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                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1987                                                      skb->data,
1988                                                      skb->len);
1989                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1990                 }
1991
1992                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1993                 if (!rx->key)
1994                         return RX_CONTINUE; /* Beacon protection not in use */
1995         } else if (mmie_keyidx >= 0) {
1996                 /* Broadcast/multicast robust management frame / BIP */
1997                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1998                     (status->flag & RX_FLAG_IV_STRIPPED))
1999                         return RX_CONTINUE;
2000
2001                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2002                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2003                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2004                 if (rx->sta) {
2005                         if (ieee80211_is_group_privacy_action(skb) &&
2006                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2007                                 return RX_DROP_MONITOR;
2008
2009                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2010                 }
2011                 if (!rx->key)
2012                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2013         } else if (!ieee80211_has_protected(fc)) {
2014                 /*
2015                  * The frame was not protected, so skip decryption. However, we
2016                  * need to set rx->key if there is a key that could have been
2017                  * used so that the frame may be dropped if encryption would
2018                  * have been expected.
2019                  */
2020                 struct ieee80211_key *key = NULL;
2021                 struct ieee80211_sub_if_data *sdata = rx->sdata;
2022                 int i;
2023
2024                 if (ieee80211_is_beacon(fc)) {
2025                         key = ieee80211_rx_get_bigtk(rx, -1);
2026                 } else if (ieee80211_is_mgmt(fc) &&
2027                            is_multicast_ether_addr(hdr->addr1)) {
2028                         key = rcu_dereference(rx->sdata->default_mgmt_key);
2029                 } else {
2030                         if (rx->sta) {
2031                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2032                                         key = rcu_dereference(rx->sta->gtk[i]);
2033                                         if (key)
2034                                                 break;
2035                                 }
2036                         }
2037                         if (!key) {
2038                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2039                                         key = rcu_dereference(sdata->keys[i]);
2040                                         if (key)
2041                                                 break;
2042                                 }
2043                         }
2044                 }
2045                 if (key)
2046                         rx->key = key;
2047                 return RX_CONTINUE;
2048         } else {
2049                 /*
2050                  * The device doesn't give us the IV so we won't be
2051                  * able to look up the key. That's ok though, we
2052                  * don't need to decrypt the frame, we just won't
2053                  * be able to keep statistics accurate.
2054                  * Except for key threshold notifications, should
2055                  * we somehow allow the driver to tell us which key
2056                  * the hardware used if this flag is set?
2057                  */
2058                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2059                     (status->flag & RX_FLAG_IV_STRIPPED))
2060                         return RX_CONTINUE;
2061
2062                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2063
2064                 if (unlikely(keyidx < 0))
2065                         return RX_DROP_UNUSABLE;
2066
2067                 /* check per-station GTK first, if multicast packet */
2068                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2069                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2070
2071                 /* if not found, try default key */
2072                 if (!rx->key) {
2073                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2074
2075                         /*
2076                          * RSNA-protected unicast frames should always be
2077                          * sent with pairwise or station-to-station keys,
2078                          * but for WEP we allow using a key index as well.
2079                          */
2080                         if (rx->key &&
2081                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2082                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2083                             !is_multicast_ether_addr(hdr->addr1))
2084                                 rx->key = NULL;
2085                 }
2086         }
2087
2088         if (rx->key) {
2089                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2090                         return RX_DROP_MONITOR;
2091
2092                 /* TODO: add threshold stuff again */
2093         } else {
2094                 return RX_DROP_MONITOR;
2095         }
2096
2097         switch (rx->key->conf.cipher) {
2098         case WLAN_CIPHER_SUITE_WEP40:
2099         case WLAN_CIPHER_SUITE_WEP104:
2100                 result = ieee80211_crypto_wep_decrypt(rx);
2101                 break;
2102         case WLAN_CIPHER_SUITE_TKIP:
2103                 result = ieee80211_crypto_tkip_decrypt(rx);
2104                 break;
2105         case WLAN_CIPHER_SUITE_CCMP:
2106                 result = ieee80211_crypto_ccmp_decrypt(
2107                         rx, IEEE80211_CCMP_MIC_LEN);
2108                 break;
2109         case WLAN_CIPHER_SUITE_CCMP_256:
2110                 result = ieee80211_crypto_ccmp_decrypt(
2111                         rx, IEEE80211_CCMP_256_MIC_LEN);
2112                 break;
2113         case WLAN_CIPHER_SUITE_AES_CMAC:
2114                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2115                 break;
2116         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2117                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2118                 break;
2119         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2120         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2121                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2122                 break;
2123         case WLAN_CIPHER_SUITE_GCMP:
2124         case WLAN_CIPHER_SUITE_GCMP_256:
2125                 result = ieee80211_crypto_gcmp_decrypt(rx);
2126                 break;
2127         default:
2128                 result = ieee80211_crypto_hw_decrypt(rx);
2129         }
2130
2131         /* the hdr variable is invalid after the decrypt handlers */
2132
2133         /* either the frame has been decrypted or will be dropped */
2134         status->flag |= RX_FLAG_DECRYPTED;
2135
2136         if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
2137                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2138                                              skb->data, skb->len);
2139
2140         return result;
2141 }
2142
2143 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2144 {
2145         int i;
2146
2147         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2148                 skb_queue_head_init(&cache->entries[i].skb_list);
2149 }
2150
2151 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2152 {
2153         int i;
2154
2155         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2156                 __skb_queue_purge(&cache->entries[i].skb_list);
2157 }
2158
2159 static inline struct ieee80211_fragment_entry *
2160 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2161                          unsigned int frag, unsigned int seq, int rx_queue,
2162                          struct sk_buff **skb)
2163 {
2164         struct ieee80211_fragment_entry *entry;
2165
2166         entry = &cache->entries[cache->next++];
2167         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2168                 cache->next = 0;
2169
2170         __skb_queue_purge(&entry->skb_list);
2171
2172         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2173         *skb = NULL;
2174         entry->first_frag_time = jiffies;
2175         entry->seq = seq;
2176         entry->rx_queue = rx_queue;
2177         entry->last_frag = frag;
2178         entry->check_sequential_pn = false;
2179         entry->extra_len = 0;
2180
2181         return entry;
2182 }
2183
2184 static inline struct ieee80211_fragment_entry *
2185 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2186                           unsigned int frag, unsigned int seq,
2187                           int rx_queue, struct ieee80211_hdr *hdr)
2188 {
2189         struct ieee80211_fragment_entry *entry;
2190         int i, idx;
2191
2192         idx = cache->next;
2193         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2194                 struct ieee80211_hdr *f_hdr;
2195                 struct sk_buff *f_skb;
2196
2197                 idx--;
2198                 if (idx < 0)
2199                         idx = IEEE80211_FRAGMENT_MAX - 1;
2200
2201                 entry = &cache->entries[idx];
2202                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2203                     entry->rx_queue != rx_queue ||
2204                     entry->last_frag + 1 != frag)
2205                         continue;
2206
2207                 f_skb = __skb_peek(&entry->skb_list);
2208                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2209
2210                 /*
2211                  * Check ftype and addresses are equal, else check next fragment
2212                  */
2213                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2214                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2215                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2216                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2217                         continue;
2218
2219                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2220                         __skb_queue_purge(&entry->skb_list);
2221                         continue;
2222                 }
2223                 return entry;
2224         }
2225
2226         return NULL;
2227 }
2228
2229 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2230 {
2231         return rx->key &&
2232                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2233                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2234                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2235                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2236                 ieee80211_has_protected(fc);
2237 }
2238
2239 static ieee80211_rx_result debug_noinline
2240 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2241 {
2242         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2243         struct ieee80211_hdr *hdr;
2244         u16 sc;
2245         __le16 fc;
2246         unsigned int frag, seq;
2247         struct ieee80211_fragment_entry *entry;
2248         struct sk_buff *skb;
2249         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2250
2251         hdr = (struct ieee80211_hdr *)rx->skb->data;
2252         fc = hdr->frame_control;
2253
2254         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2255                 return RX_CONTINUE;
2256
2257         sc = le16_to_cpu(hdr->seq_ctrl);
2258         frag = sc & IEEE80211_SCTL_FRAG;
2259
2260         if (rx->sta)
2261                 cache = &rx->sta->frags;
2262
2263         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2264                 goto out;
2265
2266         if (is_multicast_ether_addr(hdr->addr1))
2267                 return RX_DROP_MONITOR;
2268
2269         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2270
2271         if (skb_linearize(rx->skb))
2272                 return RX_DROP_UNUSABLE;
2273
2274         /*
2275          *  skb_linearize() might change the skb->data and
2276          *  previously cached variables (in this case, hdr) need to
2277          *  be refreshed with the new data.
2278          */
2279         hdr = (struct ieee80211_hdr *)rx->skb->data;
2280         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2281
2282         if (frag == 0) {
2283                 /* This is the first fragment of a new frame. */
2284                 entry = ieee80211_reassemble_add(cache, frag, seq,
2285                                                  rx->seqno_idx, &(rx->skb));
2286                 if (requires_sequential_pn(rx, fc)) {
2287                         int queue = rx->security_idx;
2288
2289                         /* Store CCMP/GCMP PN so that we can verify that the
2290                          * next fragment has a sequential PN value.
2291                          */
2292                         entry->check_sequential_pn = true;
2293                         entry->is_protected = true;
2294                         entry->key_color = rx->key->color;
2295                         memcpy(entry->last_pn,
2296                                rx->key->u.ccmp.rx_pn[queue],
2297                                IEEE80211_CCMP_PN_LEN);
2298                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2299                                               u.ccmp.rx_pn) !=
2300                                      offsetof(struct ieee80211_key,
2301                                               u.gcmp.rx_pn));
2302                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2303                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2304                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2305                                      IEEE80211_GCMP_PN_LEN);
2306                 } else if (rx->key &&
2307                            (ieee80211_has_protected(fc) ||
2308                             (status->flag & RX_FLAG_DECRYPTED))) {
2309                         entry->is_protected = true;
2310                         entry->key_color = rx->key->color;
2311                 }
2312                 return RX_QUEUED;
2313         }
2314
2315         /* This is a fragment for a frame that should already be pending in
2316          * fragment cache. Add this fragment to the end of the pending entry.
2317          */
2318         entry = ieee80211_reassemble_find(cache, frag, seq,
2319                                           rx->seqno_idx, hdr);
2320         if (!entry) {
2321                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2322                 return RX_DROP_MONITOR;
2323         }
2324
2325         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2326          *  MPDU PN values are not incrementing in steps of 1."
2327          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2328          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2329          */
2330         if (entry->check_sequential_pn) {
2331                 int i;
2332                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2333
2334                 if (!requires_sequential_pn(rx, fc))
2335                         return RX_DROP_UNUSABLE;
2336
2337                 /* Prevent mixed key and fragment cache attacks */
2338                 if (entry->key_color != rx->key->color)
2339                         return RX_DROP_UNUSABLE;
2340
2341                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2342                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2343                         pn[i]++;
2344                         if (pn[i])
2345                                 break;
2346                 }
2347
2348                 rpn = rx->ccm_gcm.pn;
2349                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2350                         return RX_DROP_UNUSABLE;
2351                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2352         } else if (entry->is_protected &&
2353                    (!rx->key ||
2354                     (!ieee80211_has_protected(fc) &&
2355                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2356                     rx->key->color != entry->key_color)) {
2357                 /* Drop this as a mixed key or fragment cache attack, even
2358                  * if for TKIP Michael MIC should protect us, and WEP is a
2359                  * lost cause anyway.
2360                  */
2361                 return RX_DROP_UNUSABLE;
2362         } else if (entry->is_protected && rx->key &&
2363                    entry->key_color != rx->key->color &&
2364                    (status->flag & RX_FLAG_DECRYPTED)) {
2365                 return RX_DROP_UNUSABLE;
2366         }
2367
2368         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2369         __skb_queue_tail(&entry->skb_list, rx->skb);
2370         entry->last_frag = frag;
2371         entry->extra_len += rx->skb->len;
2372         if (ieee80211_has_morefrags(fc)) {
2373                 rx->skb = NULL;
2374                 return RX_QUEUED;
2375         }
2376
2377         rx->skb = __skb_dequeue(&entry->skb_list);
2378         if (skb_tailroom(rx->skb) < entry->extra_len) {
2379                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2380                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2381                                               GFP_ATOMIC))) {
2382                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2383                         __skb_queue_purge(&entry->skb_list);
2384                         return RX_DROP_UNUSABLE;
2385                 }
2386         }
2387         while ((skb = __skb_dequeue(&entry->skb_list))) {
2388                 skb_put_data(rx->skb, skb->data, skb->len);
2389                 dev_kfree_skb(skb);
2390         }
2391
2392  out:
2393         ieee80211_led_rx(rx->local);
2394         if (rx->sta)
2395                 rx->sta->rx_stats.packets++;
2396         return RX_CONTINUE;
2397 }
2398
2399 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2400 {
2401         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2402                 return -EACCES;
2403
2404         return 0;
2405 }
2406
2407 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2408 {
2409         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2410         struct sk_buff *skb = rx->skb;
2411         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2412
2413         /*
2414          * Pass through unencrypted frames if the hardware has
2415          * decrypted them already.
2416          */
2417         if (status->flag & RX_FLAG_DECRYPTED)
2418                 return 0;
2419
2420         /* check mesh EAPOL frames first */
2421         if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2422                      ieee80211_is_data(fc))) {
2423                 struct ieee80211s_hdr *mesh_hdr;
2424                 u16 hdr_len = ieee80211_hdrlen(fc);
2425                 u16 ethertype_offset;
2426                 __be16 ethertype;
2427
2428                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2429                         goto drop_check;
2430
2431                 /* make sure fixed part of mesh header is there, also checks skb len */
2432                 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2433                         goto drop_check;
2434
2435                 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2436                 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2437                                    sizeof(rfc1042_header);
2438
2439                 if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
2440                     ethertype == rx->sdata->control_port_protocol)
2441                         return 0;
2442         }
2443
2444 drop_check:
2445         /* Drop unencrypted frames if key is set. */
2446         if (unlikely(!ieee80211_has_protected(fc) &&
2447                      !ieee80211_is_any_nullfunc(fc) &&
2448                      ieee80211_is_data(fc) && rx->key))
2449                 return -EACCES;
2450
2451         return 0;
2452 }
2453
2454 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2455 {
2456         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2457         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2458         __le16 fc = hdr->frame_control;
2459
2460         /*
2461          * Pass through unencrypted frames if the hardware has
2462          * decrypted them already.
2463          */
2464         if (status->flag & RX_FLAG_DECRYPTED)
2465                 return 0;
2466
2467         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2468                 if (unlikely(!ieee80211_has_protected(fc) &&
2469                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2470                              rx->key)) {
2471                         if (ieee80211_is_deauth(fc) ||
2472                             ieee80211_is_disassoc(fc))
2473                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2474                                                              rx->skb->data,
2475                                                              rx->skb->len);
2476                         return -EACCES;
2477                 }
2478                 /* BIP does not use Protected field, so need to check MMIE */
2479                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2480                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2481                         if (ieee80211_is_deauth(fc) ||
2482                             ieee80211_is_disassoc(fc))
2483                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2484                                                              rx->skb->data,
2485                                                              rx->skb->len);
2486                         return -EACCES;
2487                 }
2488                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2489                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2490                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2491                                                      rx->skb->data,
2492                                                      rx->skb->len);
2493                         return -EACCES;
2494                 }
2495                 /*
2496                  * When using MFP, Action frames are not allowed prior to
2497                  * having configured keys.
2498                  */
2499                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2500                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2501                         return -EACCES;
2502         }
2503
2504         return 0;
2505 }
2506
2507 static int
2508 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2509 {
2510         struct ieee80211_sub_if_data *sdata = rx->sdata;
2511         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2512         bool check_port_control = false;
2513         struct ethhdr *ehdr;
2514         int ret;
2515
2516         *port_control = false;
2517         if (ieee80211_has_a4(hdr->frame_control) &&
2518             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2519                 return -1;
2520
2521         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2522             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2523
2524                 if (!sdata->u.mgd.use_4addr)
2525                         return -1;
2526                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2527                         check_port_control = true;
2528         }
2529
2530         if (is_multicast_ether_addr(hdr->addr1) &&
2531             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2532                 return -1;
2533
2534         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2535         if (ret < 0)
2536                 return ret;
2537
2538         ehdr = (struct ethhdr *) rx->skb->data;
2539         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2540                 *port_control = true;
2541         else if (check_port_control)
2542                 return -1;
2543
2544         return 0;
2545 }
2546
2547 /*
2548  * requires that rx->skb is a frame with ethernet header
2549  */
2550 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2551 {
2552         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2553                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2554         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2555
2556         /*
2557          * Allow EAPOL frames to us/the PAE group address regardless of
2558          * whether the frame was encrypted or not, and always disallow
2559          * all other destination addresses for them.
2560          */
2561         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2562                 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2563                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2564
2565         if (ieee80211_802_1x_port_control(rx) ||
2566             ieee80211_drop_unencrypted(rx, fc))
2567                 return false;
2568
2569         return true;
2570 }
2571
2572 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2573                                                  struct ieee80211_rx_data *rx)
2574 {
2575         struct ieee80211_sub_if_data *sdata = rx->sdata;
2576         struct net_device *dev = sdata->dev;
2577
2578         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2579                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2580                       !sdata->control_port_no_preauth)) &&
2581                      sdata->control_port_over_nl80211)) {
2582                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2583                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2584
2585                 cfg80211_rx_control_port(dev, skb, noencrypt);
2586                 dev_kfree_skb(skb);
2587         } else {
2588                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2589
2590                 memset(skb->cb, 0, sizeof(skb->cb));
2591
2592                 /*
2593                  * 802.1X over 802.11 requires that the authenticator address
2594                  * be used for EAPOL frames. However, 802.1X allows the use of
2595                  * the PAE group address instead. If the interface is part of
2596                  * a bridge and we pass the frame with the PAE group address,
2597                  * then the bridge will forward it to the network (even if the
2598                  * client was not associated yet), which isn't supposed to
2599                  * happen.
2600                  * To avoid that, rewrite the destination address to our own
2601                  * address, so that the authenticator (e.g. hostapd) will see
2602                  * the frame, but bridge won't forward it anywhere else. Note
2603                  * that due to earlier filtering, the only other address can
2604                  * be the PAE group address, unless the hardware allowed them
2605                  * through in 802.3 offloaded mode.
2606                  */
2607                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2608                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2609                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2610
2611                 /* deliver to local stack */
2612                 if (rx->list)
2613                         list_add_tail(&skb->list, rx->list);
2614                 else
2615                         netif_receive_skb(skb);
2616         }
2617 }
2618
2619 /*
2620  * requires that rx->skb is a frame with ethernet header
2621  */
2622 static void
2623 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2624 {
2625         struct ieee80211_sub_if_data *sdata = rx->sdata;
2626         struct net_device *dev = sdata->dev;
2627         struct sk_buff *skb, *xmit_skb;
2628         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2629         struct sta_info *dsta;
2630
2631         skb = rx->skb;
2632         xmit_skb = NULL;
2633
2634         dev_sw_netstats_rx_add(dev, skb->len);
2635
2636         if (rx->sta) {
2637                 /* The seqno index has the same property as needed
2638                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2639                  * for non-QoS-data frames. Here we know it's a data
2640                  * frame, so count MSDUs.
2641                  */
2642                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2643                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2644                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2645         }
2646
2647         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2648              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2649             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2650             ehdr->h_proto != rx->sdata->control_port_protocol &&
2651             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2652                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2653                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2654                         /*
2655                          * send multicast frames both to higher layers in
2656                          * local net stack and back to the wireless medium
2657                          */
2658                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2659                         if (!xmit_skb)
2660                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2661                                                     dev->name);
2662                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2663                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2664                         dsta = sta_info_get(sdata, ehdr->h_dest);
2665                         if (dsta) {
2666                                 /*
2667                                  * The destination station is associated to
2668                                  * this AP (in this VLAN), so send the frame
2669                                  * directly to it and do not pass it to local
2670                                  * net stack.
2671                                  */
2672                                 xmit_skb = skb;
2673                                 skb = NULL;
2674                         }
2675                 }
2676         }
2677
2678 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2679         if (skb) {
2680                 /* 'align' will only take the values 0 or 2 here since all
2681                  * frames are required to be aligned to 2-byte boundaries
2682                  * when being passed to mac80211; the code here works just
2683                  * as well if that isn't true, but mac80211 assumes it can
2684                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2685                  */
2686                 int align;
2687
2688                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2689                 if (align) {
2690                         if (WARN_ON(skb_headroom(skb) < 3)) {
2691                                 dev_kfree_skb(skb);
2692                                 skb = NULL;
2693                         } else {
2694                                 u8 *data = skb->data;
2695                                 size_t len = skb_headlen(skb);
2696                                 skb->data -= align;
2697                                 memmove(skb->data, data, len);
2698                                 skb_set_tail_pointer(skb, len);
2699                         }
2700                 }
2701         }
2702 #endif
2703
2704         if (skb) {
2705                 skb->protocol = eth_type_trans(skb, dev);
2706                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2707         }
2708
2709         if (xmit_skb) {
2710                 /*
2711                  * Send to wireless media and increase priority by 256 to
2712                  * keep the received priority instead of reclassifying
2713                  * the frame (see cfg80211_classify8021d).
2714                  */
2715                 xmit_skb->priority += 256;
2716                 xmit_skb->protocol = htons(ETH_P_802_3);
2717                 skb_reset_network_header(xmit_skb);
2718                 skb_reset_mac_header(xmit_skb);
2719                 dev_queue_xmit(xmit_skb);
2720         }
2721 }
2722
2723 static ieee80211_rx_result debug_noinline
2724 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2725 {
2726         struct net_device *dev = rx->sdata->dev;
2727         struct sk_buff *skb = rx->skb;
2728         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2729         __le16 fc = hdr->frame_control;
2730         struct sk_buff_head frame_list;
2731         struct ethhdr ethhdr;
2732         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2733
2734         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2735                 check_da = NULL;
2736                 check_sa = NULL;
2737         } else switch (rx->sdata->vif.type) {
2738                 case NL80211_IFTYPE_AP:
2739                 case NL80211_IFTYPE_AP_VLAN:
2740                         check_da = NULL;
2741                         break;
2742                 case NL80211_IFTYPE_STATION:
2743                         if (!rx->sta ||
2744                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2745                                 check_sa = NULL;
2746                         break;
2747                 case NL80211_IFTYPE_MESH_POINT:
2748                         check_sa = NULL;
2749                         break;
2750                 default:
2751                         break;
2752         }
2753
2754         skb->dev = dev;
2755         __skb_queue_head_init(&frame_list);
2756
2757         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2758                                           rx->sdata->vif.addr,
2759                                           rx->sdata->vif.type,
2760                                           data_offset, true))
2761                 return RX_DROP_UNUSABLE;
2762
2763         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2764                                  rx->sdata->vif.type,
2765                                  rx->local->hw.extra_tx_headroom,
2766                                  check_da, check_sa);
2767
2768         while (!skb_queue_empty(&frame_list)) {
2769                 rx->skb = __skb_dequeue(&frame_list);
2770
2771                 if (!ieee80211_frame_allowed(rx, fc)) {
2772                         dev_kfree_skb(rx->skb);
2773                         continue;
2774                 }
2775
2776                 ieee80211_deliver_skb(rx);
2777         }
2778
2779         return RX_QUEUED;
2780 }
2781
2782 static ieee80211_rx_result debug_noinline
2783 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2784 {
2785         struct sk_buff *skb = rx->skb;
2786         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2787         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2788         __le16 fc = hdr->frame_control;
2789
2790         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2791                 return RX_CONTINUE;
2792
2793         if (unlikely(!ieee80211_is_data(fc)))
2794                 return RX_CONTINUE;
2795
2796         if (unlikely(!ieee80211_is_data_present(fc)))
2797                 return RX_DROP_MONITOR;
2798
2799         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2800                 switch (rx->sdata->vif.type) {
2801                 case NL80211_IFTYPE_AP_VLAN:
2802                         if (!rx->sdata->u.vlan.sta)
2803                                 return RX_DROP_UNUSABLE;
2804                         break;
2805                 case NL80211_IFTYPE_STATION:
2806                         if (!rx->sdata->u.mgd.use_4addr)
2807                                 return RX_DROP_UNUSABLE;
2808                         break;
2809                 default:
2810                         return RX_DROP_UNUSABLE;
2811                 }
2812         }
2813
2814         if (is_multicast_ether_addr(hdr->addr1))
2815                 return RX_DROP_UNUSABLE;
2816
2817         if (rx->key) {
2818                 /*
2819                  * We should not receive A-MSDUs on pre-HT connections,
2820                  * and HT connections cannot use old ciphers. Thus drop
2821                  * them, as in those cases we couldn't even have SPP
2822                  * A-MSDUs or such.
2823                  */
2824                 switch (rx->key->conf.cipher) {
2825                 case WLAN_CIPHER_SUITE_WEP40:
2826                 case WLAN_CIPHER_SUITE_WEP104:
2827                 case WLAN_CIPHER_SUITE_TKIP:
2828                         return RX_DROP_UNUSABLE;
2829                 default:
2830                         break;
2831                 }
2832         }
2833
2834         return __ieee80211_rx_h_amsdu(rx, 0);
2835 }
2836
2837 #ifdef CONFIG_MAC80211_MESH
2838 static ieee80211_rx_result
2839 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2840 {
2841         struct ieee80211_hdr *fwd_hdr, *hdr;
2842         struct ieee80211_tx_info *info;
2843         struct ieee80211s_hdr *mesh_hdr;
2844         struct sk_buff *skb = rx->skb, *fwd_skb;
2845         struct ieee80211_local *local = rx->local;
2846         struct ieee80211_sub_if_data *sdata = rx->sdata;
2847         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2848         u16 ac, q, hdrlen;
2849         int tailroom = 0;
2850
2851         hdr = (struct ieee80211_hdr *) skb->data;
2852         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2853
2854         /* make sure fixed part of mesh header is there, also checks skb len */
2855         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2856                 return RX_DROP_MONITOR;
2857
2858         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2859
2860         /* make sure full mesh header is there, also checks skb len */
2861         if (!pskb_may_pull(rx->skb,
2862                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2863                 return RX_DROP_MONITOR;
2864
2865         /* reload pointers */
2866         hdr = (struct ieee80211_hdr *) skb->data;
2867         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2868
2869         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2870                 return RX_DROP_MONITOR;
2871
2872         /* frame is in RMC, don't forward */
2873         if (ieee80211_is_data(hdr->frame_control) &&
2874             is_multicast_ether_addr(hdr->addr1) &&
2875             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2876                 return RX_DROP_MONITOR;
2877
2878         if (!ieee80211_is_data(hdr->frame_control))
2879                 return RX_CONTINUE;
2880
2881         if (!mesh_hdr->ttl)
2882                 return RX_DROP_MONITOR;
2883
2884         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2885                 struct mesh_path *mppath;
2886                 char *proxied_addr;
2887                 char *mpp_addr;
2888
2889                 if (is_multicast_ether_addr(hdr->addr1)) {
2890                         mpp_addr = hdr->addr3;
2891                         proxied_addr = mesh_hdr->eaddr1;
2892                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2893                             MESH_FLAGS_AE_A5_A6) {
2894                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2895                         mpp_addr = hdr->addr4;
2896                         proxied_addr = mesh_hdr->eaddr2;
2897                 } else {
2898                         return RX_DROP_MONITOR;
2899                 }
2900
2901                 rcu_read_lock();
2902                 mppath = mpp_path_lookup(sdata, proxied_addr);
2903                 if (!mppath) {
2904                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2905                 } else {
2906                         spin_lock_bh(&mppath->state_lock);
2907                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2908                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2909                         mppath->exp_time = jiffies;
2910                         spin_unlock_bh(&mppath->state_lock);
2911                 }
2912                 rcu_read_unlock();
2913         }
2914
2915         /* Frame has reached destination.  Don't forward */
2916         if (!is_multicast_ether_addr(hdr->addr1) &&
2917             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2918                 return RX_CONTINUE;
2919
2920         ac = ieee802_1d_to_ac[skb->priority];
2921         q = sdata->vif.hw_queue[ac];
2922         if (ieee80211_queue_stopped(&local->hw, q)) {
2923                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2924                 return RX_DROP_MONITOR;
2925         }
2926         skb_set_queue_mapping(skb, ac);
2927
2928         if (!--mesh_hdr->ttl) {
2929                 if (!is_multicast_ether_addr(hdr->addr1))
2930                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2931                                                      dropped_frames_ttl);
2932                 goto out;
2933         }
2934
2935         if (!ifmsh->mshcfg.dot11MeshForwarding)
2936                 goto out;
2937
2938         if (sdata->crypto_tx_tailroom_needed_cnt)
2939                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2940
2941         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2942                                        sdata->encrypt_headroom,
2943                                   tailroom, GFP_ATOMIC);
2944         if (!fwd_skb)
2945                 goto out;
2946
2947         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2948         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2949         info = IEEE80211_SKB_CB(fwd_skb);
2950         memset(info, 0, sizeof(*info));
2951         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2952         info->control.vif = &rx->sdata->vif;
2953         info->control.jiffies = jiffies;
2954         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2955                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2956                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2957                 /* update power mode indication when forwarding */
2958                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2959         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2960                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2961                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2962         } else {
2963                 /* unable to resolve next hop */
2964                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2965                                    fwd_hdr->addr3, 0,
2966                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2967                                    fwd_hdr->addr2);
2968                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2969                 kfree_skb(fwd_skb);
2970                 return RX_DROP_MONITOR;
2971         }
2972
2973         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2974         ieee80211_add_pending_skb(local, fwd_skb);
2975  out:
2976         if (is_multicast_ether_addr(hdr->addr1))
2977                 return RX_CONTINUE;
2978         return RX_DROP_MONITOR;
2979 }
2980 #endif
2981
2982 static ieee80211_rx_result debug_noinline
2983 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2984 {
2985         struct ieee80211_sub_if_data *sdata = rx->sdata;
2986         struct ieee80211_local *local = rx->local;
2987         struct net_device *dev = sdata->dev;
2988         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2989         __le16 fc = hdr->frame_control;
2990         bool port_control;
2991         int err;
2992
2993         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2994                 return RX_CONTINUE;
2995
2996         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2997                 return RX_DROP_MONITOR;
2998
2999         /*
3000          * Send unexpected-4addr-frame event to hostapd. For older versions,
3001          * also drop the frame to cooked monitor interfaces.
3002          */
3003         if (ieee80211_has_a4(hdr->frame_control) &&
3004             sdata->vif.type == NL80211_IFTYPE_AP) {
3005                 if (rx->sta &&
3006                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3007                         cfg80211_rx_unexpected_4addr_frame(
3008                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3009                 return RX_DROP_MONITOR;
3010         }
3011
3012         err = __ieee80211_data_to_8023(rx, &port_control);
3013         if (unlikely(err))
3014                 return RX_DROP_UNUSABLE;
3015
3016         if (!ieee80211_frame_allowed(rx, fc))
3017                 return RX_DROP_MONITOR;
3018
3019         /* directly handle TDLS channel switch requests/responses */
3020         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3021                                                 cpu_to_be16(ETH_P_TDLS))) {
3022                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3023
3024                 if (pskb_may_pull(rx->skb,
3025                                   offsetof(struct ieee80211_tdls_data, u)) &&
3026                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3027                     tf->category == WLAN_CATEGORY_TDLS &&
3028                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3029                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3030                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3031                         __ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3032                         return RX_QUEUED;
3033                 }
3034         }
3035
3036         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3037             unlikely(port_control) && sdata->bss) {
3038                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3039                                      u.ap);
3040                 dev = sdata->dev;
3041                 rx->sdata = sdata;
3042         }
3043
3044         rx->skb->dev = dev;
3045
3046         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3047             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3048             !is_multicast_ether_addr(
3049                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3050             (!local->scanning &&
3051              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3052                 mod_timer(&local->dynamic_ps_timer, jiffies +
3053                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3054
3055         ieee80211_deliver_skb(rx);
3056
3057         return RX_QUEUED;
3058 }
3059
3060 static ieee80211_rx_result debug_noinline
3061 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3062 {
3063         struct sk_buff *skb = rx->skb;
3064         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3065         struct tid_ampdu_rx *tid_agg_rx;
3066         u16 start_seq_num;
3067         u16 tid;
3068
3069         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3070                 return RX_CONTINUE;
3071
3072         if (ieee80211_is_back_req(bar->frame_control)) {
3073                 struct {
3074                         __le16 control, start_seq_num;
3075                 } __packed bar_data;
3076                 struct ieee80211_event event = {
3077                         .type = BAR_RX_EVENT,
3078                 };
3079
3080                 if (!rx->sta)
3081                         return RX_DROP_MONITOR;
3082
3083                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3084                                   &bar_data, sizeof(bar_data)))
3085                         return RX_DROP_MONITOR;
3086
3087                 tid = le16_to_cpu(bar_data.control) >> 12;
3088
3089                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3090                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3091                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3092                                              WLAN_BACK_RECIPIENT,
3093                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3094
3095                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3096                 if (!tid_agg_rx)
3097                         return RX_DROP_MONITOR;
3098
3099                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3100                 event.u.ba.tid = tid;
3101                 event.u.ba.ssn = start_seq_num;
3102                 event.u.ba.sta = &rx->sta->sta;
3103
3104                 /* reset session timer */
3105                 if (tid_agg_rx->timeout)
3106                         mod_timer(&tid_agg_rx->session_timer,
3107                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3108
3109                 spin_lock(&tid_agg_rx->reorder_lock);
3110                 /* release stored frames up to start of BAR */
3111                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3112                                                  start_seq_num, frames);
3113                 spin_unlock(&tid_agg_rx->reorder_lock);
3114
3115                 drv_event_callback(rx->local, rx->sdata, &event);
3116
3117                 kfree_skb(skb);
3118                 return RX_QUEUED;
3119         }
3120
3121         /*
3122          * After this point, we only want management frames,
3123          * so we can drop all remaining control frames to
3124          * cooked monitor interfaces.
3125          */
3126         return RX_DROP_MONITOR;
3127 }
3128
3129 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3130                                            struct ieee80211_mgmt *mgmt,
3131                                            size_t len)
3132 {
3133         struct ieee80211_local *local = sdata->local;
3134         struct sk_buff *skb;
3135         struct ieee80211_mgmt *resp;
3136
3137         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3138                 /* Not to own unicast address */
3139                 return;
3140         }
3141
3142         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3143             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3144                 /* Not from the current AP or not associated yet. */
3145                 return;
3146         }
3147
3148         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3149                 /* Too short SA Query request frame */
3150                 return;
3151         }
3152
3153         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3154         if (skb == NULL)
3155                 return;
3156
3157         skb_reserve(skb, local->hw.extra_tx_headroom);
3158         resp = skb_put_zero(skb, 24);
3159         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3160         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3161         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3162         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3163                                           IEEE80211_STYPE_ACTION);
3164         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3165         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3166         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3167         memcpy(resp->u.action.u.sa_query.trans_id,
3168                mgmt->u.action.u.sa_query.trans_id,
3169                WLAN_SA_QUERY_TR_ID_LEN);
3170
3171         ieee80211_tx_skb(sdata, skb);
3172 }
3173
3174 static ieee80211_rx_result debug_noinline
3175 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3176 {
3177         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3178         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3179
3180         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3181                 return RX_CONTINUE;
3182
3183         /*
3184          * From here on, look only at management frames.
3185          * Data and control frames are already handled,
3186          * and unknown (reserved) frames are useless.
3187          */
3188         if (rx->skb->len < 24)
3189                 return RX_DROP_MONITOR;
3190
3191         if (!ieee80211_is_mgmt(mgmt->frame_control))
3192                 return RX_DROP_MONITOR;
3193
3194         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3195             ieee80211_is_beacon(mgmt->frame_control) &&
3196             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3197                 int sig = 0;
3198
3199                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3200                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3201                         sig = status->signal;
3202
3203                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3204                                                 rx->skb->data, rx->skb->len,
3205                                                 ieee80211_rx_status_to_khz(status),
3206                                                 sig);
3207                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3208         }
3209
3210         if (ieee80211_drop_unencrypted_mgmt(rx))
3211                 return RX_DROP_UNUSABLE;
3212
3213         return RX_CONTINUE;
3214 }
3215
3216 static bool
3217 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3218 {
3219         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3220         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3221         struct ieee80211_sub_if_data *sdata = rx->sdata;
3222         const struct ieee80211_sta_he_cap *hecap;
3223         struct ieee80211_supported_band *sband;
3224
3225         /* TWT actions are only supported in AP for the moment */
3226         if (sdata->vif.type != NL80211_IFTYPE_AP)
3227                 return false;
3228
3229         if (!rx->local->ops->add_twt_setup)
3230                 return false;
3231
3232         sband = rx->local->hw.wiphy->bands[status->band];
3233         hecap = ieee80211_get_he_iftype_cap(sband,
3234                                             ieee80211_vif_type_p2p(&sdata->vif));
3235         if (!hecap)
3236                 return false;
3237
3238         if (!(hecap->he_cap_elem.mac_cap_info[0] &
3239               IEEE80211_HE_MAC_CAP0_TWT_RES))
3240                 return false;
3241
3242         if (!rx->sta)
3243                 return false;
3244
3245         switch (mgmt->u.action.u.s1g.action_code) {
3246         case WLAN_S1G_TWT_SETUP: {
3247                 struct ieee80211_twt_setup *twt;
3248
3249                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3250                                    1 + /* action code */
3251                                    sizeof(struct ieee80211_twt_setup) +
3252                                    2 /* TWT req_type agrt */)
3253                         break;
3254
3255                 twt = (void *)mgmt->u.action.u.s1g.variable;
3256                 if (twt->element_id != WLAN_EID_S1G_TWT)
3257                         break;
3258
3259                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3260                                    4 + /* action code + token + tlv */
3261                                    twt->length)
3262                         break;
3263
3264                 return true; /* queue the frame */
3265         }
3266         case WLAN_S1G_TWT_TEARDOWN:
3267                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3268                         break;
3269
3270                 return true; /* queue the frame */
3271         default:
3272                 break;
3273         }
3274
3275         return false;
3276 }
3277
3278 static ieee80211_rx_result debug_noinline
3279 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3280 {
3281         struct ieee80211_local *local = rx->local;
3282         struct ieee80211_sub_if_data *sdata = rx->sdata;
3283         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3284         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3285         int len = rx->skb->len;
3286
3287         if (!ieee80211_is_action(mgmt->frame_control))
3288                 return RX_CONTINUE;
3289
3290         /* drop too small frames */
3291         if (len < IEEE80211_MIN_ACTION_SIZE)
3292                 return RX_DROP_UNUSABLE;
3293
3294         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3295             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3296             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3297                 return RX_DROP_UNUSABLE;
3298
3299         switch (mgmt->u.action.category) {
3300         case WLAN_CATEGORY_HT:
3301                 /* reject HT action frames from stations not supporting HT */
3302                 if (!rx->sta->sta.ht_cap.ht_supported)
3303                         goto invalid;
3304
3305                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3306                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3307                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3308                     sdata->vif.type != NL80211_IFTYPE_AP &&
3309                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3310                         break;
3311
3312                 /* verify action & smps_control/chanwidth are present */
3313                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3314                         goto invalid;
3315
3316                 switch (mgmt->u.action.u.ht_smps.action) {
3317                 case WLAN_HT_ACTION_SMPS: {
3318                         struct ieee80211_supported_band *sband;
3319                         enum ieee80211_smps_mode smps_mode;
3320                         struct sta_opmode_info sta_opmode = {};
3321
3322                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3323                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3324                                 goto handled;
3325
3326                         /* convert to HT capability */
3327                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3328                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3329                                 smps_mode = IEEE80211_SMPS_OFF;
3330                                 break;
3331                         case WLAN_HT_SMPS_CONTROL_STATIC:
3332                                 smps_mode = IEEE80211_SMPS_STATIC;
3333                                 break;
3334                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3335                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3336                                 break;
3337                         default:
3338                                 goto invalid;
3339                         }
3340
3341                         /* if no change do nothing */
3342                         if (rx->sta->sta.smps_mode == smps_mode)
3343                                 goto handled;
3344                         rx->sta->sta.smps_mode = smps_mode;
3345                         sta_opmode.smps_mode =
3346                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3347                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3348
3349                         sband = rx->local->hw.wiphy->bands[status->band];
3350
3351                         rate_control_rate_update(local, sband, rx->sta,
3352                                                  IEEE80211_RC_SMPS_CHANGED);
3353                         cfg80211_sta_opmode_change_notify(sdata->dev,
3354                                                           rx->sta->addr,
3355                                                           &sta_opmode,
3356                                                           GFP_ATOMIC);
3357                         goto handled;
3358                 }
3359                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3360                         struct ieee80211_supported_band *sband;
3361                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3362                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3363                         struct sta_opmode_info sta_opmode = {};
3364
3365                         /* If it doesn't support 40 MHz it can't change ... */
3366                         if (!(rx->sta->sta.ht_cap.cap &
3367                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3368                                 goto handled;
3369
3370                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3371                                 max_bw = IEEE80211_STA_RX_BW_20;
3372                         else
3373                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3374
3375                         /* set cur_max_bandwidth and recalc sta bw */
3376                         rx->sta->cur_max_bandwidth = max_bw;
3377                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3378
3379                         if (rx->sta->sta.bandwidth == new_bw)
3380                                 goto handled;
3381
3382                         rx->sta->sta.bandwidth = new_bw;
3383                         sband = rx->local->hw.wiphy->bands[status->band];
3384                         sta_opmode.bw =
3385                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3386                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3387
3388                         rate_control_rate_update(local, sband, rx->sta,
3389                                                  IEEE80211_RC_BW_CHANGED);
3390                         cfg80211_sta_opmode_change_notify(sdata->dev,
3391                                                           rx->sta->addr,
3392                                                           &sta_opmode,
3393                                                           GFP_ATOMIC);
3394                         goto handled;
3395                 }
3396                 default:
3397                         goto invalid;
3398                 }
3399
3400                 break;
3401         case WLAN_CATEGORY_PUBLIC:
3402                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3403                         goto invalid;
3404                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3405                         break;
3406                 if (!rx->sta)
3407                         break;
3408                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3409                         break;
3410                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3411                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3412                         break;
3413                 if (len < offsetof(struct ieee80211_mgmt,
3414                                    u.action.u.ext_chan_switch.variable))
3415                         goto invalid;
3416                 goto queue;
3417         case WLAN_CATEGORY_VHT:
3418                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3419                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3420                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3421                     sdata->vif.type != NL80211_IFTYPE_AP &&
3422                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3423                         break;
3424
3425                 /* verify action code is present */
3426                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3427                         goto invalid;
3428
3429                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3430                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3431                         /* verify opmode is present */
3432                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3433                                 goto invalid;
3434                         goto queue;
3435                 }
3436                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3437                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3438                                 goto invalid;
3439                         goto queue;
3440                 }
3441                 default:
3442                         break;
3443                 }
3444                 break;
3445         case WLAN_CATEGORY_BACK:
3446                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3447                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3448                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3449                     sdata->vif.type != NL80211_IFTYPE_AP &&
3450                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3451                         break;
3452
3453                 /* verify action_code is present */
3454                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3455                         break;
3456
3457                 switch (mgmt->u.action.u.addba_req.action_code) {
3458                 case WLAN_ACTION_ADDBA_REQ:
3459                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3460                                    sizeof(mgmt->u.action.u.addba_req)))
3461                                 goto invalid;
3462                         break;
3463                 case WLAN_ACTION_ADDBA_RESP:
3464                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3465                                    sizeof(mgmt->u.action.u.addba_resp)))
3466                                 goto invalid;
3467                         break;
3468                 case WLAN_ACTION_DELBA:
3469                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3470                                    sizeof(mgmt->u.action.u.delba)))
3471                                 goto invalid;
3472                         break;
3473                 default:
3474                         goto invalid;
3475                 }
3476
3477                 goto queue;
3478         case WLAN_CATEGORY_SPECTRUM_MGMT:
3479                 /* verify action_code is present */
3480                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3481                         break;
3482
3483                 switch (mgmt->u.action.u.measurement.action_code) {
3484                 case WLAN_ACTION_SPCT_MSR_REQ:
3485                         if (status->band != NL80211_BAND_5GHZ)
3486                                 break;
3487
3488                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3489                                    sizeof(mgmt->u.action.u.measurement)))
3490                                 break;
3491
3492                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3493                                 break;
3494
3495                         ieee80211_process_measurement_req(sdata, mgmt, len);
3496                         goto handled;
3497                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3498                         u8 *bssid;
3499                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3500                                    sizeof(mgmt->u.action.u.chan_switch)))
3501                                 break;
3502
3503                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3504                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3505                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3506                                 break;
3507
3508                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3509                                 bssid = sdata->u.mgd.bssid;
3510                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3511                                 bssid = sdata->u.ibss.bssid;
3512                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3513                                 bssid = mgmt->sa;
3514                         else
3515                                 break;
3516
3517                         if (!ether_addr_equal(mgmt->bssid, bssid))
3518                                 break;
3519
3520                         goto queue;
3521                         }
3522                 }
3523                 break;
3524         case WLAN_CATEGORY_SELF_PROTECTED:
3525                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3526                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3527                         break;
3528
3529                 switch (mgmt->u.action.u.self_prot.action_code) {
3530                 case WLAN_SP_MESH_PEERING_OPEN:
3531                 case WLAN_SP_MESH_PEERING_CLOSE:
3532                 case WLAN_SP_MESH_PEERING_CONFIRM:
3533                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3534                                 goto invalid;
3535                         if (sdata->u.mesh.user_mpm)
3536                                 /* userspace handles this frame */
3537                                 break;
3538                         goto queue;
3539                 case WLAN_SP_MGK_INFORM:
3540                 case WLAN_SP_MGK_ACK:
3541                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3542                                 goto invalid;
3543                         break;
3544                 }
3545                 break;
3546         case WLAN_CATEGORY_MESH_ACTION:
3547                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3548                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3549                         break;
3550
3551                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3552                         break;
3553                 if (mesh_action_is_path_sel(mgmt) &&
3554                     !mesh_path_sel_is_hwmp(sdata))
3555                         break;
3556                 goto queue;
3557         case WLAN_CATEGORY_S1G:
3558                 switch (mgmt->u.action.u.s1g.action_code) {
3559                 case WLAN_S1G_TWT_SETUP:
3560                 case WLAN_S1G_TWT_TEARDOWN:
3561                         if (ieee80211_process_rx_twt_action(rx))
3562                                 goto queue;
3563                         break;
3564                 default:
3565                         break;
3566                 }
3567                 break;
3568         }
3569
3570         return RX_CONTINUE;
3571
3572  invalid:
3573         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3574         /* will return in the next handlers */
3575         return RX_CONTINUE;
3576
3577  handled:
3578         if (rx->sta)
3579                 rx->sta->rx_stats.packets++;
3580         dev_kfree_skb(rx->skb);
3581         return RX_QUEUED;
3582
3583  queue:
3584         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3585         return RX_QUEUED;
3586 }
3587
3588 static ieee80211_rx_result debug_noinline
3589 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3590 {
3591         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3592         int sig = 0;
3593
3594         /* skip known-bad action frames and return them in the next handler */
3595         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3596                 return RX_CONTINUE;
3597
3598         /*
3599          * Getting here means the kernel doesn't know how to handle
3600          * it, but maybe userspace does ... include returned frames
3601          * so userspace can register for those to know whether ones
3602          * it transmitted were processed or returned.
3603          */
3604
3605         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3606             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3607                 sig = status->signal;
3608
3609         if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3610                                  ieee80211_rx_status_to_khz(status), sig,
3611                                  rx->skb->data, rx->skb->len, 0)) {
3612                 if (rx->sta)
3613                         rx->sta->rx_stats.packets++;
3614                 dev_kfree_skb(rx->skb);
3615                 return RX_QUEUED;
3616         }
3617
3618         return RX_CONTINUE;
3619 }
3620
3621 static ieee80211_rx_result debug_noinline
3622 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3623 {
3624         struct ieee80211_sub_if_data *sdata = rx->sdata;
3625         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3626         int len = rx->skb->len;
3627
3628         if (!ieee80211_is_action(mgmt->frame_control))
3629                 return RX_CONTINUE;
3630
3631         switch (mgmt->u.action.category) {
3632         case WLAN_CATEGORY_SA_QUERY:
3633                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3634                            sizeof(mgmt->u.action.u.sa_query)))
3635                         break;
3636
3637                 switch (mgmt->u.action.u.sa_query.action) {
3638                 case WLAN_ACTION_SA_QUERY_REQUEST:
3639                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3640                                 break;
3641                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3642                         goto handled;
3643                 }
3644                 break;
3645         }
3646
3647         return RX_CONTINUE;
3648
3649  handled:
3650         if (rx->sta)
3651                 rx->sta->rx_stats.packets++;
3652         dev_kfree_skb(rx->skb);
3653         return RX_QUEUED;
3654 }
3655
3656 static ieee80211_rx_result debug_noinline
3657 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3658 {
3659         struct ieee80211_local *local = rx->local;
3660         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3661         struct sk_buff *nskb;
3662         struct ieee80211_sub_if_data *sdata = rx->sdata;
3663         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3664
3665         if (!ieee80211_is_action(mgmt->frame_control))
3666                 return RX_CONTINUE;
3667
3668         /*
3669          * For AP mode, hostapd is responsible for handling any action
3670          * frames that we didn't handle, including returning unknown
3671          * ones. For all other modes we will return them to the sender,
3672          * setting the 0x80 bit in the action category, as required by
3673          * 802.11-2012 9.24.4.
3674          * Newer versions of hostapd shall also use the management frame
3675          * registration mechanisms, but older ones still use cooked
3676          * monitor interfaces so push all frames there.
3677          */
3678         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3679             (sdata->vif.type == NL80211_IFTYPE_AP ||
3680              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3681                 return RX_DROP_MONITOR;
3682
3683         if (is_multicast_ether_addr(mgmt->da))
3684                 return RX_DROP_MONITOR;
3685
3686         /* do not return rejected action frames */
3687         if (mgmt->u.action.category & 0x80)
3688                 return RX_DROP_UNUSABLE;
3689
3690         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3691                                GFP_ATOMIC);
3692         if (nskb) {
3693                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3694
3695                 nmgmt->u.action.category |= 0x80;
3696                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3697                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3698
3699                 memset(nskb->cb, 0, sizeof(nskb->cb));
3700
3701                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3702                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3703
3704                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3705                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3706                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3707                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3708                                 info->hw_queue =
3709                                         local->hw.offchannel_tx_hw_queue;
3710                 }
3711
3712                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3713                                             status->band);
3714         }
3715         dev_kfree_skb(rx->skb);
3716         return RX_QUEUED;
3717 }
3718
3719 static ieee80211_rx_result debug_noinline
3720 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3721 {
3722         struct ieee80211_sub_if_data *sdata = rx->sdata;
3723         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3724
3725         if (!ieee80211_is_ext(hdr->frame_control))
3726                 return RX_CONTINUE;
3727
3728         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3729                 return RX_DROP_MONITOR;
3730
3731         /* for now only beacons are ext, so queue them */
3732         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3733
3734         return RX_QUEUED;
3735 }
3736
3737 static ieee80211_rx_result debug_noinline
3738 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3739 {
3740         struct ieee80211_sub_if_data *sdata = rx->sdata;
3741         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3742         __le16 stype;
3743
3744         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3745
3746         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3747             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3748             sdata->vif.type != NL80211_IFTYPE_OCB &&
3749             sdata->vif.type != NL80211_IFTYPE_STATION)
3750                 return RX_DROP_MONITOR;
3751
3752         switch (stype) {
3753         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3754         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3755         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3756                 /* process for all: mesh, mlme, ibss */
3757                 break;
3758         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3759                 if (is_multicast_ether_addr(mgmt->da) &&
3760                     !is_broadcast_ether_addr(mgmt->da))
3761                         return RX_DROP_MONITOR;
3762
3763                 /* process only for station/IBSS */
3764                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3765                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3766                         return RX_DROP_MONITOR;
3767                 break;
3768         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3769         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3770         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3771                 if (is_multicast_ether_addr(mgmt->da) &&
3772                     !is_broadcast_ether_addr(mgmt->da))
3773                         return RX_DROP_MONITOR;
3774
3775                 /* process only for station */
3776                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3777                         return RX_DROP_MONITOR;
3778                 break;
3779         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3780                 /* process only for ibss and mesh */
3781                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3782                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3783                         return RX_DROP_MONITOR;
3784                 break;
3785         default:
3786                 return RX_DROP_MONITOR;
3787         }
3788
3789         ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3790
3791         return RX_QUEUED;
3792 }
3793
3794 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3795                                         struct ieee80211_rate *rate)
3796 {
3797         struct ieee80211_sub_if_data *sdata;
3798         struct ieee80211_local *local = rx->local;
3799         struct sk_buff *skb = rx->skb, *skb2;
3800         struct net_device *prev_dev = NULL;
3801         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3802         int needed_headroom;
3803
3804         /*
3805          * If cooked monitor has been processed already, then
3806          * don't do it again. If not, set the flag.
3807          */
3808         if (rx->flags & IEEE80211_RX_CMNTR)
3809                 goto out_free_skb;
3810         rx->flags |= IEEE80211_RX_CMNTR;
3811
3812         /* If there are no cooked monitor interfaces, just free the SKB */
3813         if (!local->cooked_mntrs)
3814                 goto out_free_skb;
3815
3816         /* vendor data is long removed here */
3817         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3818         /* room for the radiotap header based on driver features */
3819         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3820
3821         if (skb_headroom(skb) < needed_headroom &&
3822             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3823                 goto out_free_skb;
3824
3825         /* prepend radiotap information */
3826         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3827                                          false);
3828
3829         skb_reset_mac_header(skb);
3830         skb->ip_summed = CHECKSUM_UNNECESSARY;
3831         skb->pkt_type = PACKET_OTHERHOST;
3832         skb->protocol = htons(ETH_P_802_2);
3833
3834         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3835                 if (!ieee80211_sdata_running(sdata))
3836                         continue;
3837
3838                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3839                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3840                         continue;
3841
3842                 if (prev_dev) {
3843                         skb2 = skb_clone(skb, GFP_ATOMIC);
3844                         if (skb2) {
3845                                 skb2->dev = prev_dev;
3846                                 netif_receive_skb(skb2);
3847                         }
3848                 }
3849
3850                 prev_dev = sdata->dev;
3851                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3852         }
3853
3854         if (prev_dev) {
3855                 skb->dev = prev_dev;
3856                 netif_receive_skb(skb);
3857                 return;
3858         }
3859
3860  out_free_skb:
3861         dev_kfree_skb(skb);
3862 }
3863
3864 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3865                                          ieee80211_rx_result res)
3866 {
3867         switch (res) {
3868         case RX_DROP_MONITOR:
3869                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3870                 if (rx->sta)
3871                         rx->sta->rx_stats.dropped++;
3872                 fallthrough;
3873         case RX_CONTINUE: {
3874                 struct ieee80211_rate *rate = NULL;
3875                 struct ieee80211_supported_band *sband;
3876                 struct ieee80211_rx_status *status;
3877
3878                 status = IEEE80211_SKB_RXCB((rx->skb));
3879
3880                 sband = rx->local->hw.wiphy->bands[status->band];
3881                 if (status->encoding == RX_ENC_LEGACY)
3882                         rate = &sband->bitrates[status->rate_idx];
3883
3884                 ieee80211_rx_cooked_monitor(rx, rate);
3885                 break;
3886                 }
3887         case RX_DROP_UNUSABLE:
3888                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3889                 if (rx->sta)
3890                         rx->sta->rx_stats.dropped++;
3891                 dev_kfree_skb(rx->skb);
3892                 break;
3893         case RX_QUEUED:
3894                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3895                 break;
3896         }
3897 }
3898
3899 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3900                                   struct sk_buff_head *frames)
3901 {
3902         ieee80211_rx_result res = RX_DROP_MONITOR;
3903         struct sk_buff *skb;
3904
3905 #define CALL_RXH(rxh)                   \
3906         do {                            \
3907                 res = rxh(rx);          \
3908                 if (res != RX_CONTINUE) \
3909                         goto rxh_next;  \
3910         } while (0)
3911
3912         /* Lock here to avoid hitting all of the data used in the RX
3913          * path (e.g. key data, station data, ...) concurrently when
3914          * a frame is released from the reorder buffer due to timeout
3915          * from the timer, potentially concurrently with RX from the
3916          * driver.
3917          */
3918         spin_lock_bh(&rx->local->rx_path_lock);
3919
3920         while ((skb = __skb_dequeue(frames))) {
3921                 /*
3922                  * all the other fields are valid across frames
3923                  * that belong to an aMPDU since they are on the
3924                  * same TID from the same station
3925                  */
3926                 rx->skb = skb;
3927
3928                 CALL_RXH(ieee80211_rx_h_check_more_data);
3929                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3930                 CALL_RXH(ieee80211_rx_h_sta_process);
3931                 CALL_RXH(ieee80211_rx_h_decrypt);
3932                 CALL_RXH(ieee80211_rx_h_defragment);
3933                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3934                 /* must be after MMIC verify so header is counted in MPDU mic */
3935 #ifdef CONFIG_MAC80211_MESH
3936                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3937                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3938 #endif
3939                 CALL_RXH(ieee80211_rx_h_amsdu);
3940                 CALL_RXH(ieee80211_rx_h_data);
3941
3942                 /* special treatment -- needs the queue */
3943                 res = ieee80211_rx_h_ctrl(rx, frames);
3944                 if (res != RX_CONTINUE)
3945                         goto rxh_next;
3946
3947                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3948                 CALL_RXH(ieee80211_rx_h_action);
3949                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3950                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3951                 CALL_RXH(ieee80211_rx_h_action_return);
3952                 CALL_RXH(ieee80211_rx_h_ext);
3953                 CALL_RXH(ieee80211_rx_h_mgmt);
3954
3955  rxh_next:
3956                 ieee80211_rx_handlers_result(rx, res);
3957
3958 #undef CALL_RXH
3959         }
3960
3961         spin_unlock_bh(&rx->local->rx_path_lock);
3962 }
3963
3964 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3965 {
3966         struct sk_buff_head reorder_release;
3967         ieee80211_rx_result res = RX_DROP_MONITOR;
3968
3969         __skb_queue_head_init(&reorder_release);
3970
3971 #define CALL_RXH(rxh)                   \
3972         do {                            \
3973                 res = rxh(rx);          \
3974                 if (res != RX_CONTINUE) \
3975                         goto rxh_next;  \
3976         } while (0)
3977
3978         CALL_RXH(ieee80211_rx_h_check_dup);
3979         CALL_RXH(ieee80211_rx_h_check);
3980
3981         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3982
3983         ieee80211_rx_handlers(rx, &reorder_release);
3984         return;
3985
3986  rxh_next:
3987         ieee80211_rx_handlers_result(rx, res);
3988
3989 #undef CALL_RXH
3990 }
3991
3992 /*
3993  * This function makes calls into the RX path, therefore
3994  * it has to be invoked under RCU read lock.
3995  */
3996 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3997 {
3998         struct sk_buff_head frames;
3999         struct ieee80211_rx_data rx = {
4000                 .sta = sta,
4001                 .sdata = sta->sdata,
4002                 .local = sta->local,
4003                 /* This is OK -- must be QoS data frame */
4004                 .security_idx = tid,
4005                 .seqno_idx = tid,
4006         };
4007         struct tid_ampdu_rx *tid_agg_rx;
4008
4009         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4010         if (!tid_agg_rx)
4011                 return;
4012
4013         __skb_queue_head_init(&frames);
4014
4015         spin_lock(&tid_agg_rx->reorder_lock);
4016         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4017         spin_unlock(&tid_agg_rx->reorder_lock);
4018
4019         if (!skb_queue_empty(&frames)) {
4020                 struct ieee80211_event event = {
4021                         .type = BA_FRAME_TIMEOUT,
4022                         .u.ba.tid = tid,
4023                         .u.ba.sta = &sta->sta,
4024                 };
4025                 drv_event_callback(rx.local, rx.sdata, &event);
4026         }
4027
4028         ieee80211_rx_handlers(&rx, &frames);
4029 }
4030
4031 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4032                                           u16 ssn, u64 filtered,
4033                                           u16 received_mpdus)
4034 {
4035         struct sta_info *sta;
4036         struct tid_ampdu_rx *tid_agg_rx;
4037         struct sk_buff_head frames;
4038         struct ieee80211_rx_data rx = {
4039                 /* This is OK -- must be QoS data frame */
4040                 .security_idx = tid,
4041                 .seqno_idx = tid,
4042         };
4043         int i, diff;
4044
4045         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4046                 return;
4047
4048         __skb_queue_head_init(&frames);
4049
4050         sta = container_of(pubsta, struct sta_info, sta);
4051
4052         rx.sta = sta;
4053         rx.sdata = sta->sdata;
4054         rx.local = sta->local;
4055
4056         rcu_read_lock();
4057         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4058         if (!tid_agg_rx)
4059                 goto out;
4060
4061         spin_lock_bh(&tid_agg_rx->reorder_lock);
4062
4063         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4064                 int release;
4065
4066                 /* release all frames in the reorder buffer */
4067                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4068                            IEEE80211_SN_MODULO;
4069                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4070                                                  release, &frames);
4071                 /* update ssn to match received ssn */
4072                 tid_agg_rx->head_seq_num = ssn;
4073         } else {
4074                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4075                                                  &frames);
4076         }
4077
4078         /* handle the case that received ssn is behind the mac ssn.
4079          * it can be tid_agg_rx->buf_size behind and still be valid */
4080         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4081         if (diff >= tid_agg_rx->buf_size) {
4082                 tid_agg_rx->reorder_buf_filtered = 0;
4083                 goto release;
4084         }
4085         filtered = filtered >> diff;
4086         ssn += diff;
4087
4088         /* update bitmap */
4089         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4090                 int index = (ssn + i) % tid_agg_rx->buf_size;
4091
4092                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4093                 if (filtered & BIT_ULL(i))
4094                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4095         }
4096
4097         /* now process also frames that the filter marking released */
4098         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4099
4100 release:
4101         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4102
4103         ieee80211_rx_handlers(&rx, &frames);
4104
4105  out:
4106         rcu_read_unlock();
4107 }
4108 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4109
4110 /* main receive path */
4111
4112 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4113 {
4114         struct ieee80211_sub_if_data *sdata = rx->sdata;
4115         struct sk_buff *skb = rx->skb;
4116         struct ieee80211_hdr *hdr = (void *)skb->data;
4117         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4118         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4119         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4120                          ieee80211_is_s1g_beacon(hdr->frame_control);
4121
4122         switch (sdata->vif.type) {
4123         case NL80211_IFTYPE_STATION:
4124                 if (!bssid && !sdata->u.mgd.use_4addr)
4125                         return false;
4126                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4127                         return false;
4128                 if (multicast)
4129                         return true;
4130                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4131         case NL80211_IFTYPE_ADHOC:
4132                 if (!bssid)
4133                         return false;
4134                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4135                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4136                     !is_valid_ether_addr(hdr->addr2))
4137                         return false;
4138                 if (ieee80211_is_beacon(hdr->frame_control))
4139                         return true;
4140                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4141                         return false;
4142                 if (!multicast &&
4143                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4144                         return false;
4145                 if (!rx->sta) {
4146                         int rate_idx;
4147                         if (status->encoding != RX_ENC_LEGACY)
4148                                 rate_idx = 0; /* TODO: HT/VHT rates */
4149                         else
4150                                 rate_idx = status->rate_idx;
4151                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4152                                                  BIT(rate_idx));
4153                 }
4154                 return true;
4155         case NL80211_IFTYPE_OCB:
4156                 if (!bssid)
4157                         return false;
4158                 if (!ieee80211_is_data_present(hdr->frame_control))
4159                         return false;
4160                 if (!is_broadcast_ether_addr(bssid))
4161                         return false;
4162                 if (!multicast &&
4163                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4164                         return false;
4165                 if (!rx->sta) {
4166                         int rate_idx;
4167                         if (status->encoding != RX_ENC_LEGACY)
4168                                 rate_idx = 0; /* TODO: HT rates */
4169                         else
4170                                 rate_idx = status->rate_idx;
4171                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4172                                                 BIT(rate_idx));
4173                 }
4174                 return true;
4175         case NL80211_IFTYPE_MESH_POINT:
4176                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4177                         return false;
4178                 if (multicast)
4179                         return true;
4180                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4181         case NL80211_IFTYPE_AP_VLAN:
4182         case NL80211_IFTYPE_AP:
4183                 if (!bssid)
4184                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4185
4186                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4187                         /*
4188                          * Accept public action frames even when the
4189                          * BSSID doesn't match, this is used for P2P
4190                          * and location updates. Note that mac80211
4191                          * itself never looks at these frames.
4192                          */
4193                         if (!multicast &&
4194                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4195                                 return false;
4196                         if (ieee80211_is_public_action(hdr, skb->len))
4197                                 return true;
4198                         return ieee80211_is_beacon(hdr->frame_control);
4199                 }
4200
4201                 if (!ieee80211_has_tods(hdr->frame_control)) {
4202                         /* ignore data frames to TDLS-peers */
4203                         if (ieee80211_is_data(hdr->frame_control))
4204                                 return false;
4205                         /* ignore action frames to TDLS-peers */
4206                         if (ieee80211_is_action(hdr->frame_control) &&
4207                             !is_broadcast_ether_addr(bssid) &&
4208                             !ether_addr_equal(bssid, hdr->addr1))
4209                                 return false;
4210                 }
4211
4212                 /*
4213                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4214                  * the BSSID - we've checked that already but may have accepted
4215                  * the wildcard (ff:ff:ff:ff:ff:ff).
4216                  *
4217                  * It also says:
4218                  *      The BSSID of the Data frame is determined as follows:
4219                  *      a) If the STA is contained within an AP or is associated
4220                  *         with an AP, the BSSID is the address currently in use
4221                  *         by the STA contained in the AP.
4222                  *
4223                  * So we should not accept data frames with an address that's
4224                  * multicast.
4225                  *
4226                  * Accepting it also opens a security problem because stations
4227                  * could encrypt it with the GTK and inject traffic that way.
4228                  */
4229                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4230                         return false;
4231
4232                 return true;
4233         case NL80211_IFTYPE_P2P_DEVICE:
4234                 return ieee80211_is_public_action(hdr, skb->len) ||
4235                        ieee80211_is_probe_req(hdr->frame_control) ||
4236                        ieee80211_is_probe_resp(hdr->frame_control) ||
4237                        ieee80211_is_beacon(hdr->frame_control);
4238         case NL80211_IFTYPE_NAN:
4239                 /* Currently no frames on NAN interface are allowed */
4240                 return false;
4241         default:
4242                 break;
4243         }
4244
4245         WARN_ON_ONCE(1);
4246         return false;
4247 }
4248
4249 void ieee80211_check_fast_rx(struct sta_info *sta)
4250 {
4251         struct ieee80211_sub_if_data *sdata = sta->sdata;
4252         struct ieee80211_local *local = sdata->local;
4253         struct ieee80211_key *key;
4254         struct ieee80211_fast_rx fastrx = {
4255                 .dev = sdata->dev,
4256                 .vif_type = sdata->vif.type,
4257                 .control_port_protocol = sdata->control_port_protocol,
4258         }, *old, *new = NULL;
4259         bool set_offload = false;
4260         bool assign = false;
4261         bool offload;
4262
4263         /* use sparse to check that we don't return without updating */
4264         __acquire(check_fast_rx);
4265
4266         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4267         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4268         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4269         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4270
4271         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4272
4273         /* fast-rx doesn't do reordering */
4274         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4275             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4276                 goto clear;
4277
4278         switch (sdata->vif.type) {
4279         case NL80211_IFTYPE_STATION:
4280                 if (sta->sta.tdls) {
4281                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4282                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4283                         fastrx.expected_ds_bits = 0;
4284                 } else {
4285                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4286                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4287                         fastrx.expected_ds_bits =
4288                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4289                 }
4290
4291                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4292                         fastrx.expected_ds_bits |=
4293                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4294                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4295                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4296                 }
4297
4298                 if (!sdata->u.mgd.powersave)
4299                         break;
4300
4301                 /* software powersave is a huge mess, avoid all of it */
4302                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4303                         goto clear;
4304                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4305                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4306                         goto clear;
4307                 break;
4308         case NL80211_IFTYPE_AP_VLAN:
4309         case NL80211_IFTYPE_AP:
4310                 /* parallel-rx requires this, at least with calls to
4311                  * ieee80211_sta_ps_transition()
4312                  */
4313                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4314                         goto clear;
4315                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4316                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4317                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4318
4319                 fastrx.internal_forward =
4320                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4321                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4322                          !sdata->u.vlan.sta);
4323
4324                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4325                     sdata->u.vlan.sta) {
4326                         fastrx.expected_ds_bits |=
4327                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4328                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4329                         fastrx.internal_forward = 0;
4330                 }
4331
4332                 break;
4333         default:
4334                 goto clear;
4335         }
4336
4337         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4338                 goto clear;
4339
4340         rcu_read_lock();
4341         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4342         if (!key)
4343                 key = rcu_dereference(sdata->default_unicast_key);
4344         if (key) {
4345                 switch (key->conf.cipher) {
4346                 case WLAN_CIPHER_SUITE_TKIP:
4347                         /* we don't want to deal with MMIC in fast-rx */
4348                         goto clear_rcu;
4349                 case WLAN_CIPHER_SUITE_CCMP:
4350                 case WLAN_CIPHER_SUITE_CCMP_256:
4351                 case WLAN_CIPHER_SUITE_GCMP:
4352                 case WLAN_CIPHER_SUITE_GCMP_256:
4353                         break;
4354                 default:
4355                         /* We also don't want to deal with
4356                          * WEP or cipher scheme.
4357                          */
4358                         goto clear_rcu;
4359                 }
4360
4361                 fastrx.key = true;
4362                 fastrx.icv_len = key->conf.icv_len;
4363         }
4364
4365         assign = true;
4366  clear_rcu:
4367         rcu_read_unlock();
4368  clear:
4369         __release(check_fast_rx);
4370
4371         if (assign)
4372                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4373
4374         offload = assign &&
4375                   (sdata->vif.offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED);
4376
4377         if (offload)
4378                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4379         else
4380                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4381
4382         if (set_offload)
4383                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4384
4385         spin_lock_bh(&sta->lock);
4386         old = rcu_dereference_protected(sta->fast_rx, true);
4387         rcu_assign_pointer(sta->fast_rx, new);
4388         spin_unlock_bh(&sta->lock);
4389
4390         if (old)
4391                 kfree_rcu(old, rcu_head);
4392 }
4393
4394 void ieee80211_clear_fast_rx(struct sta_info *sta)
4395 {
4396         struct ieee80211_fast_rx *old;
4397
4398         spin_lock_bh(&sta->lock);
4399         old = rcu_dereference_protected(sta->fast_rx, true);
4400         RCU_INIT_POINTER(sta->fast_rx, NULL);
4401         spin_unlock_bh(&sta->lock);
4402
4403         if (old)
4404                 kfree_rcu(old, rcu_head);
4405 }
4406
4407 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4408 {
4409         struct ieee80211_local *local = sdata->local;
4410         struct sta_info *sta;
4411
4412         lockdep_assert_held(&local->sta_mtx);
4413
4414         list_for_each_entry(sta, &local->sta_list, list) {
4415                 if (sdata != sta->sdata &&
4416                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4417                         continue;
4418                 ieee80211_check_fast_rx(sta);
4419         }
4420 }
4421
4422 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4423 {
4424         struct ieee80211_local *local = sdata->local;
4425
4426         mutex_lock(&local->sta_mtx);
4427         __ieee80211_check_fast_rx_iface(sdata);
4428         mutex_unlock(&local->sta_mtx);
4429 }
4430
4431 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4432                               struct ieee80211_fast_rx *fast_rx,
4433                               int orig_len)
4434 {
4435         struct ieee80211_sta_rx_stats *stats;
4436         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4437         struct sta_info *sta = rx->sta;
4438         struct sk_buff *skb = rx->skb;
4439         void *sa = skb->data + ETH_ALEN;
4440         void *da = skb->data;
4441
4442         stats = &sta->rx_stats;
4443         if (fast_rx->uses_rss)
4444                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4445
4446         /* statistics part of ieee80211_rx_h_sta_process() */
4447         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4448                 stats->last_signal = status->signal;
4449                 if (!fast_rx->uses_rss)
4450                         ewma_signal_add(&sta->rx_stats_avg.signal,
4451                                         -status->signal);
4452         }
4453
4454         if (status->chains) {
4455                 int i;
4456
4457                 stats->chains = status->chains;
4458                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4459                         int signal = status->chain_signal[i];
4460
4461                         if (!(status->chains & BIT(i)))
4462                                 continue;
4463
4464                         stats->chain_signal_last[i] = signal;
4465                         if (!fast_rx->uses_rss)
4466                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4467                                                 -signal);
4468                 }
4469         }
4470         /* end of statistics */
4471
4472         stats->last_rx = jiffies;
4473         stats->last_rate = sta_stats_encode_rate(status);
4474
4475         stats->fragments++;
4476         stats->packets++;
4477
4478         skb->dev = fast_rx->dev;
4479
4480         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4481
4482         /* The seqno index has the same property as needed
4483          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4484          * for non-QoS-data frames. Here we know it's a data
4485          * frame, so count MSDUs.
4486          */
4487         u64_stats_update_begin(&stats->syncp);
4488         stats->msdu[rx->seqno_idx]++;
4489         stats->bytes += orig_len;
4490         u64_stats_update_end(&stats->syncp);
4491
4492         if (fast_rx->internal_forward) {
4493                 struct sk_buff *xmit_skb = NULL;
4494                 if (is_multicast_ether_addr(da)) {
4495                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4496                 } else if (!ether_addr_equal(da, sa) &&
4497                            sta_info_get(rx->sdata, da)) {
4498                         xmit_skb = skb;
4499                         skb = NULL;
4500                 }
4501
4502                 if (xmit_skb) {
4503                         /*
4504                          * Send to wireless media and increase priority by 256
4505                          * to keep the received priority instead of
4506                          * reclassifying the frame (see cfg80211_classify8021d).
4507                          */
4508                         xmit_skb->priority += 256;
4509                         xmit_skb->protocol = htons(ETH_P_802_3);
4510                         skb_reset_network_header(xmit_skb);
4511                         skb_reset_mac_header(xmit_skb);
4512                         dev_queue_xmit(xmit_skb);
4513                 }
4514
4515                 if (!skb)
4516                         return;
4517         }
4518
4519         /* deliver to local stack */
4520         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4521         ieee80211_deliver_skb_to_local_stack(skb, rx);
4522 }
4523
4524 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4525                                      struct ieee80211_fast_rx *fast_rx)
4526 {
4527         struct sk_buff *skb = rx->skb;
4528         struct ieee80211_hdr *hdr = (void *)skb->data;
4529         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4530         struct sta_info *sta = rx->sta;
4531         int orig_len = skb->len;
4532         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4533         int snap_offs = hdrlen;
4534         struct {
4535                 u8 snap[sizeof(rfc1042_header)];
4536                 __be16 proto;
4537         } *payload __aligned(2);
4538         struct {
4539                 u8 da[ETH_ALEN];
4540                 u8 sa[ETH_ALEN];
4541         } addrs __aligned(2);
4542         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4543
4544         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4545          * to a common data structure; drivers can implement that per queue
4546          * but we don't have that information in mac80211
4547          */
4548         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4549                 return false;
4550
4551 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4552
4553         /* If using encryption, we also need to have:
4554          *  - PN_VALIDATED: similar, but the implementation is tricky
4555          *  - DECRYPTED: necessary for PN_VALIDATED
4556          */
4557         if (fast_rx->key &&
4558             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4559                 return false;
4560
4561         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4562                 return false;
4563
4564         if (unlikely(ieee80211_is_frag(hdr)))
4565                 return false;
4566
4567         /* Since our interface address cannot be multicast, this
4568          * implicitly also rejects multicast frames without the
4569          * explicit check.
4570          *
4571          * We shouldn't get any *data* frames not addressed to us
4572          * (AP mode will accept multicast *management* frames), but
4573          * punting here will make it go through the full checks in
4574          * ieee80211_accept_frame().
4575          */
4576         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4577                 return false;
4578
4579         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4580                                               IEEE80211_FCTL_TODS)) !=
4581             fast_rx->expected_ds_bits)
4582                 return false;
4583
4584         /* assign the key to drop unencrypted frames (later)
4585          * and strip the IV/MIC if necessary
4586          */
4587         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4588                 /* GCMP header length is the same */
4589                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4590         }
4591
4592         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4593                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4594                         goto drop;
4595
4596                 payload = (void *)(skb->data + snap_offs);
4597
4598                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4599                         return false;
4600
4601                 /* Don't handle these here since they require special code.
4602                  * Accept AARP and IPX even though they should come with a
4603                  * bridge-tunnel header - but if we get them this way then
4604                  * there's little point in discarding them.
4605                  */
4606                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4607                              payload->proto == fast_rx->control_port_protocol))
4608                         return false;
4609         }
4610
4611         /* after this point, don't punt to the slowpath! */
4612
4613         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4614             pskb_trim(skb, skb->len - fast_rx->icv_len))
4615                 goto drop;
4616
4617         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4618                 goto drop;
4619
4620         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4621                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4622                     RX_QUEUED)
4623                         goto drop;
4624
4625                 return true;
4626         }
4627
4628         /* do the header conversion - first grab the addresses */
4629         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4630         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4631         /* remove the SNAP but leave the ethertype */
4632         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4633         /* push the addresses in front */
4634         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4635
4636         ieee80211_rx_8023(rx, fast_rx, orig_len);
4637
4638         return true;
4639  drop:
4640         dev_kfree_skb(skb);
4641         if (fast_rx->uses_rss)
4642                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4643
4644         stats->dropped++;
4645         return true;
4646 }
4647
4648 /*
4649  * This function returns whether or not the SKB
4650  * was destined for RX processing or not, which,
4651  * if consume is true, is equivalent to whether
4652  * or not the skb was consumed.
4653  */
4654 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4655                                             struct sk_buff *skb, bool consume)
4656 {
4657         struct ieee80211_local *local = rx->local;
4658         struct ieee80211_sub_if_data *sdata = rx->sdata;
4659
4660         rx->skb = skb;
4661
4662         /* See if we can do fast-rx; if we have to copy we already lost,
4663          * so punt in that case. We should never have to deliver a data
4664          * frame to multiple interfaces anyway.
4665          *
4666          * We skip the ieee80211_accept_frame() call and do the necessary
4667          * checking inside ieee80211_invoke_fast_rx().
4668          */
4669         if (consume && rx->sta) {
4670                 struct ieee80211_fast_rx *fast_rx;
4671
4672                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4673                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4674                         return true;
4675         }
4676
4677         if (!ieee80211_accept_frame(rx))
4678                 return false;
4679
4680         if (!consume) {
4681                 skb = skb_copy(skb, GFP_ATOMIC);
4682                 if (!skb) {
4683                         if (net_ratelimit())
4684                                 wiphy_debug(local->hw.wiphy,
4685                                         "failed to copy skb for %s\n",
4686                                         sdata->name);
4687                         return true;
4688                 }
4689
4690                 rx->skb = skb;
4691         }
4692
4693         ieee80211_invoke_rx_handlers(rx);
4694         return true;
4695 }
4696
4697 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4698                                        struct ieee80211_sta *pubsta,
4699                                        struct sk_buff *skb,
4700                                        struct list_head *list)
4701 {
4702         struct ieee80211_local *local = hw_to_local(hw);
4703         struct ieee80211_fast_rx *fast_rx;
4704         struct ieee80211_rx_data rx;
4705
4706         memset(&rx, 0, sizeof(rx));
4707         rx.skb = skb;
4708         rx.local = local;
4709         rx.list = list;
4710
4711         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4712
4713         /* drop frame if too short for header */
4714         if (skb->len < sizeof(struct ethhdr))
4715                 goto drop;
4716
4717         if (!pubsta)
4718                 goto drop;
4719
4720         rx.sta = container_of(pubsta, struct sta_info, sta);
4721         rx.sdata = rx.sta->sdata;
4722
4723         fast_rx = rcu_dereference(rx.sta->fast_rx);
4724         if (!fast_rx)
4725                 goto drop;
4726
4727         ieee80211_rx_8023(&rx, fast_rx, skb->len);
4728         return;
4729
4730 drop:
4731         dev_kfree_skb(skb);
4732 }
4733
4734 /*
4735  * This is the actual Rx frames handler. as it belongs to Rx path it must
4736  * be called with rcu_read_lock protection.
4737  */
4738 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4739                                          struct ieee80211_sta *pubsta,
4740                                          struct sk_buff *skb,
4741                                          struct list_head *list)
4742 {
4743         struct ieee80211_local *local = hw_to_local(hw);
4744         struct ieee80211_sub_if_data *sdata;
4745         struct ieee80211_hdr *hdr;
4746         __le16 fc;
4747         struct ieee80211_rx_data rx;
4748         struct ieee80211_sub_if_data *prev;
4749         struct rhlist_head *tmp;
4750         int err = 0;
4751
4752         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4753         memset(&rx, 0, sizeof(rx));
4754         rx.skb = skb;
4755         rx.local = local;
4756         rx.list = list;
4757
4758         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4759                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4760
4761         if (ieee80211_is_mgmt(fc)) {
4762                 /* drop frame if too short for header */
4763                 if (skb->len < ieee80211_hdrlen(fc))
4764                         err = -ENOBUFS;
4765                 else
4766                         err = skb_linearize(skb);
4767         } else {
4768                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4769         }
4770
4771         if (err) {
4772                 dev_kfree_skb(skb);
4773                 return;
4774         }
4775
4776         hdr = (struct ieee80211_hdr *)skb->data;
4777         ieee80211_parse_qos(&rx);
4778         ieee80211_verify_alignment(&rx);
4779
4780         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4781                      ieee80211_is_beacon(hdr->frame_control) ||
4782                      ieee80211_is_s1g_beacon(hdr->frame_control)))
4783                 ieee80211_scan_rx(local, skb);
4784
4785         if (ieee80211_is_data(fc)) {
4786                 struct sta_info *sta, *prev_sta;
4787
4788                 if (pubsta) {
4789                         rx.sta = container_of(pubsta, struct sta_info, sta);
4790                         rx.sdata = rx.sta->sdata;
4791                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4792                                 return;
4793                         goto out;
4794                 }
4795
4796                 prev_sta = NULL;
4797
4798                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4799                         if (!prev_sta) {
4800                                 prev_sta = sta;
4801                                 continue;
4802                         }
4803
4804                         rx.sta = prev_sta;
4805                         rx.sdata = prev_sta->sdata;
4806                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4807
4808                         prev_sta = sta;
4809                 }
4810
4811                 if (prev_sta) {
4812                         rx.sta = prev_sta;
4813                         rx.sdata = prev_sta->sdata;
4814
4815                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4816                                 return;
4817                         goto out;
4818                 }
4819         }
4820
4821         prev = NULL;
4822
4823         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4824                 if (!ieee80211_sdata_running(sdata))
4825                         continue;
4826
4827                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4828                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4829                         continue;
4830
4831                 /*
4832                  * frame is destined for this interface, but if it's
4833                  * not also for the previous one we handle that after
4834                  * the loop to avoid copying the SKB once too much
4835                  */
4836
4837                 if (!prev) {
4838                         prev = sdata;
4839                         continue;
4840                 }
4841
4842                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4843                 rx.sdata = prev;
4844                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4845
4846                 prev = sdata;
4847         }
4848
4849         if (prev) {
4850                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4851                 rx.sdata = prev;
4852
4853                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4854                         return;
4855         }
4856
4857  out:
4858         dev_kfree_skb(skb);
4859 }
4860
4861 /*
4862  * This is the receive path handler. It is called by a low level driver when an
4863  * 802.11 MPDU is received from the hardware.
4864  */
4865 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4866                        struct sk_buff *skb, struct list_head *list)
4867 {
4868         struct ieee80211_local *local = hw_to_local(hw);
4869         struct ieee80211_rate *rate = NULL;
4870         struct ieee80211_supported_band *sband;
4871         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4872         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4873
4874         WARN_ON_ONCE(softirq_count() == 0);
4875
4876         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4877                 goto drop;
4878
4879         sband = local->hw.wiphy->bands[status->band];
4880         if (WARN_ON(!sband))
4881                 goto drop;
4882
4883         /*
4884          * If we're suspending, it is possible although not too likely
4885          * that we'd be receiving frames after having already partially
4886          * quiesced the stack. We can't process such frames then since
4887          * that might, for example, cause stations to be added or other
4888          * driver callbacks be invoked.
4889          */
4890         if (unlikely(local->quiescing || local->suspended))
4891                 goto drop;
4892
4893         /* We might be during a HW reconfig, prevent Rx for the same reason */
4894         if (unlikely(local->in_reconfig))
4895                 goto drop;
4896
4897         /*
4898          * The same happens when we're not even started,
4899          * but that's worth a warning.
4900          */
4901         if (WARN_ON(!local->started))
4902                 goto drop;
4903
4904         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4905                 /*
4906                  * Validate the rate, unless a PLCP error means that
4907                  * we probably can't have a valid rate here anyway.
4908                  */
4909
4910                 switch (status->encoding) {
4911                 case RX_ENC_HT:
4912                         /*
4913                          * rate_idx is MCS index, which can be [0-76]
4914                          * as documented on:
4915                          *
4916                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4917                          *
4918                          * Anything else would be some sort of driver or
4919                          * hardware error. The driver should catch hardware
4920                          * errors.
4921                          */
4922                         if (WARN(status->rate_idx > 76,
4923                                  "Rate marked as an HT rate but passed "
4924                                  "status->rate_idx is not "
4925                                  "an MCS index [0-76]: %d (0x%02x)\n",
4926                                  status->rate_idx,
4927                                  status->rate_idx))
4928                                 goto drop;
4929                         break;
4930                 case RX_ENC_VHT:
4931                         if (WARN_ONCE(status->rate_idx > 11 ||
4932                                       !status->nss ||
4933                                       status->nss > 8,
4934                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4935                                       status->rate_idx, status->nss))
4936                                 goto drop;
4937                         break;
4938                 case RX_ENC_HE:
4939                         if (WARN_ONCE(status->rate_idx > 11 ||
4940                                       !status->nss ||
4941                                       status->nss > 8,
4942                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4943                                       status->rate_idx, status->nss))
4944                                 goto drop;
4945                         break;
4946                 default:
4947                         WARN_ON_ONCE(1);
4948                         fallthrough;
4949                 case RX_ENC_LEGACY:
4950                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4951                                 goto drop;
4952                         rate = &sband->bitrates[status->rate_idx];
4953                 }
4954         }
4955
4956         status->rx_flags = 0;
4957
4958         kcov_remote_start_common(skb_get_kcov_handle(skb));
4959
4960         /*
4961          * Frames with failed FCS/PLCP checksum are not returned,
4962          * all other frames are returned without radiotap header
4963          * if it was previously present.
4964          * Also, frames with less than 16 bytes are dropped.
4965          */
4966         if (!(status->flag & RX_FLAG_8023))
4967                 skb = ieee80211_rx_monitor(local, skb, rate);
4968         if (skb) {
4969                 if ((status->flag & RX_FLAG_8023) ||
4970                         ieee80211_is_data_present(hdr->frame_control))
4971                         ieee80211_tpt_led_trig_rx(local, skb->len);
4972
4973                 if (status->flag & RX_FLAG_8023)
4974                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
4975                 else
4976                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
4977         }
4978
4979         kcov_remote_stop();
4980         return;
4981  drop:
4982         kfree_skb(skb);
4983 }
4984 EXPORT_SYMBOL(ieee80211_rx_list);
4985
4986 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4987                        struct sk_buff *skb, struct napi_struct *napi)
4988 {
4989         struct sk_buff *tmp;
4990         LIST_HEAD(list);
4991
4992
4993         /*
4994          * key references and virtual interfaces are protected using RCU
4995          * and this requires that we are in a read-side RCU section during
4996          * receive processing
4997          */
4998         rcu_read_lock();
4999         ieee80211_rx_list(hw, pubsta, skb, &list);
5000         rcu_read_unlock();
5001
5002         if (!napi) {
5003                 netif_receive_skb_list(&list);
5004                 return;
5005         }
5006
5007         list_for_each_entry_safe(skb, tmp, &list, list) {
5008                 skb_list_del_init(skb);
5009                 napi_gro_receive(napi, skb);
5010         }
5011 }
5012 EXPORT_SYMBOL(ieee80211_rx_napi);
5013
5014 /* This is a version of the rx handler that can be called from hard irq
5015  * context. Post the skb on the queue and schedule the tasklet */
5016 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5017 {
5018         struct ieee80211_local *local = hw_to_local(hw);
5019
5020         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5021
5022         skb->pkt_type = IEEE80211_RX_MSG;
5023         skb_queue_tail(&local->skb_queue, skb);
5024         tasklet_schedule(&local->tasklet);
5025 }
5026 EXPORT_SYMBOL(ieee80211_rx_irqsafe);