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) 2018-2020 Intel Corporation
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <linux/bitops.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  36 {
  37         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  38
  39         u64_stats_update_begin(&tstats->syncp);
  40         tstats->rx_packets++;
  41         tstats->rx_bytes += len;
  42         u64_stats_update_end(&tstats->syncp);
  43 }
  44
  45 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                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 424         else if (status->encoding != RX_ENC_LEGACY)
 425                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 426         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 427                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 428         else if (rate)
 429                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 430         else
 431                 channel_flags |= IEEE80211_CHAN_2GHZ;
 432         put_unaligned_le16(channel_flags, pos);
 433         pos += 2;
 434
 435         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 436         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 437             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 438                 *pos = status->signal;
 439                 rthdr->it_present |=
 440                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 441                 pos++;
 442         }
 443
 444         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 445
 446         if (!status->chains) {
 447                 /* IEEE80211_RADIOTAP_ANTENNA */
 448                 *pos = status->antenna;
 449                 pos++;
 450         }
 451
 452         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 453
 454         /* IEEE80211_RADIOTAP_RX_FLAGS */
 455         /* ensure 2 byte alignment for the 2 byte field as required */
 456         if ((pos - (u8 *)rthdr) & 1)
 457                 *pos++ = 0;
 458         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 459                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 460         put_unaligned_le16(rx_flags, pos);
 461         pos += 2;
 462
 463         if (status->encoding == RX_ENC_HT) {
 464                 unsigned int stbc;
 465
 466                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 467                 *pos++ = local->hw.radiotap_mcs_details;
 468                 *pos = 0;
 469                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 470                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 471                 if (status->bw == RATE_INFO_BW_40)
 472                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 473                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 474                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 475                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 476                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 477                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 478                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 479                 pos++;
 480                 *pos++ = status->rate_idx;
 481         }
 482
 483         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 484                 u16 flags = 0;
 485
 486                 /* ensure 4 byte alignment */
 487                 while ((pos - (u8 *)rthdr) & 3)
 488                         pos++;
 489                 rthdr->it_present |=
 490                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 491                 put_unaligned_le32(status->ampdu_reference, pos);
 492                 pos += 4;
 493                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 494                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 495                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 496                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 497                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 498                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 499                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 500                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 501                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 502                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 503                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 504                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 505                 put_unaligned_le16(flags, pos);
 506                 pos += 2;
 507                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 508                         *pos++ = status->ampdu_delimiter_crc;
 509                 else
 510                         *pos++ = 0;
 511                 *pos++ = 0;
 512         }
 513
 514         if (status->encoding == RX_ENC_VHT) {
 515                 u16 known = local->hw.radiotap_vht_details;
 516
 517                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 518                 put_unaligned_le16(known, pos);
 519                 pos += 2;
 520                 /* flags */
 521                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 522                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 523                 /* in VHT, STBC is binary */
 524                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 526                 if (status->enc_flags & RX_ENC_FLAG_BF)
 527                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 528                 pos++;
 529                 /* bandwidth */
 530                 switch (status->bw) {
 531                 case RATE_INFO_BW_80:
 532                         *pos++ = 4;
 533                         break;
 534                 case RATE_INFO_BW_160:
 535                         *pos++ = 11;
 536                         break;
 537                 case RATE_INFO_BW_40:
 538                         *pos++ = 1;
 539                         break;
 540                 default:
 541                         *pos++ = 0;
 542                 }
 543                 /* MCS/NSS */
 544                 *pos = (status->rate_idx << 4) | status->nss;
 545                 pos += 4;
 546                 /* coding field */
 547                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 548                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 549                 pos++;
 550                 /* group ID */
 551                 pos++;
 552                 /* partial_aid */
 553                 pos += 2;
 554         }
 555
 556         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 557                 u16 accuracy = 0;
 558                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 559
 560                 rthdr->it_present |=
 561                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 562
 563                 /* ensure 8 byte alignment */
 564                 while ((pos - (u8 *)rthdr) & 7)
 565                         pos++;
 566
 567                 put_unaligned_le64(status->device_timestamp, pos);
 568                 pos += sizeof(u64);
 569
 570                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 571                         accuracy = local->hw.radiotap_timestamp.accuracy;
 572                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 573                 }
 574                 put_unaligned_le16(accuracy, pos);
 575                 pos += sizeof(u16);
 576
 577                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 578                 *pos++ = flags;
 579         }
 580
 581         if (status->encoding == RX_ENC_HE &&
 582             status->flag & RX_FLAG_RADIOTAP_HE) {
 583 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 584
 585                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 586                         he.data6 |= HE_PREP(DATA6_NSTS,
 587                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 588                                                       status->enc_flags));
 589                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 590                 } else {
 591                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 592                 }
 593
 594 #define CHECK_GI(s) \
 595         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 596                      (int)NL80211_RATE_INFO_HE_GI_##s)
 597
 598                 CHECK_GI(0_8);
 599                 CHECK_GI(1_6);
 600                 CHECK_GI(3_2);
 601
 602                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 603                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 604                 he.data3 |= HE_PREP(DATA3_CODING,
 605                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 606
 607                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 608
 609                 switch (status->bw) {
 610                 case RATE_INFO_BW_20:
 611                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 612                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 613                         break;
 614                 case RATE_INFO_BW_40:
 615                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 616                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 617                         break;
 618                 case RATE_INFO_BW_80:
 619                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 620                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 621                         break;
 622                 case RATE_INFO_BW_160:
 623                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 624                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 625                         break;
 626                 case RATE_INFO_BW_HE_RU:
 627 #define CHECK_RU_ALLOC(s) \
 628         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 629                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 630
 631                         CHECK_RU_ALLOC(26);
 632                         CHECK_RU_ALLOC(52);
 633                         CHECK_RU_ALLOC(106);
 634                         CHECK_RU_ALLOC(242);
 635                         CHECK_RU_ALLOC(484);
 636                         CHECK_RU_ALLOC(996);
 637                         CHECK_RU_ALLOC(2x996);
 638
 639                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 640                                             status->he_ru + 4);
 641                         break;
 642                 default:
 643                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 644                 }
 645
 646                 /* ensure 2 byte alignment */
 647                 while ((pos - (u8 *)rthdr) & 1)
 648                         pos++;
 649                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 650                 memcpy(pos, &he, sizeof(he));
 651                 pos += sizeof(he);
 652         }
 653
 654         if (status->encoding == RX_ENC_HE &&
 655             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 656                 /* ensure 2 byte alignment */
 657                 while ((pos - (u8 *)rthdr) & 1)
 658                         pos++;
 659                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 660                 memcpy(pos, &he_mu, sizeof(he_mu));
 661                 pos += sizeof(he_mu);
 662         }
 663
 664         if (status->flag & RX_FLAG_NO_PSDU) {
 665                 rthdr->it_present |=
 666                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 667                 *pos++ = status->zero_length_psdu_type;
 668         }
 669
 670         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 671                 /* ensure 2 byte alignment */
 672                 while ((pos - (u8 *)rthdr) & 1)
 673                         pos++;
 674                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 675                 memcpy(pos, &lsig, sizeof(lsig));
 676                 pos += sizeof(lsig);
 677         }
 678
 679         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 680                 *pos++ = status->chain_signal[chain];
 681                 *pos++ = chain;
 682         }
 683
 684         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 685                 /* ensure 2 byte alignment for the vendor field as required */
 686                 if ((pos - (u8 *)rthdr) & 1)
 687                         *pos++ = 0;
 688                 *pos++ = rtap.oui[0];
 689                 *pos++ = rtap.oui[1];
 690                 *pos++ = rtap.oui[2];
 691                 *pos++ = rtap.subns;
 692                 put_unaligned_le16(rtap.len, pos);
 693                 pos += 2;
 694                 /* align the actual payload as requested */
 695                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 696                         *pos++ = 0;
 697                 /* data (and possible padding) already follows */
 698         }
 699 }
 700
 701 static struct sk_buff *
 702 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 703                            struct sk_buff **origskb,
 704                            struct ieee80211_rate *rate,
 705                            int rtap_space, bool use_origskb)
 706 {
 707         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 708         int rt_hdrlen, needed_headroom;
 709         struct sk_buff *skb;
 710
 711         /* room for the radiotap header based on driver features */
 712         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 713         needed_headroom = rt_hdrlen - rtap_space;
 714
 715         if (use_origskb) {
 716                 /* only need to expand headroom if necessary */
 717                 skb = *origskb;
 718                 *origskb = NULL;
 719
 720                 /*
 721                  * This shouldn't trigger often because most devices have an
 722                  * RX header they pull before we get here, and that should
 723                  * be big enough for our radiotap information. We should
 724                  * probably export the length to drivers so that we can have
 725                  * them allocate enough headroom to start with.
 726                  */
 727                 if (skb_headroom(skb) < needed_headroom &&
 728                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 729                         dev_kfree_skb(skb);
 730                         return NULL;
 731                 }
 732         } else {
 733                 /*
 734                  * Need to make a copy and possibly remove radiotap header
 735                  * and FCS from the original.
 736                  */
 737                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 738
 739                 if (!skb)
 740                         return NULL;
 741         }
 742
 743         /* prepend radiotap information */
 744         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 745
 746         skb_reset_mac_header(skb);
 747         skb->ip_summed = CHECKSUM_UNNECESSARY;
 748         skb->pkt_type = PACKET_OTHERHOST;
 749         skb->protocol = htons(ETH_P_802_2);
 750
 751         return skb;
 752 }
 753
 754 /*
 755  * This function copies a received frame to all monitor interfaces and
 756  * returns a cleaned-up SKB that no longer includes the FCS nor the
 757  * radiotap header the driver might have added.
 758  */
 759 static struct sk_buff *
 760 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 761                      struct ieee80211_rate *rate)
 762 {
 763         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 764         struct ieee80211_sub_if_data *sdata;
 765         struct sk_buff *monskb = NULL;
 766         int present_fcs_len = 0;
 767         unsigned int rtap_space = 0;
 768         struct ieee80211_sub_if_data *monitor_sdata =
 769                 rcu_dereference(local->monitor_sdata);
 770         bool only_monitor = false;
 771         unsigned int min_head_len;
 772
 773         if (status->flag & RX_FLAG_RADIOTAP_HE)
 774                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 775
 776         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 777                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 778
 779         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 780                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 781
 782         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 783                 struct ieee80211_vendor_radiotap *rtap =
 784                         (void *)(origskb->data + rtap_space);
 785
 786                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 787         }
 788
 789         min_head_len = rtap_space;
 790
 791         /*
 792          * First, we may need to make a copy of the skb because
 793          *  (1) we need to modify it for radiotap (if not present), and
 794          *  (2) the other RX handlers will modify the skb we got.
 795          *
 796          * We don't need to, of course, if we aren't going to return
 797          * the SKB because it has a bad FCS/PLCP checksum.
 798          */
 799
 800         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 801                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 802                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 803                                 /* driver bug */
 804                                 WARN_ON(1);
 805                                 dev_kfree_skb(origskb);
 806                                 return NULL;
 807                         }
 808                         present_fcs_len = FCS_LEN;
 809                 }
 810
 811                 /* also consider the hdr->frame_control */
 812                 min_head_len += 2;
 813         }
 814
 815         /* ensure that the expected data elements are in skb head */
 816         if (!pskb_may_pull(origskb, min_head_len)) {
 817                 dev_kfree_skb(origskb);
 818                 return NULL;
 819         }
 820
 821         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 822
 823         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 824                 if (only_monitor) {
 825                         dev_kfree_skb(origskb);
 826                         return NULL;
 827                 }
 828
 829                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 830                 return origskb;
 831         }
 832
 833         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 834
 835         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 836                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 837                                                  &local->mon_list);
 838
 839                 if (!monskb)
 840                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 841                                                             rate, rtap_space,
 842                                                             only_monitor &&
 843                                                             last_monitor);
 844
 845                 if (monskb) {
 846                         struct sk_buff *skb;
 847
 848                         if (last_monitor) {
 849                                 skb = monskb;
 850                                 monskb = NULL;
 851                         } else {
 852                                 skb = skb_clone(monskb, GFP_ATOMIC);
 853                         }
 854
 855                         if (skb) {
 856                                 skb->dev = sdata->dev;
 857                                 ieee80211_rx_stats(skb->dev, skb->len);
 858                                 netif_receive_skb(skb);
 859                         }
 860                 }
 861
 862                 if (last_monitor)
 863                         break;
 864         }
 865
 866         /* this happens if last_monitor was erroneously false */
 867         dev_kfree_skb(monskb);
 868
 869         /* ditto */
 870         if (!origskb)
 871                 return NULL;
 872
 873         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 874         return origskb;
 875 }
 876
 877 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 878 {
 879         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 880         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 881         int tid, seqno_idx, security_idx;
 882
 883         /* does the frame have a qos control field? */
 884         if (ieee80211_is_data_qos(hdr->frame_control)) {
 885                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 886                 /* frame has qos control */
 887                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 888                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 889                         status->rx_flags |= IEEE80211_RX_AMSDU;
 890
 891                 seqno_idx = tid;
 892                 security_idx = tid;
 893         } else {
 894                 /*
 895                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 896                  *
 897                  *      Sequence numbers for management frames, QoS data
 898                  *      frames with a broadcast/multicast address in the
 899                  *      Address 1 field, and all non-QoS data frames sent
 900                  *      by QoS STAs are assigned using an additional single
 901                  *      modulo-4096 counter, [...]
 902                  *
 903                  * We also use that counter for non-QoS STAs.
 904                  */
 905                 seqno_idx = IEEE80211_NUM_TIDS;
 906                 security_idx = 0;
 907                 if (ieee80211_is_mgmt(hdr->frame_control))
 908                         security_idx = IEEE80211_NUM_TIDS;
 909                 tid = 0;
 910         }
 911
 912         rx->seqno_idx = seqno_idx;
 913         rx->security_idx = security_idx;
 914         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 915          * For now, set skb->priority to 0 for other cases. */
 916         rx->skb->priority = (tid > 7) ? 0 : tid;
 917 }
 918
 919 /**
 920  * DOC: Packet alignment
 921  *
 922  * Drivers always need to pass packets that are aligned to two-byte boundaries
 923  * to the stack.
 924  *
 925  * Additionally, should, if possible, align the payload data in a way that
 926  * guarantees that the contained IP header is aligned to a four-byte
 927  * boundary. In the case of regular frames, this simply means aligning the
 928  * payload to a four-byte boundary (because either the IP header is directly
 929  * contained, or IV/RFC1042 headers that have a length divisible by four are
 930  * in front of it).  If the payload data is not properly aligned and the
 931  * architecture doesn't support efficient unaligned operations, mac80211
 932  * will align the data.
 933  *
 934  * With A-MSDU frames, however, the payload data address must yield two modulo
 935  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 936  * push the IP header further back to a multiple of four again. Thankfully, the
 937  * specs were sane enough this time around to require padding each A-MSDU
 938  * subframe to a length that is a multiple of four.
 939  *
 940  * Padding like Atheros hardware adds which is between the 802.11 header and
 941  * the payload is not supported, the driver is required to move the 802.11
 942  * header to be directly in front of the payload in that case.
 943  */
 944 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 945 {
 946 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 947         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 948 #endif
 949 }
 950
 951
 952 /* rx handlers */
 953
 954 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 955 {
 956         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 957
 958         if (is_multicast_ether_addr(hdr->addr1))
 959                 return 0;
 960
 961         return ieee80211_is_robust_mgmt_frame(skb);
 962 }
 963
 964
 965 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 966 {
 967         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 968
 969         if (!is_multicast_ether_addr(hdr->addr1))
 970                 return 0;
 971
 972         return ieee80211_is_robust_mgmt_frame(skb);
 973 }
 974
 975
 976 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 977 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 978 {
 979         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 980         struct ieee80211_mmie *mmie;
 981         struct ieee80211_mmie_16 *mmie16;
 982
 983         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 984                 return -1;
 985
 986         if (!ieee80211_is_robust_mgmt_frame(skb) &&
 987             !ieee80211_is_beacon(hdr->frame_control))
 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_BLOCKACK &&
1404             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1405                 goto dont_reorder;
1406
1407         /* new, potentially un-ordered, ampdu frame - process it */
1408
1409         /* reset session timer */
1410         if (tid_agg_rx->timeout)
1411                 tid_agg_rx->last_rx = jiffies;
1412
1413         /* if this mpdu is fragmented - terminate rx aggregation session */
1414         sc = le16_to_cpu(hdr->seq_ctrl);
1415         if (sc & IEEE80211_SCTL_FRAG) {
1416                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1417                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1418                 return;
1419         }
1420
1421         /*
1422          * No locking needed -- we will only ever process one
1423          * RX packet at a time, and thus own tid_agg_rx. All
1424          * other code manipulating it needs to (and does) make
1425          * sure that we cannot get to it any more before doing
1426          * anything with it.
1427          */
1428         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1429                                              frames))
1430                 return;
1431
1432  dont_reorder:
1433         __skb_queue_tail(frames, skb);
1434 }
1435
1436 static ieee80211_rx_result debug_noinline
1437 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1438 {
1439         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1440         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1441
1442         if (status->flag & RX_FLAG_DUP_VALIDATED)
1443                 return RX_CONTINUE;
1444
1445         /*
1446          * Drop duplicate 802.11 retransmissions
1447          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1448          */
1449
1450         if (rx->skb->len < 24)
1451                 return RX_CONTINUE;
1452
1453         if (ieee80211_is_ctl(hdr->frame_control) ||
1454             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1455             is_multicast_ether_addr(hdr->addr1))
1456                 return RX_CONTINUE;
1457
1458         if (!rx->sta)
1459                 return RX_CONTINUE;
1460
1461         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1462                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1463                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1464                 rx->sta->rx_stats.num_duplicates++;
1465                 return RX_DROP_UNUSABLE;
1466         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1467                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1468         }
1469
1470         return RX_CONTINUE;
1471 }
1472
1473 static ieee80211_rx_result debug_noinline
1474 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1475 {
1476         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1477
1478         /* Drop disallowed frame classes based on STA auth/assoc state;
1479          * IEEE 802.11, Chap 5.5.
1480          *
1481          * mac80211 filters only based on association state, i.e. it drops
1482          * Class 3 frames from not associated stations. hostapd sends
1483          * deauth/disassoc frames when needed. In addition, hostapd is
1484          * responsible for filtering on both auth and assoc states.
1485          */
1486
1487         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1488                 return ieee80211_rx_mesh_check(rx);
1489
1490         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1491                       ieee80211_is_pspoll(hdr->frame_control)) &&
1492                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1493                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1494                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1495                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1496                 /*
1497                  * accept port control frames from the AP even when it's not
1498                  * yet marked ASSOC to prevent a race where we don't set the
1499                  * assoc bit quickly enough before it sends the first frame
1500                  */
1501                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1502                     ieee80211_is_data_present(hdr->frame_control)) {
1503                         unsigned int hdrlen;
1504                         __be16 ethertype;
1505
1506                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1507
1508                         if (rx->skb->len < hdrlen + 8)
1509                                 return RX_DROP_MONITOR;
1510
1511                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1512                         if (ethertype == rx->sdata->control_port_protocol)
1513                                 return RX_CONTINUE;
1514                 }
1515
1516                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1517                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1518                                                hdr->addr2,
1519                                                GFP_ATOMIC))
1520                         return RX_DROP_UNUSABLE;
1521
1522                 return RX_DROP_MONITOR;
1523         }
1524
1525         return RX_CONTINUE;
1526 }
1527
1528
1529 static ieee80211_rx_result debug_noinline
1530 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1531 {
1532         struct ieee80211_local *local;
1533         struct ieee80211_hdr *hdr;
1534         struct sk_buff *skb;
1535
1536         local = rx->local;
1537         skb = rx->skb;
1538         hdr = (struct ieee80211_hdr *) skb->data;
1539
1540         if (!local->pspolling)
1541                 return RX_CONTINUE;
1542
1543         if (!ieee80211_has_fromds(hdr->frame_control))
1544                 /* this is not from AP */
1545                 return RX_CONTINUE;
1546
1547         if (!ieee80211_is_data(hdr->frame_control))
1548                 return RX_CONTINUE;
1549
1550         if (!ieee80211_has_moredata(hdr->frame_control)) {
1551                 /* AP has no more frames buffered for us */
1552                 local->pspolling = false;
1553                 return RX_CONTINUE;
1554         }
1555
1556         /* more data bit is set, let's request a new frame from the AP */
1557         ieee80211_send_pspoll(local, rx->sdata);
1558
1559         return RX_CONTINUE;
1560 }
1561
1562 static void sta_ps_start(struct sta_info *sta)
1563 {
1564         struct ieee80211_sub_if_data *sdata = sta->sdata;
1565         struct ieee80211_local *local = sdata->local;
1566         struct ps_data *ps;
1567         int tid;
1568
1569         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1570             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1571                 ps = &sdata->bss->ps;
1572         else
1573                 return;
1574
1575         atomic_inc(&ps->num_sta_ps);
1576         set_sta_flag(sta, WLAN_STA_PS_STA);
1577         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1578                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1579         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1580                sta->sta.addr, sta->sta.aid);
1581
1582         ieee80211_clear_fast_xmit(sta);
1583
1584         if (!sta->sta.txq[0])
1585                 return;
1586
1587         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1588                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1589                 struct txq_info *txqi = to_txq_info(txq);
1590
1591                 spin_lock(&local->active_txq_lock[txq->ac]);
1592                 if (!list_empty(&txqi->schedule_order))
1593                         list_del_init(&txqi->schedule_order);
1594                 spin_unlock(&local->active_txq_lock[txq->ac]);
1595
1596                 if (txq_has_queue(txq))
1597                         set_bit(tid, &sta->txq_buffered_tids);
1598                 else
1599                         clear_bit(tid, &sta->txq_buffered_tids);
1600         }
1601 }
1602
1603 static void sta_ps_end(struct sta_info *sta)
1604 {
1605         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1606                sta->sta.addr, sta->sta.aid);
1607
1608         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1609                 /*
1610                  * Clear the flag only if the other one is still set
1611                  * so that the TX path won't start TX'ing new frames
1612                  * directly ... In the case that the driver flag isn't
1613                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1614                  */
1615                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1616                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1617                        sta->sta.addr, sta->sta.aid);
1618                 return;
1619         }
1620
1621         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1622         clear_sta_flag(sta, WLAN_STA_PS_STA);
1623         ieee80211_sta_ps_deliver_wakeup(sta);
1624 }
1625
1626 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1627 {
1628         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1629         bool in_ps;
1630
1631         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1632
1633         /* Don't let the same PS state be set twice */
1634         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1635         if ((start && in_ps) || (!start && !in_ps))
1636                 return -EINVAL;
1637
1638         if (start)
1639                 sta_ps_start(sta);
1640         else
1641                 sta_ps_end(sta);
1642
1643         return 0;
1644 }
1645 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1646
1647 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1648 {
1649         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1650
1651         if (test_sta_flag(sta, WLAN_STA_SP))
1652                 return;
1653
1654         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1655                 ieee80211_sta_ps_deliver_poll_response(sta);
1656         else
1657                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1658 }
1659 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1660
1661 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1662 {
1663         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1664         int ac = ieee80211_ac_from_tid(tid);
1665
1666         /*
1667          * If this AC is not trigger-enabled do nothing unless the
1668          * driver is calling us after it already checked.
1669          *
1670          * NB: This could/should check a separate bitmap of trigger-
1671          * enabled queues, but for now we only implement uAPSD w/o
1672          * TSPEC changes to the ACs, so they're always the same.
1673          */
1674         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1675             tid != IEEE80211_NUM_TIDS)
1676                 return;
1677
1678         /* if we are in a service period, do nothing */
1679         if (test_sta_flag(sta, WLAN_STA_SP))
1680                 return;
1681
1682         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1683                 ieee80211_sta_ps_deliver_uapsd(sta);
1684         else
1685                 set_sta_flag(sta, WLAN_STA_UAPSD);
1686 }
1687 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1688
1689 static ieee80211_rx_result debug_noinline
1690 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1691 {
1692         struct ieee80211_sub_if_data *sdata = rx->sdata;
1693         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1694         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1695
1696         if (!rx->sta)
1697                 return RX_CONTINUE;
1698
1699         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1700             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1701                 return RX_CONTINUE;
1702
1703         /*
1704          * The device handles station powersave, so don't do anything about
1705          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1706          * it to mac80211 since they're handled.)
1707          */
1708         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1709                 return RX_CONTINUE;
1710
1711         /*
1712          * Don't do anything if the station isn't already asleep. In
1713          * the uAPSD case, the station will probably be marked asleep,
1714          * in the PS-Poll case the station must be confused ...
1715          */
1716         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1717                 return RX_CONTINUE;
1718
1719         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1720                 ieee80211_sta_pspoll(&rx->sta->sta);
1721
1722                 /* Free PS Poll skb here instead of returning RX_DROP that would
1723                  * count as an dropped frame. */
1724                 dev_kfree_skb(rx->skb);
1725
1726                 return RX_QUEUED;
1727         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1728                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1729                    ieee80211_has_pm(hdr->frame_control) &&
1730                    (ieee80211_is_data_qos(hdr->frame_control) ||
1731                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1732                 u8 tid = ieee80211_get_tid(hdr);
1733
1734                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1735         }
1736
1737         return RX_CONTINUE;
1738 }
1739
1740 static ieee80211_rx_result debug_noinline
1741 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1742 {
1743         struct sta_info *sta = rx->sta;
1744         struct sk_buff *skb = rx->skb;
1745         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1746         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1747         int i;
1748
1749         if (!sta)
1750                 return RX_CONTINUE;
1751
1752         /*
1753          * Update last_rx only for IBSS packets which are for the current
1754          * BSSID and for station already AUTHORIZED to avoid keeping the
1755          * current IBSS network alive in cases where other STAs start
1756          * using different BSSID. This will also give the station another
1757          * chance to restart the authentication/authorization in case
1758          * something went wrong the first time.
1759          */
1760         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1761                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1762                                                 NL80211_IFTYPE_ADHOC);
1763                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1764                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1765                         sta->rx_stats.last_rx = jiffies;
1766                         if (ieee80211_is_data(hdr->frame_control) &&
1767                             !is_multicast_ether_addr(hdr->addr1))
1768                                 sta->rx_stats.last_rate =
1769                                         sta_stats_encode_rate(status);
1770                 }
1771         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1772                 sta->rx_stats.last_rx = jiffies;
1773         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1774                 /*
1775                  * Mesh beacons will update last_rx when if they are found to
1776                  * match the current local configuration when processed.
1777                  */
1778                 sta->rx_stats.last_rx = jiffies;
1779                 if (ieee80211_is_data(hdr->frame_control))
1780                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1781         }
1782
1783         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1784                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1785
1786         sta->rx_stats.fragments++;
1787
1788         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1789         sta->rx_stats.bytes += rx->skb->len;
1790         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1791
1792         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1793                 sta->rx_stats.last_signal = status->signal;
1794                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1795         }
1796
1797         if (status->chains) {
1798                 sta->rx_stats.chains = status->chains;
1799                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1800                         int signal = status->chain_signal[i];
1801
1802                         if (!(status->chains & BIT(i)))
1803                                 continue;
1804
1805                         sta->rx_stats.chain_signal_last[i] = signal;
1806                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1807                                         -signal);
1808                 }
1809         }
1810
1811         /*
1812          * Change STA power saving mode only at the end of a frame
1813          * exchange sequence, and only for a data or management
1814          * frame as specified in IEEE 802.11-2016 11.2.3.2
1815          */
1816         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1817             !ieee80211_has_morefrags(hdr->frame_control) &&
1818             !is_multicast_ether_addr(hdr->addr1) &&
1819             (ieee80211_is_mgmt(hdr->frame_control) ||
1820              ieee80211_is_data(hdr->frame_control)) &&
1821             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1822             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1823              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1824                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1825                         if (!ieee80211_has_pm(hdr->frame_control))
1826                                 sta_ps_end(sta);
1827                 } else {
1828                         if (ieee80211_has_pm(hdr->frame_control))
1829                                 sta_ps_start(sta);
1830                 }
1831         }
1832
1833         /* mesh power save support */
1834         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1835                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1836
1837         /*
1838          * Drop (qos-)data::nullfunc frames silently, since they
1839          * are used only to control station power saving mode.
1840          */
1841         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1842                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1843
1844                 /*
1845                  * If we receive a 4-addr nullfunc frame from a STA
1846                  * that was not moved to a 4-addr STA vlan yet send
1847                  * the event to userspace and for older hostapd drop
1848                  * the frame to the monitor interface.
1849                  */
1850                 if (ieee80211_has_a4(hdr->frame_control) &&
1851                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1852                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1853                       !rx->sdata->u.vlan.sta))) {
1854                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1855                                 cfg80211_rx_unexpected_4addr_frame(
1856                                         rx->sdata->dev, sta->sta.addr,
1857                                         GFP_ATOMIC);
1858                         return RX_DROP_MONITOR;
1859                 }
1860                 /*
1861                  * Update counter and free packet here to avoid
1862                  * counting this as a dropped packed.
1863                  */
1864                 sta->rx_stats.packets++;
1865                 dev_kfree_skb(rx->skb);
1866                 return RX_QUEUED;
1867         }
1868
1869         return RX_CONTINUE;
1870 } /* ieee80211_rx_h_sta_process */
1871
1872 static struct ieee80211_key *
1873 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1874 {
1875         struct ieee80211_key *key = NULL;
1876         struct ieee80211_sub_if_data *sdata = rx->sdata;
1877         int idx2;
1878
1879         /* Make sure key gets set if either BIGTK key index is set so that
1880          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1881          * Beacon frames and Beacon frames that claim to use another BIGTK key
1882          * index (i.e., a key that we do not have).
1883          */
1884
1885         if (idx < 0) {
1886                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1887                 idx2 = idx + 1;
1888         } else {
1889                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1890                         idx2 = idx + 1;
1891                 else
1892                         idx2 = idx - 1;
1893         }
1894
1895         if (rx->sta)
1896                 key = rcu_dereference(rx->sta->gtk[idx]);
1897         if (!key)
1898                 key = rcu_dereference(sdata->keys[idx]);
1899         if (!key && rx->sta)
1900                 key = rcu_dereference(rx->sta->gtk[idx2]);
1901         if (!key)
1902                 key = rcu_dereference(sdata->keys[idx2]);
1903
1904         return key;
1905 }
1906
1907 static ieee80211_rx_result debug_noinline
1908 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1909 {
1910         struct sk_buff *skb = rx->skb;
1911         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1912         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1913         int keyidx;
1914         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1915         struct ieee80211_key *sta_ptk = NULL;
1916         struct ieee80211_key *ptk_idx = NULL;
1917         int mmie_keyidx = -1;
1918         __le16 fc;
1919         const struct ieee80211_cipher_scheme *cs = NULL;
1920
1921         /*
1922          * Key selection 101
1923          *
1924          * There are five types of keys:
1925          *  - GTK (group keys)
1926          *  - IGTK (group keys for management frames)
1927          *  - BIGTK (group keys for Beacon frames)
1928          *  - PTK (pairwise keys)
1929          *  - STK (station-to-station pairwise keys)
1930          *
1931          * When selecting a key, we have to distinguish between multicast
1932          * (including broadcast) and unicast frames, the latter can only
1933          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1934          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1935          * then unicast frames can also use key indices like GTKs. Hence, if we
1936          * don't have a PTK/STK we check the key index for a WEP key.
1937          *
1938          * Note that in a regular BSS, multicast frames are sent by the
1939          * AP only, associated stations unicast the frame to the AP first
1940          * which then multicasts it on their behalf.
1941          *
1942          * There is also a slight problem in IBSS mode: GTKs are negotiated
1943          * with each station, that is something we don't currently handle.
1944          * The spec seems to expect that one negotiates the same key with
1945          * every station but there's no such requirement; VLANs could be
1946          * possible.
1947          */
1948
1949         /* start without a key */
1950         rx->key = NULL;
1951         fc = hdr->frame_control;
1952
1953         if (rx->sta) {
1954                 int keyid = rx->sta->ptk_idx;
1955                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1956
1957                 if (ieee80211_has_protected(fc)) {
1958                         cs = rx->sta->cipher_scheme;
1959                         keyid = ieee80211_get_keyid(rx->skb, cs);
1960
1961                         if (unlikely(keyid < 0))
1962                                 return RX_DROP_UNUSABLE;
1963
1964                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1965                 }
1966         }
1967
1968         if (!ieee80211_has_protected(fc))
1969                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1970
1971         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1972                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1973                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1974                     (status->flag & RX_FLAG_IV_STRIPPED))
1975                         return RX_CONTINUE;
1976                 /* Skip decryption if the frame is not protected. */
1977                 if (!ieee80211_has_protected(fc))
1978                         return RX_CONTINUE;
1979         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1980                 /* Broadcast/multicast robust management frame / BIP */
1981                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1982                     (status->flag & RX_FLAG_IV_STRIPPED))
1983                         return RX_CONTINUE;
1984
1985                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1986                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1987                     NUM_DEFAULT_BEACON_KEYS)
1988                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1989
1990                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1991                 if (!rx->key)
1992                         return RX_CONTINUE; /* Beacon protection not in use */
1993         } else if (mmie_keyidx >= 0) {
1994                 /* Broadcast/multicast robust management frame / BIP */
1995                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1996                     (status->flag & RX_FLAG_IV_STRIPPED))
1997                         return RX_CONTINUE;
1998
1999                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2000                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2001                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2002                 if (rx->sta) {
2003                         if (ieee80211_is_group_privacy_action(skb) &&
2004                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2005                                 return RX_DROP_MONITOR;
2006
2007                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2008                 }
2009                 if (!rx->key)
2010                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2011         } else if (!ieee80211_has_protected(fc)) {
2012                 /*
2013                  * The frame was not protected, so skip decryption. However, we
2014                  * need to set rx->key if there is a key that could have been
2015                  * used so that the frame may be dropped if encryption would
2016                  * have been expected.
2017                  */
2018                 struct ieee80211_key *key = NULL;
2019                 struct ieee80211_sub_if_data *sdata = rx->sdata;
2020                 int i;
2021
2022                 if (ieee80211_is_beacon(fc)) {
2023                         key = ieee80211_rx_get_bigtk(rx, -1);
2024                 } else if (ieee80211_is_mgmt(fc) &&
2025                            is_multicast_ether_addr(hdr->addr1)) {
2026                         key = rcu_dereference(rx->sdata->default_mgmt_key);
2027                 } else {
2028                         if (rx->sta) {
2029                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2030                                         key = rcu_dereference(rx->sta->gtk[i]);
2031                                         if (key)
2032                                                 break;
2033                                 }
2034                         }
2035                         if (!key) {
2036                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2037                                         key = rcu_dereference(sdata->keys[i]);
2038                                         if (key)
2039                                                 break;
2040                                 }
2041                         }
2042                 }
2043                 if (key)
2044                         rx->key = key;
2045                 return RX_CONTINUE;
2046         } else {
2047                 /*
2048                  * The device doesn't give us the IV so we won't be
2049                  * able to look up the key. That's ok though, we
2050                  * don't need to decrypt the frame, we just won't
2051                  * be able to keep statistics accurate.
2052                  * Except for key threshold notifications, should
2053                  * we somehow allow the driver to tell us which key
2054                  * the hardware used if this flag is set?
2055                  */
2056                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2057                     (status->flag & RX_FLAG_IV_STRIPPED))
2058                         return RX_CONTINUE;
2059
2060                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2061
2062                 if (unlikely(keyidx < 0))
2063                         return RX_DROP_UNUSABLE;
2064
2065                 /* check per-station GTK first, if multicast packet */
2066                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2067                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2068
2069                 /* if not found, try default key */
2070                 if (!rx->key) {
2071                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2072
2073                         /*
2074                          * RSNA-protected unicast frames should always be
2075                          * sent with pairwise or station-to-station keys,
2076                          * but for WEP we allow using a key index as well.
2077                          */
2078                         if (rx->key &&
2079                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2080                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2081                             !is_multicast_ether_addr(hdr->addr1))
2082                                 rx->key = NULL;
2083                 }
2084         }
2085
2086         if (rx->key) {
2087                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2088                         return RX_DROP_MONITOR;
2089
2090                 /* TODO: add threshold stuff again */
2091         } else {
2092                 return RX_DROP_MONITOR;
2093         }
2094
2095         switch (rx->key->conf.cipher) {
2096         case WLAN_CIPHER_SUITE_WEP40:
2097         case WLAN_CIPHER_SUITE_WEP104:
2098                 result = ieee80211_crypto_wep_decrypt(rx);
2099                 break;
2100         case WLAN_CIPHER_SUITE_TKIP:
2101                 result = ieee80211_crypto_tkip_decrypt(rx);
2102                 break;
2103         case WLAN_CIPHER_SUITE_CCMP:
2104                 result = ieee80211_crypto_ccmp_decrypt(
2105                         rx, IEEE80211_CCMP_MIC_LEN);
2106                 break;
2107         case WLAN_CIPHER_SUITE_CCMP_256:
2108                 result = ieee80211_crypto_ccmp_decrypt(
2109                         rx, IEEE80211_CCMP_256_MIC_LEN);
2110                 break;
2111         case WLAN_CIPHER_SUITE_AES_CMAC:
2112                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2113                 break;
2114         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2115                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2116                 break;
2117         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2118         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2119                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2120                 break;
2121         case WLAN_CIPHER_SUITE_GCMP:
2122         case WLAN_CIPHER_SUITE_GCMP_256:
2123                 result = ieee80211_crypto_gcmp_decrypt(rx);
2124                 break;
2125         default:
2126                 result = ieee80211_crypto_hw_decrypt(rx);
2127         }
2128
2129         /* the hdr variable is invalid after the decrypt handlers */
2130
2131         /* either the frame has been decrypted or will be dropped */
2132         status->flag |= RX_FLAG_DECRYPTED;
2133
2134         return result;
2135 }
2136
2137 static inline struct ieee80211_fragment_entry *
2138 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2139                          unsigned int frag, unsigned int seq, int rx_queue,
2140                          struct sk_buff **skb)
2141 {
2142         struct ieee80211_fragment_entry *entry;
2143
2144         entry = &sdata->fragments[sdata->fragment_next++];
2145         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2146                 sdata->fragment_next = 0;
2147
2148         if (!skb_queue_empty(&entry->skb_list))
2149                 __skb_queue_purge(&entry->skb_list);
2150
2151         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2152         *skb = NULL;
2153         entry->first_frag_time = jiffies;
2154         entry->seq = seq;
2155         entry->rx_queue = rx_queue;
2156         entry->last_frag = frag;
2157         entry->check_sequential_pn = false;
2158         entry->extra_len = 0;
2159
2160         return entry;
2161 }
2162
2163 static inline struct ieee80211_fragment_entry *
2164 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2165                           unsigned int frag, unsigned int seq,
2166                           int rx_queue, struct ieee80211_hdr *hdr)
2167 {
2168         struct ieee80211_fragment_entry *entry;
2169         int i, idx;
2170
2171         idx = sdata->fragment_next;
2172         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2173                 struct ieee80211_hdr *f_hdr;
2174                 struct sk_buff *f_skb;
2175
2176                 idx--;
2177                 if (idx < 0)
2178                         idx = IEEE80211_FRAGMENT_MAX - 1;
2179
2180                 entry = &sdata->fragments[idx];
2181                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2182                     entry->rx_queue != rx_queue ||
2183                     entry->last_frag + 1 != frag)
2184                         continue;
2185
2186                 f_skb = __skb_peek(&entry->skb_list);
2187                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2188
2189                 /*
2190                  * Check ftype and addresses are equal, else check next fragment
2191                  */
2192                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2193                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2194                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2195                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2196                         continue;
2197
2198                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2199                         __skb_queue_purge(&entry->skb_list);
2200                         continue;
2201                 }
2202                 return entry;
2203         }
2204
2205         return NULL;
2206 }
2207
2208 static ieee80211_rx_result debug_noinline
2209 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2210 {
2211         struct ieee80211_hdr *hdr;
2212         u16 sc;
2213         __le16 fc;
2214         unsigned int frag, seq;
2215         struct ieee80211_fragment_entry *entry;
2216         struct sk_buff *skb;
2217
2218         hdr = (struct ieee80211_hdr *)rx->skb->data;
2219         fc = hdr->frame_control;
2220
2221         if (ieee80211_is_ctl(fc))
2222                 return RX_CONTINUE;
2223
2224         sc = le16_to_cpu(hdr->seq_ctrl);
2225         frag = sc & IEEE80211_SCTL_FRAG;
2226
2227         if (is_multicast_ether_addr(hdr->addr1)) {
2228                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2229                 goto out_no_led;
2230         }
2231
2232         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2233                 goto out;
2234
2235         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2236
2237         if (skb_linearize(rx->skb))
2238                 return RX_DROP_UNUSABLE;
2239
2240         /*
2241          *  skb_linearize() might change the skb->data and
2242          *  previously cached variables (in this case, hdr) need to
2243          *  be refreshed with the new data.
2244          */
2245         hdr = (struct ieee80211_hdr *)rx->skb->data;
2246         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2247
2248         if (frag == 0) {
2249                 /* This is the first fragment of a new frame. */
2250                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2251                                                  rx->seqno_idx, &(rx->skb));
2252                 if (rx->key &&
2253                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2254                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2255                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2256                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2257                     ieee80211_has_protected(fc)) {
2258                         int queue = rx->security_idx;
2259
2260                         /* Store CCMP/GCMP PN so that we can verify that the
2261                          * next fragment has a sequential PN value.
2262                          */
2263                         entry->check_sequential_pn = true;
2264                         memcpy(entry->last_pn,
2265                                rx->key->u.ccmp.rx_pn[queue],
2266                                IEEE80211_CCMP_PN_LEN);
2267                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2268                                               u.ccmp.rx_pn) !=
2269                                      offsetof(struct ieee80211_key,
2270                                               u.gcmp.rx_pn));
2271                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2272                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2273                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2274                                      IEEE80211_GCMP_PN_LEN);
2275                 }
2276                 return RX_QUEUED;
2277         }
2278
2279         /* This is a fragment for a frame that should already be pending in
2280          * fragment cache. Add this fragment to the end of the pending entry.
2281          */
2282         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2283                                           rx->seqno_idx, hdr);
2284         if (!entry) {
2285                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2286                 return RX_DROP_MONITOR;
2287         }
2288
2289         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2290          *  MPDU PN values are not incrementing in steps of 1."
2291          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2292          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2293          */
2294         if (entry->check_sequential_pn) {
2295                 int i;
2296                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2297                 int queue;
2298
2299                 if (!rx->key ||
2300                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2301                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2302                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2303                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2304                         return RX_DROP_UNUSABLE;
2305                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2306                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2307                         pn[i]++;
2308                         if (pn[i])
2309                                 break;
2310                 }
2311                 queue = rx->security_idx;
2312                 rpn = rx->key->u.ccmp.rx_pn[queue];
2313                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2314                         return RX_DROP_UNUSABLE;
2315                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2316         }
2317
2318         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2319         __skb_queue_tail(&entry->skb_list, rx->skb);
2320         entry->last_frag = frag;
2321         entry->extra_len += rx->skb->len;
2322         if (ieee80211_has_morefrags(fc)) {
2323                 rx->skb = NULL;
2324                 return RX_QUEUED;
2325         }
2326
2327         rx->skb = __skb_dequeue(&entry->skb_list);
2328         if (skb_tailroom(rx->skb) < entry->extra_len) {
2329                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2330                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2331                                               GFP_ATOMIC))) {
2332                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2333                         __skb_queue_purge(&entry->skb_list);
2334                         return RX_DROP_UNUSABLE;
2335                 }
2336         }
2337         while ((skb = __skb_dequeue(&entry->skb_list))) {
2338                 skb_put_data(rx->skb, skb->data, skb->len);
2339                 dev_kfree_skb(skb);
2340         }
2341
2342  out:
2343         ieee80211_led_rx(rx->local);
2344  out_no_led:
2345         if (rx->sta)
2346                 rx->sta->rx_stats.packets++;
2347         return RX_CONTINUE;
2348 }
2349
2350 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2351 {
2352         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2353                 return -EACCES;
2354
2355         return 0;
2356 }
2357
2358 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2359 {
2360         struct sk_buff *skb = rx->skb;
2361         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2362
2363         /*
2364          * Pass through unencrypted frames if the hardware has
2365          * decrypted them already.
2366          */
2367         if (status->flag & RX_FLAG_DECRYPTED)
2368                 return 0;
2369
2370         /* Drop unencrypted frames if key is set. */
2371         if (unlikely(!ieee80211_has_protected(fc) &&
2372                      !ieee80211_is_any_nullfunc(fc) &&
2373                      ieee80211_is_data(fc) && rx->key))
2374                 return -EACCES;
2375
2376         return 0;
2377 }
2378
2379 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2380 {
2381         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2382         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2383         __le16 fc = hdr->frame_control;
2384
2385         /*
2386          * Pass through unencrypted frames if the hardware has
2387          * decrypted them already.
2388          */
2389         if (status->flag & RX_FLAG_DECRYPTED)
2390                 return 0;
2391
2392         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2393                 if (unlikely(!ieee80211_has_protected(fc) &&
2394                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2395                              rx->key)) {
2396                         if (ieee80211_is_deauth(fc) ||
2397                             ieee80211_is_disassoc(fc))
2398                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2399                                                              rx->skb->data,
2400                                                              rx->skb->len);
2401                         return -EACCES;
2402                 }
2403                 /* BIP does not use Protected field, so need to check MMIE */
2404                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2405                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2406                         if (ieee80211_is_deauth(fc) ||
2407                             ieee80211_is_disassoc(fc))
2408                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2409                                                              rx->skb->data,
2410                                                              rx->skb->len);
2411                         return -EACCES;
2412                 }
2413                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2414                              ieee80211_get_mmie_keyidx(rx->skb) < 0))
2415                         return -EACCES;
2416                 /*
2417                  * When using MFP, Action frames are not allowed prior to
2418                  * having configured keys.
2419                  */
2420                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2421                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2422                         return -EACCES;
2423         }
2424
2425         return 0;
2426 }
2427
2428 static int
2429 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2430 {
2431         struct ieee80211_sub_if_data *sdata = rx->sdata;
2432         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2433         bool check_port_control = false;
2434         struct ethhdr *ehdr;
2435         int ret;
2436
2437         *port_control = false;
2438         if (ieee80211_has_a4(hdr->frame_control) &&
2439             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2440                 return -1;
2441
2442         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2443             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2444
2445                 if (!sdata->u.mgd.use_4addr)
2446                         return -1;
2447                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2448                         check_port_control = true;
2449         }
2450
2451         if (is_multicast_ether_addr(hdr->addr1) &&
2452             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2453                 return -1;
2454
2455         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2456         if (ret < 0)
2457                 return ret;
2458
2459         ehdr = (struct ethhdr *) rx->skb->data;
2460         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2461                 *port_control = true;
2462         else if (check_port_control)
2463                 return -1;
2464
2465         return 0;
2466 }
2467
2468 /*
2469  * requires that rx->skb is a frame with ethernet header
2470  */
2471 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2472 {
2473         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2474                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2475         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2476
2477         /*
2478          * Allow EAPOL frames to us/the PAE group address regardless
2479          * of whether the frame was encrypted or not.
2480          */
2481         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2482             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2483              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2484                 return true;
2485
2486         if (ieee80211_802_1x_port_control(rx) ||
2487             ieee80211_drop_unencrypted(rx, fc))
2488                 return false;
2489
2490         return true;
2491 }
2492
2493 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2494                                                  struct ieee80211_rx_data *rx)
2495 {
2496         struct ieee80211_sub_if_data *sdata = rx->sdata;
2497         struct net_device *dev = sdata->dev;
2498
2499         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2500                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2501                       !sdata->control_port_no_preauth)) &&
2502                      sdata->control_port_over_nl80211)) {
2503                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2504                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2505
2506                 cfg80211_rx_control_port(dev, skb, noencrypt);
2507                 dev_kfree_skb(skb);
2508         } else {
2509                 memset(skb->cb, 0, sizeof(skb->cb));
2510
2511                 /* deliver to local stack */
2512                 if (rx->napi)
2513                         napi_gro_receive(rx->napi, skb);
2514                 else
2515                         netif_receive_skb(skb);
2516         }
2517 }
2518
2519 /*
2520  * requires that rx->skb is a frame with ethernet header
2521  */
2522 static void
2523 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2524 {
2525         struct ieee80211_sub_if_data *sdata = rx->sdata;
2526         struct net_device *dev = sdata->dev;
2527         struct sk_buff *skb, *xmit_skb;
2528         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2529         struct sta_info *dsta;
2530
2531         skb = rx->skb;
2532         xmit_skb = NULL;
2533
2534         ieee80211_rx_stats(dev, skb->len);
2535
2536         if (rx->sta) {
2537                 /* The seqno index has the same property as needed
2538                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2539                  * for non-QoS-data frames. Here we know it's a data
2540                  * frame, so count MSDUs.
2541                  */
2542                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2543                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2544                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2545         }
2546
2547         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2548              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2549             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2550             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2551                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2552                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2553                         /*
2554                          * send multicast frames both to higher layers in
2555                          * local net stack and back to the wireless medium
2556                          */
2557                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2558                         if (!xmit_skb)
2559                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2560                                                     dev->name);
2561                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2562                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2563                         dsta = sta_info_get(sdata, ehdr->h_dest);
2564                         if (dsta) {
2565                                 /*
2566                                  * The destination station is associated to
2567                                  * this AP (in this VLAN), so send the frame
2568                                  * directly to it and do not pass it to local
2569                                  * net stack.
2570                                  */
2571                                 xmit_skb = skb;
2572                                 skb = NULL;
2573                         }
2574                 }
2575         }
2576
2577 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2578         if (skb) {
2579                 /* 'align' will only take the values 0 or 2 here since all
2580                  * frames are required to be aligned to 2-byte boundaries
2581                  * when being passed to mac80211; the code here works just
2582                  * as well if that isn't true, but mac80211 assumes it can
2583                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2584                  */
2585                 int align;
2586
2587                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2588                 if (align) {
2589                         if (WARN_ON(skb_headroom(skb) < 3)) {
2590                                 dev_kfree_skb(skb);
2591                                 skb = NULL;
2592                         } else {
2593                                 u8 *data = skb->data;
2594                                 size_t len = skb_headlen(skb);
2595                                 skb->data -= align;
2596                                 memmove(skb->data, data, len);
2597                                 skb_set_tail_pointer(skb, len);
2598                         }
2599                 }
2600         }
2601 #endif
2602
2603         if (skb) {
2604                 skb->protocol = eth_type_trans(skb, dev);
2605                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2606         }
2607
2608         if (xmit_skb) {
2609                 /*
2610                  * Send to wireless media and increase priority by 256 to
2611                  * keep the received priority instead of reclassifying
2612                  * the frame (see cfg80211_classify8021d).
2613                  */
2614                 xmit_skb->priority += 256;
2615                 xmit_skb->protocol = htons(ETH_P_802_3);
2616                 skb_reset_network_header(xmit_skb);
2617                 skb_reset_mac_header(xmit_skb);
2618                 dev_queue_xmit(xmit_skb);
2619         }
2620 }
2621
2622 static ieee80211_rx_result debug_noinline
2623 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2624 {
2625         struct net_device *dev = rx->sdata->dev;
2626         struct sk_buff *skb = rx->skb;
2627         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2628         __le16 fc = hdr->frame_control;
2629         struct sk_buff_head frame_list;
2630         struct ethhdr ethhdr;
2631         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2632
2633         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2634                 check_da = NULL;
2635                 check_sa = NULL;
2636         } else switch (rx->sdata->vif.type) {
2637                 case NL80211_IFTYPE_AP:
2638                 case NL80211_IFTYPE_AP_VLAN:
2639                         check_da = NULL;
2640                         break;
2641                 case NL80211_IFTYPE_STATION:
2642                         if (!rx->sta ||
2643                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2644                                 check_sa = NULL;
2645                         break;
2646                 case NL80211_IFTYPE_MESH_POINT:
2647                         check_sa = NULL;
2648                         break;
2649                 default:
2650                         break;
2651         }
2652
2653         skb->dev = dev;
2654         __skb_queue_head_init(&frame_list);
2655
2656         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2657                                           rx->sdata->vif.addr,
2658                                           rx->sdata->vif.type,
2659                                           data_offset))
2660                 return RX_DROP_UNUSABLE;
2661
2662         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2663                                  rx->sdata->vif.type,
2664                                  rx->local->hw.extra_tx_headroom,
2665                                  check_da, check_sa);
2666
2667         while (!skb_queue_empty(&frame_list)) {
2668                 rx->skb = __skb_dequeue(&frame_list);
2669
2670                 if (!ieee80211_frame_allowed(rx, fc)) {
2671                         dev_kfree_skb(rx->skb);
2672                         continue;
2673                 }
2674
2675                 ieee80211_deliver_skb(rx);
2676         }
2677
2678         return RX_QUEUED;
2679 }
2680
2681 static ieee80211_rx_result debug_noinline
2682 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2683 {
2684         struct sk_buff *skb = rx->skb;
2685         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2686         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2687         __le16 fc = hdr->frame_control;
2688
2689         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2690                 return RX_CONTINUE;
2691
2692         if (unlikely(!ieee80211_is_data(fc)))
2693                 return RX_CONTINUE;
2694
2695         if (unlikely(!ieee80211_is_data_present(fc)))
2696                 return RX_DROP_MONITOR;
2697
2698         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2699                 switch (rx->sdata->vif.type) {
2700                 case NL80211_IFTYPE_AP_VLAN:
2701                         if (!rx->sdata->u.vlan.sta)
2702                                 return RX_DROP_UNUSABLE;
2703                         break;
2704                 case NL80211_IFTYPE_STATION:
2705                         if (!rx->sdata->u.mgd.use_4addr)
2706                                 return RX_DROP_UNUSABLE;
2707                         break;
2708                 default:
2709                         return RX_DROP_UNUSABLE;
2710                 }
2711         }
2712
2713         if (is_multicast_ether_addr(hdr->addr1))
2714                 return RX_DROP_UNUSABLE;
2715
2716         return __ieee80211_rx_h_amsdu(rx, 0);
2717 }
2718
2719 #ifdef CONFIG_MAC80211_MESH
2720 static ieee80211_rx_result
2721 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2722 {
2723         struct ieee80211_hdr *fwd_hdr, *hdr;
2724         struct ieee80211_tx_info *info;
2725         struct ieee80211s_hdr *mesh_hdr;
2726         struct sk_buff *skb = rx->skb, *fwd_skb;
2727         struct ieee80211_local *local = rx->local;
2728         struct ieee80211_sub_if_data *sdata = rx->sdata;
2729         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2730         u16 ac, q, hdrlen;
2731         int tailroom = 0;
2732
2733         hdr = (struct ieee80211_hdr *) skb->data;
2734         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2735
2736         /* make sure fixed part of mesh header is there, also checks skb len */
2737         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2738                 return RX_DROP_MONITOR;
2739
2740         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2741
2742         /* make sure full mesh header is there, also checks skb len */
2743         if (!pskb_may_pull(rx->skb,
2744                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2745                 return RX_DROP_MONITOR;
2746
2747         /* reload pointers */
2748         hdr = (struct ieee80211_hdr *) skb->data;
2749         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2750
2751         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2752                 return RX_DROP_MONITOR;
2753
2754         /* frame is in RMC, don't forward */
2755         if (ieee80211_is_data(hdr->frame_control) &&
2756             is_multicast_ether_addr(hdr->addr1) &&
2757             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2758                 return RX_DROP_MONITOR;
2759
2760         if (!ieee80211_is_data(hdr->frame_control))
2761                 return RX_CONTINUE;
2762
2763         if (!mesh_hdr->ttl)
2764                 return RX_DROP_MONITOR;
2765
2766         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2767                 struct mesh_path *mppath;
2768                 char *proxied_addr;
2769                 char *mpp_addr;
2770
2771                 if (is_multicast_ether_addr(hdr->addr1)) {
2772                         mpp_addr = hdr->addr3;
2773                         proxied_addr = mesh_hdr->eaddr1;
2774                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2775                             MESH_FLAGS_AE_A5_A6) {
2776                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2777                         mpp_addr = hdr->addr4;
2778                         proxied_addr = mesh_hdr->eaddr2;
2779                 } else {
2780                         return RX_DROP_MONITOR;
2781                 }
2782
2783                 rcu_read_lock();
2784                 mppath = mpp_path_lookup(sdata, proxied_addr);
2785                 if (!mppath) {
2786                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2787                 } else {
2788                         spin_lock_bh(&mppath->state_lock);
2789                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2790                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2791                         mppath->exp_time = jiffies;
2792                         spin_unlock_bh(&mppath->state_lock);
2793                 }
2794                 rcu_read_unlock();
2795         }
2796
2797         /* Frame has reached destination.  Don't forward */
2798         if (!is_multicast_ether_addr(hdr->addr1) &&
2799             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2800                 return RX_CONTINUE;
2801
2802         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2803         q = sdata->vif.hw_queue[ac];
2804         if (ieee80211_queue_stopped(&local->hw, q)) {
2805                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2806                 return RX_DROP_MONITOR;
2807         }
2808         skb_set_queue_mapping(skb, q);
2809
2810         if (!--mesh_hdr->ttl) {
2811                 if (!is_multicast_ether_addr(hdr->addr1))
2812                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2813                                                      dropped_frames_ttl);
2814                 goto out;
2815         }
2816
2817         if (!ifmsh->mshcfg.dot11MeshForwarding)
2818                 goto out;
2819
2820         if (sdata->crypto_tx_tailroom_needed_cnt)
2821                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2822
2823         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2824                                        sdata->encrypt_headroom,
2825                                   tailroom, GFP_ATOMIC);
2826         if (!fwd_skb)
2827                 goto out;
2828
2829         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2830         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2831         info = IEEE80211_SKB_CB(fwd_skb);
2832         memset(info, 0, sizeof(*info));
2833         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2834         info->control.vif = &rx->sdata->vif;
2835         info->control.jiffies = jiffies;
2836         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2837                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2838                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2839                 /* update power mode indication when forwarding */
2840                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2841         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2842                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2843                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2844         } else {
2845                 /* unable to resolve next hop */
2846                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2847                                    fwd_hdr->addr3, 0,
2848                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2849                                    fwd_hdr->addr2);
2850                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2851                 kfree_skb(fwd_skb);
2852                 return RX_DROP_MONITOR;
2853         }
2854
2855         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2856         ieee80211_add_pending_skb(local, fwd_skb);
2857  out:
2858         if (is_multicast_ether_addr(hdr->addr1))
2859                 return RX_CONTINUE;
2860         return RX_DROP_MONITOR;
2861 }
2862 #endif
2863
2864 static ieee80211_rx_result debug_noinline
2865 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2866 {
2867         struct ieee80211_sub_if_data *sdata = rx->sdata;
2868         struct ieee80211_local *local = rx->local;
2869         struct net_device *dev = sdata->dev;
2870         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2871         __le16 fc = hdr->frame_control;
2872         bool port_control;
2873         int err;
2874
2875         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2876                 return RX_CONTINUE;
2877
2878         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2879                 return RX_DROP_MONITOR;
2880
2881         /*
2882          * Send unexpected-4addr-frame event to hostapd. For older versions,
2883          * also drop the frame to cooked monitor interfaces.
2884          */
2885         if (ieee80211_has_a4(hdr->frame_control) &&
2886             sdata->vif.type == NL80211_IFTYPE_AP) {
2887                 if (rx->sta &&
2888                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2889                         cfg80211_rx_unexpected_4addr_frame(
2890                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2891                 return RX_DROP_MONITOR;
2892         }
2893
2894         err = __ieee80211_data_to_8023(rx, &port_control);
2895         if (unlikely(err))
2896                 return RX_DROP_UNUSABLE;
2897
2898         if (!ieee80211_frame_allowed(rx, fc))
2899                 return RX_DROP_MONITOR;
2900
2901         /* directly handle TDLS channel switch requests/responses */
2902         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2903                                                 cpu_to_be16(ETH_P_TDLS))) {
2904                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2905
2906                 if (pskb_may_pull(rx->skb,
2907                                   offsetof(struct ieee80211_tdls_data, u)) &&
2908                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2909                     tf->category == WLAN_CATEGORY_TDLS &&
2910                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2911                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2912                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2913                         schedule_work(&local->tdls_chsw_work);
2914                         if (rx->sta)
2915                                 rx->sta->rx_stats.packets++;
2916
2917                         return RX_QUEUED;
2918                 }
2919         }
2920
2921         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2922             unlikely(port_control) && sdata->bss) {
2923                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2924                                      u.ap);
2925                 dev = sdata->dev;
2926                 rx->sdata = sdata;
2927         }
2928
2929         rx->skb->dev = dev;
2930
2931         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2932             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2933             !is_multicast_ether_addr(
2934                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2935             (!local->scanning &&
2936              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2937                 mod_timer(&local->dynamic_ps_timer, jiffies +
2938                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2939
2940         ieee80211_deliver_skb(rx);
2941
2942         return RX_QUEUED;
2943 }
2944
2945 static ieee80211_rx_result debug_noinline
2946 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2947 {
2948         struct sk_buff *skb = rx->skb;
2949         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2950         struct tid_ampdu_rx *tid_agg_rx;
2951         u16 start_seq_num;
2952         u16 tid;
2953
2954         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2955                 return RX_CONTINUE;
2956
2957         if (ieee80211_is_back_req(bar->frame_control)) {
2958                 struct {
2959                         __le16 control, start_seq_num;
2960                 } __packed bar_data;
2961                 struct ieee80211_event event = {
2962                         .type = BAR_RX_EVENT,
2963                 };
2964
2965                 if (!rx->sta)
2966                         return RX_DROP_MONITOR;
2967
2968                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2969                                   &bar_data, sizeof(bar_data)))
2970                         return RX_DROP_MONITOR;
2971
2972                 tid = le16_to_cpu(bar_data.control) >> 12;
2973
2974                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2975                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2976                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2977                                              WLAN_BACK_RECIPIENT,
2978                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2979
2980                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2981                 if (!tid_agg_rx)
2982                         return RX_DROP_MONITOR;
2983
2984                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2985                 event.u.ba.tid = tid;
2986                 event.u.ba.ssn = start_seq_num;
2987                 event.u.ba.sta = &rx->sta->sta;
2988
2989                 /* reset session timer */
2990                 if (tid_agg_rx->timeout)
2991                         mod_timer(&tid_agg_rx->session_timer,
2992                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2993
2994                 spin_lock(&tid_agg_rx->reorder_lock);
2995                 /* release stored frames up to start of BAR */
2996                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2997                                                  start_seq_num, frames);
2998                 spin_unlock(&tid_agg_rx->reorder_lock);
2999
3000                 drv_event_callback(rx->local, rx->sdata, &event);
3001
3002                 kfree_skb(skb);
3003                 return RX_QUEUED;
3004         }
3005
3006         /*
3007          * After this point, we only want management frames,
3008          * so we can drop all remaining control frames to
3009          * cooked monitor interfaces.
3010          */
3011         return RX_DROP_MONITOR;
3012 }
3013
3014 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3015                                            struct ieee80211_mgmt *mgmt,
3016                                            size_t len)
3017 {
3018         struct ieee80211_local *local = sdata->local;
3019         struct sk_buff *skb;
3020         struct ieee80211_mgmt *resp;
3021
3022         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3023                 /* Not to own unicast address */
3024                 return;
3025         }
3026
3027         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3028             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3029                 /* Not from the current AP or not associated yet. */
3030                 return;
3031         }
3032
3033         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3034                 /* Too short SA Query request frame */
3035                 return;
3036         }
3037
3038         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3039         if (skb == NULL)
3040                 return;
3041
3042         skb_reserve(skb, local->hw.extra_tx_headroom);
3043         resp = skb_put_zero(skb, 24);
3044         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3045         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3046         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3047         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3048                                           IEEE80211_STYPE_ACTION);
3049         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3050         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3051         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3052         memcpy(resp->u.action.u.sa_query.trans_id,
3053                mgmt->u.action.u.sa_query.trans_id,
3054                WLAN_SA_QUERY_TR_ID_LEN);
3055
3056         ieee80211_tx_skb(sdata, skb);
3057 }
3058
3059 static ieee80211_rx_result debug_noinline
3060 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3061 {
3062         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3063         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3064
3065         /*
3066          * From here on, look only at management frames.
3067          * Data and control frames are already handled,
3068          * and unknown (reserved) frames are useless.
3069          */
3070         if (rx->skb->len < 24)
3071                 return RX_DROP_MONITOR;
3072
3073         if (!ieee80211_is_mgmt(mgmt->frame_control))
3074                 return RX_DROP_MONITOR;
3075
3076         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3077             ieee80211_is_beacon(mgmt->frame_control) &&
3078             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3079                 int sig = 0;
3080
3081                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3082                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3083                         sig = status->signal;
3084
3085                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3086                                             rx->skb->data, rx->skb->len,
3087                                             status->freq, sig);
3088                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3089         }
3090
3091         if (ieee80211_drop_unencrypted_mgmt(rx))
3092                 return RX_DROP_UNUSABLE;
3093
3094         return RX_CONTINUE;
3095 }
3096
3097 static ieee80211_rx_result debug_noinline
3098 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3099 {
3100         struct ieee80211_local *local = rx->local;
3101         struct ieee80211_sub_if_data *sdata = rx->sdata;
3102         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3103         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3104         int len = rx->skb->len;
3105
3106         if (!ieee80211_is_action(mgmt->frame_control))
3107                 return RX_CONTINUE;
3108
3109         /* drop too small frames */
3110         if (len < IEEE80211_MIN_ACTION_SIZE)
3111                 return RX_DROP_UNUSABLE;
3112
3113         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3114             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3115             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3116                 return RX_DROP_UNUSABLE;
3117
3118         switch (mgmt->u.action.category) {
3119         case WLAN_CATEGORY_HT:
3120                 /* reject HT action frames from stations not supporting HT */
3121                 if (!rx->sta->sta.ht_cap.ht_supported)
3122                         goto invalid;
3123
3124                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3125                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3126                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3127                     sdata->vif.type != NL80211_IFTYPE_AP &&
3128                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3129                         break;
3130
3131                 /* verify action & smps_control/chanwidth are present */
3132                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3133                         goto invalid;
3134
3135                 switch (mgmt->u.action.u.ht_smps.action) {
3136                 case WLAN_HT_ACTION_SMPS: {
3137                         struct ieee80211_supported_band *sband;
3138                         enum ieee80211_smps_mode smps_mode;
3139                         struct sta_opmode_info sta_opmode = {};
3140
3141                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3142                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3143                                 goto handled;
3144
3145                         /* convert to HT capability */
3146                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3147                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3148                                 smps_mode = IEEE80211_SMPS_OFF;
3149                                 break;
3150                         case WLAN_HT_SMPS_CONTROL_STATIC:
3151                                 smps_mode = IEEE80211_SMPS_STATIC;
3152                                 break;
3153                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3154                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3155                                 break;
3156                         default:
3157                                 goto invalid;
3158                         }
3159
3160                         /* if no change do nothing */
3161                         if (rx->sta->sta.smps_mode == smps_mode)
3162                                 goto handled;
3163                         rx->sta->sta.smps_mode = smps_mode;
3164                         sta_opmode.smps_mode =
3165                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3166                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3167
3168                         sband = rx->local->hw.wiphy->bands[status->band];
3169
3170                         rate_control_rate_update(local, sband, rx->sta,
3171                                                  IEEE80211_RC_SMPS_CHANGED);
3172                         cfg80211_sta_opmode_change_notify(sdata->dev,
3173                                                           rx->sta->addr,
3174                                                           &sta_opmode,
3175                                                           GFP_ATOMIC);
3176                         goto handled;
3177                 }
3178                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3179                         struct ieee80211_supported_band *sband;
3180                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3181                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3182                         struct sta_opmode_info sta_opmode = {};
3183
3184                         /* If it doesn't support 40 MHz it can't change ... */
3185                         if (!(rx->sta->sta.ht_cap.cap &
3186                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3187                                 goto handled;
3188
3189                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3190                                 max_bw = IEEE80211_STA_RX_BW_20;
3191                         else
3192                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3193
3194                         /* set cur_max_bandwidth and recalc sta bw */
3195                         rx->sta->cur_max_bandwidth = max_bw;
3196                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3197
3198                         if (rx->sta->sta.bandwidth == new_bw)
3199                                 goto handled;
3200
3201                         rx->sta->sta.bandwidth = new_bw;
3202                         sband = rx->local->hw.wiphy->bands[status->band];
3203                         sta_opmode.bw =
3204                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3205                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3206
3207                         rate_control_rate_update(local, sband, rx->sta,
3208                                                  IEEE80211_RC_BW_CHANGED);
3209                         cfg80211_sta_opmode_change_notify(sdata->dev,
3210                                                           rx->sta->addr,
3211                                                           &sta_opmode,
3212                                                           GFP_ATOMIC);
3213                         goto handled;
3214                 }
3215                 default:
3216                         goto invalid;
3217                 }
3218
3219                 break;
3220         case WLAN_CATEGORY_PUBLIC:
3221                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3222                         goto invalid;
3223                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3224                         break;
3225                 if (!rx->sta)
3226                         break;
3227                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3228                         break;
3229                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3230                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3231                         break;
3232                 if (len < offsetof(struct ieee80211_mgmt,
3233                                    u.action.u.ext_chan_switch.variable))
3234                         goto invalid;
3235                 goto queue;
3236         case WLAN_CATEGORY_VHT:
3237                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3238                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3239                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3240                     sdata->vif.type != NL80211_IFTYPE_AP &&
3241                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3242                         break;
3243
3244                 /* verify action code is present */
3245                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3246                         goto invalid;
3247
3248                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3249                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3250                         /* verify opmode is present */
3251                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3252                                 goto invalid;
3253                         goto queue;
3254                 }
3255                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3256                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3257                                 goto invalid;
3258                         goto queue;
3259                 }
3260                 default:
3261                         break;
3262                 }
3263                 break;
3264         case WLAN_CATEGORY_BACK:
3265                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3266                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3267                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3268                     sdata->vif.type != NL80211_IFTYPE_AP &&
3269                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3270                         break;
3271
3272                 /* verify action_code is present */
3273                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3274                         break;
3275
3276                 switch (mgmt->u.action.u.addba_req.action_code) {
3277                 case WLAN_ACTION_ADDBA_REQ:
3278                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3279                                    sizeof(mgmt->u.action.u.addba_req)))
3280                                 goto invalid;
3281                         break;
3282                 case WLAN_ACTION_ADDBA_RESP:
3283                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3284                                    sizeof(mgmt->u.action.u.addba_resp)))
3285                                 goto invalid;
3286                         break;
3287                 case WLAN_ACTION_DELBA:
3288                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3289                                    sizeof(mgmt->u.action.u.delba)))
3290                                 goto invalid;
3291                         break;
3292                 default:
3293                         goto invalid;
3294                 }
3295
3296                 goto queue;
3297         case WLAN_CATEGORY_SPECTRUM_MGMT:
3298                 /* verify action_code is present */
3299                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3300                         break;
3301
3302                 switch (mgmt->u.action.u.measurement.action_code) {
3303                 case WLAN_ACTION_SPCT_MSR_REQ:
3304                         if (status->band != NL80211_BAND_5GHZ)
3305                                 break;
3306
3307                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3308                                    sizeof(mgmt->u.action.u.measurement)))
3309                                 break;
3310
3311                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3312                                 break;
3313
3314                         ieee80211_process_measurement_req(sdata, mgmt, len);
3315                         goto handled;
3316                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3317                         u8 *bssid;
3318                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3319                                    sizeof(mgmt->u.action.u.chan_switch)))
3320                                 break;
3321
3322                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3323                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3324                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3325                                 break;
3326
3327                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3328                                 bssid = sdata->u.mgd.bssid;
3329                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3330                                 bssid = sdata->u.ibss.bssid;
3331                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3332                                 bssid = mgmt->sa;
3333                         else
3334                                 break;
3335
3336                         if (!ether_addr_equal(mgmt->bssid, bssid))
3337                                 break;
3338
3339                         goto queue;
3340                         }
3341                 }
3342                 break;
3343         case WLAN_CATEGORY_SA_QUERY:
3344                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3345                            sizeof(mgmt->u.action.u.sa_query)))
3346                         break;
3347
3348                 switch (mgmt->u.action.u.sa_query.action) {
3349                 case WLAN_ACTION_SA_QUERY_REQUEST:
3350                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3351                                 break;
3352                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3353                         goto handled;
3354                 }
3355                 break;
3356         case WLAN_CATEGORY_SELF_PROTECTED:
3357                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3358                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3359                         break;
3360
3361                 switch (mgmt->u.action.u.self_prot.action_code) {
3362                 case WLAN_SP_MESH_PEERING_OPEN:
3363                 case WLAN_SP_MESH_PEERING_CLOSE:
3364                 case WLAN_SP_MESH_PEERING_CONFIRM:
3365                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3366                                 goto invalid;
3367                         if (sdata->u.mesh.user_mpm)
3368                                 /* userspace handles this frame */
3369                                 break;
3370                         goto queue;
3371                 case WLAN_SP_MGK_INFORM:
3372                 case WLAN_SP_MGK_ACK:
3373                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3374                                 goto invalid;
3375                         break;
3376                 }
3377                 break;
3378         case WLAN_CATEGORY_MESH_ACTION:
3379                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3380                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3381                         break;
3382
3383                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3384                         break;
3385                 if (mesh_action_is_path_sel(mgmt) &&
3386                     !mesh_path_sel_is_hwmp(sdata))
3387                         break;
3388                 goto queue;
3389         }
3390
3391         return RX_CONTINUE;
3392
3393  invalid:
3394         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3395         /* will return in the next handlers */
3396         return RX_CONTINUE;
3397
3398  handled:
3399         if (rx->sta)
3400                 rx->sta->rx_stats.packets++;
3401         dev_kfree_skb(rx->skb);
3402         return RX_QUEUED;
3403
3404  queue:
3405         skb_queue_tail(&sdata->skb_queue, rx->skb);
3406         ieee80211_queue_work(&local->hw, &sdata->work);
3407         if (rx->sta)
3408                 rx->sta->rx_stats.packets++;
3409         return RX_QUEUED;
3410 }
3411
3412 static ieee80211_rx_result debug_noinline
3413 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3414 {
3415         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3416         int sig = 0;
3417
3418         /* skip known-bad action frames and return them in the next handler */
3419         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3420                 return RX_CONTINUE;
3421
3422         /*
3423          * Getting here means the kernel doesn't know how to handle
3424          * it, but maybe userspace does ... include returned frames
3425          * so userspace can register for those to know whether ones
3426          * it transmitted were processed or returned.
3427          */
3428
3429         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3430             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3431                 sig = status->signal;
3432
3433         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3434                              rx->skb->data, rx->skb->len, 0)) {
3435                 if (rx->sta)
3436                         rx->sta->rx_stats.packets++;
3437                 dev_kfree_skb(rx->skb);
3438                 return RX_QUEUED;
3439         }
3440
3441         return RX_CONTINUE;
3442 }
3443
3444 static ieee80211_rx_result debug_noinline
3445 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3446 {
3447         struct ieee80211_local *local = rx->local;
3448         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3449         struct sk_buff *nskb;
3450         struct ieee80211_sub_if_data *sdata = rx->sdata;
3451         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3452
3453         if (!ieee80211_is_action(mgmt->frame_control))
3454                 return RX_CONTINUE;
3455
3456         /*
3457          * For AP mode, hostapd is responsible for handling any action
3458          * frames that we didn't handle, including returning unknown
3459          * ones. For all other modes we will return them to the sender,
3460          * setting the 0x80 bit in the action category, as required by
3461          * 802.11-2012 9.24.4.
3462          * Newer versions of hostapd shall also use the management frame
3463          * registration mechanisms, but older ones still use cooked
3464          * monitor interfaces so push all frames there.
3465          */
3466         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3467             (sdata->vif.type == NL80211_IFTYPE_AP ||
3468              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3469                 return RX_DROP_MONITOR;
3470
3471         if (is_multicast_ether_addr(mgmt->da))
3472                 return RX_DROP_MONITOR;
3473
3474         /* do not return rejected action frames */
3475         if (mgmt->u.action.category & 0x80)
3476                 return RX_DROP_UNUSABLE;
3477
3478         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3479                                GFP_ATOMIC);
3480         if (nskb) {
3481                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3482
3483                 nmgmt->u.action.category |= 0x80;
3484                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3485                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3486
3487                 memset(nskb->cb, 0, sizeof(nskb->cb));
3488
3489                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3490                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3491
3492                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3493                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3494                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3495                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3496                                 info->hw_queue =
3497                                         local->hw.offchannel_tx_hw_queue;
3498                 }
3499
3500                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3501                                             status->band, 0);
3502         }
3503         dev_kfree_skb(rx->skb);
3504         return RX_QUEUED;
3505 }
3506
3507 static ieee80211_rx_result debug_noinline
3508 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3509 {
3510         struct ieee80211_sub_if_data *sdata = rx->sdata;
3511         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3512         __le16 stype;
3513
3514         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3515
3516         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3517             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3518             sdata->vif.type != NL80211_IFTYPE_OCB &&
3519             sdata->vif.type != NL80211_IFTYPE_STATION)
3520                 return RX_DROP_MONITOR;
3521
3522         switch (stype) {
3523         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3524         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3525         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3526                 /* process for all: mesh, mlme, ibss */
3527                 break;
3528         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3529                 if (is_multicast_ether_addr(mgmt->da) &&
3530                     !is_broadcast_ether_addr(mgmt->da))
3531                         return RX_DROP_MONITOR;
3532
3533                 /* process only for station/IBSS */
3534                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3535                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3536                         return RX_DROP_MONITOR;
3537                 break;
3538         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3539         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3540         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3541                 if (is_multicast_ether_addr(mgmt->da) &&
3542                     !is_broadcast_ether_addr(mgmt->da))
3543                         return RX_DROP_MONITOR;
3544
3545                 /* process only for station */
3546                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3547                         return RX_DROP_MONITOR;
3548                 break;
3549         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3550                 /* process only for ibss and mesh */
3551                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3552                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3553                         return RX_DROP_MONITOR;
3554                 break;
3555         default:
3556                 return RX_DROP_MONITOR;
3557         }
3558
3559         /* queue up frame and kick off work to process it */
3560         skb_queue_tail(&sdata->skb_queue, rx->skb);
3561         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3562         if (rx->sta)
3563                 rx->sta->rx_stats.packets++;
3564
3565         return RX_QUEUED;
3566 }
3567
3568 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3569                                         struct ieee80211_rate *rate)
3570 {
3571         struct ieee80211_sub_if_data *sdata;
3572         struct ieee80211_local *local = rx->local;
3573         struct sk_buff *skb = rx->skb, *skb2;
3574         struct net_device *prev_dev = NULL;
3575         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3576         int needed_headroom;
3577
3578         /*
3579          * If cooked monitor has been processed already, then
3580          * don't do it again. If not, set the flag.
3581          */
3582         if (rx->flags & IEEE80211_RX_CMNTR)
3583                 goto out_free_skb;
3584         rx->flags |= IEEE80211_RX_CMNTR;
3585
3586         /* If there are no cooked monitor interfaces, just free the SKB */
3587         if (!local->cooked_mntrs)
3588                 goto out_free_skb;
3589
3590         /* vendor data is long removed here */
3591         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3592         /* room for the radiotap header based on driver features */
3593         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3594
3595         if (skb_headroom(skb) < needed_headroom &&
3596             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3597                 goto out_free_skb;
3598
3599         /* prepend radiotap information */
3600         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3601                                          false);
3602
3603         skb_reset_mac_header(skb);
3604         skb->ip_summed = CHECKSUM_UNNECESSARY;
3605         skb->pkt_type = PACKET_OTHERHOST;
3606         skb->protocol = htons(ETH_P_802_2);
3607
3608         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3609                 if (!ieee80211_sdata_running(sdata))
3610                         continue;
3611
3612                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3613                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3614                         continue;
3615
3616                 if (prev_dev) {
3617                         skb2 = skb_clone(skb, GFP_ATOMIC);
3618                         if (skb2) {
3619                                 skb2->dev = prev_dev;
3620                                 netif_receive_skb(skb2);
3621                         }
3622                 }
3623
3624                 prev_dev = sdata->dev;
3625                 ieee80211_rx_stats(sdata->dev, skb->len);
3626         }
3627
3628         if (prev_dev) {
3629                 skb->dev = prev_dev;
3630                 netif_receive_skb(skb);
3631                 return;
3632         }
3633
3634  out_free_skb:
3635         dev_kfree_skb(skb);
3636 }
3637
3638 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3639                                          ieee80211_rx_result res)
3640 {
3641         switch (res) {
3642         case RX_DROP_MONITOR:
3643                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3644                 if (rx->sta)
3645                         rx->sta->rx_stats.dropped++;
3646                 /* fall through */
3647         case RX_CONTINUE: {
3648                 struct ieee80211_rate *rate = NULL;
3649                 struct ieee80211_supported_band *sband;
3650                 struct ieee80211_rx_status *status;
3651
3652                 status = IEEE80211_SKB_RXCB((rx->skb));
3653
3654                 sband = rx->local->hw.wiphy->bands[status->band];
3655                 if (status->encoding == RX_ENC_LEGACY)
3656                         rate = &sband->bitrates[status->rate_idx];
3657
3658                 ieee80211_rx_cooked_monitor(rx, rate);
3659                 break;
3660                 }
3661         case RX_DROP_UNUSABLE:
3662                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3663                 if (rx->sta)
3664                         rx->sta->rx_stats.dropped++;
3665                 dev_kfree_skb(rx->skb);
3666                 break;
3667         case RX_QUEUED:
3668                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3669                 break;
3670         }
3671 }
3672
3673 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3674                                   struct sk_buff_head *frames)
3675 {
3676         ieee80211_rx_result res = RX_DROP_MONITOR;
3677         struct sk_buff *skb;
3678
3679 #define CALL_RXH(rxh)                   \
3680         do {                            \
3681                 res = rxh(rx);          \
3682                 if (res != RX_CONTINUE) \
3683                         goto rxh_next;  \
3684         } while (0)
3685
3686         /* Lock here to avoid hitting all of the data used in the RX
3687          * path (e.g. key data, station data, ...) concurrently when
3688          * a frame is released from the reorder buffer due to timeout
3689          * from the timer, potentially concurrently with RX from the
3690          * driver.
3691          */
3692         spin_lock_bh(&rx->local->rx_path_lock);
3693
3694         while ((skb = __skb_dequeue(frames))) {
3695                 /*
3696                  * all the other fields are valid across frames
3697                  * that belong to an aMPDU since they are on the
3698                  * same TID from the same station
3699                  */
3700                 rx->skb = skb;
3701
3702                 CALL_RXH(ieee80211_rx_h_check_more_data);
3703                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3704                 CALL_RXH(ieee80211_rx_h_sta_process);
3705                 CALL_RXH(ieee80211_rx_h_decrypt);
3706                 CALL_RXH(ieee80211_rx_h_defragment);
3707                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3708                 /* must be after MMIC verify so header is counted in MPDU mic */
3709 #ifdef CONFIG_MAC80211_MESH
3710                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3711                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3712 #endif
3713                 CALL_RXH(ieee80211_rx_h_amsdu);
3714                 CALL_RXH(ieee80211_rx_h_data);
3715
3716                 /* special treatment -- needs the queue */
3717                 res = ieee80211_rx_h_ctrl(rx, frames);
3718                 if (res != RX_CONTINUE)
3719                         goto rxh_next;
3720
3721                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3722                 CALL_RXH(ieee80211_rx_h_action);
3723                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3724                 CALL_RXH(ieee80211_rx_h_action_return);
3725                 CALL_RXH(ieee80211_rx_h_mgmt);
3726
3727  rxh_next:
3728                 ieee80211_rx_handlers_result(rx, res);
3729
3730 #undef CALL_RXH
3731         }
3732
3733         spin_unlock_bh(&rx->local->rx_path_lock);
3734 }
3735
3736 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3737 {
3738         struct sk_buff_head reorder_release;
3739         ieee80211_rx_result res = RX_DROP_MONITOR;
3740
3741         __skb_queue_head_init(&reorder_release);
3742
3743 #define CALL_RXH(rxh)                   \
3744         do {                            \
3745                 res = rxh(rx);          \
3746                 if (res != RX_CONTINUE) \
3747                         goto rxh_next;  \
3748         } while (0)
3749
3750         CALL_RXH(ieee80211_rx_h_check_dup);
3751         CALL_RXH(ieee80211_rx_h_check);
3752
3753         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3754
3755         ieee80211_rx_handlers(rx, &reorder_release);
3756         return;
3757
3758  rxh_next:
3759         ieee80211_rx_handlers_result(rx, res);
3760
3761 #undef CALL_RXH
3762 }
3763
3764 /*
3765  * This function makes calls into the RX path, therefore
3766  * it has to be invoked under RCU read lock.
3767  */
3768 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3769 {
3770         struct sk_buff_head frames;
3771         struct ieee80211_rx_data rx = {
3772                 .sta = sta,
3773                 .sdata = sta->sdata,
3774                 .local = sta->local,
3775                 /* This is OK -- must be QoS data frame */
3776                 .security_idx = tid,
3777                 .seqno_idx = tid,
3778                 .napi = NULL, /* must be NULL to not have races */
3779         };
3780         struct tid_ampdu_rx *tid_agg_rx;
3781
3782         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3783         if (!tid_agg_rx)
3784                 return;
3785
3786         __skb_queue_head_init(&frames);
3787
3788         spin_lock(&tid_agg_rx->reorder_lock);
3789         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3790         spin_unlock(&tid_agg_rx->reorder_lock);
3791
3792         if (!skb_queue_empty(&frames)) {
3793                 struct ieee80211_event event = {
3794                         .type = BA_FRAME_TIMEOUT,
3795                         .u.ba.tid = tid,
3796                         .u.ba.sta = &sta->sta,
3797                 };
3798                 drv_event_callback(rx.local, rx.sdata, &event);
3799         }
3800
3801         ieee80211_rx_handlers(&rx, &frames);
3802 }
3803
3804 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3805                                           u16 ssn, u64 filtered,
3806                                           u16 received_mpdus)
3807 {
3808         struct sta_info *sta;
3809         struct tid_ampdu_rx *tid_agg_rx;
3810         struct sk_buff_head frames;
3811         struct ieee80211_rx_data rx = {
3812                 /* This is OK -- must be QoS data frame */
3813                 .security_idx = tid,
3814                 .seqno_idx = tid,
3815         };
3816         int i, diff;
3817
3818         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3819                 return;
3820
3821         __skb_queue_head_init(&frames);
3822
3823         sta = container_of(pubsta, struct sta_info, sta);
3824
3825         rx.sta = sta;
3826         rx.sdata = sta->sdata;
3827         rx.local = sta->local;
3828
3829         rcu_read_lock();
3830         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3831         if (!tid_agg_rx)
3832                 goto out;
3833
3834         spin_lock_bh(&tid_agg_rx->reorder_lock);
3835
3836         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3837                 int release;
3838
3839                 /* release all frames in the reorder buffer */
3840                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3841                            IEEE80211_SN_MODULO;
3842                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3843                                                  release, &frames);
3844                 /* update ssn to match received ssn */
3845                 tid_agg_rx->head_seq_num = ssn;
3846         } else {
3847                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3848                                                  &frames);
3849         }
3850
3851         /* handle the case that received ssn is behind the mac ssn.
3852          * it can be tid_agg_rx->buf_size behind and still be valid */
3853         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3854         if (diff >= tid_agg_rx->buf_size) {
3855                 tid_agg_rx->reorder_buf_filtered = 0;
3856                 goto release;
3857         }
3858         filtered = filtered >> diff;
3859         ssn += diff;
3860
3861         /* update bitmap */
3862         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3863                 int index = (ssn + i) % tid_agg_rx->buf_size;
3864
3865                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3866                 if (filtered & BIT_ULL(i))
3867                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3868         }
3869
3870         /* now process also frames that the filter marking released */
3871         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3872
3873 release:
3874         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3875
3876         ieee80211_rx_handlers(&rx, &frames);
3877
3878  out:
3879         rcu_read_unlock();
3880 }
3881 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3882
3883 /* main receive path */
3884
3885 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3886 {
3887         struct ieee80211_sub_if_data *sdata = rx->sdata;
3888         struct sk_buff *skb = rx->skb;
3889         struct ieee80211_hdr *hdr = (void *)skb->data;
3890         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3891         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3892         bool multicast = is_multicast_ether_addr(hdr->addr1);
3893
3894         switch (sdata->vif.type) {
3895         case NL80211_IFTYPE_STATION:
3896                 if (!bssid && !sdata->u.mgd.use_4addr)
3897                         return false;
3898                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3899                         return false;
3900                 if (multicast)
3901                         return true;
3902                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3903         case NL80211_IFTYPE_ADHOC:
3904                 if (!bssid)
3905                         return false;
3906                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3907                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3908                         return false;
3909                 if (ieee80211_is_beacon(hdr->frame_control))
3910                         return true;
3911                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3912                         return false;
3913                 if (!multicast &&
3914                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3915                         return false;
3916                 if (!rx->sta) {
3917                         int rate_idx;
3918                         if (status->encoding != RX_ENC_LEGACY)
3919                                 rate_idx = 0; /* TODO: HT/VHT rates */
3920                         else
3921                                 rate_idx = status->rate_idx;
3922                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3923                                                  BIT(rate_idx));
3924                 }
3925                 return true;
3926         case NL80211_IFTYPE_OCB:
3927                 if (!bssid)
3928                         return false;
3929                 if (!ieee80211_is_data_present(hdr->frame_control))
3930                         return false;
3931                 if (!is_broadcast_ether_addr(bssid))
3932                         return false;
3933                 if (!multicast &&
3934                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3935                         return false;
3936                 if (!rx->sta) {
3937                         int rate_idx;
3938                         if (status->encoding != RX_ENC_LEGACY)
3939                                 rate_idx = 0; /* TODO: HT rates */
3940                         else
3941                                 rate_idx = status->rate_idx;
3942                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3943                                                 BIT(rate_idx));
3944                 }
3945                 return true;
3946         case NL80211_IFTYPE_MESH_POINT:
3947                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3948                         return false;
3949                 if (multicast)
3950                         return true;
3951                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3952         case NL80211_IFTYPE_AP_VLAN:
3953         case NL80211_IFTYPE_AP:
3954                 if (!bssid)
3955                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3956
3957                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3958                         /*
3959                          * Accept public action frames even when the
3960                          * BSSID doesn't match, this is used for P2P
3961                          * and location updates. Note that mac80211
3962                          * itself never looks at these frames.
3963                          */
3964                         if (!multicast &&
3965                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3966                                 return false;
3967                         if (ieee80211_is_public_action(hdr, skb->len))
3968                                 return true;
3969                         return ieee80211_is_beacon(hdr->frame_control);
3970                 }
3971
3972                 if (!ieee80211_has_tods(hdr->frame_control)) {
3973                         /* ignore data frames to TDLS-peers */
3974                         if (ieee80211_is_data(hdr->frame_control))
3975                                 return false;
3976                         /* ignore action frames to TDLS-peers */
3977                         if (ieee80211_is_action(hdr->frame_control) &&
3978                             !is_broadcast_ether_addr(bssid) &&
3979                             !ether_addr_equal(bssid, hdr->addr1))
3980                                 return false;
3981                 }
3982
3983                 /*
3984                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3985                  * the BSSID - we've checked that already but may have accepted
3986                  * the wildcard (ff:ff:ff:ff:ff:ff).
3987                  *
3988                  * It also says:
3989                  *      The BSSID of the Data frame is determined as follows:
3990                  *      a) If the STA is contained within an AP or is associated
3991                  *         with an AP, the BSSID is the address currently in use
3992                  *         by the STA contained in the AP.
3993                  *
3994                  * So we should not accept data frames with an address that's
3995                  * multicast.
3996                  *
3997                  * Accepting it also opens a security problem because stations
3998                  * could encrypt it with the GTK and inject traffic that way.
3999                  */
4000                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4001                         return false;
4002
4003                 return true;
4004         case NL80211_IFTYPE_WDS:
4005                 if (bssid || !ieee80211_is_data(hdr->frame_control))
4006                         return false;
4007                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
4008         case NL80211_IFTYPE_P2P_DEVICE:
4009                 return ieee80211_is_public_action(hdr, skb->len) ||
4010                        ieee80211_is_probe_req(hdr->frame_control) ||
4011                        ieee80211_is_probe_resp(hdr->frame_control) ||
4012                        ieee80211_is_beacon(hdr->frame_control);
4013         case NL80211_IFTYPE_NAN:
4014                 /* Currently no frames on NAN interface are allowed */
4015                 return false;
4016         default:
4017                 break;
4018         }
4019
4020         WARN_ON_ONCE(1);
4021         return false;
4022 }
4023
4024 void ieee80211_check_fast_rx(struct sta_info *sta)
4025 {
4026         struct ieee80211_sub_if_data *sdata = sta->sdata;
4027         struct ieee80211_local *local = sdata->local;
4028         struct ieee80211_key *key;
4029         struct ieee80211_fast_rx fastrx = {
4030                 .dev = sdata->dev,
4031                 .vif_type = sdata->vif.type,
4032                 .control_port_protocol = sdata->control_port_protocol,
4033         }, *old, *new = NULL;
4034         bool assign = false;
4035
4036         /* use sparse to check that we don't return without updating */
4037         __acquire(check_fast_rx);
4038
4039         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4040         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4041         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4042         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4043
4044         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4045
4046         /* fast-rx doesn't do reordering */
4047         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4048             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4049                 goto clear;
4050
4051         switch (sdata->vif.type) {
4052         case NL80211_IFTYPE_STATION:
4053                 if (sta->sta.tdls) {
4054                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4055                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4056                         fastrx.expected_ds_bits = 0;
4057                 } else {
4058                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
4059                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4060                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4061                         fastrx.expected_ds_bits =
4062                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4063                 }
4064
4065                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4066                         fastrx.expected_ds_bits |=
4067                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4068                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4069                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4070                 }
4071
4072                 if (!sdata->u.mgd.powersave)
4073                         break;
4074
4075                 /* software powersave is a huge mess, avoid all of it */
4076                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4077                         goto clear;
4078                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4079                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4080                         goto clear;
4081                 break;
4082         case NL80211_IFTYPE_AP_VLAN:
4083         case NL80211_IFTYPE_AP:
4084                 /* parallel-rx requires this, at least with calls to
4085                  * ieee80211_sta_ps_transition()
4086                  */
4087                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4088                         goto clear;
4089                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4090                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4091                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4092
4093                 fastrx.internal_forward =
4094                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4095                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4096                          !sdata->u.vlan.sta);
4097
4098                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4099                     sdata->u.vlan.sta) {
4100                         fastrx.expected_ds_bits |=
4101                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4102                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4103                         fastrx.internal_forward = 0;
4104                 }
4105
4106                 break;
4107         default:
4108                 goto clear;
4109         }
4110
4111         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4112                 goto clear;
4113
4114         rcu_read_lock();
4115         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4116         if (key) {
4117                 switch (key->conf.cipher) {
4118                 case WLAN_CIPHER_SUITE_TKIP:
4119                         /* we don't want to deal with MMIC in fast-rx */
4120                         goto clear_rcu;
4121                 case WLAN_CIPHER_SUITE_CCMP:
4122                 case WLAN_CIPHER_SUITE_CCMP_256:
4123                 case WLAN_CIPHER_SUITE_GCMP:
4124                 case WLAN_CIPHER_SUITE_GCMP_256:
4125                         break;
4126                 default:
4127                         /* We also don't want to deal with
4128                          * WEP or cipher scheme.
4129                          */
4130                         goto clear_rcu;
4131                 }
4132
4133                 fastrx.key = true;
4134                 fastrx.icv_len = key->conf.icv_len;
4135         }
4136
4137         assign = true;
4138  clear_rcu:
4139         rcu_read_unlock();
4140  clear:
4141         __release(check_fast_rx);
4142
4143         if (assign)
4144                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4145
4146         spin_lock_bh(&sta->lock);
4147         old = rcu_dereference_protected(sta->fast_rx, true);
4148         rcu_assign_pointer(sta->fast_rx, new);
4149         spin_unlock_bh(&sta->lock);
4150
4151         if (old)
4152                 kfree_rcu(old, rcu_head);
4153 }
4154
4155 void ieee80211_clear_fast_rx(struct sta_info *sta)
4156 {
4157         struct ieee80211_fast_rx *old;
4158
4159         spin_lock_bh(&sta->lock);
4160         old = rcu_dereference_protected(sta->fast_rx, true);
4161         RCU_INIT_POINTER(sta->fast_rx, NULL);
4162         spin_unlock_bh(&sta->lock);
4163
4164         if (old)
4165                 kfree_rcu(old, rcu_head);
4166 }
4167
4168 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4169 {
4170         struct ieee80211_local *local = sdata->local;
4171         struct sta_info *sta;
4172
4173         lockdep_assert_held(&local->sta_mtx);
4174
4175         list_for_each_entry(sta, &local->sta_list, list) {
4176                 if (sdata != sta->sdata &&
4177                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4178                         continue;
4179                 ieee80211_check_fast_rx(sta);
4180         }
4181 }
4182
4183 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4184 {
4185         struct ieee80211_local *local = sdata->local;
4186
4187         mutex_lock(&local->sta_mtx);
4188         __ieee80211_check_fast_rx_iface(sdata);
4189         mutex_unlock(&local->sta_mtx);
4190 }
4191
4192 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4193                                      struct ieee80211_fast_rx *fast_rx)
4194 {
4195         struct sk_buff *skb = rx->skb;
4196         struct ieee80211_hdr *hdr = (void *)skb->data;
4197         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4198         struct sta_info *sta = rx->sta;
4199         int orig_len = skb->len;
4200         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4201         int snap_offs = hdrlen;
4202         struct {
4203                 u8 snap[sizeof(rfc1042_header)];
4204                 __be16 proto;
4205         } *payload __aligned(2);
4206         struct {
4207                 u8 da[ETH_ALEN];
4208                 u8 sa[ETH_ALEN];
4209         } addrs __aligned(2);
4210         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4211
4212         if (fast_rx->uses_rss)
4213                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4214
4215         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4216          * to a common data structure; drivers can implement that per queue
4217          * but we don't have that information in mac80211
4218          */
4219         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4220                 return false;
4221
4222 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4223
4224         /* If using encryption, we also need to have:
4225          *  - PN_VALIDATED: similar, but the implementation is tricky
4226          *  - DECRYPTED: necessary for PN_VALIDATED
4227          */
4228         if (fast_rx->key &&
4229             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4230                 return false;
4231
4232         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4233                 return false;
4234
4235         if (unlikely(ieee80211_is_frag(hdr)))
4236                 return false;
4237
4238         /* Since our interface address cannot be multicast, this
4239          * implicitly also rejects multicast frames without the
4240          * explicit check.
4241          *
4242          * We shouldn't get any *data* frames not addressed to us
4243          * (AP mode will accept multicast *management* frames), but
4244          * punting here will make it go through the full checks in
4245          * ieee80211_accept_frame().
4246          */
4247         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4248                 return false;
4249
4250         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4251                                               IEEE80211_FCTL_TODS)) !=
4252             fast_rx->expected_ds_bits)
4253                 return false;
4254
4255         /* assign the key to drop unencrypted frames (later)
4256          * and strip the IV/MIC if necessary
4257          */
4258         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4259                 /* GCMP header length is the same */
4260                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4261         }
4262
4263         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4264                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4265                         goto drop;
4266
4267                 payload = (void *)(skb->data + snap_offs);
4268
4269                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4270                         return false;
4271
4272                 /* Don't handle these here since they require special code.
4273                  * Accept AARP and IPX even though they should come with a
4274                  * bridge-tunnel header - but if we get them this way then
4275                  * there's little point in discarding them.
4276                  */
4277                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4278                              payload->proto == fast_rx->control_port_protocol))
4279                         return false;
4280         }
4281
4282         /* after this point, don't punt to the slowpath! */
4283
4284         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4285             pskb_trim(skb, skb->len - fast_rx->icv_len))
4286                 goto drop;
4287
4288         if (unlikely(fast_rx->sta_notify)) {
4289                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4290                 fast_rx->sta_notify = false;
4291         }
4292
4293         /* statistics part of ieee80211_rx_h_sta_process() */
4294         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4295                 stats->last_signal = status->signal;
4296                 if (!fast_rx->uses_rss)
4297                         ewma_signal_add(&sta->rx_stats_avg.signal,
4298                                         -status->signal);
4299         }
4300
4301         if (status->chains) {
4302                 int i;
4303
4304                 stats->chains = status->chains;
4305                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4306                         int signal = status->chain_signal[i];
4307
4308                         if (!(status->chains & BIT(i)))
4309                                 continue;
4310
4311                         stats->chain_signal_last[i] = signal;
4312                         if (!fast_rx->uses_rss)
4313                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4314                                                 -signal);
4315                 }
4316         }
4317         /* end of statistics */
4318
4319         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4320                 goto drop;
4321
4322         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4323                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4324                     RX_QUEUED)
4325                         goto drop;
4326
4327                 return true;
4328         }
4329
4330         stats->last_rx = jiffies;
4331         stats->last_rate = sta_stats_encode_rate(status);
4332
4333         stats->fragments++;
4334         stats->packets++;
4335
4336         /* do the header conversion - first grab the addresses */
4337         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4338         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4339         /* remove the SNAP but leave the ethertype */
4340         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4341         /* push the addresses in front */
4342         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4343
4344         skb->dev = fast_rx->dev;
4345
4346         ieee80211_rx_stats(fast_rx->dev, skb->len);
4347
4348         /* The seqno index has the same property as needed
4349          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4350          * for non-QoS-data frames. Here we know it's a data
4351          * frame, so count MSDUs.
4352          */
4353         u64_stats_update_begin(&stats->syncp);
4354         stats->msdu[rx->seqno_idx]++;
4355         stats->bytes += orig_len;
4356         u64_stats_update_end(&stats->syncp);
4357
4358         if (fast_rx->internal_forward) {
4359                 struct sk_buff *xmit_skb = NULL;
4360                 if (is_multicast_ether_addr(addrs.da)) {
4361                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4362                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4363                            sta_info_get(rx->sdata, addrs.da)) {
4364                         xmit_skb = skb;
4365                         skb = NULL;
4366                 }
4367
4368                 if (xmit_skb) {
4369                         /*
4370                          * Send to wireless media and increase priority by 256
4371                          * to keep the received priority instead of
4372                          * reclassifying the frame (see cfg80211_classify8021d).
4373                          */
4374                         xmit_skb->priority += 256;
4375                         xmit_skb->protocol = htons(ETH_P_802_3);
4376                         skb_reset_network_header(xmit_skb);
4377                         skb_reset_mac_header(xmit_skb);
4378                         dev_queue_xmit(xmit_skb);
4379                 }
4380
4381                 if (!skb)
4382                         return true;
4383         }
4384
4385         /* deliver to local stack */
4386         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4387         memset(skb->cb, 0, sizeof(skb->cb));
4388         if (rx->napi)
4389                 napi_gro_receive(rx->napi, skb);
4390         else
4391                 netif_receive_skb(skb);
4392
4393         return true;
4394  drop:
4395         dev_kfree_skb(skb);
4396         stats->dropped++;
4397         return true;
4398 }
4399
4400 /*
4401  * This function returns whether or not the SKB
4402  * was destined for RX processing or not, which,
4403  * if consume is true, is equivalent to whether
4404  * or not the skb was consumed.
4405  */
4406 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4407                                             struct sk_buff *skb, bool consume)
4408 {
4409         struct ieee80211_local *local = rx->local;
4410         struct ieee80211_sub_if_data *sdata = rx->sdata;
4411
4412         rx->skb = skb;
4413
4414         /* See if we can do fast-rx; if we have to copy we already lost,
4415          * so punt in that case. We should never have to deliver a data
4416          * frame to multiple interfaces anyway.
4417          *
4418          * We skip the ieee80211_accept_frame() call and do the necessary
4419          * checking inside ieee80211_invoke_fast_rx().
4420          */
4421         if (consume && rx->sta) {
4422                 struct ieee80211_fast_rx *fast_rx;
4423
4424                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4425                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4426                         return true;
4427         }
4428
4429         if (!ieee80211_accept_frame(rx))
4430                 return false;
4431
4432         if (!consume) {
4433                 skb = skb_copy(skb, GFP_ATOMIC);
4434                 if (!skb) {
4435                         if (net_ratelimit())
4436                                 wiphy_debug(local->hw.wiphy,
4437                                         "failed to copy skb for %s\n",
4438                                         sdata->name);
4439                         return true;
4440                 }
4441
4442                 rx->skb = skb;
4443         }
4444
4445         ieee80211_invoke_rx_handlers(rx);
4446         return true;
4447 }
4448
4449 /*
4450  * This is the actual Rx frames handler. as it belongs to Rx path it must
4451  * be called with rcu_read_lock protection.
4452  */
4453 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4454                                          struct ieee80211_sta *pubsta,
4455                                          struct sk_buff *skb,
4456                                          struct napi_struct *napi)
4457 {
4458         struct ieee80211_local *local = hw_to_local(hw);
4459         struct ieee80211_sub_if_data *sdata;
4460         struct ieee80211_hdr *hdr;
4461         __le16 fc;
4462         struct ieee80211_rx_data rx;
4463         struct ieee80211_sub_if_data *prev;
4464         struct rhlist_head *tmp;
4465         int err = 0;
4466
4467         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4468         memset(&rx, 0, sizeof(rx));
4469         rx.skb = skb;
4470         rx.local = local;
4471         rx.napi = napi;
4472
4473         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4474                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4475
4476         if (ieee80211_is_mgmt(fc)) {
4477                 /* drop frame if too short for header */
4478                 if (skb->len < ieee80211_hdrlen(fc))
4479                         err = -ENOBUFS;
4480                 else
4481                         err = skb_linearize(skb);
4482         } else {
4483                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4484         }
4485
4486         if (err) {
4487                 dev_kfree_skb(skb);
4488                 return;
4489         }
4490
4491         hdr = (struct ieee80211_hdr *)skb->data;
4492         ieee80211_parse_qos(&rx);
4493         ieee80211_verify_alignment(&rx);
4494
4495         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4496                      ieee80211_is_beacon(hdr->frame_control)))
4497                 ieee80211_scan_rx(local, skb);
4498
4499         if (ieee80211_is_data(fc)) {
4500                 struct sta_info *sta, *prev_sta;
4501
4502                 if (pubsta) {
4503                         rx.sta = container_of(pubsta, struct sta_info, sta);
4504                         rx.sdata = rx.sta->sdata;
4505                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4506                                 return;
4507                         goto out;
4508                 }
4509
4510                 prev_sta = NULL;
4511
4512                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4513                         if (!prev_sta) {
4514                                 prev_sta = sta;
4515                                 continue;
4516                         }
4517
4518                         rx.sta = prev_sta;
4519                         rx.sdata = prev_sta->sdata;
4520                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4521
4522                         prev_sta = sta;
4523                 }
4524
4525                 if (prev_sta) {
4526                         rx.sta = prev_sta;
4527                         rx.sdata = prev_sta->sdata;
4528
4529                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4530                                 return;
4531                         goto out;
4532                 }
4533         }
4534
4535         prev = NULL;
4536
4537         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4538                 if (!ieee80211_sdata_running(sdata))
4539                         continue;
4540
4541                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4542                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4543                         continue;
4544
4545                 /*
4546                  * frame is destined for this interface, but if it's
4547                  * not also for the previous one we handle that after
4548                  * the loop to avoid copying the SKB once too much
4549                  */
4550
4551                 if (!prev) {
4552                         prev = sdata;
4553                         continue;
4554                 }
4555
4556                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4557                 rx.sdata = prev;
4558                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4559
4560                 prev = sdata;
4561         }
4562
4563         if (prev) {
4564                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4565                 rx.sdata = prev;
4566
4567                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4568                         return;
4569         }
4570
4571  out:
4572         dev_kfree_skb(skb);
4573 }
4574
4575 /*
4576  * This is the receive path handler. It is called by a low level driver when an
4577  * 802.11 MPDU is received from the hardware.
4578  */
4579 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4580                        struct sk_buff *skb, struct napi_struct *napi)
4581 {
4582         struct ieee80211_local *local = hw_to_local(hw);
4583         struct ieee80211_rate *rate = NULL;
4584         struct ieee80211_supported_band *sband;
4585         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4586
4587         WARN_ON_ONCE(softirq_count() == 0);
4588
4589         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4590                 goto drop;
4591
4592         sband = local->hw.wiphy->bands[status->band];
4593         if (WARN_ON(!sband))
4594                 goto drop;
4595
4596         /*
4597          * If we're suspending, it is possible although not too likely
4598          * that we'd be receiving frames after having already partially
4599          * quiesced the stack. We can't process such frames then since
4600          * that might, for example, cause stations to be added or other
4601          * driver callbacks be invoked.
4602          */
4603         if (unlikely(local->quiescing || local->suspended))
4604                 goto drop;
4605
4606         /* We might be during a HW reconfig, prevent Rx for the same reason */
4607         if (unlikely(local->in_reconfig))
4608                 goto drop;
4609
4610         /*
4611          * The same happens when we're not even started,
4612          * but that's worth a warning.
4613          */
4614         if (WARN_ON(!local->started))
4615                 goto drop;
4616
4617         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4618                 /*
4619                  * Validate the rate, unless a PLCP error means that
4620                  * we probably can't have a valid rate here anyway.
4621                  */
4622
4623                 switch (status->encoding) {
4624                 case RX_ENC_HT:
4625                         /*
4626                          * rate_idx is MCS index, which can be [0-76]
4627                          * as documented on:
4628                          *
4629                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4630                          *
4631                          * Anything else would be some sort of driver or
4632                          * hardware error. The driver should catch hardware
4633                          * errors.
4634                          */
4635                         if (WARN(status->rate_idx > 76,
4636                                  "Rate marked as an HT rate but passed "
4637                                  "status->rate_idx is not "
4638                                  "an MCS index [0-76]: %d (0x%02x)\n",
4639                                  status->rate_idx,
4640                                  status->rate_idx))
4641                                 goto drop;
4642                         break;
4643                 case RX_ENC_VHT:
4644                         if (WARN_ONCE(status->rate_idx > 9 ||
4645                                       !status->nss ||
4646                                       status->nss > 8,
4647                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4648                                       status->rate_idx, status->nss))
4649                                 goto drop;
4650                         break;
4651                 case RX_ENC_HE:
4652                         if (WARN_ONCE(status->rate_idx > 11 ||
4653                                       !status->nss ||
4654                                       status->nss > 8,
4655                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4656                                       status->rate_idx, status->nss))
4657                                 goto drop;
4658                         break;
4659                 default:
4660                         WARN_ON_ONCE(1);
4661                         /* fall through */
4662                 case RX_ENC_LEGACY:
4663                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4664                                 goto drop;
4665                         rate = &sband->bitrates[status->rate_idx];
4666                 }
4667         }
4668
4669         status->rx_flags = 0;
4670
4671         /*
4672          * key references and virtual interfaces are protected using RCU
4673          * and this requires that we are in a read-side RCU section during
4674          * receive processing
4675          */
4676         rcu_read_lock();
4677
4678         /*
4679          * Frames with failed FCS/PLCP checksum are not returned,
4680          * all other frames are returned without radiotap header
4681          * if it was previously present.
4682          * Also, frames with less than 16 bytes are dropped.
4683          */
4684         skb = ieee80211_rx_monitor(local, skb, rate);
4685         if (!skb) {
4686                 rcu_read_unlock();
4687                 return;
4688         }
4689
4690         ieee80211_tpt_led_trig_rx(local,
4691                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4692                         skb->len);
4693
4694         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4695
4696         rcu_read_unlock();
4697
4698         return;
4699  drop:
4700         kfree_skb(skb);
4701 }
4702 EXPORT_SYMBOL(ieee80211_rx_napi);
4703
4704 /* This is a version of the rx handler that can be called from hard irq
4705  * context. Post the skb on the queue and schedule the tasklet */
4706 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4707 {
4708         struct ieee80211_local *local = hw_to_local(hw);
4709
4710         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4711
4712         skb->pkt_type = IEEE80211_RX_MSG;
4713         skb_queue_tail(&local->skb_queue, skb);
4714         tasklet_schedule(&local->tasklet);
4715 }
4716 EXPORT_SYMBOL(ieee80211_rx_irqsafe);