net/mac80211/rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   9  * Copyright (C) 2018-2021 Intel Corporation
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <linux/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 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  46                                enum nl80211_iftype type)
  47 {
  48         __le16 fc = hdr->frame_control;
  49
  50         if (ieee80211_is_data(fc)) {
  51                 if (len < 24) /* drop incorrect hdr len (data) */
  52                         return NULL;
  53
  54                 if (ieee80211_has_a4(fc))
  55                         return NULL;
  56                 if (ieee80211_has_tods(fc))
  57                         return hdr->addr1;
  58                 if (ieee80211_has_fromds(fc))
  59                         return hdr->addr2;
  60
  61                 return hdr->addr3;
  62         }
  63
  64         if (ieee80211_is_mgmt(fc)) {
  65                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  66                         return NULL;
  67                 return hdr->addr3;
  68         }
  69
  70         if (ieee80211_is_ctl(fc)) {
  71                 if (ieee80211_is_pspoll(fc))
  72                         return hdr->addr1;
  73
  74                 if (ieee80211_is_back_req(fc)) {
  75                         switch (type) {
  76                         case NL80211_IFTYPE_STATION:
  77                                 return hdr->addr2;
  78                         case NL80211_IFTYPE_AP:
  79                         case NL80211_IFTYPE_AP_VLAN:
  80                                 return hdr->addr1;
  81                         default:
  82                                 break; /* fall through to the return */
  83                         }
  84                 }
  85         }
  86
  87         return NULL;
  88 }
  89
  90 /*
  91  * monitor mode reception
  92  *
  93  * This function cleans up the SKB, i.e. it removes all the stuff
  94  * only useful for monitoring.
  95  */
  96 static void remove_monitor_info(struct sk_buff *skb,
  97                                 unsigned int present_fcs_len,
  98                                 unsigned int rtap_space)
  99 {
 100         if (present_fcs_len)
 101                 __pskb_trim(skb, skb->len - present_fcs_len);
 102         __pskb_pull(skb, rtap_space);
 103 }
 104
 105 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 106                                      unsigned int rtap_space)
 107 {
 108         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 109         struct ieee80211_hdr *hdr;
 110
 111         hdr = (void *)(skb->data + rtap_space);
 112
 113         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 114                             RX_FLAG_FAILED_PLCP_CRC |
 115                             RX_FLAG_ONLY_MONITOR |
 116                             RX_FLAG_NO_PSDU))
 117                 return true;
 118
 119         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 120                 return true;
 121
 122         if (ieee80211_is_ctl(hdr->frame_control) &&
 123             !ieee80211_is_pspoll(hdr->frame_control) &&
 124             !ieee80211_is_back_req(hdr->frame_control))
 125                 return true;
 126
 127         return false;
 128 }
 129
 130 static int
 131 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 132                              struct ieee80211_rx_status *status,
 133                              struct sk_buff *skb)
 134 {
 135         int len;
 136
 137         /* always present fields */
 138         len = sizeof(struct ieee80211_radiotap_header) + 8;
 139
 140         /* allocate extra bitmaps */
 141         if (status->chains)
 142                 len += 4 * hweight8(status->chains);
 143         /* vendor presence bitmap */
 144         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 145                 len += 4;
 146
 147         if (ieee80211_have_rx_timestamp(status)) {
 148                 len = ALIGN(len, 8);
 149                 len += 8;
 150         }
 151         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 152                 len += 1;
 153
 154         /* antenna field, if we don't have per-chain info */
 155         if (!status->chains)
 156                 len += 1;
 157
 158         /* padding for RX_FLAGS if necessary */
 159         len = ALIGN(len, 2);
 160
 161         if (status->encoding == RX_ENC_HT) /* HT info */
 162                 len += 3;
 163
 164         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 165                 len = ALIGN(len, 4);
 166                 len += 8;
 167         }
 168
 169         if (status->encoding == RX_ENC_VHT) {
 170                 len = ALIGN(len, 2);
 171                 len += 12;
 172         }
 173
 174         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 175                 len = ALIGN(len, 8);
 176                 len += 12;
 177         }
 178
 179         if (status->encoding == RX_ENC_HE &&
 180             status->flag & RX_FLAG_RADIOTAP_HE) {
 181                 len = ALIGN(len, 2);
 182                 len += 12;
 183                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 184         }
 185
 186         if (status->encoding == RX_ENC_HE &&
 187             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 188                 len = ALIGN(len, 2);
 189                 len += 12;
 190                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 191         }
 192
 193         if (status->flag & RX_FLAG_NO_PSDU)
 194                 len += 1;
 195
 196         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 197                 len = ALIGN(len, 2);
 198                 len += 4;
 199                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 200         }
 201
 202         if (status->chains) {
 203                 /* antenna and antenna signal fields */
 204                 len += 2 * hweight8(status->chains);
 205         }
 206
 207         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 208                 struct ieee80211_vendor_radiotap *rtap;
 209                 int vendor_data_offset = 0;
 210
 211                 /*
 212                  * The position to look at depends on the existence (or non-
 213                  * existence) of other elements, so take that into account...
 214                  */
 215                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 216                         vendor_data_offset +=
 217                                 sizeof(struct ieee80211_radiotap_he);
 218                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 219                         vendor_data_offset +=
 220                                 sizeof(struct ieee80211_radiotap_he_mu);
 221                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 222                         vendor_data_offset +=
 223                                 sizeof(struct ieee80211_radiotap_lsig);
 224
 225                 rtap = (void *)&skb->data[vendor_data_offset];
 226
 227                 /* alignment for fixed 6-byte vendor data header */
 228                 len = ALIGN(len, 2);
 229                 /* vendor data header */
 230                 len += 6;
 231                 if (WARN_ON(rtap->align == 0))
 232                         rtap->align = 1;
 233                 len = ALIGN(len, rtap->align);
 234                 len += rtap->len + rtap->pad;
 235         }
 236
 237         return len;
 238 }
 239
 240 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 241                                          struct sk_buff *skb,
 242                                          int rtap_space)
 243 {
 244         struct {
 245                 struct ieee80211_hdr_3addr hdr;
 246                 u8 category;
 247                 u8 action_code;
 248         } __packed __aligned(2) action;
 249
 250         if (!sdata)
 251                 return;
 252
 253         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 254
 255         if (skb->len < rtap_space + sizeof(action) +
 256                        VHT_MUMIMO_GROUPS_DATA_LEN)
 257                 return;
 258
 259         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 260                 return;
 261
 262         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 263
 264         if (!ieee80211_is_action(action.hdr.frame_control))
 265                 return;
 266
 267         if (action.category != WLAN_CATEGORY_VHT)
 268                 return;
 269
 270         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 271                 return;
 272
 273         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 274                 return;
 275
 276         skb = skb_copy(skb, GFP_ATOMIC);
 277         if (!skb)
 278                 return;
 279
 280         skb_queue_tail(&sdata->skb_queue, skb);
 281         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 282 }
 283
 284 /*
 285  * ieee80211_add_rx_radiotap_header - add radiotap header
 286  *
 287  * add a radiotap header containing all the fields which the hardware provided.
 288  */
 289 static void
 290 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 291                                  struct sk_buff *skb,
 292                                  struct ieee80211_rate *rate,
 293                                  int rtap_len, bool has_fcs)
 294 {
 295         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 296         struct ieee80211_radiotap_header *rthdr;
 297         unsigned char *pos;
 298         __le32 *it_present;
 299         u32 it_present_val;
 300         u16 rx_flags = 0;
 301         u16 channel_flags = 0;
 302         int mpdulen, chain;
 303         unsigned long chains = status->chains;
 304         struct ieee80211_vendor_radiotap rtap = {};
 305         struct ieee80211_radiotap_he he = {};
 306         struct ieee80211_radiotap_he_mu he_mu = {};
 307         struct ieee80211_radiotap_lsig lsig = {};
 308
 309         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 310                 he = *(struct ieee80211_radiotap_he *)skb->data;
 311                 skb_pull(skb, sizeof(he));
 312                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 313         }
 314
 315         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 316                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 317                 skb_pull(skb, sizeof(he_mu));
 318         }
 319
 320         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 321                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 322                 skb_pull(skb, sizeof(lsig));
 323         }
 324
 325         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 326                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 327                 /* rtap.len and rtap.pad are undone immediately */
 328                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 329         }
 330
 331         mpdulen = skb->len;
 332         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 333                 mpdulen += FCS_LEN;
 334
 335         rthdr = skb_push(skb, rtap_len);
 336         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 337         it_present = &rthdr->it_present;
 338
 339         /* radiotap header, set always present flags */
 340         rthdr->it_len = cpu_to_le16(rtap_len);
 341         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 342                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 343                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 344
 345         if (!status->chains)
 346                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 347
 348         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 349                 it_present_val |=
 350                         BIT(IEEE80211_RADIOTAP_EXT) |
 351                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 352                 put_unaligned_le32(it_present_val, it_present);
 353                 it_present++;
 354                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 355                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 356         }
 357
 358         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 359                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 360                                   BIT(IEEE80211_RADIOTAP_EXT);
 361                 put_unaligned_le32(it_present_val, it_present);
 362                 it_present++;
 363                 it_present_val = rtap.present;
 364         }
 365
 366         put_unaligned_le32(it_present_val, it_present);
 367
 368         pos = (void *)(it_present + 1);
 369
 370         /* the order of the following fields is important */
 371
 372         /* IEEE80211_RADIOTAP_TSFT */
 373         if (ieee80211_have_rx_timestamp(status)) {
 374                 /* padding */
 375                 while ((pos - (u8 *)rthdr) & 7)
 376                         *pos++ = 0;
 377                 put_unaligned_le64(
 378                         ieee80211_calculate_rx_timestamp(local, status,
 379                                                          mpdulen, 0),
 380                         pos);
 381                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 382                 pos += 8;
 383         }
 384
 385         /* IEEE80211_RADIOTAP_FLAGS */
 386         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 387                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 388         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 389                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 390         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 391                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 392         pos++;
 393
 394         /* IEEE80211_RADIOTAP_RATE */
 395         if (!rate || status->encoding != RX_ENC_LEGACY) {
 396                 /*
 397                  * Without rate information don't add it. If we have,
 398                  * MCS information is a separate field in radiotap,
 399                  * added below. The byte here is needed as padding
 400                  * for the channel though, so initialise it to 0.
 401                  */
 402                 *pos = 0;
 403         } else {
 404                 int shift = 0;
 405                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 406                 if (status->bw == RATE_INFO_BW_10)
 407                         shift = 1;
 408                 else if (status->bw == RATE_INFO_BW_5)
 409                         shift = 2;
 410                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 411         }
 412         pos++;
 413
 414         /* IEEE80211_RADIOTAP_CHANNEL */
 415         put_unaligned_le16(status->freq, pos);
 416         pos += 2;
 417         if (status->bw == RATE_INFO_BW_10)
 418                 channel_flags |= IEEE80211_CHAN_HALF;
 419         else if (status->bw == RATE_INFO_BW_5)
 420                 channel_flags |= IEEE80211_CHAN_QUARTER;
 421
 422         if (status->band == NL80211_BAND_5GHZ ||
 423             status->band == NL80211_BAND_6GHZ)
 424                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 425         else if (status->encoding != RX_ENC_LEGACY)
 426                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 427         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 428                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 429         else if (rate)
 430                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 431         else
 432                 channel_flags |= IEEE80211_CHAN_2GHZ;
 433         put_unaligned_le16(channel_flags, pos);
 434         pos += 2;
 435
 436         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 437         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 438             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 439                 *pos = status->signal;
 440                 rthdr->it_present |=
 441                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 442                 pos++;
 443         }
 444
 445         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 446
 447         if (!status->chains) {
 448                 /* IEEE80211_RADIOTAP_ANTENNA */
 449                 *pos = status->antenna;
 450                 pos++;
 451         }
 452
 453         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 454
 455         /* IEEE80211_RADIOTAP_RX_FLAGS */
 456         /* ensure 2 byte alignment for the 2 byte field as required */
 457         if ((pos - (u8 *)rthdr) & 1)
 458                 *pos++ = 0;
 459         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 460                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 461         put_unaligned_le16(rx_flags, pos);
 462         pos += 2;
 463
 464         if (status->encoding == RX_ENC_HT) {
 465                 unsigned int stbc;
 466
 467                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 468                 *pos++ = local->hw.radiotap_mcs_details;
 469                 *pos = 0;
 470                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 471                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 472                 if (status->bw == RATE_INFO_BW_40)
 473                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 474                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 475                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 476                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 477                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 478                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 479                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 480                 pos++;
 481                 *pos++ = status->rate_idx;
 482         }
 483
 484         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 485                 u16 flags = 0;
 486
 487                 /* ensure 4 byte alignment */
 488                 while ((pos - (u8 *)rthdr) & 3)
 489                         pos++;
 490                 rthdr->it_present |=
 491                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 492                 put_unaligned_le32(status->ampdu_reference, pos);
 493                 pos += 4;
 494                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 495                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 496                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 497                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 498                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 499                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 500                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 501                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 502                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 503                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 504                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 505                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 506                 put_unaligned_le16(flags, pos);
 507                 pos += 2;
 508                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 509                         *pos++ = status->ampdu_delimiter_crc;
 510                 else
 511                         *pos++ = 0;
 512                 *pos++ = 0;
 513         }
 514
 515         if (status->encoding == RX_ENC_VHT) {
 516                 u16 known = local->hw.radiotap_vht_details;
 517
 518                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 519                 put_unaligned_le16(known, pos);
 520                 pos += 2;
 521                 /* flags */
 522                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 523                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 524                 /* in VHT, STBC is binary */
 525                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 526                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 527                 if (status->enc_flags & RX_ENC_FLAG_BF)
 528                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 529                 pos++;
 530                 /* bandwidth */
 531                 switch (status->bw) {
 532                 case RATE_INFO_BW_80:
 533                         *pos++ = 4;
 534                         break;
 535                 case RATE_INFO_BW_160:
 536                         *pos++ = 11;
 537                         break;
 538                 case RATE_INFO_BW_40:
 539                         *pos++ = 1;
 540                         break;
 541                 default:
 542                         *pos++ = 0;
 543                 }
 544                 /* MCS/NSS */
 545                 *pos = (status->rate_idx << 4) | status->nss;
 546                 pos += 4;
 547                 /* coding field */
 548                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 549                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 550                 pos++;
 551                 /* group ID */
 552                 pos++;
 553                 /* partial_aid */
 554                 pos += 2;
 555         }
 556
 557         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 558                 u16 accuracy = 0;
 559                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 560
 561                 rthdr->it_present |=
 562                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 563
 564                 /* ensure 8 byte alignment */
 565                 while ((pos - (u8 *)rthdr) & 7)
 566                         pos++;
 567
 568                 put_unaligned_le64(status->device_timestamp, pos);
 569                 pos += sizeof(u64);
 570
 571                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 572                         accuracy = local->hw.radiotap_timestamp.accuracy;
 573                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 574                 }
 575                 put_unaligned_le16(accuracy, pos);
 576                 pos += sizeof(u16);
 577
 578                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 579                 *pos++ = flags;
 580         }
 581
 582         if (status->encoding == RX_ENC_HE &&
 583             status->flag & RX_FLAG_RADIOTAP_HE) {
 584 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 585
 586                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 587                         he.data6 |= HE_PREP(DATA6_NSTS,
 588                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 589                                                       status->enc_flags));
 590                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 591                 } else {
 592                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 593                 }
 594
 595 #define CHECK_GI(s) \
 596         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 597                      (int)NL80211_RATE_INFO_HE_GI_##s)
 598
 599                 CHECK_GI(0_8);
 600                 CHECK_GI(1_6);
 601                 CHECK_GI(3_2);
 602
 603                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 604                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 605                 he.data3 |= HE_PREP(DATA3_CODING,
 606                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 607
 608                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 609
 610                 switch (status->bw) {
 611                 case RATE_INFO_BW_20:
 612                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 613                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 614                         break;
 615                 case RATE_INFO_BW_40:
 616                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 617                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 618                         break;
 619                 case RATE_INFO_BW_80:
 620                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 621                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 622                         break;
 623                 case RATE_INFO_BW_160:
 624                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 625                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 626                         break;
 627                 case RATE_INFO_BW_HE_RU:
 628 #define CHECK_RU_ALLOC(s) \
 629         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 630                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 631
 632                         CHECK_RU_ALLOC(26);
 633                         CHECK_RU_ALLOC(52);
 634                         CHECK_RU_ALLOC(106);
 635                         CHECK_RU_ALLOC(242);
 636                         CHECK_RU_ALLOC(484);
 637                         CHECK_RU_ALLOC(996);
 638                         CHECK_RU_ALLOC(2x996);
 639
 640                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 641                                             status->he_ru + 4);
 642                         break;
 643                 default:
 644                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 645                 }
 646
 647                 /* ensure 2 byte alignment */
 648                 while ((pos - (u8 *)rthdr) & 1)
 649                         pos++;
 650                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 651                 memcpy(pos, &he, sizeof(he));
 652                 pos += sizeof(he);
 653         }
 654
 655         if (status->encoding == RX_ENC_HE &&
 656             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 657                 /* ensure 2 byte alignment */
 658                 while ((pos - (u8 *)rthdr) & 1)
 659                         pos++;
 660                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 661                 memcpy(pos, &he_mu, sizeof(he_mu));
 662                 pos += sizeof(he_mu);
 663         }
 664
 665         if (status->flag & RX_FLAG_NO_PSDU) {
 666                 rthdr->it_present |=
 667                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 668                 *pos++ = status->zero_length_psdu_type;
 669         }
 670
 671         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 672                 /* ensure 2 byte alignment */
 673                 while ((pos - (u8 *)rthdr) & 1)
 674                         pos++;
 675                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 676                 memcpy(pos, &lsig, sizeof(lsig));
 677                 pos += sizeof(lsig);
 678         }
 679
 680         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 681                 *pos++ = status->chain_signal[chain];
 682                 *pos++ = chain;
 683         }
 684
 685         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 686                 /* ensure 2 byte alignment for the vendor field as required */
 687                 if ((pos - (u8 *)rthdr) & 1)
 688                         *pos++ = 0;
 689                 *pos++ = rtap.oui[0];
 690                 *pos++ = rtap.oui[1];
 691                 *pos++ = rtap.oui[2];
 692                 *pos++ = rtap.subns;
 693                 put_unaligned_le16(rtap.len, pos);
 694                 pos += 2;
 695                 /* align the actual payload as requested */
 696                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 697                         *pos++ = 0;
 698                 /* data (and possible padding) already follows */
 699         }
 700 }
 701
 702 static struct sk_buff *
 703 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 704                            struct sk_buff **origskb,
 705                            struct ieee80211_rate *rate,
 706                            int rtap_space, bool use_origskb)
 707 {
 708         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 709         int rt_hdrlen, needed_headroom;
 710         struct sk_buff *skb;
 711
 712         /* room for the radiotap header based on driver features */
 713         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 714         needed_headroom = rt_hdrlen - rtap_space;
 715
 716         if (use_origskb) {
 717                 /* only need to expand headroom if necessary */
 718                 skb = *origskb;
 719                 *origskb = NULL;
 720
 721                 /*
 722                  * This shouldn't trigger often because most devices have an
 723                  * RX header they pull before we get here, and that should
 724                  * be big enough for our radiotap information. We should
 725                  * probably export the length to drivers so that we can have
 726                  * them allocate enough headroom to start with.
 727                  */
 728                 if (skb_headroom(skb) < needed_headroom &&
 729                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 730                         dev_kfree_skb(skb);
 731                         return NULL;
 732                 }
 733         } else {
 734                 /*
 735                  * Need to make a copy and possibly remove radiotap header
 736                  * and FCS from the original.
 737                  */
 738                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 739
 740                 if (!skb)
 741                         return NULL;
 742         }
 743
 744         /* prepend radiotap information */
 745         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 746
 747         skb_reset_mac_header(skb);
 748         skb->ip_summed = CHECKSUM_UNNECESSARY;
 749         skb->pkt_type = PACKET_OTHERHOST;
 750         skb->protocol = htons(ETH_P_802_2);
 751
 752         return skb;
 753 }
 754
 755 /*
 756  * This function copies a received frame to all monitor interfaces and
 757  * returns a cleaned-up SKB that no longer includes the FCS nor the
 758  * radiotap header the driver might have added.
 759  */
 760 static struct sk_buff *
 761 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 762                      struct ieee80211_rate *rate)
 763 {
 764         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 765         struct ieee80211_sub_if_data *sdata;
 766         struct sk_buff *monskb = NULL;
 767         int present_fcs_len = 0;
 768         unsigned int rtap_space = 0;
 769         struct ieee80211_sub_if_data *monitor_sdata =
 770                 rcu_dereference(local->monitor_sdata);
 771         bool only_monitor = false;
 772         unsigned int min_head_len;
 773
 774         if (status->flag & RX_FLAG_RADIOTAP_HE)
 775                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 776
 777         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 778                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 779
 780         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 781                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 782
 783         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 784                 struct ieee80211_vendor_radiotap *rtap =
 785                         (void *)(origskb->data + rtap_space);
 786
 787                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 788         }
 789
 790         min_head_len = rtap_space;
 791
 792         /*
 793          * First, we may need to make a copy of the skb because
 794          *  (1) we need to modify it for radiotap (if not present), and
 795          *  (2) the other RX handlers will modify the skb we got.
 796          *
 797          * We don't need to, of course, if we aren't going to return
 798          * the SKB because it has a bad FCS/PLCP checksum.
 799          */
 800
 801         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 802                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 803                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 804                                 /* driver bug */
 805                                 WARN_ON(1);
 806                                 dev_kfree_skb(origskb);
 807                                 return NULL;
 808                         }
 809                         present_fcs_len = FCS_LEN;
 810                 }
 811
 812                 /* also consider the hdr->frame_control */
 813                 min_head_len += 2;
 814         }
 815
 816         /* ensure that the expected data elements are in skb head */
 817         if (!pskb_may_pull(origskb, min_head_len)) {
 818                 dev_kfree_skb(origskb);
 819                 return NULL;
 820         }
 821
 822         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 823
 824         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 825                 if (only_monitor) {
 826                         dev_kfree_skb(origskb);
 827                         return NULL;
 828                 }
 829
 830                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 831                 return origskb;
 832         }
 833
 834         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 835
 836         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 837                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 838                                                  &local->mon_list);
 839
 840                 if (!monskb)
 841                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 842                                                             rate, rtap_space,
 843                                                             only_monitor &&
 844                                                             last_monitor);
 845
 846                 if (monskb) {
 847                         struct sk_buff *skb;
 848
 849                         if (last_monitor) {
 850                                 skb = monskb;
 851                                 monskb = NULL;
 852                         } else {
 853                                 skb = skb_clone(monskb, GFP_ATOMIC);
 854                         }
 855
 856                         if (skb) {
 857                                 skb->dev = sdata->dev;
 858                                 ieee80211_rx_stats(skb->dev, skb->len);
 859                                 netif_receive_skb(skb);
 860                         }
 861                 }
 862
 863                 if (last_monitor)
 864                         break;
 865         }
 866
 867         /* this happens if last_monitor was erroneously false */
 868         dev_kfree_skb(monskb);
 869
 870         /* ditto */
 871         if (!origskb)
 872                 return NULL;
 873
 874         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 875         return origskb;
 876 }
 877
 878 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 879 {
 880         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 881         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 882         int tid, seqno_idx, security_idx;
 883
 884         /* does the frame have a qos control field? */
 885         if (ieee80211_is_data_qos(hdr->frame_control)) {
 886                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 887                 /* frame has qos control */
 888                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 889                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 890                         status->rx_flags |= IEEE80211_RX_AMSDU;
 891
 892                 seqno_idx = tid;
 893                 security_idx = tid;
 894         } else {
 895                 /*
 896                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 897                  *
 898                  *      Sequence numbers for management frames, QoS data
 899                  *      frames with a broadcast/multicast address in the
 900                  *      Address 1 field, and all non-QoS data frames sent
 901                  *      by QoS STAs are assigned using an additional single
 902                  *      modulo-4096 counter, [...]
 903                  *
 904                  * We also use that counter for non-QoS STAs.
 905                  */
 906                 seqno_idx = IEEE80211_NUM_TIDS;
 907                 security_idx = 0;
 908                 if (ieee80211_is_mgmt(hdr->frame_control))
 909                         security_idx = IEEE80211_NUM_TIDS;
 910                 tid = 0;
 911         }
 912
 913         rx->seqno_idx = seqno_idx;
 914         rx->security_idx = security_idx;
 915         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 916          * For now, set skb->priority to 0 for other cases. */
 917         rx->skb->priority = (tid > 7) ? 0 : tid;
 918 }
 919
 920 /**
 921  * DOC: Packet alignment
 922  *
 923  * Drivers always need to pass packets that are aligned to two-byte boundaries
 924  * to the stack.
 925  *
 926  * Additionally, should, if possible, align the payload data in a way that
 927  * guarantees that the contained IP header is aligned to a four-byte
 928  * boundary. In the case of regular frames, this simply means aligning the
 929  * payload to a four-byte boundary (because either the IP header is directly
 930  * contained, or IV/RFC1042 headers that have a length divisible by four are
 931  * in front of it).  If the payload data is not properly aligned and the
 932  * architecture doesn't support efficient unaligned operations, mac80211
 933  * will align the data.
 934  *
 935  * With A-MSDU frames, however, the payload data address must yield two modulo
 936  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 937  * push the IP header further back to a multiple of four again. Thankfully, the
 938  * specs were sane enough this time around to require padding each A-MSDU
 939  * subframe to a length that is a multiple of four.
 940  *
 941  * Padding like Atheros hardware adds which is between the 802.11 header and
 942  * the payload is not supported, the driver is required to move the 802.11
 943  * header to be directly in front of the payload in that case.
 944  */
 945 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 946 {
 947 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 948         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 949 #endif
 950 }
 951
 952
 953 /* rx handlers */
 954
 955 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 956 {
 957         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 958
 959         if (is_multicast_ether_addr(hdr->addr1))
 960                 return 0;
 961
 962         return ieee80211_is_robust_mgmt_frame(skb);
 963 }
 964
 965
 966 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 967 {
 968         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 969
 970         if (!is_multicast_ether_addr(hdr->addr1))
 971                 return 0;
 972
 973         return ieee80211_is_robust_mgmt_frame(skb);
 974 }
 975
 976
 977 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 978 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 979 {
 980         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 981         struct ieee80211_mmie *mmie;
 982         struct ieee80211_mmie_16 *mmie16;
 983
 984         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 985                 return -1;
 986
 987         if (!ieee80211_is_robust_mgmt_frame(skb))
 988                 return -1; /* not a robust management frame */
 989
 990         mmie = (struct ieee80211_mmie *)
 991                 (skb->data + skb->len - sizeof(*mmie));
 992         if (mmie->element_id == WLAN_EID_MMIE &&
 993             mmie->length == sizeof(*mmie) - 2)
 994                 return le16_to_cpu(mmie->key_id);
 995
 996         mmie16 = (struct ieee80211_mmie_16 *)
 997                 (skb->data + skb->len - sizeof(*mmie16));
 998         if (skb->len >= 24 + sizeof(*mmie16) &&
 999             mmie16->element_id == WLAN_EID_MMIE &&
1000             mmie16->length == sizeof(*mmie16) - 2)
1001                 return le16_to_cpu(mmie16->key_id);
1002
1003         return -1;
1004 }
1005
1006 static int ieee80211_get_keyid(struct sk_buff *skb,
1007                                const struct ieee80211_cipher_scheme *cs)
1008 {
1009         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1010         __le16 fc;
1011         int hdrlen;
1012         int minlen;
1013         u8 key_idx_off;
1014         u8 key_idx_shift;
1015         u8 keyid;
1016
1017         fc = hdr->frame_control;
1018         hdrlen = ieee80211_hdrlen(fc);
1019
1020         if (cs) {
1021                 minlen = hdrlen + cs->hdr_len;
1022                 key_idx_off = hdrlen + cs->key_idx_off;
1023                 key_idx_shift = cs->key_idx_shift;
1024         } else {
1025                 /* WEP, TKIP, CCMP and GCMP */
1026                 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1027                 key_idx_off = hdrlen + 3;
1028                 key_idx_shift = 6;
1029         }
1030
1031         if (unlikely(skb->len < minlen))
1032                 return -EINVAL;
1033
1034         skb_copy_bits(skb, key_idx_off, &keyid, 1);
1035
1036         if (cs)
1037                 keyid &= cs->key_idx_mask;
1038         keyid >>= key_idx_shift;
1039
1040         /* cs could use more than the usual two bits for the keyid */
1041         if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1042                 return -EINVAL;
1043
1044         return keyid;
1045 }
1046
1047 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1048 {
1049         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1050         char *dev_addr = rx->sdata->vif.addr;
1051
1052         if (ieee80211_is_data(hdr->frame_control)) {
1053                 if (is_multicast_ether_addr(hdr->addr1)) {
1054                         if (ieee80211_has_tods(hdr->frame_control) ||
1055                             !ieee80211_has_fromds(hdr->frame_control))
1056                                 return RX_DROP_MONITOR;
1057                         if (ether_addr_equal(hdr->addr3, dev_addr))
1058                                 return RX_DROP_MONITOR;
1059                 } else {
1060                         if (!ieee80211_has_a4(hdr->frame_control))
1061                                 return RX_DROP_MONITOR;
1062                         if (ether_addr_equal(hdr->addr4, dev_addr))
1063                                 return RX_DROP_MONITOR;
1064                 }
1065         }
1066
1067         /* If there is not an established peer link and this is not a peer link
1068          * establisment frame, beacon or probe, drop the frame.
1069          */
1070
1071         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1072                 struct ieee80211_mgmt *mgmt;
1073
1074                 if (!ieee80211_is_mgmt(hdr->frame_control))
1075                         return RX_DROP_MONITOR;
1076
1077                 if (ieee80211_is_action(hdr->frame_control)) {
1078                         u8 category;
1079
1080                         /* make sure category field is present */
1081                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1082                                 return RX_DROP_MONITOR;
1083
1084                         mgmt = (struct ieee80211_mgmt *)hdr;
1085                         category = mgmt->u.action.category;
1086                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1087                             category != WLAN_CATEGORY_SELF_PROTECTED)
1088                                 return RX_DROP_MONITOR;
1089                         return RX_CONTINUE;
1090                 }
1091
1092                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1093                     ieee80211_is_probe_resp(hdr->frame_control) ||
1094                     ieee80211_is_beacon(hdr->frame_control) ||
1095                     ieee80211_is_auth(hdr->frame_control))
1096                         return RX_CONTINUE;
1097
1098                 return RX_DROP_MONITOR;
1099         }
1100
1101         return RX_CONTINUE;
1102 }
1103
1104 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1105                                               int index)
1106 {
1107         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1108         struct sk_buff *tail = skb_peek_tail(frames);
1109         struct ieee80211_rx_status *status;
1110
1111         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1112                 return true;
1113
1114         if (!tail)
1115                 return false;
1116
1117         status = IEEE80211_SKB_RXCB(tail);
1118         if (status->flag & RX_FLAG_AMSDU_MORE)
1119                 return false;
1120
1121         return true;
1122 }
1123
1124 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1125                                             struct tid_ampdu_rx *tid_agg_rx,
1126                                             int index,
1127                                             struct sk_buff_head *frames)
1128 {
1129         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1130         struct sk_buff *skb;
1131         struct ieee80211_rx_status *status;
1132
1133         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1134
1135         if (skb_queue_empty(skb_list))
1136                 goto no_frame;
1137
1138         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1139                 __skb_queue_purge(skb_list);
1140                 goto no_frame;
1141         }
1142
1143         /* release frames from the reorder ring buffer */
1144         tid_agg_rx->stored_mpdu_num--;
1145         while ((skb = __skb_dequeue(skb_list))) {
1146                 status = IEEE80211_SKB_RXCB(skb);
1147                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1148                 __skb_queue_tail(frames, skb);
1149         }
1150
1151 no_frame:
1152         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1153         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1154 }
1155
1156 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1157                                              struct tid_ampdu_rx *tid_agg_rx,
1158                                              u16 head_seq_num,
1159                                              struct sk_buff_head *frames)
1160 {
1161         int index;
1162
1163         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1164
1165         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1166                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1167                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1168                                                 frames);
1169         }
1170 }
1171
1172 /*
1173  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1174  * the skb was added to the buffer longer than this time ago, the earlier
1175  * frames that have not yet been received are assumed to be lost and the skb
1176  * can be released for processing. This may also release other skb's from the
1177  * reorder buffer if there are no additional gaps between the frames.
1178  *
1179  * Callers must hold tid_agg_rx->reorder_lock.
1180  */
1181 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1182
1183 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1184                                           struct tid_ampdu_rx *tid_agg_rx,
1185                                           struct sk_buff_head *frames)
1186 {
1187         int index, i, j;
1188
1189         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1190
1191         /* release the buffer until next missing frame */
1192         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1193         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1194             tid_agg_rx->stored_mpdu_num) {
1195                 /*
1196                  * No buffers ready to be released, but check whether any
1197                  * frames in the reorder buffer have timed out.
1198                  */
1199                 int skipped = 1;
1200                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1201                      j = (j + 1) % tid_agg_rx->buf_size) {
1202                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1203                                 skipped++;
1204                                 continue;
1205                         }
1206                         if (skipped &&
1207                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1208                                         HT_RX_REORDER_BUF_TIMEOUT))
1209                                 goto set_release_timer;
1210
1211                         /* don't leave incomplete A-MSDUs around */
1212                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1213                              i = (i + 1) % tid_agg_rx->buf_size)
1214                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1215
1216                         ht_dbg_ratelimited(sdata,
1217                                            "release an RX reorder frame due to timeout on earlier frames\n");
1218                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1219                                                         frames);
1220
1221                         /*
1222                          * Increment the head seq# also for the skipped slots.
1223                          */
1224                         tid_agg_rx->head_seq_num =
1225                                 (tid_agg_rx->head_seq_num +
1226                                  skipped) & IEEE80211_SN_MASK;
1227                         skipped = 0;
1228                 }
1229         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1230                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1231                                                 frames);
1232                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1233         }
1234
1235         if (tid_agg_rx->stored_mpdu_num) {
1236                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1237
1238                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1239                      j = (j + 1) % tid_agg_rx->buf_size) {
1240                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1241                                 break;
1242                 }
1243
1244  set_release_timer:
1245
1246                 if (!tid_agg_rx->removed)
1247                         mod_timer(&tid_agg_rx->reorder_timer,
1248                                   tid_agg_rx->reorder_time[j] + 1 +
1249                                   HT_RX_REORDER_BUF_TIMEOUT);
1250         } else {
1251                 del_timer(&tid_agg_rx->reorder_timer);
1252         }
1253 }
1254
1255 /*
1256  * As this function belongs to the RX path it must be under
1257  * rcu_read_lock protection. It returns false if the frame
1258  * can be processed immediately, true if it was consumed.
1259  */
1260 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1261                                              struct tid_ampdu_rx *tid_agg_rx,
1262                                              struct sk_buff *skb,
1263                                              struct sk_buff_head *frames)
1264 {
1265         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1266         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1267         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1268         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1269         u16 head_seq_num, buf_size;
1270         int index;
1271         bool ret = true;
1272
1273         spin_lock(&tid_agg_rx->reorder_lock);
1274
1275         /*
1276          * Offloaded BA sessions have no known starting sequence number so pick
1277          * one from first Rxed frame for this tid after BA was started.
1278          */
1279         if (unlikely(tid_agg_rx->auto_seq)) {
1280                 tid_agg_rx->auto_seq = false;
1281                 tid_agg_rx->ssn = mpdu_seq_num;
1282                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1283         }
1284
1285         buf_size = tid_agg_rx->buf_size;
1286         head_seq_num = tid_agg_rx->head_seq_num;
1287
1288         /*
1289          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1290          * be reordered.
1291          */
1292         if (unlikely(!tid_agg_rx->started)) {
1293                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1294                         ret = false;
1295                         goto out;
1296                 }
1297                 tid_agg_rx->started = true;
1298         }
1299
1300         /* frame with out of date sequence number */
1301         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1302                 dev_kfree_skb(skb);
1303                 goto out;
1304         }
1305
1306         /*
1307          * If frame the sequence number exceeds our buffering window
1308          * size release some previous frames to make room for this one.
1309          */
1310         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1311                 head_seq_num = ieee80211_sn_inc(
1312                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1313                 /* release stored frames up to new head to stack */
1314                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1315                                                  head_seq_num, frames);
1316         }
1317
1318         /* Now the new frame is always in the range of the reordering buffer */
1319
1320         index = mpdu_seq_num % tid_agg_rx->buf_size;
1321
1322         /* check if we already stored this frame */
1323         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1324                 dev_kfree_skb(skb);
1325                 goto out;
1326         }
1327
1328         /*
1329          * If the current MPDU is in the right order and nothing else
1330          * is stored we can process it directly, no need to buffer it.
1331          * If it is first but there's something stored, we may be able
1332          * to release frames after this one.
1333          */
1334         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1335             tid_agg_rx->stored_mpdu_num == 0) {
1336                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1337                         tid_agg_rx->head_seq_num =
1338                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1339                 ret = false;
1340                 goto out;
1341         }
1342
1343         /* put the frame in the reordering buffer */
1344         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1345         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1346                 tid_agg_rx->reorder_time[index] = jiffies;
1347                 tid_agg_rx->stored_mpdu_num++;
1348                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1349         }
1350
1351  out:
1352         spin_unlock(&tid_agg_rx->reorder_lock);
1353         return ret;
1354 }
1355
1356 /*
1357  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1358  * true if the MPDU was buffered, false if it should be processed.
1359  */
1360 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1361                                        struct sk_buff_head *frames)
1362 {
1363         struct sk_buff *skb = rx->skb;
1364         struct ieee80211_local *local = rx->local;
1365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1366         struct sta_info *sta = rx->sta;
1367         struct tid_ampdu_rx *tid_agg_rx;
1368         u16 sc;
1369         u8 tid, ack_policy;
1370
1371         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1372             is_multicast_ether_addr(hdr->addr1))
1373                 goto dont_reorder;
1374
1375         /*
1376          * filter the QoS data rx stream according to
1377          * STA/TID and check if this STA/TID is on aggregation
1378          */
1379
1380         if (!sta)
1381                 goto dont_reorder;
1382
1383         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1384                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1385         tid = ieee80211_get_tid(hdr);
1386
1387         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1388         if (!tid_agg_rx) {
1389                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1390                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1391                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1392                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1393                                              WLAN_BACK_RECIPIENT,
1394                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1395                 goto dont_reorder;
1396         }
1397
1398         /* qos null data frames are excluded */
1399         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1400                 goto dont_reorder;
1401
1402         /* not part of a BA session */
1403         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1404                 goto dont_reorder;
1405
1406         /* new, potentially un-ordered, ampdu frame - process it */
1407
1408         /* reset session timer */
1409         if (tid_agg_rx->timeout)
1410                 tid_agg_rx->last_rx = jiffies;
1411
1412         /* if this mpdu is fragmented - terminate rx aggregation session */
1413         sc = le16_to_cpu(hdr->seq_ctrl);
1414         if (sc & IEEE80211_SCTL_FRAG) {
1415                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1416                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1417                 return;
1418         }
1419
1420         /*
1421          * No locking needed -- we will only ever process one
1422          * RX packet at a time, and thus own tid_agg_rx. All
1423          * other code manipulating it needs to (and does) make
1424          * sure that we cannot get to it any more before doing
1425          * anything with it.
1426          */
1427         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1428                                              frames))
1429                 return;
1430
1431  dont_reorder:
1432         __skb_queue_tail(frames, skb);
1433 }
1434
1435 static ieee80211_rx_result debug_noinline
1436 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1437 {
1438         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1439         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1440
1441         if (status->flag & RX_FLAG_DUP_VALIDATED)
1442                 return RX_CONTINUE;
1443
1444         /*
1445          * Drop duplicate 802.11 retransmissions
1446          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1447          */
1448
1449         if (rx->skb->len < 24)
1450                 return RX_CONTINUE;
1451
1452         if (ieee80211_is_ctl(hdr->frame_control) ||
1453             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1454             is_multicast_ether_addr(hdr->addr1))
1455                 return RX_CONTINUE;
1456
1457         if (!rx->sta)
1458                 return RX_CONTINUE;
1459
1460         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1461                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1462                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1463                 rx->sta->rx_stats.num_duplicates++;
1464                 return RX_DROP_UNUSABLE;
1465         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1466                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1467         }
1468
1469         return RX_CONTINUE;
1470 }
1471
1472 static ieee80211_rx_result debug_noinline
1473 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1474 {
1475         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1476
1477         /* Drop disallowed frame classes based on STA auth/assoc state;
1478          * IEEE 802.11, Chap 5.5.
1479          *
1480          * mac80211 filters only based on association state, i.e. it drops
1481          * Class 3 frames from not associated stations. hostapd sends
1482          * deauth/disassoc frames when needed. In addition, hostapd is
1483          * responsible for filtering on both auth and assoc states.
1484          */
1485
1486         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1487                 return ieee80211_rx_mesh_check(rx);
1488
1489         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1490                       ieee80211_is_pspoll(hdr->frame_control)) &&
1491                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1492                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1493                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1494                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1495                 /*
1496                  * accept port control frames from the AP even when it's not
1497                  * yet marked ASSOC to prevent a race where we don't set the
1498                  * assoc bit quickly enough before it sends the first frame
1499                  */
1500                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1501                     ieee80211_is_data_present(hdr->frame_control)) {
1502                         unsigned int hdrlen;
1503                         __be16 ethertype;
1504
1505                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1506
1507                         if (rx->skb->len < hdrlen + 8)
1508                                 return RX_DROP_MONITOR;
1509
1510                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1511                         if (ethertype == rx->sdata->control_port_protocol)
1512                                 return RX_CONTINUE;
1513                 }
1514
1515                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1516                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1517                                                hdr->addr2,
1518                                                GFP_ATOMIC))
1519                         return RX_DROP_UNUSABLE;
1520
1521                 return RX_DROP_MONITOR;
1522         }
1523
1524         return RX_CONTINUE;
1525 }
1526
1527
1528 static ieee80211_rx_result debug_noinline
1529 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1530 {
1531         struct ieee80211_local *local;
1532         struct ieee80211_hdr *hdr;
1533         struct sk_buff *skb;
1534
1535         local = rx->local;
1536         skb = rx->skb;
1537         hdr = (struct ieee80211_hdr *) skb->data;
1538
1539         if (!local->pspolling)
1540                 return RX_CONTINUE;
1541
1542         if (!ieee80211_has_fromds(hdr->frame_control))
1543                 /* this is not from AP */
1544                 return RX_CONTINUE;
1545
1546         if (!ieee80211_is_data(hdr->frame_control))
1547                 return RX_CONTINUE;
1548
1549         if (!ieee80211_has_moredata(hdr->frame_control)) {
1550                 /* AP has no more frames buffered for us */
1551                 local->pspolling = false;
1552                 return RX_CONTINUE;
1553         }
1554
1555         /* more data bit is set, let's request a new frame from the AP */
1556         ieee80211_send_pspoll(local, rx->sdata);
1557
1558         return RX_CONTINUE;
1559 }
1560
1561 static void sta_ps_start(struct sta_info *sta)
1562 {
1563         struct ieee80211_sub_if_data *sdata = sta->sdata;
1564         struct ieee80211_local *local = sdata->local;
1565         struct ps_data *ps;
1566         int tid;
1567
1568         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1569             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1570                 ps = &sdata->bss->ps;
1571         else
1572                 return;
1573
1574         atomic_inc(&ps->num_sta_ps);
1575         set_sta_flag(sta, WLAN_STA_PS_STA);
1576         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1577                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1578         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1579                sta->sta.addr, sta->sta.aid);
1580
1581         ieee80211_clear_fast_xmit(sta);
1582
1583         if (!sta->sta.txq[0])
1584                 return;
1585
1586         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1587                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1588                 struct txq_info *txqi = to_txq_info(txq);
1589
1590                 spin_lock(&local->active_txq_lock[txq->ac]);
1591                 if (!list_empty(&txqi->schedule_order))
1592                         list_del_init(&txqi->schedule_order);
1593                 spin_unlock(&local->active_txq_lock[txq->ac]);
1594
1595                 if (txq_has_queue(txq))
1596                         set_bit(tid, &sta->txq_buffered_tids);
1597                 else
1598                         clear_bit(tid, &sta->txq_buffered_tids);
1599         }
1600 }
1601
1602 static void sta_ps_end(struct sta_info *sta)
1603 {
1604         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1605                sta->sta.addr, sta->sta.aid);
1606
1607         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1608                 /*
1609                  * Clear the flag only if the other one is still set
1610                  * so that the TX path won't start TX'ing new frames
1611                  * directly ... In the case that the driver flag isn't
1612                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1613                  */
1614                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1615                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1616                        sta->sta.addr, sta->sta.aid);
1617                 return;
1618         }
1619
1620         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1621         clear_sta_flag(sta, WLAN_STA_PS_STA);
1622         ieee80211_sta_ps_deliver_wakeup(sta);
1623 }
1624
1625 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1626 {
1627         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1628         bool in_ps;
1629
1630         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1631
1632         /* Don't let the same PS state be set twice */
1633         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1634         if ((start && in_ps) || (!start && !in_ps))
1635                 return -EINVAL;
1636
1637         if (start)
1638                 sta_ps_start(sta);
1639         else
1640                 sta_ps_end(sta);
1641
1642         return 0;
1643 }
1644 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1645
1646 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1647 {
1648         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1649
1650         if (test_sta_flag(sta, WLAN_STA_SP))
1651                 return;
1652
1653         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1654                 ieee80211_sta_ps_deliver_poll_response(sta);
1655         else
1656                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1657 }
1658 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1659
1660 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1661 {
1662         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1663         int ac = ieee80211_ac_from_tid(tid);
1664
1665         /*
1666          * If this AC is not trigger-enabled do nothing unless the
1667          * driver is calling us after it already checked.
1668          *
1669          * NB: This could/should check a separate bitmap of trigger-
1670          * enabled queues, but for now we only implement uAPSD w/o
1671          * TSPEC changes to the ACs, so they're always the same.
1672          */
1673         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1674             tid != IEEE80211_NUM_TIDS)
1675                 return;
1676
1677         /* if we are in a service period, do nothing */
1678         if (test_sta_flag(sta, WLAN_STA_SP))
1679                 return;
1680
1681         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1682                 ieee80211_sta_ps_deliver_uapsd(sta);
1683         else
1684                 set_sta_flag(sta, WLAN_STA_UAPSD);
1685 }
1686 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1687
1688 static ieee80211_rx_result debug_noinline
1689 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1690 {
1691         struct ieee80211_sub_if_data *sdata = rx->sdata;
1692         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1693         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1694
1695         if (!rx->sta)
1696                 return RX_CONTINUE;
1697
1698         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1699             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1700                 return RX_CONTINUE;
1701
1702         /*
1703          * The device handles station powersave, so don't do anything about
1704          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1705          * it to mac80211 since they're handled.)
1706          */
1707         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1708                 return RX_CONTINUE;
1709
1710         /*
1711          * Don't do anything if the station isn't already asleep. In
1712          * the uAPSD case, the station will probably be marked asleep,
1713          * in the PS-Poll case the station must be confused ...
1714          */
1715         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1716                 return RX_CONTINUE;
1717
1718         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1719                 ieee80211_sta_pspoll(&rx->sta->sta);
1720
1721                 /* Free PS Poll skb here instead of returning RX_DROP that would
1722                  * count as an dropped frame. */
1723                 dev_kfree_skb(rx->skb);
1724
1725                 return RX_QUEUED;
1726         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1727                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1728                    ieee80211_has_pm(hdr->frame_control) &&
1729                    (ieee80211_is_data_qos(hdr->frame_control) ||
1730                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1731                 u8 tid = ieee80211_get_tid(hdr);
1732
1733                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1734         }
1735
1736         return RX_CONTINUE;
1737 }
1738
1739 static ieee80211_rx_result debug_noinline
1740 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1741 {
1742         struct sta_info *sta = rx->sta;
1743         struct sk_buff *skb = rx->skb;
1744         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1745         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1746         int i;
1747
1748         if (!sta)
1749                 return RX_CONTINUE;
1750
1751         /*
1752          * Update last_rx only for IBSS packets which are for the current
1753          * BSSID and for station already AUTHORIZED to avoid keeping the
1754          * current IBSS network alive in cases where other STAs start
1755          * using different BSSID. This will also give the station another
1756          * chance to restart the authentication/authorization in case
1757          * something went wrong the first time.
1758          */
1759         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1760                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1761                                                 NL80211_IFTYPE_ADHOC);
1762                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1763                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1764                         sta->rx_stats.last_rx = jiffies;
1765                         if (ieee80211_is_data(hdr->frame_control) &&
1766                             !is_multicast_ether_addr(hdr->addr1))
1767                                 sta->rx_stats.last_rate =
1768                                         sta_stats_encode_rate(status);
1769                 }
1770         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1771                 sta->rx_stats.last_rx = jiffies;
1772         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1773                 /*
1774                  * Mesh beacons will update last_rx when if they are found to
1775                  * match the current local configuration when processed.
1776                  */
1777                 sta->rx_stats.last_rx = jiffies;
1778                 if (ieee80211_is_data(hdr->frame_control))
1779                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1780         }
1781
1782         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1783                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1784
1785         sta->rx_stats.fragments++;
1786
1787         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1788         sta->rx_stats.bytes += rx->skb->len;
1789         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1790
1791         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1792                 sta->rx_stats.last_signal = status->signal;
1793                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1794         }
1795
1796         if (status->chains) {
1797                 sta->rx_stats.chains = status->chains;
1798                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1799                         int signal = status->chain_signal[i];
1800
1801                         if (!(status->chains & BIT(i)))
1802                                 continue;
1803
1804                         sta->rx_stats.chain_signal_last[i] = signal;
1805                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1806                                         -signal);
1807                 }
1808         }
1809
1810         /*
1811          * Change STA power saving mode only at the end of a frame
1812          * exchange sequence, and only for a data or management
1813          * frame as specified in IEEE 802.11-2016 11.2.3.2
1814          */
1815         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1816             !ieee80211_has_morefrags(hdr->frame_control) &&
1817             !is_multicast_ether_addr(hdr->addr1) &&
1818             (ieee80211_is_mgmt(hdr->frame_control) ||
1819              ieee80211_is_data(hdr->frame_control)) &&
1820             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1821             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1822              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1823                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1824                         if (!ieee80211_has_pm(hdr->frame_control))
1825                                 sta_ps_end(sta);
1826                 } else {
1827                         if (ieee80211_has_pm(hdr->frame_control))
1828                                 sta_ps_start(sta);
1829                 }
1830         }
1831
1832         /* mesh power save support */
1833         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1834                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1835
1836         /*
1837          * Drop (qos-)data::nullfunc frames silently, since they
1838          * are used only to control station power saving mode.
1839          */
1840         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1841                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1842
1843                 /*
1844                  * If we receive a 4-addr nullfunc frame from a STA
1845                  * that was not moved to a 4-addr STA vlan yet send
1846                  * the event to userspace and for older hostapd drop
1847                  * the frame to the monitor interface.
1848                  */
1849                 if (ieee80211_has_a4(hdr->frame_control) &&
1850                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1851                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1852                       !rx->sdata->u.vlan.sta))) {
1853                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1854                                 cfg80211_rx_unexpected_4addr_frame(
1855                                         rx->sdata->dev, sta->sta.addr,
1856                                         GFP_ATOMIC);
1857                         return RX_DROP_MONITOR;
1858                 }
1859                 /*
1860                  * Update counter and free packet here to avoid
1861                  * counting this as a dropped packed.
1862                  */
1863                 sta->rx_stats.packets++;
1864                 dev_kfree_skb(rx->skb);
1865                 return RX_QUEUED;
1866         }
1867
1868         return RX_CONTINUE;
1869 } /* ieee80211_rx_h_sta_process */
1870
1871 static ieee80211_rx_result debug_noinline
1872 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1873 {
1874         struct sk_buff *skb = rx->skb;
1875         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1876         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1877         int keyidx;
1878         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1879         struct ieee80211_key *sta_ptk = NULL;
1880         struct ieee80211_key *ptk_idx = NULL;
1881         int mmie_keyidx = -1;
1882         __le16 fc;
1883         const struct ieee80211_cipher_scheme *cs = NULL;
1884
1885         /*
1886          * Key selection 101
1887          *
1888          * There are four types of keys:
1889          *  - GTK (group keys)
1890          *  - IGTK (group keys for management frames)
1891          *  - PTK (pairwise keys)
1892          *  - STK (station-to-station pairwise keys)
1893          *
1894          * When selecting a key, we have to distinguish between multicast
1895          * (including broadcast) and unicast frames, the latter can only
1896          * use PTKs and STKs while the former always use GTKs and IGTKs.
1897          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1898          * unicast frames can also use key indices like GTKs. Hence, if we
1899          * don't have a PTK/STK we check the key index for a WEP key.
1900          *
1901          * Note that in a regular BSS, multicast frames are sent by the
1902          * AP only, associated stations unicast the frame to the AP first
1903          * which then multicasts it on their behalf.
1904          *
1905          * There is also a slight problem in IBSS mode: GTKs are negotiated
1906          * with each station, that is something we don't currently handle.
1907          * The spec seems to expect that one negotiates the same key with
1908          * every station but there's no such requirement; VLANs could be
1909          * possible.
1910          */
1911
1912         /* start without a key */
1913         rx->key = NULL;
1914         fc = hdr->frame_control;
1915
1916         if (rx->sta) {
1917                 int keyid = rx->sta->ptk_idx;
1918                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1919
1920                 if (ieee80211_has_protected(fc) &&
1921                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1922                         cs = rx->sta->cipher_scheme;
1923                         keyid = ieee80211_get_keyid(rx->skb, cs);
1924
1925                         if (unlikely(keyid < 0))
1926                                 return RX_DROP_UNUSABLE;
1927
1928                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1929                 }
1930         }
1931
1932         if (!ieee80211_has_protected(fc))
1933                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1934
1935         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1936                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1937                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1938                     (status->flag & RX_FLAG_IV_STRIPPED))
1939                         return RX_CONTINUE;
1940                 /* Skip decryption if the frame is not protected. */
1941                 if (!ieee80211_has_protected(fc))
1942                         return RX_CONTINUE;
1943         } else if (mmie_keyidx >= 0) {
1944                 /* Broadcast/multicast robust management frame / BIP */
1945                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1946                     (status->flag & RX_FLAG_IV_STRIPPED))
1947                         return RX_CONTINUE;
1948
1949                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1950                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1951                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1952                 if (rx->sta) {
1953                         if (ieee80211_is_group_privacy_action(skb) &&
1954                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1955                                 return RX_DROP_MONITOR;
1956
1957                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1958                 }
1959                 if (!rx->key)
1960                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1961         } else if (!ieee80211_has_protected(fc)) {
1962                 /*
1963                  * The frame was not protected, so skip decryption. However, we
1964                  * need to set rx->key if there is a key that could have been
1965                  * used so that the frame may be dropped if encryption would
1966                  * have been expected.
1967                  */
1968                 struct ieee80211_key *key = NULL;
1969                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1970                 int i;
1971
1972                 if (ieee80211_is_mgmt(fc) &&
1973                     is_multicast_ether_addr(hdr->addr1) &&
1974                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1975                         rx->key = key;
1976                 else {
1977                         if (rx->sta) {
1978                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1979                                         key = rcu_dereference(rx->sta->gtk[i]);
1980                                         if (key)
1981                                                 break;
1982                                 }
1983                         }
1984                         if (!key) {
1985                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1986                                         key = rcu_dereference(sdata->keys[i]);
1987                                         if (key)
1988                                                 break;
1989                                 }
1990                         }
1991                         if (key)
1992                                 rx->key = key;
1993                 }
1994                 return RX_CONTINUE;
1995         } else {
1996                 /*
1997                  * The device doesn't give us the IV so we won't be
1998                  * able to look up the key. That's ok though, we
1999                  * don't need to decrypt the frame, we just won't
2000                  * be able to keep statistics accurate.
2001                  * Except for key threshold notifications, should
2002                  * we somehow allow the driver to tell us which key
2003                  * the hardware used if this flag is set?
2004                  */
2005                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2006                     (status->flag & RX_FLAG_IV_STRIPPED))
2007                         return RX_CONTINUE;
2008
2009                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2010
2011                 if (unlikely(keyidx < 0))
2012                         return RX_DROP_UNUSABLE;
2013
2014                 /* check per-station GTK first, if multicast packet */
2015                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2016                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2017
2018                 /* if not found, try default key */
2019                 if (!rx->key) {
2020                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2021
2022                         /*
2023                          * RSNA-protected unicast frames should always be
2024                          * sent with pairwise or station-to-station keys,
2025                          * but for WEP we allow using a key index as well.
2026                          */
2027                         if (rx->key &&
2028                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2029                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2030                             !is_multicast_ether_addr(hdr->addr1))
2031                                 rx->key = NULL;
2032                 }
2033         }
2034
2035         if (rx->key) {
2036                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2037                         return RX_DROP_MONITOR;
2038
2039                 /* TODO: add threshold stuff again */
2040         } else {
2041                 return RX_DROP_MONITOR;
2042         }
2043
2044         switch (rx->key->conf.cipher) {
2045         case WLAN_CIPHER_SUITE_WEP40:
2046         case WLAN_CIPHER_SUITE_WEP104:
2047                 result = ieee80211_crypto_wep_decrypt(rx);
2048                 break;
2049         case WLAN_CIPHER_SUITE_TKIP:
2050                 result = ieee80211_crypto_tkip_decrypt(rx);
2051                 break;
2052         case WLAN_CIPHER_SUITE_CCMP:
2053                 result = ieee80211_crypto_ccmp_decrypt(
2054                         rx, IEEE80211_CCMP_MIC_LEN);
2055                 break;
2056         case WLAN_CIPHER_SUITE_CCMP_256:
2057                 result = ieee80211_crypto_ccmp_decrypt(
2058                         rx, IEEE80211_CCMP_256_MIC_LEN);
2059                 break;
2060         case WLAN_CIPHER_SUITE_AES_CMAC:
2061                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2062                 break;
2063         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2064                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2065                 break;
2066         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2067         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2068                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2069                 break;
2070         case WLAN_CIPHER_SUITE_GCMP:
2071         case WLAN_CIPHER_SUITE_GCMP_256:
2072                 result = ieee80211_crypto_gcmp_decrypt(rx);
2073                 break;
2074         default:
2075                 result = ieee80211_crypto_hw_decrypt(rx);
2076         }
2077
2078         /* the hdr variable is invalid after the decrypt handlers */
2079
2080         /* either the frame has been decrypted or will be dropped */
2081         status->flag |= RX_FLAG_DECRYPTED;
2082
2083         return result;
2084 }
2085
2086 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2087 {
2088         int i;
2089
2090         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2091                 skb_queue_head_init(&cache->entries[i].skb_list);
2092 }
2093
2094 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2095 {
2096         int i;
2097
2098         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2099                 __skb_queue_purge(&cache->entries[i].skb_list);
2100 }
2101
2102 static inline struct ieee80211_fragment_entry *
2103 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2104                          unsigned int frag, unsigned int seq, int rx_queue,
2105                          struct sk_buff **skb)
2106 {
2107         struct ieee80211_fragment_entry *entry;
2108
2109         entry = &cache->entries[cache->next++];
2110         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2111                 cache->next = 0;
2112
2113         __skb_queue_purge(&entry->skb_list);
2114
2115         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2116         *skb = NULL;
2117         entry->first_frag_time = jiffies;
2118         entry->seq = seq;
2119         entry->rx_queue = rx_queue;
2120         entry->last_frag = frag;
2121         entry->check_sequential_pn = false;
2122         entry->extra_len = 0;
2123
2124         return entry;
2125 }
2126
2127 static inline struct ieee80211_fragment_entry *
2128 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2129                           unsigned int frag, unsigned int seq,
2130                           int rx_queue, struct ieee80211_hdr *hdr)
2131 {
2132         struct ieee80211_fragment_entry *entry;
2133         int i, idx;
2134
2135         idx = cache->next;
2136         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2137                 struct ieee80211_hdr *f_hdr;
2138                 struct sk_buff *f_skb;
2139
2140                 idx--;
2141                 if (idx < 0)
2142                         idx = IEEE80211_FRAGMENT_MAX - 1;
2143
2144                 entry = &cache->entries[idx];
2145                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2146                     entry->rx_queue != rx_queue ||
2147                     entry->last_frag + 1 != frag)
2148                         continue;
2149
2150                 f_skb = __skb_peek(&entry->skb_list);
2151                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2152
2153                 /*
2154                  * Check ftype and addresses are equal, else check next fragment
2155                  */
2156                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2157                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2158                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2159                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2160                         continue;
2161
2162                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2163                         __skb_queue_purge(&entry->skb_list);
2164                         continue;
2165                 }
2166                 return entry;
2167         }
2168
2169         return NULL;
2170 }
2171
2172 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2173 {
2174         return rx->key &&
2175                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2176                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2177                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2178                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2179                 ieee80211_has_protected(fc);
2180 }
2181
2182 static ieee80211_rx_result debug_noinline
2183 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2184 {
2185         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2186         struct ieee80211_hdr *hdr;
2187         u16 sc;
2188         __le16 fc;
2189         unsigned int frag, seq;
2190         struct ieee80211_fragment_entry *entry;
2191         struct sk_buff *skb;
2192         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2193
2194         hdr = (struct ieee80211_hdr *)rx->skb->data;
2195         fc = hdr->frame_control;
2196
2197         if (ieee80211_is_ctl(fc))
2198                 return RX_CONTINUE;
2199
2200         sc = le16_to_cpu(hdr->seq_ctrl);
2201         frag = sc & IEEE80211_SCTL_FRAG;
2202
2203         if (rx->sta)
2204                 cache = &rx->sta->frags;
2205
2206         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2207                 goto out;
2208
2209         if (is_multicast_ether_addr(hdr->addr1))
2210                 return RX_DROP_MONITOR;
2211
2212         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2213
2214         if (skb_linearize(rx->skb))
2215                 return RX_DROP_UNUSABLE;
2216
2217         /*
2218          *  skb_linearize() might change the skb->data and
2219          *  previously cached variables (in this case, hdr) need to
2220          *  be refreshed with the new data.
2221          */
2222         hdr = (struct ieee80211_hdr *)rx->skb->data;
2223         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2224
2225         if (frag == 0) {
2226                 /* This is the first fragment of a new frame. */
2227                 entry = ieee80211_reassemble_add(cache, frag, seq,
2228                                                  rx->seqno_idx, &(rx->skb));
2229                 if (requires_sequential_pn(rx, fc)) {
2230                         int queue = rx->security_idx;
2231
2232                         /* Store CCMP/GCMP PN so that we can verify that the
2233                          * next fragment has a sequential PN value.
2234                          */
2235                         entry->check_sequential_pn = true;
2236                         entry->is_protected = true;
2237                         entry->key_color = rx->key->color;
2238                         memcpy(entry->last_pn,
2239                                rx->key->u.ccmp.rx_pn[queue],
2240                                IEEE80211_CCMP_PN_LEN);
2241                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2242                                               u.ccmp.rx_pn) !=
2243                                      offsetof(struct ieee80211_key,
2244                                               u.gcmp.rx_pn));
2245                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2246                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2247                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2248                                      IEEE80211_GCMP_PN_LEN);
2249                 } else if (rx->key &&
2250                            (ieee80211_has_protected(fc) ||
2251                             (status->flag & RX_FLAG_DECRYPTED))) {
2252                         entry->is_protected = true;
2253                         entry->key_color = rx->key->color;
2254                 }
2255                 return RX_QUEUED;
2256         }
2257
2258         /* This is a fragment for a frame that should already be pending in
2259          * fragment cache. Add this fragment to the end of the pending entry.
2260          */
2261         entry = ieee80211_reassemble_find(cache, frag, seq,
2262                                           rx->seqno_idx, hdr);
2263         if (!entry) {
2264                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2265                 return RX_DROP_MONITOR;
2266         }
2267
2268         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2269          *  MPDU PN values are not incrementing in steps of 1."
2270          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2271          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2272          */
2273         if (entry->check_sequential_pn) {
2274                 int i;
2275                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2276
2277                 if (!requires_sequential_pn(rx, fc))
2278                         return RX_DROP_UNUSABLE;
2279
2280                 /* Prevent mixed key and fragment cache attacks */
2281                 if (entry->key_color != rx->key->color)
2282                         return RX_DROP_UNUSABLE;
2283
2284                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2285                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2286                         pn[i]++;
2287                         if (pn[i])
2288                                 break;
2289                 }
2290
2291                 rpn = rx->ccm_gcm.pn;
2292                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2293                         return RX_DROP_UNUSABLE;
2294                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2295         } else if (entry->is_protected &&
2296                    (!rx->key ||
2297                     (!ieee80211_has_protected(fc) &&
2298                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2299                     rx->key->color != entry->key_color)) {
2300                 /* Drop this as a mixed key or fragment cache attack, even
2301                  * if for TKIP Michael MIC should protect us, and WEP is a
2302                  * lost cause anyway.
2303                  */
2304                 return RX_DROP_UNUSABLE;
2305         } else if (entry->is_protected && rx->key &&
2306                    entry->key_color != rx->key->color &&
2307                    (status->flag & RX_FLAG_DECRYPTED)) {
2308                 return RX_DROP_UNUSABLE;
2309         }
2310
2311         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2312         __skb_queue_tail(&entry->skb_list, rx->skb);
2313         entry->last_frag = frag;
2314         entry->extra_len += rx->skb->len;
2315         if (ieee80211_has_morefrags(fc)) {
2316                 rx->skb = NULL;
2317                 return RX_QUEUED;
2318         }
2319
2320         rx->skb = __skb_dequeue(&entry->skb_list);
2321         if (skb_tailroom(rx->skb) < entry->extra_len) {
2322                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2323                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2324                                               GFP_ATOMIC))) {
2325                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2326                         __skb_queue_purge(&entry->skb_list);
2327                         return RX_DROP_UNUSABLE;
2328                 }
2329         }
2330         while ((skb = __skb_dequeue(&entry->skb_list))) {
2331                 skb_put_data(rx->skb, skb->data, skb->len);
2332                 dev_kfree_skb(skb);
2333         }
2334
2335  out:
2336         ieee80211_led_rx(rx->local);
2337         if (rx->sta)
2338                 rx->sta->rx_stats.packets++;
2339         return RX_CONTINUE;
2340 }
2341
2342 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2343 {
2344         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2345                 return -EACCES;
2346
2347         return 0;
2348 }
2349
2350 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2351 {
2352         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2353         struct sk_buff *skb = rx->skb;
2354         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2355
2356         /*
2357          * Pass through unencrypted frames if the hardware has
2358          * decrypted them already.
2359          */
2360         if (status->flag & RX_FLAG_DECRYPTED)
2361                 return 0;
2362
2363         /* check mesh EAPOL frames first */
2364         if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2365                      ieee80211_is_data(fc))) {
2366                 struct ieee80211s_hdr *mesh_hdr;
2367                 u16 hdr_len = ieee80211_hdrlen(fc);
2368                 u16 ethertype_offset;
2369                 __be16 ethertype;
2370
2371                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2372                         goto drop_check;
2373
2374                 /* make sure fixed part of mesh header is there, also checks skb len */
2375                 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2376                         goto drop_check;
2377
2378                 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2379                 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2380                                    sizeof(rfc1042_header);
2381
2382                 if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
2383                     ethertype == rx->sdata->control_port_protocol)
2384                         return 0;
2385         }
2386
2387 drop_check:
2388         /* Drop unencrypted frames if key is set. */
2389         if (unlikely(!ieee80211_has_protected(fc) &&
2390                      !ieee80211_is_any_nullfunc(fc) &&
2391                      ieee80211_is_data(fc) && rx->key))
2392                 return -EACCES;
2393
2394         return 0;
2395 }
2396
2397 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2398 {
2399         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2400         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2401         __le16 fc = hdr->frame_control;
2402
2403         /*
2404          * Pass through unencrypted frames if the hardware has
2405          * decrypted them already.
2406          */
2407         if (status->flag & RX_FLAG_DECRYPTED)
2408                 return 0;
2409
2410         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2411                 if (unlikely(!ieee80211_has_protected(fc) &&
2412                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2413                              rx->key)) {
2414                         if (ieee80211_is_deauth(fc) ||
2415                             ieee80211_is_disassoc(fc))
2416                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2417                                                              rx->skb->data,
2418                                                              rx->skb->len);
2419                         return -EACCES;
2420                 }
2421                 /* BIP does not use Protected field, so need to check MMIE */
2422                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2423                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2424                         if (ieee80211_is_deauth(fc) ||
2425                             ieee80211_is_disassoc(fc))
2426                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2427                                                              rx->skb->data,
2428                                                              rx->skb->len);
2429                         return -EACCES;
2430                 }
2431                 /*
2432                  * When using MFP, Action frames are not allowed prior to
2433                  * having configured keys.
2434                  */
2435                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2436                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2437                         return -EACCES;
2438         }
2439
2440         return 0;
2441 }
2442
2443 static int
2444 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2445 {
2446         struct ieee80211_sub_if_data *sdata = rx->sdata;
2447         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2448         bool check_port_control = false;
2449         struct ethhdr *ehdr;
2450         int ret;
2451
2452         *port_control = false;
2453         if (ieee80211_has_a4(hdr->frame_control) &&
2454             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2455                 return -1;
2456
2457         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2458             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2459
2460                 if (!sdata->u.mgd.use_4addr)
2461                         return -1;
2462                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2463                         check_port_control = true;
2464         }
2465
2466         if (is_multicast_ether_addr(hdr->addr1) &&
2467             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2468                 return -1;
2469
2470         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2471         if (ret < 0)
2472                 return ret;
2473
2474         ehdr = (struct ethhdr *) rx->skb->data;
2475         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2476                 *port_control = true;
2477         else if (check_port_control)
2478                 return -1;
2479
2480         return 0;
2481 }
2482
2483 /*
2484  * requires that rx->skb is a frame with ethernet header
2485  */
2486 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2487 {
2488         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2489                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2490         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2491
2492         /*
2493          * Allow EAPOL frames to us/the PAE group address regardless of
2494          * whether the frame was encrypted or not, and always disallow
2495          * all other destination addresses for them.
2496          */
2497         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2498                 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2499                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2500
2501         if (ieee80211_802_1x_port_control(rx) ||
2502             ieee80211_drop_unencrypted(rx, fc))
2503                 return false;
2504
2505         return true;
2506 }
2507
2508 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2509                                                  struct ieee80211_rx_data *rx)
2510 {
2511         struct ieee80211_sub_if_data *sdata = rx->sdata;
2512         struct net_device *dev = sdata->dev;
2513
2514         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2515                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2516                      sdata->control_port_over_nl80211)) {
2517                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2518                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2519
2520                 cfg80211_rx_control_port(dev, skb, noencrypt);
2521                 dev_kfree_skb(skb);
2522         } else {
2523                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2524
2525                 memset(skb->cb, 0, sizeof(skb->cb));
2526
2527                 /*
2528                  * 802.1X over 802.11 requires that the authenticator address
2529                  * be used for EAPOL frames. However, 802.1X allows the use of
2530                  * the PAE group address instead. If the interface is part of
2531                  * a bridge and we pass the frame with the PAE group address,
2532                  * then the bridge will forward it to the network (even if the
2533                  * client was not associated yet), which isn't supposed to
2534                  * happen.
2535                  * To avoid that, rewrite the destination address to our own
2536                  * address, so that the authenticator (e.g. hostapd) will see
2537                  * the frame, but bridge won't forward it anywhere else. Note
2538                  * that due to earlier filtering, the only other address can
2539                  * be the PAE group address.
2540                  */
2541                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2542                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2543                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2544
2545                 /* deliver to local stack */
2546                 if (rx->napi)
2547                         napi_gro_receive(rx->napi, skb);
2548                 else
2549                         netif_receive_skb(skb);
2550         }
2551 }
2552
2553 /*
2554  * requires that rx->skb is a frame with ethernet header
2555  */
2556 static void
2557 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2558 {
2559         struct ieee80211_sub_if_data *sdata = rx->sdata;
2560         struct net_device *dev = sdata->dev;
2561         struct sk_buff *skb, *xmit_skb;
2562         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2563         struct sta_info *dsta;
2564
2565         skb = rx->skb;
2566         xmit_skb = NULL;
2567
2568         ieee80211_rx_stats(dev, skb->len);
2569
2570         if (rx->sta) {
2571                 /* The seqno index has the same property as needed
2572                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2573                  * for non-QoS-data frames. Here we know it's a data
2574                  * frame, so count MSDUs.
2575                  */
2576                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2577                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2578                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2579         }
2580
2581         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2582              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2583             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2584             ehdr->h_proto != rx->sdata->control_port_protocol &&
2585             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2586                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2587                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2588                         /*
2589                          * send multicast frames both to higher layers in
2590                          * local net stack and back to the wireless medium
2591                          */
2592                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2593                         if (!xmit_skb)
2594                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2595                                                     dev->name);
2596                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2597                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2598                         dsta = sta_info_get(sdata, ehdr->h_dest);
2599                         if (dsta) {
2600                                 /*
2601                                  * The destination station is associated to
2602                                  * this AP (in this VLAN), so send the frame
2603                                  * directly to it and do not pass it to local
2604                                  * net stack.
2605                                  */
2606                                 xmit_skb = skb;
2607                                 skb = NULL;
2608                         }
2609                 }
2610         }
2611
2612 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2613         if (skb) {
2614                 /* 'align' will only take the values 0 or 2 here since all
2615                  * frames are required to be aligned to 2-byte boundaries
2616                  * when being passed to mac80211; the code here works just
2617                  * as well if that isn't true, but mac80211 assumes it can
2618                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2619                  */
2620                 int align;
2621
2622                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2623                 if (align) {
2624                         if (WARN_ON(skb_headroom(skb) < 3)) {
2625                                 dev_kfree_skb(skb);
2626                                 skb = NULL;
2627                         } else {
2628                                 u8 *data = skb->data;
2629                                 size_t len = skb_headlen(skb);
2630                                 skb->data -= align;
2631                                 memmove(skb->data, data, len);
2632                                 skb_set_tail_pointer(skb, len);
2633                         }
2634                 }
2635         }
2636 #endif
2637
2638         if (skb) {
2639                 skb->protocol = eth_type_trans(skb, dev);
2640                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2641         }
2642
2643         if (xmit_skb) {
2644                 /*
2645                  * Send to wireless media and increase priority by 256 to
2646                  * keep the received priority instead of reclassifying
2647                  * the frame (see cfg80211_classify8021d).
2648                  */
2649                 xmit_skb->priority += 256;
2650                 xmit_skb->protocol = htons(ETH_P_802_3);
2651                 skb_reset_network_header(xmit_skb);
2652                 skb_reset_mac_header(xmit_skb);
2653                 dev_queue_xmit(xmit_skb);
2654         }
2655 }
2656
2657 static ieee80211_rx_result debug_noinline
2658 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2659 {
2660         struct net_device *dev = rx->sdata->dev;
2661         struct sk_buff *skb = rx->skb;
2662         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2663         __le16 fc = hdr->frame_control;
2664         struct sk_buff_head frame_list;
2665         struct ethhdr ethhdr;
2666         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2667
2668         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2669                 check_da = NULL;
2670                 check_sa = NULL;
2671         } else switch (rx->sdata->vif.type) {
2672                 case NL80211_IFTYPE_AP:
2673                 case NL80211_IFTYPE_AP_VLAN:
2674                         check_da = NULL;
2675                         break;
2676                 case NL80211_IFTYPE_STATION:
2677                         if (!rx->sta ||
2678                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2679                                 check_sa = NULL;
2680                         break;
2681                 case NL80211_IFTYPE_MESH_POINT:
2682                         check_sa = NULL;
2683                         break;
2684                 default:
2685                         break;
2686         }
2687
2688         skb->dev = dev;
2689         __skb_queue_head_init(&frame_list);
2690
2691         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2692                                           rx->sdata->vif.addr,
2693                                           rx->sdata->vif.type,
2694                                           data_offset, true))
2695                 return RX_DROP_UNUSABLE;
2696
2697         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2698                                  rx->sdata->vif.type,
2699                                  rx->local->hw.extra_tx_headroom,
2700                                  check_da, check_sa);
2701
2702         while (!skb_queue_empty(&frame_list)) {
2703                 rx->skb = __skb_dequeue(&frame_list);
2704
2705                 if (!ieee80211_frame_allowed(rx, fc)) {
2706                         dev_kfree_skb(rx->skb);
2707                         continue;
2708                 }
2709
2710                 ieee80211_deliver_skb(rx);
2711         }
2712
2713         return RX_QUEUED;
2714 }
2715
2716 static ieee80211_rx_result debug_noinline
2717 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2718 {
2719         struct sk_buff *skb = rx->skb;
2720         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2721         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2722         __le16 fc = hdr->frame_control;
2723
2724         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2725                 return RX_CONTINUE;
2726
2727         if (unlikely(!ieee80211_is_data(fc)))
2728                 return RX_CONTINUE;
2729
2730         if (unlikely(!ieee80211_is_data_present(fc)))
2731                 return RX_DROP_MONITOR;
2732
2733         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2734                 switch (rx->sdata->vif.type) {
2735                 case NL80211_IFTYPE_AP_VLAN:
2736                         if (!rx->sdata->u.vlan.sta)
2737                                 return RX_DROP_UNUSABLE;
2738                         break;
2739                 case NL80211_IFTYPE_STATION:
2740                         if (!rx->sdata->u.mgd.use_4addr)
2741                                 return RX_DROP_UNUSABLE;
2742                         break;
2743                 default:
2744                         return RX_DROP_UNUSABLE;
2745                 }
2746         }
2747
2748         if (is_multicast_ether_addr(hdr->addr1))
2749                 return RX_DROP_UNUSABLE;
2750
2751         if (rx->key) {
2752                 /*
2753                  * We should not receive A-MSDUs on pre-HT connections,
2754                  * and HT connections cannot use old ciphers. Thus drop
2755                  * them, as in those cases we couldn't even have SPP
2756                  * A-MSDUs or such.
2757                  */
2758                 switch (rx->key->conf.cipher) {
2759                 case WLAN_CIPHER_SUITE_WEP40:
2760                 case WLAN_CIPHER_SUITE_WEP104:
2761                 case WLAN_CIPHER_SUITE_TKIP:
2762                         return RX_DROP_UNUSABLE;
2763                 default:
2764                         break;
2765                 }
2766         }
2767
2768         return __ieee80211_rx_h_amsdu(rx, 0);
2769 }
2770
2771 #ifdef CONFIG_MAC80211_MESH
2772 static ieee80211_rx_result
2773 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2774 {
2775         struct ieee80211_hdr *fwd_hdr, *hdr;
2776         struct ieee80211_tx_info *info;
2777         struct ieee80211s_hdr *mesh_hdr;
2778         struct sk_buff *skb = rx->skb, *fwd_skb;
2779         struct ieee80211_local *local = rx->local;
2780         struct ieee80211_sub_if_data *sdata = rx->sdata;
2781         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2782         u16 ac, q, hdrlen;
2783         int tailroom = 0;
2784
2785         hdr = (struct ieee80211_hdr *) skb->data;
2786         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2787
2788         /* make sure fixed part of mesh header is there, also checks skb len */
2789         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2790                 return RX_DROP_MONITOR;
2791
2792         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2793
2794         /* make sure full mesh header is there, also checks skb len */
2795         if (!pskb_may_pull(rx->skb,
2796                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2797                 return RX_DROP_MONITOR;
2798
2799         /* reload pointers */
2800         hdr = (struct ieee80211_hdr *) skb->data;
2801         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2802
2803         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2804                 return RX_DROP_MONITOR;
2805
2806         /* frame is in RMC, don't forward */
2807         if (ieee80211_is_data(hdr->frame_control) &&
2808             is_multicast_ether_addr(hdr->addr1) &&
2809             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2810                 return RX_DROP_MONITOR;
2811
2812         if (!ieee80211_is_data(hdr->frame_control))
2813                 return RX_CONTINUE;
2814
2815         if (!mesh_hdr->ttl)
2816                 return RX_DROP_MONITOR;
2817
2818         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2819                 struct mesh_path *mppath;
2820                 char *proxied_addr;
2821                 char *mpp_addr;
2822
2823                 if (is_multicast_ether_addr(hdr->addr1)) {
2824                         mpp_addr = hdr->addr3;
2825                         proxied_addr = mesh_hdr->eaddr1;
2826                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2827                             MESH_FLAGS_AE_A5_A6) {
2828                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2829                         mpp_addr = hdr->addr4;
2830                         proxied_addr = mesh_hdr->eaddr2;
2831                 } else {
2832                         return RX_DROP_MONITOR;
2833                 }
2834
2835                 rcu_read_lock();
2836                 mppath = mpp_path_lookup(sdata, proxied_addr);
2837                 if (!mppath) {
2838                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2839                 } else {
2840                         spin_lock_bh(&mppath->state_lock);
2841                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2842                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2843                         mppath->exp_time = jiffies;
2844                         spin_unlock_bh(&mppath->state_lock);
2845                 }
2846                 rcu_read_unlock();
2847         }
2848
2849         /* Frame has reached destination.  Don't forward */
2850         if (!is_multicast_ether_addr(hdr->addr1) &&
2851             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2852                 return RX_CONTINUE;
2853
2854         ac = ieee802_1d_to_ac[skb->priority];
2855         q = sdata->vif.hw_queue[ac];
2856         if (ieee80211_queue_stopped(&local->hw, q)) {
2857                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2858                 return RX_DROP_MONITOR;
2859         }
2860         skb_set_queue_mapping(skb, ac);
2861
2862         if (!--mesh_hdr->ttl) {
2863                 if (!is_multicast_ether_addr(hdr->addr1))
2864                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2865                                                      dropped_frames_ttl);
2866                 goto out;
2867         }
2868
2869         if (!ifmsh->mshcfg.dot11MeshForwarding)
2870                 goto out;
2871
2872         if (sdata->crypto_tx_tailroom_needed_cnt)
2873                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2874
2875         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2876                                        sdata->encrypt_headroom,
2877                                   tailroom, GFP_ATOMIC);
2878         if (!fwd_skb)
2879                 goto out;
2880
2881         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2882         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2883         info = IEEE80211_SKB_CB(fwd_skb);
2884         memset(info, 0, sizeof(*info));
2885         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2886         info->control.vif = &rx->sdata->vif;
2887         info->control.jiffies = jiffies;
2888         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2889                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2890                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2891                 /* update power mode indication when forwarding */
2892                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2893         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2894                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2895                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2896         } else {
2897                 /* unable to resolve next hop */
2898                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2899                                    fwd_hdr->addr3, 0,
2900                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2901                                    fwd_hdr->addr2);
2902                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2903                 kfree_skb(fwd_skb);
2904                 return RX_DROP_MONITOR;
2905         }
2906
2907         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2908         ieee80211_add_pending_skb(local, fwd_skb);
2909  out:
2910         if (is_multicast_ether_addr(hdr->addr1))
2911                 return RX_CONTINUE;
2912         return RX_DROP_MONITOR;
2913 }
2914 #endif
2915
2916 static ieee80211_rx_result debug_noinline
2917 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2918 {
2919         struct ieee80211_sub_if_data *sdata = rx->sdata;
2920         struct ieee80211_local *local = rx->local;
2921         struct net_device *dev = sdata->dev;
2922         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2923         __le16 fc = hdr->frame_control;
2924         bool port_control;
2925         int err;
2926
2927         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2928                 return RX_CONTINUE;
2929
2930         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2931                 return RX_DROP_MONITOR;
2932
2933         /*
2934          * Send unexpected-4addr-frame event to hostapd. For older versions,
2935          * also drop the frame to cooked monitor interfaces.
2936          */
2937         if (ieee80211_has_a4(hdr->frame_control) &&
2938             sdata->vif.type == NL80211_IFTYPE_AP) {
2939                 if (rx->sta &&
2940                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2941                         cfg80211_rx_unexpected_4addr_frame(
2942                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2943                 return RX_DROP_MONITOR;
2944         }
2945
2946         err = __ieee80211_data_to_8023(rx, &port_control);
2947         if (unlikely(err))
2948                 return RX_DROP_UNUSABLE;
2949
2950         if (!ieee80211_frame_allowed(rx, fc))
2951                 return RX_DROP_MONITOR;
2952
2953         /* directly handle TDLS channel switch requests/responses */
2954         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2955                                                 cpu_to_be16(ETH_P_TDLS))) {
2956                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2957
2958                 if (pskb_may_pull(rx->skb,
2959                                   offsetof(struct ieee80211_tdls_data, u)) &&
2960                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2961                     tf->category == WLAN_CATEGORY_TDLS &&
2962                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2963                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2964                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2965                         schedule_work(&local->tdls_chsw_work);
2966                         if (rx->sta)
2967                                 rx->sta->rx_stats.packets++;
2968
2969                         return RX_QUEUED;
2970                 }
2971         }
2972
2973         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2974             unlikely(port_control) && sdata->bss) {
2975                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2976                                      u.ap);
2977                 dev = sdata->dev;
2978                 rx->sdata = sdata;
2979         }
2980
2981         rx->skb->dev = dev;
2982
2983         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2984             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2985             !is_multicast_ether_addr(
2986                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2987             (!local->scanning &&
2988              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2989                 mod_timer(&local->dynamic_ps_timer, jiffies +
2990                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2991
2992         ieee80211_deliver_skb(rx);
2993
2994         return RX_QUEUED;
2995 }
2996
2997 static ieee80211_rx_result debug_noinline
2998 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2999 {
3000         struct sk_buff *skb = rx->skb;
3001         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3002         struct tid_ampdu_rx *tid_agg_rx;
3003         u16 start_seq_num;
3004         u16 tid;
3005
3006         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3007                 return RX_CONTINUE;
3008
3009         if (ieee80211_is_back_req(bar->frame_control)) {
3010                 struct {
3011                         __le16 control, start_seq_num;
3012                 } __packed bar_data;
3013                 struct ieee80211_event event = {
3014                         .type = BAR_RX_EVENT,
3015                 };
3016
3017                 if (!rx->sta)
3018                         return RX_DROP_MONITOR;
3019
3020                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3021                                   &bar_data, sizeof(bar_data)))
3022                         return RX_DROP_MONITOR;
3023
3024                 tid = le16_to_cpu(bar_data.control) >> 12;
3025
3026                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3027                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3028                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3029                                              WLAN_BACK_RECIPIENT,
3030                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3031
3032                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3033                 if (!tid_agg_rx)
3034                         return RX_DROP_MONITOR;
3035
3036                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3037                 event.u.ba.tid = tid;
3038                 event.u.ba.ssn = start_seq_num;
3039                 event.u.ba.sta = &rx->sta->sta;
3040
3041                 /* reset session timer */
3042                 if (tid_agg_rx->timeout)
3043                         mod_timer(&tid_agg_rx->session_timer,
3044                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3045
3046                 spin_lock(&tid_agg_rx->reorder_lock);
3047                 /* release stored frames up to start of BAR */
3048                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3049                                                  start_seq_num, frames);
3050                 spin_unlock(&tid_agg_rx->reorder_lock);
3051
3052                 drv_event_callback(rx->local, rx->sdata, &event);
3053
3054                 kfree_skb(skb);
3055                 return RX_QUEUED;
3056         }
3057
3058         /*
3059          * After this point, we only want management frames,
3060          * so we can drop all remaining control frames to
3061          * cooked monitor interfaces.
3062          */
3063         return RX_DROP_MONITOR;
3064 }
3065
3066 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3067                                            struct ieee80211_mgmt *mgmt,
3068                                            size_t len)
3069 {
3070         struct ieee80211_local *local = sdata->local;
3071         struct sk_buff *skb;
3072         struct ieee80211_mgmt *resp;
3073
3074         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3075                 /* Not to own unicast address */
3076                 return;
3077         }
3078
3079         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3080             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3081                 /* Not from the current AP or not associated yet. */
3082                 return;
3083         }
3084
3085         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3086                 /* Too short SA Query request frame */
3087                 return;
3088         }
3089
3090         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3091         if (skb == NULL)
3092                 return;
3093
3094         skb_reserve(skb, local->hw.extra_tx_headroom);
3095         resp = skb_put_zero(skb, 24);
3096         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3097         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3098         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3099         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3100                                           IEEE80211_STYPE_ACTION);
3101         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3102         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3103         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3104         memcpy(resp->u.action.u.sa_query.trans_id,
3105                mgmt->u.action.u.sa_query.trans_id,
3106                WLAN_SA_QUERY_TR_ID_LEN);
3107
3108         ieee80211_tx_skb(sdata, skb);
3109 }
3110
3111 static ieee80211_rx_result debug_noinline
3112 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3113 {
3114         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3115         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3116
3117         /*
3118          * From here on, look only at management frames.
3119          * Data and control frames are already handled,
3120          * and unknown (reserved) frames are useless.
3121          */
3122         if (rx->skb->len < 24)
3123                 return RX_DROP_MONITOR;
3124
3125         if (!ieee80211_is_mgmt(mgmt->frame_control))
3126                 return RX_DROP_MONITOR;
3127
3128         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3129             ieee80211_is_beacon(mgmt->frame_control) &&
3130             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3131                 int sig = 0;
3132
3133                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3134                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3135                         sig = status->signal;
3136
3137                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3138                                             rx->skb->data, rx->skb->len,
3139                                             status->freq, sig);
3140                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3141         }
3142
3143         if (ieee80211_drop_unencrypted_mgmt(rx))
3144                 return RX_DROP_UNUSABLE;
3145
3146         return RX_CONTINUE;
3147 }
3148
3149 static ieee80211_rx_result debug_noinline
3150 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3151 {
3152         struct ieee80211_local *local = rx->local;
3153         struct ieee80211_sub_if_data *sdata = rx->sdata;
3154         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3155         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3156         int len = rx->skb->len;
3157
3158         if (!ieee80211_is_action(mgmt->frame_control))
3159                 return RX_CONTINUE;
3160
3161         /* drop too small frames */
3162         if (len < IEEE80211_MIN_ACTION_SIZE)
3163                 return RX_DROP_UNUSABLE;
3164
3165         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3166             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3167             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3168                 return RX_DROP_UNUSABLE;
3169
3170         switch (mgmt->u.action.category) {
3171         case WLAN_CATEGORY_HT:
3172                 /* reject HT action frames from stations not supporting HT */
3173                 if (!rx->sta->sta.ht_cap.ht_supported)
3174                         goto invalid;
3175
3176                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3177                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3178                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3179                     sdata->vif.type != NL80211_IFTYPE_AP &&
3180                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3181                         break;
3182
3183                 /* verify action & smps_control/chanwidth are present */
3184                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3185                         goto invalid;
3186
3187                 switch (mgmt->u.action.u.ht_smps.action) {
3188                 case WLAN_HT_ACTION_SMPS: {
3189                         struct ieee80211_supported_band *sband;
3190                         enum ieee80211_smps_mode smps_mode;
3191                         struct sta_opmode_info sta_opmode = {};
3192
3193                         /* convert to HT capability */
3194                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3195                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3196                                 smps_mode = IEEE80211_SMPS_OFF;
3197                                 break;
3198                         case WLAN_HT_SMPS_CONTROL_STATIC:
3199                                 smps_mode = IEEE80211_SMPS_STATIC;
3200                                 break;
3201                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3202                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3203                                 break;
3204                         default:
3205                                 goto invalid;
3206                         }
3207
3208                         /* if no change do nothing */
3209                         if (rx->sta->sta.smps_mode == smps_mode)
3210                                 goto handled;
3211                         rx->sta->sta.smps_mode = smps_mode;
3212                         sta_opmode.smps_mode =
3213                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3214                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3215
3216                         sband = rx->local->hw.wiphy->bands[status->band];
3217
3218                         rate_control_rate_update(local, sband, rx->sta,
3219                                                  IEEE80211_RC_SMPS_CHANGED);
3220                         cfg80211_sta_opmode_change_notify(sdata->dev,
3221                                                           rx->sta->addr,
3222                                                           &sta_opmode,
3223                                                           GFP_ATOMIC);
3224                         goto handled;
3225                 }
3226                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3227                         struct ieee80211_supported_band *sband;
3228                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3229                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3230                         struct sta_opmode_info sta_opmode = {};
3231
3232                         /* If it doesn't support 40 MHz it can't change ... */
3233                         if (!(rx->sta->sta.ht_cap.cap &
3234                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3235                                 goto handled;
3236
3237                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3238                                 max_bw = IEEE80211_STA_RX_BW_20;
3239                         else
3240                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3241
3242                         /* set cur_max_bandwidth and recalc sta bw */
3243                         rx->sta->cur_max_bandwidth = max_bw;
3244                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3245
3246                         if (rx->sta->sta.bandwidth == new_bw)
3247                                 goto handled;
3248
3249                         rx->sta->sta.bandwidth = new_bw;
3250                         sband = rx->local->hw.wiphy->bands[status->band];
3251                         sta_opmode.bw =
3252                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3253                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3254
3255                         rate_control_rate_update(local, sband, rx->sta,
3256                                                  IEEE80211_RC_BW_CHANGED);
3257                         cfg80211_sta_opmode_change_notify(sdata->dev,
3258                                                           rx->sta->addr,
3259                                                           &sta_opmode,
3260                                                           GFP_ATOMIC);
3261                         goto handled;
3262                 }
3263                 default:
3264                         goto invalid;
3265                 }
3266
3267                 break;
3268         case WLAN_CATEGORY_PUBLIC:
3269                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3270                         goto invalid;
3271                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3272                         break;
3273                 if (!rx->sta)
3274                         break;
3275                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3276                         break;
3277                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3278                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3279                         break;
3280                 if (len < offsetof(struct ieee80211_mgmt,
3281                                    u.action.u.ext_chan_switch.variable))
3282                         goto invalid;
3283                 goto queue;
3284         case WLAN_CATEGORY_VHT:
3285                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3286                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3287                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3288                     sdata->vif.type != NL80211_IFTYPE_AP &&
3289                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3290                         break;
3291
3292                 /* verify action code is present */
3293                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3294                         goto invalid;
3295
3296                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3297                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3298                         /* verify opmode is present */
3299                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3300                                 goto invalid;
3301                         goto queue;
3302                 }
3303                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3304                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3305                                 goto invalid;
3306                         goto queue;
3307                 }
3308                 default:
3309                         break;
3310                 }
3311                 break;
3312         case WLAN_CATEGORY_BACK:
3313                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3314                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3315                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3316                     sdata->vif.type != NL80211_IFTYPE_AP &&
3317                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3318                         break;
3319
3320                 /* verify action_code is present */
3321                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3322                         break;
3323
3324                 switch (mgmt->u.action.u.addba_req.action_code) {
3325                 case WLAN_ACTION_ADDBA_REQ:
3326                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3327                                    sizeof(mgmt->u.action.u.addba_req)))
3328                                 goto invalid;
3329                         break;
3330                 case WLAN_ACTION_ADDBA_RESP:
3331                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3332                                    sizeof(mgmt->u.action.u.addba_resp)))
3333                                 goto invalid;
3334                         break;
3335                 case WLAN_ACTION_DELBA:
3336                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3337                                    sizeof(mgmt->u.action.u.delba)))
3338                                 goto invalid;
3339                         break;
3340                 default:
3341                         goto invalid;
3342                 }
3343
3344                 goto queue;
3345         case WLAN_CATEGORY_SPECTRUM_MGMT:
3346                 /* verify action_code is present */
3347                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3348                         break;
3349
3350                 switch (mgmt->u.action.u.measurement.action_code) {
3351                 case WLAN_ACTION_SPCT_MSR_REQ:
3352                         if (status->band != NL80211_BAND_5GHZ)
3353                                 break;
3354
3355                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3356                                    sizeof(mgmt->u.action.u.measurement)))
3357                                 break;
3358
3359                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3360                                 break;
3361
3362                         ieee80211_process_measurement_req(sdata, mgmt, len);
3363                         goto handled;
3364                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3365                         u8 *bssid;
3366                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3367                                    sizeof(mgmt->u.action.u.chan_switch)))
3368                                 break;
3369
3370                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3371                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3372                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3373                                 break;
3374
3375                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3376                                 bssid = sdata->u.mgd.bssid;
3377                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3378                                 bssid = sdata->u.ibss.bssid;
3379                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3380                                 bssid = mgmt->sa;
3381                         else
3382                                 break;
3383
3384                         if (!ether_addr_equal(mgmt->bssid, bssid))
3385                                 break;
3386
3387                         goto queue;
3388                         }
3389                 }
3390                 break;
3391         case WLAN_CATEGORY_SA_QUERY:
3392                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3393                            sizeof(mgmt->u.action.u.sa_query)))
3394                         break;
3395
3396                 switch (mgmt->u.action.u.sa_query.action) {
3397                 case WLAN_ACTION_SA_QUERY_REQUEST:
3398                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3399                                 break;
3400                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3401                         goto handled;
3402                 }
3403                 break;
3404         case WLAN_CATEGORY_SELF_PROTECTED:
3405                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3406                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3407                         break;
3408
3409                 switch (mgmt->u.action.u.self_prot.action_code) {
3410                 case WLAN_SP_MESH_PEERING_OPEN:
3411                 case WLAN_SP_MESH_PEERING_CLOSE:
3412                 case WLAN_SP_MESH_PEERING_CONFIRM:
3413                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3414                                 goto invalid;
3415                         if (sdata->u.mesh.user_mpm)
3416                                 /* userspace handles this frame */
3417                                 break;
3418                         goto queue;
3419                 case WLAN_SP_MGK_INFORM:
3420                 case WLAN_SP_MGK_ACK:
3421                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3422                                 goto invalid;
3423                         break;
3424                 }
3425                 break;
3426         case WLAN_CATEGORY_MESH_ACTION:
3427                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3428                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3429                         break;
3430
3431                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3432                         break;
3433                 if (mesh_action_is_path_sel(mgmt) &&
3434                     !mesh_path_sel_is_hwmp(sdata))
3435                         break;
3436                 goto queue;
3437         }
3438
3439         return RX_CONTINUE;
3440
3441  invalid:
3442         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3443         /* will return in the next handlers */
3444         return RX_CONTINUE;
3445
3446  handled:
3447         if (rx->sta)
3448                 rx->sta->rx_stats.packets++;
3449         dev_kfree_skb(rx->skb);
3450         return RX_QUEUED;
3451
3452  queue:
3453         skb_queue_tail(&sdata->skb_queue, rx->skb);
3454         ieee80211_queue_work(&local->hw, &sdata->work);
3455         if (rx->sta)
3456                 rx->sta->rx_stats.packets++;
3457         return RX_QUEUED;
3458 }
3459
3460 static ieee80211_rx_result debug_noinline
3461 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3462 {
3463         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3464         int sig = 0;
3465
3466         /* skip known-bad action frames and return them in the next handler */
3467         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3468                 return RX_CONTINUE;
3469
3470         /*
3471          * Getting here means the kernel doesn't know how to handle
3472          * it, but maybe userspace does ... include returned frames
3473          * so userspace can register for those to know whether ones
3474          * it transmitted were processed or returned.
3475          */
3476
3477         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3478             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3479                 sig = status->signal;
3480
3481         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3482                              rx->skb->data, rx->skb->len, 0)) {
3483                 if (rx->sta)
3484                         rx->sta->rx_stats.packets++;
3485                 dev_kfree_skb(rx->skb);
3486                 return RX_QUEUED;
3487         }
3488
3489         return RX_CONTINUE;
3490 }
3491
3492 static ieee80211_rx_result debug_noinline
3493 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3494 {
3495         struct ieee80211_local *local = rx->local;
3496         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3497         struct sk_buff *nskb;
3498         struct ieee80211_sub_if_data *sdata = rx->sdata;
3499         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3500
3501         if (!ieee80211_is_action(mgmt->frame_control))
3502                 return RX_CONTINUE;
3503
3504         /*
3505          * For AP mode, hostapd is responsible for handling any action
3506          * frames that we didn't handle, including returning unknown
3507          * ones. For all other modes we will return them to the sender,
3508          * setting the 0x80 bit in the action category, as required by
3509          * 802.11-2012 9.24.4.
3510          * Newer versions of hostapd shall also use the management frame
3511          * registration mechanisms, but older ones still use cooked
3512          * monitor interfaces so push all frames there.
3513          */
3514         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3515             (sdata->vif.type == NL80211_IFTYPE_AP ||
3516              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3517                 return RX_DROP_MONITOR;
3518
3519         if (is_multicast_ether_addr(mgmt->da))
3520                 return RX_DROP_MONITOR;
3521
3522         /* do not return rejected action frames */
3523         if (mgmt->u.action.category & 0x80)
3524                 return RX_DROP_UNUSABLE;
3525
3526         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3527                                GFP_ATOMIC);
3528         if (nskb) {
3529                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3530
3531                 nmgmt->u.action.category |= 0x80;
3532                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3533                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3534
3535                 memset(nskb->cb, 0, sizeof(nskb->cb));
3536
3537                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3538                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3539
3540                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3541                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3542                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3543                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3544                                 info->hw_queue =
3545                                         local->hw.offchannel_tx_hw_queue;
3546                 }
3547
3548                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3549                                             status->band, 0);
3550         }
3551         dev_kfree_skb(rx->skb);
3552         return RX_QUEUED;
3553 }
3554
3555 static ieee80211_rx_result debug_noinline
3556 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3557 {
3558         struct ieee80211_sub_if_data *sdata = rx->sdata;
3559         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3560         __le16 stype;
3561
3562         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3563
3564         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3565             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3566             sdata->vif.type != NL80211_IFTYPE_OCB &&
3567             sdata->vif.type != NL80211_IFTYPE_STATION)
3568                 return RX_DROP_MONITOR;
3569
3570         switch (stype) {
3571         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3572         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3573         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3574                 /* process for all: mesh, mlme, ibss */
3575                 break;
3576         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3577                 if (is_multicast_ether_addr(mgmt->da) &&
3578                     !is_broadcast_ether_addr(mgmt->da))
3579                         return RX_DROP_MONITOR;
3580
3581                 /* process only for station/IBSS */
3582                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3583                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3584                         return RX_DROP_MONITOR;
3585                 break;
3586         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3587         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3588         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3589                 if (is_multicast_ether_addr(mgmt->da) &&
3590                     !is_broadcast_ether_addr(mgmt->da))
3591                         return RX_DROP_MONITOR;
3592
3593                 /* process only for station */
3594                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3595                         return RX_DROP_MONITOR;
3596                 break;
3597         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3598                 /* process only for ibss and mesh */
3599                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3600                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3601                         return RX_DROP_MONITOR;
3602                 break;
3603         default:
3604                 return RX_DROP_MONITOR;
3605         }
3606
3607         /* queue up frame and kick off work to process it */
3608         skb_queue_tail(&sdata->skb_queue, rx->skb);
3609         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3610         if (rx->sta)
3611                 rx->sta->rx_stats.packets++;
3612
3613         return RX_QUEUED;
3614 }
3615
3616 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3617                                         struct ieee80211_rate *rate)
3618 {
3619         struct ieee80211_sub_if_data *sdata;
3620         struct ieee80211_local *local = rx->local;
3621         struct sk_buff *skb = rx->skb, *skb2;
3622         struct net_device *prev_dev = NULL;
3623         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3624         int needed_headroom;
3625
3626         /*
3627          * If cooked monitor has been processed already, then
3628          * don't do it again. If not, set the flag.
3629          */
3630         if (rx->flags & IEEE80211_RX_CMNTR)
3631                 goto out_free_skb;
3632         rx->flags |= IEEE80211_RX_CMNTR;
3633
3634         /* If there are no cooked monitor interfaces, just free the SKB */
3635         if (!local->cooked_mntrs)
3636                 goto out_free_skb;
3637
3638         /* vendor data is long removed here */
3639         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3640         /* room for the radiotap header based on driver features */
3641         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3642
3643         if (skb_headroom(skb) < needed_headroom &&
3644             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3645                 goto out_free_skb;
3646
3647         /* prepend radiotap information */
3648         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3649                                          false);
3650
3651         skb_reset_mac_header(skb);
3652         skb->ip_summed = CHECKSUM_UNNECESSARY;
3653         skb->pkt_type = PACKET_OTHERHOST;
3654         skb->protocol = htons(ETH_P_802_2);
3655
3656         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3657                 if (!ieee80211_sdata_running(sdata))
3658                         continue;
3659
3660                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3661                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3662                         continue;
3663
3664                 if (prev_dev) {
3665                         skb2 = skb_clone(skb, GFP_ATOMIC);
3666                         if (skb2) {
3667                                 skb2->dev = prev_dev;
3668                                 netif_receive_skb(skb2);
3669                         }
3670                 }
3671
3672                 prev_dev = sdata->dev;
3673                 ieee80211_rx_stats(sdata->dev, skb->len);
3674         }
3675
3676         if (prev_dev) {
3677                 skb->dev = prev_dev;
3678                 netif_receive_skb(skb);
3679                 return;
3680         }
3681
3682  out_free_skb:
3683         dev_kfree_skb(skb);
3684 }
3685
3686 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3687                                          ieee80211_rx_result res)
3688 {
3689         switch (res) {
3690         case RX_DROP_MONITOR:
3691                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3692                 if (rx->sta)
3693                         rx->sta->rx_stats.dropped++;
3694                 /* fall through */
3695         case RX_CONTINUE: {
3696                 struct ieee80211_rate *rate = NULL;
3697                 struct ieee80211_supported_band *sband;
3698                 struct ieee80211_rx_status *status;
3699
3700                 status = IEEE80211_SKB_RXCB((rx->skb));
3701
3702                 sband = rx->local->hw.wiphy->bands[status->band];
3703                 if (status->encoding == RX_ENC_LEGACY)
3704                         rate = &sband->bitrates[status->rate_idx];
3705
3706                 ieee80211_rx_cooked_monitor(rx, rate);
3707                 break;
3708                 }
3709         case RX_DROP_UNUSABLE:
3710                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3711                 if (rx->sta)
3712                         rx->sta->rx_stats.dropped++;
3713                 dev_kfree_skb(rx->skb);
3714                 break;
3715         case RX_QUEUED:
3716                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3717                 break;
3718         }
3719 }
3720
3721 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3722                                   struct sk_buff_head *frames)
3723 {
3724         ieee80211_rx_result res = RX_DROP_MONITOR;
3725         struct sk_buff *skb;
3726
3727 #define CALL_RXH(rxh)                   \
3728         do {                            \
3729                 res = rxh(rx);          \
3730                 if (res != RX_CONTINUE) \
3731                         goto rxh_next;  \
3732         } while (0)
3733
3734         /* Lock here to avoid hitting all of the data used in the RX
3735          * path (e.g. key data, station data, ...) concurrently when
3736          * a frame is released from the reorder buffer due to timeout
3737          * from the timer, potentially concurrently with RX from the
3738          * driver.
3739          */
3740         spin_lock_bh(&rx->local->rx_path_lock);
3741
3742         while ((skb = __skb_dequeue(frames))) {
3743                 /*
3744                  * all the other fields are valid across frames
3745                  * that belong to an aMPDU since they are on the
3746                  * same TID from the same station
3747                  */
3748                 rx->skb = skb;
3749
3750                 CALL_RXH(ieee80211_rx_h_check_more_data);
3751                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3752                 CALL_RXH(ieee80211_rx_h_sta_process);
3753                 CALL_RXH(ieee80211_rx_h_decrypt);
3754                 CALL_RXH(ieee80211_rx_h_defragment);
3755                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3756                 /* must be after MMIC verify so header is counted in MPDU mic */
3757 #ifdef CONFIG_MAC80211_MESH
3758                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3759                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3760 #endif
3761                 CALL_RXH(ieee80211_rx_h_amsdu);
3762                 CALL_RXH(ieee80211_rx_h_data);
3763
3764                 /* special treatment -- needs the queue */
3765                 res = ieee80211_rx_h_ctrl(rx, frames);
3766                 if (res != RX_CONTINUE)
3767                         goto rxh_next;
3768
3769                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3770                 CALL_RXH(ieee80211_rx_h_action);
3771                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3772                 CALL_RXH(ieee80211_rx_h_action_return);
3773                 CALL_RXH(ieee80211_rx_h_mgmt);
3774
3775  rxh_next:
3776                 ieee80211_rx_handlers_result(rx, res);
3777
3778 #undef CALL_RXH
3779         }
3780
3781         spin_unlock_bh(&rx->local->rx_path_lock);
3782 }
3783
3784 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3785 {
3786         struct sk_buff_head reorder_release;
3787         ieee80211_rx_result res = RX_DROP_MONITOR;
3788
3789         __skb_queue_head_init(&reorder_release);
3790
3791 #define CALL_RXH(rxh)                   \
3792         do {                            \
3793                 res = rxh(rx);          \
3794                 if (res != RX_CONTINUE) \
3795                         goto rxh_next;  \
3796         } while (0)
3797
3798         CALL_RXH(ieee80211_rx_h_check_dup);
3799         CALL_RXH(ieee80211_rx_h_check);
3800
3801         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3802
3803         ieee80211_rx_handlers(rx, &reorder_release);
3804         return;
3805
3806  rxh_next:
3807         ieee80211_rx_handlers_result(rx, res);
3808
3809 #undef CALL_RXH
3810 }
3811
3812 /*
3813  * This function makes calls into the RX path, therefore
3814  * it has to be invoked under RCU read lock.
3815  */
3816 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3817 {
3818         struct sk_buff_head frames;
3819         struct ieee80211_rx_data rx = {
3820                 .sta = sta,
3821                 .sdata = sta->sdata,
3822                 .local = sta->local,
3823                 /* This is OK -- must be QoS data frame */
3824                 .security_idx = tid,
3825                 .seqno_idx = tid,
3826                 .napi = NULL, /* must be NULL to not have races */
3827         };
3828         struct tid_ampdu_rx *tid_agg_rx;
3829
3830         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3831         if (!tid_agg_rx)
3832                 return;
3833
3834         __skb_queue_head_init(&frames);
3835
3836         spin_lock(&tid_agg_rx->reorder_lock);
3837         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3838         spin_unlock(&tid_agg_rx->reorder_lock);
3839
3840         if (!skb_queue_empty(&frames)) {
3841                 struct ieee80211_event event = {
3842                         .type = BA_FRAME_TIMEOUT,
3843                         .u.ba.tid = tid,
3844                         .u.ba.sta = &sta->sta,
3845                 };
3846                 drv_event_callback(rx.local, rx.sdata, &event);
3847         }
3848
3849         ieee80211_rx_handlers(&rx, &frames);
3850 }
3851
3852 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3853                                           u16 ssn, u64 filtered,
3854                                           u16 received_mpdus)
3855 {
3856         struct sta_info *sta;
3857         struct tid_ampdu_rx *tid_agg_rx;
3858         struct sk_buff_head frames;
3859         struct ieee80211_rx_data rx = {
3860                 /* This is OK -- must be QoS data frame */
3861                 .security_idx = tid,
3862                 .seqno_idx = tid,
3863         };
3864         int i, diff;
3865
3866         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3867                 return;
3868
3869         __skb_queue_head_init(&frames);
3870
3871         sta = container_of(pubsta, struct sta_info, sta);
3872
3873         rx.sta = sta;
3874         rx.sdata = sta->sdata;
3875         rx.local = sta->local;
3876
3877         rcu_read_lock();
3878         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3879         if (!tid_agg_rx)
3880                 goto out;
3881
3882         spin_lock_bh(&tid_agg_rx->reorder_lock);
3883
3884         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3885                 int release;
3886
3887                 /* release all frames in the reorder buffer */
3888                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3889                            IEEE80211_SN_MODULO;
3890                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3891                                                  release, &frames);
3892                 /* update ssn to match received ssn */
3893                 tid_agg_rx->head_seq_num = ssn;
3894         } else {
3895                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3896                                                  &frames);
3897         }
3898
3899         /* handle the case that received ssn is behind the mac ssn.
3900          * it can be tid_agg_rx->buf_size behind and still be valid */
3901         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3902         if (diff >= tid_agg_rx->buf_size) {
3903                 tid_agg_rx->reorder_buf_filtered = 0;
3904                 goto release;
3905         }
3906         filtered = filtered >> diff;
3907         ssn += diff;
3908
3909         /* update bitmap */
3910         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3911                 int index = (ssn + i) % tid_agg_rx->buf_size;
3912
3913                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3914                 if (filtered & BIT_ULL(i))
3915                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3916         }
3917
3918         /* now process also frames that the filter marking released */
3919         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3920
3921 release:
3922         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3923
3924         ieee80211_rx_handlers(&rx, &frames);
3925
3926  out:
3927         rcu_read_unlock();
3928 }
3929 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3930
3931 /* main receive path */
3932
3933 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3934 {
3935         struct ieee80211_sub_if_data *sdata = rx->sdata;
3936         struct sk_buff *skb = rx->skb;
3937         struct ieee80211_hdr *hdr = (void *)skb->data;
3938         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3939         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3940         bool multicast = is_multicast_ether_addr(hdr->addr1);
3941
3942         switch (sdata->vif.type) {
3943         case NL80211_IFTYPE_STATION:
3944                 if (!bssid && !sdata->u.mgd.use_4addr)
3945                         return false;
3946                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3947                         return false;
3948                 if (multicast)
3949                         return true;
3950                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3951         case NL80211_IFTYPE_ADHOC:
3952                 if (!bssid)
3953                         return false;
3954                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3955                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
3956                     !is_valid_ether_addr(hdr->addr2))
3957                         return false;
3958                 if (ieee80211_is_beacon(hdr->frame_control))
3959                         return true;
3960                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3961                         return false;
3962                 if (!multicast &&
3963                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3964                         return false;
3965                 if (!rx->sta) {
3966                         int rate_idx;
3967                         if (status->encoding != RX_ENC_LEGACY)
3968                                 rate_idx = 0; /* TODO: HT/VHT rates */
3969                         else
3970                                 rate_idx = status->rate_idx;
3971                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3972                                                  BIT(rate_idx));
3973                 }
3974                 return true;
3975         case NL80211_IFTYPE_OCB:
3976                 if (!bssid)
3977                         return false;
3978                 if (!ieee80211_is_data_present(hdr->frame_control))
3979                         return false;
3980                 if (!is_broadcast_ether_addr(bssid))
3981                         return false;
3982                 if (!multicast &&
3983                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3984                         return false;
3985                 if (!rx->sta) {
3986                         int rate_idx;
3987                         if (status->encoding != RX_ENC_LEGACY)
3988                                 rate_idx = 0; /* TODO: HT rates */
3989                         else
3990                                 rate_idx = status->rate_idx;
3991                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3992                                                 BIT(rate_idx));
3993                 }
3994                 return true;
3995         case NL80211_IFTYPE_MESH_POINT:
3996                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3997                         return false;
3998                 if (multicast)
3999                         return true;
4000                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4001         case NL80211_IFTYPE_AP_VLAN:
4002         case NL80211_IFTYPE_AP:
4003                 if (!bssid)
4004                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4005
4006                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4007                         /*
4008                          * Accept public action frames even when the
4009                          * BSSID doesn't match, this is used for P2P
4010                          * and location updates. Note that mac80211
4011                          * itself never looks at these frames.
4012                          */
4013                         if (!multicast &&
4014                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4015                                 return false;
4016                         if (ieee80211_is_public_action(hdr, skb->len))
4017                                 return true;
4018                         return ieee80211_is_beacon(hdr->frame_control);
4019                 }
4020
4021                 if (!ieee80211_has_tods(hdr->frame_control)) {
4022                         /* ignore data frames to TDLS-peers */
4023                         if (ieee80211_is_data(hdr->frame_control))
4024                                 return false;
4025                         /* ignore action frames to TDLS-peers */
4026                         if (ieee80211_is_action(hdr->frame_control) &&
4027                             !is_broadcast_ether_addr(bssid) &&
4028                             !ether_addr_equal(bssid, hdr->addr1))
4029                                 return false;
4030                 }
4031
4032                 /*
4033                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4034                  * the BSSID - we've checked that already but may have accepted
4035                  * the wildcard (ff:ff:ff:ff:ff:ff).
4036                  *
4037                  * It also says:
4038                  *      The BSSID of the Data frame is determined as follows:
4039                  *      a) If the STA is contained within an AP or is associated
4040                  *         with an AP, the BSSID is the address currently in use
4041                  *         by the STA contained in the AP.
4042                  *
4043                  * So we should not accept data frames with an address that's
4044                  * multicast.
4045                  *
4046                  * Accepting it also opens a security problem because stations
4047                  * could encrypt it with the GTK and inject traffic that way.
4048                  */
4049                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4050                         return false;
4051
4052                 return true;
4053         case NL80211_IFTYPE_WDS:
4054                 if (bssid || !ieee80211_is_data(hdr->frame_control))
4055                         return false;
4056                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
4057         case NL80211_IFTYPE_P2P_DEVICE:
4058                 return ieee80211_is_public_action(hdr, skb->len) ||
4059                        ieee80211_is_probe_req(hdr->frame_control) ||
4060                        ieee80211_is_probe_resp(hdr->frame_control) ||
4061                        ieee80211_is_beacon(hdr->frame_control);
4062         case NL80211_IFTYPE_NAN:
4063                 /* Currently no frames on NAN interface are allowed */
4064                 return false;
4065         default:
4066                 break;
4067         }
4068
4069         WARN_ON_ONCE(1);
4070         return false;
4071 }
4072
4073 void ieee80211_check_fast_rx(struct sta_info *sta)
4074 {
4075         struct ieee80211_sub_if_data *sdata = sta->sdata;
4076         struct ieee80211_local *local = sdata->local;
4077         struct ieee80211_key *key;
4078         struct ieee80211_fast_rx fastrx = {
4079                 .dev = sdata->dev,
4080                 .vif_type = sdata->vif.type,
4081                 .control_port_protocol = sdata->control_port_protocol,
4082         }, *old, *new = NULL;
4083         bool assign = false;
4084
4085         /* use sparse to check that we don't return without updating */
4086         __acquire(check_fast_rx);
4087
4088         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4089         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4090         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4091         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4092
4093         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4094
4095         /* fast-rx doesn't do reordering */
4096         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4097             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4098                 goto clear;
4099
4100         switch (sdata->vif.type) {
4101         case NL80211_IFTYPE_STATION:
4102                 if (sta->sta.tdls) {
4103                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4104                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4105                         fastrx.expected_ds_bits = 0;
4106                 } else {
4107                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
4108                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4109                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4110                         fastrx.expected_ds_bits =
4111                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4112                 }
4113
4114                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4115                         fastrx.expected_ds_bits |=
4116                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4117                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4118                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4119                 }
4120
4121                 if (!sdata->u.mgd.powersave)
4122                         break;
4123
4124                 /* software powersave is a huge mess, avoid all of it */
4125                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4126                         goto clear;
4127                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4128                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4129                         goto clear;
4130                 break;
4131         case NL80211_IFTYPE_AP_VLAN:
4132         case NL80211_IFTYPE_AP:
4133                 /* parallel-rx requires this, at least with calls to
4134                  * ieee80211_sta_ps_transition()
4135                  */
4136                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4137                         goto clear;
4138                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4139                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4140                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4141
4142                 fastrx.internal_forward =
4143                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4144                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4145                          !sdata->u.vlan.sta);
4146
4147                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4148                     sdata->u.vlan.sta) {
4149                         fastrx.expected_ds_bits |=
4150                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4151                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4152                         fastrx.internal_forward = 0;
4153                 }
4154
4155                 break;
4156         default:
4157                 goto clear;
4158         }
4159
4160         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4161                 goto clear;
4162
4163         rcu_read_lock();
4164         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4165         if (!key)
4166                 key = rcu_dereference(sdata->default_unicast_key);
4167         if (key) {
4168                 switch (key->conf.cipher) {
4169                 case WLAN_CIPHER_SUITE_TKIP:
4170                         /* we don't want to deal with MMIC in fast-rx */
4171                         goto clear_rcu;
4172                 case WLAN_CIPHER_SUITE_CCMP:
4173                 case WLAN_CIPHER_SUITE_CCMP_256:
4174                 case WLAN_CIPHER_SUITE_GCMP:
4175                 case WLAN_CIPHER_SUITE_GCMP_256:
4176                         break;
4177                 default:
4178                         /* We also don't want to deal with
4179                          * WEP or cipher scheme.
4180                          */
4181                         goto clear_rcu;
4182                 }
4183
4184                 fastrx.key = true;
4185                 fastrx.icv_len = key->conf.icv_len;
4186         }
4187
4188         assign = true;
4189  clear_rcu:
4190         rcu_read_unlock();
4191  clear:
4192         __release(check_fast_rx);
4193
4194         if (assign)
4195                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4196
4197         spin_lock_bh(&sta->lock);
4198         old = rcu_dereference_protected(sta->fast_rx, true);
4199         rcu_assign_pointer(sta->fast_rx, new);
4200         spin_unlock_bh(&sta->lock);
4201
4202         if (old)
4203                 kfree_rcu(old, rcu_head);
4204 }
4205
4206 void ieee80211_clear_fast_rx(struct sta_info *sta)
4207 {
4208         struct ieee80211_fast_rx *old;
4209
4210         spin_lock_bh(&sta->lock);
4211         old = rcu_dereference_protected(sta->fast_rx, true);
4212         RCU_INIT_POINTER(sta->fast_rx, NULL);
4213         spin_unlock_bh(&sta->lock);
4214
4215         if (old)
4216                 kfree_rcu(old, rcu_head);
4217 }
4218
4219 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4220 {
4221         struct ieee80211_local *local = sdata->local;
4222         struct sta_info *sta;
4223
4224         lockdep_assert_held(&local->sta_mtx);
4225
4226         list_for_each_entry(sta, &local->sta_list, list) {
4227                 if (sdata != sta->sdata &&
4228                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4229                         continue;
4230                 ieee80211_check_fast_rx(sta);
4231         }
4232 }
4233
4234 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4235 {
4236         struct ieee80211_local *local = sdata->local;
4237
4238         mutex_lock(&local->sta_mtx);
4239         __ieee80211_check_fast_rx_iface(sdata);
4240         mutex_unlock(&local->sta_mtx);
4241 }
4242
4243 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4244                                      struct ieee80211_fast_rx *fast_rx)
4245 {
4246         struct sk_buff *skb = rx->skb;
4247         struct ieee80211_hdr *hdr = (void *)skb->data;
4248         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4249         struct sta_info *sta = rx->sta;
4250         int orig_len = skb->len;
4251         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4252         int snap_offs = hdrlen;
4253         struct {
4254                 u8 snap[sizeof(rfc1042_header)];
4255                 __be16 proto;
4256         } *payload __aligned(2);
4257         struct {
4258                 u8 da[ETH_ALEN];
4259                 u8 sa[ETH_ALEN];
4260         } addrs __aligned(2);
4261         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4262
4263         if (fast_rx->uses_rss)
4264                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4265
4266         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4267          * to a common data structure; drivers can implement that per queue
4268          * but we don't have that information in mac80211
4269          */
4270         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4271                 return false;
4272
4273 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4274
4275         /* If using encryption, we also need to have:
4276          *  - PN_VALIDATED: similar, but the implementation is tricky
4277          *  - DECRYPTED: necessary for PN_VALIDATED
4278          */
4279         if (fast_rx->key &&
4280             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4281                 return false;
4282
4283         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4284                 return false;
4285
4286         if (unlikely(ieee80211_is_frag(hdr)))
4287                 return false;
4288
4289         /* Since our interface address cannot be multicast, this
4290          * implicitly also rejects multicast frames without the
4291          * explicit check.
4292          *
4293          * We shouldn't get any *data* frames not addressed to us
4294          * (AP mode will accept multicast *management* frames), but
4295          * punting here will make it go through the full checks in
4296          * ieee80211_accept_frame().
4297          */
4298         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4299                 return false;
4300
4301         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4302                                               IEEE80211_FCTL_TODS)) !=
4303             fast_rx->expected_ds_bits)
4304                 return false;
4305
4306         /* assign the key to drop unencrypted frames (later)
4307          * and strip the IV/MIC if necessary
4308          */
4309         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4310                 /* GCMP header length is the same */
4311                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4312         }
4313
4314         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4315                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4316                         goto drop;
4317
4318                 payload = (void *)(skb->data + snap_offs);
4319
4320                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4321                         return false;
4322
4323                 /* Don't handle these here since they require special code.
4324                  * Accept AARP and IPX even though they should come with a
4325                  * bridge-tunnel header - but if we get them this way then
4326                  * there's little point in discarding them.
4327                  */
4328                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4329                              payload->proto == fast_rx->control_port_protocol))
4330                         return false;
4331         }
4332
4333         /* after this point, don't punt to the slowpath! */
4334
4335         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4336             pskb_trim(skb, skb->len - fast_rx->icv_len))
4337                 goto drop;
4338
4339         if (unlikely(fast_rx->sta_notify)) {
4340                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4341                 fast_rx->sta_notify = false;
4342         }
4343
4344         /* statistics part of ieee80211_rx_h_sta_process() */
4345         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4346                 stats->last_signal = status->signal;
4347                 if (!fast_rx->uses_rss)
4348                         ewma_signal_add(&sta->rx_stats_avg.signal,
4349                                         -status->signal);
4350         }
4351
4352         if (status->chains) {
4353                 int i;
4354
4355                 stats->chains = status->chains;
4356                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4357                         int signal = status->chain_signal[i];
4358
4359                         if (!(status->chains & BIT(i)))
4360                                 continue;
4361
4362                         stats->chain_signal_last[i] = signal;
4363                         if (!fast_rx->uses_rss)
4364                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4365                                                 -signal);
4366                 }
4367         }
4368         /* end of statistics */
4369
4370         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4371                 goto drop;
4372
4373         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4374                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4375                     RX_QUEUED)
4376                         goto drop;
4377
4378                 return true;
4379         }
4380
4381         stats->last_rx = jiffies;
4382         stats->last_rate = sta_stats_encode_rate(status);
4383
4384         stats->fragments++;
4385         stats->packets++;
4386
4387         /* do the header conversion - first grab the addresses */
4388         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4389         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4390         /* remove the SNAP but leave the ethertype */
4391         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4392         /* push the addresses in front */
4393         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4394
4395         skb->dev = fast_rx->dev;
4396
4397         ieee80211_rx_stats(fast_rx->dev, skb->len);
4398
4399         /* The seqno index has the same property as needed
4400          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4401          * for non-QoS-data frames. Here we know it's a data
4402          * frame, so count MSDUs.
4403          */
4404         u64_stats_update_begin(&stats->syncp);
4405         stats->msdu[rx->seqno_idx]++;
4406         stats->bytes += orig_len;
4407         u64_stats_update_end(&stats->syncp);
4408
4409         if (fast_rx->internal_forward) {
4410                 struct sk_buff *xmit_skb = NULL;
4411                 if (is_multicast_ether_addr(addrs.da)) {
4412                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4413                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4414                            sta_info_get(rx->sdata, addrs.da)) {
4415                         xmit_skb = skb;
4416                         skb = NULL;
4417                 }
4418
4419                 if (xmit_skb) {
4420                         /*
4421                          * Send to wireless media and increase priority by 256
4422                          * to keep the received priority instead of
4423                          * reclassifying the frame (see cfg80211_classify8021d).
4424                          */
4425                         xmit_skb->priority += 256;
4426                         xmit_skb->protocol = htons(ETH_P_802_3);
4427                         skb_reset_network_header(xmit_skb);
4428                         skb_reset_mac_header(xmit_skb);
4429                         dev_queue_xmit(xmit_skb);
4430                 }
4431
4432                 if (!skb)
4433                         return true;
4434         }
4435
4436         /* deliver to local stack */
4437         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4438         memset(skb->cb, 0, sizeof(skb->cb));
4439         if (rx->napi)
4440                 napi_gro_receive(rx->napi, skb);
4441         else
4442                 netif_receive_skb(skb);
4443
4444         return true;
4445  drop:
4446         dev_kfree_skb(skb);
4447         stats->dropped++;
4448         return true;
4449 }
4450
4451 /*
4452  * This function returns whether or not the SKB
4453  * was destined for RX processing or not, which,
4454  * if consume is true, is equivalent to whether
4455  * or not the skb was consumed.
4456  */
4457 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4458                                             struct sk_buff *skb, bool consume)
4459 {
4460         struct ieee80211_local *local = rx->local;
4461         struct ieee80211_sub_if_data *sdata = rx->sdata;
4462
4463         rx->skb = skb;
4464
4465         /* See if we can do fast-rx; if we have to copy we already lost,
4466          * so punt in that case. We should never have to deliver a data
4467          * frame to multiple interfaces anyway.
4468          *
4469          * We skip the ieee80211_accept_frame() call and do the necessary
4470          * checking inside ieee80211_invoke_fast_rx().
4471          */
4472         if (consume && rx->sta) {
4473                 struct ieee80211_fast_rx *fast_rx;
4474
4475                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4476                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4477                         return true;
4478         }
4479
4480         if (!ieee80211_accept_frame(rx))
4481                 return false;
4482
4483         if (!consume) {
4484                 skb = skb_copy(skb, GFP_ATOMIC);
4485                 if (!skb) {
4486                         if (net_ratelimit())
4487                                 wiphy_debug(local->hw.wiphy,
4488                                         "failed to copy skb for %s\n",
4489                                         sdata->name);
4490                         return true;
4491                 }
4492
4493                 rx->skb = skb;
4494         }
4495
4496         ieee80211_invoke_rx_handlers(rx);
4497         return true;
4498 }
4499
4500 /*
4501  * This is the actual Rx frames handler. as it belongs to Rx path it must
4502  * be called with rcu_read_lock protection.
4503  */
4504 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4505                                          struct ieee80211_sta *pubsta,
4506                                          struct sk_buff *skb,
4507                                          struct napi_struct *napi)
4508 {
4509         struct ieee80211_local *local = hw_to_local(hw);
4510         struct ieee80211_sub_if_data *sdata;
4511         struct ieee80211_hdr *hdr;
4512         __le16 fc;
4513         struct ieee80211_rx_data rx;
4514         struct ieee80211_sub_if_data *prev;
4515         struct rhlist_head *tmp;
4516         int err = 0;
4517
4518         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4519         memset(&rx, 0, sizeof(rx));
4520         rx.skb = skb;
4521         rx.local = local;
4522         rx.napi = napi;
4523
4524         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4525                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4526
4527         if (ieee80211_is_mgmt(fc)) {
4528                 /* drop frame if too short for header */
4529                 if (skb->len < ieee80211_hdrlen(fc))
4530                         err = -ENOBUFS;
4531                 else
4532                         err = skb_linearize(skb);
4533         } else {
4534                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4535         }
4536
4537         if (err) {
4538                 dev_kfree_skb(skb);
4539                 return;
4540         }
4541
4542         hdr = (struct ieee80211_hdr *)skb->data;
4543         ieee80211_parse_qos(&rx);
4544         ieee80211_verify_alignment(&rx);
4545
4546         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4547                      ieee80211_is_beacon(hdr->frame_control)))
4548                 ieee80211_scan_rx(local, skb);
4549
4550         if (ieee80211_is_data(fc)) {
4551                 struct sta_info *sta, *prev_sta;
4552
4553                 if (pubsta) {
4554                         rx.sta = container_of(pubsta, struct sta_info, sta);
4555                         rx.sdata = rx.sta->sdata;
4556                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4557                                 return;
4558                         goto out;
4559                 }
4560
4561                 prev_sta = NULL;
4562
4563                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4564                         if (!prev_sta) {
4565                                 prev_sta = sta;
4566                                 continue;
4567                         }
4568
4569                         rx.sta = prev_sta;
4570                         rx.sdata = prev_sta->sdata;
4571                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4572
4573                         prev_sta = sta;
4574                 }
4575
4576                 if (prev_sta) {
4577                         rx.sta = prev_sta;
4578                         rx.sdata = prev_sta->sdata;
4579
4580                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4581                                 return;
4582                         goto out;
4583                 }
4584         }
4585
4586         prev = NULL;
4587
4588         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4589                 if (!ieee80211_sdata_running(sdata))
4590                         continue;
4591
4592                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4593                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4594                         continue;
4595
4596                 /*
4597                  * frame is destined for this interface, but if it's
4598                  * not also for the previous one we handle that after
4599                  * the loop to avoid copying the SKB once too much
4600                  */
4601
4602                 if (!prev) {
4603                         prev = sdata;
4604                         continue;
4605                 }
4606
4607                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4608                 rx.sdata = prev;
4609                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4610
4611                 prev = sdata;
4612         }
4613
4614         if (prev) {
4615                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4616                 rx.sdata = prev;
4617
4618                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4619                         return;
4620         }
4621
4622  out:
4623         dev_kfree_skb(skb);
4624 }
4625
4626 /*
4627  * This is the receive path handler. It is called by a low level driver when an
4628  * 802.11 MPDU is received from the hardware.
4629  */
4630 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4631                        struct sk_buff *skb, struct napi_struct *napi)
4632 {
4633         struct ieee80211_local *local = hw_to_local(hw);
4634         struct ieee80211_rate *rate = NULL;
4635         struct ieee80211_supported_band *sband;
4636         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4637
4638         WARN_ON_ONCE(softirq_count() == 0);
4639
4640         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4641                 goto drop;
4642
4643         sband = local->hw.wiphy->bands[status->band];
4644         if (WARN_ON(!sband))
4645                 goto drop;
4646
4647         /*
4648          * If we're suspending, it is possible although not too likely
4649          * that we'd be receiving frames after having already partially
4650          * quiesced the stack. We can't process such frames then since
4651          * that might, for example, cause stations to be added or other
4652          * driver callbacks be invoked.
4653          */
4654         if (unlikely(local->quiescing || local->suspended))
4655                 goto drop;
4656
4657         /* We might be during a HW reconfig, prevent Rx for the same reason */
4658         if (unlikely(local->in_reconfig))
4659                 goto drop;
4660
4661         /*
4662          * The same happens when we're not even started,
4663          * but that's worth a warning.
4664          */
4665         if (WARN_ON(!local->started))
4666                 goto drop;
4667
4668         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4669                 /*
4670                  * Validate the rate, unless a PLCP error means that
4671                  * we probably can't have a valid rate here anyway.
4672                  */
4673
4674                 switch (status->encoding) {
4675                 case RX_ENC_HT:
4676                         /*
4677                          * rate_idx is MCS index, which can be [0-76]
4678                          * as documented on:
4679                          *
4680                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4681                          *
4682                          * Anything else would be some sort of driver or
4683                          * hardware error. The driver should catch hardware
4684                          * errors.
4685                          */
4686                         if (WARN(status->rate_idx > 76,
4687                                  "Rate marked as an HT rate but passed "
4688                                  "status->rate_idx is not "
4689                                  "an MCS index [0-76]: %d (0x%02x)\n",
4690                                  status->rate_idx,
4691                                  status->rate_idx))
4692                                 goto drop;
4693                         break;
4694                 case RX_ENC_VHT:
4695                         if (WARN_ONCE(status->rate_idx > 11 ||
4696                                       !status->nss ||
4697                                       status->nss > 8,
4698                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4699                                       status->rate_idx, status->nss))
4700                                 goto drop;
4701                         break;
4702                 case RX_ENC_HE:
4703                         if (WARN_ONCE(status->rate_idx > 11 ||
4704                                       !status->nss ||
4705                                       status->nss > 8,
4706                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4707                                       status->rate_idx, status->nss))
4708                                 goto drop;
4709                         break;
4710                 default:
4711                         WARN_ON_ONCE(1);
4712                         /* fall through */
4713                 case RX_ENC_LEGACY:
4714                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4715                                 goto drop;
4716                         rate = &sband->bitrates[status->rate_idx];
4717                 }
4718         }
4719
4720         status->rx_flags = 0;
4721
4722         /*
4723          * key references and virtual interfaces are protected using RCU
4724          * and this requires that we are in a read-side RCU section during
4725          * receive processing
4726          */
4727         rcu_read_lock();
4728
4729         /*
4730          * Frames with failed FCS/PLCP checksum are not returned,
4731          * all other frames are returned without radiotap header
4732          * if it was previously present.
4733          * Also, frames with less than 16 bytes are dropped.
4734          */
4735         skb = ieee80211_rx_monitor(local, skb, rate);
4736         if (!skb) {
4737                 rcu_read_unlock();
4738                 return;
4739         }
4740
4741         ieee80211_tpt_led_trig_rx(local,
4742                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4743                         skb->len);
4744
4745         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4746
4747         rcu_read_unlock();
4748
4749         return;
4750  drop:
4751         kfree_skb(skb);
4752 }
4753 EXPORT_SYMBOL(ieee80211_rx_napi);
4754
4755 /* This is a version of the rx handler that can be called from hard irq
4756  * context. Post the skb on the queue and schedule the tasklet */
4757 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4758 {
4759         struct ieee80211_local *local = hw_to_local(hw);
4760
4761         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4762
4763         skb->pkt_type = IEEE80211_RX_MSG;
4764         skb_queue_tail(&local->skb_queue, skb);
4765         tasklet_schedule(&local->tasklet);
4766 }
4767 EXPORT_SYMBOL(ieee80211_rx_irqsafe);