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 <[email protected]>
   6  * Copyright 2007-2010  Johannes Berg <[email protected]>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   9  * Copyright (C) 2018-2022 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                                            int link_id,
 219                                            struct sta_info *sta,
 220                                            struct sk_buff *skb)
 221 {
 222         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 223
 224         if (link_id >= 0) {
 225                 status->link_valid = 1;
 226                 status->link_id = link_id;
 227         } else {
 228                 status->link_valid = 0;
 229         }
 230
 231         skb_queue_tail(&sdata->skb_queue, skb);
 232         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 233         if (sta)
 234                 sta->deflink.rx_stats.packets++;
 235 }
 236
 237 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
 238                                          int link_id,
 239                                          struct sta_info *sta,
 240                                          struct sk_buff *skb)
 241 {
 242         skb->protocol = 0;
 243         __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
 244 }
 245
 246 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 247                                          struct sk_buff *skb,
 248                                          int rtap_space)
 249 {
 250         struct {
 251                 struct ieee80211_hdr_3addr hdr;
 252                 u8 category;
 253                 u8 action_code;
 254         } __packed __aligned(2) action;
 255
 256         if (!sdata)
 257                 return;
 258
 259         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 260
 261         if (skb->len < rtap_space + sizeof(action) +
 262                        VHT_MUMIMO_GROUPS_DATA_LEN)
 263                 return;
 264
 265         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 266                 return;
 267
 268         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 269
 270         if (!ieee80211_is_action(action.hdr.frame_control))
 271                 return;
 272
 273         if (action.category != WLAN_CATEGORY_VHT)
 274                 return;
 275
 276         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 277                 return;
 278
 279         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 280                 return;
 281
 282         skb = skb_copy(skb, GFP_ATOMIC);
 283         if (!skb)
 284                 return;
 285
 286         ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
 287 }
 288
 289 /*
 290  * ieee80211_add_rx_radiotap_header - add radiotap header
 291  *
 292  * add a radiotap header containing all the fields which the hardware provided.
 293  */
 294 static void
 295 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 296                                  struct sk_buff *skb,
 297                                  struct ieee80211_rate *rate,
 298                                  int rtap_len, bool has_fcs)
 299 {
 300         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 301         struct ieee80211_radiotap_header *rthdr;
 302         unsigned char *pos;
 303         __le32 *it_present;
 304         u32 it_present_val;
 305         u16 rx_flags = 0;
 306         u16 channel_flags = 0;
 307         int mpdulen, chain;
 308         unsigned long chains = status->chains;
 309         struct ieee80211_vendor_radiotap rtap = {};
 310         struct ieee80211_radiotap_he he = {};
 311         struct ieee80211_radiotap_he_mu he_mu = {};
 312         struct ieee80211_radiotap_lsig lsig = {};
 313
 314         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 315                 he = *(struct ieee80211_radiotap_he *)skb->data;
 316                 skb_pull(skb, sizeof(he));
 317                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 318         }
 319
 320         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 321                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 322                 skb_pull(skb, sizeof(he_mu));
 323         }
 324
 325         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 326                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 327                 skb_pull(skb, sizeof(lsig));
 328         }
 329
 330         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 331                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 332                 /* rtap.len and rtap.pad are undone immediately */
 333                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 334         }
 335
 336         mpdulen = skb->len;
 337         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 338                 mpdulen += FCS_LEN;
 339
 340         rthdr = skb_push(skb, rtap_len);
 341         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 342         it_present = &rthdr->it_present;
 343
 344         /* radiotap header, set always present flags */
 345         rthdr->it_len = cpu_to_le16(rtap_len);
 346         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 347                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 348                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 349
 350         if (!status->chains)
 351                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 352
 353         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 354                 it_present_val |=
 355                         BIT(IEEE80211_RADIOTAP_EXT) |
 356                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 357                 put_unaligned_le32(it_present_val, it_present);
 358                 it_present++;
 359                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 360                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 361         }
 362
 363         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 364                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 365                                   BIT(IEEE80211_RADIOTAP_EXT);
 366                 put_unaligned_le32(it_present_val, it_present);
 367                 it_present++;
 368                 it_present_val = rtap.present;
 369         }
 370
 371         put_unaligned_le32(it_present_val, it_present);
 372
 373         /* This references through an offset into it_optional[] rather
 374          * than via it_present otherwise later uses of pos will cause
 375          * the compiler to think we have walked past the end of the
 376          * struct member.
 377          */
 378         pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
 379
 380         /* the order of the following fields is important */
 381
 382         /* IEEE80211_RADIOTAP_TSFT */
 383         if (ieee80211_have_rx_timestamp(status)) {
 384                 /* padding */
 385                 while ((pos - (u8 *)rthdr) & 7)
 386                         *pos++ = 0;
 387                 put_unaligned_le64(
 388                         ieee80211_calculate_rx_timestamp(local, status,
 389                                                          mpdulen, 0),
 390                         pos);
 391                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
 392                 pos += 8;
 393         }
 394
 395         /* IEEE80211_RADIOTAP_FLAGS */
 396         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 397                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 398         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 399                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 400         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 401                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 402         pos++;
 403
 404         /* IEEE80211_RADIOTAP_RATE */
 405         if (!rate || status->encoding != RX_ENC_LEGACY) {
 406                 /*
 407                  * Without rate information don't add it. If we have,
 408                  * MCS information is a separate field in radiotap,
 409                  * added below. The byte here is needed as padding
 410                  * for the channel though, so initialise it to 0.
 411                  */
 412                 *pos = 0;
 413         } else {
 414                 int shift = 0;
 415                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 416                 if (status->bw == RATE_INFO_BW_10)
 417                         shift = 1;
 418                 else if (status->bw == RATE_INFO_BW_5)
 419                         shift = 2;
 420                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 421         }
 422         pos++;
 423
 424         /* IEEE80211_RADIOTAP_CHANNEL */
 425         /* TODO: frequency offset in KHz */
 426         put_unaligned_le16(status->freq, pos);
 427         pos += 2;
 428         if (status->bw == RATE_INFO_BW_10)
 429                 channel_flags |= IEEE80211_CHAN_HALF;
 430         else if (status->bw == RATE_INFO_BW_5)
 431                 channel_flags |= IEEE80211_CHAN_QUARTER;
 432
 433         if (status->band == NL80211_BAND_5GHZ ||
 434             status->band == NL80211_BAND_6GHZ)
 435                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 436         else if (status->encoding != RX_ENC_LEGACY)
 437                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 438         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 439                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 440         else if (rate)
 441                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 442         else
 443                 channel_flags |= IEEE80211_CHAN_2GHZ;
 444         put_unaligned_le16(channel_flags, pos);
 445         pos += 2;
 446
 447         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 448         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 449             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 450                 *pos = status->signal;
 451                 rthdr->it_present |=
 452                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
 453                 pos++;
 454         }
 455
 456         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 457
 458         if (!status->chains) {
 459                 /* IEEE80211_RADIOTAP_ANTENNA */
 460                 *pos = status->antenna;
 461                 pos++;
 462         }
 463
 464         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 465
 466         /* IEEE80211_RADIOTAP_RX_FLAGS */
 467         /* ensure 2 byte alignment for the 2 byte field as required */
 468         if ((pos - (u8 *)rthdr) & 1)
 469                 *pos++ = 0;
 470         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 471                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 472         put_unaligned_le16(rx_flags, pos);
 473         pos += 2;
 474
 475         if (status->encoding == RX_ENC_HT) {
 476                 unsigned int stbc;
 477
 478                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 479                 *pos = local->hw.radiotap_mcs_details;
 480                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 481                         *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
 482                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 483                         *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
 484                 pos++;
 485                 *pos = 0;
 486                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 487                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 488                 if (status->bw == RATE_INFO_BW_40)
 489                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 490                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 491                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 492                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 493                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 494                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 495                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 496                 pos++;
 497                 *pos++ = status->rate_idx;
 498         }
 499
 500         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 501                 u16 flags = 0;
 502
 503                 /* ensure 4 byte alignment */
 504                 while ((pos - (u8 *)rthdr) & 3)
 505                         pos++;
 506                 rthdr->it_present |=
 507                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
 508                 put_unaligned_le32(status->ampdu_reference, pos);
 509                 pos += 4;
 510                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 511                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 512                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 513                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 514                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 515                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 516                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 517                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 518                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 519                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 520                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 521                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 522                 put_unaligned_le16(flags, pos);
 523                 pos += 2;
 524                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 525                         *pos++ = status->ampdu_delimiter_crc;
 526                 else
 527                         *pos++ = 0;
 528                 *pos++ = 0;
 529         }
 530
 531         if (status->encoding == RX_ENC_VHT) {
 532                 u16 known = local->hw.radiotap_vht_details;
 533
 534                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 535                 put_unaligned_le16(known, pos);
 536                 pos += 2;
 537                 /* flags */
 538                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 539                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 540                 /* in VHT, STBC is binary */
 541                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 542                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 543                 if (status->enc_flags & RX_ENC_FLAG_BF)
 544                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 545                 pos++;
 546                 /* bandwidth */
 547                 switch (status->bw) {
 548                 case RATE_INFO_BW_80:
 549                         *pos++ = 4;
 550                         break;
 551                 case RATE_INFO_BW_160:
 552                         *pos++ = 11;
 553                         break;
 554                 case RATE_INFO_BW_40:
 555                         *pos++ = 1;
 556                         break;
 557                 default:
 558                         *pos++ = 0;
 559                 }
 560                 /* MCS/NSS */
 561                 *pos = (status->rate_idx << 4) | status->nss;
 562                 pos += 4;
 563                 /* coding field */
 564                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 565                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 566                 pos++;
 567                 /* group ID */
 568                 pos++;
 569                 /* partial_aid */
 570                 pos += 2;
 571         }
 572
 573         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 574                 u16 accuracy = 0;
 575                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 576
 577                 rthdr->it_present |=
 578                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
 579
 580                 /* ensure 8 byte alignment */
 581                 while ((pos - (u8 *)rthdr) & 7)
 582                         pos++;
 583
 584                 put_unaligned_le64(status->device_timestamp, pos);
 585                 pos += sizeof(u64);
 586
 587                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 588                         accuracy = local->hw.radiotap_timestamp.accuracy;
 589                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 590                 }
 591                 put_unaligned_le16(accuracy, pos);
 592                 pos += sizeof(u16);
 593
 594                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 595                 *pos++ = flags;
 596         }
 597
 598         if (status->encoding == RX_ENC_HE &&
 599             status->flag & RX_FLAG_RADIOTAP_HE) {
 600 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 601
 602                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 603                         he.data6 |= HE_PREP(DATA6_NSTS,
 604                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 605                                                       status->enc_flags));
 606                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 607                 } else {
 608                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 609                 }
 610
 611 #define CHECK_GI(s) \
 612         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 613                      (int)NL80211_RATE_INFO_HE_GI_##s)
 614
 615                 CHECK_GI(0_8);
 616                 CHECK_GI(1_6);
 617                 CHECK_GI(3_2);
 618
 619                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 620                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 621                 he.data3 |= HE_PREP(DATA3_CODING,
 622                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 623
 624                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 625
 626                 switch (status->bw) {
 627                 case RATE_INFO_BW_20:
 628                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 629                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 630                         break;
 631                 case RATE_INFO_BW_40:
 632                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 633                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 634                         break;
 635                 case RATE_INFO_BW_80:
 636                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 637                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 638                         break;
 639                 case RATE_INFO_BW_160:
 640                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 641                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 642                         break;
 643                 case RATE_INFO_BW_HE_RU:
 644 #define CHECK_RU_ALLOC(s) \
 645         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 646                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 647
 648                         CHECK_RU_ALLOC(26);
 649                         CHECK_RU_ALLOC(52);
 650                         CHECK_RU_ALLOC(106);
 651                         CHECK_RU_ALLOC(242);
 652                         CHECK_RU_ALLOC(484);
 653                         CHECK_RU_ALLOC(996);
 654                         CHECK_RU_ALLOC(2x996);
 655
 656                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 657                                             status->he_ru + 4);
 658                         break;
 659                 default:
 660                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 661                 }
 662
 663                 /* ensure 2 byte alignment */
 664                 while ((pos - (u8 *)rthdr) & 1)
 665                         pos++;
 666                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 667                 memcpy(pos, &he, sizeof(he));
 668                 pos += sizeof(he);
 669         }
 670
 671         if (status->encoding == RX_ENC_HE &&
 672             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 673                 /* ensure 2 byte alignment */
 674                 while ((pos - (u8 *)rthdr) & 1)
 675                         pos++;
 676                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
 677                 memcpy(pos, &he_mu, sizeof(he_mu));
 678                 pos += sizeof(he_mu);
 679         }
 680
 681         if (status->flag & RX_FLAG_NO_PSDU) {
 682                 rthdr->it_present |=
 683                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
 684                 *pos++ = status->zero_length_psdu_type;
 685         }
 686
 687         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 688                 /* ensure 2 byte alignment */
 689                 while ((pos - (u8 *)rthdr) & 1)
 690                         pos++;
 691                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
 692                 memcpy(pos, &lsig, sizeof(lsig));
 693                 pos += sizeof(lsig);
 694         }
 695
 696         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 697                 *pos++ = status->chain_signal[chain];
 698                 *pos++ = chain;
 699         }
 700
 701         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 702                 /* ensure 2 byte alignment for the vendor field as required */
 703                 if ((pos - (u8 *)rthdr) & 1)
 704                         *pos++ = 0;
 705                 *pos++ = rtap.oui[0];
 706                 *pos++ = rtap.oui[1];
 707                 *pos++ = rtap.oui[2];
 708                 *pos++ = rtap.subns;
 709                 put_unaligned_le16(rtap.len, pos);
 710                 pos += 2;
 711                 /* align the actual payload as requested */
 712                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 713                         *pos++ = 0;
 714                 /* data (and possible padding) already follows */
 715         }
 716 }
 717
 718 static struct sk_buff *
 719 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 720                            struct sk_buff **origskb,
 721                            struct ieee80211_rate *rate,
 722                            int rtap_space, bool use_origskb)
 723 {
 724         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 725         int rt_hdrlen, needed_headroom;
 726         struct sk_buff *skb;
 727
 728         /* room for the radiotap header based on driver features */
 729         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 730         needed_headroom = rt_hdrlen - rtap_space;
 731
 732         if (use_origskb) {
 733                 /* only need to expand headroom if necessary */
 734                 skb = *origskb;
 735                 *origskb = NULL;
 736
 737                 /*
 738                  * This shouldn't trigger often because most devices have an
 739                  * RX header they pull before we get here, and that should
 740                  * be big enough for our radiotap information. We should
 741                  * probably export the length to drivers so that we can have
 742                  * them allocate enough headroom to start with.
 743                  */
 744                 if (skb_headroom(skb) < needed_headroom &&
 745                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 746                         dev_kfree_skb(skb);
 747                         return NULL;
 748                 }
 749         } else {
 750                 /*
 751                  * Need to make a copy and possibly remove radiotap header
 752                  * and FCS from the original.
 753                  */
 754                 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
 755                                       0, GFP_ATOMIC);
 756
 757                 if (!skb)
 758                         return NULL;
 759         }
 760
 761         /* prepend radiotap information */
 762         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 763
 764         skb_reset_mac_header(skb);
 765         skb->ip_summed = CHECKSUM_UNNECESSARY;
 766         skb->pkt_type = PACKET_OTHERHOST;
 767         skb->protocol = htons(ETH_P_802_2);
 768
 769         return skb;
 770 }
 771
 772 /*
 773  * This function copies a received frame to all monitor interfaces and
 774  * returns a cleaned-up SKB that no longer includes the FCS nor the
 775  * radiotap header the driver might have added.
 776  */
 777 static struct sk_buff *
 778 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 779                      struct ieee80211_rate *rate)
 780 {
 781         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 782         struct ieee80211_sub_if_data *sdata;
 783         struct sk_buff *monskb = NULL;
 784         int present_fcs_len = 0;
 785         unsigned int rtap_space = 0;
 786         struct ieee80211_sub_if_data *monitor_sdata =
 787                 rcu_dereference(local->monitor_sdata);
 788         bool only_monitor = false;
 789         unsigned int min_head_len;
 790
 791         if (status->flag & RX_FLAG_RADIOTAP_HE)
 792                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 793
 794         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 795                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 796
 797         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 798                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 799
 800         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 801                 struct ieee80211_vendor_radiotap *rtap =
 802                         (void *)(origskb->data + rtap_space);
 803
 804                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 805         }
 806
 807         min_head_len = rtap_space;
 808
 809         /*
 810          * First, we may need to make a copy of the skb because
 811          *  (1) we need to modify it for radiotap (if not present), and
 812          *  (2) the other RX handlers will modify the skb we got.
 813          *
 814          * We don't need to, of course, if we aren't going to return
 815          * the SKB because it has a bad FCS/PLCP checksum.
 816          */
 817
 818         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 819                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 820                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 821                                 /* driver bug */
 822                                 WARN_ON(1);
 823                                 dev_kfree_skb(origskb);
 824                                 return NULL;
 825                         }
 826                         present_fcs_len = FCS_LEN;
 827                 }
 828
 829                 /* also consider the hdr->frame_control */
 830                 min_head_len += 2;
 831         }
 832
 833         /* ensure that the expected data elements are in skb head */
 834         if (!pskb_may_pull(origskb, min_head_len)) {
 835                 dev_kfree_skb(origskb);
 836                 return NULL;
 837         }
 838
 839         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 840
 841         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 842                 if (only_monitor) {
 843                         dev_kfree_skb(origskb);
 844                         return NULL;
 845                 }
 846
 847                 return ieee80211_clean_skb(origskb, present_fcs_len,
 848                                            rtap_space);
 849         }
 850
 851         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 852
 853         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 854                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 855                                                  &local->mon_list);
 856
 857                 if (!monskb)
 858                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 859                                                             rate, rtap_space,
 860                                                             only_monitor &&
 861                                                             last_monitor);
 862
 863                 if (monskb) {
 864                         struct sk_buff *skb;
 865
 866                         if (last_monitor) {
 867                                 skb = monskb;
 868                                 monskb = NULL;
 869                         } else {
 870                                 skb = skb_clone(monskb, GFP_ATOMIC);
 871                         }
 872
 873                         if (skb) {
 874                                 skb->dev = sdata->dev;
 875                                 dev_sw_netstats_rx_add(skb->dev, skb->len);
 876                                 netif_receive_skb(skb);
 877                         }
 878                 }
 879
 880                 if (last_monitor)
 881                         break;
 882         }
 883
 884         /* this happens if last_monitor was erroneously false */
 885         dev_kfree_skb(monskb);
 886
 887         /* ditto */
 888         if (!origskb)
 889                 return NULL;
 890
 891         return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
 892 }
 893
 894 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 895 {
 896         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 897         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 898         int tid, seqno_idx, security_idx;
 899
 900         /* does the frame have a qos control field? */
 901         if (ieee80211_is_data_qos(hdr->frame_control)) {
 902                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 903                 /* frame has qos control */
 904                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 905                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 906                         status->rx_flags |= IEEE80211_RX_AMSDU;
 907
 908                 seqno_idx = tid;
 909                 security_idx = tid;
 910         } else {
 911                 /*
 912                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 913                  *
 914                  *      Sequence numbers for management frames, QoS data
 915                  *      frames with a broadcast/multicast address in the
 916                  *      Address 1 field, and all non-QoS data frames sent
 917                  *      by QoS STAs are assigned using an additional single
 918                  *      modulo-4096 counter, [...]
 919                  *
 920                  * We also use that counter for non-QoS STAs.
 921                  */
 922                 seqno_idx = IEEE80211_NUM_TIDS;
 923                 security_idx = 0;
 924                 if (ieee80211_is_mgmt(hdr->frame_control))
 925                         security_idx = IEEE80211_NUM_TIDS;
 926                 tid = 0;
 927         }
 928
 929         rx->seqno_idx = seqno_idx;
 930         rx->security_idx = security_idx;
 931         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 932          * For now, set skb->priority to 0 for other cases. */
 933         rx->skb->priority = (tid > 7) ? 0 : tid;
 934 }
 935
 936 /**
 937  * DOC: Packet alignment
 938  *
 939  * Drivers always need to pass packets that are aligned to two-byte boundaries
 940  * to the stack.
 941  *
 942  * Additionally, should, if possible, align the payload data in a way that
 943  * guarantees that the contained IP header is aligned to a four-byte
 944  * boundary. In the case of regular frames, this simply means aligning the
 945  * payload to a four-byte boundary (because either the IP header is directly
 946  * contained, or IV/RFC1042 headers that have a length divisible by four are
 947  * in front of it).  If the payload data is not properly aligned and the
 948  * architecture doesn't support efficient unaligned operations, mac80211
 949  * will align the data.
 950  *
 951  * With A-MSDU frames, however, the payload data address must yield two modulo
 952  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 953  * push the IP header further back to a multiple of four again. Thankfully, the
 954  * specs were sane enough this time around to require padding each A-MSDU
 955  * subframe to a length that is a multiple of four.
 956  *
 957  * Padding like Atheros hardware adds which is between the 802.11 header and
 958  * the payload is not supported, the driver is required to move the 802.11
 959  * header to be directly in front of the payload in that case.
 960  */
 961 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 962 {
 963 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 964         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 965 #endif
 966 }
 967
 968
 969 /* rx handlers */
 970
 971 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 972 {
 973         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 974
 975         if (is_multicast_ether_addr(hdr->addr1))
 976                 return 0;
 977
 978         return ieee80211_is_robust_mgmt_frame(skb);
 979 }
 980
 981
 982 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 983 {
 984         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 985
 986         if (!is_multicast_ether_addr(hdr->addr1))
 987                 return 0;
 988
 989         return ieee80211_is_robust_mgmt_frame(skb);
 990 }
 991
 992
 993 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 994 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 995 {
 996         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 997         struct ieee80211_mmie *mmie;
 998         struct ieee80211_mmie_16 *mmie16;
 999
1000         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
1001                 return -1;
1002
1003         if (!ieee80211_is_robust_mgmt_frame(skb) &&
1004             !ieee80211_is_beacon(hdr->frame_control))
1005                 return -1; /* not a robust management frame */
1006
1007         mmie = (struct ieee80211_mmie *)
1008                 (skb->data + skb->len - sizeof(*mmie));
1009         if (mmie->element_id == WLAN_EID_MMIE &&
1010             mmie->length == sizeof(*mmie) - 2)
1011                 return le16_to_cpu(mmie->key_id);
1012
1013         mmie16 = (struct ieee80211_mmie_16 *)
1014                 (skb->data + skb->len - sizeof(*mmie16));
1015         if (skb->len >= 24 + sizeof(*mmie16) &&
1016             mmie16->element_id == WLAN_EID_MMIE &&
1017             mmie16->length == sizeof(*mmie16) - 2)
1018                 return le16_to_cpu(mmie16->key_id);
1019
1020         return -1;
1021 }
1022
1023 static int ieee80211_get_keyid(struct sk_buff *skb)
1024 {
1025         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1026         __le16 fc = hdr->frame_control;
1027         int hdrlen = ieee80211_hdrlen(fc);
1028         u8 keyid;
1029
1030         /* WEP, TKIP, CCMP and GCMP */
1031         if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
1032                 return -EINVAL;
1033
1034         skb_copy_bits(skb, hdrlen + 3, &keyid, 1);
1035
1036         keyid >>= 6;
1037
1038         return keyid;
1039 }
1040
1041 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1042 {
1043         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1044         char *dev_addr = rx->sdata->vif.addr;
1045
1046         if (ieee80211_is_data(hdr->frame_control)) {
1047                 if (is_multicast_ether_addr(hdr->addr1)) {
1048                         if (ieee80211_has_tods(hdr->frame_control) ||
1049                             !ieee80211_has_fromds(hdr->frame_control))
1050                                 return RX_DROP_MONITOR;
1051                         if (ether_addr_equal(hdr->addr3, dev_addr))
1052                                 return RX_DROP_MONITOR;
1053                 } else {
1054                         if (!ieee80211_has_a4(hdr->frame_control))
1055                                 return RX_DROP_MONITOR;
1056                         if (ether_addr_equal(hdr->addr4, dev_addr))
1057                                 return RX_DROP_MONITOR;
1058                 }
1059         }
1060
1061         /* If there is not an established peer link and this is not a peer link
1062          * establisment frame, beacon or probe, drop the frame.
1063          */
1064
1065         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1066                 struct ieee80211_mgmt *mgmt;
1067
1068                 if (!ieee80211_is_mgmt(hdr->frame_control))
1069                         return RX_DROP_MONITOR;
1070
1071                 if (ieee80211_is_action(hdr->frame_control)) {
1072                         u8 category;
1073
1074                         /* make sure category field is present */
1075                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1076                                 return RX_DROP_MONITOR;
1077
1078                         mgmt = (struct ieee80211_mgmt *)hdr;
1079                         category = mgmt->u.action.category;
1080                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1081                             category != WLAN_CATEGORY_SELF_PROTECTED)
1082                                 return RX_DROP_MONITOR;
1083                         return RX_CONTINUE;
1084                 }
1085
1086                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1087                     ieee80211_is_probe_resp(hdr->frame_control) ||
1088                     ieee80211_is_beacon(hdr->frame_control) ||
1089                     ieee80211_is_auth(hdr->frame_control))
1090                         return RX_CONTINUE;
1091
1092                 return RX_DROP_MONITOR;
1093         }
1094
1095         return RX_CONTINUE;
1096 }
1097
1098 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1099                                               int index)
1100 {
1101         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1102         struct sk_buff *tail = skb_peek_tail(frames);
1103         struct ieee80211_rx_status *status;
1104
1105         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1106                 return true;
1107
1108         if (!tail)
1109                 return false;
1110
1111         status = IEEE80211_SKB_RXCB(tail);
1112         if (status->flag & RX_FLAG_AMSDU_MORE)
1113                 return false;
1114
1115         return true;
1116 }
1117
1118 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1119                                             struct tid_ampdu_rx *tid_agg_rx,
1120                                             int index,
1121                                             struct sk_buff_head *frames)
1122 {
1123         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1124         struct sk_buff *skb;
1125         struct ieee80211_rx_status *status;
1126
1127         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1128
1129         if (skb_queue_empty(skb_list))
1130                 goto no_frame;
1131
1132         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1133                 __skb_queue_purge(skb_list);
1134                 goto no_frame;
1135         }
1136
1137         /* release frames from the reorder ring buffer */
1138         tid_agg_rx->stored_mpdu_num--;
1139         while ((skb = __skb_dequeue(skb_list))) {
1140                 status = IEEE80211_SKB_RXCB(skb);
1141                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1142                 __skb_queue_tail(frames, skb);
1143         }
1144
1145 no_frame:
1146         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1147         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1148 }
1149
1150 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1151                                              struct tid_ampdu_rx *tid_agg_rx,
1152                                              u16 head_seq_num,
1153                                              struct sk_buff_head *frames)
1154 {
1155         int index;
1156
1157         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1158
1159         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1160                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1161                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1162                                                 frames);
1163         }
1164 }
1165
1166 /*
1167  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1168  * the skb was added to the buffer longer than this time ago, the earlier
1169  * frames that have not yet been received are assumed to be lost and the skb
1170  * can be released for processing. This may also release other skb's from the
1171  * reorder buffer if there are no additional gaps between the frames.
1172  *
1173  * Callers must hold tid_agg_rx->reorder_lock.
1174  */
1175 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1176
1177 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1178                                           struct tid_ampdu_rx *tid_agg_rx,
1179                                           struct sk_buff_head *frames)
1180 {
1181         int index, i, j;
1182
1183         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1184
1185         /* release the buffer until next missing frame */
1186         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1187         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1188             tid_agg_rx->stored_mpdu_num) {
1189                 /*
1190                  * No buffers ready to be released, but check whether any
1191                  * frames in the reorder buffer have timed out.
1192                  */
1193                 int skipped = 1;
1194                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1195                      j = (j + 1) % tid_agg_rx->buf_size) {
1196                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1197                                 skipped++;
1198                                 continue;
1199                         }
1200                         if (skipped &&
1201                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1202                                         HT_RX_REORDER_BUF_TIMEOUT))
1203                                 goto set_release_timer;
1204
1205                         /* don't leave incomplete A-MSDUs around */
1206                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1207                              i = (i + 1) % tid_agg_rx->buf_size)
1208                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1209
1210                         ht_dbg_ratelimited(sdata,
1211                                            "release an RX reorder frame due to timeout on earlier frames\n");
1212                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1213                                                         frames);
1214
1215                         /*
1216                          * Increment the head seq# also for the skipped slots.
1217                          */
1218                         tid_agg_rx->head_seq_num =
1219                                 (tid_agg_rx->head_seq_num +
1220                                  skipped) & IEEE80211_SN_MASK;
1221                         skipped = 0;
1222                 }
1223         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1224                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1225                                                 frames);
1226                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1227         }
1228
1229         if (tid_agg_rx->stored_mpdu_num) {
1230                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1231
1232                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1233                      j = (j + 1) % tid_agg_rx->buf_size) {
1234                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1235                                 break;
1236                 }
1237
1238  set_release_timer:
1239
1240                 if (!tid_agg_rx->removed)
1241                         mod_timer(&tid_agg_rx->reorder_timer,
1242                                   tid_agg_rx->reorder_time[j] + 1 +
1243                                   HT_RX_REORDER_BUF_TIMEOUT);
1244         } else {
1245                 del_timer(&tid_agg_rx->reorder_timer);
1246         }
1247 }
1248
1249 /*
1250  * As this function belongs to the RX path it must be under
1251  * rcu_read_lock protection. It returns false if the frame
1252  * can be processed immediately, true if it was consumed.
1253  */
1254 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1255                                              struct tid_ampdu_rx *tid_agg_rx,
1256                                              struct sk_buff *skb,
1257                                              struct sk_buff_head *frames)
1258 {
1259         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1260         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1261         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1262         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1263         u16 head_seq_num, buf_size;
1264         int index;
1265         bool ret = true;
1266
1267         spin_lock(&tid_agg_rx->reorder_lock);
1268
1269         /*
1270          * Offloaded BA sessions have no known starting sequence number so pick
1271          * one from first Rxed frame for this tid after BA was started.
1272          */
1273         if (unlikely(tid_agg_rx->auto_seq)) {
1274                 tid_agg_rx->auto_seq = false;
1275                 tid_agg_rx->ssn = mpdu_seq_num;
1276                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1277         }
1278
1279         buf_size = tid_agg_rx->buf_size;
1280         head_seq_num = tid_agg_rx->head_seq_num;
1281
1282         /*
1283          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1284          * be reordered.
1285          */
1286         if (unlikely(!tid_agg_rx->started)) {
1287                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1288                         ret = false;
1289                         goto out;
1290                 }
1291                 tid_agg_rx->started = true;
1292         }
1293
1294         /* frame with out of date sequence number */
1295         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1296                 dev_kfree_skb(skb);
1297                 goto out;
1298         }
1299
1300         /*
1301          * If frame the sequence number exceeds our buffering window
1302          * size release some previous frames to make room for this one.
1303          */
1304         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1305                 head_seq_num = ieee80211_sn_inc(
1306                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1307                 /* release stored frames up to new head to stack */
1308                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1309                                                  head_seq_num, frames);
1310         }
1311
1312         /* Now the new frame is always in the range of the reordering buffer */
1313
1314         index = mpdu_seq_num % tid_agg_rx->buf_size;
1315
1316         /* check if we already stored this frame */
1317         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1318                 dev_kfree_skb(skb);
1319                 goto out;
1320         }
1321
1322         /*
1323          * If the current MPDU is in the right order and nothing else
1324          * is stored we can process it directly, no need to buffer it.
1325          * If it is first but there's something stored, we may be able
1326          * to release frames after this one.
1327          */
1328         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1329             tid_agg_rx->stored_mpdu_num == 0) {
1330                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1331                         tid_agg_rx->head_seq_num =
1332                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1333                 ret = false;
1334                 goto out;
1335         }
1336
1337         /* put the frame in the reordering buffer */
1338         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1339         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1340                 tid_agg_rx->reorder_time[index] = jiffies;
1341                 tid_agg_rx->stored_mpdu_num++;
1342                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1343         }
1344
1345  out:
1346         spin_unlock(&tid_agg_rx->reorder_lock);
1347         return ret;
1348 }
1349
1350 /*
1351  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1352  * true if the MPDU was buffered, false if it should be processed.
1353  */
1354 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1355                                        struct sk_buff_head *frames)
1356 {
1357         struct sk_buff *skb = rx->skb;
1358         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1359         struct sta_info *sta = rx->sta;
1360         struct tid_ampdu_rx *tid_agg_rx;
1361         u16 sc;
1362         u8 tid, ack_policy;
1363
1364         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1365             is_multicast_ether_addr(hdr->addr1))
1366                 goto dont_reorder;
1367
1368         /*
1369          * filter the QoS data rx stream according to
1370          * STA/TID and check if this STA/TID is on aggregation
1371          */
1372
1373         if (!sta)
1374                 goto dont_reorder;
1375
1376         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1377                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1378         tid = ieee80211_get_tid(hdr);
1379
1380         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1381         if (!tid_agg_rx) {
1382                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1383                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1384                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1385                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1386                                              WLAN_BACK_RECIPIENT,
1387                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1388                 goto dont_reorder;
1389         }
1390
1391         /* qos null data frames are excluded */
1392         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1393                 goto dont_reorder;
1394
1395         /* not part of a BA session */
1396         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1397                 goto dont_reorder;
1398
1399         /* new, potentially un-ordered, ampdu frame - process it */
1400
1401         /* reset session timer */
1402         if (tid_agg_rx->timeout)
1403                 tid_agg_rx->last_rx = jiffies;
1404
1405         /* if this mpdu is fragmented - terminate rx aggregation session */
1406         sc = le16_to_cpu(hdr->seq_ctrl);
1407         if (sc & IEEE80211_SCTL_FRAG) {
1408                 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1409                 return;
1410         }
1411
1412         /*
1413          * No locking needed -- we will only ever process one
1414          * RX packet at a time, and thus own tid_agg_rx. All
1415          * other code manipulating it needs to (and does) make
1416          * sure that we cannot get to it any more before doing
1417          * anything with it.
1418          */
1419         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1420                                              frames))
1421                 return;
1422
1423  dont_reorder:
1424         __skb_queue_tail(frames, skb);
1425 }
1426
1427 static ieee80211_rx_result debug_noinline
1428 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1429 {
1430         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1431         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1432
1433         if (status->flag & RX_FLAG_DUP_VALIDATED)
1434                 return RX_CONTINUE;
1435
1436         /*
1437          * Drop duplicate 802.11 retransmissions
1438          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1439          */
1440
1441         if (rx->skb->len < 24)
1442                 return RX_CONTINUE;
1443
1444         if (ieee80211_is_ctl(hdr->frame_control) ||
1445             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1446             is_multicast_ether_addr(hdr->addr1))
1447                 return RX_CONTINUE;
1448
1449         if (!rx->sta)
1450                 return RX_CONTINUE;
1451
1452         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1453                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1454                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1455                 rx->link_sta->rx_stats.num_duplicates++;
1456                 return RX_DROP_UNUSABLE;
1457         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1458                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1459         }
1460
1461         return RX_CONTINUE;
1462 }
1463
1464 static ieee80211_rx_result debug_noinline
1465 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1466 {
1467         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1468
1469         /* Drop disallowed frame classes based on STA auth/assoc state;
1470          * IEEE 802.11, Chap 5.5.
1471          *
1472          * mac80211 filters only based on association state, i.e. it drops
1473          * Class 3 frames from not associated stations. hostapd sends
1474          * deauth/disassoc frames when needed. In addition, hostapd is
1475          * responsible for filtering on both auth and assoc states.
1476          */
1477
1478         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1479                 return ieee80211_rx_mesh_check(rx);
1480
1481         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1482                       ieee80211_is_pspoll(hdr->frame_control)) &&
1483                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1484                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1485                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1486                 /*
1487                  * accept port control frames from the AP even when it's not
1488                  * yet marked ASSOC to prevent a race where we don't set the
1489                  * assoc bit quickly enough before it sends the first frame
1490                  */
1491                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1492                     ieee80211_is_data_present(hdr->frame_control)) {
1493                         unsigned int hdrlen;
1494                         __be16 ethertype;
1495
1496                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1497
1498                         if (rx->skb->len < hdrlen + 8)
1499                                 return RX_DROP_MONITOR;
1500
1501                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1502                         if (ethertype == rx->sdata->control_port_protocol)
1503                                 return RX_CONTINUE;
1504                 }
1505
1506                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1507                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1508                                                hdr->addr2,
1509                                                GFP_ATOMIC))
1510                         return RX_DROP_UNUSABLE;
1511
1512                 return RX_DROP_MONITOR;
1513         }
1514
1515         return RX_CONTINUE;
1516 }
1517
1518
1519 static ieee80211_rx_result debug_noinline
1520 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1521 {
1522         struct ieee80211_local *local;
1523         struct ieee80211_hdr *hdr;
1524         struct sk_buff *skb;
1525
1526         local = rx->local;
1527         skb = rx->skb;
1528         hdr = (struct ieee80211_hdr *) skb->data;
1529
1530         if (!local->pspolling)
1531                 return RX_CONTINUE;
1532
1533         if (!ieee80211_has_fromds(hdr->frame_control))
1534                 /* this is not from AP */
1535                 return RX_CONTINUE;
1536
1537         if (!ieee80211_is_data(hdr->frame_control))
1538                 return RX_CONTINUE;
1539
1540         if (!ieee80211_has_moredata(hdr->frame_control)) {
1541                 /* AP has no more frames buffered for us */
1542                 local->pspolling = false;
1543                 return RX_CONTINUE;
1544         }
1545
1546         /* more data bit is set, let's request a new frame from the AP */
1547         ieee80211_send_pspoll(local, rx->sdata);
1548
1549         return RX_CONTINUE;
1550 }
1551
1552 static void sta_ps_start(struct sta_info *sta)
1553 {
1554         struct ieee80211_sub_if_data *sdata = sta->sdata;
1555         struct ieee80211_local *local = sdata->local;
1556         struct ps_data *ps;
1557         int tid;
1558
1559         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1560             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1561                 ps = &sdata->bss->ps;
1562         else
1563                 return;
1564
1565         atomic_inc(&ps->num_sta_ps);
1566         set_sta_flag(sta, WLAN_STA_PS_STA);
1567         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1568                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1569         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1570                sta->sta.addr, sta->sta.aid);
1571
1572         ieee80211_clear_fast_xmit(sta);
1573
1574         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1575                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1576                 struct txq_info *txqi = to_txq_info(txq);
1577
1578                 spin_lock(&local->active_txq_lock[txq->ac]);
1579                 if (!list_empty(&txqi->schedule_order))
1580                         list_del_init(&txqi->schedule_order);
1581                 spin_unlock(&local->active_txq_lock[txq->ac]);
1582
1583                 if (txq_has_queue(txq))
1584                         set_bit(tid, &sta->txq_buffered_tids);
1585                 else
1586                         clear_bit(tid, &sta->txq_buffered_tids);
1587         }
1588 }
1589
1590 static void sta_ps_end(struct sta_info *sta)
1591 {
1592         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1593                sta->sta.addr, sta->sta.aid);
1594
1595         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1596                 /*
1597                  * Clear the flag only if the other one is still set
1598                  * so that the TX path won't start TX'ing new frames
1599                  * directly ... In the case that the driver flag isn't
1600                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1601                  */
1602                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1603                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1604                        sta->sta.addr, sta->sta.aid);
1605                 return;
1606         }
1607
1608         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1609         clear_sta_flag(sta, WLAN_STA_PS_STA);
1610         ieee80211_sta_ps_deliver_wakeup(sta);
1611 }
1612
1613 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1614 {
1615         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1616         bool in_ps;
1617
1618         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1619
1620         /* Don't let the same PS state be set twice */
1621         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1622         if ((start && in_ps) || (!start && !in_ps))
1623                 return -EINVAL;
1624
1625         if (start)
1626                 sta_ps_start(sta);
1627         else
1628                 sta_ps_end(sta);
1629
1630         return 0;
1631 }
1632 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1633
1634 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1635 {
1636         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1637
1638         if (test_sta_flag(sta, WLAN_STA_SP))
1639                 return;
1640
1641         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1642                 ieee80211_sta_ps_deliver_poll_response(sta);
1643         else
1644                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1645 }
1646 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1647
1648 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1649 {
1650         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1651         int ac = ieee80211_ac_from_tid(tid);
1652
1653         /*
1654          * If this AC is not trigger-enabled do nothing unless the
1655          * driver is calling us after it already checked.
1656          *
1657          * NB: This could/should check a separate bitmap of trigger-
1658          * enabled queues, but for now we only implement uAPSD w/o
1659          * TSPEC changes to the ACs, so they're always the same.
1660          */
1661         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1662             tid != IEEE80211_NUM_TIDS)
1663                 return;
1664
1665         /* if we are in a service period, do nothing */
1666         if (test_sta_flag(sta, WLAN_STA_SP))
1667                 return;
1668
1669         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1670                 ieee80211_sta_ps_deliver_uapsd(sta);
1671         else
1672                 set_sta_flag(sta, WLAN_STA_UAPSD);
1673 }
1674 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1675
1676 static ieee80211_rx_result debug_noinline
1677 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1678 {
1679         struct ieee80211_sub_if_data *sdata = rx->sdata;
1680         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1681         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1682
1683         if (!rx->sta)
1684                 return RX_CONTINUE;
1685
1686         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1687             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1688                 return RX_CONTINUE;
1689
1690         /*
1691          * The device handles station powersave, so don't do anything about
1692          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1693          * it to mac80211 since they're handled.)
1694          */
1695         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1696                 return RX_CONTINUE;
1697
1698         /*
1699          * Don't do anything if the station isn't already asleep. In
1700          * the uAPSD case, the station will probably be marked asleep,
1701          * in the PS-Poll case the station must be confused ...
1702          */
1703         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1704                 return RX_CONTINUE;
1705
1706         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1707                 ieee80211_sta_pspoll(&rx->sta->sta);
1708
1709                 /* Free PS Poll skb here instead of returning RX_DROP that would
1710                  * count as an dropped frame. */
1711                 dev_kfree_skb(rx->skb);
1712
1713                 return RX_QUEUED;
1714         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1715                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1716                    ieee80211_has_pm(hdr->frame_control) &&
1717                    (ieee80211_is_data_qos(hdr->frame_control) ||
1718                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1719                 u8 tid = ieee80211_get_tid(hdr);
1720
1721                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1722         }
1723
1724         return RX_CONTINUE;
1725 }
1726
1727 static ieee80211_rx_result debug_noinline
1728 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1729 {
1730         struct sta_info *sta = rx->sta;
1731         struct link_sta_info *link_sta = rx->link_sta;
1732         struct sk_buff *skb = rx->skb;
1733         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1734         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1735         int i;
1736
1737         if (!sta || !link_sta)
1738                 return RX_CONTINUE;
1739
1740         /*
1741          * Update last_rx only for IBSS packets which are for the current
1742          * BSSID and for station already AUTHORIZED to avoid keeping the
1743          * current IBSS network alive in cases where other STAs start
1744          * using different BSSID. This will also give the station another
1745          * chance to restart the authentication/authorization in case
1746          * something went wrong the first time.
1747          */
1748         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1749                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1750                                                 NL80211_IFTYPE_ADHOC);
1751                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1752                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1753                         link_sta->rx_stats.last_rx = jiffies;
1754                         if (ieee80211_is_data(hdr->frame_control) &&
1755                             !is_multicast_ether_addr(hdr->addr1))
1756                                 link_sta->rx_stats.last_rate =
1757                                         sta_stats_encode_rate(status);
1758                 }
1759         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1760                 link_sta->rx_stats.last_rx = jiffies;
1761         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1762                    !is_multicast_ether_addr(hdr->addr1)) {
1763                 /*
1764                  * Mesh beacons will update last_rx when if they are found to
1765                  * match the current local configuration when processed.
1766                  */
1767                 link_sta->rx_stats.last_rx = jiffies;
1768                 if (ieee80211_is_data(hdr->frame_control))
1769                         link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1770         }
1771
1772         link_sta->rx_stats.fragments++;
1773
1774         u64_stats_update_begin(&link_sta->rx_stats.syncp);
1775         link_sta->rx_stats.bytes += rx->skb->len;
1776         u64_stats_update_end(&link_sta->rx_stats.syncp);
1777
1778         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1779                 link_sta->rx_stats.last_signal = status->signal;
1780                 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1781                                 -status->signal);
1782         }
1783
1784         if (status->chains) {
1785                 link_sta->rx_stats.chains = status->chains;
1786                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1787                         int signal = status->chain_signal[i];
1788
1789                         if (!(status->chains & BIT(i)))
1790                                 continue;
1791
1792                         link_sta->rx_stats.chain_signal_last[i] = signal;
1793                         ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1794                                         -signal);
1795                 }
1796         }
1797
1798         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1799                 return RX_CONTINUE;
1800
1801         /*
1802          * Change STA power saving mode only at the end of a frame
1803          * exchange sequence, and only for a data or management
1804          * frame as specified in IEEE 802.11-2016 11.2.3.2
1805          */
1806         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1807             !ieee80211_has_morefrags(hdr->frame_control) &&
1808             !is_multicast_ether_addr(hdr->addr1) &&
1809             (ieee80211_is_mgmt(hdr->frame_control) ||
1810              ieee80211_is_data(hdr->frame_control)) &&
1811             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1812             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1813              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1814                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1815                         if (!ieee80211_has_pm(hdr->frame_control))
1816                                 sta_ps_end(sta);
1817                 } else {
1818                         if (ieee80211_has_pm(hdr->frame_control))
1819                                 sta_ps_start(sta);
1820                 }
1821         }
1822
1823         /* mesh power save support */
1824         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1825                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1826
1827         /*
1828          * Drop (qos-)data::nullfunc frames silently, since they
1829          * are used only to control station power saving mode.
1830          */
1831         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1832                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1833
1834                 /*
1835                  * If we receive a 4-addr nullfunc frame from a STA
1836                  * that was not moved to a 4-addr STA vlan yet send
1837                  * the event to userspace and for older hostapd drop
1838                  * the frame to the monitor interface.
1839                  */
1840                 if (ieee80211_has_a4(hdr->frame_control) &&
1841                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1842                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1843                       !rx->sdata->u.vlan.sta))) {
1844                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1845                                 cfg80211_rx_unexpected_4addr_frame(
1846                                         rx->sdata->dev, sta->sta.addr,
1847                                         GFP_ATOMIC);
1848                         return RX_DROP_MONITOR;
1849                 }
1850                 /*
1851                  * Update counter and free packet here to avoid
1852                  * counting this as a dropped packed.
1853                  */
1854                 link_sta->rx_stats.packets++;
1855                 dev_kfree_skb(rx->skb);
1856                 return RX_QUEUED;
1857         }
1858
1859         return RX_CONTINUE;
1860 } /* ieee80211_rx_h_sta_process */
1861
1862 static struct ieee80211_key *
1863 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1864 {
1865         struct ieee80211_key *key = NULL;
1866         int idx2;
1867
1868         /* Make sure key gets set if either BIGTK key index is set so that
1869          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1870          * Beacon frames and Beacon frames that claim to use another BIGTK key
1871          * index (i.e., a key that we do not have).
1872          */
1873
1874         if (idx < 0) {
1875                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1876                 idx2 = idx + 1;
1877         } else {
1878                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1879                         idx2 = idx + 1;
1880                 else
1881                         idx2 = idx - 1;
1882         }
1883
1884         if (rx->link_sta)
1885                 key = rcu_dereference(rx->link_sta->gtk[idx]);
1886         if (!key)
1887                 key = rcu_dereference(rx->link->gtk[idx]);
1888         if (!key && rx->link_sta)
1889                 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1890         if (!key)
1891                 key = rcu_dereference(rx->link->gtk[idx2]);
1892
1893         return key;
1894 }
1895
1896 static ieee80211_rx_result debug_noinline
1897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1898 {
1899         struct sk_buff *skb = rx->skb;
1900         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1901         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1902         int keyidx;
1903         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1904         struct ieee80211_key *sta_ptk = NULL;
1905         struct ieee80211_key *ptk_idx = NULL;
1906         int mmie_keyidx = -1;
1907         __le16 fc;
1908
1909         if (ieee80211_is_ext(hdr->frame_control))
1910                 return RX_CONTINUE;
1911
1912         /*
1913          * Key selection 101
1914          *
1915          * There are five types of keys:
1916          *  - GTK (group keys)
1917          *  - IGTK (group keys for management frames)
1918          *  - BIGTK (group keys for Beacon frames)
1919          *  - PTK (pairwise keys)
1920          *  - STK (station-to-station pairwise keys)
1921          *
1922          * When selecting a key, we have to distinguish between multicast
1923          * (including broadcast) and unicast frames, the latter can only
1924          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1925          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1926          * then unicast frames can also use key indices like GTKs. Hence, if we
1927          * don't have a PTK/STK we check the key index for a WEP key.
1928          *
1929          * Note that in a regular BSS, multicast frames are sent by the
1930          * AP only, associated stations unicast the frame to the AP first
1931          * which then multicasts it on their behalf.
1932          *
1933          * There is also a slight problem in IBSS mode: GTKs are negotiated
1934          * with each station, that is something we don't currently handle.
1935          * The spec seems to expect that one negotiates the same key with
1936          * every station but there's no such requirement; VLANs could be
1937          * possible.
1938          */
1939
1940         /* start without a key */
1941         rx->key = NULL;
1942         fc = hdr->frame_control;
1943
1944         if (rx->sta) {
1945                 int keyid = rx->sta->ptk_idx;
1946                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1947
1948                 if (ieee80211_has_protected(fc) &&
1949                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1950                         keyid = ieee80211_get_keyid(rx->skb);
1951
1952                         if (unlikely(keyid < 0))
1953                                 return RX_DROP_UNUSABLE;
1954
1955                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1956                 }
1957         }
1958
1959         if (!ieee80211_has_protected(fc))
1960                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1961
1962         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1963                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1964                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1965                     (status->flag & RX_FLAG_IV_STRIPPED))
1966                         return RX_CONTINUE;
1967                 /* Skip decryption if the frame is not protected. */
1968                 if (!ieee80211_has_protected(fc))
1969                         return RX_CONTINUE;
1970         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1971                 /* Broadcast/multicast robust management frame / BIP */
1972                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1973                     (status->flag & RX_FLAG_IV_STRIPPED))
1974                         return RX_CONTINUE;
1975
1976                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1977                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1978                                    NUM_DEFAULT_BEACON_KEYS) {
1979                         if (rx->sdata->dev)
1980                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1981                                                              skb->data,
1982                                                              skb->len);
1983                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1984                 }
1985
1986                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1987                 if (!rx->key)
1988                         return RX_CONTINUE; /* Beacon protection not in use */
1989         } else if (mmie_keyidx >= 0) {
1990                 /* Broadcast/multicast robust management frame / BIP */
1991                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1992                     (status->flag & RX_FLAG_IV_STRIPPED))
1993                         return RX_CONTINUE;
1994
1995                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1996                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1997                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1998                 if (rx->link_sta) {
1999                         if (ieee80211_is_group_privacy_action(skb) &&
2000                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2001                                 return RX_DROP_MONITOR;
2002
2003                         rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
2004                 }
2005                 if (!rx->key)
2006                         rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
2007         } else if (!ieee80211_has_protected(fc)) {
2008                 /*
2009                  * The frame was not protected, so skip decryption. However, we
2010                  * need to set rx->key if there is a key that could have been
2011                  * used so that the frame may be dropped if encryption would
2012                  * have been expected.
2013                  */
2014                 struct ieee80211_key *key = NULL;
2015                 int i;
2016
2017                 if (ieee80211_is_beacon(fc)) {
2018                         key = ieee80211_rx_get_bigtk(rx, -1);
2019                 } else if (ieee80211_is_mgmt(fc) &&
2020                            is_multicast_ether_addr(hdr->addr1)) {
2021                         key = rcu_dereference(rx->link->default_mgmt_key);
2022                 } else {
2023                         if (rx->link_sta) {
2024                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2025                                         key = rcu_dereference(rx->link_sta->gtk[i]);
2026                                         if (key)
2027                                                 break;
2028                                 }
2029                         }
2030                         if (!key) {
2031                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2032                                         key = rcu_dereference(rx->link->gtk[i]);
2033                                         if (key)
2034                                                 break;
2035                                 }
2036                         }
2037                 }
2038                 if (key)
2039                         rx->key = key;
2040                 return RX_CONTINUE;
2041         } else {
2042                 /*
2043                  * The device doesn't give us the IV so we won't be
2044                  * able to look up the key. That's ok though, we
2045                  * don't need to decrypt the frame, we just won't
2046                  * be able to keep statistics accurate.
2047                  * Except for key threshold notifications, should
2048                  * we somehow allow the driver to tell us which key
2049                  * the hardware used if this flag is set?
2050                  */
2051                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2052                     (status->flag & RX_FLAG_IV_STRIPPED))
2053                         return RX_CONTINUE;
2054
2055                 keyidx = ieee80211_get_keyid(rx->skb);
2056
2057                 if (unlikely(keyidx < 0))
2058                         return RX_DROP_UNUSABLE;
2059
2060                 /* check per-station GTK first, if multicast packet */
2061                 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2062                         rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2063
2064                 /* if not found, try default key */
2065                 if (!rx->key) {
2066                         if (is_multicast_ether_addr(hdr->addr1))
2067                                 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2068                         if (!rx->key)
2069                                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2070
2071                         /*
2072                          * RSNA-protected unicast frames should always be
2073                          * sent with pairwise or station-to-station keys,
2074                          * but for WEP we allow using a key index as well.
2075                          */
2076                         if (rx->key &&
2077                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2078                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2079                             !is_multicast_ether_addr(hdr->addr1))
2080                                 rx->key = NULL;
2081                 }
2082         }
2083
2084         if (rx->key) {
2085                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2086                         return RX_DROP_MONITOR;
2087
2088                 /* TODO: add threshold stuff again */
2089         } else {
2090                 return RX_DROP_MONITOR;
2091         }
2092
2093         switch (rx->key->conf.cipher) {
2094         case WLAN_CIPHER_SUITE_WEP40:
2095         case WLAN_CIPHER_SUITE_WEP104:
2096                 result = ieee80211_crypto_wep_decrypt(rx);
2097                 break;
2098         case WLAN_CIPHER_SUITE_TKIP:
2099                 result = ieee80211_crypto_tkip_decrypt(rx);
2100                 break;
2101         case WLAN_CIPHER_SUITE_CCMP:
2102                 result = ieee80211_crypto_ccmp_decrypt(
2103                         rx, IEEE80211_CCMP_MIC_LEN);
2104                 break;
2105         case WLAN_CIPHER_SUITE_CCMP_256:
2106                 result = ieee80211_crypto_ccmp_decrypt(
2107                         rx, IEEE80211_CCMP_256_MIC_LEN);
2108                 break;
2109         case WLAN_CIPHER_SUITE_AES_CMAC:
2110                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2111                 break;
2112         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2113                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2114                 break;
2115         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2116         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2117                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2118                 break;
2119         case WLAN_CIPHER_SUITE_GCMP:
2120         case WLAN_CIPHER_SUITE_GCMP_256:
2121                 result = ieee80211_crypto_gcmp_decrypt(rx);
2122                 break;
2123         default:
2124                 result = RX_DROP_UNUSABLE;
2125         }
2126
2127         /* the hdr variable is invalid after the decrypt handlers */
2128
2129         /* either the frame has been decrypted or will be dropped */
2130         status->flag |= RX_FLAG_DECRYPTED;
2131
2132         if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
2133                      rx->sdata->dev))
2134                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2135                                              skb->data, skb->len);
2136
2137         return result;
2138 }
2139
2140 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2141 {
2142         int i;
2143
2144         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2145                 skb_queue_head_init(&cache->entries[i].skb_list);
2146 }
2147
2148 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2149 {
2150         int i;
2151
2152         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2153                 __skb_queue_purge(&cache->entries[i].skb_list);
2154 }
2155
2156 static inline struct ieee80211_fragment_entry *
2157 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2158                          unsigned int frag, unsigned int seq, int rx_queue,
2159                          struct sk_buff **skb)
2160 {
2161         struct ieee80211_fragment_entry *entry;
2162
2163         entry = &cache->entries[cache->next++];
2164         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2165                 cache->next = 0;
2166
2167         __skb_queue_purge(&entry->skb_list);
2168
2169         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2170         *skb = NULL;
2171         entry->first_frag_time = jiffies;
2172         entry->seq = seq;
2173         entry->rx_queue = rx_queue;
2174         entry->last_frag = frag;
2175         entry->check_sequential_pn = false;
2176         entry->extra_len = 0;
2177
2178         return entry;
2179 }
2180
2181 static inline struct ieee80211_fragment_entry *
2182 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2183                           unsigned int frag, unsigned int seq,
2184                           int rx_queue, struct ieee80211_hdr *hdr)
2185 {
2186         struct ieee80211_fragment_entry *entry;
2187         int i, idx;
2188
2189         idx = cache->next;
2190         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2191                 struct ieee80211_hdr *f_hdr;
2192                 struct sk_buff *f_skb;
2193
2194                 idx--;
2195                 if (idx < 0)
2196                         idx = IEEE80211_FRAGMENT_MAX - 1;
2197
2198                 entry = &cache->entries[idx];
2199                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2200                     entry->rx_queue != rx_queue ||
2201                     entry->last_frag + 1 != frag)
2202                         continue;
2203
2204                 f_skb = __skb_peek(&entry->skb_list);
2205                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2206
2207                 /*
2208                  * Check ftype and addresses are equal, else check next fragment
2209                  */
2210                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2211                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2212                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2213                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2214                         continue;
2215
2216                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2217                         __skb_queue_purge(&entry->skb_list);
2218                         continue;
2219                 }
2220                 return entry;
2221         }
2222
2223         return NULL;
2224 }
2225
2226 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2227 {
2228         return rx->key &&
2229                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2230                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2231                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2232                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2233                 ieee80211_has_protected(fc);
2234 }
2235
2236 static ieee80211_rx_result debug_noinline
2237 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2238 {
2239         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2240         struct ieee80211_hdr *hdr;
2241         u16 sc;
2242         __le16 fc;
2243         unsigned int frag, seq;
2244         struct ieee80211_fragment_entry *entry;
2245         struct sk_buff *skb;
2246         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2247
2248         hdr = (struct ieee80211_hdr *)rx->skb->data;
2249         fc = hdr->frame_control;
2250
2251         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2252                 return RX_CONTINUE;
2253
2254         sc = le16_to_cpu(hdr->seq_ctrl);
2255         frag = sc & IEEE80211_SCTL_FRAG;
2256
2257         if (rx->sta)
2258                 cache = &rx->sta->frags;
2259
2260         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2261                 goto out;
2262
2263         if (is_multicast_ether_addr(hdr->addr1))
2264                 return RX_DROP_MONITOR;
2265
2266         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2267
2268         if (skb_linearize(rx->skb))
2269                 return RX_DROP_UNUSABLE;
2270
2271         /*
2272          *  skb_linearize() might change the skb->data and
2273          *  previously cached variables (in this case, hdr) need to
2274          *  be refreshed with the new data.
2275          */
2276         hdr = (struct ieee80211_hdr *)rx->skb->data;
2277         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2278
2279         if (frag == 0) {
2280                 /* This is the first fragment of a new frame. */
2281                 entry = ieee80211_reassemble_add(cache, frag, seq,
2282                                                  rx->seqno_idx, &(rx->skb));
2283                 if (requires_sequential_pn(rx, fc)) {
2284                         int queue = rx->security_idx;
2285
2286                         /* Store CCMP/GCMP PN so that we can verify that the
2287                          * next fragment has a sequential PN value.
2288                          */
2289                         entry->check_sequential_pn = true;
2290                         entry->is_protected = true;
2291                         entry->key_color = rx->key->color;
2292                         memcpy(entry->last_pn,
2293                                rx->key->u.ccmp.rx_pn[queue],
2294                                IEEE80211_CCMP_PN_LEN);
2295                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2296                                               u.ccmp.rx_pn) !=
2297                                      offsetof(struct ieee80211_key,
2298                                               u.gcmp.rx_pn));
2299                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2300                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2301                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2302                                      IEEE80211_GCMP_PN_LEN);
2303                 } else if (rx->key &&
2304                            (ieee80211_has_protected(fc) ||
2305                             (status->flag & RX_FLAG_DECRYPTED))) {
2306                         entry->is_protected = true;
2307                         entry->key_color = rx->key->color;
2308                 }
2309                 return RX_QUEUED;
2310         }
2311
2312         /* This is a fragment for a frame that should already be pending in
2313          * fragment cache. Add this fragment to the end of the pending entry.
2314          */
2315         entry = ieee80211_reassemble_find(cache, frag, seq,
2316                                           rx->seqno_idx, hdr);
2317         if (!entry) {
2318                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2319                 return RX_DROP_MONITOR;
2320         }
2321
2322         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2323          *  MPDU PN values are not incrementing in steps of 1."
2324          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2325          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2326          */
2327         if (entry->check_sequential_pn) {
2328                 int i;
2329                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2330
2331                 if (!requires_sequential_pn(rx, fc))
2332                         return RX_DROP_UNUSABLE;
2333
2334                 /* Prevent mixed key and fragment cache attacks */
2335                 if (entry->key_color != rx->key->color)
2336                         return RX_DROP_UNUSABLE;
2337
2338                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2339                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2340                         pn[i]++;
2341                         if (pn[i])
2342                                 break;
2343                 }
2344
2345                 rpn = rx->ccm_gcm.pn;
2346                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2347                         return RX_DROP_UNUSABLE;
2348                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2349         } else if (entry->is_protected &&
2350                    (!rx->key ||
2351                     (!ieee80211_has_protected(fc) &&
2352                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2353                     rx->key->color != entry->key_color)) {
2354                 /* Drop this as a mixed key or fragment cache attack, even
2355                  * if for TKIP Michael MIC should protect us, and WEP is a
2356                  * lost cause anyway.
2357                  */
2358                 return RX_DROP_UNUSABLE;
2359         } else if (entry->is_protected && rx->key &&
2360                    entry->key_color != rx->key->color &&
2361                    (status->flag & RX_FLAG_DECRYPTED)) {
2362                 return RX_DROP_UNUSABLE;
2363         }
2364
2365         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2366         __skb_queue_tail(&entry->skb_list, rx->skb);
2367         entry->last_frag = frag;
2368         entry->extra_len += rx->skb->len;
2369         if (ieee80211_has_morefrags(fc)) {
2370                 rx->skb = NULL;
2371                 return RX_QUEUED;
2372         }
2373
2374         rx->skb = __skb_dequeue(&entry->skb_list);
2375         if (skb_tailroom(rx->skb) < entry->extra_len) {
2376                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2377                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2378                                               GFP_ATOMIC))) {
2379                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2380                         __skb_queue_purge(&entry->skb_list);
2381                         return RX_DROP_UNUSABLE;
2382                 }
2383         }
2384         while ((skb = __skb_dequeue(&entry->skb_list))) {
2385                 skb_put_data(rx->skb, skb->data, skb->len);
2386                 dev_kfree_skb(skb);
2387         }
2388
2389  out:
2390         ieee80211_led_rx(rx->local);
2391         if (rx->sta)
2392                 rx->link_sta->rx_stats.packets++;
2393         return RX_CONTINUE;
2394 }
2395
2396 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2397 {
2398         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2399                 return -EACCES;
2400
2401         return 0;
2402 }
2403
2404 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2405 {
2406         struct sk_buff *skb = rx->skb;
2407         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2408
2409         /*
2410          * Pass through unencrypted frames if the hardware has
2411          * decrypted them already.
2412          */
2413         if (status->flag & RX_FLAG_DECRYPTED)
2414                 return 0;
2415
2416         /* Drop unencrypted frames if key is set. */
2417         if (unlikely(!ieee80211_has_protected(fc) &&
2418                      !ieee80211_is_any_nullfunc(fc) &&
2419                      ieee80211_is_data(fc) && rx->key))
2420                 return -EACCES;
2421
2422         return 0;
2423 }
2424
2425 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2426 {
2427         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2428         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2429         __le16 fc = hdr->frame_control;
2430
2431         /*
2432          * Pass through unencrypted frames if the hardware has
2433          * decrypted them already.
2434          */
2435         if (status->flag & RX_FLAG_DECRYPTED)
2436                 return 0;
2437
2438         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2439                 if (unlikely(!ieee80211_has_protected(fc) &&
2440                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2441                              rx->key)) {
2442                         if (ieee80211_is_deauth(fc) ||
2443                             ieee80211_is_disassoc(fc))
2444                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2445                                                              rx->skb->data,
2446                                                              rx->skb->len);
2447                         return -EACCES;
2448                 }
2449                 /* BIP does not use Protected field, so need to check MMIE */
2450                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2451                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2452                         if (ieee80211_is_deauth(fc) ||
2453                             ieee80211_is_disassoc(fc))
2454                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2455                                                              rx->skb->data,
2456                                                              rx->skb->len);
2457                         return -EACCES;
2458                 }
2459                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2460                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2461                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2462                                                      rx->skb->data,
2463                                                      rx->skb->len);
2464                         return -EACCES;
2465                 }
2466                 /*
2467                  * When using MFP, Action frames are not allowed prior to
2468                  * having configured keys.
2469                  */
2470                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2471                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2472                         return -EACCES;
2473         }
2474
2475         return 0;
2476 }
2477
2478 static int
2479 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2480 {
2481         struct ieee80211_sub_if_data *sdata = rx->sdata;
2482         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2483         bool check_port_control = false;
2484         struct ethhdr *ehdr;
2485         int ret;
2486
2487         *port_control = false;
2488         if (ieee80211_has_a4(hdr->frame_control) &&
2489             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2490                 return -1;
2491
2492         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2493             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2494
2495                 if (!sdata->u.mgd.use_4addr)
2496                         return -1;
2497                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2498                         check_port_control = true;
2499         }
2500
2501         if (is_multicast_ether_addr(hdr->addr1) &&
2502             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2503                 return -1;
2504
2505         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2506         if (ret < 0)
2507                 return ret;
2508
2509         ehdr = (struct ethhdr *) rx->skb->data;
2510         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2511                 *port_control = true;
2512         else if (check_port_control)
2513                 return -1;
2514
2515         return 0;
2516 }
2517
2518 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2519                            const u8 *addr, int *out_link_id)
2520 {
2521         unsigned int link_id;
2522
2523         /* non-MLO, or MLD address replaced by hardware */
2524         if (ether_addr_equal(sdata->vif.addr, addr))
2525                 return true;
2526
2527         if (!sdata->vif.valid_links)
2528                 return false;
2529
2530         for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2531                 struct ieee80211_bss_conf *conf;
2532
2533                 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2534
2535                 if (!conf)
2536                         continue;
2537                 if (ether_addr_equal(conf->addr, addr)) {
2538                         if (out_link_id)
2539                                 *out_link_id = link_id;
2540                         return true;
2541                 }
2542         }
2543
2544         return false;
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 ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
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->link_sta->rx_stats.syncp);
2643                 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2644                 u64_stats_update_end(&rx->link_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                 int offset = hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2871                              sizeof(rfc1042_header);
2872                 __be16 ethertype;
2873
2874                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr) ||
2875                     skb_copy_bits(rx->skb, offset, &ethertype, 2) != 0 ||
2876                     ethertype != rx->sdata->control_port_protocol)
2877                         return RX_DROP_MONITOR;
2878         }
2879
2880         /* frame is in RMC, don't forward */
2881         if (ieee80211_is_data(hdr->frame_control) &&
2882             is_multicast_ether_addr(hdr->addr1) &&
2883             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2884                 return RX_DROP_MONITOR;
2885
2886         if (!ieee80211_is_data(hdr->frame_control))
2887                 return RX_CONTINUE;
2888
2889         if (!mesh_hdr->ttl)
2890                 return RX_DROP_MONITOR;
2891
2892         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2893                 struct mesh_path *mppath;
2894                 char *proxied_addr;
2895                 char *mpp_addr;
2896
2897                 if (is_multicast_ether_addr(hdr->addr1)) {
2898                         mpp_addr = hdr->addr3;
2899                         proxied_addr = mesh_hdr->eaddr1;
2900                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2901                             MESH_FLAGS_AE_A5_A6) {
2902                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2903                         mpp_addr = hdr->addr4;
2904                         proxied_addr = mesh_hdr->eaddr2;
2905                 } else {
2906                         return RX_DROP_MONITOR;
2907                 }
2908
2909                 rcu_read_lock();
2910                 mppath = mpp_path_lookup(sdata, proxied_addr);
2911                 if (!mppath) {
2912                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2913                 } else {
2914                         spin_lock_bh(&mppath->state_lock);
2915                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2916                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2917                         mppath->exp_time = jiffies;
2918                         spin_unlock_bh(&mppath->state_lock);
2919                 }
2920                 rcu_read_unlock();
2921         }
2922
2923         /* Frame has reached destination.  Don't forward */
2924         if (!is_multicast_ether_addr(hdr->addr1) &&
2925             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2926                 return RX_CONTINUE;
2927
2928         ac = ieee802_1d_to_ac[skb->priority];
2929         q = sdata->vif.hw_queue[ac];
2930         if (ieee80211_queue_stopped(&local->hw, q)) {
2931                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2932                 return RX_DROP_MONITOR;
2933         }
2934         skb_set_queue_mapping(skb, ac);
2935
2936         if (!--mesh_hdr->ttl) {
2937                 if (!is_multicast_ether_addr(hdr->addr1))
2938                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2939                                                      dropped_frames_ttl);
2940                 goto out;
2941         }
2942
2943         if (!ifmsh->mshcfg.dot11MeshForwarding)
2944                 goto out;
2945
2946         if (sdata->crypto_tx_tailroom_needed_cnt)
2947                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2948
2949         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2950                                        IEEE80211_ENCRYPT_HEADROOM,
2951                                   tailroom, GFP_ATOMIC);
2952         if (!fwd_skb)
2953                 goto out;
2954
2955         fwd_skb->dev = sdata->dev;
2956         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2957         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2958         info = IEEE80211_SKB_CB(fwd_skb);
2959         memset(info, 0, sizeof(*info));
2960         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2961         info->control.vif = &rx->sdata->vif;
2962         info->control.jiffies = jiffies;
2963         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2964                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2965                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2966                 /* update power mode indication when forwarding */
2967                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2968         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2969                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2970                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2971         } else {
2972                 /* unable to resolve next hop */
2973                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2974                                    fwd_hdr->addr3, 0,
2975                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2976                                    fwd_hdr->addr2);
2977                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2978                 kfree_skb(fwd_skb);
2979                 return RX_DROP_MONITOR;
2980         }
2981
2982         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2983         ieee80211_add_pending_skb(local, fwd_skb);
2984  out:
2985         if (is_multicast_ether_addr(hdr->addr1))
2986                 return RX_CONTINUE;
2987         return RX_DROP_MONITOR;
2988 }
2989 #endif
2990
2991 static ieee80211_rx_result debug_noinline
2992 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2993 {
2994         struct ieee80211_sub_if_data *sdata = rx->sdata;
2995         struct ieee80211_local *local = rx->local;
2996         struct net_device *dev = sdata->dev;
2997         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2998         __le16 fc = hdr->frame_control;
2999         bool port_control;
3000         int err;
3001
3002         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3003                 return RX_CONTINUE;
3004
3005         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3006                 return RX_DROP_MONITOR;
3007
3008         /*
3009          * Send unexpected-4addr-frame event to hostapd. For older versions,
3010          * also drop the frame to cooked monitor interfaces.
3011          */
3012         if (ieee80211_has_a4(hdr->frame_control) &&
3013             sdata->vif.type == NL80211_IFTYPE_AP) {
3014                 if (rx->sta &&
3015                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3016                         cfg80211_rx_unexpected_4addr_frame(
3017                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3018                 return RX_DROP_MONITOR;
3019         }
3020
3021         err = __ieee80211_data_to_8023(rx, &port_control);
3022         if (unlikely(err))
3023                 return RX_DROP_UNUSABLE;
3024
3025         if (!ieee80211_frame_allowed(rx, fc))
3026                 return RX_DROP_MONITOR;
3027
3028         /* directly handle TDLS channel switch requests/responses */
3029         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3030                                                 cpu_to_be16(ETH_P_TDLS))) {
3031                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3032
3033                 if (pskb_may_pull(rx->skb,
3034                                   offsetof(struct ieee80211_tdls_data, u)) &&
3035                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3036                     tf->category == WLAN_CATEGORY_TDLS &&
3037                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3038                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3039                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3040                         __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3041                                                        rx->sta, rx->skb);
3042                         return RX_QUEUED;
3043                 }
3044         }
3045
3046         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3047             unlikely(port_control) && sdata->bss) {
3048                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3049                                      u.ap);
3050                 dev = sdata->dev;
3051                 rx->sdata = sdata;
3052         }
3053
3054         rx->skb->dev = dev;
3055
3056         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3057             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3058             !is_multicast_ether_addr(
3059                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3060             (!local->scanning &&
3061              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3062                 mod_timer(&local->dynamic_ps_timer, jiffies +
3063                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3064
3065         ieee80211_deliver_skb(rx);
3066
3067         return RX_QUEUED;
3068 }
3069
3070 static ieee80211_rx_result debug_noinline
3071 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3072 {
3073         struct sk_buff *skb = rx->skb;
3074         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3075         struct tid_ampdu_rx *tid_agg_rx;
3076         u16 start_seq_num;
3077         u16 tid;
3078
3079         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3080                 return RX_CONTINUE;
3081
3082         if (ieee80211_is_back_req(bar->frame_control)) {
3083                 struct {
3084                         __le16 control, start_seq_num;
3085                 } __packed bar_data;
3086                 struct ieee80211_event event = {
3087                         .type = BAR_RX_EVENT,
3088                 };
3089
3090                 if (!rx->sta)
3091                         return RX_DROP_MONITOR;
3092
3093                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3094                                   &bar_data, sizeof(bar_data)))
3095                         return RX_DROP_MONITOR;
3096
3097                 tid = le16_to_cpu(bar_data.control) >> 12;
3098
3099                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3100                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3101                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3102                                              WLAN_BACK_RECIPIENT,
3103                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3104
3105                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3106                 if (!tid_agg_rx)
3107                         return RX_DROP_MONITOR;
3108
3109                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3110                 event.u.ba.tid = tid;
3111                 event.u.ba.ssn = start_seq_num;
3112                 event.u.ba.sta = &rx->sta->sta;
3113
3114                 /* reset session timer */
3115                 if (tid_agg_rx->timeout)
3116                         mod_timer(&tid_agg_rx->session_timer,
3117                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3118
3119                 spin_lock(&tid_agg_rx->reorder_lock);
3120                 /* release stored frames up to start of BAR */
3121                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3122                                                  start_seq_num, frames);
3123                 spin_unlock(&tid_agg_rx->reorder_lock);
3124
3125                 drv_event_callback(rx->local, rx->sdata, &event);
3126
3127                 kfree_skb(skb);
3128                 return RX_QUEUED;
3129         }
3130
3131         /*
3132          * After this point, we only want management frames,
3133          * so we can drop all remaining control frames to
3134          * cooked monitor interfaces.
3135          */
3136         return RX_DROP_MONITOR;
3137 }
3138
3139 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3140                                            struct ieee80211_mgmt *mgmt,
3141                                            size_t len)
3142 {
3143         struct ieee80211_local *local = sdata->local;
3144         struct sk_buff *skb;
3145         struct ieee80211_mgmt *resp;
3146
3147         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3148                 /* Not to own unicast address */
3149                 return;
3150         }
3151
3152         if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3153             !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3154                 /* Not from the current AP or not associated yet. */
3155                 return;
3156         }
3157
3158         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3159                 /* Too short SA Query request frame */
3160                 return;
3161         }
3162
3163         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3164         if (skb == NULL)
3165                 return;
3166
3167         skb_reserve(skb, local->hw.extra_tx_headroom);
3168         resp = skb_put_zero(skb, 24);
3169         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3170         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3171         memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3172         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3173                                           IEEE80211_STYPE_ACTION);
3174         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3175         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3176         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3177         memcpy(resp->u.action.u.sa_query.trans_id,
3178                mgmt->u.action.u.sa_query.trans_id,
3179                WLAN_SA_QUERY_TR_ID_LEN);
3180
3181         ieee80211_tx_skb(sdata, skb);
3182 }
3183
3184 static void
3185 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3186 {
3187         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3188         const struct element *ie;
3189         size_t baselen;
3190
3191         if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3192                                      NL80211_EXT_FEATURE_BSS_COLOR))
3193                 return;
3194
3195         if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3196                 return;
3197
3198         if (rx->sdata->vif.bss_conf.csa_active)
3199                 return;
3200
3201         baselen = mgmt->u.beacon.variable - rx->skb->data;
3202         if (baselen > rx->skb->len)
3203                 return;
3204
3205         ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3206                                     mgmt->u.beacon.variable,
3207                                     rx->skb->len - baselen);
3208         if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3209             ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3210                 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3211                 const struct ieee80211_he_operation *he_oper;
3212                 u8 color;
3213
3214                 he_oper = (void *)(ie->data + 1);
3215                 if (le32_get_bits(he_oper->he_oper_params,
3216                                   IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3217                         return;
3218
3219                 color = le32_get_bits(he_oper->he_oper_params,
3220                                       IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3221                 if (color == bss_conf->he_bss_color.color)
3222                         ieeee80211_obss_color_collision_notify(&rx->sdata->vif,
3223                                                                BIT_ULL(color),
3224                                                                GFP_ATOMIC);
3225         }
3226 }
3227
3228 static ieee80211_rx_result debug_noinline
3229 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3230 {
3231         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3232         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3233
3234         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3235                 return RX_CONTINUE;
3236
3237         /*
3238          * From here on, look only at management frames.
3239          * Data and control frames are already handled,
3240          * and unknown (reserved) frames are useless.
3241          */
3242         if (rx->skb->len < 24)
3243                 return RX_DROP_MONITOR;
3244
3245         if (!ieee80211_is_mgmt(mgmt->frame_control))
3246                 return RX_DROP_MONITOR;
3247
3248         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3249             ieee80211_is_beacon(mgmt->frame_control) &&
3250             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3251                 int sig = 0;
3252
3253                 /* sw bss color collision detection */
3254                 ieee80211_rx_check_bss_color_collision(rx);
3255
3256                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3257                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3258                         sig = status->signal;
3259
3260                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3261                                                 rx->skb->data, rx->skb->len,
3262                                                 ieee80211_rx_status_to_khz(status),
3263                                                 sig);
3264                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3265         }
3266
3267         if (ieee80211_drop_unencrypted_mgmt(rx))
3268                 return RX_DROP_UNUSABLE;
3269
3270         return RX_CONTINUE;
3271 }
3272
3273 static bool
3274 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3275 {
3276         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3277         struct ieee80211_sub_if_data *sdata = rx->sdata;
3278
3279         /* TWT actions are only supported in AP for the moment */
3280         if (sdata->vif.type != NL80211_IFTYPE_AP)
3281                 return false;
3282
3283         if (!rx->local->ops->add_twt_setup)
3284                 return false;
3285
3286         if (!sdata->vif.bss_conf.twt_responder)
3287                 return false;
3288
3289         if (!rx->sta)
3290                 return false;
3291
3292         switch (mgmt->u.action.u.s1g.action_code) {
3293         case WLAN_S1G_TWT_SETUP: {
3294                 struct ieee80211_twt_setup *twt;
3295
3296                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3297                                    1 + /* action code */
3298                                    sizeof(struct ieee80211_twt_setup) +
3299                                    2 /* TWT req_type agrt */)
3300                         break;
3301
3302                 twt = (void *)mgmt->u.action.u.s1g.variable;
3303                 if (twt->element_id != WLAN_EID_S1G_TWT)
3304                         break;
3305
3306                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3307                                    4 + /* action code + token + tlv */
3308                                    twt->length)
3309                         break;
3310
3311                 return true; /* queue the frame */
3312         }
3313         case WLAN_S1G_TWT_TEARDOWN:
3314                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3315                         break;
3316
3317                 return true; /* queue the frame */
3318         default:
3319                 break;
3320         }
3321
3322         return false;
3323 }
3324
3325 static ieee80211_rx_result debug_noinline
3326 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3327 {
3328         struct ieee80211_local *local = rx->local;
3329         struct ieee80211_sub_if_data *sdata = rx->sdata;
3330         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3331         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3332         int len = rx->skb->len;
3333
3334         if (!ieee80211_is_action(mgmt->frame_control))
3335                 return RX_CONTINUE;
3336
3337         /* drop too small frames */
3338         if (len < IEEE80211_MIN_ACTION_SIZE)
3339                 return RX_DROP_UNUSABLE;
3340
3341         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3342             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3343             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3344                 return RX_DROP_UNUSABLE;
3345
3346         switch (mgmt->u.action.category) {
3347         case WLAN_CATEGORY_HT:
3348                 /* reject HT action frames from stations not supporting HT */
3349                 if (!rx->link_sta->pub->ht_cap.ht_supported)
3350                         goto invalid;
3351
3352                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3353                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3354                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3355                     sdata->vif.type != NL80211_IFTYPE_AP &&
3356                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3357                         break;
3358
3359                 /* verify action & smps_control/chanwidth are present */
3360                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3361                         goto invalid;
3362
3363                 switch (mgmt->u.action.u.ht_smps.action) {
3364                 case WLAN_HT_ACTION_SMPS: {
3365                         struct ieee80211_supported_band *sband;
3366                         enum ieee80211_smps_mode smps_mode;
3367                         struct sta_opmode_info sta_opmode = {};
3368
3369                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3370                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3371                                 goto handled;
3372
3373                         /* convert to HT capability */
3374                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3375                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3376                                 smps_mode = IEEE80211_SMPS_OFF;
3377                                 break;
3378                         case WLAN_HT_SMPS_CONTROL_STATIC:
3379                                 smps_mode = IEEE80211_SMPS_STATIC;
3380                                 break;
3381                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3382                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3383                                 break;
3384                         default:
3385                                 goto invalid;
3386                         }
3387
3388                         /* if no change do nothing */
3389                         if (rx->link_sta->pub->smps_mode == smps_mode)
3390                                 goto handled;
3391                         rx->link_sta->pub->smps_mode = smps_mode;
3392                         sta_opmode.smps_mode =
3393                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3394                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3395
3396                         sband = rx->local->hw.wiphy->bands[status->band];
3397
3398                         rate_control_rate_update(local, sband, rx->sta, 0,
3399                                                  IEEE80211_RC_SMPS_CHANGED);
3400                         cfg80211_sta_opmode_change_notify(sdata->dev,
3401                                                           rx->sta->addr,
3402                                                           &sta_opmode,
3403                                                           GFP_ATOMIC);
3404                         goto handled;
3405                 }
3406                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3407                         struct ieee80211_supported_band *sband;
3408                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3409                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3410                         struct sta_opmode_info sta_opmode = {};
3411
3412                         /* If it doesn't support 40 MHz it can't change ... */
3413                         if (!(rx->link_sta->pub->ht_cap.cap &
3414                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3415                                 goto handled;
3416
3417                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3418                                 max_bw = IEEE80211_STA_RX_BW_20;
3419                         else
3420                                 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3421
3422                         /* set cur_max_bandwidth and recalc sta bw */
3423                         rx->link_sta->cur_max_bandwidth = max_bw;
3424                         new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3425
3426                         if (rx->link_sta->pub->bandwidth == new_bw)
3427                                 goto handled;
3428
3429                         rx->link_sta->pub->bandwidth = new_bw;
3430                         sband = rx->local->hw.wiphy->bands[status->band];
3431                         sta_opmode.bw =
3432                                 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3433                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3434
3435                         rate_control_rate_update(local, sband, rx->sta, 0,
3436                                                  IEEE80211_RC_BW_CHANGED);
3437                         cfg80211_sta_opmode_change_notify(sdata->dev,
3438                                                           rx->sta->addr,
3439                                                           &sta_opmode,
3440                                                           GFP_ATOMIC);
3441                         goto handled;
3442                 }
3443                 default:
3444                         goto invalid;
3445                 }
3446
3447                 break;
3448         case WLAN_CATEGORY_PUBLIC:
3449                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3450                         goto invalid;
3451                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3452                         break;
3453                 if (!rx->sta)
3454                         break;
3455                 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3456                         break;
3457                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3458                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3459                         break;
3460                 if (len < offsetof(struct ieee80211_mgmt,
3461                                    u.action.u.ext_chan_switch.variable))
3462                         goto invalid;
3463                 goto queue;
3464         case WLAN_CATEGORY_VHT:
3465                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3466                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3467                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3468                     sdata->vif.type != NL80211_IFTYPE_AP &&
3469                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3470                         break;
3471
3472                 /* verify action code is present */
3473                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3474                         goto invalid;
3475
3476                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3477                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3478                         /* verify opmode is present */
3479                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3480                                 goto invalid;
3481                         goto queue;
3482                 }
3483                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3484                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3485                                 goto invalid;
3486                         goto queue;
3487                 }
3488                 default:
3489                         break;
3490                 }
3491                 break;
3492         case WLAN_CATEGORY_BACK:
3493                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3494                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3495                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3496                     sdata->vif.type != NL80211_IFTYPE_AP &&
3497                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3498                         break;
3499
3500                 /* verify action_code is present */
3501                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3502                         break;
3503
3504                 switch (mgmt->u.action.u.addba_req.action_code) {
3505                 case WLAN_ACTION_ADDBA_REQ:
3506                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3507                                    sizeof(mgmt->u.action.u.addba_req)))
3508                                 goto invalid;
3509                         break;
3510                 case WLAN_ACTION_ADDBA_RESP:
3511                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3512                                    sizeof(mgmt->u.action.u.addba_resp)))
3513                                 goto invalid;
3514                         break;
3515                 case WLAN_ACTION_DELBA:
3516                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3517                                    sizeof(mgmt->u.action.u.delba)))
3518                                 goto invalid;
3519                         break;
3520                 default:
3521                         goto invalid;
3522                 }
3523
3524                 goto queue;
3525         case WLAN_CATEGORY_SPECTRUM_MGMT:
3526                 /* verify action_code is present */
3527                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3528                         break;
3529
3530                 switch (mgmt->u.action.u.measurement.action_code) {
3531                 case WLAN_ACTION_SPCT_MSR_REQ:
3532                         if (status->band != NL80211_BAND_5GHZ)
3533                                 break;
3534
3535                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3536                                    sizeof(mgmt->u.action.u.measurement)))
3537                                 break;
3538
3539                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3540                                 break;
3541
3542                         ieee80211_process_measurement_req(sdata, mgmt, len);
3543                         goto handled;
3544                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3545                         u8 *bssid;
3546                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3547                                    sizeof(mgmt->u.action.u.chan_switch)))
3548                                 break;
3549
3550                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3551                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3552                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3553                                 break;
3554
3555                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3556                                 bssid = sdata->deflink.u.mgd.bssid;
3557                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3558                                 bssid = sdata->u.ibss.bssid;
3559                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3560                                 bssid = mgmt->sa;
3561                         else
3562                                 break;
3563
3564                         if (!ether_addr_equal(mgmt->bssid, bssid))
3565                                 break;
3566
3567                         goto queue;
3568                         }
3569                 }
3570                 break;
3571         case WLAN_CATEGORY_SELF_PROTECTED:
3572                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3573                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3574                         break;
3575
3576                 switch (mgmt->u.action.u.self_prot.action_code) {
3577                 case WLAN_SP_MESH_PEERING_OPEN:
3578                 case WLAN_SP_MESH_PEERING_CLOSE:
3579                 case WLAN_SP_MESH_PEERING_CONFIRM:
3580                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3581                                 goto invalid;
3582                         if (sdata->u.mesh.user_mpm)
3583                                 /* userspace handles this frame */
3584                                 break;
3585                         goto queue;
3586                 case WLAN_SP_MGK_INFORM:
3587                 case WLAN_SP_MGK_ACK:
3588                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3589                                 goto invalid;
3590                         break;
3591                 }
3592                 break;
3593         case WLAN_CATEGORY_MESH_ACTION:
3594                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3595                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3596                         break;
3597
3598                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3599                         break;
3600                 if (mesh_action_is_path_sel(mgmt) &&
3601                     !mesh_path_sel_is_hwmp(sdata))
3602                         break;
3603                 goto queue;
3604         case WLAN_CATEGORY_S1G:
3605                 switch (mgmt->u.action.u.s1g.action_code) {
3606                 case WLAN_S1G_TWT_SETUP:
3607                 case WLAN_S1G_TWT_TEARDOWN:
3608                         if (ieee80211_process_rx_twt_action(rx))
3609                                 goto queue;
3610                         break;
3611                 default:
3612                         break;
3613                 }
3614                 break;
3615         }
3616
3617         return RX_CONTINUE;
3618
3619  invalid:
3620         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3621         /* will return in the next handlers */
3622         return RX_CONTINUE;
3623
3624  handled:
3625         if (rx->sta)
3626                 rx->link_sta->rx_stats.packets++;
3627         dev_kfree_skb(rx->skb);
3628         return RX_QUEUED;
3629
3630  queue:
3631         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3632         return RX_QUEUED;
3633 }
3634
3635 static ieee80211_rx_result debug_noinline
3636 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3637 {
3638         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3639         struct cfg80211_rx_info info = {
3640                 .freq = ieee80211_rx_status_to_khz(status),
3641                 .buf = rx->skb->data,
3642                 .len = rx->skb->len,
3643                 .link_id = rx->link_id,
3644                 .have_link_id = rx->link_id >= 0,
3645         };
3646
3647         /* skip known-bad action frames and return them in the next handler */
3648         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3649                 return RX_CONTINUE;
3650
3651         /*
3652          * Getting here means the kernel doesn't know how to handle
3653          * it, but maybe userspace does ... include returned frames
3654          * so userspace can register for those to know whether ones
3655          * it transmitted were processed or returned.
3656          */
3657
3658         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3659             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3660                 info.sig_dbm = status->signal;
3661
3662         if (ieee80211_is_timing_measurement(rx->skb) ||
3663             ieee80211_is_ftm(rx->skb)) {
3664                 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3665                 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3666         }
3667
3668         if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3669                 if (rx->sta)
3670                         rx->link_sta->rx_stats.packets++;
3671                 dev_kfree_skb(rx->skb);
3672                 return RX_QUEUED;
3673         }
3674
3675         return RX_CONTINUE;
3676 }
3677
3678 static ieee80211_rx_result debug_noinline
3679 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3680 {
3681         struct ieee80211_sub_if_data *sdata = rx->sdata;
3682         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3683         int len = rx->skb->len;
3684
3685         if (!ieee80211_is_action(mgmt->frame_control))
3686                 return RX_CONTINUE;
3687
3688         switch (mgmt->u.action.category) {
3689         case WLAN_CATEGORY_SA_QUERY:
3690                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3691                            sizeof(mgmt->u.action.u.sa_query)))
3692                         break;
3693
3694                 switch (mgmt->u.action.u.sa_query.action) {
3695                 case WLAN_ACTION_SA_QUERY_REQUEST:
3696                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3697                                 break;
3698                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3699                         goto handled;
3700                 }
3701                 break;
3702         }
3703
3704         return RX_CONTINUE;
3705
3706  handled:
3707         if (rx->sta)
3708                 rx->link_sta->rx_stats.packets++;
3709         dev_kfree_skb(rx->skb);
3710         return RX_QUEUED;
3711 }
3712
3713 static ieee80211_rx_result debug_noinline
3714 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3715 {
3716         struct ieee80211_local *local = rx->local;
3717         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3718         struct sk_buff *nskb;
3719         struct ieee80211_sub_if_data *sdata = rx->sdata;
3720         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3721
3722         if (!ieee80211_is_action(mgmt->frame_control))
3723                 return RX_CONTINUE;
3724
3725         /*
3726          * For AP mode, hostapd is responsible for handling any action
3727          * frames that we didn't handle, including returning unknown
3728          * ones. For all other modes we will return them to the sender,
3729          * setting the 0x80 bit in the action category, as required by
3730          * 802.11-2012 9.24.4.
3731          * Newer versions of hostapd shall also use the management frame
3732          * registration mechanisms, but older ones still use cooked
3733          * monitor interfaces so push all frames there.
3734          */
3735         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3736             (sdata->vif.type == NL80211_IFTYPE_AP ||
3737              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3738                 return RX_DROP_MONITOR;
3739
3740         if (is_multicast_ether_addr(mgmt->da))
3741                 return RX_DROP_MONITOR;
3742
3743         /* do not return rejected action frames */
3744         if (mgmt->u.action.category & 0x80)
3745                 return RX_DROP_UNUSABLE;
3746
3747         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3748                                GFP_ATOMIC);
3749         if (nskb) {
3750                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3751
3752                 nmgmt->u.action.category |= 0x80;
3753                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3754                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3755
3756                 memset(nskb->cb, 0, sizeof(nskb->cb));
3757
3758                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3759                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3760
3761                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3762                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3763                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3764                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3765                                 info->hw_queue =
3766                                         local->hw.offchannel_tx_hw_queue;
3767                 }
3768
3769                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3770                                             status->band);
3771         }
3772         dev_kfree_skb(rx->skb);
3773         return RX_QUEUED;
3774 }
3775
3776 static ieee80211_rx_result debug_noinline
3777 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3778 {
3779         struct ieee80211_sub_if_data *sdata = rx->sdata;
3780         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3781
3782         if (!ieee80211_is_ext(hdr->frame_control))
3783                 return RX_CONTINUE;
3784
3785         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3786                 return RX_DROP_MONITOR;
3787
3788         /* for now only beacons are ext, so queue them */
3789         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3790
3791         return RX_QUEUED;
3792 }
3793
3794 static ieee80211_rx_result debug_noinline
3795 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3796 {
3797         struct ieee80211_sub_if_data *sdata = rx->sdata;
3798         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3799         __le16 stype;
3800
3801         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3802
3803         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3804             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3805             sdata->vif.type != NL80211_IFTYPE_OCB &&
3806             sdata->vif.type != NL80211_IFTYPE_STATION)
3807                 return RX_DROP_MONITOR;
3808
3809         switch (stype) {
3810         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3811         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3812         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3813                 /* process for all: mesh, mlme, ibss */
3814                 break;
3815         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3816                 if (is_multicast_ether_addr(mgmt->da) &&
3817                     !is_broadcast_ether_addr(mgmt->da))
3818                         return RX_DROP_MONITOR;
3819
3820                 /* process only for station/IBSS */
3821                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3822                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3823                         return RX_DROP_MONITOR;
3824                 break;
3825         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3826         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3827         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3828                 if (is_multicast_ether_addr(mgmt->da) &&
3829                     !is_broadcast_ether_addr(mgmt->da))
3830                         return RX_DROP_MONITOR;
3831
3832                 /* process only for station */
3833                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3834                         return RX_DROP_MONITOR;
3835                 break;
3836         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3837                 /* process only for ibss and mesh */
3838                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3839                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3840                         return RX_DROP_MONITOR;
3841                 break;
3842         default:
3843                 return RX_DROP_MONITOR;
3844         }
3845
3846         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3847
3848         return RX_QUEUED;
3849 }
3850
3851 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3852                                         struct ieee80211_rate *rate)
3853 {
3854         struct ieee80211_sub_if_data *sdata;
3855         struct ieee80211_local *local = rx->local;
3856         struct sk_buff *skb = rx->skb, *skb2;
3857         struct net_device *prev_dev = NULL;
3858         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3859         int needed_headroom;
3860
3861         /*
3862          * If cooked monitor has been processed already, then
3863          * don't do it again. If not, set the flag.
3864          */
3865         if (rx->flags & IEEE80211_RX_CMNTR)
3866                 goto out_free_skb;
3867         rx->flags |= IEEE80211_RX_CMNTR;
3868
3869         /* If there are no cooked monitor interfaces, just free the SKB */
3870         if (!local->cooked_mntrs)
3871                 goto out_free_skb;
3872
3873         /* vendor data is long removed here */
3874         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3875         /* room for the radiotap header based on driver features */
3876         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3877
3878         if (skb_headroom(skb) < needed_headroom &&
3879             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3880                 goto out_free_skb;
3881
3882         /* prepend radiotap information */
3883         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3884                                          false);
3885
3886         skb_reset_mac_header(skb);
3887         skb->ip_summed = CHECKSUM_UNNECESSARY;
3888         skb->pkt_type = PACKET_OTHERHOST;
3889         skb->protocol = htons(ETH_P_802_2);
3890
3891         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3892                 if (!ieee80211_sdata_running(sdata))
3893                         continue;
3894
3895                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3896                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3897                         continue;
3898
3899                 if (prev_dev) {
3900                         skb2 = skb_clone(skb, GFP_ATOMIC);
3901                         if (skb2) {
3902                                 skb2->dev = prev_dev;
3903                                 netif_receive_skb(skb2);
3904                         }
3905                 }
3906
3907                 prev_dev = sdata->dev;
3908                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3909         }
3910
3911         if (prev_dev) {
3912                 skb->dev = prev_dev;
3913                 netif_receive_skb(skb);
3914                 return;
3915         }
3916
3917  out_free_skb:
3918         dev_kfree_skb(skb);
3919 }
3920
3921 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3922                                          ieee80211_rx_result res)
3923 {
3924         switch (res) {
3925         case RX_DROP_MONITOR:
3926                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3927                 if (rx->sta)
3928                         rx->link_sta->rx_stats.dropped++;
3929                 fallthrough;
3930         case RX_CONTINUE: {
3931                 struct ieee80211_rate *rate = NULL;
3932                 struct ieee80211_supported_band *sband;
3933                 struct ieee80211_rx_status *status;
3934
3935                 status = IEEE80211_SKB_RXCB((rx->skb));
3936
3937                 sband = rx->local->hw.wiphy->bands[status->band];
3938                 if (status->encoding == RX_ENC_LEGACY)
3939                         rate = &sband->bitrates[status->rate_idx];
3940
3941                 ieee80211_rx_cooked_monitor(rx, rate);
3942                 break;
3943                 }
3944         case RX_DROP_UNUSABLE:
3945                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3946                 if (rx->sta)
3947                         rx->link_sta->rx_stats.dropped++;
3948                 dev_kfree_skb(rx->skb);
3949                 break;
3950         case RX_QUEUED:
3951                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3952                 break;
3953         }
3954 }
3955
3956 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3957                                   struct sk_buff_head *frames)
3958 {
3959         ieee80211_rx_result res = RX_DROP_MONITOR;
3960         struct sk_buff *skb;
3961
3962 #define CALL_RXH(rxh)                   \
3963         do {                            \
3964                 res = rxh(rx);          \
3965                 if (res != RX_CONTINUE) \
3966                         goto rxh_next;  \
3967         } while (0)
3968
3969         /* Lock here to avoid hitting all of the data used in the RX
3970          * path (e.g. key data, station data, ...) concurrently when
3971          * a frame is released from the reorder buffer due to timeout
3972          * from the timer, potentially concurrently with RX from the
3973          * driver.
3974          */
3975         spin_lock_bh(&rx->local->rx_path_lock);
3976
3977         while ((skb = __skb_dequeue(frames))) {
3978                 /*
3979                  * all the other fields are valid across frames
3980                  * that belong to an aMPDU since they are on the
3981                  * same TID from the same station
3982                  */
3983                 rx->skb = skb;
3984
3985                 if (WARN_ON_ONCE(!rx->link))
3986                         goto rxh_next;
3987
3988                 CALL_RXH(ieee80211_rx_h_check_more_data);
3989                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3990                 CALL_RXH(ieee80211_rx_h_sta_process);
3991                 CALL_RXH(ieee80211_rx_h_decrypt);
3992                 CALL_RXH(ieee80211_rx_h_defragment);
3993                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3994                 /* must be after MMIC verify so header is counted in MPDU mic */
3995 #ifdef CONFIG_MAC80211_MESH
3996                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3997                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3998 #endif
3999                 CALL_RXH(ieee80211_rx_h_amsdu);
4000                 CALL_RXH(ieee80211_rx_h_data);
4001
4002                 /* special treatment -- needs the queue */
4003                 res = ieee80211_rx_h_ctrl(rx, frames);
4004                 if (res != RX_CONTINUE)
4005                         goto rxh_next;
4006
4007                 CALL_RXH(ieee80211_rx_h_mgmt_check);
4008                 CALL_RXH(ieee80211_rx_h_action);
4009                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4010                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4011                 CALL_RXH(ieee80211_rx_h_action_return);
4012                 CALL_RXH(ieee80211_rx_h_ext);
4013                 CALL_RXH(ieee80211_rx_h_mgmt);
4014
4015  rxh_next:
4016                 ieee80211_rx_handlers_result(rx, res);
4017
4018 #undef CALL_RXH
4019         }
4020
4021         spin_unlock_bh(&rx->local->rx_path_lock);
4022 }
4023
4024 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4025 {
4026         struct sk_buff_head reorder_release;
4027         ieee80211_rx_result res = RX_DROP_MONITOR;
4028
4029         __skb_queue_head_init(&reorder_release);
4030
4031 #define CALL_RXH(rxh)                   \
4032         do {                            \
4033                 res = rxh(rx);          \
4034                 if (res != RX_CONTINUE) \
4035                         goto rxh_next;  \
4036         } while (0)
4037
4038         CALL_RXH(ieee80211_rx_h_check_dup);
4039         CALL_RXH(ieee80211_rx_h_check);
4040
4041         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4042
4043         ieee80211_rx_handlers(rx, &reorder_release);
4044         return;
4045
4046  rxh_next:
4047         ieee80211_rx_handlers_result(rx, res);
4048
4049 #undef CALL_RXH
4050 }
4051
4052 /*
4053  * This function makes calls into the RX path, therefore
4054  * it has to be invoked under RCU read lock.
4055  */
4056 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4057 {
4058         struct sk_buff_head frames;
4059         struct ieee80211_rx_data rx = {
4060                 .sta = sta,
4061                 .sdata = sta->sdata,
4062                 .local = sta->local,
4063                 /* This is OK -- must be QoS data frame */
4064                 .security_idx = tid,
4065                 .seqno_idx = tid,
4066                 .link_id = -1,
4067         };
4068         struct tid_ampdu_rx *tid_agg_rx;
4069         u8 link_id;
4070
4071         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4072         if (!tid_agg_rx)
4073                 return;
4074
4075         __skb_queue_head_init(&frames);
4076
4077         spin_lock(&tid_agg_rx->reorder_lock);
4078         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4079         spin_unlock(&tid_agg_rx->reorder_lock);
4080
4081         if (!skb_queue_empty(&frames)) {
4082                 struct ieee80211_event event = {
4083                         .type = BA_FRAME_TIMEOUT,
4084                         .u.ba.tid = tid,
4085                         .u.ba.sta = &sta->sta,
4086                 };
4087                 drv_event_callback(rx.local, rx.sdata, &event);
4088         }
4089         /* FIXME: statistics won't be right with this */
4090         link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
4091         rx.link = rcu_dereference(sta->sdata->link[link_id]);
4092         rx.link_sta = rcu_dereference(sta->link[link_id]);
4093
4094         ieee80211_rx_handlers(&rx, &frames);
4095 }
4096
4097 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4098                                           u16 ssn, u64 filtered,
4099                                           u16 received_mpdus)
4100 {
4101         struct sta_info *sta;
4102         struct tid_ampdu_rx *tid_agg_rx;
4103         struct sk_buff_head frames;
4104         struct ieee80211_rx_data rx = {
4105                 /* This is OK -- must be QoS data frame */
4106                 .security_idx = tid,
4107                 .seqno_idx = tid,
4108                 .link_id = -1,
4109         };
4110         int i, diff;
4111
4112         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4113                 return;
4114
4115         __skb_queue_head_init(&frames);
4116
4117         sta = container_of(pubsta, struct sta_info, sta);
4118
4119         rx.sta = sta;
4120         rx.sdata = sta->sdata;
4121         rx.link = &rx.sdata->deflink;
4122         rx.local = sta->local;
4123
4124         rcu_read_lock();
4125         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4126         if (!tid_agg_rx)
4127                 goto out;
4128
4129         spin_lock_bh(&tid_agg_rx->reorder_lock);
4130
4131         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4132                 int release;
4133
4134                 /* release all frames in the reorder buffer */
4135                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4136                            IEEE80211_SN_MODULO;
4137                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4138                                                  release, &frames);
4139                 /* update ssn to match received ssn */
4140                 tid_agg_rx->head_seq_num = ssn;
4141         } else {
4142                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4143                                                  &frames);
4144         }
4145
4146         /* handle the case that received ssn is behind the mac ssn.
4147          * it can be tid_agg_rx->buf_size behind and still be valid */
4148         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4149         if (diff >= tid_agg_rx->buf_size) {
4150                 tid_agg_rx->reorder_buf_filtered = 0;
4151                 goto release;
4152         }
4153         filtered = filtered >> diff;
4154         ssn += diff;
4155
4156         /* update bitmap */
4157         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4158                 int index = (ssn + i) % tid_agg_rx->buf_size;
4159
4160                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4161                 if (filtered & BIT_ULL(i))
4162                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4163         }
4164
4165         /* now process also frames that the filter marking released */
4166         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4167
4168 release:
4169         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4170
4171         ieee80211_rx_handlers(&rx, &frames);
4172
4173  out:
4174         rcu_read_unlock();
4175 }
4176 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4177
4178 /* main receive path */
4179
4180 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4181 {
4182         return ether_addr_equal(raddr, addr) ||
4183                is_broadcast_ether_addr(raddr);
4184 }
4185
4186 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4187 {
4188         struct ieee80211_sub_if_data *sdata = rx->sdata;
4189         struct sk_buff *skb = rx->skb;
4190         struct ieee80211_hdr *hdr = (void *)skb->data;
4191         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4192         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4193         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4194                          ieee80211_is_s1g_beacon(hdr->frame_control);
4195
4196         switch (sdata->vif.type) {
4197         case NL80211_IFTYPE_STATION:
4198                 if (!bssid && !sdata->u.mgd.use_4addr)
4199                         return false;
4200                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4201                         return false;
4202                 if (multicast)
4203                         return true;
4204                 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4205         case NL80211_IFTYPE_ADHOC:
4206                 if (!bssid)
4207                         return false;
4208                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4209                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4210                     !is_valid_ether_addr(hdr->addr2))
4211                         return false;
4212                 if (ieee80211_is_beacon(hdr->frame_control))
4213                         return true;
4214                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4215                         return false;
4216                 if (!multicast &&
4217                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4218                         return false;
4219                 if (!rx->sta) {
4220                         int rate_idx;
4221                         if (status->encoding != RX_ENC_LEGACY)
4222                                 rate_idx = 0; /* TODO: HT/VHT rates */
4223                         else
4224                                 rate_idx = status->rate_idx;
4225                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4226                                                  BIT(rate_idx));
4227                 }
4228                 return true;
4229         case NL80211_IFTYPE_OCB:
4230                 if (!bssid)
4231                         return false;
4232                 if (!ieee80211_is_data_present(hdr->frame_control))
4233                         return false;
4234                 if (!is_broadcast_ether_addr(bssid))
4235                         return false;
4236                 if (!multicast &&
4237                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4238                         return false;
4239                 if (!rx->sta) {
4240                         int rate_idx;
4241                         if (status->encoding != RX_ENC_LEGACY)
4242                                 rate_idx = 0; /* TODO: HT rates */
4243                         else
4244                                 rate_idx = status->rate_idx;
4245                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4246                                                 BIT(rate_idx));
4247                 }
4248                 return true;
4249         case NL80211_IFTYPE_MESH_POINT:
4250                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4251                         return false;
4252                 if (multicast)
4253                         return true;
4254                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4255         case NL80211_IFTYPE_AP_VLAN:
4256         case NL80211_IFTYPE_AP:
4257                 if (!bssid)
4258                         return ieee80211_is_our_addr(sdata, hdr->addr1,
4259                                                      &rx->link_id);
4260
4261                 if (!is_broadcast_ether_addr(bssid) &&
4262                     !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4263                         /*
4264                          * Accept public action frames even when the
4265                          * BSSID doesn't match, this is used for P2P
4266                          * and location updates. Note that mac80211
4267                          * itself never looks at these frames.
4268                          */
4269                         if (!multicast &&
4270                             !ieee80211_is_our_addr(sdata, hdr->addr1,
4271                                                    &rx->link_id))
4272                                 return false;
4273                         if (ieee80211_is_public_action(hdr, skb->len))
4274                                 return true;
4275                         return ieee80211_is_beacon(hdr->frame_control);
4276                 }
4277
4278                 if (!ieee80211_has_tods(hdr->frame_control)) {
4279                         /* ignore data frames to TDLS-peers */
4280                         if (ieee80211_is_data(hdr->frame_control))
4281                                 return false;
4282                         /* ignore action frames to TDLS-peers */
4283                         if (ieee80211_is_action(hdr->frame_control) &&
4284                             !is_broadcast_ether_addr(bssid) &&
4285                             !ether_addr_equal(bssid, hdr->addr1))
4286                                 return false;
4287                 }
4288
4289                 /*
4290                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4291                  * the BSSID - we've checked that already but may have accepted
4292                  * the wildcard (ff:ff:ff:ff:ff:ff).
4293                  *
4294                  * It also says:
4295                  *      The BSSID of the Data frame is determined as follows:
4296                  *      a) If the STA is contained within an AP or is associated
4297                  *         with an AP, the BSSID is the address currently in use
4298                  *         by the STA contained in the AP.
4299                  *
4300                  * So we should not accept data frames with an address that's
4301                  * multicast.
4302                  *
4303                  * Accepting it also opens a security problem because stations
4304                  * could encrypt it with the GTK and inject traffic that way.
4305                  */
4306                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4307                         return false;
4308
4309                 return true;
4310         case NL80211_IFTYPE_P2P_DEVICE:
4311                 return ieee80211_is_public_action(hdr, skb->len) ||
4312                        ieee80211_is_probe_req(hdr->frame_control) ||
4313                        ieee80211_is_probe_resp(hdr->frame_control) ||
4314                        ieee80211_is_beacon(hdr->frame_control);
4315         case NL80211_IFTYPE_NAN:
4316                 /* Currently no frames on NAN interface are allowed */
4317                 return false;
4318         default:
4319                 break;
4320         }
4321
4322         WARN_ON_ONCE(1);
4323         return false;
4324 }
4325
4326 void ieee80211_check_fast_rx(struct sta_info *sta)
4327 {
4328         struct ieee80211_sub_if_data *sdata = sta->sdata;
4329         struct ieee80211_local *local = sdata->local;
4330         struct ieee80211_key *key;
4331         struct ieee80211_fast_rx fastrx = {
4332                 .dev = sdata->dev,
4333                 .vif_type = sdata->vif.type,
4334                 .control_port_protocol = sdata->control_port_protocol,
4335         }, *old, *new = NULL;
4336         u32 offload_flags;
4337         bool set_offload = false;
4338         bool assign = false;
4339         bool offload;
4340
4341         /* use sparse to check that we don't return without updating */
4342         __acquire(check_fast_rx);
4343
4344         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4345         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4346         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4347         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4348
4349         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4350
4351         /* fast-rx doesn't do reordering */
4352         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4353             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4354                 goto clear;
4355
4356         switch (sdata->vif.type) {
4357         case NL80211_IFTYPE_STATION:
4358                 if (sta->sta.tdls) {
4359                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4360                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4361                         fastrx.expected_ds_bits = 0;
4362                 } else {
4363                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4364                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4365                         fastrx.expected_ds_bits =
4366                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4367                 }
4368
4369                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4370                         fastrx.expected_ds_bits |=
4371                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4372                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4373                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4374                 }
4375
4376                 if (!sdata->u.mgd.powersave)
4377                         break;
4378
4379                 /* software powersave is a huge mess, avoid all of it */
4380                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4381                         goto clear;
4382                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4383                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4384                         goto clear;
4385                 break;
4386         case NL80211_IFTYPE_AP_VLAN:
4387         case NL80211_IFTYPE_AP:
4388                 /* parallel-rx requires this, at least with calls to
4389                  * ieee80211_sta_ps_transition()
4390                  */
4391                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4392                         goto clear;
4393                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4394                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4395                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4396
4397                 fastrx.internal_forward =
4398                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4399                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4400                          !sdata->u.vlan.sta);
4401
4402                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4403                     sdata->u.vlan.sta) {
4404                         fastrx.expected_ds_bits |=
4405                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4406                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4407                         fastrx.internal_forward = 0;
4408                 }
4409
4410                 break;
4411         default:
4412                 goto clear;
4413         }
4414
4415         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4416                 goto clear;
4417
4418         rcu_read_lock();
4419         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4420         if (!key)
4421                 key = rcu_dereference(sdata->default_unicast_key);
4422         if (key) {
4423                 switch (key->conf.cipher) {
4424                 case WLAN_CIPHER_SUITE_TKIP:
4425                         /* we don't want to deal with MMIC in fast-rx */
4426                         goto clear_rcu;
4427                 case WLAN_CIPHER_SUITE_CCMP:
4428                 case WLAN_CIPHER_SUITE_CCMP_256:
4429                 case WLAN_CIPHER_SUITE_GCMP:
4430                 case WLAN_CIPHER_SUITE_GCMP_256:
4431                         break;
4432                 default:
4433                         /* We also don't want to deal with
4434                          * WEP or cipher scheme.
4435                          */
4436                         goto clear_rcu;
4437                 }
4438
4439                 fastrx.key = true;
4440                 fastrx.icv_len = key->conf.icv_len;
4441         }
4442
4443         assign = true;
4444  clear_rcu:
4445         rcu_read_unlock();
4446  clear:
4447         __release(check_fast_rx);
4448
4449         if (assign)
4450                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4451
4452         offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4453         offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4454
4455         if (assign && offload)
4456                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4457         else
4458                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4459
4460         if (set_offload)
4461                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4462
4463         spin_lock_bh(&sta->lock);
4464         old = rcu_dereference_protected(sta->fast_rx, true);
4465         rcu_assign_pointer(sta->fast_rx, new);
4466         spin_unlock_bh(&sta->lock);
4467
4468         if (old)
4469                 kfree_rcu(old, rcu_head);
4470 }
4471
4472 void ieee80211_clear_fast_rx(struct sta_info *sta)
4473 {
4474         struct ieee80211_fast_rx *old;
4475
4476         spin_lock_bh(&sta->lock);
4477         old = rcu_dereference_protected(sta->fast_rx, true);
4478         RCU_INIT_POINTER(sta->fast_rx, NULL);
4479         spin_unlock_bh(&sta->lock);
4480
4481         if (old)
4482                 kfree_rcu(old, rcu_head);
4483 }
4484
4485 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4486 {
4487         struct ieee80211_local *local = sdata->local;
4488         struct sta_info *sta;
4489
4490         lockdep_assert_held(&local->sta_mtx);
4491
4492         list_for_each_entry(sta, &local->sta_list, list) {
4493                 if (sdata != sta->sdata &&
4494                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4495                         continue;
4496                 ieee80211_check_fast_rx(sta);
4497         }
4498 }
4499
4500 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4501 {
4502         struct ieee80211_local *local = sdata->local;
4503
4504         mutex_lock(&local->sta_mtx);
4505         __ieee80211_check_fast_rx_iface(sdata);
4506         mutex_unlock(&local->sta_mtx);
4507 }
4508
4509 static bool
4510 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4511 {
4512         if (!sta->mlo)
4513                 return false;
4514
4515         return !!(sta->valid_links & BIT(link_id));
4516 }
4517
4518 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4519                               struct ieee80211_fast_rx *fast_rx,
4520                               int orig_len)
4521 {
4522         struct ieee80211_sta_rx_stats *stats;
4523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4524         struct sta_info *sta = rx->sta;
4525         struct link_sta_info *link_sta;
4526         struct sk_buff *skb = rx->skb;
4527         void *sa = skb->data + ETH_ALEN;
4528         void *da = skb->data;
4529
4530         if (rx->link_id >= 0) {
4531                 link_sta = rcu_dereference(sta->link[rx->link_id]);
4532                 if (WARN_ON_ONCE(!link_sta)) {
4533                         dev_kfree_skb(rx->skb);
4534                         return;
4535                 }
4536         } else {
4537                 link_sta = &sta->deflink;
4538         }
4539
4540         stats = &link_sta->rx_stats;
4541         if (fast_rx->uses_rss)
4542                 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4543
4544         /* statistics part of ieee80211_rx_h_sta_process() */
4545         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4546                 stats->last_signal = status->signal;
4547                 if (!fast_rx->uses_rss)
4548                         ewma_signal_add(&link_sta->rx_stats_avg.signal,
4549                                         -status->signal);
4550         }
4551
4552         if (status->chains) {
4553                 int i;
4554
4555                 stats->chains = status->chains;
4556                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4557                         int signal = status->chain_signal[i];
4558
4559                         if (!(status->chains & BIT(i)))
4560                                 continue;
4561
4562                         stats->chain_signal_last[i] = signal;
4563                         if (!fast_rx->uses_rss)
4564                                 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4565                                                 -signal);
4566                 }
4567         }
4568         /* end of statistics */
4569
4570         stats->last_rx = jiffies;
4571         stats->last_rate = sta_stats_encode_rate(status);
4572
4573         stats->fragments++;
4574         stats->packets++;
4575
4576         skb->dev = fast_rx->dev;
4577
4578         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4579
4580         /* The seqno index has the same property as needed
4581          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4582          * for non-QoS-data frames. Here we know it's a data
4583          * frame, so count MSDUs.
4584          */
4585         u64_stats_update_begin(&stats->syncp);
4586         stats->msdu[rx->seqno_idx]++;
4587         stats->bytes += orig_len;
4588         u64_stats_update_end(&stats->syncp);
4589
4590         if (fast_rx->internal_forward) {
4591                 struct sk_buff *xmit_skb = NULL;
4592                 if (is_multicast_ether_addr(da)) {
4593                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4594                 } else if (!ether_addr_equal(da, sa) &&
4595                            sta_info_get(rx->sdata, da)) {
4596                         xmit_skb = skb;
4597                         skb = NULL;
4598                 }
4599
4600                 if (xmit_skb) {
4601                         /*
4602                          * Send to wireless media and increase priority by 256
4603                          * to keep the received priority instead of
4604                          * reclassifying the frame (see cfg80211_classify8021d).
4605                          */
4606                         xmit_skb->priority += 256;
4607                         xmit_skb->protocol = htons(ETH_P_802_3);
4608                         skb_reset_network_header(xmit_skb);
4609                         skb_reset_mac_header(xmit_skb);
4610                         dev_queue_xmit(xmit_skb);
4611                 }
4612
4613                 if (!skb)
4614                         return;
4615         }
4616
4617         /* deliver to local stack */
4618         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4619         ieee80211_deliver_skb_to_local_stack(skb, rx);
4620 }
4621
4622 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4623                                      struct ieee80211_fast_rx *fast_rx)
4624 {
4625         struct sk_buff *skb = rx->skb;
4626         struct ieee80211_hdr *hdr = (void *)skb->data;
4627         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4628         struct sta_info *sta = rx->sta;
4629         int orig_len = skb->len;
4630         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4631         int snap_offs = hdrlen;
4632         struct {
4633                 u8 snap[sizeof(rfc1042_header)];
4634                 __be16 proto;
4635         } *payload __aligned(2);
4636         struct {
4637                 u8 da[ETH_ALEN];
4638                 u8 sa[ETH_ALEN];
4639         } addrs __aligned(2);
4640         struct link_sta_info *link_sta;
4641         struct ieee80211_sta_rx_stats *stats;
4642
4643         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4644          * to a common data structure; drivers can implement that per queue
4645          * but we don't have that information in mac80211
4646          */
4647         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4648                 return false;
4649
4650 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4651
4652         /* If using encryption, we also need to have:
4653          *  - PN_VALIDATED: similar, but the implementation is tricky
4654          *  - DECRYPTED: necessary for PN_VALIDATED
4655          */
4656         if (fast_rx->key &&
4657             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4658                 return false;
4659
4660         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4661                 return false;
4662
4663         if (unlikely(ieee80211_is_frag(hdr)))
4664                 return false;
4665
4666         /* Since our interface address cannot be multicast, this
4667          * implicitly also rejects multicast frames without the
4668          * explicit check.
4669          *
4670          * We shouldn't get any *data* frames not addressed to us
4671          * (AP mode will accept multicast *management* frames), but
4672          * punting here will make it go through the full checks in
4673          * ieee80211_accept_frame().
4674          */
4675         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4676                 return false;
4677
4678         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4679                                               IEEE80211_FCTL_TODS)) !=
4680             fast_rx->expected_ds_bits)
4681                 return false;
4682
4683         /* assign the key to drop unencrypted frames (later)
4684          * and strip the IV/MIC if necessary
4685          */
4686         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4687                 /* GCMP header length is the same */
4688                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4689         }
4690
4691         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4692                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4693                         return false;
4694
4695                 payload = (void *)(skb->data + snap_offs);
4696
4697                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4698                         return false;
4699
4700                 /* Don't handle these here since they require special code.
4701                  * Accept AARP and IPX even though they should come with a
4702                  * bridge-tunnel header - but if we get them this way then
4703                  * there's little point in discarding them.
4704                  */
4705                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4706                              payload->proto == fast_rx->control_port_protocol))
4707                         return false;
4708         }
4709
4710         /* after this point, don't punt to the slowpath! */
4711
4712         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4713             pskb_trim(skb, skb->len - fast_rx->icv_len))
4714                 goto drop;
4715
4716         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4717                 goto drop;
4718
4719         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4720                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4721                     RX_QUEUED)
4722                         goto drop;
4723
4724                 return true;
4725         }
4726
4727         /* do the header conversion - first grab the addresses */
4728         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4729         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4730         skb_postpull_rcsum(skb, skb->data + snap_offs,
4731                            sizeof(rfc1042_header) + 2);
4732         /* remove the SNAP but leave the ethertype */
4733         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4734         /* push the addresses in front */
4735         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4736
4737         ieee80211_rx_8023(rx, fast_rx, orig_len);
4738
4739         return true;
4740  drop:
4741         dev_kfree_skb(skb);
4742
4743         if (rx->link_id >= 0) {
4744                 link_sta = rcu_dereference(sta->link[rx->link_id]);
4745                 if (!link_sta)
4746                         return true;
4747         } else {
4748                 link_sta = &sta->deflink;
4749         }
4750
4751         if (fast_rx->uses_rss)
4752                 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4753         else
4754                 stats = &link_sta->rx_stats;
4755
4756         stats->dropped++;
4757         return true;
4758 }
4759
4760 /*
4761  * This function returns whether or not the SKB
4762  * was destined for RX processing or not, which,
4763  * if consume is true, is equivalent to whether
4764  * or not the skb was consumed.
4765  */
4766 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4767                                             struct sk_buff *skb, bool consume)
4768 {
4769         struct ieee80211_local *local = rx->local;
4770         struct ieee80211_sub_if_data *sdata = rx->sdata;
4771         struct ieee80211_hdr *hdr = (void *)skb->data;
4772         struct link_sta_info *link_sta = NULL;
4773         struct ieee80211_link_data *link;
4774
4775         rx->skb = skb;
4776
4777         /* See if we can do fast-rx; if we have to copy we already lost,
4778          * so punt in that case. We should never have to deliver a data
4779          * frame to multiple interfaces anyway.
4780          *
4781          * We skip the ieee80211_accept_frame() call and do the necessary
4782          * checking inside ieee80211_invoke_fast_rx().
4783          */
4784         if (consume && rx->sta) {
4785                 struct ieee80211_fast_rx *fast_rx;
4786
4787                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4788                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4789                         return true;
4790         }
4791
4792         if (!ieee80211_accept_frame(rx))
4793                 return false;
4794
4795         if (rx->link_id >= 0) {
4796                 link = rcu_dereference(rx->sdata->link[rx->link_id]);
4797
4798                 /* we might race link removal */
4799                 if (!link)
4800                         return true;
4801                 rx->link = link;
4802
4803                 if (rx->sta) {
4804                         rx->link_sta =
4805                                 rcu_dereference(rx->sta->link[rx->link_id]);
4806                         if (!rx->link_sta)
4807                                 return true;
4808                 }
4809         } else {
4810                 if (rx->sta)
4811                         rx->link_sta = &rx->sta->deflink;
4812
4813                 rx->link = &sdata->deflink;
4814         }
4815
4816         if (unlikely(!is_multicast_ether_addr(hdr->addr1) &&
4817                      rx->link_id >= 0 && rx->sta && rx->sta->sta.mlo)) {
4818                 link_sta = rcu_dereference(rx->sta->link[rx->link_id]);
4819
4820                 if (WARN_ON_ONCE(!link_sta))
4821                         return true;
4822         }
4823
4824         if (!consume) {
4825                 struct skb_shared_hwtstamps *shwt;
4826
4827                 rx->skb = skb_copy(skb, GFP_ATOMIC);
4828                 if (!rx->skb) {
4829                         if (net_ratelimit())
4830                                 wiphy_debug(local->hw.wiphy,
4831                                         "failed to copy skb for %s\n",
4832                                         sdata->name);
4833                         return true;
4834                 }
4835
4836                 /* skb_copy() does not copy the hw timestamps, so copy it
4837                  * explicitly
4838                  */
4839                 shwt = skb_hwtstamps(rx->skb);
4840                 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
4841         }
4842
4843         if (unlikely(link_sta)) {
4844                 /* translate to MLD addresses */
4845                 if (ether_addr_equal(link->conf->addr, hdr->addr1))
4846                         ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
4847                 if (ether_addr_equal(link_sta->addr, hdr->addr2))
4848                         ether_addr_copy(hdr->addr2, rx->sta->addr);
4849                 /* translate A3 only if it's the BSSID */
4850                 if (!ieee80211_has_tods(hdr->frame_control) &&
4851                     !ieee80211_has_fromds(hdr->frame_control)) {
4852                         if (ether_addr_equal(link_sta->addr, hdr->addr3))
4853                                 ether_addr_copy(hdr->addr3, rx->sta->addr);
4854                         else if (ether_addr_equal(link->conf->addr, hdr->addr3))
4855                                 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
4856                 }
4857                 /* not needed for A4 since it can only carry the SA */
4858         }
4859
4860         ieee80211_invoke_rx_handlers(rx);
4861         return true;
4862 }
4863
4864 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4865                                        struct ieee80211_sta *pubsta,
4866                                        struct sk_buff *skb,
4867                                        struct list_head *list)
4868 {
4869         struct ieee80211_local *local = hw_to_local(hw);
4870         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4871         struct ieee80211_fast_rx *fast_rx;
4872         struct ieee80211_rx_data rx;
4873
4874         memset(&rx, 0, sizeof(rx));
4875         rx.skb = skb;
4876         rx.local = local;
4877         rx.list = list;
4878         rx.link_id = -1;
4879
4880         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4881
4882         /* drop frame if too short for header */
4883         if (skb->len < sizeof(struct ethhdr))
4884                 goto drop;
4885
4886         if (!pubsta)
4887                 goto drop;
4888
4889         rx.sta = container_of(pubsta, struct sta_info, sta);
4890         rx.sdata = rx.sta->sdata;
4891
4892         if (status->link_valid &&
4893             !ieee80211_rx_is_valid_sta_link_id(pubsta, status->link_id))
4894                 goto drop;
4895
4896         /*
4897          * TODO: Should the frame be dropped if the right link_id is not
4898          * available? Or may be it is fine in the current form to proceed with
4899          * the frame processing because with frame being in 802.3 format,
4900          * link_id is used only for stats purpose and updating the stats on
4901          * the deflink is fine?
4902          */
4903         if (status->link_valid)
4904                 rx.link_id = status->link_id;
4905
4906         if (rx.link_id >= 0) {
4907                 struct ieee80211_link_data *link;
4908
4909                 link =  rcu_dereference(rx.sdata->link[rx.link_id]);
4910                 if (!link)
4911                         goto drop;
4912                 rx.link = link;
4913         } else {
4914                 rx.link = &rx.sdata->deflink;
4915         }
4916
4917         fast_rx = rcu_dereference(rx.sta->fast_rx);
4918         if (!fast_rx)
4919                 goto drop;
4920
4921         ieee80211_rx_8023(&rx, fast_rx, skb->len);
4922         return;
4923
4924 drop:
4925         dev_kfree_skb(skb);
4926 }
4927
4928 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
4929                                        struct sk_buff *skb, bool consume)
4930 {
4931         struct link_sta_info *link_sta;
4932         struct ieee80211_hdr *hdr = (void *)skb->data;
4933
4934         /*
4935          * Look up link station first, in case there's a
4936          * chance that they might have a link address that
4937          * is identical to the MLD address, that way we'll
4938          * have the link information if needed.
4939          */
4940         link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
4941         if (link_sta) {
4942                 rx->sta = link_sta->sta;
4943                 rx->link_id = link_sta->link_id;
4944         } else {
4945                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4946
4947                 rx->sta = sta_info_get_bss(rx->sdata, hdr->addr2);
4948                 if (rx->sta) {
4949                         if (status->link_valid &&
4950                             !ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta,
4951                                                                status->link_id))
4952                                 return false;
4953
4954                         rx->link_id = status->link_valid ? status->link_id : -1;
4955                 } else {
4956                         rx->link_id = -1;
4957                 }
4958         }
4959
4960         return ieee80211_prepare_and_rx_handle(rx, skb, consume);
4961 }
4962
4963 /*
4964  * This is the actual Rx frames handler. as it belongs to Rx path it must
4965  * be called with rcu_read_lock protection.
4966  */
4967 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4968                                          struct ieee80211_sta *pubsta,
4969                                          struct sk_buff *skb,
4970                                          struct list_head *list)
4971 {
4972         struct ieee80211_local *local = hw_to_local(hw);
4973         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4974         struct ieee80211_sub_if_data *sdata;
4975         struct ieee80211_hdr *hdr;
4976         __le16 fc;
4977         struct ieee80211_rx_data rx;
4978         struct ieee80211_sub_if_data *prev;
4979         struct rhlist_head *tmp;
4980         int err = 0;
4981
4982         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4983         memset(&rx, 0, sizeof(rx));
4984         rx.skb = skb;
4985         rx.local = local;
4986         rx.list = list;
4987         rx.link_id = -1;
4988
4989         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4990                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4991
4992         if (ieee80211_is_mgmt(fc)) {
4993                 /* drop frame if too short for header */
4994                 if (skb->len < ieee80211_hdrlen(fc))
4995                         err = -ENOBUFS;
4996                 else
4997                         err = skb_linearize(skb);
4998         } else {
4999                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5000         }
5001
5002         if (err) {
5003                 dev_kfree_skb(skb);
5004                 return;
5005         }
5006
5007         hdr = (struct ieee80211_hdr *)skb->data;
5008         ieee80211_parse_qos(&rx);
5009         ieee80211_verify_alignment(&rx);
5010
5011         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5012                      ieee80211_is_beacon(hdr->frame_control) ||
5013                      ieee80211_is_s1g_beacon(hdr->frame_control)))
5014                 ieee80211_scan_rx(local, skb);
5015
5016         if (ieee80211_is_data(fc)) {
5017                 struct sta_info *sta, *prev_sta;
5018                 u8 link_id = status->link_id;
5019
5020                 if (pubsta) {
5021                         rx.sta = container_of(pubsta, struct sta_info, sta);
5022                         rx.sdata = rx.sta->sdata;
5023
5024                         if (status->link_valid &&
5025                             !ieee80211_rx_is_valid_sta_link_id(pubsta, link_id))
5026                                 goto out;
5027
5028                         if (status->link_valid)
5029                                 rx.link_id = status->link_id;
5030
5031                         /*
5032                          * In MLO connection, fetch the link_id using addr2
5033                          * when the driver does not pass link_id in status.
5034                          * When the address translation is already performed by
5035                          * driver/hw, the valid link_id must be passed in
5036                          * status.
5037                          */
5038
5039                         if (!status->link_valid && pubsta->mlo) {
5040                                 struct ieee80211_hdr *hdr = (void *)skb->data;
5041                                 struct link_sta_info *link_sta;
5042
5043                                 link_sta = link_sta_info_get_bss(rx.sdata,
5044                                                                  hdr->addr2);
5045                                 if (!link_sta)
5046                                         goto out;
5047
5048                                 rx.link_id = link_sta->link_id;
5049                         }
5050
5051                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5052                                 return;
5053                         goto out;
5054                 }
5055
5056                 prev_sta = NULL;
5057
5058                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5059                         if (!prev_sta) {
5060                                 prev_sta = sta;
5061                                 continue;
5062                         }
5063
5064                         if ((status->link_valid &&
5065                              !ieee80211_rx_is_valid_sta_link_id(&prev_sta->sta,
5066                                                                 link_id)) ||
5067                             (!status->link_valid && prev_sta->sta.mlo))
5068                                 continue;
5069
5070                         rx.link_id = status->link_valid ? link_id : -1;
5071                         rx.sta = prev_sta;
5072                         rx.sdata = prev_sta->sdata;
5073                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
5074
5075                         prev_sta = sta;
5076                 }
5077
5078                 if (prev_sta) {
5079                         if ((status->link_valid &&
5080                              !ieee80211_rx_is_valid_sta_link_id(&prev_sta->sta,
5081                                                                 link_id)) ||
5082                             (!status->link_valid && prev_sta->sta.mlo))
5083                                 goto out;
5084
5085                         rx.link_id = status->link_valid ? link_id : -1;
5086                         rx.sta = prev_sta;
5087                         rx.sdata = prev_sta->sdata;
5088
5089                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5090                                 return;
5091                         goto out;
5092                 }
5093         }
5094
5095         prev = NULL;
5096
5097         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5098                 if (!ieee80211_sdata_running(sdata))
5099                         continue;
5100
5101                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5102                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5103                         continue;
5104
5105                 /*
5106                  * frame is destined for this interface, but if it's
5107                  * not also for the previous one we handle that after
5108                  * the loop to avoid copying the SKB once too much
5109                  */
5110
5111                 if (!prev) {
5112                         prev = sdata;
5113                         continue;
5114                 }
5115
5116                 rx.sdata = prev;
5117                 ieee80211_rx_for_interface(&rx, skb, false);
5118
5119                 prev = sdata;
5120         }
5121
5122         if (prev) {
5123                 rx.sdata = prev;
5124
5125                 if (ieee80211_rx_for_interface(&rx, skb, true))
5126                         return;
5127         }
5128
5129  out:
5130         dev_kfree_skb(skb);
5131 }
5132
5133 /*
5134  * This is the receive path handler. It is called by a low level driver when an
5135  * 802.11 MPDU is received from the hardware.
5136  */
5137 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5138                        struct sk_buff *skb, struct list_head *list)
5139 {
5140         struct ieee80211_local *local = hw_to_local(hw);
5141         struct ieee80211_rate *rate = NULL;
5142         struct ieee80211_supported_band *sband;
5143         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5144         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5145
5146         WARN_ON_ONCE(softirq_count() == 0);
5147
5148         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5149                 goto drop;
5150
5151         sband = local->hw.wiphy->bands[status->band];
5152         if (WARN_ON(!sband))
5153                 goto drop;
5154
5155         /*
5156          * If we're suspending, it is possible although not too likely
5157          * that we'd be receiving frames after having already partially
5158          * quiesced the stack. We can't process such frames then since
5159          * that might, for example, cause stations to be added or other
5160          * driver callbacks be invoked.
5161          */
5162         if (unlikely(local->quiescing || local->suspended))
5163                 goto drop;
5164
5165         /* We might be during a HW reconfig, prevent Rx for the same reason */
5166         if (unlikely(local->in_reconfig))
5167                 goto drop;
5168
5169         /*
5170          * The same happens when we're not even started,
5171          * but that's worth a warning.
5172          */
5173         if (WARN_ON(!local->started))
5174                 goto drop;
5175
5176         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5177                 /*
5178                  * Validate the rate, unless a PLCP error means that
5179                  * we probably can't have a valid rate here anyway.
5180                  */
5181
5182                 switch (status->encoding) {
5183                 case RX_ENC_HT:
5184                         /*
5185                          * rate_idx is MCS index, which can be [0-76]
5186                          * as documented on:
5187                          *
5188                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5189                          *
5190                          * Anything else would be some sort of driver or
5191                          * hardware error. The driver should catch hardware
5192                          * errors.
5193                          */
5194                         if (WARN(status->rate_idx > 76,
5195                                  "Rate marked as an HT rate but passed "
5196                                  "status->rate_idx is not "
5197                                  "an MCS index [0-76]: %d (0x%02x)\n",
5198                                  status->rate_idx,
5199                                  status->rate_idx))
5200                                 goto drop;
5201                         break;
5202                 case RX_ENC_VHT:
5203                         if (WARN_ONCE(status->rate_idx > 11 ||
5204                                       !status->nss ||
5205                                       status->nss > 8,
5206                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5207                                       status->rate_idx, status->nss))
5208                                 goto drop;
5209                         break;
5210                 case RX_ENC_HE:
5211                         if (WARN_ONCE(status->rate_idx > 11 ||
5212                                       !status->nss ||
5213                                       status->nss > 8,
5214                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5215                                       status->rate_idx, status->nss))
5216                                 goto drop;
5217                         break;
5218                 default:
5219                         WARN_ON_ONCE(1);
5220                         fallthrough;
5221                 case RX_ENC_LEGACY:
5222                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5223                                 goto drop;
5224                         rate = &sband->bitrates[status->rate_idx];
5225                 }
5226         }
5227
5228         if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5229                 goto drop;
5230
5231         status->rx_flags = 0;
5232
5233         kcov_remote_start_common(skb_get_kcov_handle(skb));
5234
5235         /*
5236          * Frames with failed FCS/PLCP checksum are not returned,
5237          * all other frames are returned without radiotap header
5238          * if it was previously present.
5239          * Also, frames with less than 16 bytes are dropped.
5240          */
5241         if (!(status->flag & RX_FLAG_8023))
5242                 skb = ieee80211_rx_monitor(local, skb, rate);
5243         if (skb) {
5244                 if ((status->flag & RX_FLAG_8023) ||
5245                         ieee80211_is_data_present(hdr->frame_control))
5246                         ieee80211_tpt_led_trig_rx(local, skb->len);
5247
5248                 if (status->flag & RX_FLAG_8023)
5249                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5250                 else
5251                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5252         }
5253
5254         kcov_remote_stop();
5255         return;
5256  drop:
5257         kfree_skb(skb);
5258 }
5259 EXPORT_SYMBOL(ieee80211_rx_list);
5260
5261 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5262                        struct sk_buff *skb, struct napi_struct *napi)
5263 {
5264         struct sk_buff *tmp;
5265         LIST_HEAD(list);
5266
5267
5268         /*
5269          * key references and virtual interfaces are protected using RCU
5270          * and this requires that we are in a read-side RCU section during
5271          * receive processing
5272          */
5273         rcu_read_lock();
5274         ieee80211_rx_list(hw, pubsta, skb, &list);
5275         rcu_read_unlock();
5276
5277         if (!napi) {
5278                 netif_receive_skb_list(&list);
5279                 return;
5280         }
5281
5282         list_for_each_entry_safe(skb, tmp, &list, list) {
5283                 skb_list_del_init(skb);
5284                 napi_gro_receive(napi, skb);
5285         }
5286 }
5287 EXPORT_SYMBOL(ieee80211_rx_napi);
5288
5289 /* This is a version of the rx handler that can be called from hard irq
5290  * context. Post the skb on the queue and schedule the tasklet */
5291 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5292 {
5293         struct ieee80211_local *local = hw_to_local(hw);
5294
5295         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5296
5297         skb->pkt_type = IEEE80211_RX_MSG;
5298         skb_queue_tail(&local->skb_queue, skb);
5299         tasklet_schedule(&local->tasklet);
5300 }
5301 EXPORT_SYMBOL(ieee80211_rx_irqsafe);