net/mac80211/rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   9  * Copyright (C) 2018-2021 Intel Corporation
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <linux/kcov.h>
  21 #include <linux/bitops.h>
  22 #include <net/mac80211.h>
  23 #include <net/ieee80211_radiotap.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "led.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wpa.h"
  32 #include "tkip.h"
  33 #include "wme.h"
  34 #include "rate.h"
  35
  36 /*
  37  * monitor mode reception
  38  *
  39  * This function cleans up the SKB, i.e. it removes all the stuff
  40  * only useful for monitoring.
  41  */
  42 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
  43                                            unsigned int present_fcs_len,
  44                                            unsigned int rtap_space)
  45 {
  46         struct ieee80211_hdr *hdr;
  47         unsigned int hdrlen;
  48         __le16 fc;
  49
  50         if (present_fcs_len)
  51                 __pskb_trim(skb, skb->len - present_fcs_len);
  52         __pskb_pull(skb, rtap_space);
  53
  54         hdr = (void *)skb->data;
  55         fc = hdr->frame_control;
  56
  57         /*
  58          * Remove the HT-Control field (if present) on management
  59          * frames after we've sent the frame to monitoring. We
  60          * (currently) don't need it, and don't properly parse
  61          * frames with it present, due to the assumption of a
  62          * fixed management header length.
  63          */
  64         if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
  65                 return skb;
  66
  67         hdrlen = ieee80211_hdrlen(fc);
  68         hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
  69
  70         if (!pskb_may_pull(skb, hdrlen)) {
  71                 dev_kfree_skb(skb);
  72                 return NULL;
  73         }
  74
  75         memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
  76                 hdrlen - IEEE80211_HT_CTL_LEN);
  77         __pskb_pull(skb, IEEE80211_HT_CTL_LEN);
  78
  79         return skb;
  80 }
  81
  82 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  83                                      unsigned int rtap_space)
  84 {
  85         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  86         struct ieee80211_hdr *hdr;
  87
  88         hdr = (void *)(skb->data + rtap_space);
  89
  90         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  91                             RX_FLAG_FAILED_PLCP_CRC |
  92                             RX_FLAG_ONLY_MONITOR |
  93                             RX_FLAG_NO_PSDU))
  94                 return true;
  95
  96         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
  97                 return true;
  98
  99         if (ieee80211_is_ctl(hdr->frame_control) &&
 100             !ieee80211_is_pspoll(hdr->frame_control) &&
 101             !ieee80211_is_back_req(hdr->frame_control))
 102                 return true;
 103
 104         return false;
 105 }
 106
 107 static int
 108 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 109                              struct ieee80211_rx_status *status,
 110                              struct sk_buff *skb)
 111 {
 112         int len;
 113
 114         /* always present fields */
 115         len = sizeof(struct ieee80211_radiotap_header) + 8;
 116
 117         /* allocate extra bitmaps */
 118         if (status->chains)
 119                 len += 4 * hweight8(status->chains);
 120         /* vendor presence bitmap */
 121         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 122                 len += 4;
 123
 124         if (ieee80211_have_rx_timestamp(status)) {
 125                 len = ALIGN(len, 8);
 126                 len += 8;
 127         }
 128         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 129                 len += 1;
 130
 131         /* antenna field, if we don't have per-chain info */
 132         if (!status->chains)
 133                 len += 1;
 134
 135         /* padding for RX_FLAGS if necessary */
 136         len = ALIGN(len, 2);
 137
 138         if (status->encoding == RX_ENC_HT) /* HT info */
 139                 len += 3;
 140
 141         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 142                 len = ALIGN(len, 4);
 143                 len += 8;
 144         }
 145
 146         if (status->encoding == RX_ENC_VHT) {
 147                 len = ALIGN(len, 2);
 148                 len += 12;
 149         }
 150
 151         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 152                 len = ALIGN(len, 8);
 153                 len += 12;
 154         }
 155
 156         if (status->encoding == RX_ENC_HE &&
 157             status->flag & RX_FLAG_RADIOTAP_HE) {
 158                 len = ALIGN(len, 2);
 159                 len += 12;
 160                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 161         }
 162
 163         if (status->encoding == RX_ENC_HE &&
 164             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 165                 len = ALIGN(len, 2);
 166                 len += 12;
 167                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 168         }
 169
 170         if (status->flag & RX_FLAG_NO_PSDU)
 171                 len += 1;
 172
 173         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 174                 len = ALIGN(len, 2);
 175                 len += 4;
 176                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 177         }
 178
 179         if (status->chains) {
 180                 /* antenna and antenna signal fields */
 181                 len += 2 * hweight8(status->chains);
 182         }
 183
 184         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 185                 struct ieee80211_vendor_radiotap *rtap;
 186                 int vendor_data_offset = 0;
 187
 188                 /*
 189                  * The position to look at depends on the existence (or non-
 190                  * existence) of other elements, so take that into account...
 191                  */
 192                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 193                         vendor_data_offset +=
 194                                 sizeof(struct ieee80211_radiotap_he);
 195                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 196                         vendor_data_offset +=
 197                                 sizeof(struct ieee80211_radiotap_he_mu);
 198                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 199                         vendor_data_offset +=
 200                                 sizeof(struct ieee80211_radiotap_lsig);
 201
 202                 rtap = (void *)&skb->data[vendor_data_offset];
 203
 204                 /* alignment for fixed 6-byte vendor data header */
 205                 len = ALIGN(len, 2);
 206                 /* vendor data header */
 207                 len += 6;
 208                 if (WARN_ON(rtap->align == 0))
 209                         rtap->align = 1;
 210                 len = ALIGN(len, rtap->align);
 211                 len += rtap->len + rtap->pad;
 212         }
 213
 214         return len;
 215 }
 216
 217 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
 218                                            struct sta_info *sta,
 219                                            struct sk_buff *skb)
 220 {
 221         skb_queue_tail(&sdata->skb_queue, skb);
 222         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 223         if (sta)
 224                 sta->rx_stats.packets++;
 225 }
 226
 227 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
 228                                          struct sta_info *sta,
 229                                          struct sk_buff *skb)
 230 {
 231         skb->protocol = 0;
 232         __ieee80211_queue_skb_to_iface(sdata, sta, skb);
 233 }
 234
 235 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 236                                          struct sk_buff *skb,
 237                                          int rtap_space)
 238 {
 239         struct {
 240                 struct ieee80211_hdr_3addr hdr;
 241                 u8 category;
 242                 u8 action_code;
 243         } __packed __aligned(2) action;
 244
 245         if (!sdata)
 246                 return;
 247
 248         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 249
 250         if (skb->len < rtap_space + sizeof(action) +
 251                        VHT_MUMIMO_GROUPS_DATA_LEN)
 252                 return;
 253
 254         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 255                 return;
 256
 257         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 258
 259         if (!ieee80211_is_action(action.hdr.frame_control))
 260                 return;
 261
 262         if (action.category != WLAN_CATEGORY_VHT)
 263                 return;
 264
 265         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 266                 return;
 267
 268         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 269                 return;
 270
 271         skb = skb_copy(skb, GFP_ATOMIC);
 272         if (!skb)
 273                 return;
 274
 275         ieee80211_queue_skb_to_iface(sdata, NULL, skb);
 276 }
 277
 278 /*
 279  * ieee80211_add_rx_radiotap_header - add radiotap header
 280  *
 281  * add a radiotap header containing all the fields which the hardware provided.
 282  */
 283 static void
 284 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 285                                  struct sk_buff *skb,
 286                                  struct ieee80211_rate *rate,
 287                                  int rtap_len, bool has_fcs)
 288 {
 289         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 290         struct ieee80211_radiotap_header *rthdr;
 291         unsigned char *pos;
 292         __le32 *it_present;
 293         u32 it_present_val;
 294         u16 rx_flags = 0;
 295         u16 channel_flags = 0;
 296         int mpdulen, chain;
 297         unsigned long chains = status->chains;
 298         struct ieee80211_vendor_radiotap rtap = {};
 299         struct ieee80211_radiotap_he he = {};
 300         struct ieee80211_radiotap_he_mu he_mu = {};
 301         struct ieee80211_radiotap_lsig lsig = {};
 302
 303         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 304                 he = *(struct ieee80211_radiotap_he *)skb->data;
 305                 skb_pull(skb, sizeof(he));
 306                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 307         }
 308
 309         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 310                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 311                 skb_pull(skb, sizeof(he_mu));
 312         }
 313
 314         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 315                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 316                 skb_pull(skb, sizeof(lsig));
 317         }
 318
 319         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 320                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 321                 /* rtap.len and rtap.pad are undone immediately */
 322                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 323         }
 324
 325         mpdulen = skb->len;
 326         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 327                 mpdulen += FCS_LEN;
 328
 329         rthdr = skb_push(skb, rtap_len);
 330         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 331         it_present = &rthdr->it_present;
 332
 333         /* radiotap header, set always present flags */
 334         rthdr->it_len = cpu_to_le16(rtap_len);
 335         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 336                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 337                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 338
 339         if (!status->chains)
 340                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 341
 342         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 343                 it_present_val |=
 344                         BIT(IEEE80211_RADIOTAP_EXT) |
 345                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 346                 put_unaligned_le32(it_present_val, it_present);
 347                 it_present++;
 348                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 349                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 350         }
 351
 352         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 353                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 354                                   BIT(IEEE80211_RADIOTAP_EXT);
 355                 put_unaligned_le32(it_present_val, it_present);
 356                 it_present++;
 357                 it_present_val = rtap.present;
 358         }
 359
 360         put_unaligned_le32(it_present_val, it_present);
 361
 362         /* This references through an offset into it_optional[] rather
 363          * than via it_present otherwise later uses of pos will cause
 364          * the compiler to think we have walked past the end of the
 365          * struct member.
 366          */
 367         pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
 368
 369         /* the order of the following fields is important */
 370
 371         /* IEEE80211_RADIOTAP_TSFT */
 372         if (ieee80211_have_rx_timestamp(status)) {
 373                 /* padding */
 374                 while ((pos - (u8 *)rthdr) & 7)
 375                         *pos++ = 0;
 376                 put_unaligned_le64(
 377                         ieee80211_calculate_rx_timestamp(local, status,
 378                                                          mpdulen, 0),
 379                         pos);
 380                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
 381                 pos += 8;
 382         }
 383
 384         /* IEEE80211_RADIOTAP_FLAGS */
 385         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 386                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 387         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 388                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 389         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 390                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 391         pos++;
 392
 393         /* IEEE80211_RADIOTAP_RATE */
 394         if (!rate || status->encoding != RX_ENC_LEGACY) {
 395                 /*
 396                  * Without rate information don't add it. If we have,
 397                  * MCS information is a separate field in radiotap,
 398                  * added below. The byte here is needed as padding
 399                  * for the channel though, so initialise it to 0.
 400                  */
 401                 *pos = 0;
 402         } else {
 403                 int shift = 0;
 404                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 405                 if (status->bw == RATE_INFO_BW_10)
 406                         shift = 1;
 407                 else if (status->bw == RATE_INFO_BW_5)
 408                         shift = 2;
 409                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 410         }
 411         pos++;
 412
 413         /* IEEE80211_RADIOTAP_CHANNEL */
 414         /* TODO: frequency offset in KHz */
 415         put_unaligned_le16(status->freq, pos);
 416         pos += 2;
 417         if (status->bw == RATE_INFO_BW_10)
 418                 channel_flags |= IEEE80211_CHAN_HALF;
 419         else if (status->bw == RATE_INFO_BW_5)
 420                 channel_flags |= IEEE80211_CHAN_QUARTER;
 421
 422         if (status->band == NL80211_BAND_5GHZ ||
 423             status->band == NL80211_BAND_6GHZ)
 424                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 425         else if (status->encoding != RX_ENC_LEGACY)
 426                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 427         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 428                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 429         else if (rate)
 430                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 431         else
 432                 channel_flags |= IEEE80211_CHAN_2GHZ;
 433         put_unaligned_le16(channel_flags, pos);
 434         pos += 2;
 435
 436         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 437         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 438             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 439                 *pos = status->signal;
 440                 rthdr->it_present |=
 441                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
 442                 pos++;
 443         }
 444
 445         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 446
 447         if (!status->chains) {
 448                 /* IEEE80211_RADIOTAP_ANTENNA */
 449                 *pos = status->antenna;
 450                 pos++;
 451         }
 452
 453         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 454
 455         /* IEEE80211_RADIOTAP_RX_FLAGS */
 456         /* ensure 2 byte alignment for the 2 byte field as required */
 457         if ((pos - (u8 *)rthdr) & 1)
 458                 *pos++ = 0;
 459         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 460                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 461         put_unaligned_le16(rx_flags, pos);
 462         pos += 2;
 463
 464         if (status->encoding == RX_ENC_HT) {
 465                 unsigned int stbc;
 466
 467                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 468                 *pos++ = local->hw.radiotap_mcs_details;
 469                 *pos = 0;
 470                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 471                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 472                 if (status->bw == RATE_INFO_BW_40)
 473                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 474                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 475                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 476                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 477                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 478                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 479                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 480                 pos++;
 481                 *pos++ = status->rate_idx;
 482         }
 483
 484         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 485                 u16 flags = 0;
 486
 487                 /* ensure 4 byte alignment */
 488                 while ((pos - (u8 *)rthdr) & 3)
 489                         pos++;
 490                 rthdr->it_present |=
 491                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
 492                 put_unaligned_le32(status->ampdu_reference, pos);
 493                 pos += 4;
 494                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 495                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 496                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 497                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 498                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 499                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 500                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 501                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 502                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 503                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 504                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 505                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 506                 put_unaligned_le16(flags, pos);
 507                 pos += 2;
 508                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 509                         *pos++ = status->ampdu_delimiter_crc;
 510                 else
 511                         *pos++ = 0;
 512                 *pos++ = 0;
 513         }
 514
 515         if (status->encoding == RX_ENC_VHT) {
 516                 u16 known = local->hw.radiotap_vht_details;
 517
 518                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 519                 put_unaligned_le16(known, pos);
 520                 pos += 2;
 521                 /* flags */
 522                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 523                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 524                 /* in VHT, STBC is binary */
 525                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 526                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 527                 if (status->enc_flags & RX_ENC_FLAG_BF)
 528                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 529                 pos++;
 530                 /* bandwidth */
 531                 switch (status->bw) {
 532                 case RATE_INFO_BW_80:
 533                         *pos++ = 4;
 534                         break;
 535                 case RATE_INFO_BW_160:
 536                         *pos++ = 11;
 537                         break;
 538                 case RATE_INFO_BW_40:
 539                         *pos++ = 1;
 540                         break;
 541                 default:
 542                         *pos++ = 0;
 543                 }
 544                 /* MCS/NSS */
 545                 *pos = (status->rate_idx << 4) | status->nss;
 546                 pos += 4;
 547                 /* coding field */
 548                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 549                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 550                 pos++;
 551                 /* group ID */
 552                 pos++;
 553                 /* partial_aid */
 554                 pos += 2;
 555         }
 556
 557         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 558                 u16 accuracy = 0;
 559                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 560
 561                 rthdr->it_present |=
 562                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
 563
 564                 /* ensure 8 byte alignment */
 565                 while ((pos - (u8 *)rthdr) & 7)
 566                         pos++;
 567
 568                 put_unaligned_le64(status->device_timestamp, pos);
 569                 pos += sizeof(u64);
 570
 571                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 572                         accuracy = local->hw.radiotap_timestamp.accuracy;
 573                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 574                 }
 575                 put_unaligned_le16(accuracy, pos);
 576                 pos += sizeof(u16);
 577
 578                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 579                 *pos++ = flags;
 580         }
 581
 582         if (status->encoding == RX_ENC_HE &&
 583             status->flag & RX_FLAG_RADIOTAP_HE) {
 584 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 585
 586                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 587                         he.data6 |= HE_PREP(DATA6_NSTS,
 588                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 589                                                       status->enc_flags));
 590                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 591                 } else {
 592                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 593                 }
 594
 595 #define CHECK_GI(s) \
 596         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 597                      (int)NL80211_RATE_INFO_HE_GI_##s)
 598
 599                 CHECK_GI(0_8);
 600                 CHECK_GI(1_6);
 601                 CHECK_GI(3_2);
 602
 603                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 604                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 605                 he.data3 |= HE_PREP(DATA3_CODING,
 606                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 607
 608                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 609
 610                 switch (status->bw) {
 611                 case RATE_INFO_BW_20:
 612                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 613                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 614                         break;
 615                 case RATE_INFO_BW_40:
 616                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 617                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 618                         break;
 619                 case RATE_INFO_BW_80:
 620                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 621                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 622                         break;
 623                 case RATE_INFO_BW_160:
 624                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 625                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 626                         break;
 627                 case RATE_INFO_BW_HE_RU:
 628 #define CHECK_RU_ALLOC(s) \
 629         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 630                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 631
 632                         CHECK_RU_ALLOC(26);
 633                         CHECK_RU_ALLOC(52);
 634                         CHECK_RU_ALLOC(106);
 635                         CHECK_RU_ALLOC(242);
 636                         CHECK_RU_ALLOC(484);
 637                         CHECK_RU_ALLOC(996);
 638                         CHECK_RU_ALLOC(2x996);
 639
 640                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 641                                             status->he_ru + 4);
 642                         break;
 643                 default:
 644                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 645                 }
 646
 647                 /* ensure 2 byte alignment */
 648                 while ((pos - (u8 *)rthdr) & 1)
 649                         pos++;
 650                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 651                 memcpy(pos, &he, sizeof(he));
 652                 pos += sizeof(he);
 653         }
 654
 655         if (status->encoding == RX_ENC_HE &&
 656             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 657                 /* ensure 2 byte alignment */
 658                 while ((pos - (u8 *)rthdr) & 1)
 659                         pos++;
 660                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
 661                 memcpy(pos, &he_mu, sizeof(he_mu));
 662                 pos += sizeof(he_mu);
 663         }
 664
 665         if (status->flag & RX_FLAG_NO_PSDU) {
 666                 rthdr->it_present |=
 667                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
 668                 *pos++ = status->zero_length_psdu_type;
 669         }
 670
 671         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 672                 /* ensure 2 byte alignment */
 673                 while ((pos - (u8 *)rthdr) & 1)
 674                         pos++;
 675                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
 676                 memcpy(pos, &lsig, sizeof(lsig));
 677                 pos += sizeof(lsig);
 678         }
 679
 680         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 681                 *pos++ = status->chain_signal[chain];
 682                 *pos++ = chain;
 683         }
 684
 685         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 686                 /* ensure 2 byte alignment for the vendor field as required */
 687                 if ((pos - (u8 *)rthdr) & 1)
 688                         *pos++ = 0;
 689                 *pos++ = rtap.oui[0];
 690                 *pos++ = rtap.oui[1];
 691                 *pos++ = rtap.oui[2];
 692                 *pos++ = rtap.subns;
 693                 put_unaligned_le16(rtap.len, pos);
 694                 pos += 2;
 695                 /* align the actual payload as requested */
 696                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 697                         *pos++ = 0;
 698                 /* data (and possible padding) already follows */
 699         }
 700 }
 701
 702 static struct sk_buff *
 703 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 704                            struct sk_buff **origskb,
 705                            struct ieee80211_rate *rate,
 706                            int rtap_space, bool use_origskb)
 707 {
 708         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 709         int rt_hdrlen, needed_headroom;
 710         struct sk_buff *skb;
 711
 712         /* room for the radiotap header based on driver features */
 713         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 714         needed_headroom = rt_hdrlen - rtap_space;
 715
 716         if (use_origskb) {
 717                 /* only need to expand headroom if necessary */
 718                 skb = *origskb;
 719                 *origskb = NULL;
 720
 721                 /*
 722                  * This shouldn't trigger often because most devices have an
 723                  * RX header they pull before we get here, and that should
 724                  * be big enough for our radiotap information. We should
 725                  * probably export the length to drivers so that we can have
 726                  * them allocate enough headroom to start with.
 727                  */
 728                 if (skb_headroom(skb) < needed_headroom &&
 729                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 730                         dev_kfree_skb(skb);
 731                         return NULL;
 732                 }
 733         } else {
 734                 /*
 735                  * Need to make a copy and possibly remove radiotap header
 736                  * and FCS from the original.
 737                  */
 738                 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
 739                                       0, GFP_ATOMIC);
 740
 741                 if (!skb)
 742                         return NULL;
 743         }
 744
 745         /* prepend radiotap information */
 746         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 747
 748         skb_reset_mac_header(skb);
 749         skb->ip_summed = CHECKSUM_UNNECESSARY;
 750         skb->pkt_type = PACKET_OTHERHOST;
 751         skb->protocol = htons(ETH_P_802_2);
 752
 753         return skb;
 754 }
 755
 756 /*
 757  * This function copies a received frame to all monitor interfaces and
 758  * returns a cleaned-up SKB that no longer includes the FCS nor the
 759  * radiotap header the driver might have added.
 760  */
 761 static struct sk_buff *
 762 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 763                      struct ieee80211_rate *rate)
 764 {
 765         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 766         struct ieee80211_sub_if_data *sdata;
 767         struct sk_buff *monskb = NULL;
 768         int present_fcs_len = 0;
 769         unsigned int rtap_space = 0;
 770         struct ieee80211_sub_if_data *monitor_sdata =
 771                 rcu_dereference(local->monitor_sdata);
 772         bool only_monitor = false;
 773         unsigned int min_head_len;
 774
 775         if (status->flag & RX_FLAG_RADIOTAP_HE)
 776                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 777
 778         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 779                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 780
 781         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 782                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 783
 784         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 785                 struct ieee80211_vendor_radiotap *rtap =
 786                         (void *)(origskb->data + rtap_space);
 787
 788                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 789         }
 790
 791         min_head_len = rtap_space;
 792
 793         /*
 794          * First, we may need to make a copy of the skb because
 795          *  (1) we need to modify it for radiotap (if not present), and
 796          *  (2) the other RX handlers will modify the skb we got.
 797          *
 798          * We don't need to, of course, if we aren't going to return
 799          * the SKB because it has a bad FCS/PLCP checksum.
 800          */
 801
 802         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 803                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 804                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 805                                 /* driver bug */
 806                                 WARN_ON(1);
 807                                 dev_kfree_skb(origskb);
 808                                 return NULL;
 809                         }
 810                         present_fcs_len = FCS_LEN;
 811                 }
 812
 813                 /* also consider the hdr->frame_control */
 814                 min_head_len += 2;
 815         }
 816
 817         /* ensure that the expected data elements are in skb head */
 818         if (!pskb_may_pull(origskb, min_head_len)) {
 819                 dev_kfree_skb(origskb);
 820                 return NULL;
 821         }
 822
 823         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 824
 825         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 826                 if (only_monitor) {
 827                         dev_kfree_skb(origskb);
 828                         return NULL;
 829                 }
 830
 831                 return ieee80211_clean_skb(origskb, present_fcs_len,
 832                                            rtap_space);
 833         }
 834
 835         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 836
 837         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 838                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 839                                                  &local->mon_list);
 840
 841                 if (!monskb)
 842                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 843                                                             rate, rtap_space,
 844                                                             only_monitor &&
 845                                                             last_monitor);
 846
 847                 if (monskb) {
 848                         struct sk_buff *skb;
 849
 850                         if (last_monitor) {
 851                                 skb = monskb;
 852                                 monskb = NULL;
 853                         } else {
 854                                 skb = skb_clone(monskb, GFP_ATOMIC);
 855                         }
 856
 857                         if (skb) {
 858                                 skb->dev = sdata->dev;
 859                                 dev_sw_netstats_rx_add(skb->dev, skb->len);
 860                                 netif_receive_skb(skb);
 861                         }
 862                 }
 863
 864                 if (last_monitor)
 865                         break;
 866         }
 867
 868         /* this happens if last_monitor was erroneously false */
 869         dev_kfree_skb(monskb);
 870
 871         /* ditto */
 872         if (!origskb)
 873                 return NULL;
 874
 875         return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
 876 }
 877
 878 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 879 {
 880         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 881         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 882         int tid, seqno_idx, security_idx;
 883
 884         /* does the frame have a qos control field? */
 885         if (ieee80211_is_data_qos(hdr->frame_control)) {
 886                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 887                 /* frame has qos control */
 888                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 889                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 890                         status->rx_flags |= IEEE80211_RX_AMSDU;
 891
 892                 seqno_idx = tid;
 893                 security_idx = tid;
 894         } else {
 895                 /*
 896                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 897                  *
 898                  *      Sequence numbers for management frames, QoS data
 899                  *      frames with a broadcast/multicast address in the
 900                  *      Address 1 field, and all non-QoS data frames sent
 901                  *      by QoS STAs are assigned using an additional single
 902                  *      modulo-4096 counter, [...]
 903                  *
 904                  * We also use that counter for non-QoS STAs.
 905                  */
 906                 seqno_idx = IEEE80211_NUM_TIDS;
 907                 security_idx = 0;
 908                 if (ieee80211_is_mgmt(hdr->frame_control))
 909                         security_idx = IEEE80211_NUM_TIDS;
 910                 tid = 0;
 911         }
 912
 913         rx->seqno_idx = seqno_idx;
 914         rx->security_idx = security_idx;
 915         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 916          * For now, set skb->priority to 0 for other cases. */
 917         rx->skb->priority = (tid > 7) ? 0 : tid;
 918 }
 919
 920 /**
 921  * DOC: Packet alignment
 922  *
 923  * Drivers always need to pass packets that are aligned to two-byte boundaries
 924  * to the stack.
 925  *
 926  * Additionally, should, if possible, align the payload data in a way that
 927  * guarantees that the contained IP header is aligned to a four-byte
 928  * boundary. In the case of regular frames, this simply means aligning the
 929  * payload to a four-byte boundary (because either the IP header is directly
 930  * contained, or IV/RFC1042 headers that have a length divisible by four are
 931  * in front of it).  If the payload data is not properly aligned and the
 932  * architecture doesn't support efficient unaligned operations, mac80211
 933  * will align the data.
 934  *
 935  * With A-MSDU frames, however, the payload data address must yield two modulo
 936  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 937  * push the IP header further back to a multiple of four again. Thankfully, the
 938  * specs were sane enough this time around to require padding each A-MSDU
 939  * subframe to a length that is a multiple of four.
 940  *
 941  * Padding like Atheros hardware adds which is between the 802.11 header and
 942  * the payload is not supported, the driver is required to move the 802.11
 943  * header to be directly in front of the payload in that case.
 944  */
 945 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 946 {
 947 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 948         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 949 #endif
 950 }
 951
 952
 953 /* rx handlers */
 954
 955 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 956 {
 957         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 958
 959         if (is_multicast_ether_addr(hdr->addr1))
 960                 return 0;
 961
 962         return ieee80211_is_robust_mgmt_frame(skb);
 963 }
 964
 965
 966 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 967 {
 968         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 969
 970         if (!is_multicast_ether_addr(hdr->addr1))
 971                 return 0;
 972
 973         return ieee80211_is_robust_mgmt_frame(skb);
 974 }
 975
 976
 977 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 978 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 979 {
 980         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 981         struct ieee80211_mmie *mmie;
 982         struct ieee80211_mmie_16 *mmie16;
 983
 984         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 985                 return -1;
 986
 987         if (!ieee80211_is_robust_mgmt_frame(skb) &&
 988             !ieee80211_is_beacon(hdr->frame_control))
 989                 return -1; /* not a robust management frame */
 990
 991         mmie = (struct ieee80211_mmie *)
 992                 (skb->data + skb->len - sizeof(*mmie));
 993         if (mmie->element_id == WLAN_EID_MMIE &&
 994             mmie->length == sizeof(*mmie) - 2)
 995                 return le16_to_cpu(mmie->key_id);
 996
 997         mmie16 = (struct ieee80211_mmie_16 *)
 998                 (skb->data + skb->len - sizeof(*mmie16));
 999         if (skb->len >= 24 + sizeof(*mmie16) &&
1000             mmie16->element_id == WLAN_EID_MMIE &&
1001             mmie16->length == sizeof(*mmie16) - 2)
1002                 return le16_to_cpu(mmie16->key_id);
1003
1004         return -1;
1005 }
1006
1007 static int ieee80211_get_keyid(struct sk_buff *skb,
1008                                const struct ieee80211_cipher_scheme *cs)
1009 {
1010         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1011         __le16 fc;
1012         int hdrlen;
1013         int minlen;
1014         u8 key_idx_off;
1015         u8 key_idx_shift;
1016         u8 keyid;
1017
1018         fc = hdr->frame_control;
1019         hdrlen = ieee80211_hdrlen(fc);
1020
1021         if (cs) {
1022                 minlen = hdrlen + cs->hdr_len;
1023                 key_idx_off = hdrlen + cs->key_idx_off;
1024                 key_idx_shift = cs->key_idx_shift;
1025         } else {
1026                 /* WEP, TKIP, CCMP and GCMP */
1027                 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1028                 key_idx_off = hdrlen + 3;
1029                 key_idx_shift = 6;
1030         }
1031
1032         if (unlikely(skb->len < minlen))
1033                 return -EINVAL;
1034
1035         skb_copy_bits(skb, key_idx_off, &keyid, 1);
1036
1037         if (cs)
1038                 keyid &= cs->key_idx_mask;
1039         keyid >>= key_idx_shift;
1040
1041         /* cs could use more than the usual two bits for the keyid */
1042         if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1043                 return -EINVAL;
1044
1045         return keyid;
1046 }
1047
1048 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1049 {
1050         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1051         char *dev_addr = rx->sdata->vif.addr;
1052
1053         if (ieee80211_is_data(hdr->frame_control)) {
1054                 if (is_multicast_ether_addr(hdr->addr1)) {
1055                         if (ieee80211_has_tods(hdr->frame_control) ||
1056                             !ieee80211_has_fromds(hdr->frame_control))
1057                                 return RX_DROP_MONITOR;
1058                         if (ether_addr_equal(hdr->addr3, dev_addr))
1059                                 return RX_DROP_MONITOR;
1060                 } else {
1061                         if (!ieee80211_has_a4(hdr->frame_control))
1062                                 return RX_DROP_MONITOR;
1063                         if (ether_addr_equal(hdr->addr4, dev_addr))
1064                                 return RX_DROP_MONITOR;
1065                 }
1066         }
1067
1068         /* If there is not an established peer link and this is not a peer link
1069          * establisment frame, beacon or probe, drop the frame.
1070          */
1071
1072         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1073                 struct ieee80211_mgmt *mgmt;
1074
1075                 if (!ieee80211_is_mgmt(hdr->frame_control))
1076                         return RX_DROP_MONITOR;
1077
1078                 if (ieee80211_is_action(hdr->frame_control)) {
1079                         u8 category;
1080
1081                         /* make sure category field is present */
1082                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1083                                 return RX_DROP_MONITOR;
1084
1085                         mgmt = (struct ieee80211_mgmt *)hdr;
1086                         category = mgmt->u.action.category;
1087                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1088                             category != WLAN_CATEGORY_SELF_PROTECTED)
1089                                 return RX_DROP_MONITOR;
1090                         return RX_CONTINUE;
1091                 }
1092
1093                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1094                     ieee80211_is_probe_resp(hdr->frame_control) ||
1095                     ieee80211_is_beacon(hdr->frame_control) ||
1096                     ieee80211_is_auth(hdr->frame_control))
1097                         return RX_CONTINUE;
1098
1099                 return RX_DROP_MONITOR;
1100         }
1101
1102         return RX_CONTINUE;
1103 }
1104
1105 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1106                                               int index)
1107 {
1108         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1109         struct sk_buff *tail = skb_peek_tail(frames);
1110         struct ieee80211_rx_status *status;
1111
1112         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1113                 return true;
1114
1115         if (!tail)
1116                 return false;
1117
1118         status = IEEE80211_SKB_RXCB(tail);
1119         if (status->flag & RX_FLAG_AMSDU_MORE)
1120                 return false;
1121
1122         return true;
1123 }
1124
1125 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1126                                             struct tid_ampdu_rx *tid_agg_rx,
1127                                             int index,
1128                                             struct sk_buff_head *frames)
1129 {
1130         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1131         struct sk_buff *skb;
1132         struct ieee80211_rx_status *status;
1133
1134         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1135
1136         if (skb_queue_empty(skb_list))
1137                 goto no_frame;
1138
1139         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1140                 __skb_queue_purge(skb_list);
1141                 goto no_frame;
1142         }
1143
1144         /* release frames from the reorder ring buffer */
1145         tid_agg_rx->stored_mpdu_num--;
1146         while ((skb = __skb_dequeue(skb_list))) {
1147                 status = IEEE80211_SKB_RXCB(skb);
1148                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1149                 __skb_queue_tail(frames, skb);
1150         }
1151
1152 no_frame:
1153         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1154         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1155 }
1156
1157 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1158                                              struct tid_ampdu_rx *tid_agg_rx,
1159                                              u16 head_seq_num,
1160                                              struct sk_buff_head *frames)
1161 {
1162         int index;
1163
1164         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1165
1166         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1167                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1168                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1169                                                 frames);
1170         }
1171 }
1172
1173 /*
1174  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1175  * the skb was added to the buffer longer than this time ago, the earlier
1176  * frames that have not yet been received are assumed to be lost and the skb
1177  * can be released for processing. This may also release other skb's from the
1178  * reorder buffer if there are no additional gaps between the frames.
1179  *
1180  * Callers must hold tid_agg_rx->reorder_lock.
1181  */
1182 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1183
1184 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1185                                           struct tid_ampdu_rx *tid_agg_rx,
1186                                           struct sk_buff_head *frames)
1187 {
1188         int index, i, j;
1189
1190         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1191
1192         /* release the buffer until next missing frame */
1193         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1194         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1195             tid_agg_rx->stored_mpdu_num) {
1196                 /*
1197                  * No buffers ready to be released, but check whether any
1198                  * frames in the reorder buffer have timed out.
1199                  */
1200                 int skipped = 1;
1201                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1202                      j = (j + 1) % tid_agg_rx->buf_size) {
1203                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1204                                 skipped++;
1205                                 continue;
1206                         }
1207                         if (skipped &&
1208                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1209                                         HT_RX_REORDER_BUF_TIMEOUT))
1210                                 goto set_release_timer;
1211
1212                         /* don't leave incomplete A-MSDUs around */
1213                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1214                              i = (i + 1) % tid_agg_rx->buf_size)
1215                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1216
1217                         ht_dbg_ratelimited(sdata,
1218                                            "release an RX reorder frame due to timeout on earlier frames\n");
1219                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1220                                                         frames);
1221
1222                         /*
1223                          * Increment the head seq# also for the skipped slots.
1224                          */
1225                         tid_agg_rx->head_seq_num =
1226                                 (tid_agg_rx->head_seq_num +
1227                                  skipped) & IEEE80211_SN_MASK;
1228                         skipped = 0;
1229                 }
1230         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1231                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1232                                                 frames);
1233                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1234         }
1235
1236         if (tid_agg_rx->stored_mpdu_num) {
1237                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1238
1239                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1240                      j = (j + 1) % tid_agg_rx->buf_size) {
1241                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1242                                 break;
1243                 }
1244
1245  set_release_timer:
1246
1247                 if (!tid_agg_rx->removed)
1248                         mod_timer(&tid_agg_rx->reorder_timer,
1249                                   tid_agg_rx->reorder_time[j] + 1 +
1250                                   HT_RX_REORDER_BUF_TIMEOUT);
1251         } else {
1252                 del_timer(&tid_agg_rx->reorder_timer);
1253         }
1254 }
1255
1256 /*
1257  * As this function belongs to the RX path it must be under
1258  * rcu_read_lock protection. It returns false if the frame
1259  * can be processed immediately, true if it was consumed.
1260  */
1261 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1262                                              struct tid_ampdu_rx *tid_agg_rx,
1263                                              struct sk_buff *skb,
1264                                              struct sk_buff_head *frames)
1265 {
1266         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1267         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1268         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1269         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1270         u16 head_seq_num, buf_size;
1271         int index;
1272         bool ret = true;
1273
1274         spin_lock(&tid_agg_rx->reorder_lock);
1275
1276         /*
1277          * Offloaded BA sessions have no known starting sequence number so pick
1278          * one from first Rxed frame for this tid after BA was started.
1279          */
1280         if (unlikely(tid_agg_rx->auto_seq)) {
1281                 tid_agg_rx->auto_seq = false;
1282                 tid_agg_rx->ssn = mpdu_seq_num;
1283                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1284         }
1285
1286         buf_size = tid_agg_rx->buf_size;
1287         head_seq_num = tid_agg_rx->head_seq_num;
1288
1289         /*
1290          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1291          * be reordered.
1292          */
1293         if (unlikely(!tid_agg_rx->started)) {
1294                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1295                         ret = false;
1296                         goto out;
1297                 }
1298                 tid_agg_rx->started = true;
1299         }
1300
1301         /* frame with out of date sequence number */
1302         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1303                 dev_kfree_skb(skb);
1304                 goto out;
1305         }
1306
1307         /*
1308          * If frame the sequence number exceeds our buffering window
1309          * size release some previous frames to make room for this one.
1310          */
1311         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1312                 head_seq_num = ieee80211_sn_inc(
1313                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1314                 /* release stored frames up to new head to stack */
1315                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1316                                                  head_seq_num, frames);
1317         }
1318
1319         /* Now the new frame is always in the range of the reordering buffer */
1320
1321         index = mpdu_seq_num % tid_agg_rx->buf_size;
1322
1323         /* check if we already stored this frame */
1324         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1325                 dev_kfree_skb(skb);
1326                 goto out;
1327         }
1328
1329         /*
1330          * If the current MPDU is in the right order and nothing else
1331          * is stored we can process it directly, no need to buffer it.
1332          * If it is first but there's something stored, we may be able
1333          * to release frames after this one.
1334          */
1335         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1336             tid_agg_rx->stored_mpdu_num == 0) {
1337                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1338                         tid_agg_rx->head_seq_num =
1339                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1340                 ret = false;
1341                 goto out;
1342         }
1343
1344         /* put the frame in the reordering buffer */
1345         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1346         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1347                 tid_agg_rx->reorder_time[index] = jiffies;
1348                 tid_agg_rx->stored_mpdu_num++;
1349                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1350         }
1351
1352  out:
1353         spin_unlock(&tid_agg_rx->reorder_lock);
1354         return ret;
1355 }
1356
1357 /*
1358  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1359  * true if the MPDU was buffered, false if it should be processed.
1360  */
1361 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1362                                        struct sk_buff_head *frames)
1363 {
1364         struct sk_buff *skb = rx->skb;
1365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1366         struct sta_info *sta = rx->sta;
1367         struct tid_ampdu_rx *tid_agg_rx;
1368         u16 sc;
1369         u8 tid, ack_policy;
1370
1371         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1372             is_multicast_ether_addr(hdr->addr1))
1373                 goto dont_reorder;
1374
1375         /*
1376          * filter the QoS data rx stream according to
1377          * STA/TID and check if this STA/TID is on aggregation
1378          */
1379
1380         if (!sta)
1381                 goto dont_reorder;
1382
1383         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1384                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1385         tid = ieee80211_get_tid(hdr);
1386
1387         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1388         if (!tid_agg_rx) {
1389                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1390                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1391                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1392                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1393                                              WLAN_BACK_RECIPIENT,
1394                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1395                 goto dont_reorder;
1396         }
1397
1398         /* qos null data frames are excluded */
1399         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1400                 goto dont_reorder;
1401
1402         /* not part of a BA session */
1403         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1404                 goto dont_reorder;
1405
1406         /* new, potentially un-ordered, ampdu frame - process it */
1407
1408         /* reset session timer */
1409         if (tid_agg_rx->timeout)
1410                 tid_agg_rx->last_rx = jiffies;
1411
1412         /* if this mpdu is fragmented - terminate rx aggregation session */
1413         sc = le16_to_cpu(hdr->seq_ctrl);
1414         if (sc & IEEE80211_SCTL_FRAG) {
1415                 ieee80211_queue_skb_to_iface(rx->sdata, NULL, skb);
1416                 return;
1417         }
1418
1419         /*
1420          * No locking needed -- we will only ever process one
1421          * RX packet at a time, and thus own tid_agg_rx. All
1422          * other code manipulating it needs to (and does) make
1423          * sure that we cannot get to it any more before doing
1424          * anything with it.
1425          */
1426         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1427                                              frames))
1428                 return;
1429
1430  dont_reorder:
1431         __skb_queue_tail(frames, skb);
1432 }
1433
1434 static ieee80211_rx_result debug_noinline
1435 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1436 {
1437         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1438         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1439
1440         if (status->flag & RX_FLAG_DUP_VALIDATED)
1441                 return RX_CONTINUE;
1442
1443         /*
1444          * Drop duplicate 802.11 retransmissions
1445          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1446          */
1447
1448         if (rx->skb->len < 24)
1449                 return RX_CONTINUE;
1450
1451         if (ieee80211_is_ctl(hdr->frame_control) ||
1452             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1453             is_multicast_ether_addr(hdr->addr1))
1454                 return RX_CONTINUE;
1455
1456         if (!rx->sta)
1457                 return RX_CONTINUE;
1458
1459         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1460                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1461                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1462                 rx->sta->rx_stats.num_duplicates++;
1463                 return RX_DROP_UNUSABLE;
1464         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1465                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1466         }
1467
1468         return RX_CONTINUE;
1469 }
1470
1471 static ieee80211_rx_result debug_noinline
1472 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1473 {
1474         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1475
1476         /* Drop disallowed frame classes based on STA auth/assoc state;
1477          * IEEE 802.11, Chap 5.5.
1478          *
1479          * mac80211 filters only based on association state, i.e. it drops
1480          * Class 3 frames from not associated stations. hostapd sends
1481          * deauth/disassoc frames when needed. In addition, hostapd is
1482          * responsible for filtering on both auth and assoc states.
1483          */
1484
1485         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1486                 return ieee80211_rx_mesh_check(rx);
1487
1488         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1489                       ieee80211_is_pspoll(hdr->frame_control)) &&
1490                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1491                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1492                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1493                 /*
1494                  * accept port control frames from the AP even when it's not
1495                  * yet marked ASSOC to prevent a race where we don't set the
1496                  * assoc bit quickly enough before it sends the first frame
1497                  */
1498                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1499                     ieee80211_is_data_present(hdr->frame_control)) {
1500                         unsigned int hdrlen;
1501                         __be16 ethertype;
1502
1503                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1504
1505                         if (rx->skb->len < hdrlen + 8)
1506                                 return RX_DROP_MONITOR;
1507
1508                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1509                         if (ethertype == rx->sdata->control_port_protocol)
1510                                 return RX_CONTINUE;
1511                 }
1512
1513                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1514                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1515                                                hdr->addr2,
1516                                                GFP_ATOMIC))
1517                         return RX_DROP_UNUSABLE;
1518
1519                 return RX_DROP_MONITOR;
1520         }
1521
1522         return RX_CONTINUE;
1523 }
1524
1525
1526 static ieee80211_rx_result debug_noinline
1527 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1528 {
1529         struct ieee80211_local *local;
1530         struct ieee80211_hdr *hdr;
1531         struct sk_buff *skb;
1532
1533         local = rx->local;
1534         skb = rx->skb;
1535         hdr = (struct ieee80211_hdr *) skb->data;
1536
1537         if (!local->pspolling)
1538                 return RX_CONTINUE;
1539
1540         if (!ieee80211_has_fromds(hdr->frame_control))
1541                 /* this is not from AP */
1542                 return RX_CONTINUE;
1543
1544         if (!ieee80211_is_data(hdr->frame_control))
1545                 return RX_CONTINUE;
1546
1547         if (!ieee80211_has_moredata(hdr->frame_control)) {
1548                 /* AP has no more frames buffered for us */
1549                 local->pspolling = false;
1550                 return RX_CONTINUE;
1551         }
1552
1553         /* more data bit is set, let's request a new frame from the AP */
1554         ieee80211_send_pspoll(local, rx->sdata);
1555
1556         return RX_CONTINUE;
1557 }
1558
1559 static void sta_ps_start(struct sta_info *sta)
1560 {
1561         struct ieee80211_sub_if_data *sdata = sta->sdata;
1562         struct ieee80211_local *local = sdata->local;
1563         struct ps_data *ps;
1564         int tid;
1565
1566         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1567             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1568                 ps = &sdata->bss->ps;
1569         else
1570                 return;
1571
1572         atomic_inc(&ps->num_sta_ps);
1573         set_sta_flag(sta, WLAN_STA_PS_STA);
1574         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1575                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1576         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1577                sta->sta.addr, sta->sta.aid);
1578
1579         ieee80211_clear_fast_xmit(sta);
1580
1581         if (!sta->sta.txq[0])
1582                 return;
1583
1584         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1585                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1586
1587                 ieee80211_unschedule_txq(&local->hw, txq, false);
1588
1589                 if (txq_has_queue(txq))
1590                         set_bit(tid, &sta->txq_buffered_tids);
1591                 else
1592                         clear_bit(tid, &sta->txq_buffered_tids);
1593         }
1594 }
1595
1596 static void sta_ps_end(struct sta_info *sta)
1597 {
1598         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1599                sta->sta.addr, sta->sta.aid);
1600
1601         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1602                 /*
1603                  * Clear the flag only if the other one is still set
1604                  * so that the TX path won't start TX'ing new frames
1605                  * directly ... In the case that the driver flag isn't
1606                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1607                  */
1608                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1609                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1610                        sta->sta.addr, sta->sta.aid);
1611                 return;
1612         }
1613
1614         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1615         clear_sta_flag(sta, WLAN_STA_PS_STA);
1616         ieee80211_sta_ps_deliver_wakeup(sta);
1617 }
1618
1619 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1620 {
1621         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1622         bool in_ps;
1623
1624         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1625
1626         /* Don't let the same PS state be set twice */
1627         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1628         if ((start && in_ps) || (!start && !in_ps))
1629                 return -EINVAL;
1630
1631         if (start)
1632                 sta_ps_start(sta);
1633         else
1634                 sta_ps_end(sta);
1635
1636         return 0;
1637 }
1638 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1639
1640 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1641 {
1642         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1643
1644         if (test_sta_flag(sta, WLAN_STA_SP))
1645                 return;
1646
1647         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1648                 ieee80211_sta_ps_deliver_poll_response(sta);
1649         else
1650                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1651 }
1652 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1653
1654 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1655 {
1656         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1657         int ac = ieee80211_ac_from_tid(tid);
1658
1659         /*
1660          * If this AC is not trigger-enabled do nothing unless the
1661          * driver is calling us after it already checked.
1662          *
1663          * NB: This could/should check a separate bitmap of trigger-
1664          * enabled queues, but for now we only implement uAPSD w/o
1665          * TSPEC changes to the ACs, so they're always the same.
1666          */
1667         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1668             tid != IEEE80211_NUM_TIDS)
1669                 return;
1670
1671         /* if we are in a service period, do nothing */
1672         if (test_sta_flag(sta, WLAN_STA_SP))
1673                 return;
1674
1675         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1676                 ieee80211_sta_ps_deliver_uapsd(sta);
1677         else
1678                 set_sta_flag(sta, WLAN_STA_UAPSD);
1679 }
1680 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1681
1682 static ieee80211_rx_result debug_noinline
1683 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1684 {
1685         struct ieee80211_sub_if_data *sdata = rx->sdata;
1686         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1687         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1688
1689         if (!rx->sta)
1690                 return RX_CONTINUE;
1691
1692         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1693             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1694                 return RX_CONTINUE;
1695
1696         /*
1697          * The device handles station powersave, so don't do anything about
1698          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1699          * it to mac80211 since they're handled.)
1700          */
1701         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1702                 return RX_CONTINUE;
1703
1704         /*
1705          * Don't do anything if the station isn't already asleep. In
1706          * the uAPSD case, the station will probably be marked asleep,
1707          * in the PS-Poll case the station must be confused ...
1708          */
1709         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1710                 return RX_CONTINUE;
1711
1712         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1713                 ieee80211_sta_pspoll(&rx->sta->sta);
1714
1715                 /* Free PS Poll skb here instead of returning RX_DROP that would
1716                  * count as an dropped frame. */
1717                 dev_kfree_skb(rx->skb);
1718
1719                 return RX_QUEUED;
1720         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1721                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1722                    ieee80211_has_pm(hdr->frame_control) &&
1723                    (ieee80211_is_data_qos(hdr->frame_control) ||
1724                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1725                 u8 tid = ieee80211_get_tid(hdr);
1726
1727                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1728         }
1729
1730         return RX_CONTINUE;
1731 }
1732
1733 static ieee80211_rx_result debug_noinline
1734 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1735 {
1736         struct sta_info *sta = rx->sta;
1737         struct sk_buff *skb = rx->skb;
1738         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1739         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1740         int i;
1741
1742         if (!sta)
1743                 return RX_CONTINUE;
1744
1745         /*
1746          * Update last_rx only for IBSS packets which are for the current
1747          * BSSID and for station already AUTHORIZED to avoid keeping the
1748          * current IBSS network alive in cases where other STAs start
1749          * using different BSSID. This will also give the station another
1750          * chance to restart the authentication/authorization in case
1751          * something went wrong the first time.
1752          */
1753         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1754                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1755                                                 NL80211_IFTYPE_ADHOC);
1756                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1757                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1758                         sta->rx_stats.last_rx = jiffies;
1759                         if (ieee80211_is_data(hdr->frame_control) &&
1760                             !is_multicast_ether_addr(hdr->addr1))
1761                                 sta->rx_stats.last_rate =
1762                                         sta_stats_encode_rate(status);
1763                 }
1764         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1765                 sta->rx_stats.last_rx = jiffies;
1766         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1767                    !is_multicast_ether_addr(hdr->addr1)) {
1768                 /*
1769                  * Mesh beacons will update last_rx when if they are found to
1770                  * match the current local configuration when processed.
1771                  */
1772                 sta->rx_stats.last_rx = jiffies;
1773                 if (ieee80211_is_data(hdr->frame_control))
1774                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1775         }
1776
1777         sta->rx_stats.fragments++;
1778
1779         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1780         sta->rx_stats.bytes += rx->skb->len;
1781         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1782
1783         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1784                 sta->rx_stats.last_signal = status->signal;
1785                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1786         }
1787
1788         if (status->chains) {
1789                 sta->rx_stats.chains = status->chains;
1790                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1791                         int signal = status->chain_signal[i];
1792
1793                         if (!(status->chains & BIT(i)))
1794                                 continue;
1795
1796                         sta->rx_stats.chain_signal_last[i] = signal;
1797                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1798                                         -signal);
1799                 }
1800         }
1801
1802         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1803                 return RX_CONTINUE;
1804
1805         /*
1806          * Change STA power saving mode only at the end of a frame
1807          * exchange sequence, and only for a data or management
1808          * frame as specified in IEEE 802.11-2016 11.2.3.2
1809          */
1810         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1811             !ieee80211_has_morefrags(hdr->frame_control) &&
1812             !is_multicast_ether_addr(hdr->addr1) &&
1813             (ieee80211_is_mgmt(hdr->frame_control) ||
1814              ieee80211_is_data(hdr->frame_control)) &&
1815             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1816             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1817              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1818                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1819                         if (!ieee80211_has_pm(hdr->frame_control))
1820                                 sta_ps_end(sta);
1821                 } else {
1822                         if (ieee80211_has_pm(hdr->frame_control))
1823                                 sta_ps_start(sta);
1824                 }
1825         }
1826
1827         /* mesh power save support */
1828         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1829                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1830
1831         /*
1832          * Drop (qos-)data::nullfunc frames silently, since they
1833          * are used only to control station power saving mode.
1834          */
1835         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1836                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1837
1838                 /*
1839                  * If we receive a 4-addr nullfunc frame from a STA
1840                  * that was not moved to a 4-addr STA vlan yet send
1841                  * the event to userspace and for older hostapd drop
1842                  * the frame to the monitor interface.
1843                  */
1844                 if (ieee80211_has_a4(hdr->frame_control) &&
1845                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1846                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847                       !rx->sdata->u.vlan.sta))) {
1848                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1849                                 cfg80211_rx_unexpected_4addr_frame(
1850                                         rx->sdata->dev, sta->sta.addr,
1851                                         GFP_ATOMIC);
1852                         return RX_DROP_MONITOR;
1853                 }
1854                 /*
1855                  * Update counter and free packet here to avoid
1856                  * counting this as a dropped packed.
1857                  */
1858                 sta->rx_stats.packets++;
1859                 dev_kfree_skb(rx->skb);
1860                 return RX_QUEUED;
1861         }
1862
1863         return RX_CONTINUE;
1864 } /* ieee80211_rx_h_sta_process */
1865
1866 static struct ieee80211_key *
1867 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1868 {
1869         struct ieee80211_key *key = NULL;
1870         struct ieee80211_sub_if_data *sdata = rx->sdata;
1871         int idx2;
1872
1873         /* Make sure key gets set if either BIGTK key index is set so that
1874          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1875          * Beacon frames and Beacon frames that claim to use another BIGTK key
1876          * index (i.e., a key that we do not have).
1877          */
1878
1879         if (idx < 0) {
1880                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1881                 idx2 = idx + 1;
1882         } else {
1883                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1884                         idx2 = idx + 1;
1885                 else
1886                         idx2 = idx - 1;
1887         }
1888
1889         if (rx->sta)
1890                 key = rcu_dereference(rx->sta->gtk[idx]);
1891         if (!key)
1892                 key = rcu_dereference(sdata->keys[idx]);
1893         if (!key && rx->sta)
1894                 key = rcu_dereference(rx->sta->gtk[idx2]);
1895         if (!key)
1896                 key = rcu_dereference(sdata->keys[idx2]);
1897
1898         return key;
1899 }
1900
1901 static ieee80211_rx_result debug_noinline
1902 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1903 {
1904         struct sk_buff *skb = rx->skb;
1905         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1906         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1907         int keyidx;
1908         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1909         struct ieee80211_key *sta_ptk = NULL;
1910         struct ieee80211_key *ptk_idx = NULL;
1911         int mmie_keyidx = -1;
1912         __le16 fc;
1913         const struct ieee80211_cipher_scheme *cs = NULL;
1914
1915         if (ieee80211_is_ext(hdr->frame_control))
1916                 return RX_CONTINUE;
1917
1918         /*
1919          * Key selection 101
1920          *
1921          * There are five types of keys:
1922          *  - GTK (group keys)
1923          *  - IGTK (group keys for management frames)
1924          *  - BIGTK (group keys for Beacon frames)
1925          *  - PTK (pairwise keys)
1926          *  - STK (station-to-station pairwise keys)
1927          *
1928          * When selecting a key, we have to distinguish between multicast
1929          * (including broadcast) and unicast frames, the latter can only
1930          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1931          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1932          * then unicast frames can also use key indices like GTKs. Hence, if we
1933          * don't have a PTK/STK we check the key index for a WEP key.
1934          *
1935          * Note that in a regular BSS, multicast frames are sent by the
1936          * AP only, associated stations unicast the frame to the AP first
1937          * which then multicasts it on their behalf.
1938          *
1939          * There is also a slight problem in IBSS mode: GTKs are negotiated
1940          * with each station, that is something we don't currently handle.
1941          * The spec seems to expect that one negotiates the same key with
1942          * every station but there's no such requirement; VLANs could be
1943          * possible.
1944          */
1945
1946         /* start without a key */
1947         rx->key = NULL;
1948         fc = hdr->frame_control;
1949
1950         if (rx->sta) {
1951                 int keyid = rx->sta->ptk_idx;
1952                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1953
1954                 if (ieee80211_has_protected(fc) &&
1955                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1956                         cs = rx->sta->cipher_scheme;
1957                         keyid = ieee80211_get_keyid(rx->skb, cs);
1958
1959                         if (unlikely(keyid < 0))
1960                                 return RX_DROP_UNUSABLE;
1961
1962                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1963                 }
1964         }
1965
1966         if (!ieee80211_has_protected(fc))
1967                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1968
1969         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1970                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1971                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1972                     (status->flag & RX_FLAG_IV_STRIPPED))
1973                         return RX_CONTINUE;
1974                 /* Skip decryption if the frame is not protected. */
1975                 if (!ieee80211_has_protected(fc))
1976                         return RX_CONTINUE;
1977         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1978                 /* Broadcast/multicast robust management frame / BIP */
1979                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1980                     (status->flag & RX_FLAG_IV_STRIPPED))
1981                         return RX_CONTINUE;
1982
1983                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1984                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1985                                    NUM_DEFAULT_BEACON_KEYS) {
1986                         if (rx->sdata->dev)
1987                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1988                                                              skb->data,
1989                                                              skb->len);
1990                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1991                 }
1992
1993                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1994                 if (!rx->key)
1995                         return RX_CONTINUE; /* Beacon protection not in use */
1996         } else if (mmie_keyidx >= 0) {
1997                 /* Broadcast/multicast robust management frame / BIP */
1998                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1999                     (status->flag & RX_FLAG_IV_STRIPPED))
2000                         return RX_CONTINUE;
2001
2002                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2003                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2004                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2005                 if (rx->sta) {
2006                         if (ieee80211_is_group_privacy_action(skb) &&
2007                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2008                                 return RX_DROP_MONITOR;
2009
2010                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2011                 }
2012                 if (!rx->key)
2013                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2014         } else if (!ieee80211_has_protected(fc)) {
2015                 /*
2016                  * The frame was not protected, so skip decryption. However, we
2017                  * need to set rx->key if there is a key that could have been
2018                  * used so that the frame may be dropped if encryption would
2019                  * have been expected.
2020                  */
2021                 struct ieee80211_key *key = NULL;
2022                 struct ieee80211_sub_if_data *sdata = rx->sdata;
2023                 int i;
2024
2025                 if (ieee80211_is_beacon(fc)) {
2026                         key = ieee80211_rx_get_bigtk(rx, -1);
2027                 } else if (ieee80211_is_mgmt(fc) &&
2028                            is_multicast_ether_addr(hdr->addr1)) {
2029                         key = rcu_dereference(rx->sdata->default_mgmt_key);
2030                 } else {
2031                         if (rx->sta) {
2032                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2033                                         key = rcu_dereference(rx->sta->gtk[i]);
2034                                         if (key)
2035                                                 break;
2036                                 }
2037                         }
2038                         if (!key) {
2039                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2040                                         key = rcu_dereference(sdata->keys[i]);
2041                                         if (key)
2042                                                 break;
2043                                 }
2044                         }
2045                 }
2046                 if (key)
2047                         rx->key = key;
2048                 return RX_CONTINUE;
2049         } else {
2050                 /*
2051                  * The device doesn't give us the IV so we won't be
2052                  * able to look up the key. That's ok though, we
2053                  * don't need to decrypt the frame, we just won't
2054                  * be able to keep statistics accurate.
2055                  * Except for key threshold notifications, should
2056                  * we somehow allow the driver to tell us which key
2057                  * the hardware used if this flag is set?
2058                  */
2059                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2060                     (status->flag & RX_FLAG_IV_STRIPPED))
2061                         return RX_CONTINUE;
2062
2063                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2064
2065                 if (unlikely(keyidx < 0))
2066                         return RX_DROP_UNUSABLE;
2067
2068                 /* check per-station GTK first, if multicast packet */
2069                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2070                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2071
2072                 /* if not found, try default key */
2073                 if (!rx->key) {
2074                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2075
2076                         /*
2077                          * RSNA-protected unicast frames should always be
2078                          * sent with pairwise or station-to-station keys,
2079                          * but for WEP we allow using a key index as well.
2080                          */
2081                         if (rx->key &&
2082                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2083                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2084                             !is_multicast_ether_addr(hdr->addr1))
2085                                 rx->key = NULL;
2086                 }
2087         }
2088
2089         if (rx->key) {
2090                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2091                         return RX_DROP_MONITOR;
2092
2093                 /* TODO: add threshold stuff again */
2094         } else {
2095                 return RX_DROP_MONITOR;
2096         }
2097
2098         switch (rx->key->conf.cipher) {
2099         case WLAN_CIPHER_SUITE_WEP40:
2100         case WLAN_CIPHER_SUITE_WEP104:
2101                 result = ieee80211_crypto_wep_decrypt(rx);
2102                 break;
2103         case WLAN_CIPHER_SUITE_TKIP:
2104                 result = ieee80211_crypto_tkip_decrypt(rx);
2105                 break;
2106         case WLAN_CIPHER_SUITE_CCMP:
2107                 result = ieee80211_crypto_ccmp_decrypt(
2108                         rx, IEEE80211_CCMP_MIC_LEN);
2109                 break;
2110         case WLAN_CIPHER_SUITE_CCMP_256:
2111                 result = ieee80211_crypto_ccmp_decrypt(
2112                         rx, IEEE80211_CCMP_256_MIC_LEN);
2113                 break;
2114         case WLAN_CIPHER_SUITE_AES_CMAC:
2115                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2116                 break;
2117         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2118                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2119                 break;
2120         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2121         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2122                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2123                 break;
2124         case WLAN_CIPHER_SUITE_GCMP:
2125         case WLAN_CIPHER_SUITE_GCMP_256:
2126                 result = ieee80211_crypto_gcmp_decrypt(rx);
2127                 break;
2128         default:
2129                 result = ieee80211_crypto_hw_decrypt(rx);
2130         }
2131
2132         /* the hdr variable is invalid after the decrypt handlers */
2133
2134         /* either the frame has been decrypted or will be dropped */
2135         status->flag |= RX_FLAG_DECRYPTED;
2136
2137         if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
2138                      rx->sdata->dev))
2139                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2140                                              skb->data, skb->len);
2141
2142         return result;
2143 }
2144
2145 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2146 {
2147         int i;
2148
2149         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2150                 skb_queue_head_init(&cache->entries[i].skb_list);
2151 }
2152
2153 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2154 {
2155         int i;
2156
2157         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2158                 __skb_queue_purge(&cache->entries[i].skb_list);
2159 }
2160
2161 static inline struct ieee80211_fragment_entry *
2162 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2163                          unsigned int frag, unsigned int seq, int rx_queue,
2164                          struct sk_buff **skb)
2165 {
2166         struct ieee80211_fragment_entry *entry;
2167
2168         entry = &cache->entries[cache->next++];
2169         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2170                 cache->next = 0;
2171
2172         __skb_queue_purge(&entry->skb_list);
2173
2174         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2175         *skb = NULL;
2176         entry->first_frag_time = jiffies;
2177         entry->seq = seq;
2178         entry->rx_queue = rx_queue;
2179         entry->last_frag = frag;
2180         entry->check_sequential_pn = false;
2181         entry->extra_len = 0;
2182
2183         return entry;
2184 }
2185
2186 static inline struct ieee80211_fragment_entry *
2187 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2188                           unsigned int frag, unsigned int seq,
2189                           int rx_queue, struct ieee80211_hdr *hdr)
2190 {
2191         struct ieee80211_fragment_entry *entry;
2192         int i, idx;
2193
2194         idx = cache->next;
2195         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2196                 struct ieee80211_hdr *f_hdr;
2197                 struct sk_buff *f_skb;
2198
2199                 idx--;
2200                 if (idx < 0)
2201                         idx = IEEE80211_FRAGMENT_MAX - 1;
2202
2203                 entry = &cache->entries[idx];
2204                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2205                     entry->rx_queue != rx_queue ||
2206                     entry->last_frag + 1 != frag)
2207                         continue;
2208
2209                 f_skb = __skb_peek(&entry->skb_list);
2210                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2211
2212                 /*
2213                  * Check ftype and addresses are equal, else check next fragment
2214                  */
2215                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2216                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2217                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2218                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2219                         continue;
2220
2221                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2222                         __skb_queue_purge(&entry->skb_list);
2223                         continue;
2224                 }
2225                 return entry;
2226         }
2227
2228         return NULL;
2229 }
2230
2231 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2232 {
2233         return rx->key &&
2234                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2235                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2236                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2237                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2238                 ieee80211_has_protected(fc);
2239 }
2240
2241 static ieee80211_rx_result debug_noinline
2242 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2243 {
2244         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2245         struct ieee80211_hdr *hdr;
2246         u16 sc;
2247         __le16 fc;
2248         unsigned int frag, seq;
2249         struct ieee80211_fragment_entry *entry;
2250         struct sk_buff *skb;
2251         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2252
2253         hdr = (struct ieee80211_hdr *)rx->skb->data;
2254         fc = hdr->frame_control;
2255
2256         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2257                 return RX_CONTINUE;
2258
2259         sc = le16_to_cpu(hdr->seq_ctrl);
2260         frag = sc & IEEE80211_SCTL_FRAG;
2261
2262         if (rx->sta)
2263                 cache = &rx->sta->frags;
2264
2265         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2266                 goto out;
2267
2268         if (is_multicast_ether_addr(hdr->addr1))
2269                 return RX_DROP_MONITOR;
2270
2271         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2272
2273         if (skb_linearize(rx->skb))
2274                 return RX_DROP_UNUSABLE;
2275
2276         /*
2277          *  skb_linearize() might change the skb->data and
2278          *  previously cached variables (in this case, hdr) need to
2279          *  be refreshed with the new data.
2280          */
2281         hdr = (struct ieee80211_hdr *)rx->skb->data;
2282         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2283
2284         if (frag == 0) {
2285                 /* This is the first fragment of a new frame. */
2286                 entry = ieee80211_reassemble_add(cache, frag, seq,
2287                                                  rx->seqno_idx, &(rx->skb));
2288                 if (requires_sequential_pn(rx, fc)) {
2289                         int queue = rx->security_idx;
2290
2291                         /* Store CCMP/GCMP PN so that we can verify that the
2292                          * next fragment has a sequential PN value.
2293                          */
2294                         entry->check_sequential_pn = true;
2295                         entry->is_protected = true;
2296                         entry->key_color = rx->key->color;
2297                         memcpy(entry->last_pn,
2298                                rx->key->u.ccmp.rx_pn[queue],
2299                                IEEE80211_CCMP_PN_LEN);
2300                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2301                                               u.ccmp.rx_pn) !=
2302                                      offsetof(struct ieee80211_key,
2303                                               u.gcmp.rx_pn));
2304                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2305                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2306                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2307                                      IEEE80211_GCMP_PN_LEN);
2308                 } else if (rx->key &&
2309                            (ieee80211_has_protected(fc) ||
2310                             (status->flag & RX_FLAG_DECRYPTED))) {
2311                         entry->is_protected = true;
2312                         entry->key_color = rx->key->color;
2313                 }
2314                 return RX_QUEUED;
2315         }
2316
2317         /* This is a fragment for a frame that should already be pending in
2318          * fragment cache. Add this fragment to the end of the pending entry.
2319          */
2320         entry = ieee80211_reassemble_find(cache, frag, seq,
2321                                           rx->seqno_idx, hdr);
2322         if (!entry) {
2323                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2324                 return RX_DROP_MONITOR;
2325         }
2326
2327         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2328          *  MPDU PN values are not incrementing in steps of 1."
2329          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2330          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2331          */
2332         if (entry->check_sequential_pn) {
2333                 int i;
2334                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2335
2336                 if (!requires_sequential_pn(rx, fc))
2337                         return RX_DROP_UNUSABLE;
2338
2339                 /* Prevent mixed key and fragment cache attacks */
2340                 if (entry->key_color != rx->key->color)
2341                         return RX_DROP_UNUSABLE;
2342
2343                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2344                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2345                         pn[i]++;
2346                         if (pn[i])
2347                                 break;
2348                 }
2349
2350                 rpn = rx->ccm_gcm.pn;
2351                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2352                         return RX_DROP_UNUSABLE;
2353                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2354         } else if (entry->is_protected &&
2355                    (!rx->key ||
2356                     (!ieee80211_has_protected(fc) &&
2357                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2358                     rx->key->color != entry->key_color)) {
2359                 /* Drop this as a mixed key or fragment cache attack, even
2360                  * if for TKIP Michael MIC should protect us, and WEP is a
2361                  * lost cause anyway.
2362                  */
2363                 return RX_DROP_UNUSABLE;
2364         } else if (entry->is_protected && rx->key &&
2365                    entry->key_color != rx->key->color &&
2366                    (status->flag & RX_FLAG_DECRYPTED)) {
2367                 return RX_DROP_UNUSABLE;
2368         }
2369
2370         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2371         __skb_queue_tail(&entry->skb_list, rx->skb);
2372         entry->last_frag = frag;
2373         entry->extra_len += rx->skb->len;
2374         if (ieee80211_has_morefrags(fc)) {
2375                 rx->skb = NULL;
2376                 return RX_QUEUED;
2377         }
2378
2379         rx->skb = __skb_dequeue(&entry->skb_list);
2380         if (skb_tailroom(rx->skb) < entry->extra_len) {
2381                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2382                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2383                                               GFP_ATOMIC))) {
2384                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2385                         __skb_queue_purge(&entry->skb_list);
2386                         return RX_DROP_UNUSABLE;
2387                 }
2388         }
2389         while ((skb = __skb_dequeue(&entry->skb_list))) {
2390                 skb_put_data(rx->skb, skb->data, skb->len);
2391                 dev_kfree_skb(skb);
2392         }
2393
2394  out:
2395         ieee80211_led_rx(rx->local);
2396         if (rx->sta)
2397                 rx->sta->rx_stats.packets++;
2398         return RX_CONTINUE;
2399 }
2400
2401 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2402 {
2403         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2404                 return -EACCES;
2405
2406         return 0;
2407 }
2408
2409 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2410 {
2411         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2412         struct sk_buff *skb = rx->skb;
2413         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2414
2415         /*
2416          * Pass through unencrypted frames if the hardware has
2417          * decrypted them already.
2418          */
2419         if (status->flag & RX_FLAG_DECRYPTED)
2420                 return 0;
2421
2422         /* check mesh EAPOL frames first */
2423         if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2424                      ieee80211_is_data(fc))) {
2425                 struct ieee80211s_hdr *mesh_hdr;
2426                 u16 hdr_len = ieee80211_hdrlen(fc);
2427                 u16 ethertype_offset;
2428                 __be16 ethertype;
2429
2430                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2431                         goto drop_check;
2432
2433                 /* make sure fixed part of mesh header is there, also checks skb len */
2434                 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2435                         goto drop_check;
2436
2437                 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2438                 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2439                                    sizeof(rfc1042_header);
2440
2441                 if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
2442                     ethertype == rx->sdata->control_port_protocol)
2443                         return 0;
2444         }
2445
2446 drop_check:
2447         /* Drop unencrypted frames if key is set. */
2448         if (unlikely(!ieee80211_has_protected(fc) &&
2449                      !ieee80211_is_any_nullfunc(fc) &&
2450                      ieee80211_is_data(fc) && rx->key))
2451                 return -EACCES;
2452
2453         return 0;
2454 }
2455
2456 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2457 {
2458         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2459         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2460         __le16 fc = hdr->frame_control;
2461
2462         /*
2463          * Pass through unencrypted frames if the hardware has
2464          * decrypted them already.
2465          */
2466         if (status->flag & RX_FLAG_DECRYPTED)
2467                 return 0;
2468
2469         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2470                 if (unlikely(!ieee80211_has_protected(fc) &&
2471                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2472                              rx->key)) {
2473                         if (ieee80211_is_deauth(fc) ||
2474                             ieee80211_is_disassoc(fc))
2475                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2476                                                              rx->skb->data,
2477                                                              rx->skb->len);
2478                         return -EACCES;
2479                 }
2480                 /* BIP does not use Protected field, so need to check MMIE */
2481                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2482                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2483                         if (ieee80211_is_deauth(fc) ||
2484                             ieee80211_is_disassoc(fc))
2485                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2486                                                              rx->skb->data,
2487                                                              rx->skb->len);
2488                         return -EACCES;
2489                 }
2490                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2491                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2492                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2493                                                      rx->skb->data,
2494                                                      rx->skb->len);
2495                         return -EACCES;
2496                 }
2497                 /*
2498                  * When using MFP, Action frames are not allowed prior to
2499                  * having configured keys.
2500                  */
2501                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2502                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2503                         return -EACCES;
2504         }
2505
2506         return 0;
2507 }
2508
2509 static int
2510 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2511 {
2512         struct ieee80211_sub_if_data *sdata = rx->sdata;
2513         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2514         bool check_port_control = false;
2515         struct ethhdr *ehdr;
2516         int ret;
2517
2518         *port_control = false;
2519         if (ieee80211_has_a4(hdr->frame_control) &&
2520             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2521                 return -1;
2522
2523         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2524             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2525
2526                 if (!sdata->u.mgd.use_4addr)
2527                         return -1;
2528                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2529                         check_port_control = true;
2530         }
2531
2532         if (is_multicast_ether_addr(hdr->addr1) &&
2533             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2534                 return -1;
2535
2536         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2537         if (ret < 0)
2538                 return ret;
2539
2540         ehdr = (struct ethhdr *) rx->skb->data;
2541         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2542                 *port_control = true;
2543         else if (check_port_control)
2544                 return -1;
2545
2546         return 0;
2547 }
2548
2549 /*
2550  * requires that rx->skb is a frame with ethernet header
2551  */
2552 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2553 {
2554         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2555                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2556         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2557
2558         /*
2559          * Allow EAPOL frames to us/the PAE group address regardless of
2560          * whether the frame was encrypted or not, and always disallow
2561          * all other destination addresses for them.
2562          */
2563         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2564                 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2565                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2566
2567         if (ieee80211_802_1x_port_control(rx) ||
2568             ieee80211_drop_unencrypted(rx, fc))
2569                 return false;
2570
2571         return true;
2572 }
2573
2574 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2575                                                  struct ieee80211_rx_data *rx)
2576 {
2577         struct ieee80211_sub_if_data *sdata = rx->sdata;
2578         struct net_device *dev = sdata->dev;
2579
2580         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2581                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2582                       !sdata->control_port_no_preauth)) &&
2583                      sdata->control_port_over_nl80211)) {
2584                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2585                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2586
2587                 cfg80211_rx_control_port(dev, skb, noencrypt);
2588                 dev_kfree_skb(skb);
2589         } else {
2590                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2591
2592                 memset(skb->cb, 0, sizeof(skb->cb));
2593
2594                 /*
2595                  * 802.1X over 802.11 requires that the authenticator address
2596                  * be used for EAPOL frames. However, 802.1X allows the use of
2597                  * the PAE group address instead. If the interface is part of
2598                  * a bridge and we pass the frame with the PAE group address,
2599                  * then the bridge will forward it to the network (even if the
2600                  * client was not associated yet), which isn't supposed to
2601                  * happen.
2602                  * To avoid that, rewrite the destination address to our own
2603                  * address, so that the authenticator (e.g. hostapd) will see
2604                  * the frame, but bridge won't forward it anywhere else. Note
2605                  * that due to earlier filtering, the only other address can
2606                  * be the PAE group address, unless the hardware allowed them
2607                  * through in 802.3 offloaded mode.
2608                  */
2609                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2610                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2611                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2612
2613                 /* deliver to local stack */
2614                 if (rx->list)
2615                         list_add_tail(&skb->list, rx->list);
2616                 else
2617                         netif_receive_skb(skb);
2618         }
2619 }
2620
2621 /*
2622  * requires that rx->skb is a frame with ethernet header
2623  */
2624 static void
2625 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2626 {
2627         struct ieee80211_sub_if_data *sdata = rx->sdata;
2628         struct net_device *dev = sdata->dev;
2629         struct sk_buff *skb, *xmit_skb;
2630         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2631         struct sta_info *dsta;
2632
2633         skb = rx->skb;
2634         xmit_skb = NULL;
2635
2636         dev_sw_netstats_rx_add(dev, skb->len);
2637
2638         if (rx->sta) {
2639                 /* The seqno index has the same property as needed
2640                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2641                  * for non-QoS-data frames. Here we know it's a data
2642                  * frame, so count MSDUs.
2643                  */
2644                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2645                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2646                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2647         }
2648
2649         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2650              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2651             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2652             ehdr->h_proto != rx->sdata->control_port_protocol &&
2653             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2654                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2655                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2656                         /*
2657                          * send multicast frames both to higher layers in
2658                          * local net stack and back to the wireless medium
2659                          */
2660                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2661                         if (!xmit_skb)
2662                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2663                                                     dev->name);
2664                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2665                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2666                         dsta = sta_info_get(sdata, ehdr->h_dest);
2667                         if (dsta) {
2668                                 /*
2669                                  * The destination station is associated to
2670                                  * this AP (in this VLAN), so send the frame
2671                                  * directly to it and do not pass it to local
2672                                  * net stack.
2673                                  */
2674                                 xmit_skb = skb;
2675                                 skb = NULL;
2676                         }
2677                 }
2678         }
2679
2680 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2681         if (skb) {
2682                 /* 'align' will only take the values 0 or 2 here since all
2683                  * frames are required to be aligned to 2-byte boundaries
2684                  * when being passed to mac80211; the code here works just
2685                  * as well if that isn't true, but mac80211 assumes it can
2686                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2687                  */
2688                 int align;
2689
2690                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2691                 if (align) {
2692                         if (WARN_ON(skb_headroom(skb) < 3)) {
2693                                 dev_kfree_skb(skb);
2694                                 skb = NULL;
2695                         } else {
2696                                 u8 *data = skb->data;
2697                                 size_t len = skb_headlen(skb);
2698                                 skb->data -= align;
2699                                 memmove(skb->data, data, len);
2700                                 skb_set_tail_pointer(skb, len);
2701                         }
2702                 }
2703         }
2704 #endif
2705
2706         if (skb) {
2707                 skb->protocol = eth_type_trans(skb, dev);
2708                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2709         }
2710
2711         if (xmit_skb) {
2712                 /*
2713                  * Send to wireless media and increase priority by 256 to
2714                  * keep the received priority instead of reclassifying
2715                  * the frame (see cfg80211_classify8021d).
2716                  */
2717                 xmit_skb->priority += 256;
2718                 xmit_skb->protocol = htons(ETH_P_802_3);
2719                 skb_reset_network_header(xmit_skb);
2720                 skb_reset_mac_header(xmit_skb);
2721                 dev_queue_xmit(xmit_skb);
2722         }
2723 }
2724
2725 static ieee80211_rx_result debug_noinline
2726 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2727 {
2728         struct net_device *dev = rx->sdata->dev;
2729         struct sk_buff *skb = rx->skb;
2730         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2731         __le16 fc = hdr->frame_control;
2732         struct sk_buff_head frame_list;
2733         struct ethhdr ethhdr;
2734         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2735
2736         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2737                 check_da = NULL;
2738                 check_sa = NULL;
2739         } else switch (rx->sdata->vif.type) {
2740                 case NL80211_IFTYPE_AP:
2741                 case NL80211_IFTYPE_AP_VLAN:
2742                         check_da = NULL;
2743                         break;
2744                 case NL80211_IFTYPE_STATION:
2745                         if (!rx->sta ||
2746                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2747                                 check_sa = NULL;
2748                         break;
2749                 case NL80211_IFTYPE_MESH_POINT:
2750                         check_sa = NULL;
2751                         break;
2752                 default:
2753                         break;
2754         }
2755
2756         skb->dev = dev;
2757         __skb_queue_head_init(&frame_list);
2758
2759         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2760                                           rx->sdata->vif.addr,
2761                                           rx->sdata->vif.type,
2762                                           data_offset, true))
2763                 return RX_DROP_UNUSABLE;
2764
2765         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2766                                  rx->sdata->vif.type,
2767                                  rx->local->hw.extra_tx_headroom,
2768                                  check_da, check_sa);
2769
2770         while (!skb_queue_empty(&frame_list)) {
2771                 rx->skb = __skb_dequeue(&frame_list);
2772
2773                 if (!ieee80211_frame_allowed(rx, fc)) {
2774                         dev_kfree_skb(rx->skb);
2775                         continue;
2776                 }
2777
2778                 ieee80211_deliver_skb(rx);
2779         }
2780
2781         return RX_QUEUED;
2782 }
2783
2784 static ieee80211_rx_result debug_noinline
2785 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2786 {
2787         struct sk_buff *skb = rx->skb;
2788         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2789         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2790         __le16 fc = hdr->frame_control;
2791
2792         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2793                 return RX_CONTINUE;
2794
2795         if (unlikely(!ieee80211_is_data(fc)))
2796                 return RX_CONTINUE;
2797
2798         if (unlikely(!ieee80211_is_data_present(fc)))
2799                 return RX_DROP_MONITOR;
2800
2801         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2802                 switch (rx->sdata->vif.type) {
2803                 case NL80211_IFTYPE_AP_VLAN:
2804                         if (!rx->sdata->u.vlan.sta)
2805                                 return RX_DROP_UNUSABLE;
2806                         break;
2807                 case NL80211_IFTYPE_STATION:
2808                         if (!rx->sdata->u.mgd.use_4addr)
2809                                 return RX_DROP_UNUSABLE;
2810                         break;
2811                 default:
2812                         return RX_DROP_UNUSABLE;
2813                 }
2814         }
2815
2816         if (is_multicast_ether_addr(hdr->addr1))
2817                 return RX_DROP_UNUSABLE;
2818
2819         if (rx->key) {
2820                 /*
2821                  * We should not receive A-MSDUs on pre-HT connections,
2822                  * and HT connections cannot use old ciphers. Thus drop
2823                  * them, as in those cases we couldn't even have SPP
2824                  * A-MSDUs or such.
2825                  */
2826                 switch (rx->key->conf.cipher) {
2827                 case WLAN_CIPHER_SUITE_WEP40:
2828                 case WLAN_CIPHER_SUITE_WEP104:
2829                 case WLAN_CIPHER_SUITE_TKIP:
2830                         return RX_DROP_UNUSABLE;
2831                 default:
2832                         break;
2833                 }
2834         }
2835
2836         return __ieee80211_rx_h_amsdu(rx, 0);
2837 }
2838
2839 #ifdef CONFIG_MAC80211_MESH
2840 static ieee80211_rx_result
2841 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2842 {
2843         struct ieee80211_hdr *fwd_hdr, *hdr;
2844         struct ieee80211_tx_info *info;
2845         struct ieee80211s_hdr *mesh_hdr;
2846         struct sk_buff *skb = rx->skb, *fwd_skb;
2847         struct ieee80211_local *local = rx->local;
2848         struct ieee80211_sub_if_data *sdata = rx->sdata;
2849         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2850         u16 ac, q, hdrlen;
2851         int tailroom = 0;
2852
2853         hdr = (struct ieee80211_hdr *) skb->data;
2854         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2855
2856         /* make sure fixed part of mesh header is there, also checks skb len */
2857         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2858                 return RX_DROP_MONITOR;
2859
2860         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2861
2862         /* make sure full mesh header is there, also checks skb len */
2863         if (!pskb_may_pull(rx->skb,
2864                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2865                 return RX_DROP_MONITOR;
2866
2867         /* reload pointers */
2868         hdr = (struct ieee80211_hdr *) skb->data;
2869         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2870
2871         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2872                 return RX_DROP_MONITOR;
2873
2874         /* frame is in RMC, don't forward */
2875         if (ieee80211_is_data(hdr->frame_control) &&
2876             is_multicast_ether_addr(hdr->addr1) &&
2877             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2878                 return RX_DROP_MONITOR;
2879
2880         if (!ieee80211_is_data(hdr->frame_control))
2881                 return RX_CONTINUE;
2882
2883         if (!mesh_hdr->ttl)
2884                 return RX_DROP_MONITOR;
2885
2886         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2887                 struct mesh_path *mppath;
2888                 char *proxied_addr;
2889                 char *mpp_addr;
2890
2891                 if (is_multicast_ether_addr(hdr->addr1)) {
2892                         mpp_addr = hdr->addr3;
2893                         proxied_addr = mesh_hdr->eaddr1;
2894                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2895                             MESH_FLAGS_AE_A5_A6) {
2896                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2897                         mpp_addr = hdr->addr4;
2898                         proxied_addr = mesh_hdr->eaddr2;
2899                 } else {
2900                         return RX_DROP_MONITOR;
2901                 }
2902
2903                 rcu_read_lock();
2904                 mppath = mpp_path_lookup(sdata, proxied_addr);
2905                 if (!mppath) {
2906                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2907                 } else {
2908                         spin_lock_bh(&mppath->state_lock);
2909                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2910                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2911                         mppath->exp_time = jiffies;
2912                         spin_unlock_bh(&mppath->state_lock);
2913                 }
2914                 rcu_read_unlock();
2915         }
2916
2917         /* Frame has reached destination.  Don't forward */
2918         if (!is_multicast_ether_addr(hdr->addr1) &&
2919             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2920                 return RX_CONTINUE;
2921
2922         ac = ieee802_1d_to_ac[skb->priority];
2923         q = sdata->vif.hw_queue[ac];
2924         if (ieee80211_queue_stopped(&local->hw, q)) {
2925                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2926                 return RX_DROP_MONITOR;
2927         }
2928         skb_set_queue_mapping(skb, ac);
2929
2930         if (!--mesh_hdr->ttl) {
2931                 if (!is_multicast_ether_addr(hdr->addr1))
2932                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2933                                                      dropped_frames_ttl);
2934                 goto out;
2935         }
2936
2937         if (!ifmsh->mshcfg.dot11MeshForwarding)
2938                 goto out;
2939
2940         if (sdata->crypto_tx_tailroom_needed_cnt)
2941                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2942
2943         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2944                                        sdata->encrypt_headroom,
2945                                   tailroom, GFP_ATOMIC);
2946         if (!fwd_skb)
2947                 goto out;
2948
2949         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2950         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2951         info = IEEE80211_SKB_CB(fwd_skb);
2952         memset(info, 0, sizeof(*info));
2953         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2954         info->control.vif = &rx->sdata->vif;
2955         info->control.jiffies = jiffies;
2956         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2957                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2958                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2959                 /* update power mode indication when forwarding */
2960                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2961         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2962                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2963                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2964         } else {
2965                 /* unable to resolve next hop */
2966                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2967                                    fwd_hdr->addr3, 0,
2968                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2969                                    fwd_hdr->addr2);
2970                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2971                 kfree_skb(fwd_skb);
2972                 return RX_DROP_MONITOR;
2973         }
2974
2975         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2976         ieee80211_add_pending_skb(local, fwd_skb);
2977  out:
2978         if (is_multicast_ether_addr(hdr->addr1))
2979                 return RX_CONTINUE;
2980         return RX_DROP_MONITOR;
2981 }
2982 #endif
2983
2984 static ieee80211_rx_result debug_noinline
2985 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2986 {
2987         struct ieee80211_sub_if_data *sdata = rx->sdata;
2988         struct ieee80211_local *local = rx->local;
2989         struct net_device *dev = sdata->dev;
2990         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2991         __le16 fc = hdr->frame_control;
2992         bool port_control;
2993         int err;
2994
2995         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2996                 return RX_CONTINUE;
2997
2998         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2999                 return RX_DROP_MONITOR;
3000
3001         /*
3002          * Send unexpected-4addr-frame event to hostapd. For older versions,
3003          * also drop the frame to cooked monitor interfaces.
3004          */
3005         if (ieee80211_has_a4(hdr->frame_control) &&
3006             sdata->vif.type == NL80211_IFTYPE_AP) {
3007                 if (rx->sta &&
3008                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3009                         cfg80211_rx_unexpected_4addr_frame(
3010                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3011                 return RX_DROP_MONITOR;
3012         }
3013
3014         err = __ieee80211_data_to_8023(rx, &port_control);
3015         if (unlikely(err))
3016                 return RX_DROP_UNUSABLE;
3017
3018         if (!ieee80211_frame_allowed(rx, fc))
3019                 return RX_DROP_MONITOR;
3020
3021         /* directly handle TDLS channel switch requests/responses */
3022         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3023                                                 cpu_to_be16(ETH_P_TDLS))) {
3024                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3025
3026                 if (pskb_may_pull(rx->skb,
3027                                   offsetof(struct ieee80211_tdls_data, u)) &&
3028                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3029                     tf->category == WLAN_CATEGORY_TDLS &&
3030                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3031                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3032                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3033                         __ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3034                         return RX_QUEUED;
3035                 }
3036         }
3037
3038         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3039             unlikely(port_control) && sdata->bss) {
3040                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3041                                      u.ap);
3042                 dev = sdata->dev;
3043                 rx->sdata = sdata;
3044         }
3045
3046         rx->skb->dev = dev;
3047
3048         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3049             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3050             !is_multicast_ether_addr(
3051                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3052             (!local->scanning &&
3053              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3054                 mod_timer(&local->dynamic_ps_timer, jiffies +
3055                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3056
3057         ieee80211_deliver_skb(rx);
3058
3059         return RX_QUEUED;
3060 }
3061
3062 static ieee80211_rx_result debug_noinline
3063 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3064 {
3065         struct sk_buff *skb = rx->skb;
3066         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3067         struct tid_ampdu_rx *tid_agg_rx;
3068         u16 start_seq_num;
3069         u16 tid;
3070
3071         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3072                 return RX_CONTINUE;
3073
3074         if (ieee80211_is_back_req(bar->frame_control)) {
3075                 struct {
3076                         __le16 control, start_seq_num;
3077                 } __packed bar_data;
3078                 struct ieee80211_event event = {
3079                         .type = BAR_RX_EVENT,
3080                 };
3081
3082                 if (!rx->sta)
3083                         return RX_DROP_MONITOR;
3084
3085                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3086                                   &bar_data, sizeof(bar_data)))
3087                         return RX_DROP_MONITOR;
3088
3089                 tid = le16_to_cpu(bar_data.control) >> 12;
3090
3091                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3092                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3093                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3094                                              WLAN_BACK_RECIPIENT,
3095                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3096
3097                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3098                 if (!tid_agg_rx)
3099                         return RX_DROP_MONITOR;
3100
3101                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3102                 event.u.ba.tid = tid;
3103                 event.u.ba.ssn = start_seq_num;
3104                 event.u.ba.sta = &rx->sta->sta;
3105
3106                 /* reset session timer */
3107                 if (tid_agg_rx->timeout)
3108                         mod_timer(&tid_agg_rx->session_timer,
3109                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3110
3111                 spin_lock(&tid_agg_rx->reorder_lock);
3112                 /* release stored frames up to start of BAR */
3113                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3114                                                  start_seq_num, frames);
3115                 spin_unlock(&tid_agg_rx->reorder_lock);
3116
3117                 drv_event_callback(rx->local, rx->sdata, &event);
3118
3119                 kfree_skb(skb);
3120                 return RX_QUEUED;
3121         }
3122
3123         /*
3124          * After this point, we only want management frames,
3125          * so we can drop all remaining control frames to
3126          * cooked monitor interfaces.
3127          */
3128         return RX_DROP_MONITOR;
3129 }
3130
3131 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3132                                            struct ieee80211_mgmt *mgmt,
3133                                            size_t len)
3134 {
3135         struct ieee80211_local *local = sdata->local;
3136         struct sk_buff *skb;
3137         struct ieee80211_mgmt *resp;
3138
3139         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3140                 /* Not to own unicast address */
3141                 return;
3142         }
3143
3144         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3145             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3146                 /* Not from the current AP or not associated yet. */
3147                 return;
3148         }
3149
3150         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3151                 /* Too short SA Query request frame */
3152                 return;
3153         }
3154
3155         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3156         if (skb == NULL)
3157                 return;
3158
3159         skb_reserve(skb, local->hw.extra_tx_headroom);
3160         resp = skb_put_zero(skb, 24);
3161         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3162         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3163         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3164         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3165                                           IEEE80211_STYPE_ACTION);
3166         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3167         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3168         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3169         memcpy(resp->u.action.u.sa_query.trans_id,
3170                mgmt->u.action.u.sa_query.trans_id,
3171                WLAN_SA_QUERY_TR_ID_LEN);
3172
3173         ieee80211_tx_skb(sdata, skb);
3174 }
3175
3176 static ieee80211_rx_result debug_noinline
3177 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3178 {
3179         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3180         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3181
3182         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3183                 return RX_CONTINUE;
3184
3185         /*
3186          * From here on, look only at management frames.
3187          * Data and control frames are already handled,
3188          * and unknown (reserved) frames are useless.
3189          */
3190         if (rx->skb->len < 24)
3191                 return RX_DROP_MONITOR;
3192
3193         if (!ieee80211_is_mgmt(mgmt->frame_control))
3194                 return RX_DROP_MONITOR;
3195
3196         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3197             ieee80211_is_beacon(mgmt->frame_control) &&
3198             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3199                 int sig = 0;
3200
3201                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3202                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3203                         sig = status->signal;
3204
3205                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3206                                                 rx->skb->data, rx->skb->len,
3207                                                 ieee80211_rx_status_to_khz(status),
3208                                                 sig);
3209                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3210         }
3211
3212         if (ieee80211_drop_unencrypted_mgmt(rx))
3213                 return RX_DROP_UNUSABLE;
3214
3215         return RX_CONTINUE;
3216 }
3217
3218 static bool
3219 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3220 {
3221         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3222         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3223         struct ieee80211_sub_if_data *sdata = rx->sdata;
3224         const struct ieee80211_sta_he_cap *hecap;
3225         struct ieee80211_supported_band *sband;
3226
3227         /* TWT actions are only supported in AP for the moment */
3228         if (sdata->vif.type != NL80211_IFTYPE_AP)
3229                 return false;
3230
3231         if (!rx->local->ops->add_twt_setup)
3232                 return false;
3233
3234         sband = rx->local->hw.wiphy->bands[status->band];
3235         hecap = ieee80211_get_he_iftype_cap(sband,
3236                                             ieee80211_vif_type_p2p(&sdata->vif));
3237         if (!hecap)
3238                 return false;
3239
3240         if (!(hecap->he_cap_elem.mac_cap_info[0] &
3241               IEEE80211_HE_MAC_CAP0_TWT_RES))
3242                 return false;
3243
3244         if (!rx->sta)
3245                 return false;
3246
3247         switch (mgmt->u.action.u.s1g.action_code) {
3248         case WLAN_S1G_TWT_SETUP: {
3249                 struct ieee80211_twt_setup *twt;
3250
3251                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3252                                    1 + /* action code */
3253                                    sizeof(struct ieee80211_twt_setup) +
3254                                    2 /* TWT req_type agrt */)
3255                         break;
3256
3257                 twt = (void *)mgmt->u.action.u.s1g.variable;
3258                 if (twt->element_id != WLAN_EID_S1G_TWT)
3259                         break;
3260
3261                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3262                                    4 + /* action code + token + tlv */
3263                                    twt->length)
3264                         break;
3265
3266                 return true; /* queue the frame */
3267         }
3268         case WLAN_S1G_TWT_TEARDOWN:
3269                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3270                         break;
3271
3272                 return true; /* queue the frame */
3273         default:
3274                 break;
3275         }
3276
3277         return false;
3278 }
3279
3280 static ieee80211_rx_result debug_noinline
3281 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3282 {
3283         struct ieee80211_local *local = rx->local;
3284         struct ieee80211_sub_if_data *sdata = rx->sdata;
3285         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3286         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3287         int len = rx->skb->len;
3288
3289         if (!ieee80211_is_action(mgmt->frame_control))
3290                 return RX_CONTINUE;
3291
3292         /* drop too small frames */
3293         if (len < IEEE80211_MIN_ACTION_SIZE)
3294                 return RX_DROP_UNUSABLE;
3295
3296         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3297             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3298             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3299                 return RX_DROP_UNUSABLE;
3300
3301         switch (mgmt->u.action.category) {
3302         case WLAN_CATEGORY_HT:
3303                 /* reject HT action frames from stations not supporting HT */
3304                 if (!rx->sta->sta.ht_cap.ht_supported)
3305                         goto invalid;
3306
3307                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3308                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3309                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3310                     sdata->vif.type != NL80211_IFTYPE_AP &&
3311                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3312                         break;
3313
3314                 /* verify action & smps_control/chanwidth are present */
3315                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3316                         goto invalid;
3317
3318                 switch (mgmt->u.action.u.ht_smps.action) {
3319                 case WLAN_HT_ACTION_SMPS: {
3320                         struct ieee80211_supported_band *sband;
3321                         enum ieee80211_smps_mode smps_mode;
3322                         struct sta_opmode_info sta_opmode = {};
3323
3324                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3325                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3326                                 goto handled;
3327
3328                         /* convert to HT capability */
3329                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3330                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3331                                 smps_mode = IEEE80211_SMPS_OFF;
3332                                 break;
3333                         case WLAN_HT_SMPS_CONTROL_STATIC:
3334                                 smps_mode = IEEE80211_SMPS_STATIC;
3335                                 break;
3336                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3337                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3338                                 break;
3339                         default:
3340                                 goto invalid;
3341                         }
3342
3343                         /* if no change do nothing */
3344                         if (rx->sta->sta.smps_mode == smps_mode)
3345                                 goto handled;
3346                         rx->sta->sta.smps_mode = smps_mode;
3347                         sta_opmode.smps_mode =
3348                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3349                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3350
3351                         sband = rx->local->hw.wiphy->bands[status->band];
3352
3353                         rate_control_rate_update(local, sband, rx->sta,
3354                                                  IEEE80211_RC_SMPS_CHANGED);
3355                         cfg80211_sta_opmode_change_notify(sdata->dev,
3356                                                           rx->sta->addr,
3357                                                           &sta_opmode,
3358                                                           GFP_ATOMIC);
3359                         goto handled;
3360                 }
3361                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3362                         struct ieee80211_supported_band *sband;
3363                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3364                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3365                         struct sta_opmode_info sta_opmode = {};
3366
3367                         /* If it doesn't support 40 MHz it can't change ... */
3368                         if (!(rx->sta->sta.ht_cap.cap &
3369                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3370                                 goto handled;
3371
3372                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3373                                 max_bw = IEEE80211_STA_RX_BW_20;
3374                         else
3375                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3376
3377                         /* set cur_max_bandwidth and recalc sta bw */
3378                         rx->sta->cur_max_bandwidth = max_bw;
3379                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3380
3381                         if (rx->sta->sta.bandwidth == new_bw)
3382                                 goto handled;
3383
3384                         rx->sta->sta.bandwidth = new_bw;
3385                         sband = rx->local->hw.wiphy->bands[status->band];
3386                         sta_opmode.bw =
3387                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3388                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3389
3390                         rate_control_rate_update(local, sband, rx->sta,
3391                                                  IEEE80211_RC_BW_CHANGED);
3392                         cfg80211_sta_opmode_change_notify(sdata->dev,
3393                                                           rx->sta->addr,
3394                                                           &sta_opmode,
3395                                                           GFP_ATOMIC);
3396                         goto handled;
3397                 }
3398                 default:
3399                         goto invalid;
3400                 }
3401
3402                 break;
3403         case WLAN_CATEGORY_PUBLIC:
3404                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3405                         goto invalid;
3406                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3407                         break;
3408                 if (!rx->sta)
3409                         break;
3410                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3411                         break;
3412                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3413                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3414                         break;
3415                 if (len < offsetof(struct ieee80211_mgmt,
3416                                    u.action.u.ext_chan_switch.variable))
3417                         goto invalid;
3418                 goto queue;
3419         case WLAN_CATEGORY_VHT:
3420                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3421                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3422                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3423                     sdata->vif.type != NL80211_IFTYPE_AP &&
3424                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3425                         break;
3426
3427                 /* verify action code is present */
3428                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3429                         goto invalid;
3430
3431                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3432                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3433                         /* verify opmode is present */
3434                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3435                                 goto invalid;
3436                         goto queue;
3437                 }
3438                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3439                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3440                                 goto invalid;
3441                         goto queue;
3442                 }
3443                 default:
3444                         break;
3445                 }
3446                 break;
3447         case WLAN_CATEGORY_BACK:
3448                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3449                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3450                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3451                     sdata->vif.type != NL80211_IFTYPE_AP &&
3452                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3453                         break;
3454
3455                 /* verify action_code is present */
3456                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3457                         break;
3458
3459                 switch (mgmt->u.action.u.addba_req.action_code) {
3460                 case WLAN_ACTION_ADDBA_REQ:
3461                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3462                                    sizeof(mgmt->u.action.u.addba_req)))
3463                                 goto invalid;
3464                         break;
3465                 case WLAN_ACTION_ADDBA_RESP:
3466                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3467                                    sizeof(mgmt->u.action.u.addba_resp)))
3468                                 goto invalid;
3469                         break;
3470                 case WLAN_ACTION_DELBA:
3471                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3472                                    sizeof(mgmt->u.action.u.delba)))
3473                                 goto invalid;
3474                         break;
3475                 default:
3476                         goto invalid;
3477                 }
3478
3479                 goto queue;
3480         case WLAN_CATEGORY_SPECTRUM_MGMT:
3481                 /* verify action_code is present */
3482                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3483                         break;
3484
3485                 switch (mgmt->u.action.u.measurement.action_code) {
3486                 case WLAN_ACTION_SPCT_MSR_REQ:
3487                         if (status->band != NL80211_BAND_5GHZ)
3488                                 break;
3489
3490                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3491                                    sizeof(mgmt->u.action.u.measurement)))
3492                                 break;
3493
3494                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3495                                 break;
3496
3497                         ieee80211_process_measurement_req(sdata, mgmt, len);
3498                         goto handled;
3499                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3500                         u8 *bssid;
3501                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3502                                    sizeof(mgmt->u.action.u.chan_switch)))
3503                                 break;
3504
3505                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3506                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3507                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3508                                 break;
3509
3510                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3511                                 bssid = sdata->u.mgd.bssid;
3512                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3513                                 bssid = sdata->u.ibss.bssid;
3514                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3515                                 bssid = mgmt->sa;
3516                         else
3517                                 break;
3518
3519                         if (!ether_addr_equal(mgmt->bssid, bssid))
3520                                 break;
3521
3522                         goto queue;
3523                         }
3524                 }
3525                 break;
3526         case WLAN_CATEGORY_SELF_PROTECTED:
3527                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3528                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3529                         break;
3530
3531                 switch (mgmt->u.action.u.self_prot.action_code) {
3532                 case WLAN_SP_MESH_PEERING_OPEN:
3533                 case WLAN_SP_MESH_PEERING_CLOSE:
3534                 case WLAN_SP_MESH_PEERING_CONFIRM:
3535                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3536                                 goto invalid;
3537                         if (sdata->u.mesh.user_mpm)
3538                                 /* userspace handles this frame */
3539                                 break;
3540                         goto queue;
3541                 case WLAN_SP_MGK_INFORM:
3542                 case WLAN_SP_MGK_ACK:
3543                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3544                                 goto invalid;
3545                         break;
3546                 }
3547                 break;
3548         case WLAN_CATEGORY_MESH_ACTION:
3549                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3550                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3551                         break;
3552
3553                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3554                         break;
3555                 if (mesh_action_is_path_sel(mgmt) &&
3556                     !mesh_path_sel_is_hwmp(sdata))
3557                         break;
3558                 goto queue;
3559         case WLAN_CATEGORY_S1G:
3560                 if (len < offsetofend(typeof(*mgmt),
3561                                       u.action.u.s1g.action_code))
3562                         break;
3563
3564                 switch (mgmt->u.action.u.s1g.action_code) {
3565                 case WLAN_S1G_TWT_SETUP:
3566                 case WLAN_S1G_TWT_TEARDOWN:
3567                         if (ieee80211_process_rx_twt_action(rx))
3568                                 goto queue;
3569                         break;
3570                 default:
3571                         break;
3572                 }
3573                 break;
3574         }
3575
3576         return RX_CONTINUE;
3577
3578  invalid:
3579         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3580         /* will return in the next handlers */
3581         return RX_CONTINUE;
3582
3583  handled:
3584         if (rx->sta)
3585                 rx->sta->rx_stats.packets++;
3586         dev_kfree_skb(rx->skb);
3587         return RX_QUEUED;
3588
3589  queue:
3590         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3591         return RX_QUEUED;
3592 }
3593
3594 static ieee80211_rx_result debug_noinline
3595 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3596 {
3597         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3598         int sig = 0;
3599
3600         /* skip known-bad action frames and return them in the next handler */
3601         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3602                 return RX_CONTINUE;
3603
3604         /*
3605          * Getting here means the kernel doesn't know how to handle
3606          * it, but maybe userspace does ... include returned frames
3607          * so userspace can register for those to know whether ones
3608          * it transmitted were processed or returned.
3609          */
3610
3611         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3612             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3613                 sig = status->signal;
3614
3615         if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3616                                  ieee80211_rx_status_to_khz(status), sig,
3617                                  rx->skb->data, rx->skb->len, 0)) {
3618                 if (rx->sta)
3619                         rx->sta->rx_stats.packets++;
3620                 dev_kfree_skb(rx->skb);
3621                 return RX_QUEUED;
3622         }
3623
3624         return RX_CONTINUE;
3625 }
3626
3627 static ieee80211_rx_result debug_noinline
3628 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3629 {
3630         struct ieee80211_sub_if_data *sdata = rx->sdata;
3631         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3632         int len = rx->skb->len;
3633
3634         if (!ieee80211_is_action(mgmt->frame_control))
3635                 return RX_CONTINUE;
3636
3637         switch (mgmt->u.action.category) {
3638         case WLAN_CATEGORY_SA_QUERY:
3639                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3640                            sizeof(mgmt->u.action.u.sa_query)))
3641                         break;
3642
3643                 switch (mgmt->u.action.u.sa_query.action) {
3644                 case WLAN_ACTION_SA_QUERY_REQUEST:
3645                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3646                                 break;
3647                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3648                         goto handled;
3649                 }
3650                 break;
3651         }
3652
3653         return RX_CONTINUE;
3654
3655  handled:
3656         if (rx->sta)
3657                 rx->sta->rx_stats.packets++;
3658         dev_kfree_skb(rx->skb);
3659         return RX_QUEUED;
3660 }
3661
3662 static ieee80211_rx_result debug_noinline
3663 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3664 {
3665         struct ieee80211_local *local = rx->local;
3666         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3667         struct sk_buff *nskb;
3668         struct ieee80211_sub_if_data *sdata = rx->sdata;
3669         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3670
3671         if (!ieee80211_is_action(mgmt->frame_control))
3672                 return RX_CONTINUE;
3673
3674         /*
3675          * For AP mode, hostapd is responsible for handling any action
3676          * frames that we didn't handle, including returning unknown
3677          * ones. For all other modes we will return them to the sender,
3678          * setting the 0x80 bit in the action category, as required by
3679          * 802.11-2012 9.24.4.
3680          * Newer versions of hostapd shall also use the management frame
3681          * registration mechanisms, but older ones still use cooked
3682          * monitor interfaces so push all frames there.
3683          */
3684         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3685             (sdata->vif.type == NL80211_IFTYPE_AP ||
3686              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3687                 return RX_DROP_MONITOR;
3688
3689         if (is_multicast_ether_addr(mgmt->da))
3690                 return RX_DROP_MONITOR;
3691
3692         /* do not return rejected action frames */
3693         if (mgmt->u.action.category & 0x80)
3694                 return RX_DROP_UNUSABLE;
3695
3696         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3697                                GFP_ATOMIC);
3698         if (nskb) {
3699                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3700
3701                 nmgmt->u.action.category |= 0x80;
3702                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3703                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3704
3705                 memset(nskb->cb, 0, sizeof(nskb->cb));
3706
3707                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3708                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3709
3710                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3711                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3712                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3713                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3714                                 info->hw_queue =
3715                                         local->hw.offchannel_tx_hw_queue;
3716                 }
3717
3718                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3719                                             status->band);
3720         }
3721         dev_kfree_skb(rx->skb);
3722         return RX_QUEUED;
3723 }
3724
3725 static ieee80211_rx_result debug_noinline
3726 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3727 {
3728         struct ieee80211_sub_if_data *sdata = rx->sdata;
3729         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3730
3731         if (!ieee80211_is_ext(hdr->frame_control))
3732                 return RX_CONTINUE;
3733
3734         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3735                 return RX_DROP_MONITOR;
3736
3737         /* for now only beacons are ext, so queue them */
3738         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3739
3740         return RX_QUEUED;
3741 }
3742
3743 static ieee80211_rx_result debug_noinline
3744 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3745 {
3746         struct ieee80211_sub_if_data *sdata = rx->sdata;
3747         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3748         __le16 stype;
3749
3750         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3751
3752         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3753             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3754             sdata->vif.type != NL80211_IFTYPE_OCB &&
3755             sdata->vif.type != NL80211_IFTYPE_STATION)
3756                 return RX_DROP_MONITOR;
3757
3758         switch (stype) {
3759         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3760         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3761         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3762                 /* process for all: mesh, mlme, ibss */
3763                 break;
3764         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3765                 if (is_multicast_ether_addr(mgmt->da) &&
3766                     !is_broadcast_ether_addr(mgmt->da))
3767                         return RX_DROP_MONITOR;
3768
3769                 /* process only for station/IBSS */
3770                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3771                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3772                         return RX_DROP_MONITOR;
3773                 break;
3774         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3775         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3776         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3777                 if (is_multicast_ether_addr(mgmt->da) &&
3778                     !is_broadcast_ether_addr(mgmt->da))
3779                         return RX_DROP_MONITOR;
3780
3781                 /* process only for station */
3782                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3783                         return RX_DROP_MONITOR;
3784                 break;
3785         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3786                 /* process only for ibss and mesh */
3787                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3788                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3789                         return RX_DROP_MONITOR;
3790                 break;
3791         default:
3792                 return RX_DROP_MONITOR;
3793         }
3794
3795         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3796
3797         return RX_QUEUED;
3798 }
3799
3800 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3801                                         struct ieee80211_rate *rate)
3802 {
3803         struct ieee80211_sub_if_data *sdata;
3804         struct ieee80211_local *local = rx->local;
3805         struct sk_buff *skb = rx->skb, *skb2;
3806         struct net_device *prev_dev = NULL;
3807         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3808         int needed_headroom;
3809
3810         /*
3811          * If cooked monitor has been processed already, then
3812          * don't do it again. If not, set the flag.
3813          */
3814         if (rx->flags & IEEE80211_RX_CMNTR)
3815                 goto out_free_skb;
3816         rx->flags |= IEEE80211_RX_CMNTR;
3817
3818         /* If there are no cooked monitor interfaces, just free the SKB */
3819         if (!local->cooked_mntrs)
3820                 goto out_free_skb;
3821
3822         /* vendor data is long removed here */
3823         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3824         /* room for the radiotap header based on driver features */
3825         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3826
3827         if (skb_headroom(skb) < needed_headroom &&
3828             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3829                 goto out_free_skb;
3830
3831         /* prepend radiotap information */
3832         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3833                                          false);
3834
3835         skb_reset_mac_header(skb);
3836         skb->ip_summed = CHECKSUM_UNNECESSARY;
3837         skb->pkt_type = PACKET_OTHERHOST;
3838         skb->protocol = htons(ETH_P_802_2);
3839
3840         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3841                 if (!ieee80211_sdata_running(sdata))
3842                         continue;
3843
3844                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3845                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3846                         continue;
3847
3848                 if (prev_dev) {
3849                         skb2 = skb_clone(skb, GFP_ATOMIC);
3850                         if (skb2) {
3851                                 skb2->dev = prev_dev;
3852                                 netif_receive_skb(skb2);
3853                         }
3854                 }
3855
3856                 prev_dev = sdata->dev;
3857                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3858         }
3859
3860         if (prev_dev) {
3861                 skb->dev = prev_dev;
3862                 netif_receive_skb(skb);
3863                 return;
3864         }
3865
3866  out_free_skb:
3867         dev_kfree_skb(skb);
3868 }
3869
3870 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3871                                          ieee80211_rx_result res)
3872 {
3873         switch (res) {
3874         case RX_DROP_MONITOR:
3875                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3876                 if (rx->sta)
3877                         rx->sta->rx_stats.dropped++;
3878                 fallthrough;
3879         case RX_CONTINUE: {
3880                 struct ieee80211_rate *rate = NULL;
3881                 struct ieee80211_supported_band *sband;
3882                 struct ieee80211_rx_status *status;
3883
3884                 status = IEEE80211_SKB_RXCB((rx->skb));
3885
3886                 sband = rx->local->hw.wiphy->bands[status->band];
3887                 if (status->encoding == RX_ENC_LEGACY)
3888                         rate = &sband->bitrates[status->rate_idx];
3889
3890                 ieee80211_rx_cooked_monitor(rx, rate);
3891                 break;
3892                 }
3893         case RX_DROP_UNUSABLE:
3894                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3895                 if (rx->sta)
3896                         rx->sta->rx_stats.dropped++;
3897                 dev_kfree_skb(rx->skb);
3898                 break;
3899         case RX_QUEUED:
3900                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3901                 break;
3902         }
3903 }
3904
3905 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3906                                   struct sk_buff_head *frames)
3907 {
3908         ieee80211_rx_result res = RX_DROP_MONITOR;
3909         struct sk_buff *skb;
3910
3911 #define CALL_RXH(rxh)                   \
3912         do {                            \
3913                 res = rxh(rx);          \
3914                 if (res != RX_CONTINUE) \
3915                         goto rxh_next;  \
3916         } while (0)
3917
3918         /* Lock here to avoid hitting all of the data used in the RX
3919          * path (e.g. key data, station data, ...) concurrently when
3920          * a frame is released from the reorder buffer due to timeout
3921          * from the timer, potentially concurrently with RX from the
3922          * driver.
3923          */
3924         spin_lock_bh(&rx->local->rx_path_lock);
3925
3926         while ((skb = __skb_dequeue(frames))) {
3927                 /*
3928                  * all the other fields are valid across frames
3929                  * that belong to an aMPDU since they are on the
3930                  * same TID from the same station
3931                  */
3932                 rx->skb = skb;
3933
3934                 CALL_RXH(ieee80211_rx_h_check_more_data);
3935                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3936                 CALL_RXH(ieee80211_rx_h_sta_process);
3937                 CALL_RXH(ieee80211_rx_h_decrypt);
3938                 CALL_RXH(ieee80211_rx_h_defragment);
3939                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3940                 /* must be after MMIC verify so header is counted in MPDU mic */
3941 #ifdef CONFIG_MAC80211_MESH
3942                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3943                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3944 #endif
3945                 CALL_RXH(ieee80211_rx_h_amsdu);
3946                 CALL_RXH(ieee80211_rx_h_data);
3947
3948                 /* special treatment -- needs the queue */
3949                 res = ieee80211_rx_h_ctrl(rx, frames);
3950                 if (res != RX_CONTINUE)
3951                         goto rxh_next;
3952
3953                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3954                 CALL_RXH(ieee80211_rx_h_action);
3955                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3956                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3957                 CALL_RXH(ieee80211_rx_h_action_return);
3958                 CALL_RXH(ieee80211_rx_h_ext);
3959                 CALL_RXH(ieee80211_rx_h_mgmt);
3960
3961  rxh_next:
3962                 ieee80211_rx_handlers_result(rx, res);
3963
3964 #undef CALL_RXH
3965         }
3966
3967         spin_unlock_bh(&rx->local->rx_path_lock);
3968 }
3969
3970 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3971 {
3972         struct sk_buff_head reorder_release;
3973         ieee80211_rx_result res = RX_DROP_MONITOR;
3974
3975         __skb_queue_head_init(&reorder_release);
3976
3977 #define CALL_RXH(rxh)                   \
3978         do {                            \
3979                 res = rxh(rx);          \
3980                 if (res != RX_CONTINUE) \
3981                         goto rxh_next;  \
3982         } while (0)
3983
3984         CALL_RXH(ieee80211_rx_h_check_dup);
3985         CALL_RXH(ieee80211_rx_h_check);
3986
3987         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3988
3989         ieee80211_rx_handlers(rx, &reorder_release);
3990         return;
3991
3992  rxh_next:
3993         ieee80211_rx_handlers_result(rx, res);
3994
3995 #undef CALL_RXH
3996 }
3997
3998 /*
3999  * This function makes calls into the RX path, therefore
4000  * it has to be invoked under RCU read lock.
4001  */
4002 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4003 {
4004         struct sk_buff_head frames;
4005         struct ieee80211_rx_data rx = {
4006                 .sta = sta,
4007                 .sdata = sta->sdata,
4008                 .local = sta->local,
4009                 /* This is OK -- must be QoS data frame */
4010                 .security_idx = tid,
4011                 .seqno_idx = tid,
4012         };
4013         struct tid_ampdu_rx *tid_agg_rx;
4014
4015         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4016         if (!tid_agg_rx)
4017                 return;
4018
4019         __skb_queue_head_init(&frames);
4020
4021         spin_lock(&tid_agg_rx->reorder_lock);
4022         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4023         spin_unlock(&tid_agg_rx->reorder_lock);
4024
4025         if (!skb_queue_empty(&frames)) {
4026                 struct ieee80211_event event = {
4027                         .type = BA_FRAME_TIMEOUT,
4028                         .u.ba.tid = tid,
4029                         .u.ba.sta = &sta->sta,
4030                 };
4031                 drv_event_callback(rx.local, rx.sdata, &event);
4032         }
4033
4034         ieee80211_rx_handlers(&rx, &frames);
4035 }
4036
4037 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4038                                           u16 ssn, u64 filtered,
4039                                           u16 received_mpdus)
4040 {
4041         struct sta_info *sta;
4042         struct tid_ampdu_rx *tid_agg_rx;
4043         struct sk_buff_head frames;
4044         struct ieee80211_rx_data rx = {
4045                 /* This is OK -- must be QoS data frame */
4046                 .security_idx = tid,
4047                 .seqno_idx = tid,
4048         };
4049         int i, diff;
4050
4051         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4052                 return;
4053
4054         __skb_queue_head_init(&frames);
4055
4056         sta = container_of(pubsta, struct sta_info, sta);
4057
4058         rx.sta = sta;
4059         rx.sdata = sta->sdata;
4060         rx.local = sta->local;
4061
4062         rcu_read_lock();
4063         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4064         if (!tid_agg_rx)
4065                 goto out;
4066
4067         spin_lock_bh(&tid_agg_rx->reorder_lock);
4068
4069         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4070                 int release;
4071
4072                 /* release all frames in the reorder buffer */
4073                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4074                            IEEE80211_SN_MODULO;
4075                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4076                                                  release, &frames);
4077                 /* update ssn to match received ssn */
4078                 tid_agg_rx->head_seq_num = ssn;
4079         } else {
4080                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4081                                                  &frames);
4082         }
4083
4084         /* handle the case that received ssn is behind the mac ssn.
4085          * it can be tid_agg_rx->buf_size behind and still be valid */
4086         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4087         if (diff >= tid_agg_rx->buf_size) {
4088                 tid_agg_rx->reorder_buf_filtered = 0;
4089                 goto release;
4090         }
4091         filtered = filtered >> diff;
4092         ssn += diff;
4093
4094         /* update bitmap */
4095         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4096                 int index = (ssn + i) % tid_agg_rx->buf_size;
4097
4098                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4099                 if (filtered & BIT_ULL(i))
4100                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4101         }
4102
4103         /* now process also frames that the filter marking released */
4104         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4105
4106 release:
4107         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4108
4109         ieee80211_rx_handlers(&rx, &frames);
4110
4111  out:
4112         rcu_read_unlock();
4113 }
4114 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4115
4116 /* main receive path */
4117
4118 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4119 {
4120         struct ieee80211_sub_if_data *sdata = rx->sdata;
4121         struct sk_buff *skb = rx->skb;
4122         struct ieee80211_hdr *hdr = (void *)skb->data;
4123         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4124         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4125         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4126                          ieee80211_is_s1g_beacon(hdr->frame_control);
4127
4128         switch (sdata->vif.type) {
4129         case NL80211_IFTYPE_STATION:
4130                 if (!bssid && !sdata->u.mgd.use_4addr)
4131                         return false;
4132                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4133                         return false;
4134                 if (multicast)
4135                         return true;
4136                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4137         case NL80211_IFTYPE_ADHOC:
4138                 if (!bssid)
4139                         return false;
4140                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4141                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4142                     !is_valid_ether_addr(hdr->addr2))
4143                         return false;
4144                 if (ieee80211_is_beacon(hdr->frame_control))
4145                         return true;
4146                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4147                         return false;
4148                 if (!multicast &&
4149                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4150                         return false;
4151                 if (!rx->sta) {
4152                         int rate_idx;
4153                         if (status->encoding != RX_ENC_LEGACY)
4154                                 rate_idx = 0; /* TODO: HT/VHT rates */
4155                         else
4156                                 rate_idx = status->rate_idx;
4157                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4158                                                  BIT(rate_idx));
4159                 }
4160                 return true;
4161         case NL80211_IFTYPE_OCB:
4162                 if (!bssid)
4163                         return false;
4164                 if (!ieee80211_is_data_present(hdr->frame_control))
4165                         return false;
4166                 if (!is_broadcast_ether_addr(bssid))
4167                         return false;
4168                 if (!multicast &&
4169                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4170                         return false;
4171                 if (!rx->sta) {
4172                         int rate_idx;
4173                         if (status->encoding != RX_ENC_LEGACY)
4174                                 rate_idx = 0; /* TODO: HT rates */
4175                         else
4176                                 rate_idx = status->rate_idx;
4177                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4178                                                 BIT(rate_idx));
4179                 }
4180                 return true;
4181         case NL80211_IFTYPE_MESH_POINT:
4182                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4183                         return false;
4184                 if (multicast)
4185                         return true;
4186                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4187         case NL80211_IFTYPE_AP_VLAN:
4188         case NL80211_IFTYPE_AP:
4189                 if (!bssid)
4190                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4191
4192                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4193                         /*
4194                          * Accept public action frames even when the
4195                          * BSSID doesn't match, this is used for P2P
4196                          * and location updates. Note that mac80211
4197                          * itself never looks at these frames.
4198                          */
4199                         if (!multicast &&
4200                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4201                                 return false;
4202                         if (ieee80211_is_public_action(hdr, skb->len))
4203                                 return true;
4204                         return ieee80211_is_beacon(hdr->frame_control);
4205                 }
4206
4207                 if (!ieee80211_has_tods(hdr->frame_control)) {
4208                         /* ignore data frames to TDLS-peers */
4209                         if (ieee80211_is_data(hdr->frame_control))
4210                                 return false;
4211                         /* ignore action frames to TDLS-peers */
4212                         if (ieee80211_is_action(hdr->frame_control) &&
4213                             !is_broadcast_ether_addr(bssid) &&
4214                             !ether_addr_equal(bssid, hdr->addr1))
4215                                 return false;
4216                 }
4217
4218                 /*
4219                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4220                  * the BSSID - we've checked that already but may have accepted
4221                  * the wildcard (ff:ff:ff:ff:ff:ff).
4222                  *
4223                  * It also says:
4224                  *      The BSSID of the Data frame is determined as follows:
4225                  *      a) If the STA is contained within an AP or is associated
4226                  *         with an AP, the BSSID is the address currently in use
4227                  *         by the STA contained in the AP.
4228                  *
4229                  * So we should not accept data frames with an address that's
4230                  * multicast.
4231                  *
4232                  * Accepting it also opens a security problem because stations
4233                  * could encrypt it with the GTK and inject traffic that way.
4234                  */
4235                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4236                         return false;
4237
4238                 return true;
4239         case NL80211_IFTYPE_P2P_DEVICE:
4240                 return ieee80211_is_public_action(hdr, skb->len) ||
4241                        ieee80211_is_probe_req(hdr->frame_control) ||
4242                        ieee80211_is_probe_resp(hdr->frame_control) ||
4243                        ieee80211_is_beacon(hdr->frame_control);
4244         case NL80211_IFTYPE_NAN:
4245                 /* Currently no frames on NAN interface are allowed */
4246                 return false;
4247         default:
4248                 break;
4249         }
4250
4251         WARN_ON_ONCE(1);
4252         return false;
4253 }
4254
4255 void ieee80211_check_fast_rx(struct sta_info *sta)
4256 {
4257         struct ieee80211_sub_if_data *sdata = sta->sdata;
4258         struct ieee80211_local *local = sdata->local;
4259         struct ieee80211_key *key;
4260         struct ieee80211_fast_rx fastrx = {
4261                 .dev = sdata->dev,
4262                 .vif_type = sdata->vif.type,
4263                 .control_port_protocol = sdata->control_port_protocol,
4264         }, *old, *new = NULL;
4265         bool set_offload = false;
4266         bool assign = false;
4267         bool offload;
4268
4269         /* use sparse to check that we don't return without updating */
4270         __acquire(check_fast_rx);
4271
4272         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4273         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4274         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4275         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4276
4277         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4278
4279         /* fast-rx doesn't do reordering */
4280         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4281             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4282                 goto clear;
4283
4284         switch (sdata->vif.type) {
4285         case NL80211_IFTYPE_STATION:
4286                 if (sta->sta.tdls) {
4287                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4288                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4289                         fastrx.expected_ds_bits = 0;
4290                 } else {
4291                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4292                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4293                         fastrx.expected_ds_bits =
4294                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4295                 }
4296
4297                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4298                         fastrx.expected_ds_bits |=
4299                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4300                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4301                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4302                 }
4303
4304                 if (!sdata->u.mgd.powersave)
4305                         break;
4306
4307                 /* software powersave is a huge mess, avoid all of it */
4308                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4309                         goto clear;
4310                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4311                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4312                         goto clear;
4313                 break;
4314         case NL80211_IFTYPE_AP_VLAN:
4315         case NL80211_IFTYPE_AP:
4316                 /* parallel-rx requires this, at least with calls to
4317                  * ieee80211_sta_ps_transition()
4318                  */
4319                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4320                         goto clear;
4321                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4322                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4323                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4324
4325                 fastrx.internal_forward =
4326                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4327                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4328                          !sdata->u.vlan.sta);
4329
4330                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4331                     sdata->u.vlan.sta) {
4332                         fastrx.expected_ds_bits |=
4333                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4334                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4335                         fastrx.internal_forward = 0;
4336                 }
4337
4338                 break;
4339         default:
4340                 goto clear;
4341         }
4342
4343         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4344                 goto clear;
4345
4346         rcu_read_lock();
4347         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4348         if (!key)
4349                 key = rcu_dereference(sdata->default_unicast_key);
4350         if (key) {
4351                 switch (key->conf.cipher) {
4352                 case WLAN_CIPHER_SUITE_TKIP:
4353                         /* we don't want to deal with MMIC in fast-rx */
4354                         goto clear_rcu;
4355                 case WLAN_CIPHER_SUITE_CCMP:
4356                 case WLAN_CIPHER_SUITE_CCMP_256:
4357                 case WLAN_CIPHER_SUITE_GCMP:
4358                 case WLAN_CIPHER_SUITE_GCMP_256:
4359                         break;
4360                 default:
4361                         /* We also don't want to deal with
4362                          * WEP or cipher scheme.
4363                          */
4364                         goto clear_rcu;
4365                 }
4366
4367                 fastrx.key = true;
4368                 fastrx.icv_len = key->conf.icv_len;
4369         }
4370
4371         assign = true;
4372  clear_rcu:
4373         rcu_read_unlock();
4374  clear:
4375         __release(check_fast_rx);
4376
4377         if (assign)
4378                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4379
4380         offload = assign &&
4381                   (sdata->vif.offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED);
4382
4383         if (offload)
4384                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4385         else
4386                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4387
4388         if (set_offload)
4389                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4390
4391         spin_lock_bh(&sta->lock);
4392         old = rcu_dereference_protected(sta->fast_rx, true);
4393         rcu_assign_pointer(sta->fast_rx, new);
4394         spin_unlock_bh(&sta->lock);
4395
4396         if (old)
4397                 kfree_rcu(old, rcu_head);
4398 }
4399
4400 void ieee80211_clear_fast_rx(struct sta_info *sta)
4401 {
4402         struct ieee80211_fast_rx *old;
4403
4404         spin_lock_bh(&sta->lock);
4405         old = rcu_dereference_protected(sta->fast_rx, true);
4406         RCU_INIT_POINTER(sta->fast_rx, NULL);
4407         spin_unlock_bh(&sta->lock);
4408
4409         if (old)
4410                 kfree_rcu(old, rcu_head);
4411 }
4412
4413 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4414 {
4415         struct ieee80211_local *local = sdata->local;
4416         struct sta_info *sta;
4417
4418         lockdep_assert_held(&local->sta_mtx);
4419
4420         list_for_each_entry(sta, &local->sta_list, list) {
4421                 if (sdata != sta->sdata &&
4422                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4423                         continue;
4424                 ieee80211_check_fast_rx(sta);
4425         }
4426 }
4427
4428 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4429 {
4430         struct ieee80211_local *local = sdata->local;
4431
4432         mutex_lock(&local->sta_mtx);
4433         __ieee80211_check_fast_rx_iface(sdata);
4434         mutex_unlock(&local->sta_mtx);
4435 }
4436
4437 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4438                               struct ieee80211_fast_rx *fast_rx,
4439                               int orig_len)
4440 {
4441         struct ieee80211_sta_rx_stats *stats;
4442         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4443         struct sta_info *sta = rx->sta;
4444         struct sk_buff *skb = rx->skb;
4445         void *sa = skb->data + ETH_ALEN;
4446         void *da = skb->data;
4447
4448         stats = &sta->rx_stats;
4449         if (fast_rx->uses_rss)
4450                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4451
4452         /* statistics part of ieee80211_rx_h_sta_process() */
4453         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4454                 stats->last_signal = status->signal;
4455                 if (!fast_rx->uses_rss)
4456                         ewma_signal_add(&sta->rx_stats_avg.signal,
4457                                         -status->signal);
4458         }
4459
4460         if (status->chains) {
4461                 int i;
4462
4463                 stats->chains = status->chains;
4464                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4465                         int signal = status->chain_signal[i];
4466
4467                         if (!(status->chains & BIT(i)))
4468                                 continue;
4469
4470                         stats->chain_signal_last[i] = signal;
4471                         if (!fast_rx->uses_rss)
4472                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4473                                                 -signal);
4474                 }
4475         }
4476         /* end of statistics */
4477
4478         stats->last_rx = jiffies;
4479         stats->last_rate = sta_stats_encode_rate(status);
4480
4481         stats->fragments++;
4482         stats->packets++;
4483
4484         skb->dev = fast_rx->dev;
4485
4486         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4487
4488         /* The seqno index has the same property as needed
4489          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4490          * for non-QoS-data frames. Here we know it's a data
4491          * frame, so count MSDUs.
4492          */
4493         u64_stats_update_begin(&stats->syncp);
4494         stats->msdu[rx->seqno_idx]++;
4495         stats->bytes += orig_len;
4496         u64_stats_update_end(&stats->syncp);
4497
4498         if (fast_rx->internal_forward) {
4499                 struct sk_buff *xmit_skb = NULL;
4500                 if (is_multicast_ether_addr(da)) {
4501                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4502                 } else if (!ether_addr_equal(da, sa) &&
4503                            sta_info_get(rx->sdata, da)) {
4504                         xmit_skb = skb;
4505                         skb = NULL;
4506                 }
4507
4508                 if (xmit_skb) {
4509                         /*
4510                          * Send to wireless media and increase priority by 256
4511                          * to keep the received priority instead of
4512                          * reclassifying the frame (see cfg80211_classify8021d).
4513                          */
4514                         xmit_skb->priority += 256;
4515                         xmit_skb->protocol = htons(ETH_P_802_3);
4516                         skb_reset_network_header(xmit_skb);
4517                         skb_reset_mac_header(xmit_skb);
4518                         dev_queue_xmit(xmit_skb);
4519                 }
4520
4521                 if (!skb)
4522                         return;
4523         }
4524
4525         /* deliver to local stack */
4526         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4527         ieee80211_deliver_skb_to_local_stack(skb, rx);
4528 }
4529
4530 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4531                                      struct ieee80211_fast_rx *fast_rx)
4532 {
4533         struct sk_buff *skb = rx->skb;
4534         struct ieee80211_hdr *hdr = (void *)skb->data;
4535         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4536         struct sta_info *sta = rx->sta;
4537         int orig_len = skb->len;
4538         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4539         int snap_offs = hdrlen;
4540         struct {
4541                 u8 snap[sizeof(rfc1042_header)];
4542                 __be16 proto;
4543         } *payload __aligned(2);
4544         struct {
4545                 u8 da[ETH_ALEN];
4546                 u8 sa[ETH_ALEN];
4547         } addrs __aligned(2);
4548         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4549
4550         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4551          * to a common data structure; drivers can implement that per queue
4552          * but we don't have that information in mac80211
4553          */
4554         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4555                 return false;
4556
4557 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4558
4559         /* If using encryption, we also need to have:
4560          *  - PN_VALIDATED: similar, but the implementation is tricky
4561          *  - DECRYPTED: necessary for PN_VALIDATED
4562          */
4563         if (fast_rx->key &&
4564             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4565                 return false;
4566
4567         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4568                 return false;
4569
4570         if (unlikely(ieee80211_is_frag(hdr)))
4571                 return false;
4572
4573         /* Since our interface address cannot be multicast, this
4574          * implicitly also rejects multicast frames without the
4575          * explicit check.
4576          *
4577          * We shouldn't get any *data* frames not addressed to us
4578          * (AP mode will accept multicast *management* frames), but
4579          * punting here will make it go through the full checks in
4580          * ieee80211_accept_frame().
4581          */
4582         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4583                 return false;
4584
4585         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4586                                               IEEE80211_FCTL_TODS)) !=
4587             fast_rx->expected_ds_bits)
4588                 return false;
4589
4590         /* assign the key to drop unencrypted frames (later)
4591          * and strip the IV/MIC if necessary
4592          */
4593         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4594                 /* GCMP header length is the same */
4595                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4596         }
4597
4598         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4599                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4600                         goto drop;
4601
4602                 payload = (void *)(skb->data + snap_offs);
4603
4604                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4605                         return false;
4606
4607                 /* Don't handle these here since they require special code.
4608                  * Accept AARP and IPX even though they should come with a
4609                  * bridge-tunnel header - but if we get them this way then
4610                  * there's little point in discarding them.
4611                  */
4612                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4613                              payload->proto == fast_rx->control_port_protocol))
4614                         return false;
4615         }
4616
4617         /* after this point, don't punt to the slowpath! */
4618
4619         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4620             pskb_trim(skb, skb->len - fast_rx->icv_len))
4621                 goto drop;
4622
4623         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4624                 goto drop;
4625
4626         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4627                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4628                     RX_QUEUED)
4629                         goto drop;
4630
4631                 return true;
4632         }
4633
4634         /* do the header conversion - first grab the addresses */
4635         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4636         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4637         /* remove the SNAP but leave the ethertype */
4638         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4639         /* push the addresses in front */
4640         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4641
4642         ieee80211_rx_8023(rx, fast_rx, orig_len);
4643
4644         return true;
4645  drop:
4646         dev_kfree_skb(skb);
4647         if (fast_rx->uses_rss)
4648                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4649
4650         stats->dropped++;
4651         return true;
4652 }
4653
4654 /*
4655  * This function returns whether or not the SKB
4656  * was destined for RX processing or not, which,
4657  * if consume is true, is equivalent to whether
4658  * or not the skb was consumed.
4659  */
4660 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4661                                             struct sk_buff *skb, bool consume)
4662 {
4663         struct ieee80211_local *local = rx->local;
4664         struct ieee80211_sub_if_data *sdata = rx->sdata;
4665
4666         rx->skb = skb;
4667
4668         /* See if we can do fast-rx; if we have to copy we already lost,
4669          * so punt in that case. We should never have to deliver a data
4670          * frame to multiple interfaces anyway.
4671          *
4672          * We skip the ieee80211_accept_frame() call and do the necessary
4673          * checking inside ieee80211_invoke_fast_rx().
4674          */
4675         if (consume && rx->sta) {
4676                 struct ieee80211_fast_rx *fast_rx;
4677
4678                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4679                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4680                         return true;
4681         }
4682
4683         if (!ieee80211_accept_frame(rx))
4684                 return false;
4685
4686         if (!consume) {
4687                 skb = skb_copy(skb, GFP_ATOMIC);
4688                 if (!skb) {
4689                         if (net_ratelimit())
4690                                 wiphy_debug(local->hw.wiphy,
4691                                         "failed to copy skb for %s\n",
4692                                         sdata->name);
4693                         return true;
4694                 }
4695
4696                 rx->skb = skb;
4697         }
4698
4699         ieee80211_invoke_rx_handlers(rx);
4700         return true;
4701 }
4702
4703 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4704                                        struct ieee80211_sta *pubsta,
4705                                        struct sk_buff *skb,
4706                                        struct list_head *list)
4707 {
4708         struct ieee80211_local *local = hw_to_local(hw);
4709         struct ieee80211_fast_rx *fast_rx;
4710         struct ieee80211_rx_data rx;
4711
4712         memset(&rx, 0, sizeof(rx));
4713         rx.skb = skb;
4714         rx.local = local;
4715         rx.list = list;
4716
4717         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4718
4719         /* drop frame if too short for header */
4720         if (skb->len < sizeof(struct ethhdr))
4721                 goto drop;
4722
4723         if (!pubsta)
4724                 goto drop;
4725
4726         rx.sta = container_of(pubsta, struct sta_info, sta);
4727         rx.sdata = rx.sta->sdata;
4728
4729         fast_rx = rcu_dereference(rx.sta->fast_rx);
4730         if (!fast_rx)
4731                 goto drop;
4732
4733         ieee80211_rx_8023(&rx, fast_rx, skb->len);
4734         return;
4735
4736 drop:
4737         dev_kfree_skb(skb);
4738 }
4739
4740 /*
4741  * This is the actual Rx frames handler. as it belongs to Rx path it must
4742  * be called with rcu_read_lock protection.
4743  */
4744 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4745                                          struct ieee80211_sta *pubsta,
4746                                          struct sk_buff *skb,
4747                                          struct list_head *list)
4748 {
4749         struct ieee80211_local *local = hw_to_local(hw);
4750         struct ieee80211_sub_if_data *sdata;
4751         struct ieee80211_hdr *hdr;
4752         __le16 fc;
4753         struct ieee80211_rx_data rx;
4754         struct ieee80211_sub_if_data *prev;
4755         struct rhlist_head *tmp;
4756         int err = 0;
4757
4758         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4759         memset(&rx, 0, sizeof(rx));
4760         rx.skb = skb;
4761         rx.local = local;
4762         rx.list = list;
4763
4764         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4765                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4766
4767         if (ieee80211_is_mgmt(fc)) {
4768                 /* drop frame if too short for header */
4769                 if (skb->len < ieee80211_hdrlen(fc))
4770                         err = -ENOBUFS;
4771                 else
4772                         err = skb_linearize(skb);
4773         } else {
4774                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4775         }
4776
4777         if (err) {
4778                 dev_kfree_skb(skb);
4779                 return;
4780         }
4781
4782         hdr = (struct ieee80211_hdr *)skb->data;
4783         ieee80211_parse_qos(&rx);
4784         ieee80211_verify_alignment(&rx);
4785
4786         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4787                      ieee80211_is_beacon(hdr->frame_control) ||
4788                      ieee80211_is_s1g_beacon(hdr->frame_control)))
4789                 ieee80211_scan_rx(local, skb);
4790
4791         if (ieee80211_is_data(fc)) {
4792                 struct sta_info *sta, *prev_sta;
4793
4794                 if (pubsta) {
4795                         rx.sta = container_of(pubsta, struct sta_info, sta);
4796                         rx.sdata = rx.sta->sdata;
4797                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4798                                 return;
4799                         goto out;
4800                 }
4801
4802                 prev_sta = NULL;
4803
4804                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4805                         if (!prev_sta) {
4806                                 prev_sta = sta;
4807                                 continue;
4808                         }
4809
4810                         rx.sta = prev_sta;
4811                         rx.sdata = prev_sta->sdata;
4812                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4813
4814                         prev_sta = sta;
4815                 }
4816
4817                 if (prev_sta) {
4818                         rx.sta = prev_sta;
4819                         rx.sdata = prev_sta->sdata;
4820
4821                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4822                                 return;
4823                         goto out;
4824                 }
4825         }
4826
4827         prev = NULL;
4828
4829         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4830                 if (!ieee80211_sdata_running(sdata))
4831                         continue;
4832
4833                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4834                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4835                         continue;
4836
4837                 /*
4838                  * frame is destined for this interface, but if it's
4839                  * not also for the previous one we handle that after
4840                  * the loop to avoid copying the SKB once too much
4841                  */
4842
4843                 if (!prev) {
4844                         prev = sdata;
4845                         continue;
4846                 }
4847
4848                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4849                 rx.sdata = prev;
4850                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4851
4852                 prev = sdata;
4853         }
4854
4855         if (prev) {
4856                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4857                 rx.sdata = prev;
4858
4859                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4860                         return;
4861         }
4862
4863  out:
4864         dev_kfree_skb(skb);
4865 }
4866
4867 /*
4868  * This is the receive path handler. It is called by a low level driver when an
4869  * 802.11 MPDU is received from the hardware.
4870  */
4871 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4872                        struct sk_buff *skb, struct list_head *list)
4873 {
4874         struct ieee80211_local *local = hw_to_local(hw);
4875         struct ieee80211_rate *rate = NULL;
4876         struct ieee80211_supported_band *sband;
4877         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4878         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4879
4880         WARN_ON_ONCE(softirq_count() == 0);
4881
4882         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4883                 goto drop;
4884
4885         sband = local->hw.wiphy->bands[status->band];
4886         if (WARN_ON(!sband))
4887                 goto drop;
4888
4889         /*
4890          * If we're suspending, it is possible although not too likely
4891          * that we'd be receiving frames after having already partially
4892          * quiesced the stack. We can't process such frames then since
4893          * that might, for example, cause stations to be added or other
4894          * driver callbacks be invoked.
4895          */
4896         if (unlikely(local->quiescing || local->suspended))
4897                 goto drop;
4898
4899         /* We might be during a HW reconfig, prevent Rx for the same reason */
4900         if (unlikely(local->in_reconfig))
4901                 goto drop;
4902
4903         /*
4904          * The same happens when we're not even started,
4905          * but that's worth a warning.
4906          */
4907         if (WARN_ON(!local->started))
4908                 goto drop;
4909
4910         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4911                 /*
4912                  * Validate the rate, unless a PLCP error means that
4913                  * we probably can't have a valid rate here anyway.
4914                  */
4915
4916                 switch (status->encoding) {
4917                 case RX_ENC_HT:
4918                         /*
4919                          * rate_idx is MCS index, which can be [0-76]
4920                          * as documented on:
4921                          *
4922                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4923                          *
4924                          * Anything else would be some sort of driver or
4925                          * hardware error. The driver should catch hardware
4926                          * errors.
4927                          */
4928                         if (WARN(status->rate_idx > 76,
4929                                  "Rate marked as an HT rate but passed "
4930                                  "status->rate_idx is not "
4931                                  "an MCS index [0-76]: %d (0x%02x)\n",
4932                                  status->rate_idx,
4933                                  status->rate_idx))
4934                                 goto drop;
4935                         break;
4936                 case RX_ENC_VHT:
4937                         if (WARN_ONCE(status->rate_idx > 11 ||
4938                                       !status->nss ||
4939                                       status->nss > 8,
4940                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4941                                       status->rate_idx, status->nss))
4942                                 goto drop;
4943                         break;
4944                 case RX_ENC_HE:
4945                         if (WARN_ONCE(status->rate_idx > 11 ||
4946                                       !status->nss ||
4947                                       status->nss > 8,
4948                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4949                                       status->rate_idx, status->nss))
4950                                 goto drop;
4951                         break;
4952                 default:
4953                         WARN_ON_ONCE(1);
4954                         fallthrough;
4955                 case RX_ENC_LEGACY:
4956                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4957                                 goto drop;
4958                         rate = &sband->bitrates[status->rate_idx];
4959                 }
4960         }
4961
4962         status->rx_flags = 0;
4963
4964         kcov_remote_start_common(skb_get_kcov_handle(skb));
4965
4966         /*
4967          * Frames with failed FCS/PLCP checksum are not returned,
4968          * all other frames are returned without radiotap header
4969          * if it was previously present.
4970          * Also, frames with less than 16 bytes are dropped.
4971          */
4972         if (!(status->flag & RX_FLAG_8023))
4973                 skb = ieee80211_rx_monitor(local, skb, rate);
4974         if (skb) {
4975                 if ((status->flag & RX_FLAG_8023) ||
4976                         ieee80211_is_data_present(hdr->frame_control))
4977                         ieee80211_tpt_led_trig_rx(local, skb->len);
4978
4979                 if (status->flag & RX_FLAG_8023)
4980                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
4981                 else
4982                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
4983         }
4984
4985         kcov_remote_stop();
4986         return;
4987  drop:
4988         kfree_skb(skb);
4989 }
4990 EXPORT_SYMBOL(ieee80211_rx_list);
4991
4992 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4993                        struct sk_buff *skb, struct napi_struct *napi)
4994 {
4995         struct sk_buff *tmp;
4996         LIST_HEAD(list);
4997
4998
4999         /*
5000          * key references and virtual interfaces are protected using RCU
5001          * and this requires that we are in a read-side RCU section during
5002          * receive processing
5003          */
5004         rcu_read_lock();
5005         ieee80211_rx_list(hw, pubsta, skb, &list);
5006         rcu_read_unlock();
5007
5008         if (!napi) {
5009                 netif_receive_skb_list(&list);
5010                 return;
5011         }
5012
5013         list_for_each_entry_safe(skb, tmp, &list, list) {
5014                 skb_list_del_init(skb);
5015                 napi_gro_receive(napi, skb);
5016         }
5017 }
5018 EXPORT_SYMBOL(ieee80211_rx_napi);
5019
5020 /* This is a version of the rx handler that can be called from hard irq
5021  * context. Post the skb on the queue and schedule the tasklet */
5022 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5023 {
5024         struct ieee80211_local *local = hw_to_local(hw);
5025
5026         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5027
5028         skb->pkt_type = IEEE80211_RX_MSG;
5029         skb_queue_tail(&local->skb_queue, skb);
5030         tasklet_schedule(&local->tasklet);
5031 }
5032 EXPORT_SYMBOL(ieee80211_rx_irqsafe);