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) 2018-2020 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/bitops.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  36 {
  37         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  38
  39         u64_stats_update_begin(&tstats->syncp);
  40         tstats->rx_packets++;
  41         tstats->rx_bytes += len;
  42         u64_stats_update_end(&tstats->syncp);
  43 }
  44
  45 /*
  46  * monitor mode reception
  47  *
  48  * This function cleans up the SKB, i.e. it removes all the stuff
  49  * only useful for monitoring.
  50  */
  51 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
  52                                            unsigned int present_fcs_len,
  53                                            unsigned int rtap_space)
  54 {
  55         struct ieee80211_hdr *hdr;
  56         unsigned int hdrlen;
  57         __le16 fc;
  58
  59         if (present_fcs_len)
  60                 __pskb_trim(skb, skb->len - present_fcs_len);
  61         __pskb_pull(skb, rtap_space);
  62
  63         hdr = (void *)skb->data;
  64         fc = hdr->frame_control;
  65
  66         /*
  67          * Remove the HT-Control field (if present) on management
  68          * frames after we've sent the frame to monitoring. We
  69          * (currently) don't need it, and don't properly parse
  70          * frames with it present, due to the assumption of a
  71          * fixed management header length.
  72          */
  73         if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
  74                 return skb;
  75
  76         hdrlen = ieee80211_hdrlen(fc);
  77         hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
  78
  79         if (!pskb_may_pull(skb, hdrlen)) {
  80                 dev_kfree_skb(skb);
  81                 return NULL;
  82         }
  83
  84         memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
  85                 hdrlen - IEEE80211_HT_CTL_LEN);
  86         __pskb_pull(skb, IEEE80211_HT_CTL_LEN);
  87
  88         return skb;
  89 }
  90
  91 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  92                                      unsigned int rtap_space)
  93 {
  94         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  95         struct ieee80211_hdr *hdr;
  96
  97         hdr = (void *)(skb->data + rtap_space);
  98
  99         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 100                             RX_FLAG_FAILED_PLCP_CRC |
 101                             RX_FLAG_ONLY_MONITOR |
 102                             RX_FLAG_NO_PSDU))
 103                 return true;
 104
 105         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 106                 return true;
 107
 108         if (ieee80211_is_ctl(hdr->frame_control) &&
 109             !ieee80211_is_pspoll(hdr->frame_control) &&
 110             !ieee80211_is_back_req(hdr->frame_control))
 111                 return true;
 112
 113         return false;
 114 }
 115
 116 static int
 117 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 118                              struct ieee80211_rx_status *status,
 119                              struct sk_buff *skb)
 120 {
 121         int len;
 122
 123         /* always present fields */
 124         len = sizeof(struct ieee80211_radiotap_header) + 8;
 125
 126         /* allocate extra bitmaps */
 127         if (status->chains)
 128                 len += 4 * hweight8(status->chains);
 129         /* vendor presence bitmap */
 130         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 131                 len += 4;
 132
 133         if (ieee80211_have_rx_timestamp(status)) {
 134                 len = ALIGN(len, 8);
 135                 len += 8;
 136         }
 137         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 138                 len += 1;
 139
 140         /* antenna field, if we don't have per-chain info */
 141         if (!status->chains)
 142                 len += 1;
 143
 144         /* padding for RX_FLAGS if necessary */
 145         len = ALIGN(len, 2);
 146
 147         if (status->encoding == RX_ENC_HT) /* HT info */
 148                 len += 3;
 149
 150         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 151                 len = ALIGN(len, 4);
 152                 len += 8;
 153         }
 154
 155         if (status->encoding == RX_ENC_VHT) {
 156                 len = ALIGN(len, 2);
 157                 len += 12;
 158         }
 159
 160         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 161                 len = ALIGN(len, 8);
 162                 len += 12;
 163         }
 164
 165         if (status->encoding == RX_ENC_HE &&
 166             status->flag & RX_FLAG_RADIOTAP_HE) {
 167                 len = ALIGN(len, 2);
 168                 len += 12;
 169                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 170         }
 171
 172         if (status->encoding == RX_ENC_HE &&
 173             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 174                 len = ALIGN(len, 2);
 175                 len += 12;
 176                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 177         }
 178
 179         if (status->flag & RX_FLAG_NO_PSDU)
 180                 len += 1;
 181
 182         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 183                 len = ALIGN(len, 2);
 184                 len += 4;
 185                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 186         }
 187
 188         if (status->chains) {
 189                 /* antenna and antenna signal fields */
 190                 len += 2 * hweight8(status->chains);
 191         }
 192
 193         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 194                 struct ieee80211_vendor_radiotap *rtap;
 195                 int vendor_data_offset = 0;
 196
 197                 /*
 198                  * The position to look at depends on the existence (or non-
 199                  * existence) of other elements, so take that into account...
 200                  */
 201                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 202                         vendor_data_offset +=
 203                                 sizeof(struct ieee80211_radiotap_he);
 204                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 205                         vendor_data_offset +=
 206                                 sizeof(struct ieee80211_radiotap_he_mu);
 207                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 208                         vendor_data_offset +=
 209                                 sizeof(struct ieee80211_radiotap_lsig);
 210
 211                 rtap = (void *)&skb->data[vendor_data_offset];
 212
 213                 /* alignment for fixed 6-byte vendor data header */
 214                 len = ALIGN(len, 2);
 215                 /* vendor data header */
 216                 len += 6;
 217                 if (WARN_ON(rtap->align == 0))
 218                         rtap->align = 1;
 219                 len = ALIGN(len, rtap->align);
 220                 len += rtap->len + rtap->pad;
 221         }
 222
 223         return len;
 224 }
 225
 226 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 227                                          struct sk_buff *skb,
 228                                          int rtap_space)
 229 {
 230         struct {
 231                 struct ieee80211_hdr_3addr hdr;
 232                 u8 category;
 233                 u8 action_code;
 234         } __packed __aligned(2) action;
 235
 236         if (!sdata)
 237                 return;
 238
 239         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 240
 241         if (skb->len < rtap_space + sizeof(action) +
 242                        VHT_MUMIMO_GROUPS_DATA_LEN)
 243                 return;
 244
 245         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 246                 return;
 247
 248         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 249
 250         if (!ieee80211_is_action(action.hdr.frame_control))
 251                 return;
 252
 253         if (action.category != WLAN_CATEGORY_VHT)
 254                 return;
 255
 256         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 257                 return;
 258
 259         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 260                 return;
 261
 262         skb = skb_copy(skb, GFP_ATOMIC);
 263         if (!skb)
 264                 return;
 265
 266         skb_queue_tail(&sdata->skb_queue, skb);
 267         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 268 }
 269
 270 /*
 271  * ieee80211_add_rx_radiotap_header - add radiotap header
 272  *
 273  * add a radiotap header containing all the fields which the hardware provided.
 274  */
 275 static void
 276 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 277                                  struct sk_buff *skb,
 278                                  struct ieee80211_rate *rate,
 279                                  int rtap_len, bool has_fcs)
 280 {
 281         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 282         struct ieee80211_radiotap_header *rthdr;
 283         unsigned char *pos;
 284         __le32 *it_present;
 285         u32 it_present_val;
 286         u16 rx_flags = 0;
 287         u16 channel_flags = 0;
 288         int mpdulen, chain;
 289         unsigned long chains = status->chains;
 290         struct ieee80211_vendor_radiotap rtap = {};
 291         struct ieee80211_radiotap_he he = {};
 292         struct ieee80211_radiotap_he_mu he_mu = {};
 293         struct ieee80211_radiotap_lsig lsig = {};
 294
 295         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 296                 he = *(struct ieee80211_radiotap_he *)skb->data;
 297                 skb_pull(skb, sizeof(he));
 298                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 299         }
 300
 301         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 302                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 303                 skb_pull(skb, sizeof(he_mu));
 304         }
 305
 306         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 307                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 308                 skb_pull(skb, sizeof(lsig));
 309         }
 310
 311         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 312                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 313                 /* rtap.len and rtap.pad are undone immediately */
 314                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 315         }
 316
 317         mpdulen = skb->len;
 318         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 319                 mpdulen += FCS_LEN;
 320
 321         rthdr = skb_push(skb, rtap_len);
 322         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 323         it_present = &rthdr->it_present;
 324
 325         /* radiotap header, set always present flags */
 326         rthdr->it_len = cpu_to_le16(rtap_len);
 327         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 328                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 329                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 330
 331         if (!status->chains)
 332                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 333
 334         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 335                 it_present_val |=
 336                         BIT(IEEE80211_RADIOTAP_EXT) |
 337                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 338                 put_unaligned_le32(it_present_val, it_present);
 339                 it_present++;
 340                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 341                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 342         }
 343
 344         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 345                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 346                                   BIT(IEEE80211_RADIOTAP_EXT);
 347                 put_unaligned_le32(it_present_val, it_present);
 348                 it_present++;
 349                 it_present_val = rtap.present;
 350         }
 351
 352         put_unaligned_le32(it_present_val, it_present);
 353
 354         pos = (void *)(it_present + 1);
 355
 356         /* the order of the following fields is important */
 357
 358         /* IEEE80211_RADIOTAP_TSFT */
 359         if (ieee80211_have_rx_timestamp(status)) {
 360                 /* padding */
 361                 while ((pos - (u8 *)rthdr) & 7)
 362                         *pos++ = 0;
 363                 put_unaligned_le64(
 364                         ieee80211_calculate_rx_timestamp(local, status,
 365                                                          mpdulen, 0),
 366                         pos);
 367                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 368                 pos += 8;
 369         }
 370
 371         /* IEEE80211_RADIOTAP_FLAGS */
 372         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 373                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 374         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 375                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 376         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 377                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 378         pos++;
 379
 380         /* IEEE80211_RADIOTAP_RATE */
 381         if (!rate || status->encoding != RX_ENC_LEGACY) {
 382                 /*
 383                  * Without rate information don't add it. If we have,
 384                  * MCS information is a separate field in radiotap,
 385                  * added below. The byte here is needed as padding
 386                  * for the channel though, so initialise it to 0.
 387                  */
 388                 *pos = 0;
 389         } else {
 390                 int shift = 0;
 391                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 392                 if (status->bw == RATE_INFO_BW_10)
 393                         shift = 1;
 394                 else if (status->bw == RATE_INFO_BW_5)
 395                         shift = 2;
 396                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 397         }
 398         pos++;
 399
 400         /* IEEE80211_RADIOTAP_CHANNEL */
 401         /* TODO: frequency offset in KHz */
 402         put_unaligned_le16(status->freq, pos);
 403         pos += 2;
 404         if (status->bw == RATE_INFO_BW_10)
 405                 channel_flags |= IEEE80211_CHAN_HALF;
 406         else if (status->bw == RATE_INFO_BW_5)
 407                 channel_flags |= IEEE80211_CHAN_QUARTER;
 408
 409         if (status->band == NL80211_BAND_5GHZ ||
 410             status->band == NL80211_BAND_6GHZ)
 411                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 412         else if (status->encoding != RX_ENC_LEGACY)
 413                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 414         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 415                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 416         else if (rate)
 417                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 418         else
 419                 channel_flags |= IEEE80211_CHAN_2GHZ;
 420         put_unaligned_le16(channel_flags, pos);
 421         pos += 2;
 422
 423         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 424         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 425             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 426                 *pos = status->signal;
 427                 rthdr->it_present |=
 428                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 429                 pos++;
 430         }
 431
 432         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 433
 434         if (!status->chains) {
 435                 /* IEEE80211_RADIOTAP_ANTENNA */
 436                 *pos = status->antenna;
 437                 pos++;
 438         }
 439
 440         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 441
 442         /* IEEE80211_RADIOTAP_RX_FLAGS */
 443         /* ensure 2 byte alignment for the 2 byte field as required */
 444         if ((pos - (u8 *)rthdr) & 1)
 445                 *pos++ = 0;
 446         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 447                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 448         put_unaligned_le16(rx_flags, pos);
 449         pos += 2;
 450
 451         if (status->encoding == RX_ENC_HT) {
 452                 unsigned int stbc;
 453
 454                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 455                 *pos++ = local->hw.radiotap_mcs_details;
 456                 *pos = 0;
 457                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 458                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 459                 if (status->bw == RATE_INFO_BW_40)
 460                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 461                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 462                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 463                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 464                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 465                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 466                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 467                 pos++;
 468                 *pos++ = status->rate_idx;
 469         }
 470
 471         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 472                 u16 flags = 0;
 473
 474                 /* ensure 4 byte alignment */
 475                 while ((pos - (u8 *)rthdr) & 3)
 476                         pos++;
 477                 rthdr->it_present |=
 478                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 479                 put_unaligned_le32(status->ampdu_reference, pos);
 480                 pos += 4;
 481                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 482                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 483                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 484                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 485                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 486                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 487                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 488                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 489                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 490                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 491                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 492                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 493                 put_unaligned_le16(flags, pos);
 494                 pos += 2;
 495                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 496                         *pos++ = status->ampdu_delimiter_crc;
 497                 else
 498                         *pos++ = 0;
 499                 *pos++ = 0;
 500         }
 501
 502         if (status->encoding == RX_ENC_VHT) {
 503                 u16 known = local->hw.radiotap_vht_details;
 504
 505                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 506                 put_unaligned_le16(known, pos);
 507                 pos += 2;
 508                 /* flags */
 509                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 510                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 511                 /* in VHT, STBC is binary */
 512                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 513                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 514                 if (status->enc_flags & RX_ENC_FLAG_BF)
 515                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 516                 pos++;
 517                 /* bandwidth */
 518                 switch (status->bw) {
 519                 case RATE_INFO_BW_80:
 520                         *pos++ = 4;
 521                         break;
 522                 case RATE_INFO_BW_160:
 523                         *pos++ = 11;
 524                         break;
 525                 case RATE_INFO_BW_40:
 526                         *pos++ = 1;
 527                         break;
 528                 default:
 529                         *pos++ = 0;
 530                 }
 531                 /* MCS/NSS */
 532                 *pos = (status->rate_idx << 4) | status->nss;
 533                 pos += 4;
 534                 /* coding field */
 535                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 536                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 537                 pos++;
 538                 /* group ID */
 539                 pos++;
 540                 /* partial_aid */
 541                 pos += 2;
 542         }
 543
 544         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 545                 u16 accuracy = 0;
 546                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 547
 548                 rthdr->it_present |=
 549                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 550
 551                 /* ensure 8 byte alignment */
 552                 while ((pos - (u8 *)rthdr) & 7)
 553                         pos++;
 554
 555                 put_unaligned_le64(status->device_timestamp, pos);
 556                 pos += sizeof(u64);
 557
 558                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 559                         accuracy = local->hw.radiotap_timestamp.accuracy;
 560                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 561                 }
 562                 put_unaligned_le16(accuracy, pos);
 563                 pos += sizeof(u16);
 564
 565                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 566                 *pos++ = flags;
 567         }
 568
 569         if (status->encoding == RX_ENC_HE &&
 570             status->flag & RX_FLAG_RADIOTAP_HE) {
 571 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 572
 573                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 574                         he.data6 |= HE_PREP(DATA6_NSTS,
 575                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 576                                                       status->enc_flags));
 577                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 578                 } else {
 579                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 580                 }
 581
 582 #define CHECK_GI(s) \
 583         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 584                      (int)NL80211_RATE_INFO_HE_GI_##s)
 585
 586                 CHECK_GI(0_8);
 587                 CHECK_GI(1_6);
 588                 CHECK_GI(3_2);
 589
 590                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 591                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 592                 he.data3 |= HE_PREP(DATA3_CODING,
 593                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 594
 595                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 596
 597                 switch (status->bw) {
 598                 case RATE_INFO_BW_20:
 599                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 600                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 601                         break;
 602                 case RATE_INFO_BW_40:
 603                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 604                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 605                         break;
 606                 case RATE_INFO_BW_80:
 607                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 608                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 609                         break;
 610                 case RATE_INFO_BW_160:
 611                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 612                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 613                         break;
 614                 case RATE_INFO_BW_HE_RU:
 615 #define CHECK_RU_ALLOC(s) \
 616         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 617                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 618
 619                         CHECK_RU_ALLOC(26);
 620                         CHECK_RU_ALLOC(52);
 621                         CHECK_RU_ALLOC(106);
 622                         CHECK_RU_ALLOC(242);
 623                         CHECK_RU_ALLOC(484);
 624                         CHECK_RU_ALLOC(996);
 625                         CHECK_RU_ALLOC(2x996);
 626
 627                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 628                                             status->he_ru + 4);
 629                         break;
 630                 default:
 631                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 632                 }
 633
 634                 /* ensure 2 byte alignment */
 635                 while ((pos - (u8 *)rthdr) & 1)
 636                         pos++;
 637                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 638                 memcpy(pos, &he, sizeof(he));
 639                 pos += sizeof(he);
 640         }
 641
 642         if (status->encoding == RX_ENC_HE &&
 643             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 644                 /* ensure 2 byte alignment */
 645                 while ((pos - (u8 *)rthdr) & 1)
 646                         pos++;
 647                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 648                 memcpy(pos, &he_mu, sizeof(he_mu));
 649                 pos += sizeof(he_mu);
 650         }
 651
 652         if (status->flag & RX_FLAG_NO_PSDU) {
 653                 rthdr->it_present |=
 654                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 655                 *pos++ = status->zero_length_psdu_type;
 656         }
 657
 658         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 659                 /* ensure 2 byte alignment */
 660                 while ((pos - (u8 *)rthdr) & 1)
 661                         pos++;
 662                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 663                 memcpy(pos, &lsig, sizeof(lsig));
 664                 pos += sizeof(lsig);
 665         }
 666
 667         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 668                 *pos++ = status->chain_signal[chain];
 669                 *pos++ = chain;
 670         }
 671
 672         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 673                 /* ensure 2 byte alignment for the vendor field as required */
 674                 if ((pos - (u8 *)rthdr) & 1)
 675                         *pos++ = 0;
 676                 *pos++ = rtap.oui[0];
 677                 *pos++ = rtap.oui[1];
 678                 *pos++ = rtap.oui[2];
 679                 *pos++ = rtap.subns;
 680                 put_unaligned_le16(rtap.len, pos);
 681                 pos += 2;
 682                 /* align the actual payload as requested */
 683                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 684                         *pos++ = 0;
 685                 /* data (and possible padding) already follows */
 686         }
 687 }
 688
 689 static struct sk_buff *
 690 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 691                            struct sk_buff **origskb,
 692                            struct ieee80211_rate *rate,
 693                            int rtap_space, bool use_origskb)
 694 {
 695         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 696         int rt_hdrlen, needed_headroom;
 697         struct sk_buff *skb;
 698
 699         /* room for the radiotap header based on driver features */
 700         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 701         needed_headroom = rt_hdrlen - rtap_space;
 702
 703         if (use_origskb) {
 704                 /* only need to expand headroom if necessary */
 705                 skb = *origskb;
 706                 *origskb = NULL;
 707
 708                 /*
 709                  * This shouldn't trigger often because most devices have an
 710                  * RX header they pull before we get here, and that should
 711                  * be big enough for our radiotap information. We should
 712                  * probably export the length to drivers so that we can have
 713                  * them allocate enough headroom to start with.
 714                  */
 715                 if (skb_headroom(skb) < needed_headroom &&
 716                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 717                         dev_kfree_skb(skb);
 718                         return NULL;
 719                 }
 720         } else {
 721                 /*
 722                  * Need to make a copy and possibly remove radiotap header
 723                  * and FCS from the original.
 724                  */
 725                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 726
 727                 if (!skb)
 728                         return NULL;
 729         }
 730
 731         /* prepend radiotap information */
 732         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 733
 734         skb_reset_mac_header(skb);
 735         skb->ip_summed = CHECKSUM_UNNECESSARY;
 736         skb->pkt_type = PACKET_OTHERHOST;
 737         skb->protocol = htons(ETH_P_802_2);
 738
 739         return skb;
 740 }
 741
 742 /*
 743  * This function copies a received frame to all monitor interfaces and
 744  * returns a cleaned-up SKB that no longer includes the FCS nor the
 745  * radiotap header the driver might have added.
 746  */
 747 static struct sk_buff *
 748 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 749                      struct ieee80211_rate *rate)
 750 {
 751         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 752         struct ieee80211_sub_if_data *sdata;
 753         struct sk_buff *monskb = NULL;
 754         int present_fcs_len = 0;
 755         unsigned int rtap_space = 0;
 756         struct ieee80211_sub_if_data *monitor_sdata =
 757                 rcu_dereference(local->monitor_sdata);
 758         bool only_monitor = false;
 759         unsigned int min_head_len;
 760
 761         if (status->flag & RX_FLAG_RADIOTAP_HE)
 762                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 763
 764         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 765                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 766
 767         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 768                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 769
 770         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 771                 struct ieee80211_vendor_radiotap *rtap =
 772                         (void *)(origskb->data + rtap_space);
 773
 774                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 775         }
 776
 777         min_head_len = rtap_space;
 778
 779         /*
 780          * First, we may need to make a copy of the skb because
 781          *  (1) we need to modify it for radiotap (if not present), and
 782          *  (2) the other RX handlers will modify the skb we got.
 783          *
 784          * We don't need to, of course, if we aren't going to return
 785          * the SKB because it has a bad FCS/PLCP checksum.
 786          */
 787
 788         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 789                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 790                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 791                                 /* driver bug */
 792                                 WARN_ON(1);
 793                                 dev_kfree_skb(origskb);
 794                                 return NULL;
 795                         }
 796                         present_fcs_len = FCS_LEN;
 797                 }
 798
 799                 /* also consider the hdr->frame_control */
 800                 min_head_len += 2;
 801         }
 802
 803         /* ensure that the expected data elements are in skb head */
 804         if (!pskb_may_pull(origskb, min_head_len)) {
 805                 dev_kfree_skb(origskb);
 806                 return NULL;
 807         }
 808
 809         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 810
 811         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 812                 if (only_monitor) {
 813                         dev_kfree_skb(origskb);
 814                         return NULL;
 815                 }
 816
 817                 return ieee80211_clean_skb(origskb, present_fcs_len,
 818                                            rtap_space);
 819         }
 820
 821         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 822
 823         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 824                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 825                                                  &local->mon_list);
 826
 827                 if (!monskb)
 828                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 829                                                             rate, rtap_space,
 830                                                             only_monitor &&
 831                                                             last_monitor);
 832
 833                 if (monskb) {
 834                         struct sk_buff *skb;
 835
 836                         if (last_monitor) {
 837                                 skb = monskb;
 838                                 monskb = NULL;
 839                         } else {
 840                                 skb = skb_clone(monskb, GFP_ATOMIC);
 841                         }
 842
 843                         if (skb) {
 844                                 skb->dev = sdata->dev;
 845                                 ieee80211_rx_stats(skb->dev, skb->len);
 846                                 netif_receive_skb(skb);
 847                         }
 848                 }
 849
 850                 if (last_monitor)
 851                         break;
 852         }
 853
 854         /* this happens if last_monitor was erroneously false */
 855         dev_kfree_skb(monskb);
 856
 857         /* ditto */
 858         if (!origskb)
 859                 return NULL;
 860
 861         return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
 862 }
 863
 864 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 865 {
 866         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 867         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 868         int tid, seqno_idx, security_idx;
 869
 870         /* does the frame have a qos control field? */
 871         if (ieee80211_is_data_qos(hdr->frame_control)) {
 872                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 873                 /* frame has qos control */
 874                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 875                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 876                         status->rx_flags |= IEEE80211_RX_AMSDU;
 877
 878                 seqno_idx = tid;
 879                 security_idx = tid;
 880         } else {
 881                 /*
 882                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 883                  *
 884                  *      Sequence numbers for management frames, QoS data
 885                  *      frames with a broadcast/multicast address in the
 886                  *      Address 1 field, and all non-QoS data frames sent
 887                  *      by QoS STAs are assigned using an additional single
 888                  *      modulo-4096 counter, [...]
 889                  *
 890                  * We also use that counter for non-QoS STAs.
 891                  */
 892                 seqno_idx = IEEE80211_NUM_TIDS;
 893                 security_idx = 0;
 894                 if (ieee80211_is_mgmt(hdr->frame_control))
 895                         security_idx = IEEE80211_NUM_TIDS;
 896                 tid = 0;
 897         }
 898
 899         rx->seqno_idx = seqno_idx;
 900         rx->security_idx = security_idx;
 901         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 902          * For now, set skb->priority to 0 for other cases. */
 903         rx->skb->priority = (tid > 7) ? 0 : tid;
 904 }
 905
 906 /**
 907  * DOC: Packet alignment
 908  *
 909  * Drivers always need to pass packets that are aligned to two-byte boundaries
 910  * to the stack.
 911  *
 912  * Additionally, should, if possible, align the payload data in a way that
 913  * guarantees that the contained IP header is aligned to a four-byte
 914  * boundary. In the case of regular frames, this simply means aligning the
 915  * payload to a four-byte boundary (because either the IP header is directly
 916  * contained, or IV/RFC1042 headers that have a length divisible by four are
 917  * in front of it).  If the payload data is not properly aligned and the
 918  * architecture doesn't support efficient unaligned operations, mac80211
 919  * will align the data.
 920  *
 921  * With A-MSDU frames, however, the payload data address must yield two modulo
 922  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 923  * push the IP header further back to a multiple of four again. Thankfully, the
 924  * specs were sane enough this time around to require padding each A-MSDU
 925  * subframe to a length that is a multiple of four.
 926  *
 927  * Padding like Atheros hardware adds which is between the 802.11 header and
 928  * the payload is not supported, the driver is required to move the 802.11
 929  * header to be directly in front of the payload in that case.
 930  */
 931 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 932 {
 933 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 934         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 935 #endif
 936 }
 937
 938
 939 /* rx handlers */
 940
 941 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 942 {
 943         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 944
 945         if (is_multicast_ether_addr(hdr->addr1))
 946                 return 0;
 947
 948         return ieee80211_is_robust_mgmt_frame(skb);
 949 }
 950
 951
 952 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 953 {
 954         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 955
 956         if (!is_multicast_ether_addr(hdr->addr1))
 957                 return 0;
 958
 959         return ieee80211_is_robust_mgmt_frame(skb);
 960 }
 961
 962
 963 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 964 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 965 {
 966         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 967         struct ieee80211_mmie *mmie;
 968         struct ieee80211_mmie_16 *mmie16;
 969
 970         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 971                 return -1;
 972
 973         if (!ieee80211_is_robust_mgmt_frame(skb) &&
 974             !ieee80211_is_beacon(hdr->frame_control))
 975                 return -1; /* not a robust management frame */
 976
 977         mmie = (struct ieee80211_mmie *)
 978                 (skb->data + skb->len - sizeof(*mmie));
 979         if (mmie->element_id == WLAN_EID_MMIE &&
 980             mmie->length == sizeof(*mmie) - 2)
 981                 return le16_to_cpu(mmie->key_id);
 982
 983         mmie16 = (struct ieee80211_mmie_16 *)
 984                 (skb->data + skb->len - sizeof(*mmie16));
 985         if (skb->len >= 24 + sizeof(*mmie16) &&
 986             mmie16->element_id == WLAN_EID_MMIE &&
 987             mmie16->length == sizeof(*mmie16) - 2)
 988                 return le16_to_cpu(mmie16->key_id);
 989
 990         return -1;
 991 }
 992
 993 static int ieee80211_get_keyid(struct sk_buff *skb,
 994                                const struct ieee80211_cipher_scheme *cs)
 995 {
 996         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 997         __le16 fc;
 998         int hdrlen;
 999         int minlen;
1000         u8 key_idx_off;
1001         u8 key_idx_shift;
1002         u8 keyid;
1003
1004         fc = hdr->frame_control;
1005         hdrlen = ieee80211_hdrlen(fc);
1006
1007         if (cs) {
1008                 minlen = hdrlen + cs->hdr_len;
1009                 key_idx_off = hdrlen + cs->key_idx_off;
1010                 key_idx_shift = cs->key_idx_shift;
1011         } else {
1012                 /* WEP, TKIP, CCMP and GCMP */
1013                 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1014                 key_idx_off = hdrlen + 3;
1015                 key_idx_shift = 6;
1016         }
1017
1018         if (unlikely(skb->len < minlen))
1019                 return -EINVAL;
1020
1021         skb_copy_bits(skb, key_idx_off, &keyid, 1);
1022
1023         if (cs)
1024                 keyid &= cs->key_idx_mask;
1025         keyid >>= key_idx_shift;
1026
1027         /* cs could use more than the usual two bits for the keyid */
1028         if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1029                 return -EINVAL;
1030
1031         return keyid;
1032 }
1033
1034 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1035 {
1036         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1037         char *dev_addr = rx->sdata->vif.addr;
1038
1039         if (ieee80211_is_data(hdr->frame_control)) {
1040                 if (is_multicast_ether_addr(hdr->addr1)) {
1041                         if (ieee80211_has_tods(hdr->frame_control) ||
1042                             !ieee80211_has_fromds(hdr->frame_control))
1043                                 return RX_DROP_MONITOR;
1044                         if (ether_addr_equal(hdr->addr3, dev_addr))
1045                                 return RX_DROP_MONITOR;
1046                 } else {
1047                         if (!ieee80211_has_a4(hdr->frame_control))
1048                                 return RX_DROP_MONITOR;
1049                         if (ether_addr_equal(hdr->addr4, dev_addr))
1050                                 return RX_DROP_MONITOR;
1051                 }
1052         }
1053
1054         /* If there is not an established peer link and this is not a peer link
1055          * establisment frame, beacon or probe, drop the frame.
1056          */
1057
1058         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1059                 struct ieee80211_mgmt *mgmt;
1060
1061                 if (!ieee80211_is_mgmt(hdr->frame_control))
1062                         return RX_DROP_MONITOR;
1063
1064                 if (ieee80211_is_action(hdr->frame_control)) {
1065                         u8 category;
1066
1067                         /* make sure category field is present */
1068                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1069                                 return RX_DROP_MONITOR;
1070
1071                         mgmt = (struct ieee80211_mgmt *)hdr;
1072                         category = mgmt->u.action.category;
1073                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1074                             category != WLAN_CATEGORY_SELF_PROTECTED)
1075                                 return RX_DROP_MONITOR;
1076                         return RX_CONTINUE;
1077                 }
1078
1079                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1080                     ieee80211_is_probe_resp(hdr->frame_control) ||
1081                     ieee80211_is_beacon(hdr->frame_control) ||
1082                     ieee80211_is_auth(hdr->frame_control))
1083                         return RX_CONTINUE;
1084
1085                 return RX_DROP_MONITOR;
1086         }
1087
1088         return RX_CONTINUE;
1089 }
1090
1091 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1092                                               int index)
1093 {
1094         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1095         struct sk_buff *tail = skb_peek_tail(frames);
1096         struct ieee80211_rx_status *status;
1097
1098         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1099                 return true;
1100
1101         if (!tail)
1102                 return false;
1103
1104         status = IEEE80211_SKB_RXCB(tail);
1105         if (status->flag & RX_FLAG_AMSDU_MORE)
1106                 return false;
1107
1108         return true;
1109 }
1110
1111 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1112                                             struct tid_ampdu_rx *tid_agg_rx,
1113                                             int index,
1114                                             struct sk_buff_head *frames)
1115 {
1116         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1117         struct sk_buff *skb;
1118         struct ieee80211_rx_status *status;
1119
1120         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1121
1122         if (skb_queue_empty(skb_list))
1123                 goto no_frame;
1124
1125         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1126                 __skb_queue_purge(skb_list);
1127                 goto no_frame;
1128         }
1129
1130         /* release frames from the reorder ring buffer */
1131         tid_agg_rx->stored_mpdu_num--;
1132         while ((skb = __skb_dequeue(skb_list))) {
1133                 status = IEEE80211_SKB_RXCB(skb);
1134                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1135                 __skb_queue_tail(frames, skb);
1136         }
1137
1138 no_frame:
1139         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1140         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1141 }
1142
1143 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1144                                              struct tid_ampdu_rx *tid_agg_rx,
1145                                              u16 head_seq_num,
1146                                              struct sk_buff_head *frames)
1147 {
1148         int index;
1149
1150         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1151
1152         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1153                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1154                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1155                                                 frames);
1156         }
1157 }
1158
1159 /*
1160  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1161  * the skb was added to the buffer longer than this time ago, the earlier
1162  * frames that have not yet been received are assumed to be lost and the skb
1163  * can be released for processing. This may also release other skb's from the
1164  * reorder buffer if there are no additional gaps between the frames.
1165  *
1166  * Callers must hold tid_agg_rx->reorder_lock.
1167  */
1168 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1169
1170 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1171                                           struct tid_ampdu_rx *tid_agg_rx,
1172                                           struct sk_buff_head *frames)
1173 {
1174         int index, i, j;
1175
1176         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1177
1178         /* release the buffer until next missing frame */
1179         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1180         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1181             tid_agg_rx->stored_mpdu_num) {
1182                 /*
1183                  * No buffers ready to be released, but check whether any
1184                  * frames in the reorder buffer have timed out.
1185                  */
1186                 int skipped = 1;
1187                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1188                      j = (j + 1) % tid_agg_rx->buf_size) {
1189                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1190                                 skipped++;
1191                                 continue;
1192                         }
1193                         if (skipped &&
1194                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1195                                         HT_RX_REORDER_BUF_TIMEOUT))
1196                                 goto set_release_timer;
1197
1198                         /* don't leave incomplete A-MSDUs around */
1199                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1200                              i = (i + 1) % tid_agg_rx->buf_size)
1201                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1202
1203                         ht_dbg_ratelimited(sdata,
1204                                            "release an RX reorder frame due to timeout on earlier frames\n");
1205                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1206                                                         frames);
1207
1208                         /*
1209                          * Increment the head seq# also for the skipped slots.
1210                          */
1211                         tid_agg_rx->head_seq_num =
1212                                 (tid_agg_rx->head_seq_num +
1213                                  skipped) & IEEE80211_SN_MASK;
1214                         skipped = 0;
1215                 }
1216         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1217                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1218                                                 frames);
1219                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1220         }
1221
1222         if (tid_agg_rx->stored_mpdu_num) {
1223                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1224
1225                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1226                      j = (j + 1) % tid_agg_rx->buf_size) {
1227                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1228                                 break;
1229                 }
1230
1231  set_release_timer:
1232
1233                 if (!tid_agg_rx->removed)
1234                         mod_timer(&tid_agg_rx->reorder_timer,
1235                                   tid_agg_rx->reorder_time[j] + 1 +
1236                                   HT_RX_REORDER_BUF_TIMEOUT);
1237         } else {
1238                 del_timer(&tid_agg_rx->reorder_timer);
1239         }
1240 }
1241
1242 /*
1243  * As this function belongs to the RX path it must be under
1244  * rcu_read_lock protection. It returns false if the frame
1245  * can be processed immediately, true if it was consumed.
1246  */
1247 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1248                                              struct tid_ampdu_rx *tid_agg_rx,
1249                                              struct sk_buff *skb,
1250                                              struct sk_buff_head *frames)
1251 {
1252         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1253         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1254         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1255         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1256         u16 head_seq_num, buf_size;
1257         int index;
1258         bool ret = true;
1259
1260         spin_lock(&tid_agg_rx->reorder_lock);
1261
1262         /*
1263          * Offloaded BA sessions have no known starting sequence number so pick
1264          * one from first Rxed frame for this tid after BA was started.
1265          */
1266         if (unlikely(tid_agg_rx->auto_seq)) {
1267                 tid_agg_rx->auto_seq = false;
1268                 tid_agg_rx->ssn = mpdu_seq_num;
1269                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1270         }
1271
1272         buf_size = tid_agg_rx->buf_size;
1273         head_seq_num = tid_agg_rx->head_seq_num;
1274
1275         /*
1276          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1277          * be reordered.
1278          */
1279         if (unlikely(!tid_agg_rx->started)) {
1280                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1281                         ret = false;
1282                         goto out;
1283                 }
1284                 tid_agg_rx->started = true;
1285         }
1286
1287         /* frame with out of date sequence number */
1288         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1289                 dev_kfree_skb(skb);
1290                 goto out;
1291         }
1292
1293         /*
1294          * If frame the sequence number exceeds our buffering window
1295          * size release some previous frames to make room for this one.
1296          */
1297         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1298                 head_seq_num = ieee80211_sn_inc(
1299                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1300                 /* release stored frames up to new head to stack */
1301                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1302                                                  head_seq_num, frames);
1303         }
1304
1305         /* Now the new frame is always in the range of the reordering buffer */
1306
1307         index = mpdu_seq_num % tid_agg_rx->buf_size;
1308
1309         /* check if we already stored this frame */
1310         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1311                 dev_kfree_skb(skb);
1312                 goto out;
1313         }
1314
1315         /*
1316          * If the current MPDU is in the right order and nothing else
1317          * is stored we can process it directly, no need to buffer it.
1318          * If it is first but there's something stored, we may be able
1319          * to release frames after this one.
1320          */
1321         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1322             tid_agg_rx->stored_mpdu_num == 0) {
1323                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1324                         tid_agg_rx->head_seq_num =
1325                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1326                 ret = false;
1327                 goto out;
1328         }
1329
1330         /* put the frame in the reordering buffer */
1331         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1332         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1333                 tid_agg_rx->reorder_time[index] = jiffies;
1334                 tid_agg_rx->stored_mpdu_num++;
1335                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1336         }
1337
1338  out:
1339         spin_unlock(&tid_agg_rx->reorder_lock);
1340         return ret;
1341 }
1342
1343 /*
1344  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1345  * true if the MPDU was buffered, false if it should be processed.
1346  */
1347 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1348                                        struct sk_buff_head *frames)
1349 {
1350         struct sk_buff *skb = rx->skb;
1351         struct ieee80211_local *local = rx->local;
1352         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1353         struct sta_info *sta = rx->sta;
1354         struct tid_ampdu_rx *tid_agg_rx;
1355         u16 sc;
1356         u8 tid, ack_policy;
1357
1358         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1359             is_multicast_ether_addr(hdr->addr1))
1360                 goto dont_reorder;
1361
1362         /*
1363          * filter the QoS data rx stream according to
1364          * STA/TID and check if this STA/TID is on aggregation
1365          */
1366
1367         if (!sta)
1368                 goto dont_reorder;
1369
1370         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1371                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1372         tid = ieee80211_get_tid(hdr);
1373
1374         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1375         if (!tid_agg_rx) {
1376                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1377                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1378                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1379                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1380                                              WLAN_BACK_RECIPIENT,
1381                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1382                 goto dont_reorder;
1383         }
1384
1385         /* qos null data frames are excluded */
1386         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1387                 goto dont_reorder;
1388
1389         /* not part of a BA session */
1390         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1391             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1392                 goto dont_reorder;
1393
1394         /* new, potentially un-ordered, ampdu frame - process it */
1395
1396         /* reset session timer */
1397         if (tid_agg_rx->timeout)
1398                 tid_agg_rx->last_rx = jiffies;
1399
1400         /* if this mpdu is fragmented - terminate rx aggregation session */
1401         sc = le16_to_cpu(hdr->seq_ctrl);
1402         if (sc & IEEE80211_SCTL_FRAG) {
1403                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1404                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1405                 return;
1406         }
1407
1408         /*
1409          * No locking needed -- we will only ever process one
1410          * RX packet at a time, and thus own tid_agg_rx. All
1411          * other code manipulating it needs to (and does) make
1412          * sure that we cannot get to it any more before doing
1413          * anything with it.
1414          */
1415         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1416                                              frames))
1417                 return;
1418
1419  dont_reorder:
1420         __skb_queue_tail(frames, skb);
1421 }
1422
1423 static ieee80211_rx_result debug_noinline
1424 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1425 {
1426         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1427         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1428
1429         if (status->flag & RX_FLAG_DUP_VALIDATED)
1430                 return RX_CONTINUE;
1431
1432         /*
1433          * Drop duplicate 802.11 retransmissions
1434          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1435          */
1436
1437         if (rx->skb->len < 24)
1438                 return RX_CONTINUE;
1439
1440         if (ieee80211_is_ctl(hdr->frame_control) ||
1441             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1442             is_multicast_ether_addr(hdr->addr1))
1443                 return RX_CONTINUE;
1444
1445         if (!rx->sta)
1446                 return RX_CONTINUE;
1447
1448         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1449                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1450                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1451                 rx->sta->rx_stats.num_duplicates++;
1452                 return RX_DROP_UNUSABLE;
1453         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1454                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1455         }
1456
1457         return RX_CONTINUE;
1458 }
1459
1460 static ieee80211_rx_result debug_noinline
1461 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1462 {
1463         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1464
1465         /* Drop disallowed frame classes based on STA auth/assoc state;
1466          * IEEE 802.11, Chap 5.5.
1467          *
1468          * mac80211 filters only based on association state, i.e. it drops
1469          * Class 3 frames from not associated stations. hostapd sends
1470          * deauth/disassoc frames when needed. In addition, hostapd is
1471          * responsible for filtering on both auth and assoc states.
1472          */
1473
1474         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1475                 return ieee80211_rx_mesh_check(rx);
1476
1477         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1478                       ieee80211_is_pspoll(hdr->frame_control)) &&
1479                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1480                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1481                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1482                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1483                 /*
1484                  * accept port control frames from the AP even when it's not
1485                  * yet marked ASSOC to prevent a race where we don't set the
1486                  * assoc bit quickly enough before it sends the first frame
1487                  */
1488                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1489                     ieee80211_is_data_present(hdr->frame_control)) {
1490                         unsigned int hdrlen;
1491                         __be16 ethertype;
1492
1493                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1494
1495                         if (rx->skb->len < hdrlen + 8)
1496                                 return RX_DROP_MONITOR;
1497
1498                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1499                         if (ethertype == rx->sdata->control_port_protocol)
1500                                 return RX_CONTINUE;
1501                 }
1502
1503                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1504                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1505                                                hdr->addr2,
1506                                                GFP_ATOMIC))
1507                         return RX_DROP_UNUSABLE;
1508
1509                 return RX_DROP_MONITOR;
1510         }
1511
1512         return RX_CONTINUE;
1513 }
1514
1515
1516 static ieee80211_rx_result debug_noinline
1517 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1518 {
1519         struct ieee80211_local *local;
1520         struct ieee80211_hdr *hdr;
1521         struct sk_buff *skb;
1522
1523         local = rx->local;
1524         skb = rx->skb;
1525         hdr = (struct ieee80211_hdr *) skb->data;
1526
1527         if (!local->pspolling)
1528                 return RX_CONTINUE;
1529
1530         if (!ieee80211_has_fromds(hdr->frame_control))
1531                 /* this is not from AP */
1532                 return RX_CONTINUE;
1533
1534         if (!ieee80211_is_data(hdr->frame_control))
1535                 return RX_CONTINUE;
1536
1537         if (!ieee80211_has_moredata(hdr->frame_control)) {
1538                 /* AP has no more frames buffered for us */
1539                 local->pspolling = false;
1540                 return RX_CONTINUE;
1541         }
1542
1543         /* more data bit is set, let's request a new frame from the AP */
1544         ieee80211_send_pspoll(local, rx->sdata);
1545
1546         return RX_CONTINUE;
1547 }
1548
1549 static void sta_ps_start(struct sta_info *sta)
1550 {
1551         struct ieee80211_sub_if_data *sdata = sta->sdata;
1552         struct ieee80211_local *local = sdata->local;
1553         struct ps_data *ps;
1554         int tid;
1555
1556         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1557             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1558                 ps = &sdata->bss->ps;
1559         else
1560                 return;
1561
1562         atomic_inc(&ps->num_sta_ps);
1563         set_sta_flag(sta, WLAN_STA_PS_STA);
1564         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1565                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1566         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1567                sta->sta.addr, sta->sta.aid);
1568
1569         ieee80211_clear_fast_xmit(sta);
1570
1571         if (!sta->sta.txq[0])
1572                 return;
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 sk_buff *skb = rx->skb;
1732         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1733         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1734         int i;
1735
1736         if (!sta)
1737                 return RX_CONTINUE;
1738
1739         /*
1740          * Update last_rx only for IBSS packets which are for the current
1741          * BSSID and for station already AUTHORIZED to avoid keeping the
1742          * current IBSS network alive in cases where other STAs start
1743          * using different BSSID. This will also give the station another
1744          * chance to restart the authentication/authorization in case
1745          * something went wrong the first time.
1746          */
1747         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1748                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1749                                                 NL80211_IFTYPE_ADHOC);
1750                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1751                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1752                         sta->rx_stats.last_rx = jiffies;
1753                         if (ieee80211_is_data(hdr->frame_control) &&
1754                             !is_multicast_ether_addr(hdr->addr1))
1755                                 sta->rx_stats.last_rate =
1756                                         sta_stats_encode_rate(status);
1757                 }
1758         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1759                 sta->rx_stats.last_rx = jiffies;
1760         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1761                    is_multicast_ether_addr(hdr->addr1)) {
1762                 /*
1763                  * Mesh beacons will update last_rx when if they are found to
1764                  * match the current local configuration when processed.
1765                  */
1766                 sta->rx_stats.last_rx = jiffies;
1767                 if (ieee80211_is_data(hdr->frame_control))
1768                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1769         }
1770
1771         sta->rx_stats.fragments++;
1772
1773         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1774         sta->rx_stats.bytes += rx->skb->len;
1775         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1776
1777         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1778                 sta->rx_stats.last_signal = status->signal;
1779                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1780         }
1781
1782         if (status->chains) {
1783                 sta->rx_stats.chains = status->chains;
1784                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1785                         int signal = status->chain_signal[i];
1786
1787                         if (!(status->chains & BIT(i)))
1788                                 continue;
1789
1790                         sta->rx_stats.chain_signal_last[i] = signal;
1791                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1792                                         -signal);
1793                 }
1794         }
1795
1796         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1797                 return RX_CONTINUE;
1798
1799         /*
1800          * Change STA power saving mode only at the end of a frame
1801          * exchange sequence, and only for a data or management
1802          * frame as specified in IEEE 802.11-2016 11.2.3.2
1803          */
1804         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1805             !ieee80211_has_morefrags(hdr->frame_control) &&
1806             !is_multicast_ether_addr(hdr->addr1) &&
1807             (ieee80211_is_mgmt(hdr->frame_control) ||
1808              ieee80211_is_data(hdr->frame_control)) &&
1809             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1810             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1811              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1812                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1813                         if (!ieee80211_has_pm(hdr->frame_control))
1814                                 sta_ps_end(sta);
1815                 } else {
1816                         if (ieee80211_has_pm(hdr->frame_control))
1817                                 sta_ps_start(sta);
1818                 }
1819         }
1820
1821         /* mesh power save support */
1822         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1823                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1824
1825         /*
1826          * Drop (qos-)data::nullfunc frames silently, since they
1827          * are used only to control station power saving mode.
1828          */
1829         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1830                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1831
1832                 /*
1833                  * If we receive a 4-addr nullfunc frame from a STA
1834                  * that was not moved to a 4-addr STA vlan yet send
1835                  * the event to userspace and for older hostapd drop
1836                  * the frame to the monitor interface.
1837                  */
1838                 if (ieee80211_has_a4(hdr->frame_control) &&
1839                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1840                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841                       !rx->sdata->u.vlan.sta))) {
1842                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1843                                 cfg80211_rx_unexpected_4addr_frame(
1844                                         rx->sdata->dev, sta->sta.addr,
1845                                         GFP_ATOMIC);
1846                         return RX_DROP_MONITOR;
1847                 }
1848                 /*
1849                  * Update counter and free packet here to avoid
1850                  * counting this as a dropped packed.
1851                  */
1852                 sta->rx_stats.packets++;
1853                 dev_kfree_skb(rx->skb);
1854                 return RX_QUEUED;
1855         }
1856
1857         return RX_CONTINUE;
1858 } /* ieee80211_rx_h_sta_process */
1859
1860 static struct ieee80211_key *
1861 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1862 {
1863         struct ieee80211_key *key = NULL;
1864         struct ieee80211_sub_if_data *sdata = rx->sdata;
1865         int idx2;
1866
1867         /* Make sure key gets set if either BIGTK key index is set so that
1868          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1869          * Beacon frames and Beacon frames that claim to use another BIGTK key
1870          * index (i.e., a key that we do not have).
1871          */
1872
1873         if (idx < 0) {
1874                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1875                 idx2 = idx + 1;
1876         } else {
1877                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1878                         idx2 = idx + 1;
1879                 else
1880                         idx2 = idx - 1;
1881         }
1882
1883         if (rx->sta)
1884                 key = rcu_dereference(rx->sta->gtk[idx]);
1885         if (!key)
1886                 key = rcu_dereference(sdata->keys[idx]);
1887         if (!key && rx->sta)
1888                 key = rcu_dereference(rx->sta->gtk[idx2]);
1889         if (!key)
1890                 key = rcu_dereference(sdata->keys[idx2]);
1891
1892         return key;
1893 }
1894
1895 static ieee80211_rx_result debug_noinline
1896 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1897 {
1898         struct sk_buff *skb = rx->skb;
1899         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1900         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1901         int keyidx;
1902         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1903         struct ieee80211_key *sta_ptk = NULL;
1904         struct ieee80211_key *ptk_idx = NULL;
1905         int mmie_keyidx = -1;
1906         __le16 fc;
1907         const struct ieee80211_cipher_scheme *cs = NULL;
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                         cs = rx->sta->cipher_scheme;
1950                         keyid = ieee80211_get_keyid(rx->skb, cs);
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                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1980                                                      skb->data,
1981                                                      skb->len);
1982                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1983                 }
1984
1985                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1986                 if (!rx->key)
1987                         return RX_CONTINUE; /* Beacon protection not in use */
1988         } else if (mmie_keyidx >= 0) {
1989                 /* Broadcast/multicast robust management frame / BIP */
1990                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1991                     (status->flag & RX_FLAG_IV_STRIPPED))
1992                         return RX_CONTINUE;
1993
1994                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1995                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1996                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1997                 if (rx->sta) {
1998                         if (ieee80211_is_group_privacy_action(skb) &&
1999                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2000                                 return RX_DROP_MONITOR;
2001
2002                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2003                 }
2004                 if (!rx->key)
2005                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2006         } else if (!ieee80211_has_protected(fc)) {
2007                 /*
2008                  * The frame was not protected, so skip decryption. However, we
2009                  * need to set rx->key if there is a key that could have been
2010                  * used so that the frame may be dropped if encryption would
2011                  * have been expected.
2012                  */
2013                 struct ieee80211_key *key = NULL;
2014                 struct ieee80211_sub_if_data *sdata = rx->sdata;
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->sdata->default_mgmt_key);
2022                 } else {
2023                         if (rx->sta) {
2024                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2025                                         key = rcu_dereference(rx->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(sdata->keys[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, cs);
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->sta)
2062                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2063
2064                 /* if not found, try default key */
2065                 if (!rx->key) {
2066                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2067
2068                         /*
2069                          * RSNA-protected unicast frames should always be
2070                          * sent with pairwise or station-to-station keys,
2071                          * but for WEP we allow using a key index as well.
2072                          */
2073                         if (rx->key &&
2074                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2075                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2076                             !is_multicast_ether_addr(hdr->addr1))
2077                                 rx->key = NULL;
2078                 }
2079         }
2080
2081         if (rx->key) {
2082                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2083                         return RX_DROP_MONITOR;
2084
2085                 /* TODO: add threshold stuff again */
2086         } else {
2087                 return RX_DROP_MONITOR;
2088         }
2089
2090         switch (rx->key->conf.cipher) {
2091         case WLAN_CIPHER_SUITE_WEP40:
2092         case WLAN_CIPHER_SUITE_WEP104:
2093                 result = ieee80211_crypto_wep_decrypt(rx);
2094                 break;
2095         case WLAN_CIPHER_SUITE_TKIP:
2096                 result = ieee80211_crypto_tkip_decrypt(rx);
2097                 break;
2098         case WLAN_CIPHER_SUITE_CCMP:
2099                 result = ieee80211_crypto_ccmp_decrypt(
2100                         rx, IEEE80211_CCMP_MIC_LEN);
2101                 break;
2102         case WLAN_CIPHER_SUITE_CCMP_256:
2103                 result = ieee80211_crypto_ccmp_decrypt(
2104                         rx, IEEE80211_CCMP_256_MIC_LEN);
2105                 break;
2106         case WLAN_CIPHER_SUITE_AES_CMAC:
2107                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2108                 break;
2109         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2110                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2111                 break;
2112         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2113         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2114                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2115                 break;
2116         case WLAN_CIPHER_SUITE_GCMP:
2117         case WLAN_CIPHER_SUITE_GCMP_256:
2118                 result = ieee80211_crypto_gcmp_decrypt(rx);
2119                 break;
2120         default:
2121                 result = ieee80211_crypto_hw_decrypt(rx);
2122         }
2123
2124         /* the hdr variable is invalid after the decrypt handlers */
2125
2126         /* either the frame has been decrypted or will be dropped */
2127         status->flag |= RX_FLAG_DECRYPTED;
2128
2129         if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
2130                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2131                                              skb->data, skb->len);
2132
2133         return result;
2134 }
2135
2136 static inline struct ieee80211_fragment_entry *
2137 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2138                          unsigned int frag, unsigned int seq, int rx_queue,
2139                          struct sk_buff **skb)
2140 {
2141         struct ieee80211_fragment_entry *entry;
2142
2143         entry = &sdata->fragments[sdata->fragment_next++];
2144         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2145                 sdata->fragment_next = 0;
2146
2147         if (!skb_queue_empty(&entry->skb_list))
2148                 __skb_queue_purge(&entry->skb_list);
2149
2150         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2151         *skb = NULL;
2152         entry->first_frag_time = jiffies;
2153         entry->seq = seq;
2154         entry->rx_queue = rx_queue;
2155         entry->last_frag = frag;
2156         entry->check_sequential_pn = false;
2157         entry->extra_len = 0;
2158
2159         return entry;
2160 }
2161
2162 static inline struct ieee80211_fragment_entry *
2163 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2164                           unsigned int frag, unsigned int seq,
2165                           int rx_queue, struct ieee80211_hdr *hdr)
2166 {
2167         struct ieee80211_fragment_entry *entry;
2168         int i, idx;
2169
2170         idx = sdata->fragment_next;
2171         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2172                 struct ieee80211_hdr *f_hdr;
2173                 struct sk_buff *f_skb;
2174
2175                 idx--;
2176                 if (idx < 0)
2177                         idx = IEEE80211_FRAGMENT_MAX - 1;
2178
2179                 entry = &sdata->fragments[idx];
2180                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2181                     entry->rx_queue != rx_queue ||
2182                     entry->last_frag + 1 != frag)
2183                         continue;
2184
2185                 f_skb = __skb_peek(&entry->skb_list);
2186                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2187
2188                 /*
2189                  * Check ftype and addresses are equal, else check next fragment
2190                  */
2191                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2192                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2193                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2194                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2195                         continue;
2196
2197                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2198                         __skb_queue_purge(&entry->skb_list);
2199                         continue;
2200                 }
2201                 return entry;
2202         }
2203
2204         return NULL;
2205 }
2206
2207 static ieee80211_rx_result debug_noinline
2208 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2209 {
2210         struct ieee80211_hdr *hdr;
2211         u16 sc;
2212         __le16 fc;
2213         unsigned int frag, seq;
2214         struct ieee80211_fragment_entry *entry;
2215         struct sk_buff *skb;
2216
2217         hdr = (struct ieee80211_hdr *)rx->skb->data;
2218         fc = hdr->frame_control;
2219
2220         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2221                 return RX_CONTINUE;
2222
2223         sc = le16_to_cpu(hdr->seq_ctrl);
2224         frag = sc & IEEE80211_SCTL_FRAG;
2225
2226         if (is_multicast_ether_addr(hdr->addr1)) {
2227                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2228                 goto out_no_led;
2229         }
2230
2231         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2232                 goto out;
2233
2234         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2235
2236         if (skb_linearize(rx->skb))
2237                 return RX_DROP_UNUSABLE;
2238
2239         /*
2240          *  skb_linearize() might change the skb->data and
2241          *  previously cached variables (in this case, hdr) need to
2242          *  be refreshed with the new data.
2243          */
2244         hdr = (struct ieee80211_hdr *)rx->skb->data;
2245         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2246
2247         if (frag == 0) {
2248                 /* This is the first fragment of a new frame. */
2249                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2250                                                  rx->seqno_idx, &(rx->skb));
2251                 if (rx->key &&
2252                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2253                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2254                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2255                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2256                     ieee80211_has_protected(fc)) {
2257                         int queue = rx->security_idx;
2258
2259                         /* Store CCMP/GCMP PN so that we can verify that the
2260                          * next fragment has a sequential PN value.
2261                          */
2262                         entry->check_sequential_pn = true;
2263                         memcpy(entry->last_pn,
2264                                rx->key->u.ccmp.rx_pn[queue],
2265                                IEEE80211_CCMP_PN_LEN);
2266                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2267                                               u.ccmp.rx_pn) !=
2268                                      offsetof(struct ieee80211_key,
2269                                               u.gcmp.rx_pn));
2270                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2271                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2272                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2273                                      IEEE80211_GCMP_PN_LEN);
2274                 }
2275                 return RX_QUEUED;
2276         }
2277
2278         /* This is a fragment for a frame that should already be pending in
2279          * fragment cache. Add this fragment to the end of the pending entry.
2280          */
2281         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2282                                           rx->seqno_idx, hdr);
2283         if (!entry) {
2284                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2285                 return RX_DROP_MONITOR;
2286         }
2287
2288         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2289          *  MPDU PN values are not incrementing in steps of 1."
2290          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2291          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2292          */
2293         if (entry->check_sequential_pn) {
2294                 int i;
2295                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2296                 int queue;
2297
2298                 if (!rx->key ||
2299                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2300                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2301                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2302                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2303                         return RX_DROP_UNUSABLE;
2304                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2305                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2306                         pn[i]++;
2307                         if (pn[i])
2308                                 break;
2309                 }
2310                 queue = rx->security_idx;
2311                 rpn = rx->key->u.ccmp.rx_pn[queue];
2312                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2313                         return RX_DROP_UNUSABLE;
2314                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2315         }
2316
2317         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2318         __skb_queue_tail(&entry->skb_list, rx->skb);
2319         entry->last_frag = frag;
2320         entry->extra_len += rx->skb->len;
2321         if (ieee80211_has_morefrags(fc)) {
2322                 rx->skb = NULL;
2323                 return RX_QUEUED;
2324         }
2325
2326         rx->skb = __skb_dequeue(&entry->skb_list);
2327         if (skb_tailroom(rx->skb) < entry->extra_len) {
2328                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2329                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2330                                               GFP_ATOMIC))) {
2331                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2332                         __skb_queue_purge(&entry->skb_list);
2333                         return RX_DROP_UNUSABLE;
2334                 }
2335         }
2336         while ((skb = __skb_dequeue(&entry->skb_list))) {
2337                 skb_put_data(rx->skb, skb->data, skb->len);
2338                 dev_kfree_skb(skb);
2339         }
2340
2341  out:
2342         ieee80211_led_rx(rx->local);
2343  out_no_led:
2344         if (rx->sta)
2345                 rx->sta->rx_stats.packets++;
2346         return RX_CONTINUE;
2347 }
2348
2349 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2350 {
2351         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2352                 return -EACCES;
2353
2354         return 0;
2355 }
2356
2357 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2358 {
2359         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2360         struct sk_buff *skb = rx->skb;
2361         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2362
2363         /*
2364          * Pass through unencrypted frames if the hardware has
2365          * decrypted them already.
2366          */
2367         if (status->flag & RX_FLAG_DECRYPTED)
2368                 return 0;
2369
2370         /* check mesh EAPOL frames first */
2371         if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2372                      ieee80211_is_data(fc))) {
2373                 struct ieee80211s_hdr *mesh_hdr;
2374                 u16 hdr_len = ieee80211_hdrlen(fc);
2375                 u16 ethertype_offset;
2376                 __be16 ethertype;
2377
2378                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2379                         goto drop_check;
2380
2381                 /* make sure fixed part of mesh header is there, also checks skb len */
2382                 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2383                         goto drop_check;
2384
2385                 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2386                 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2387                                    sizeof(rfc1042_header);
2388
2389                 if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
2390                     ethertype == rx->sdata->control_port_protocol)
2391                         return 0;
2392         }
2393
2394 drop_check:
2395         /* Drop unencrypted frames if key is set. */
2396         if (unlikely(!ieee80211_has_protected(fc) &&
2397                      !ieee80211_is_any_nullfunc(fc) &&
2398                      ieee80211_is_data(fc) && rx->key))
2399                 return -EACCES;
2400
2401         return 0;
2402 }
2403
2404 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2405 {
2406         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2407         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2408         __le16 fc = hdr->frame_control;
2409
2410         /*
2411          * Pass through unencrypted frames if the hardware has
2412          * decrypted them already.
2413          */
2414         if (status->flag & RX_FLAG_DECRYPTED)
2415                 return 0;
2416
2417         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2418                 if (unlikely(!ieee80211_has_protected(fc) &&
2419                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2420                              rx->key)) {
2421                         if (ieee80211_is_deauth(fc) ||
2422                             ieee80211_is_disassoc(fc))
2423                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2424                                                              rx->skb->data,
2425                                                              rx->skb->len);
2426                         return -EACCES;
2427                 }
2428                 /* BIP does not use Protected field, so need to check MMIE */
2429                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2430                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2431                         if (ieee80211_is_deauth(fc) ||
2432                             ieee80211_is_disassoc(fc))
2433                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2434                                                              rx->skb->data,
2435                                                              rx->skb->len);
2436                         return -EACCES;
2437                 }
2438                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2439                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2440                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2441                                                      rx->skb->data,
2442                                                      rx->skb->len);
2443                         return -EACCES;
2444                 }
2445                 /*
2446                  * When using MFP, Action frames are not allowed prior to
2447                  * having configured keys.
2448                  */
2449                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2450                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2451                         return -EACCES;
2452         }
2453
2454         return 0;
2455 }
2456
2457 static int
2458 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2459 {
2460         struct ieee80211_sub_if_data *sdata = rx->sdata;
2461         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2462         bool check_port_control = false;
2463         struct ethhdr *ehdr;
2464         int ret;
2465
2466         *port_control = false;
2467         if (ieee80211_has_a4(hdr->frame_control) &&
2468             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2469                 return -1;
2470
2471         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2472             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2473
2474                 if (!sdata->u.mgd.use_4addr)
2475                         return -1;
2476                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2477                         check_port_control = true;
2478         }
2479
2480         if (is_multicast_ether_addr(hdr->addr1) &&
2481             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2482                 return -1;
2483
2484         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2485         if (ret < 0)
2486                 return ret;
2487
2488         ehdr = (struct ethhdr *) rx->skb->data;
2489         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2490                 *port_control = true;
2491         else if (check_port_control)
2492                 return -1;
2493
2494         return 0;
2495 }
2496
2497 /*
2498  * requires that rx->skb is a frame with ethernet header
2499  */
2500 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2501 {
2502         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2503                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2504         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2505
2506         /*
2507          * Allow EAPOL frames to us/the PAE group address regardless
2508          * of whether the frame was encrypted or not.
2509          */
2510         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2511             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2512              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2513                 return true;
2514
2515         if (ieee80211_802_1x_port_control(rx) ||
2516             ieee80211_drop_unencrypted(rx, fc))
2517                 return false;
2518
2519         return true;
2520 }
2521
2522 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2523                                                  struct ieee80211_rx_data *rx)
2524 {
2525         struct ieee80211_sub_if_data *sdata = rx->sdata;
2526         struct net_device *dev = sdata->dev;
2527
2528         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2529                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2530                       !sdata->control_port_no_preauth)) &&
2531                      sdata->control_port_over_nl80211)) {
2532                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2533                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2534
2535                 cfg80211_rx_control_port(dev, skb, noencrypt);
2536                 dev_kfree_skb(skb);
2537         } else {
2538                 memset(skb->cb, 0, sizeof(skb->cb));
2539
2540                 /* deliver to local stack */
2541                 if (rx->list)
2542                         list_add_tail(&skb->list, rx->list);
2543                 else
2544                         netif_receive_skb(skb);
2545         }
2546 }
2547
2548 /*
2549  * requires that rx->skb is a frame with ethernet header
2550  */
2551 static void
2552 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2553 {
2554         struct ieee80211_sub_if_data *sdata = rx->sdata;
2555         struct net_device *dev = sdata->dev;
2556         struct sk_buff *skb, *xmit_skb;
2557         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2558         struct sta_info *dsta;
2559
2560         skb = rx->skb;
2561         xmit_skb = NULL;
2562
2563         ieee80211_rx_stats(dev, skb->len);
2564
2565         if (rx->sta) {
2566                 /* The seqno index has the same property as needed
2567                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2568                  * for non-QoS-data frames. Here we know it's a data
2569                  * frame, so count MSDUs.
2570                  */
2571                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2572                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2573                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2574         }
2575
2576         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2577              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2578             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2579             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2580                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2581                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2582                         /*
2583                          * send multicast frames both to higher layers in
2584                          * local net stack and back to the wireless medium
2585                          */
2586                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2587                         if (!xmit_skb)
2588                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2589                                                     dev->name);
2590                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2591                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2592                         dsta = sta_info_get(sdata, ehdr->h_dest);
2593                         if (dsta) {
2594                                 /*
2595                                  * The destination station is associated to
2596                                  * this AP (in this VLAN), so send the frame
2597                                  * directly to it and do not pass it to local
2598                                  * net stack.
2599                                  */
2600                                 xmit_skb = skb;
2601                                 skb = NULL;
2602                         }
2603                 }
2604         }
2605
2606 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2607         if (skb) {
2608                 /* 'align' will only take the values 0 or 2 here since all
2609                  * frames are required to be aligned to 2-byte boundaries
2610                  * when being passed to mac80211; the code here works just
2611                  * as well if that isn't true, but mac80211 assumes it can
2612                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2613                  */
2614                 int align;
2615
2616                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2617                 if (align) {
2618                         if (WARN_ON(skb_headroom(skb) < 3)) {
2619                                 dev_kfree_skb(skb);
2620                                 skb = NULL;
2621                         } else {
2622                                 u8 *data = skb->data;
2623                                 size_t len = skb_headlen(skb);
2624                                 skb->data -= align;
2625                                 memmove(skb->data, data, len);
2626                                 skb_set_tail_pointer(skb, len);
2627                         }
2628                 }
2629         }
2630 #endif
2631
2632         if (skb) {
2633                 skb->protocol = eth_type_trans(skb, dev);
2634                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2635         }
2636
2637         if (xmit_skb) {
2638                 /*
2639                  * Send to wireless media and increase priority by 256 to
2640                  * keep the received priority instead of reclassifying
2641                  * the frame (see cfg80211_classify8021d).
2642                  */
2643                 xmit_skb->priority += 256;
2644                 xmit_skb->protocol = htons(ETH_P_802_3);
2645                 skb_reset_network_header(xmit_skb);
2646                 skb_reset_mac_header(xmit_skb);
2647                 dev_queue_xmit(xmit_skb);
2648         }
2649 }
2650
2651 static ieee80211_rx_result debug_noinline
2652 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2653 {
2654         struct net_device *dev = rx->sdata->dev;
2655         struct sk_buff *skb = rx->skb;
2656         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2657         __le16 fc = hdr->frame_control;
2658         struct sk_buff_head frame_list;
2659         struct ethhdr ethhdr;
2660         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2661
2662         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2663                 check_da = NULL;
2664                 check_sa = NULL;
2665         } else switch (rx->sdata->vif.type) {
2666                 case NL80211_IFTYPE_AP:
2667                 case NL80211_IFTYPE_AP_VLAN:
2668                         check_da = NULL;
2669                         break;
2670                 case NL80211_IFTYPE_STATION:
2671                         if (!rx->sta ||
2672                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2673                                 check_sa = NULL;
2674                         break;
2675                 case NL80211_IFTYPE_MESH_POINT:
2676                         check_sa = NULL;
2677                         break;
2678                 default:
2679                         break;
2680         }
2681
2682         skb->dev = dev;
2683         __skb_queue_head_init(&frame_list);
2684
2685         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2686                                           rx->sdata->vif.addr,
2687                                           rx->sdata->vif.type,
2688                                           data_offset))
2689                 return RX_DROP_UNUSABLE;
2690
2691         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2692                                  rx->sdata->vif.type,
2693                                  rx->local->hw.extra_tx_headroom,
2694                                  check_da, check_sa);
2695
2696         while (!skb_queue_empty(&frame_list)) {
2697                 rx->skb = __skb_dequeue(&frame_list);
2698
2699                 if (!ieee80211_frame_allowed(rx, fc)) {
2700                         dev_kfree_skb(rx->skb);
2701                         continue;
2702                 }
2703
2704                 ieee80211_deliver_skb(rx);
2705         }
2706
2707         return RX_QUEUED;
2708 }
2709
2710 static ieee80211_rx_result debug_noinline
2711 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2712 {
2713         struct sk_buff *skb = rx->skb;
2714         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2715         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2716         __le16 fc = hdr->frame_control;
2717
2718         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2719                 return RX_CONTINUE;
2720
2721         if (unlikely(!ieee80211_is_data(fc)))
2722                 return RX_CONTINUE;
2723
2724         if (unlikely(!ieee80211_is_data_present(fc)))
2725                 return RX_DROP_MONITOR;
2726
2727         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2728                 switch (rx->sdata->vif.type) {
2729                 case NL80211_IFTYPE_AP_VLAN:
2730                         if (!rx->sdata->u.vlan.sta)
2731                                 return RX_DROP_UNUSABLE;
2732                         break;
2733                 case NL80211_IFTYPE_STATION:
2734                         if (!rx->sdata->u.mgd.use_4addr)
2735                                 return RX_DROP_UNUSABLE;
2736                         break;
2737                 default:
2738                         return RX_DROP_UNUSABLE;
2739                 }
2740         }
2741
2742         if (is_multicast_ether_addr(hdr->addr1))
2743                 return RX_DROP_UNUSABLE;
2744
2745         return __ieee80211_rx_h_amsdu(rx, 0);
2746 }
2747
2748 #ifdef CONFIG_MAC80211_MESH
2749 static ieee80211_rx_result
2750 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2751 {
2752         struct ieee80211_hdr *fwd_hdr, *hdr;
2753         struct ieee80211_tx_info *info;
2754         struct ieee80211s_hdr *mesh_hdr;
2755         struct sk_buff *skb = rx->skb, *fwd_skb;
2756         struct ieee80211_local *local = rx->local;
2757         struct ieee80211_sub_if_data *sdata = rx->sdata;
2758         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2759         u16 ac, q, hdrlen;
2760         int tailroom = 0;
2761
2762         hdr = (struct ieee80211_hdr *) skb->data;
2763         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2764
2765         /* make sure fixed part of mesh header is there, also checks skb len */
2766         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2767                 return RX_DROP_MONITOR;
2768
2769         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2770
2771         /* make sure full mesh header is there, also checks skb len */
2772         if (!pskb_may_pull(rx->skb,
2773                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2774                 return RX_DROP_MONITOR;
2775
2776         /* reload pointers */
2777         hdr = (struct ieee80211_hdr *) skb->data;
2778         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2779
2780         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2781                 return RX_DROP_MONITOR;
2782
2783         /* frame is in RMC, don't forward */
2784         if (ieee80211_is_data(hdr->frame_control) &&
2785             is_multicast_ether_addr(hdr->addr1) &&
2786             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2787                 return RX_DROP_MONITOR;
2788
2789         if (!ieee80211_is_data(hdr->frame_control))
2790                 return RX_CONTINUE;
2791
2792         if (!mesh_hdr->ttl)
2793                 return RX_DROP_MONITOR;
2794
2795         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2796                 struct mesh_path *mppath;
2797                 char *proxied_addr;
2798                 char *mpp_addr;
2799
2800                 if (is_multicast_ether_addr(hdr->addr1)) {
2801                         mpp_addr = hdr->addr3;
2802                         proxied_addr = mesh_hdr->eaddr1;
2803                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2804                             MESH_FLAGS_AE_A5_A6) {
2805                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2806                         mpp_addr = hdr->addr4;
2807                         proxied_addr = mesh_hdr->eaddr2;
2808                 } else {
2809                         return RX_DROP_MONITOR;
2810                 }
2811
2812                 rcu_read_lock();
2813                 mppath = mpp_path_lookup(sdata, proxied_addr);
2814                 if (!mppath) {
2815                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2816                 } else {
2817                         spin_lock_bh(&mppath->state_lock);
2818                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2819                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2820                         mppath->exp_time = jiffies;
2821                         spin_unlock_bh(&mppath->state_lock);
2822                 }
2823                 rcu_read_unlock();
2824         }
2825
2826         /* Frame has reached destination.  Don't forward */
2827         if (!is_multicast_ether_addr(hdr->addr1) &&
2828             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2829                 return RX_CONTINUE;
2830
2831         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2832         q = sdata->vif.hw_queue[ac];
2833         if (ieee80211_queue_stopped(&local->hw, q)) {
2834                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2835                 return RX_DROP_MONITOR;
2836         }
2837         skb_set_queue_mapping(skb, q);
2838
2839         if (!--mesh_hdr->ttl) {
2840                 if (!is_multicast_ether_addr(hdr->addr1))
2841                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2842                                                      dropped_frames_ttl);
2843                 goto out;
2844         }
2845
2846         if (!ifmsh->mshcfg.dot11MeshForwarding)
2847                 goto out;
2848
2849         if (sdata->crypto_tx_tailroom_needed_cnt)
2850                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2851
2852         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2853                                        sdata->encrypt_headroom,
2854                                   tailroom, GFP_ATOMIC);
2855         if (!fwd_skb)
2856                 goto out;
2857
2858         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2859         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2860         info = IEEE80211_SKB_CB(fwd_skb);
2861         memset(info, 0, sizeof(*info));
2862         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2863         info->control.vif = &rx->sdata->vif;
2864         info->control.jiffies = jiffies;
2865         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2866                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2867                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2868                 /* update power mode indication when forwarding */
2869                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2870         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2871                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2872                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2873         } else {
2874                 /* unable to resolve next hop */
2875                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2876                                    fwd_hdr->addr3, 0,
2877                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2878                                    fwd_hdr->addr2);
2879                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2880                 kfree_skb(fwd_skb);
2881                 return RX_DROP_MONITOR;
2882         }
2883
2884         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2885         ieee80211_add_pending_skb(local, fwd_skb);
2886  out:
2887         if (is_multicast_ether_addr(hdr->addr1))
2888                 return RX_CONTINUE;
2889         return RX_DROP_MONITOR;
2890 }
2891 #endif
2892
2893 static ieee80211_rx_result debug_noinline
2894 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2895 {
2896         struct ieee80211_sub_if_data *sdata = rx->sdata;
2897         struct ieee80211_local *local = rx->local;
2898         struct net_device *dev = sdata->dev;
2899         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2900         __le16 fc = hdr->frame_control;
2901         bool port_control;
2902         int err;
2903
2904         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2905                 return RX_CONTINUE;
2906
2907         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2908                 return RX_DROP_MONITOR;
2909
2910         /*
2911          * Send unexpected-4addr-frame event to hostapd. For older versions,
2912          * also drop the frame to cooked monitor interfaces.
2913          */
2914         if (ieee80211_has_a4(hdr->frame_control) &&
2915             sdata->vif.type == NL80211_IFTYPE_AP) {
2916                 if (rx->sta &&
2917                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2918                         cfg80211_rx_unexpected_4addr_frame(
2919                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2920                 return RX_DROP_MONITOR;
2921         }
2922
2923         err = __ieee80211_data_to_8023(rx, &port_control);
2924         if (unlikely(err))
2925                 return RX_DROP_UNUSABLE;
2926
2927         if (!ieee80211_frame_allowed(rx, fc))
2928                 return RX_DROP_MONITOR;
2929
2930         /* directly handle TDLS channel switch requests/responses */
2931         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2932                                                 cpu_to_be16(ETH_P_TDLS))) {
2933                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2934
2935                 if (pskb_may_pull(rx->skb,
2936                                   offsetof(struct ieee80211_tdls_data, u)) &&
2937                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2938                     tf->category == WLAN_CATEGORY_TDLS &&
2939                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2940                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2941                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2942                         schedule_work(&local->tdls_chsw_work);
2943                         if (rx->sta)
2944                                 rx->sta->rx_stats.packets++;
2945
2946                         return RX_QUEUED;
2947                 }
2948         }
2949
2950         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2951             unlikely(port_control) && sdata->bss) {
2952                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2953                                      u.ap);
2954                 dev = sdata->dev;
2955                 rx->sdata = sdata;
2956         }
2957
2958         rx->skb->dev = dev;
2959
2960         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2961             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2962             !is_multicast_ether_addr(
2963                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2964             (!local->scanning &&
2965              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2966                 mod_timer(&local->dynamic_ps_timer, jiffies +
2967                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2968
2969         ieee80211_deliver_skb(rx);
2970
2971         return RX_QUEUED;
2972 }
2973
2974 static ieee80211_rx_result debug_noinline
2975 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2976 {
2977         struct sk_buff *skb = rx->skb;
2978         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2979         struct tid_ampdu_rx *tid_agg_rx;
2980         u16 start_seq_num;
2981         u16 tid;
2982
2983         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2984                 return RX_CONTINUE;
2985
2986         if (ieee80211_is_back_req(bar->frame_control)) {
2987                 struct {
2988                         __le16 control, start_seq_num;
2989                 } __packed bar_data;
2990                 struct ieee80211_event event = {
2991                         .type = BAR_RX_EVENT,
2992                 };
2993
2994                 if (!rx->sta)
2995                         return RX_DROP_MONITOR;
2996
2997                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2998                                   &bar_data, sizeof(bar_data)))
2999                         return RX_DROP_MONITOR;
3000
3001                 tid = le16_to_cpu(bar_data.control) >> 12;
3002
3003                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3004                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3005                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3006                                              WLAN_BACK_RECIPIENT,
3007                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3008
3009                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3010                 if (!tid_agg_rx)
3011                         return RX_DROP_MONITOR;
3012
3013                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3014                 event.u.ba.tid = tid;
3015                 event.u.ba.ssn = start_seq_num;
3016                 event.u.ba.sta = &rx->sta->sta;
3017
3018                 /* reset session timer */
3019                 if (tid_agg_rx->timeout)
3020                         mod_timer(&tid_agg_rx->session_timer,
3021                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3022
3023                 spin_lock(&tid_agg_rx->reorder_lock);
3024                 /* release stored frames up to start of BAR */
3025                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3026                                                  start_seq_num, frames);
3027                 spin_unlock(&tid_agg_rx->reorder_lock);
3028
3029                 drv_event_callback(rx->local, rx->sdata, &event);
3030
3031                 kfree_skb(skb);
3032                 return RX_QUEUED;
3033         }
3034
3035         /*
3036          * After this point, we only want management frames,
3037          * so we can drop all remaining control frames to
3038          * cooked monitor interfaces.
3039          */
3040         return RX_DROP_MONITOR;
3041 }
3042
3043 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3044                                            struct ieee80211_mgmt *mgmt,
3045                                            size_t len)
3046 {
3047         struct ieee80211_local *local = sdata->local;
3048         struct sk_buff *skb;
3049         struct ieee80211_mgmt *resp;
3050
3051         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3052                 /* Not to own unicast address */
3053                 return;
3054         }
3055
3056         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3057             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3058                 /* Not from the current AP or not associated yet. */
3059                 return;
3060         }
3061
3062         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3063                 /* Too short SA Query request frame */
3064                 return;
3065         }
3066
3067         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3068         if (skb == NULL)
3069                 return;
3070
3071         skb_reserve(skb, local->hw.extra_tx_headroom);
3072         resp = skb_put_zero(skb, 24);
3073         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3074         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3075         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3076         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3077                                           IEEE80211_STYPE_ACTION);
3078         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3079         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3080         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3081         memcpy(resp->u.action.u.sa_query.trans_id,
3082                mgmt->u.action.u.sa_query.trans_id,
3083                WLAN_SA_QUERY_TR_ID_LEN);
3084
3085         ieee80211_tx_skb(sdata, skb);
3086 }
3087
3088 static ieee80211_rx_result debug_noinline
3089 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3090 {
3091         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3092         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3093
3094         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3095                 return RX_CONTINUE;
3096
3097         /*
3098          * From here on, look only at management frames.
3099          * Data and control frames are already handled,
3100          * and unknown (reserved) frames are useless.
3101          */
3102         if (rx->skb->len < 24)
3103                 return RX_DROP_MONITOR;
3104
3105         if (!ieee80211_is_mgmt(mgmt->frame_control))
3106                 return RX_DROP_MONITOR;
3107
3108         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3109             ieee80211_is_beacon(mgmt->frame_control) &&
3110             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3111                 int sig = 0;
3112
3113                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3114                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3115                         sig = status->signal;
3116
3117                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3118                                                 rx->skb->data, rx->skb->len,
3119                                                 ieee80211_rx_status_to_khz(status),
3120                                                 sig);
3121                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3122         }
3123
3124         if (ieee80211_drop_unencrypted_mgmt(rx))
3125                 return RX_DROP_UNUSABLE;
3126
3127         return RX_CONTINUE;
3128 }
3129
3130 static ieee80211_rx_result debug_noinline
3131 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3132 {
3133         struct ieee80211_local *local = rx->local;
3134         struct ieee80211_sub_if_data *sdata = rx->sdata;
3135         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3136         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3137         int len = rx->skb->len;
3138
3139         if (!ieee80211_is_action(mgmt->frame_control))
3140                 return RX_CONTINUE;
3141
3142         /* drop too small frames */
3143         if (len < IEEE80211_MIN_ACTION_SIZE)
3144                 return RX_DROP_UNUSABLE;
3145
3146         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3147             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3148             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3149                 return RX_DROP_UNUSABLE;
3150
3151         switch (mgmt->u.action.category) {
3152         case WLAN_CATEGORY_HT:
3153                 /* reject HT action frames from stations not supporting HT */
3154                 if (!rx->sta->sta.ht_cap.ht_supported)
3155                         goto invalid;
3156
3157                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3158                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3159                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3160                     sdata->vif.type != NL80211_IFTYPE_AP &&
3161                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3162                         break;
3163
3164                 /* verify action & smps_control/chanwidth are present */
3165                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3166                         goto invalid;
3167
3168                 switch (mgmt->u.action.u.ht_smps.action) {
3169                 case WLAN_HT_ACTION_SMPS: {
3170                         struct ieee80211_supported_band *sband;
3171                         enum ieee80211_smps_mode smps_mode;
3172                         struct sta_opmode_info sta_opmode = {};
3173
3174                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3175                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3176                                 goto handled;
3177
3178                         /* convert to HT capability */
3179                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3180                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3181                                 smps_mode = IEEE80211_SMPS_OFF;
3182                                 break;
3183                         case WLAN_HT_SMPS_CONTROL_STATIC:
3184                                 smps_mode = IEEE80211_SMPS_STATIC;
3185                                 break;
3186                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3187                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3188                                 break;
3189                         default:
3190                                 goto invalid;
3191                         }
3192
3193                         /* if no change do nothing */
3194                         if (rx->sta->sta.smps_mode == smps_mode)
3195                                 goto handled;
3196                         rx->sta->sta.smps_mode = smps_mode;
3197                         sta_opmode.smps_mode =
3198                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3199                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3200
3201                         sband = rx->local->hw.wiphy->bands[status->band];
3202
3203                         rate_control_rate_update(local, sband, rx->sta,
3204                                                  IEEE80211_RC_SMPS_CHANGED);
3205                         cfg80211_sta_opmode_change_notify(sdata->dev,
3206                                                           rx->sta->addr,
3207                                                           &sta_opmode,
3208                                                           GFP_ATOMIC);
3209                         goto handled;
3210                 }
3211                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3212                         struct ieee80211_supported_band *sband;
3213                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3214                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3215                         struct sta_opmode_info sta_opmode = {};
3216
3217                         /* If it doesn't support 40 MHz it can't change ... */
3218                         if (!(rx->sta->sta.ht_cap.cap &
3219                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3220                                 goto handled;
3221
3222                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3223                                 max_bw = IEEE80211_STA_RX_BW_20;
3224                         else
3225                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3226
3227                         /* set cur_max_bandwidth and recalc sta bw */
3228                         rx->sta->cur_max_bandwidth = max_bw;
3229                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3230
3231                         if (rx->sta->sta.bandwidth == new_bw)
3232                                 goto handled;
3233
3234                         rx->sta->sta.bandwidth = new_bw;
3235                         sband = rx->local->hw.wiphy->bands[status->band];
3236                         sta_opmode.bw =
3237                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3238                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3239
3240                         rate_control_rate_update(local, sband, rx->sta,
3241                                                  IEEE80211_RC_BW_CHANGED);
3242                         cfg80211_sta_opmode_change_notify(sdata->dev,
3243                                                           rx->sta->addr,
3244                                                           &sta_opmode,
3245                                                           GFP_ATOMIC);
3246                         goto handled;
3247                 }
3248                 default:
3249                         goto invalid;
3250                 }
3251
3252                 break;
3253         case WLAN_CATEGORY_PUBLIC:
3254                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3255                         goto invalid;
3256                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3257                         break;
3258                 if (!rx->sta)
3259                         break;
3260                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3261                         break;
3262                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3263                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3264                         break;
3265                 if (len < offsetof(struct ieee80211_mgmt,
3266                                    u.action.u.ext_chan_switch.variable))
3267                         goto invalid;
3268                 goto queue;
3269         case WLAN_CATEGORY_VHT:
3270                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3271                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3272                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3273                     sdata->vif.type != NL80211_IFTYPE_AP &&
3274                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3275                         break;
3276
3277                 /* verify action code is present */
3278                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3279                         goto invalid;
3280
3281                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3282                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3283                         /* verify opmode is present */
3284                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3285                                 goto invalid;
3286                         goto queue;
3287                 }
3288                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3289                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3290                                 goto invalid;
3291                         goto queue;
3292                 }
3293                 default:
3294                         break;
3295                 }
3296                 break;
3297         case WLAN_CATEGORY_BACK:
3298                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3299                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3300                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3301                     sdata->vif.type != NL80211_IFTYPE_AP &&
3302                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3303                         break;
3304
3305                 /* verify action_code is present */
3306                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3307                         break;
3308
3309                 switch (mgmt->u.action.u.addba_req.action_code) {
3310                 case WLAN_ACTION_ADDBA_REQ:
3311                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3312                                    sizeof(mgmt->u.action.u.addba_req)))
3313                                 goto invalid;
3314                         break;
3315                 case WLAN_ACTION_ADDBA_RESP:
3316                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3317                                    sizeof(mgmt->u.action.u.addba_resp)))
3318                                 goto invalid;
3319                         break;
3320                 case WLAN_ACTION_DELBA:
3321                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3322                                    sizeof(mgmt->u.action.u.delba)))
3323                                 goto invalid;
3324                         break;
3325                 default:
3326                         goto invalid;
3327                 }
3328
3329                 goto queue;
3330         case WLAN_CATEGORY_SPECTRUM_MGMT:
3331                 /* verify action_code is present */
3332                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3333                         break;
3334
3335                 switch (mgmt->u.action.u.measurement.action_code) {
3336                 case WLAN_ACTION_SPCT_MSR_REQ:
3337                         if (status->band != NL80211_BAND_5GHZ)
3338                                 break;
3339
3340                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3341                                    sizeof(mgmt->u.action.u.measurement)))
3342                                 break;
3343
3344                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3345                                 break;
3346
3347                         ieee80211_process_measurement_req(sdata, mgmt, len);
3348                         goto handled;
3349                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3350                         u8 *bssid;
3351                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3352                                    sizeof(mgmt->u.action.u.chan_switch)))
3353                                 break;
3354
3355                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3356                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3357                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3358                                 break;
3359
3360                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3361                                 bssid = sdata->u.mgd.bssid;
3362                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3363                                 bssid = sdata->u.ibss.bssid;
3364                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3365                                 bssid = mgmt->sa;
3366                         else
3367                                 break;
3368
3369                         if (!ether_addr_equal(mgmt->bssid, bssid))
3370                                 break;
3371
3372                         goto queue;
3373                         }
3374                 }
3375                 break;
3376         case WLAN_CATEGORY_SELF_PROTECTED:
3377                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3378                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3379                         break;
3380
3381                 switch (mgmt->u.action.u.self_prot.action_code) {
3382                 case WLAN_SP_MESH_PEERING_OPEN:
3383                 case WLAN_SP_MESH_PEERING_CLOSE:
3384                 case WLAN_SP_MESH_PEERING_CONFIRM:
3385                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3386                                 goto invalid;
3387                         if (sdata->u.mesh.user_mpm)
3388                                 /* userspace handles this frame */
3389                                 break;
3390                         goto queue;
3391                 case WLAN_SP_MGK_INFORM:
3392                 case WLAN_SP_MGK_ACK:
3393                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3394                                 goto invalid;
3395                         break;
3396                 }
3397                 break;
3398         case WLAN_CATEGORY_MESH_ACTION:
3399                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3400                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3401                         break;
3402
3403                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3404                         break;
3405                 if (mesh_action_is_path_sel(mgmt) &&
3406                     !mesh_path_sel_is_hwmp(sdata))
3407                         break;
3408                 goto queue;
3409         }
3410
3411         return RX_CONTINUE;
3412
3413  invalid:
3414         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3415         /* will return in the next handlers */
3416         return RX_CONTINUE;
3417
3418  handled:
3419         if (rx->sta)
3420                 rx->sta->rx_stats.packets++;
3421         dev_kfree_skb(rx->skb);
3422         return RX_QUEUED;
3423
3424  queue:
3425         skb_queue_tail(&sdata->skb_queue, rx->skb);
3426         ieee80211_queue_work(&local->hw, &sdata->work);
3427         if (rx->sta)
3428                 rx->sta->rx_stats.packets++;
3429         return RX_QUEUED;
3430 }
3431
3432 static ieee80211_rx_result debug_noinline
3433 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3434 {
3435         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3436         int sig = 0;
3437
3438         /* skip known-bad action frames and return them in the next handler */
3439         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3440                 return RX_CONTINUE;
3441
3442         /*
3443          * Getting here means the kernel doesn't know how to handle
3444          * it, but maybe userspace does ... include returned frames
3445          * so userspace can register for those to know whether ones
3446          * it transmitted were processed or returned.
3447          */
3448
3449         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3450             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3451                 sig = status->signal;
3452
3453         if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3454                                  ieee80211_rx_status_to_khz(status), sig,
3455                                  rx->skb->data, rx->skb->len, 0)) {
3456                 if (rx->sta)
3457                         rx->sta->rx_stats.packets++;
3458                 dev_kfree_skb(rx->skb);
3459                 return RX_QUEUED;
3460         }
3461
3462         return RX_CONTINUE;
3463 }
3464
3465 static ieee80211_rx_result debug_noinline
3466 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3467 {
3468         struct ieee80211_sub_if_data *sdata = rx->sdata;
3469         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3470         int len = rx->skb->len;
3471
3472         if (!ieee80211_is_action(mgmt->frame_control))
3473                 return RX_CONTINUE;
3474
3475         switch (mgmt->u.action.category) {
3476         case WLAN_CATEGORY_SA_QUERY:
3477                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3478                            sizeof(mgmt->u.action.u.sa_query)))
3479                         break;
3480
3481                 switch (mgmt->u.action.u.sa_query.action) {
3482                 case WLAN_ACTION_SA_QUERY_REQUEST:
3483                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3484                                 break;
3485                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3486                         goto handled;
3487                 }
3488                 break;
3489         }
3490
3491         return RX_CONTINUE;
3492
3493  handled:
3494         if (rx->sta)
3495                 rx->sta->rx_stats.packets++;
3496         dev_kfree_skb(rx->skb);
3497         return RX_QUEUED;
3498 }
3499
3500 static ieee80211_rx_result debug_noinline
3501 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3502 {
3503         struct ieee80211_local *local = rx->local;
3504         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3505         struct sk_buff *nskb;
3506         struct ieee80211_sub_if_data *sdata = rx->sdata;
3507         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3508
3509         if (!ieee80211_is_action(mgmt->frame_control))
3510                 return RX_CONTINUE;
3511
3512         /*
3513          * For AP mode, hostapd is responsible for handling any action
3514          * frames that we didn't handle, including returning unknown
3515          * ones. For all other modes we will return them to the sender,
3516          * setting the 0x80 bit in the action category, as required by
3517          * 802.11-2012 9.24.4.
3518          * Newer versions of hostapd shall also use the management frame
3519          * registration mechanisms, but older ones still use cooked
3520          * monitor interfaces so push all frames there.
3521          */
3522         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3523             (sdata->vif.type == NL80211_IFTYPE_AP ||
3524              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3525                 return RX_DROP_MONITOR;
3526
3527         if (is_multicast_ether_addr(mgmt->da))
3528                 return RX_DROP_MONITOR;
3529
3530         /* do not return rejected action frames */
3531         if (mgmt->u.action.category & 0x80)
3532                 return RX_DROP_UNUSABLE;
3533
3534         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3535                                GFP_ATOMIC);
3536         if (nskb) {
3537                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3538
3539                 nmgmt->u.action.category |= 0x80;
3540                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3541                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3542
3543                 memset(nskb->cb, 0, sizeof(nskb->cb));
3544
3545                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3546                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3547
3548                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3549                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3550                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3551                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3552                                 info->hw_queue =
3553                                         local->hw.offchannel_tx_hw_queue;
3554                 }
3555
3556                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3557                                             status->band);
3558         }
3559         dev_kfree_skb(rx->skb);
3560         return RX_QUEUED;
3561 }
3562
3563 static ieee80211_rx_result debug_noinline
3564 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3565 {
3566         struct ieee80211_sub_if_data *sdata = rx->sdata;
3567         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3568
3569         if (!ieee80211_is_ext(hdr->frame_control))
3570                 return RX_CONTINUE;
3571
3572         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3573                 return RX_DROP_MONITOR;
3574
3575         /* for now only beacons are ext, so queue them */
3576         skb_queue_tail(&sdata->skb_queue, rx->skb);
3577         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3578         if (rx->sta)
3579                 rx->sta->rx_stats.packets++;
3580
3581         return RX_QUEUED;
3582 }
3583
3584 static ieee80211_rx_result debug_noinline
3585 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3586 {
3587         struct ieee80211_sub_if_data *sdata = rx->sdata;
3588         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3589         __le16 stype;
3590
3591         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3592
3593         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3594             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3595             sdata->vif.type != NL80211_IFTYPE_OCB &&
3596             sdata->vif.type != NL80211_IFTYPE_STATION)
3597                 return RX_DROP_MONITOR;
3598
3599         switch (stype) {
3600         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3601         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3602         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3603                 /* process for all: mesh, mlme, ibss */
3604                 break;
3605         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3606                 if (is_multicast_ether_addr(mgmt->da) &&
3607                     !is_broadcast_ether_addr(mgmt->da))
3608                         return RX_DROP_MONITOR;
3609
3610                 /* process only for station/IBSS */
3611                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3612                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3613                         return RX_DROP_MONITOR;
3614                 break;
3615         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3616         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3617         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3618                 if (is_multicast_ether_addr(mgmt->da) &&
3619                     !is_broadcast_ether_addr(mgmt->da))
3620                         return RX_DROP_MONITOR;
3621
3622                 /* process only for station */
3623                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3624                         return RX_DROP_MONITOR;
3625                 break;
3626         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3627                 /* process only for ibss and mesh */
3628                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3629                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3630                         return RX_DROP_MONITOR;
3631                 break;
3632         default:
3633                 return RX_DROP_MONITOR;
3634         }
3635
3636         /* queue up frame and kick off work to process it */
3637         skb_queue_tail(&sdata->skb_queue, rx->skb);
3638         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3639         if (rx->sta)
3640                 rx->sta->rx_stats.packets++;
3641
3642         return RX_QUEUED;
3643 }
3644
3645 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3646                                         struct ieee80211_rate *rate)
3647 {
3648         struct ieee80211_sub_if_data *sdata;
3649         struct ieee80211_local *local = rx->local;
3650         struct sk_buff *skb = rx->skb, *skb2;
3651         struct net_device *prev_dev = NULL;
3652         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3653         int needed_headroom;
3654
3655         /*
3656          * If cooked monitor has been processed already, then
3657          * don't do it again. If not, set the flag.
3658          */
3659         if (rx->flags & IEEE80211_RX_CMNTR)
3660                 goto out_free_skb;
3661         rx->flags |= IEEE80211_RX_CMNTR;
3662
3663         /* If there are no cooked monitor interfaces, just free the SKB */
3664         if (!local->cooked_mntrs)
3665                 goto out_free_skb;
3666
3667         /* vendor data is long removed here */
3668         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3669         /* room for the radiotap header based on driver features */
3670         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3671
3672         if (skb_headroom(skb) < needed_headroom &&
3673             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3674                 goto out_free_skb;
3675
3676         /* prepend radiotap information */
3677         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3678                                          false);
3679
3680         skb_reset_mac_header(skb);
3681         skb->ip_summed = CHECKSUM_UNNECESSARY;
3682         skb->pkt_type = PACKET_OTHERHOST;
3683         skb->protocol = htons(ETH_P_802_2);
3684
3685         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3686                 if (!ieee80211_sdata_running(sdata))
3687                         continue;
3688
3689                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3690                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3691                         continue;
3692
3693                 if (prev_dev) {
3694                         skb2 = skb_clone(skb, GFP_ATOMIC);
3695                         if (skb2) {
3696                                 skb2->dev = prev_dev;
3697                                 netif_receive_skb(skb2);
3698                         }
3699                 }
3700
3701                 prev_dev = sdata->dev;
3702                 ieee80211_rx_stats(sdata->dev, skb->len);
3703         }
3704
3705         if (prev_dev) {
3706                 skb->dev = prev_dev;
3707                 netif_receive_skb(skb);
3708                 return;
3709         }
3710
3711  out_free_skb:
3712         dev_kfree_skb(skb);
3713 }
3714
3715 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3716                                          ieee80211_rx_result res)
3717 {
3718         switch (res) {
3719         case RX_DROP_MONITOR:
3720                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3721                 if (rx->sta)
3722                         rx->sta->rx_stats.dropped++;
3723                 fallthrough;
3724         case RX_CONTINUE: {
3725                 struct ieee80211_rate *rate = NULL;
3726                 struct ieee80211_supported_band *sband;
3727                 struct ieee80211_rx_status *status;
3728
3729                 status = IEEE80211_SKB_RXCB((rx->skb));
3730
3731                 sband = rx->local->hw.wiphy->bands[status->band];
3732                 if (status->encoding == RX_ENC_LEGACY)
3733                         rate = &sband->bitrates[status->rate_idx];
3734
3735                 ieee80211_rx_cooked_monitor(rx, rate);
3736                 break;
3737                 }
3738         case RX_DROP_UNUSABLE:
3739                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3740                 if (rx->sta)
3741                         rx->sta->rx_stats.dropped++;
3742                 dev_kfree_skb(rx->skb);
3743                 break;
3744         case RX_QUEUED:
3745                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3746                 break;
3747         }
3748 }
3749
3750 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3751                                   struct sk_buff_head *frames)
3752 {
3753         ieee80211_rx_result res = RX_DROP_MONITOR;
3754         struct sk_buff *skb;
3755
3756 #define CALL_RXH(rxh)                   \
3757         do {                            \
3758                 res = rxh(rx);          \
3759                 if (res != RX_CONTINUE) \
3760                         goto rxh_next;  \
3761         } while (0)
3762
3763         /* Lock here to avoid hitting all of the data used in the RX
3764          * path (e.g. key data, station data, ...) concurrently when
3765          * a frame is released from the reorder buffer due to timeout
3766          * from the timer, potentially concurrently with RX from the
3767          * driver.
3768          */
3769         spin_lock_bh(&rx->local->rx_path_lock);
3770
3771         while ((skb = __skb_dequeue(frames))) {
3772                 /*
3773                  * all the other fields are valid across frames
3774                  * that belong to an aMPDU since they are on the
3775                  * same TID from the same station
3776                  */
3777                 rx->skb = skb;
3778
3779                 CALL_RXH(ieee80211_rx_h_check_more_data);
3780                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3781                 CALL_RXH(ieee80211_rx_h_sta_process);
3782                 CALL_RXH(ieee80211_rx_h_decrypt);
3783                 CALL_RXH(ieee80211_rx_h_defragment);
3784                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3785                 /* must be after MMIC verify so header is counted in MPDU mic */
3786 #ifdef CONFIG_MAC80211_MESH
3787                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3788                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3789 #endif
3790                 CALL_RXH(ieee80211_rx_h_amsdu);
3791                 CALL_RXH(ieee80211_rx_h_data);
3792
3793                 /* special treatment -- needs the queue */
3794                 res = ieee80211_rx_h_ctrl(rx, frames);
3795                 if (res != RX_CONTINUE)
3796                         goto rxh_next;
3797
3798                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3799                 CALL_RXH(ieee80211_rx_h_action);
3800                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3801                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3802                 CALL_RXH(ieee80211_rx_h_action_return);
3803                 CALL_RXH(ieee80211_rx_h_ext);
3804                 CALL_RXH(ieee80211_rx_h_mgmt);
3805
3806  rxh_next:
3807                 ieee80211_rx_handlers_result(rx, res);
3808
3809 #undef CALL_RXH
3810         }
3811
3812         spin_unlock_bh(&rx->local->rx_path_lock);
3813 }
3814
3815 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3816 {
3817         struct sk_buff_head reorder_release;
3818         ieee80211_rx_result res = RX_DROP_MONITOR;
3819
3820         __skb_queue_head_init(&reorder_release);
3821
3822 #define CALL_RXH(rxh)                   \
3823         do {                            \
3824                 res = rxh(rx);          \
3825                 if (res != RX_CONTINUE) \
3826                         goto rxh_next;  \
3827         } while (0)
3828
3829         CALL_RXH(ieee80211_rx_h_check_dup);
3830         CALL_RXH(ieee80211_rx_h_check);
3831
3832         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3833
3834         ieee80211_rx_handlers(rx, &reorder_release);
3835         return;
3836
3837  rxh_next:
3838         ieee80211_rx_handlers_result(rx, res);
3839
3840 #undef CALL_RXH
3841 }
3842
3843 /*
3844  * This function makes calls into the RX path, therefore
3845  * it has to be invoked under RCU read lock.
3846  */
3847 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3848 {
3849         struct sk_buff_head frames;
3850         struct ieee80211_rx_data rx = {
3851                 .sta = sta,
3852                 .sdata = sta->sdata,
3853                 .local = sta->local,
3854                 /* This is OK -- must be QoS data frame */
3855                 .security_idx = tid,
3856                 .seqno_idx = tid,
3857         };
3858         struct tid_ampdu_rx *tid_agg_rx;
3859
3860         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3861         if (!tid_agg_rx)
3862                 return;
3863
3864         __skb_queue_head_init(&frames);
3865
3866         spin_lock(&tid_agg_rx->reorder_lock);
3867         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3868         spin_unlock(&tid_agg_rx->reorder_lock);
3869
3870         if (!skb_queue_empty(&frames)) {
3871                 struct ieee80211_event event = {
3872                         .type = BA_FRAME_TIMEOUT,
3873                         .u.ba.tid = tid,
3874                         .u.ba.sta = &sta->sta,
3875                 };
3876                 drv_event_callback(rx.local, rx.sdata, &event);
3877         }
3878
3879         ieee80211_rx_handlers(&rx, &frames);
3880 }
3881
3882 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3883                                           u16 ssn, u64 filtered,
3884                                           u16 received_mpdus)
3885 {
3886         struct sta_info *sta;
3887         struct tid_ampdu_rx *tid_agg_rx;
3888         struct sk_buff_head frames;
3889         struct ieee80211_rx_data rx = {
3890                 /* This is OK -- must be QoS data frame */
3891                 .security_idx = tid,
3892                 .seqno_idx = tid,
3893         };
3894         int i, diff;
3895
3896         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3897                 return;
3898
3899         __skb_queue_head_init(&frames);
3900
3901         sta = container_of(pubsta, struct sta_info, sta);
3902
3903         rx.sta = sta;
3904         rx.sdata = sta->sdata;
3905         rx.local = sta->local;
3906
3907         rcu_read_lock();
3908         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3909         if (!tid_agg_rx)
3910                 goto out;
3911
3912         spin_lock_bh(&tid_agg_rx->reorder_lock);
3913
3914         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3915                 int release;
3916
3917                 /* release all frames in the reorder buffer */
3918                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3919                            IEEE80211_SN_MODULO;
3920                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3921                                                  release, &frames);
3922                 /* update ssn to match received ssn */
3923                 tid_agg_rx->head_seq_num = ssn;
3924         } else {
3925                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3926                                                  &frames);
3927         }
3928
3929         /* handle the case that received ssn is behind the mac ssn.
3930          * it can be tid_agg_rx->buf_size behind and still be valid */
3931         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3932         if (diff >= tid_agg_rx->buf_size) {
3933                 tid_agg_rx->reorder_buf_filtered = 0;
3934                 goto release;
3935         }
3936         filtered = filtered >> diff;
3937         ssn += diff;
3938
3939         /* update bitmap */
3940         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3941                 int index = (ssn + i) % tid_agg_rx->buf_size;
3942
3943                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3944                 if (filtered & BIT_ULL(i))
3945                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3946         }
3947
3948         /* now process also frames that the filter marking released */
3949         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3950
3951 release:
3952         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3953
3954         ieee80211_rx_handlers(&rx, &frames);
3955
3956  out:
3957         rcu_read_unlock();
3958 }
3959 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3960
3961 /* main receive path */
3962
3963 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3964 {
3965         struct ieee80211_sub_if_data *sdata = rx->sdata;
3966         struct sk_buff *skb = rx->skb;
3967         struct ieee80211_hdr *hdr = (void *)skb->data;
3968         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3969         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3970         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
3971                          ieee80211_is_s1g_beacon(hdr->frame_control);
3972
3973         switch (sdata->vif.type) {
3974         case NL80211_IFTYPE_STATION:
3975                 if (!bssid && !sdata->u.mgd.use_4addr)
3976                         return false;
3977                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3978                         return false;
3979                 if (multicast)
3980                         return true;
3981                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3982         case NL80211_IFTYPE_ADHOC:
3983                 if (!bssid)
3984                         return false;
3985                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3986                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3987                         return false;
3988                 if (ieee80211_is_beacon(hdr->frame_control))
3989                         return true;
3990                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3991                         return false;
3992                 if (!multicast &&
3993                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3994                         return false;
3995                 if (!rx->sta) {
3996                         int rate_idx;
3997                         if (status->encoding != RX_ENC_LEGACY)
3998                                 rate_idx = 0; /* TODO: HT/VHT rates */
3999                         else
4000                                 rate_idx = status->rate_idx;
4001                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4002                                                  BIT(rate_idx));
4003                 }
4004                 return true;
4005         case NL80211_IFTYPE_OCB:
4006                 if (!bssid)
4007                         return false;
4008                 if (!ieee80211_is_data_present(hdr->frame_control))
4009                         return false;
4010                 if (!is_broadcast_ether_addr(bssid))
4011                         return false;
4012                 if (!multicast &&
4013                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4014                         return false;
4015                 if (!rx->sta) {
4016                         int rate_idx;
4017                         if (status->encoding != RX_ENC_LEGACY)
4018                                 rate_idx = 0; /* TODO: HT rates */
4019                         else
4020                                 rate_idx = status->rate_idx;
4021                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4022                                                 BIT(rate_idx));
4023                 }
4024                 return true;
4025         case NL80211_IFTYPE_MESH_POINT:
4026                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4027                         return false;
4028                 if (multicast)
4029                         return true;
4030                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4031         case NL80211_IFTYPE_AP_VLAN:
4032         case NL80211_IFTYPE_AP:
4033                 if (!bssid)
4034                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4035
4036                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4037                         /*
4038                          * Accept public action frames even when the
4039                          * BSSID doesn't match, this is used for P2P
4040                          * and location updates. Note that mac80211
4041                          * itself never looks at these frames.
4042                          */
4043                         if (!multicast &&
4044                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4045                                 return false;
4046                         if (ieee80211_is_public_action(hdr, skb->len))
4047                                 return true;
4048                         return ieee80211_is_beacon(hdr->frame_control);
4049                 }
4050
4051                 if (!ieee80211_has_tods(hdr->frame_control)) {
4052                         /* ignore data frames to TDLS-peers */
4053                         if (ieee80211_is_data(hdr->frame_control))
4054                                 return false;
4055                         /* ignore action frames to TDLS-peers */
4056                         if (ieee80211_is_action(hdr->frame_control) &&
4057                             !is_broadcast_ether_addr(bssid) &&
4058                             !ether_addr_equal(bssid, hdr->addr1))
4059                                 return false;
4060                 }
4061
4062                 /*
4063                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4064                  * the BSSID - we've checked that already but may have accepted
4065                  * the wildcard (ff:ff:ff:ff:ff:ff).
4066                  *
4067                  * It also says:
4068                  *      The BSSID of the Data frame is determined as follows:
4069                  *      a) If the STA is contained within an AP or is associated
4070                  *         with an AP, the BSSID is the address currently in use
4071                  *         by the STA contained in the AP.
4072                  *
4073                  * So we should not accept data frames with an address that's
4074                  * multicast.
4075                  *
4076                  * Accepting it also opens a security problem because stations
4077                  * could encrypt it with the GTK and inject traffic that way.
4078                  */
4079                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4080                         return false;
4081
4082                 return true;
4083         case NL80211_IFTYPE_WDS:
4084                 if (bssid || !ieee80211_is_data(hdr->frame_control))
4085                         return false;
4086                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
4087         case NL80211_IFTYPE_P2P_DEVICE:
4088                 return ieee80211_is_public_action(hdr, skb->len) ||
4089                        ieee80211_is_probe_req(hdr->frame_control) ||
4090                        ieee80211_is_probe_resp(hdr->frame_control) ||
4091                        ieee80211_is_beacon(hdr->frame_control);
4092         case NL80211_IFTYPE_NAN:
4093                 /* Currently no frames on NAN interface are allowed */
4094                 return false;
4095         default:
4096                 break;
4097         }
4098
4099         WARN_ON_ONCE(1);
4100         return false;
4101 }
4102
4103 void ieee80211_check_fast_rx(struct sta_info *sta)
4104 {
4105         struct ieee80211_sub_if_data *sdata = sta->sdata;
4106         struct ieee80211_local *local = sdata->local;
4107         struct ieee80211_key *key;
4108         struct ieee80211_fast_rx fastrx = {
4109                 .dev = sdata->dev,
4110                 .vif_type = sdata->vif.type,
4111                 .control_port_protocol = sdata->control_port_protocol,
4112         }, *old, *new = NULL;
4113         bool assign = false;
4114
4115         /* use sparse to check that we don't return without updating */
4116         __acquire(check_fast_rx);
4117
4118         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4119         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4120         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4121         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4122
4123         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4124
4125         /* fast-rx doesn't do reordering */
4126         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4127             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4128                 goto clear;
4129
4130         switch (sdata->vif.type) {
4131         case NL80211_IFTYPE_STATION:
4132                 if (sta->sta.tdls) {
4133                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4134                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4135                         fastrx.expected_ds_bits = 0;
4136                 } else {
4137                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4138                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4139                         fastrx.expected_ds_bits =
4140                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4141                 }
4142
4143                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4144                         fastrx.expected_ds_bits |=
4145                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4146                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4147                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4148                 }
4149
4150                 if (!sdata->u.mgd.powersave)
4151                         break;
4152
4153                 /* software powersave is a huge mess, avoid all of it */
4154                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4155                         goto clear;
4156                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4157                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4158                         goto clear;
4159                 break;
4160         case NL80211_IFTYPE_AP_VLAN:
4161         case NL80211_IFTYPE_AP:
4162                 /* parallel-rx requires this, at least with calls to
4163                  * ieee80211_sta_ps_transition()
4164                  */
4165                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4166                         goto clear;
4167                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4168                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4169                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4170
4171                 fastrx.internal_forward =
4172                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4173                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4174                          !sdata->u.vlan.sta);
4175
4176                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4177                     sdata->u.vlan.sta) {
4178                         fastrx.expected_ds_bits |=
4179                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4180                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4181                         fastrx.internal_forward = 0;
4182                 }
4183
4184                 break;
4185         default:
4186                 goto clear;
4187         }
4188
4189         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4190                 goto clear;
4191
4192         rcu_read_lock();
4193         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4194         if (key) {
4195                 switch (key->conf.cipher) {
4196                 case WLAN_CIPHER_SUITE_TKIP:
4197                         /* we don't want to deal with MMIC in fast-rx */
4198                         goto clear_rcu;
4199                 case WLAN_CIPHER_SUITE_CCMP:
4200                 case WLAN_CIPHER_SUITE_CCMP_256:
4201                 case WLAN_CIPHER_SUITE_GCMP:
4202                 case WLAN_CIPHER_SUITE_GCMP_256:
4203                         break;
4204                 default:
4205                         /* We also don't want to deal with
4206                          * WEP or cipher scheme.
4207                          */
4208                         goto clear_rcu;
4209                 }
4210
4211                 fastrx.key = true;
4212                 fastrx.icv_len = key->conf.icv_len;
4213         }
4214
4215         assign = true;
4216  clear_rcu:
4217         rcu_read_unlock();
4218  clear:
4219         __release(check_fast_rx);
4220
4221         if (assign)
4222                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4223
4224         spin_lock_bh(&sta->lock);
4225         old = rcu_dereference_protected(sta->fast_rx, true);
4226         rcu_assign_pointer(sta->fast_rx, new);
4227         spin_unlock_bh(&sta->lock);
4228
4229         if (old)
4230                 kfree_rcu(old, rcu_head);
4231 }
4232
4233 void ieee80211_clear_fast_rx(struct sta_info *sta)
4234 {
4235         struct ieee80211_fast_rx *old;
4236
4237         spin_lock_bh(&sta->lock);
4238         old = rcu_dereference_protected(sta->fast_rx, true);
4239         RCU_INIT_POINTER(sta->fast_rx, NULL);
4240         spin_unlock_bh(&sta->lock);
4241
4242         if (old)
4243                 kfree_rcu(old, rcu_head);
4244 }
4245
4246 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4247 {
4248         struct ieee80211_local *local = sdata->local;
4249         struct sta_info *sta;
4250
4251         lockdep_assert_held(&local->sta_mtx);
4252
4253         list_for_each_entry(sta, &local->sta_list, list) {
4254                 if (sdata != sta->sdata &&
4255                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4256                         continue;
4257                 ieee80211_check_fast_rx(sta);
4258         }
4259 }
4260
4261 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4262 {
4263         struct ieee80211_local *local = sdata->local;
4264
4265         mutex_lock(&local->sta_mtx);
4266         __ieee80211_check_fast_rx_iface(sdata);
4267         mutex_unlock(&local->sta_mtx);
4268 }
4269
4270 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4271                                      struct ieee80211_fast_rx *fast_rx)
4272 {
4273         struct sk_buff *skb = rx->skb;
4274         struct ieee80211_hdr *hdr = (void *)skb->data;
4275         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4276         struct sta_info *sta = rx->sta;
4277         int orig_len = skb->len;
4278         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4279         int snap_offs = hdrlen;
4280         struct {
4281                 u8 snap[sizeof(rfc1042_header)];
4282                 __be16 proto;
4283         } *payload __aligned(2);
4284         struct {
4285                 u8 da[ETH_ALEN];
4286                 u8 sa[ETH_ALEN];
4287         } addrs __aligned(2);
4288         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4289
4290         if (fast_rx->uses_rss)
4291                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4292
4293         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4294          * to a common data structure; drivers can implement that per queue
4295          * but we don't have that information in mac80211
4296          */
4297         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4298                 return false;
4299
4300 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4301
4302         /* If using encryption, we also need to have:
4303          *  - PN_VALIDATED: similar, but the implementation is tricky
4304          *  - DECRYPTED: necessary for PN_VALIDATED
4305          */
4306         if (fast_rx->key &&
4307             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4308                 return false;
4309
4310         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4311                 return false;
4312
4313         if (unlikely(ieee80211_is_frag(hdr)))
4314                 return false;
4315
4316         /* Since our interface address cannot be multicast, this
4317          * implicitly also rejects multicast frames without the
4318          * explicit check.
4319          *
4320          * We shouldn't get any *data* frames not addressed to us
4321          * (AP mode will accept multicast *management* frames), but
4322          * punting here will make it go through the full checks in
4323          * ieee80211_accept_frame().
4324          */
4325         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4326                 return false;
4327
4328         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4329                                               IEEE80211_FCTL_TODS)) !=
4330             fast_rx->expected_ds_bits)
4331                 return false;
4332
4333         /* assign the key to drop unencrypted frames (later)
4334          * and strip the IV/MIC if necessary
4335          */
4336         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4337                 /* GCMP header length is the same */
4338                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4339         }
4340
4341         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4342                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4343                         goto drop;
4344
4345                 payload = (void *)(skb->data + snap_offs);
4346
4347                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4348                         return false;
4349
4350                 /* Don't handle these here since they require special code.
4351                  * Accept AARP and IPX even though they should come with a
4352                  * bridge-tunnel header - but if we get them this way then
4353                  * there's little point in discarding them.
4354                  */
4355                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4356                              payload->proto == fast_rx->control_port_protocol))
4357                         return false;
4358         }
4359
4360         /* after this point, don't punt to the slowpath! */
4361
4362         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4363             pskb_trim(skb, skb->len - fast_rx->icv_len))
4364                 goto drop;
4365
4366         /* statistics part of ieee80211_rx_h_sta_process() */
4367         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4368                 stats->last_signal = status->signal;
4369                 if (!fast_rx->uses_rss)
4370                         ewma_signal_add(&sta->rx_stats_avg.signal,
4371                                         -status->signal);
4372         }
4373
4374         if (status->chains) {
4375                 int i;
4376
4377                 stats->chains = status->chains;
4378                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4379                         int signal = status->chain_signal[i];
4380
4381                         if (!(status->chains & BIT(i)))
4382                                 continue;
4383
4384                         stats->chain_signal_last[i] = signal;
4385                         if (!fast_rx->uses_rss)
4386                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4387                                                 -signal);
4388                 }
4389         }
4390         /* end of statistics */
4391
4392         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4393                 goto drop;
4394
4395         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4396                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4397                     RX_QUEUED)
4398                         goto drop;
4399
4400                 return true;
4401         }
4402
4403         stats->last_rx = jiffies;
4404         stats->last_rate = sta_stats_encode_rate(status);
4405
4406         stats->fragments++;
4407         stats->packets++;
4408
4409         /* do the header conversion - first grab the addresses */
4410         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4411         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4412         /* remove the SNAP but leave the ethertype */
4413         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4414         /* push the addresses in front */
4415         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4416
4417         skb->dev = fast_rx->dev;
4418
4419         ieee80211_rx_stats(fast_rx->dev, skb->len);
4420
4421         /* The seqno index has the same property as needed
4422          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4423          * for non-QoS-data frames. Here we know it's a data
4424          * frame, so count MSDUs.
4425          */
4426         u64_stats_update_begin(&stats->syncp);
4427         stats->msdu[rx->seqno_idx]++;
4428         stats->bytes += orig_len;
4429         u64_stats_update_end(&stats->syncp);
4430
4431         if (fast_rx->internal_forward) {
4432                 struct sk_buff *xmit_skb = NULL;
4433                 if (is_multicast_ether_addr(addrs.da)) {
4434                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4435                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4436                            sta_info_get(rx->sdata, addrs.da)) {
4437                         xmit_skb = skb;
4438                         skb = NULL;
4439                 }
4440
4441                 if (xmit_skb) {
4442                         /*
4443                          * Send to wireless media and increase priority by 256
4444                          * to keep the received priority instead of
4445                          * reclassifying the frame (see cfg80211_classify8021d).
4446                          */
4447                         xmit_skb->priority += 256;
4448                         xmit_skb->protocol = htons(ETH_P_802_3);
4449                         skb_reset_network_header(xmit_skb);
4450                         skb_reset_mac_header(xmit_skb);
4451                         dev_queue_xmit(xmit_skb);
4452                 }
4453
4454                 if (!skb)
4455                         return true;
4456         }
4457
4458         /* deliver to local stack */
4459         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4460         memset(skb->cb, 0, sizeof(skb->cb));
4461         if (rx->list)
4462                 list_add_tail(&skb->list, rx->list);
4463         else
4464                 netif_receive_skb(skb);
4465
4466         return true;
4467  drop:
4468         dev_kfree_skb(skb);
4469         stats->dropped++;
4470         return true;
4471 }
4472
4473 /*
4474  * This function returns whether or not the SKB
4475  * was destined for RX processing or not, which,
4476  * if consume is true, is equivalent to whether
4477  * or not the skb was consumed.
4478  */
4479 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4480                                             struct sk_buff *skb, bool consume)
4481 {
4482         struct ieee80211_local *local = rx->local;
4483         struct ieee80211_sub_if_data *sdata = rx->sdata;
4484
4485         rx->skb = skb;
4486
4487         /* See if we can do fast-rx; if we have to copy we already lost,
4488          * so punt in that case. We should never have to deliver a data
4489          * frame to multiple interfaces anyway.
4490          *
4491          * We skip the ieee80211_accept_frame() call and do the necessary
4492          * checking inside ieee80211_invoke_fast_rx().
4493          */
4494         if (consume && rx->sta) {
4495                 struct ieee80211_fast_rx *fast_rx;
4496
4497                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4498                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4499                         return true;
4500         }
4501
4502         if (!ieee80211_accept_frame(rx))
4503                 return false;
4504
4505         if (!consume) {
4506                 skb = skb_copy(skb, GFP_ATOMIC);
4507                 if (!skb) {
4508                         if (net_ratelimit())
4509                                 wiphy_debug(local->hw.wiphy,
4510                                         "failed to copy skb for %s\n",
4511                                         sdata->name);
4512                         return true;
4513                 }
4514
4515                 rx->skb = skb;
4516         }
4517
4518         ieee80211_invoke_rx_handlers(rx);
4519         return true;
4520 }
4521
4522 /*
4523  * This is the actual Rx frames handler. as it belongs to Rx path it must
4524  * be called with rcu_read_lock protection.
4525  */
4526 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4527                                          struct ieee80211_sta *pubsta,
4528                                          struct sk_buff *skb,
4529                                          struct list_head *list)
4530 {
4531         struct ieee80211_local *local = hw_to_local(hw);
4532         struct ieee80211_sub_if_data *sdata;
4533         struct ieee80211_hdr *hdr;
4534         __le16 fc;
4535         struct ieee80211_rx_data rx;
4536         struct ieee80211_sub_if_data *prev;
4537         struct rhlist_head *tmp;
4538         int err = 0;
4539
4540         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4541         memset(&rx, 0, sizeof(rx));
4542         rx.skb = skb;
4543         rx.local = local;
4544         rx.list = list;
4545
4546         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4547                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4548
4549         if (ieee80211_is_mgmt(fc)) {
4550                 /* drop frame if too short for header */
4551                 if (skb->len < ieee80211_hdrlen(fc))
4552                         err = -ENOBUFS;
4553                 else
4554                         err = skb_linearize(skb);
4555         } else {
4556                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4557         }
4558
4559         if (err) {
4560                 dev_kfree_skb(skb);
4561                 return;
4562         }
4563
4564         hdr = (struct ieee80211_hdr *)skb->data;
4565         ieee80211_parse_qos(&rx);
4566         ieee80211_verify_alignment(&rx);
4567
4568         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4569                      ieee80211_is_beacon(hdr->frame_control) ||
4570                      ieee80211_is_s1g_beacon(hdr->frame_control)))
4571                 ieee80211_scan_rx(local, skb);
4572
4573         if (ieee80211_is_data(fc)) {
4574                 struct sta_info *sta, *prev_sta;
4575
4576                 if (pubsta) {
4577                         rx.sta = container_of(pubsta, struct sta_info, sta);
4578                         rx.sdata = rx.sta->sdata;
4579                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4580                                 return;
4581                         goto out;
4582                 }
4583
4584                 prev_sta = NULL;
4585
4586                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4587                         if (!prev_sta) {
4588                                 prev_sta = sta;
4589                                 continue;
4590                         }
4591
4592                         rx.sta = prev_sta;
4593                         rx.sdata = prev_sta->sdata;
4594                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4595
4596                         prev_sta = sta;
4597                 }
4598
4599                 if (prev_sta) {
4600                         rx.sta = prev_sta;
4601                         rx.sdata = prev_sta->sdata;
4602
4603                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4604                                 return;
4605                         goto out;
4606                 }
4607         }
4608
4609         prev = NULL;
4610
4611         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4612                 if (!ieee80211_sdata_running(sdata))
4613                         continue;
4614
4615                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4616                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4617                         continue;
4618
4619                 /*
4620                  * frame is destined for this interface, but if it's
4621                  * not also for the previous one we handle that after
4622                  * the loop to avoid copying the SKB once too much
4623                  */
4624
4625                 if (!prev) {
4626                         prev = sdata;
4627                         continue;
4628                 }
4629
4630                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4631                 rx.sdata = prev;
4632                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4633
4634                 prev = sdata;
4635         }
4636
4637         if (prev) {
4638                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4639                 rx.sdata = prev;
4640
4641                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4642                         return;
4643         }
4644
4645  out:
4646         dev_kfree_skb(skb);
4647 }
4648
4649 /*
4650  * This is the receive path handler. It is called by a low level driver when an
4651  * 802.11 MPDU is received from the hardware.
4652  */
4653 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4654                        struct sk_buff *skb, struct list_head *list)
4655 {
4656         struct ieee80211_local *local = hw_to_local(hw);
4657         struct ieee80211_rate *rate = NULL;
4658         struct ieee80211_supported_band *sband;
4659         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4660
4661         WARN_ON_ONCE(softirq_count() == 0);
4662
4663         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4664                 goto drop;
4665
4666         sband = local->hw.wiphy->bands[status->band];
4667         if (WARN_ON(!sband))
4668                 goto drop;
4669
4670         /*
4671          * If we're suspending, it is possible although not too likely
4672          * that we'd be receiving frames after having already partially
4673          * quiesced the stack. We can't process such frames then since
4674          * that might, for example, cause stations to be added or other
4675          * driver callbacks be invoked.
4676          */
4677         if (unlikely(local->quiescing || local->suspended))
4678                 goto drop;
4679
4680         /* We might be during a HW reconfig, prevent Rx for the same reason */
4681         if (unlikely(local->in_reconfig))
4682                 goto drop;
4683
4684         /*
4685          * The same happens when we're not even started,
4686          * but that's worth a warning.
4687          */
4688         if (WARN_ON(!local->started))
4689                 goto drop;
4690
4691         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4692                 /*
4693                  * Validate the rate, unless a PLCP error means that
4694                  * we probably can't have a valid rate here anyway.
4695                  */
4696
4697                 switch (status->encoding) {
4698                 case RX_ENC_HT:
4699                         /*
4700                          * rate_idx is MCS index, which can be [0-76]
4701                          * as documented on:
4702                          *
4703                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4704                          *
4705                          * Anything else would be some sort of driver or
4706                          * hardware error. The driver should catch hardware
4707                          * errors.
4708                          */
4709                         if (WARN(status->rate_idx > 76,
4710                                  "Rate marked as an HT rate but passed "
4711                                  "status->rate_idx is not "
4712                                  "an MCS index [0-76]: %d (0x%02x)\n",
4713                                  status->rate_idx,
4714                                  status->rate_idx))
4715                                 goto drop;
4716                         break;
4717                 case RX_ENC_VHT:
4718                         if (WARN_ONCE(status->rate_idx > 9 ||
4719                                       !status->nss ||
4720                                       status->nss > 8,
4721                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4722                                       status->rate_idx, status->nss))
4723                                 goto drop;
4724                         break;
4725                 case RX_ENC_HE:
4726                         if (WARN_ONCE(status->rate_idx > 11 ||
4727                                       !status->nss ||
4728                                       status->nss > 8,
4729                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4730                                       status->rate_idx, status->nss))
4731                                 goto drop;
4732                         break;
4733                 default:
4734                         WARN_ON_ONCE(1);
4735                         fallthrough;
4736                 case RX_ENC_LEGACY:
4737                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4738                                 goto drop;
4739                         rate = &sband->bitrates[status->rate_idx];
4740                 }
4741         }
4742
4743         status->rx_flags = 0;
4744
4745         /*
4746          * Frames with failed FCS/PLCP checksum are not returned,
4747          * all other frames are returned without radiotap header
4748          * if it was previously present.
4749          * Also, frames with less than 16 bytes are dropped.
4750          */
4751         skb = ieee80211_rx_monitor(local, skb, rate);
4752         if (!skb)
4753                 return;
4754
4755         ieee80211_tpt_led_trig_rx(local,
4756                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4757                         skb->len);
4758
4759         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
4760
4761         return;
4762  drop:
4763         kfree_skb(skb);
4764 }
4765 EXPORT_SYMBOL(ieee80211_rx_list);
4766
4767 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4768                        struct sk_buff *skb, struct napi_struct *napi)
4769 {
4770         struct sk_buff *tmp;
4771         LIST_HEAD(list);
4772
4773
4774         /*
4775          * key references and virtual interfaces are protected using RCU
4776          * and this requires that we are in a read-side RCU section during
4777          * receive processing
4778          */
4779         rcu_read_lock();
4780         ieee80211_rx_list(hw, pubsta, skb, &list);
4781         rcu_read_unlock();
4782
4783         if (!napi) {
4784                 netif_receive_skb_list(&list);
4785                 return;
4786         }
4787
4788         list_for_each_entry_safe(skb, tmp, &list, list) {
4789                 skb_list_del_init(skb);
4790                 napi_gro_receive(napi, skb);
4791         }
4792 }
4793 EXPORT_SYMBOL(ieee80211_rx_napi);
4794
4795 /* This is a version of the rx handler that can be called from hard irq
4796  * context. Post the skb on the queue and schedule the tasklet */
4797 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4798 {
4799         struct ieee80211_local *local = hw_to_local(hw);
4800
4801         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4802
4803         skb->pkt_type = IEEE80211_RX_MSG;
4804         skb_queue_tail(&local->skb_queue, skb);
4805         tasklet_schedule(&local->tasklet);
4806 }
4807 EXPORT_SYMBOL(ieee80211_rx_irqsafe);