goto drop;
4548                         break;
4549                 case RX_ENC_HE:
4550                         if (WARN_ONCE(status->rate_idx > 11 ||
4551                                       !status->nss ||
4552                                       status->nss > 8,
4553                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4554                                       status->rate_idx, status->nss))
4555                                 goto drop;
4556                         break;
4557                 default:
4558                         WARN_ON_ONCE(1);
4559                         /* fall through */
4560                 case RX_ENC_LEGACY:
4561                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4562                                 goto drop;
4563                         rate = &sband->bitrates[status->rate_idx];
4564                 }
4565         }
4566
4567         status->rx_flags = 0;
4568
4569         /*
4570          * key references and virtual interfaces are protected using RCU
4571          * and this requires that we are in a read-side RCU section during
4572          * receive processing
4573          */
4574         rcu_read_lock();
4575
4576         /*
4577          * Frames with failed FCS/PLCP checksum are not returned,
4578          * all other frames are returned without radiotap header
4579          * if it was previously present.
4580          * Also, frames with less than 16 bytes are dropped.
4581          */
4582         skb = ieee80211_rx_monitor(local, skb, rate);
4583         if (!skb) {
4584                 rcu_read_unlock();
4585                 return;
4586         }
4587
4588         ieee80211_tpt_led_trig_rx(local,
4589                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4590                         skb->len);
4591
4592         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4593
4594         rcu_read_unlock();
4595
4596         return;
4597  drop:
4598         kfree_skb(skb);
4599 }
4600 EXPORT_SYMBOL(ieee80211_rx_napi);
4601
4602 /* This is a version of the rx handler that can be called from hard irq
4603  * context. Post the skb on the queue and schedule the tasklet */
4604 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4605 {
4606         struct ieee80211_local *local = hw_to_local(hw);
4607
4608         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4609
4610         skb->pkt_type = IEEE80211_RX_MSG;
4611         skb_queue_tail(&local->skb_queue, skb);
4612         tasklet_schedule(&local->tasklet);
4613 }
4614 EXPORT_SYMBOL(ieee80211_rx_irqsafe);