net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018-2019 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/jiffies.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/export.h>
  23 #include <linux/bitops.h>
  24 #include <net/mac80211.h>
  25 #include <net/ieee80211_radiotap.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "led.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "rate.h"
  37
  38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  39 {
  40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  41
  42         u64_stats_update_begin(&tstats->syncp);
  43         tstats->rx_packets++;
  44         tstats->rx_bytes += len;
  45         u64_stats_update_end(&tstats->syncp);
  46 }
  47
  48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                                enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53         if (ieee80211_is_data(fc)) {
  54                 if (len < 24) /* drop incorrect hdr len (data) */
  55                         return NULL;
  56
  57                 if (ieee80211_has_a4(fc))
  58                         return NULL;
  59                 if (ieee80211_has_tods(fc))
  60                         return hdr->addr1;
  61                 if (ieee80211_has_fromds(fc))
  62                         return hdr->addr2;
  63
  64                 return hdr->addr3;
  65         }
  66
  67         if (ieee80211_is_mgmt(fc)) {
  68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  69                         return NULL;
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_ctl(fc)) {
  74                 if (ieee80211_is_pspoll(fc))
  75                         return hdr->addr1;
  76
  77                 if (ieee80211_is_back_req(fc)) {
  78                         switch (type) {
  79                         case NL80211_IFTYPE_STATION:
  80                                 return hdr->addr2;
  81                         case NL80211_IFTYPE_AP:
  82                         case NL80211_IFTYPE_AP_VLAN:
  83                                 return hdr->addr1;
  84                         default:
  85                                 break; /* fall through to the return */
  86                         }
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94  * monitor mode reception
  95  *
  96  * This function cleans up the SKB, i.e. it removes all the stuff
  97  * only useful for monitoring.
  98  */
  99 static void remove_monitor_info(struct sk_buff *skb,
 100                                 unsigned int present_fcs_len,
 101                                 unsigned int rtap_space)
 102 {
 103         if (present_fcs_len)
 104                 __pskb_trim(skb, skb->len - present_fcs_len);
 105         __pskb_pull(skb, rtap_space);
 106 }
 107
 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 109                                      unsigned int rtap_space)
 110 {
 111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 112         struct ieee80211_hdr *hdr;
 113
 114         hdr = (void *)(skb->data + rtap_space);
 115
 116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 117                             RX_FLAG_FAILED_PLCP_CRC |
 118                             RX_FLAG_ONLY_MONITOR |
 119                             RX_FLAG_NO_PSDU))
 120                 return true;
 121
 122         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 123                 return true;
 124
 125         if (ieee80211_is_ctl(hdr->frame_control) &&
 126             !ieee80211_is_pspoll(hdr->frame_control) &&
 127             !ieee80211_is_back_req(hdr->frame_control))
 128                 return true;
 129
 130         return false;
 131 }
 132
 133 static int
 134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 135                              struct ieee80211_rx_status *status,
 136                              struct sk_buff *skb)
 137 {
 138         int len;
 139
 140         /* always present fields */
 141         len = sizeof(struct ieee80211_radiotap_header) + 8;
 142
 143         /* allocate extra bitmaps */
 144         if (status->chains)
 145                 len += 4 * hweight8(status->chains);
 146         /* vendor presence bitmap */
 147         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 148                 len += 4;
 149
 150         if (ieee80211_have_rx_timestamp(status)) {
 151                 len = ALIGN(len, 8);
 152                 len += 8;
 153         }
 154         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 155                 len += 1;
 156
 157         /* antenna field, if we don't have per-chain info */
 158         if (!status->chains)
 159                 len += 1;
 160
 161         /* padding for RX_FLAGS if necessary */
 162         len = ALIGN(len, 2);
 163
 164         if (status->encoding == RX_ENC_HT) /* HT info */
 165                 len += 3;
 166
 167         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 168                 len = ALIGN(len, 4);
 169                 len += 8;
 170         }
 171
 172         if (status->encoding == RX_ENC_VHT) {
 173                 len = ALIGN(len, 2);
 174                 len += 12;
 175         }
 176
 177         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 178                 len = ALIGN(len, 8);
 179                 len += 12;
 180         }
 181
 182         if (status->encoding == RX_ENC_HE &&
 183             status->flag & RX_FLAG_RADIOTAP_HE) {
 184                 len = ALIGN(len, 2);
 185                 len += 12;
 186                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 187         }
 188
 189         if (status->encoding == RX_ENC_HE &&
 190             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 191                 len = ALIGN(len, 2);
 192                 len += 12;
 193                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 194         }
 195
 196         if (status->flag & RX_FLAG_NO_PSDU)
 197                 len += 1;
 198
 199         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 200                 len = ALIGN(len, 2);
 201                 len += 4;
 202                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 203         }
 204
 205         if (status->chains) {
 206                 /* antenna and antenna signal fields */
 207                 len += 2 * hweight8(status->chains);
 208         }
 209
 210         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 211                 struct ieee80211_vendor_radiotap *rtap;
 212                 int vendor_data_offset = 0;
 213
 214                 /*
 215                  * The position to look at depends on the existence (or non-
 216                  * existence) of other elements, so take that into account...
 217                  */
 218                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 219                         vendor_data_offset +=
 220                                 sizeof(struct ieee80211_radiotap_he);
 221                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 222                         vendor_data_offset +=
 223                                 sizeof(struct ieee80211_radiotap_he_mu);
 224                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 225                         vendor_data_offset +=
 226                                 sizeof(struct ieee80211_radiotap_lsig);
 227
 228                 rtap = (void *)&skb->data[vendor_data_offset];
 229
 230                 /* alignment for fixed 6-byte vendor data header */
 231                 len = ALIGN(len, 2);
 232                 /* vendor data header */
 233                 len += 6;
 234                 if (WARN_ON(rtap->align == 0))
 235                         rtap->align = 1;
 236                 len = ALIGN(len, rtap->align);
 237                 len += rtap->len + rtap->pad;
 238         }
 239
 240         return len;
 241 }
 242
 243 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 244                                          struct sk_buff *skb,
 245                                          int rtap_space)
 246 {
 247         struct {
 248                 struct ieee80211_hdr_3addr hdr;
 249                 u8 category;
 250                 u8 action_code;
 251         } __packed __aligned(2) action;
 252
 253         if (!sdata)
 254                 return;
 255
 256         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 257
 258         if (skb->len < rtap_space + sizeof(action) +
 259                        VHT_MUMIMO_GROUPS_DATA_LEN)
 260                 return;
 261
 262         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 263                 return;
 264
 265         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 266
 267         if (!ieee80211_is_action(action.hdr.frame_control))
 268                 return;
 269
 270         if (action.category != WLAN_CATEGORY_VHT)
 271                 return;
 272
 273         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 274                 return;
 275
 276         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 277                 return;
 278
 279         skb = skb_copy(skb, GFP_ATOMIC);
 280         if (!skb)
 281                 return;
 282
 283         skb_queue_tail(&sdata->skb_queue, skb);
 284         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 285 }
 286
 287 /*
 288  * ieee80211_add_rx_radiotap_header - add radiotap header
 289  *
 290  * add a radiotap header containing all the fields which the hardware provided.
 291  */
 292 static void
 293 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 294                                  struct sk_buff *skb,
 295                                  struct ieee80211_rate *rate,
 296                                  int rtap_len, bool has_fcs)
 297 {
 298         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 299         struct ieee80211_radiotap_header *rthdr;
 300         unsigned char *pos;
 301         __le32 *it_present;
 302         u32 it_present_val;
 303         u16 rx_flags = 0;
 304         u16 channel_flags = 0;
 305         int mpdulen, chain;
 306         unsigned long chains = status->chains;
 307         struct ieee80211_vendor_radiotap rtap = {};
 308         struct ieee80211_radiotap_he he = {};
 309         struct ieee80211_radiotap_he_mu he_mu = {};
 310         struct ieee80211_radiotap_lsig lsig = {};
 311
 312         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 313                 he = *(struct ieee80211_radiotap_he *)skb->data;
 314                 skb_pull(skb, sizeof(he));
 315                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 316         }
 317
 318         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 319                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 320                 skb_pull(skb, sizeof(he_mu));
 321         }
 322
 323         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 324                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 325                 skb_pull(skb, sizeof(lsig));
 326         }
 327
 328         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 329                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 330                 /* rtap.len and rtap.pad are undone immediately */
 331                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 332         }
 333
 334         mpdulen = skb->len;
 335         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 336                 mpdulen += FCS_LEN;
 337
 338         rthdr = skb_push(skb, rtap_len);
 339         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 340         it_present = &rthdr->it_present;
 341
 342         /* radiotap header, set always present flags */
 343         rthdr->it_len = cpu_to_le16(rtap_len);
 344         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 345                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 346                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 347
 348         if (!status->chains)
 349                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 350
 351         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 352                 it_present_val |=
 353                         BIT(IEEE80211_RADIOTAP_EXT) |
 354                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 355                 put_unaligned_le32(it_present_val, it_present);
 356                 it_present++;
 357                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 358                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 359         }
 360
 361         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 362                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 363                                   BIT(IEEE80211_RADIOTAP_EXT);
 364                 put_unaligned_le32(it_present_val, it_present);
 365                 it_present++;
 366                 it_present_val = rtap.present;
 367         }
 368
 369         put_unaligned_le32(it_present_val, it_present);
 370
 371         pos = (void *)(it_present + 1);
 372
 373         /* the order of the following fields is important */
 374
 375         /* IEEE80211_RADIOTAP_TSFT */
 376         if (ieee80211_have_rx_timestamp(status)) {
 377                 /* padding */
 378                 while ((pos - (u8 *)rthdr) & 7)
 379                         *pos++ = 0;
 380                 put_unaligned_le64(
 381                         ieee80211_calculate_rx_timestamp(local, status,
 382                                                          mpdulen, 0),
 383                         pos);
 384                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 385                 pos += 8;
 386         }
 387
 388         /* IEEE80211_RADIOTAP_FLAGS */
 389         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 390                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 391         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 392                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 393         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 394                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 395         pos++;
 396
 397         /* IEEE80211_RADIOTAP_RATE */
 398         if (!rate || status->encoding != RX_ENC_LEGACY) {
 399                 /*
 400                  * Without rate information don't add it. If we have,
 401                  * MCS information is a separate field in radiotap,
 402                  * added below. The byte here is needed as padding
 403                  * for the channel though, so initialise it to 0.
 404                  */
 405                 *pos = 0;
 406         } else {
 407                 int shift = 0;
 408                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 409                 if (status->bw == RATE_INFO_BW_10)
 410                         shift = 1;
 411                 else if (status->bw == RATE_INFO_BW_5)
 412                         shift = 2;
 413                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 414         }
 415         pos++;
 416
 417         /* IEEE80211_RADIOTAP_CHANNEL */
 418         put_unaligned_le16(status->freq, pos);
 419         pos += 2;
 420         if (status->bw == RATE_INFO_BW_10)
 421                 channel_flags |= IEEE80211_CHAN_HALF;
 422         else if (status->bw == RATE_INFO_BW_5)
 423                 channel_flags |= IEEE80211_CHAN_QUARTER;
 424
 425         if (status->band == NL80211_BAND_5GHZ)
 426                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 427         else if (status->encoding != RX_ENC_LEGACY)
 428                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 429         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 430                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 431         else if (rate)
 432                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 433         else
 434                 channel_flags |= IEEE80211_CHAN_2GHZ;
 435         put_unaligned_le16(channel_flags, pos);
 436         pos += 2;
 437
 438         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 439         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 440             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 441                 *pos = status->signal;
 442                 rthdr->it_present |=
 443                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 444                 pos++;
 445         }
 446
 447         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 448
 449         if (!status->chains) {
 450                 /* IEEE80211_RADIOTAP_ANTENNA */
 451                 *pos = status->antenna;
 452                 pos++;
 453         }
 454
 455         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 456
 457         /* IEEE80211_RADIOTAP_RX_FLAGS */
 458         /* ensure 2 byte alignment for the 2 byte field as required */
 459         if ((pos - (u8 *)rthdr) & 1)
 460                 *pos++ = 0;
 461         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 462                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 463         put_unaligned_le16(rx_flags, pos);
 464         pos += 2;
 465
 466         if (status->encoding == RX_ENC_HT) {
 467                 unsigned int stbc;
 468
 469                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 470                 *pos++ = local->hw.radiotap_mcs_details;
 471                 *pos = 0;
 472                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 473                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 474                 if (status->bw == RATE_INFO_BW_40)
 475                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 476                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 477                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 478                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 479                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 480                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 481                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 482                 pos++;
 483                 *pos++ = status->rate_idx;
 484         }
 485
 486         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 487                 u16 flags = 0;
 488
 489                 /* ensure 4 byte alignment */
 490                 while ((pos - (u8 *)rthdr) & 3)
 491                         pos++;
 492                 rthdr->it_present |=
 493                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 494                 put_unaligned_le32(status->ampdu_reference, pos);
 495                 pos += 4;
 496                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 497                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 498                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 499                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 500                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 501                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 502                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 503                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 504                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 505                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 506                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 507                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 508                 put_unaligned_le16(flags, pos);
 509                 pos += 2;
 510                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 511                         *pos++ = status->ampdu_delimiter_crc;
 512                 else
 513                         *pos++ = 0;
 514                 *pos++ = 0;
 515         }
 516
 517         if (status->encoding == RX_ENC_VHT) {
 518                 u16 known = local->hw.radiotap_vht_details;
 519
 520                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 521                 put_unaligned_le16(known, pos);
 522                 pos += 2;
 523                 /* flags */
 524                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 526                 /* in VHT, STBC is binary */
 527                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 528                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 529                 if (status->enc_flags & RX_ENC_FLAG_BF)
 530                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 531                 pos++;
 532                 /* bandwidth */
 533                 switch (status->bw) {
 534                 case RATE_INFO_BW_80:
 535                         *pos++ = 4;
 536                         break;
 537                 case RATE_INFO_BW_160:
 538                         *pos++ = 11;
 539                         break;
 540                 case RATE_INFO_BW_40:
 541                         *pos++ = 1;
 542                         break;
 543                 default:
 544                         *pos++ = 0;
 545                 }
 546                 /* MCS/NSS */
 547                 *pos = (status->rate_idx << 4) | status->nss;
 548                 pos += 4;
 549                 /* coding field */
 550                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 551                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 552                 pos++;
 553                 /* group ID */
 554                 pos++;
 555                 /* partial_aid */
 556                 pos += 2;
 557         }
 558
 559         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 560                 u16 accuracy = 0;
 561                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 562
 563                 rthdr->it_present |=
 564                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 565
 566                 /* ensure 8 byte alignment */
 567                 while ((pos - (u8 *)rthdr) & 7)
 568                         pos++;
 569
 570                 put_unaligned_le64(status->device_timestamp, pos);
 571                 pos += sizeof(u64);
 572
 573                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 574                         accuracy = local->hw.radiotap_timestamp.accuracy;
 575                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 576                 }
 577                 put_unaligned_le16(accuracy, pos);
 578                 pos += sizeof(u16);
 579
 580                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 581                 *pos++ = flags;
 582         }
 583
 584         if (status->encoding == RX_ENC_HE &&
 585             status->flag & RX_FLAG_RADIOTAP_HE) {
 586 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 587
 588                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 589                         he.data6 |= HE_PREP(DATA6_NSTS,
 590                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 591                                                       status->enc_flags));
 592                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 593                 } else {
 594                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 595                 }
 596
 597 #define CHECK_GI(s) \
 598         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 599                      (int)NL80211_RATE_INFO_HE_GI_##s)
 600
 601                 CHECK_GI(0_8);
 602                 CHECK_GI(1_6);
 603                 CHECK_GI(3_2);
 604
 605                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 606                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 607                 he.data3 |= HE_PREP(DATA3_CODING,
 608                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 609
 610                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 611
 612                 switch (status->bw) {
 613                 case RATE_INFO_BW_20:
 614                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 615                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 616                         break;
 617                 case RATE_INFO_BW_40:
 618                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 619                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 620                         break;
 621                 case RATE_INFO_BW_80:
 622                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 623                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 624                         break;
 625                 case RATE_INFO_BW_160:
 626                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 627                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 628                         break;
 629                 case RATE_INFO_BW_HE_RU:
 630 #define CHECK_RU_ALLOC(s) \
 631         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 632                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 633
 634                         CHECK_RU_ALLOC(26);
 635                         CHECK_RU_ALLOC(52);
 636                         CHECK_RU_ALLOC(106);
 637                         CHECK_RU_ALLOC(242);
 638                         CHECK_RU_ALLOC(484);
 639                         CHECK_RU_ALLOC(996);
 640                         CHECK_RU_ALLOC(2x996);
 641
 642                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 643                                             status->he_ru + 4);
 644                         break;
 645                 default:
 646                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 647                 }
 648
 649                 /* ensure 2 byte alignment */
 650                 while ((pos - (u8 *)rthdr) & 1)
 651                         pos++;
 652                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 653                 memcpy(pos, &he, sizeof(he));
 654                 pos += sizeof(he);
 655         }
 656
 657         if (status->encoding == RX_ENC_HE &&
 658             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 659                 /* ensure 2 byte alignment */
 660                 while ((pos - (u8 *)rthdr) & 1)
 661                         pos++;
 662                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
 663                 memcpy(pos, &he_mu, sizeof(he_mu));
 664                 pos += sizeof(he_mu);
 665         }
 666
 667         if (status->flag & RX_FLAG_NO_PSDU) {
 668                 rthdr->it_present |=
 669                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
 670                 *pos++ = status->zero_length_psdu_type;
 671         }
 672
 673         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 674                 /* ensure 2 byte alignment */
 675                 while ((pos - (u8 *)rthdr) & 1)
 676                         pos++;
 677                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
 678                 memcpy(pos, &lsig, sizeof(lsig));
 679                 pos += sizeof(lsig);
 680         }
 681
 682         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 683                 *pos++ = status->chain_signal[chain];
 684                 *pos++ = chain;
 685         }
 686
 687         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 688                 /* ensure 2 byte alignment for the vendor field as required */
 689                 if ((pos - (u8 *)rthdr) & 1)
 690                         *pos++ = 0;
 691                 *pos++ = rtap.oui[0];
 692                 *pos++ = rtap.oui[1];
 693                 *pos++ = rtap.oui[2];
 694                 *pos++ = rtap.subns;
 695                 put_unaligned_le16(rtap.len, pos);
 696                 pos += 2;
 697                 /* align the actual payload as requested */
 698                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 699                         *pos++ = 0;
 700                 /* data (and possible padding) already follows */
 701         }
 702 }
 703
 704 static struct sk_buff *
 705 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 706                            struct sk_buff **origskb,
 707                            struct ieee80211_rate *rate,
 708                            int rtap_space, bool use_origskb)
 709 {
 710         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 711         int rt_hdrlen, needed_headroom;
 712         struct sk_buff *skb;
 713
 714         /* room for the radiotap header based on driver features */
 715         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 716         needed_headroom = rt_hdrlen - rtap_space;
 717
 718         if (use_origskb) {
 719                 /* only need to expand headroom if necessary */
 720                 skb = *origskb;
 721                 *origskb = NULL;
 722
 723                 /*
 724                  * This shouldn't trigger often because most devices have an
 725                  * RX header they pull before we get here, and that should
 726                  * be big enough for our radiotap information. We should
 727                  * probably export the length to drivers so that we can have
 728                  * them allocate enough headroom to start with.
 729                  */
 730                 if (skb_headroom(skb) < needed_headroom &&
 731                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 732                         dev_kfree_skb(skb);
 733                         return NULL;
 734                 }
 735         } else {
 736                 /*
 737                  * Need to make a copy and possibly remove radiotap header
 738                  * and FCS from the original.
 739                  */
 740                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 741
 742                 if (!skb)
 743                         return NULL;
 744         }
 745
 746         /* prepend radiotap information */
 747         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 748
 749         skb_reset_mac_header(skb);
 750         skb->ip_summed = CHECKSUM_UNNECESSARY;
 751         skb->pkt_type = PACKET_OTHERHOST;
 752         skb->protocol = htons(ETH_P_802_2);
 753
 754         return skb;
 755 }
 756
 757 /*
 758  * This function copies a received frame to all monitor interfaces and
 759  * returns a cleaned-up SKB that no longer includes the FCS nor the
 760  * radiotap header the driver might have added.
 761  */
 762 static struct sk_buff *
 763 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 764                      struct ieee80211_rate *rate)
 765 {
 766         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 767         struct ieee80211_sub_if_data *sdata;
 768         struct sk_buff *monskb = NULL;
 769         int present_fcs_len = 0;
 770         unsigned int rtap_space = 0;
 771         struct ieee80211_sub_if_data *monitor_sdata =
 772                 rcu_dereference(local->monitor_sdata);
 773         bool only_monitor = false;
 774         unsigned int min_head_len;
 775
 776         if (status->flag & RX_FLAG_RADIOTAP_HE)
 777                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 778
 779         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 780                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 781
 782         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 783                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 784
 785         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 786                 struct ieee80211_vendor_radiotap *rtap =
 787                         (void *)(origskb->data + rtap_space);
 788
 789                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 790         }
 791
 792         min_head_len = rtap_space;
 793
 794         /*
 795          * First, we may need to make a copy of the skb because
 796          *  (1) we need to modify it for radiotap (if not present), and
 797          *  (2) the other RX handlers will modify the skb we got.
 798          *
 799          * We don't need to, of course, if we aren't going to return
 800          * the SKB because it has a bad FCS/PLCP checksum.
 801          */
 802
 803         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 804                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 805                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 806                                 /* driver bug */
 807                                 WARN_ON(1);
 808                                 dev_kfree_skb(origskb);
 809                                 return NULL;
 810                         }
 811                         present_fcs_len = FCS_LEN;
 812                 }
 813
 814                 /* also consider the hdr->frame_control */
 815                 min_head_len += 2;
 816         }
 817
 818         /* ensure that the expected data elements are in skb head */
 819         if (!pskb_may_pull(origskb, min_head_len)) {
 820                 dev_kfree_skb(origskb);
 821                 return NULL;
 822         }
 823
 824         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 825
 826         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 827                 if (only_monitor) {
 828                         dev_kfree_skb(origskb);
 829                         return NULL;
 830                 }
 831
 832                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
 833                 return origskb;
 834         }
 835
 836         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 837
 838         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 839                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 840                                                  &local->mon_list);
 841
 842                 if (!monskb)
 843                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 844                                                             rate, rtap_space,
 845                                                             only_monitor &&
 846                                                             last_monitor);
 847
 848                 if (monskb) {
 849                         struct sk_buff *skb;
 850
 851                         if (last_monitor) {
 852                                 skb = monskb;
 853                                 monskb = NULL;
 854                         } else {
 855                                 skb = skb_clone(monskb, GFP_ATOMIC);
 856                         }
 857
 858                         if (skb) {
 859                                 skb->dev = sdata->dev;
 860                                 ieee80211_rx_stats(skb->dev, skb->len);
 861                                 netif_receive_skb(skb);
 862                         }
 863                 }
 864
 865                 if (last_monitor)
 866                         break;
 867         }
 868
 869         /* this happens if last_monitor was erroneously false */
 870         dev_kfree_skb(monskb);
 871
 872         /* ditto */
 873         if (!origskb)
 874                 return NULL;
 875
 876         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 877         return origskb;
 878 }
 879
 880 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 881 {
 882         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 883         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 884         int tid, seqno_idx, security_idx;
 885
 886         /* does the frame have a qos control field? */
 887         if (ieee80211_is_data_qos(hdr->frame_control)) {
 888                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 889                 /* frame has qos control */
 890                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 891                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 892                         status->rx_flags |= IEEE80211_RX_AMSDU;
 893
 894                 seqno_idx = tid;
 895                 security_idx = tid;
 896         } else {
 897                 /*
 898                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 899                  *
 900                  *      Sequence numbers for management frames, QoS data
 901                  *      frames with a broadcast/multicast address in the
 902                  *      Address 1 field, and all non-QoS data frames sent
 903                  *      by QoS STAs are assigned using an additional single
 904                  *      modulo-4096 counter, [...]
 905                  *
 906                  * We also use that counter for non-QoS STAs.
 907                  */
 908                 seqno_idx = IEEE80211_NUM_TIDS;
 909                 security_idx = 0;
 910                 if (ieee80211_is_mgmt(hdr->frame_control))
 911                         security_idx = IEEE80211_NUM_TIDS;
 912                 tid = 0;
 913         }
 914
 915         rx->seqno_idx = seqno_idx;
 916         rx->security_idx = security_idx;
 917         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 918          * For now, set skb->priority to 0 for other cases. */
 919         rx->skb->priority = (tid > 7) ? 0 : tid;
 920 }
 921
 922 /**
 923  * DOC: Packet alignment
 924  *
 925  * Drivers always need to pass packets that are aligned to two-byte boundaries
 926  * to the stack.
 927  *
 928  * Additionally, should, if possible, align the payload data in a way that
 929  * guarantees that the contained IP header is aligned to a four-byte
 930  * boundary. In the case of regular frames, this simply means aligning the
 931  * payload to a four-byte boundary (because either the IP header is directly
 932  * contained, or IV/RFC1042 headers that have a length divisible by four are
 933  * in front of it).  If the payload data is not properly aligned and the
 934  * architecture doesn't support efficient unaligned operations, mac80211
 935  * will align the data.
 936  *
 937  * With A-MSDU frames, however, the payload data address must yield two modulo
 938  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 939  * push the IP header further back to a multiple of four again. Thankfully, the
 940  * specs were sane enough this time around to require padding each A-MSDU
 941  * subframe to a length that is a multiple of four.
 942  *
 943  * Padding like Atheros hardware adds which is between the 802.11 header and
 944  * the payload is not supported, the driver is required to move the 802.11
 945  * header to be directly in front of the payload in that case.
 946  */
 947 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 948 {
 949 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 950         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 951 #endif
 952 }
 953
 954
 955 /* rx handlers */
 956
 957 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 958 {
 959         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 960
 961         if (is_multicast_ether_addr(hdr->addr1))
 962                 return 0;
 963
 964         return ieee80211_is_robust_mgmt_frame(skb);
 965 }
 966
 967
 968 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 969 {
 970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 971
 972         if (!is_multicast_ether_addr(hdr->addr1))
 973                 return 0;
 974
 975         return ieee80211_is_robust_mgmt_frame(skb);
 976 }
 977
 978
 979 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 980 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 981 {
 982         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 983         struct ieee80211_mmie *mmie;
 984         struct ieee80211_mmie_16 *mmie16;
 985
 986         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 987                 return -1;
 988
 989         if (!ieee80211_is_robust_mgmt_frame(skb))
 990                 return -1; /* not a robust management frame */
 991
 992         mmie = (struct ieee80211_mmie *)
 993                 (skb->data + skb->len - sizeof(*mmie));
 994         if (mmie->element_id == WLAN_EID_MMIE &&
 995             mmie->length == sizeof(*mmie) - 2)
 996                 return le16_to_cpu(mmie->key_id);
 997
 998         mmie16 = (struct ieee80211_mmie_16 *)
 999                 (skb->data + skb->len - sizeof(*mmie16));
1000         if (skb->len >= 24 + sizeof(*mmie16) &&
1001             mmie16->element_id == WLAN_EID_MMIE &&
1002             mmie16->length == sizeof(*mmie16) - 2)
1003                 return le16_to_cpu(mmie16->key_id);
1004
1005         return -1;
1006 }
1007
1008 static int ieee80211_get_keyid(struct sk_buff *skb,
1009                                const struct ieee80211_cipher_scheme *cs)
1010 {
1011         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1012         __le16 fc;
1013         int hdrlen;
1014         int minlen;
1015         u8 key_idx_off;
1016         u8 key_idx_shift;
1017         u8 keyid;
1018
1019         fc = hdr->frame_control;
1020         hdrlen = ieee80211_hdrlen(fc);
1021
1022         if (cs) {
1023                 minlen = hdrlen + cs->hdr_len;
1024                 key_idx_off = hdrlen + cs->key_idx_off;
1025                 key_idx_shift = cs->key_idx_shift;
1026         } else {
1027                 /* WEP, TKIP, CCMP and GCMP */
1028                 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1029                 key_idx_off = hdrlen + 3;
1030                 key_idx_shift = 6;
1031         }
1032
1033         if (unlikely(skb->len < minlen))
1034                 return -EINVAL;
1035
1036         skb_copy_bits(skb, key_idx_off, &keyid, 1);
1037
1038         if (cs)
1039                 keyid &= cs->key_idx_mask;
1040         keyid >>= key_idx_shift;
1041
1042         /* cs could use more than the usual two bits for the keyid */
1043         if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1044                 return -EINVAL;
1045
1046         return keyid;
1047 }
1048
1049 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1050 {
1051         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1052         char *dev_addr = rx->sdata->vif.addr;
1053
1054         if (ieee80211_is_data(hdr->frame_control)) {
1055                 if (is_multicast_ether_addr(hdr->addr1)) {
1056                         if (ieee80211_has_tods(hdr->frame_control) ||
1057                             !ieee80211_has_fromds(hdr->frame_control))
1058                                 return RX_DROP_MONITOR;
1059                         if (ether_addr_equal(hdr->addr3, dev_addr))
1060                                 return RX_DROP_MONITOR;
1061                 } else {
1062                         if (!ieee80211_has_a4(hdr->frame_control))
1063                                 return RX_DROP_MONITOR;
1064                         if (ether_addr_equal(hdr->addr4, dev_addr))
1065                                 return RX_DROP_MONITOR;
1066                 }
1067         }
1068
1069         /* If there is not an established peer link and this is not a peer link
1070          * establisment frame, beacon or probe, drop the frame.
1071          */
1072
1073         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1074                 struct ieee80211_mgmt *mgmt;
1075
1076                 if (!ieee80211_is_mgmt(hdr->frame_control))
1077                         return RX_DROP_MONITOR;
1078
1079                 if (ieee80211_is_action(hdr->frame_control)) {
1080                         u8 category;
1081
1082                         /* make sure category field is present */
1083                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1084                                 return RX_DROP_MONITOR;
1085
1086                         mgmt = (struct ieee80211_mgmt *)hdr;
1087                         category = mgmt->u.action.category;
1088                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1089                             category != WLAN_CATEGORY_SELF_PROTECTED)
1090                                 return RX_DROP_MONITOR;
1091                         return RX_CONTINUE;
1092                 }
1093
1094                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1095                     ieee80211_is_probe_resp(hdr->frame_control) ||
1096                     ieee80211_is_beacon(hdr->frame_control) ||
1097                     ieee80211_is_auth(hdr->frame_control))
1098                         return RX_CONTINUE;
1099
1100                 return RX_DROP_MONITOR;
1101         }
1102
1103         return RX_CONTINUE;
1104 }
1105
1106 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1107                                               int index)
1108 {
1109         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1110         struct sk_buff *tail = skb_peek_tail(frames);
1111         struct ieee80211_rx_status *status;
1112
1113         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1114                 return true;
1115
1116         if (!tail)
1117                 return false;
1118
1119         status = IEEE80211_SKB_RXCB(tail);
1120         if (status->flag & RX_FLAG_AMSDU_MORE)
1121                 return false;
1122
1123         return true;
1124 }
1125
1126 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1127                                             struct tid_ampdu_rx *tid_agg_rx,
1128                                             int index,
1129                                             struct sk_buff_head *frames)
1130 {
1131         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1132         struct sk_buff *skb;
1133         struct ieee80211_rx_status *status;
1134
1135         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1136
1137         if (skb_queue_empty(skb_list))
1138                 goto no_frame;
1139
1140         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1141                 __skb_queue_purge(skb_list);
1142                 goto no_frame;
1143         }
1144
1145         /* release frames from the reorder ring buffer */
1146         tid_agg_rx->stored_mpdu_num--;
1147         while ((skb = __skb_dequeue(skb_list))) {
1148                 status = IEEE80211_SKB_RXCB(skb);
1149                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1150                 __skb_queue_tail(frames, skb);
1151         }
1152
1153 no_frame:
1154         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1155         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1156 }
1157
1158 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1159                                              struct tid_ampdu_rx *tid_agg_rx,
1160                                              u16 head_seq_num,
1161                                              struct sk_buff_head *frames)
1162 {
1163         int index;
1164
1165         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1166
1167         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1168                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1169                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1170                                                 frames);
1171         }
1172 }
1173
1174 /*
1175  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1176  * the skb was added to the buffer longer than this time ago, the earlier
1177  * frames that have not yet been received are assumed to be lost and the skb
1178  * can be released for processing. This may also release other skb's from the
1179  * reorder buffer if there are no additional gaps between the frames.
1180  *
1181  * Callers must hold tid_agg_rx->reorder_lock.
1182  */
1183 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1184
1185 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1186                                           struct tid_ampdu_rx *tid_agg_rx,
1187                                           struct sk_buff_head *frames)
1188 {
1189         int index, i, j;
1190
1191         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1192
1193         /* release the buffer until next missing frame */
1194         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1195         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1196             tid_agg_rx->stored_mpdu_num) {
1197                 /*
1198                  * No buffers ready to be released, but check whether any
1199                  * frames in the reorder buffer have timed out.
1200                  */
1201                 int skipped = 1;
1202                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1203                      j = (j + 1) % tid_agg_rx->buf_size) {
1204                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1205                                 skipped++;
1206                                 continue;
1207                         }
1208                         if (skipped &&
1209                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1210                                         HT_RX_REORDER_BUF_TIMEOUT))
1211                                 goto set_release_timer;
1212
1213                         /* don't leave incomplete A-MSDUs around */
1214                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1215                              i = (i + 1) % tid_agg_rx->buf_size)
1216                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1217
1218                         ht_dbg_ratelimited(sdata,
1219                                            "release an RX reorder frame due to timeout on earlier frames\n");
1220                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1221                                                         frames);
1222
1223                         /*
1224                          * Increment the head seq# also for the skipped slots.
1225                          */
1226                         tid_agg_rx->head_seq_num =
1227                                 (tid_agg_rx->head_seq_num +
1228                                  skipped) & IEEE80211_SN_MASK;
1229                         skipped = 0;
1230                 }
1231         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1232                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1233                                                 frames);
1234                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1235         }
1236
1237         if (tid_agg_rx->stored_mpdu_num) {
1238                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1239
1240                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1241                      j = (j + 1) % tid_agg_rx->buf_size) {
1242                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1243                                 break;
1244                 }
1245
1246  set_release_timer:
1247
1248                 if (!tid_agg_rx->removed)
1249                         mod_timer(&tid_agg_rx->reorder_timer,
1250                                   tid_agg_rx->reorder_time[j] + 1 +
1251                                   HT_RX_REORDER_BUF_TIMEOUT);
1252         } else {
1253                 del_timer(&tid_agg_rx->reorder_timer);
1254         }
1255 }
1256
1257 /*
1258  * As this function belongs to the RX path it must be under
1259  * rcu_read_lock protection. It returns false if the frame
1260  * can be processed immediately, true if it was consumed.
1261  */
1262 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1263                                              struct tid_ampdu_rx *tid_agg_rx,
1264                                              struct sk_buff *skb,
1265                                              struct sk_buff_head *frames)
1266 {
1267         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1268         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1269         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1270         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1271         u16 head_seq_num, buf_size;
1272         int index;
1273         bool ret = true;
1274
1275         spin_lock(&tid_agg_rx->reorder_lock);
1276
1277         /*
1278          * Offloaded BA sessions have no known starting sequence number so pick
1279          * one from first Rxed frame for this tid after BA was started.
1280          */
1281         if (unlikely(tid_agg_rx->auto_seq)) {
1282                 tid_agg_rx->auto_seq = false;
1283                 tid_agg_rx->ssn = mpdu_seq_num;
1284                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1285         }
1286
1287         buf_size = tid_agg_rx->buf_size;
1288         head_seq_num = tid_agg_rx->head_seq_num;
1289
1290         /*
1291          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1292          * be reordered.
1293          */
1294         if (unlikely(!tid_agg_rx->started)) {
1295                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1296                         ret = false;
1297                         goto out;
1298                 }
1299                 tid_agg_rx->started = true;
1300         }
1301
1302         /* frame with out of date sequence number */
1303         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1304                 dev_kfree_skb(skb);
1305                 goto out;
1306         }
1307
1308         /*
1309          * If frame the sequence number exceeds our buffering window
1310          * size release some previous frames to make room for this one.
1311          */
1312         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1313                 head_seq_num = ieee80211_sn_inc(
1314                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1315                 /* release stored frames up to new head to stack */
1316                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1317                                                  head_seq_num, frames);
1318         }
1319
1320         /* Now the new frame is always in the range of the reordering buffer */
1321
1322         index = mpdu_seq_num % tid_agg_rx->buf_size;
1323
1324         /* check if we already stored this frame */
1325         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1326                 dev_kfree_skb(skb);
1327                 goto out;
1328         }
1329
1330         /*
1331          * If the current MPDU is in the right order and nothing else
1332          * is stored we can process it directly, no need to buffer it.
1333          * If it is first but there's something stored, we may be able
1334          * to release frames after this one.
1335          */
1336         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1337             tid_agg_rx->stored_mpdu_num == 0) {
1338                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1339                         tid_agg_rx->head_seq_num =
1340                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1341                 ret = false;
1342                 goto out;
1343         }
1344
1345         /* put the frame in the reordering buffer */
1346         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1347         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1348                 tid_agg_rx->reorder_time[index] = jiffies;
1349                 tid_agg_rx->stored_mpdu_num++;
1350                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1351         }
1352
1353  out:
1354         spin_unlock(&tid_agg_rx->reorder_lock);
1355         return ret;
1356 }
1357
1358 /*
1359  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1360  * true if the MPDU was buffered, false if it should be processed.
1361  */
1362 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1363                                        struct sk_buff_head *frames)
1364 {
1365         struct sk_buff *skb = rx->skb;
1366         struct ieee80211_local *local = rx->local;
1367         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1368         struct sta_info *sta = rx->sta;
1369         struct tid_ampdu_rx *tid_agg_rx;
1370         u16 sc;
1371         u8 tid, ack_policy;
1372
1373         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1374             is_multicast_ether_addr(hdr->addr1))
1375                 goto dont_reorder;
1376
1377         /*
1378          * filter the QoS data rx stream according to
1379          * STA/TID and check if this STA/TID is on aggregation
1380          */
1381
1382         if (!sta)
1383                 goto dont_reorder;
1384
1385         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1386                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1387         tid = ieee80211_get_tid(hdr);
1388
1389         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1390         if (!tid_agg_rx) {
1391                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1392                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1393                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1394                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1395                                              WLAN_BACK_RECIPIENT,
1396                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1397                 goto dont_reorder;
1398         }
1399
1400         /* qos null data frames are excluded */
1401         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1402                 goto dont_reorder;
1403
1404         /* not part of a BA session */
1405         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1406             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1407                 goto dont_reorder;
1408
1409         /* new, potentially un-ordered, ampdu frame - process it */
1410
1411         /* reset session timer */
1412         if (tid_agg_rx->timeout)
1413                 tid_agg_rx->last_rx = jiffies;
1414
1415         /* if this mpdu is fragmented - terminate rx aggregation session */
1416         sc = le16_to_cpu(hdr->seq_ctrl);
1417         if (sc & IEEE80211_SCTL_FRAG) {
1418                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1419                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1420                 return;
1421         }
1422
1423         /*
1424          * No locking needed -- we will only ever process one
1425          * RX packet at a time, and thus own tid_agg_rx. All
1426          * other code manipulating it needs to (and does) make
1427          * sure that we cannot get to it any more before doing
1428          * anything with it.
1429          */
1430         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1431                                              frames))
1432                 return;
1433
1434  dont_reorder:
1435         __skb_queue_tail(frames, skb);
1436 }
1437
1438 static ieee80211_rx_result debug_noinline
1439 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1440 {
1441         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1442         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1443
1444         if (status->flag & RX_FLAG_DUP_VALIDATED)
1445                 return RX_CONTINUE;
1446
1447         /*
1448          * Drop duplicate 802.11 retransmissions
1449          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1450          */
1451
1452         if (rx->skb->len < 24)
1453                 return RX_CONTINUE;
1454
1455         if (ieee80211_is_ctl(hdr->frame_control) ||
1456             ieee80211_is_nullfunc(hdr->frame_control) ||
1457             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1458             is_multicast_ether_addr(hdr->addr1))
1459                 return RX_CONTINUE;
1460
1461         if (!rx->sta)
1462                 return RX_CONTINUE;
1463
1464         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1465                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1466                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1467                 rx->sta->rx_stats.num_duplicates++;
1468                 return RX_DROP_UNUSABLE;
1469         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1470                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1471         }
1472
1473         return RX_CONTINUE;
1474 }
1475
1476 static ieee80211_rx_result debug_noinline
1477 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1478 {
1479         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1480
1481         /* Drop disallowed frame classes based on STA auth/assoc state;
1482          * IEEE 802.11, Chap 5.5.
1483          *
1484          * mac80211 filters only based on association state, i.e. it drops
1485          * Class 3 frames from not associated stations. hostapd sends
1486          * deauth/disassoc frames when needed. In addition, hostapd is
1487          * responsible for filtering on both auth and assoc states.
1488          */
1489
1490         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1491                 return ieee80211_rx_mesh_check(rx);
1492
1493         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1494                       ieee80211_is_pspoll(hdr->frame_control)) &&
1495                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1496                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1497                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1498                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1499                 /*
1500                  * accept port control frames from the AP even when it's not
1501                  * yet marked ASSOC to prevent a race where we don't set the
1502                  * assoc bit quickly enough before it sends the first frame
1503                  */
1504                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1505                     ieee80211_is_data_present(hdr->frame_control)) {
1506                         unsigned int hdrlen;
1507                         __be16 ethertype;
1508
1509                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1510
1511                         if (rx->skb->len < hdrlen + 8)
1512                                 return RX_DROP_MONITOR;
1513
1514                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1515                         if (ethertype == rx->sdata->control_port_protocol)
1516                                 return RX_CONTINUE;
1517                 }
1518
1519                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1520                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1521                                                hdr->addr2,
1522                                                GFP_ATOMIC))
1523                         return RX_DROP_UNUSABLE;
1524
1525                 return RX_DROP_MONITOR;
1526         }
1527
1528         return RX_CONTINUE;
1529 }
1530
1531
1532 static ieee80211_rx_result debug_noinline
1533 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1534 {
1535         struct ieee80211_local *local;
1536         struct ieee80211_hdr *hdr;
1537         struct sk_buff *skb;
1538
1539         local = rx->local;
1540         skb = rx->skb;
1541         hdr = (struct ieee80211_hdr *) skb->data;
1542
1543         if (!local->pspolling)
1544                 return RX_CONTINUE;
1545
1546         if (!ieee80211_has_fromds(hdr->frame_control))
1547                 /* this is not from AP */
1548                 return RX_CONTINUE;
1549
1550         if (!ieee80211_is_data(hdr->frame_control))
1551                 return RX_CONTINUE;
1552
1553         if (!ieee80211_has_moredata(hdr->frame_control)) {
1554                 /* AP has no more frames buffered for us */
1555                 local->pspolling = false;
1556                 return RX_CONTINUE;
1557         }
1558
1559         /* more data bit is set, let's request a new frame from the AP */
1560         ieee80211_send_pspoll(local, rx->sdata);
1561
1562         return RX_CONTINUE;
1563 }
1564
1565 static void sta_ps_start(struct sta_info *sta)
1566 {
1567         struct ieee80211_sub_if_data *sdata = sta->sdata;
1568         struct ieee80211_local *local = sdata->local;
1569         struct ps_data *ps;
1570         int tid;
1571
1572         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1573             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1574                 ps = &sdata->bss->ps;
1575         else
1576                 return;
1577
1578         atomic_inc(&ps->num_sta_ps);
1579         set_sta_flag(sta, WLAN_STA_PS_STA);
1580         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1581                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1582         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1583                sta->sta.addr, sta->sta.aid);
1584
1585         ieee80211_clear_fast_xmit(sta);
1586
1587         if (!sta->sta.txq[0])
1588                 return;
1589
1590         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1591                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1592                 struct txq_info *txqi = to_txq_info(txq);
1593
1594                 spin_lock(&local->active_txq_lock[txq->ac]);
1595                 if (!list_empty(&txqi->schedule_order))
1596                         list_del_init(&txqi->schedule_order);
1597                 spin_unlock(&local->active_txq_lock[txq->ac]);
1598
1599                 if (txq_has_queue(txq))
1600                         set_bit(tid, &sta->txq_buffered_tids);
1601                 else
1602                         clear_bit(tid, &sta->txq_buffered_tids);
1603         }
1604 }
1605
1606 static void sta_ps_end(struct sta_info *sta)
1607 {
1608         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1609                sta->sta.addr, sta->sta.aid);
1610
1611         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1612                 /*
1613                  * Clear the flag only if the other one is still set
1614                  * so that the TX path won't start TX'ing new frames
1615                  * directly ... In the case that the driver flag isn't
1616                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1617                  */
1618                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1619                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1620                        sta->sta.addr, sta->sta.aid);
1621                 return;
1622         }
1623
1624         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1625         clear_sta_flag(sta, WLAN_STA_PS_STA);
1626         ieee80211_sta_ps_deliver_wakeup(sta);
1627 }
1628
1629 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1630 {
1631         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1632         bool in_ps;
1633
1634         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1635
1636         /* Don't let the same PS state be set twice */
1637         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1638         if ((start && in_ps) || (!start && !in_ps))
1639                 return -EINVAL;
1640
1641         if (start)
1642                 sta_ps_start(sta);
1643         else
1644                 sta_ps_end(sta);
1645
1646         return 0;
1647 }
1648 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1649
1650 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1651 {
1652         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1653
1654         if (test_sta_flag(sta, WLAN_STA_SP))
1655                 return;
1656
1657         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1658                 ieee80211_sta_ps_deliver_poll_response(sta);
1659         else
1660                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1661 }
1662 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1663
1664 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1665 {
1666         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1667         int ac = ieee80211_ac_from_tid(tid);
1668
1669         /*
1670          * If this AC is not trigger-enabled do nothing unless the
1671          * driver is calling us after it already checked.
1672          *
1673          * NB: This could/should check a separate bitmap of trigger-
1674          * enabled queues, but for now we only implement uAPSD w/o
1675          * TSPEC changes to the ACs, so they're always the same.
1676          */
1677         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1678             tid != IEEE80211_NUM_TIDS)
1679                 return;
1680
1681         /* if we are in a service period, do nothing */
1682         if (test_sta_flag(sta, WLAN_STA_SP))
1683                 return;
1684
1685         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1686                 ieee80211_sta_ps_deliver_uapsd(sta);
1687         else
1688                 set_sta_flag(sta, WLAN_STA_UAPSD);
1689 }
1690 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1691
1692 static ieee80211_rx_result debug_noinline
1693 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1694 {
1695         struct ieee80211_sub_if_data *sdata = rx->sdata;
1696         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1697         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1698
1699         if (!rx->sta)
1700                 return RX_CONTINUE;
1701
1702         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1703             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1704                 return RX_CONTINUE;
1705
1706         /*
1707          * The device handles station powersave, so don't do anything about
1708          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1709          * it to mac80211 since they're handled.)
1710          */
1711         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1712                 return RX_CONTINUE;
1713
1714         /*
1715          * Don't do anything if the station isn't already asleep. In
1716          * the uAPSD case, the station will probably be marked asleep,
1717          * in the PS-Poll case the station must be confused ...
1718          */
1719         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1720                 return RX_CONTINUE;
1721
1722         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1723                 ieee80211_sta_pspoll(&rx->sta->sta);
1724
1725                 /* Free PS Poll skb here instead of returning RX_DROP that would
1726                  * count as an dropped frame. */
1727                 dev_kfree_skb(rx->skb);
1728
1729                 return RX_QUEUED;
1730         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1731                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1732                    ieee80211_has_pm(hdr->frame_control) &&
1733                    (ieee80211_is_data_qos(hdr->frame_control) ||
1734                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1735                 u8 tid = ieee80211_get_tid(hdr);
1736
1737                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1738         }
1739
1740         return RX_CONTINUE;
1741 }
1742
1743 static ieee80211_rx_result debug_noinline
1744 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1745 {
1746         struct sta_info *sta = rx->sta;
1747         struct sk_buff *skb = rx->skb;
1748         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1749         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750         int i;
1751
1752         if (!sta)
1753                 return RX_CONTINUE;
1754
1755         /*
1756          * Update last_rx only for IBSS packets which are for the current
1757          * BSSID and for station already AUTHORIZED to avoid keeping the
1758          * current IBSS network alive in cases where other STAs start
1759          * using different BSSID. This will also give the station another
1760          * chance to restart the authentication/authorization in case
1761          * something went wrong the first time.
1762          */
1763         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1764                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1765                                                 NL80211_IFTYPE_ADHOC);
1766                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1767                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1768                         sta->rx_stats.last_rx = jiffies;
1769                         if (ieee80211_is_data(hdr->frame_control) &&
1770                             !is_multicast_ether_addr(hdr->addr1))
1771                                 sta->rx_stats.last_rate =
1772                                         sta_stats_encode_rate(status);
1773                 }
1774         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1775                 sta->rx_stats.last_rx = jiffies;
1776         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1777                 /*
1778                  * Mesh beacons will update last_rx when if they are found to
1779                  * match the current local configuration when processed.
1780                  */
1781                 sta->rx_stats.last_rx = jiffies;
1782                 if (ieee80211_is_data(hdr->frame_control))
1783                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1784         }
1785
1786         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1787                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1788
1789         sta->rx_stats.fragments++;
1790
1791         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1792         sta->rx_stats.bytes += rx->skb->len;
1793         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1794
1795         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1796                 sta->rx_stats.last_signal = status->signal;
1797                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1798         }
1799
1800         if (status->chains) {
1801                 sta->rx_stats.chains = status->chains;
1802                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1803                         int signal = status->chain_signal[i];
1804
1805                         if (!(status->chains & BIT(i)))
1806                                 continue;
1807
1808                         sta->rx_stats.chain_signal_last[i] = signal;
1809                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1810                                         -signal);
1811                 }
1812         }
1813
1814         /*
1815          * Change STA power saving mode only at the end of a frame
1816          * exchange sequence, and only for a data or management
1817          * frame as specified in IEEE 802.11-2016 11.2.3.2
1818          */
1819         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1820             !ieee80211_has_morefrags(hdr->frame_control) &&
1821             !is_multicast_ether_addr(hdr->addr1) &&
1822             (ieee80211_is_mgmt(hdr->frame_control) ||
1823              ieee80211_is_data(hdr->frame_control)) &&
1824             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1825             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1826              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1827                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1828                         if (!ieee80211_has_pm(hdr->frame_control))
1829                                 sta_ps_end(sta);
1830                 } else {
1831                         if (ieee80211_has_pm(hdr->frame_control))
1832                                 sta_ps_start(sta);
1833                 }
1834         }
1835
1836         /* mesh power save support */
1837         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1838                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1839
1840         /*
1841          * Drop (qos-)data::nullfunc frames silently, since they
1842          * are used only to control station power saving mode.
1843          */
1844         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1845             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1846                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1847
1848                 /*
1849                  * If we receive a 4-addr nullfunc frame from a STA
1850                  * that was not moved to a 4-addr STA vlan yet send
1851                  * the event to userspace and for older hostapd drop
1852                  * the frame to the monitor interface.
1853                  */
1854                 if (ieee80211_has_a4(hdr->frame_control) &&
1855                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1856                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1857                       !rx->sdata->u.vlan.sta))) {
1858                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1859                                 cfg80211_rx_unexpected_4addr_frame(
1860                                         rx->sdata->dev, sta->sta.addr,
1861                                         GFP_ATOMIC);
1862                         return RX_DROP_MONITOR;
1863                 }
1864                 /*
1865                  * Update counter and free packet here to avoid
1866                  * counting this as a dropped packed.
1867                  */
1868                 sta->rx_stats.packets++;
1869                 dev_kfree_skb(rx->skb);
1870                 return RX_QUEUED;
1871         }
1872
1873         return RX_CONTINUE;
1874 } /* ieee80211_rx_h_sta_process */
1875
1876 static ieee80211_rx_result debug_noinline
1877 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1878 {
1879         struct sk_buff *skb = rx->skb;
1880         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1881         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1882         int keyidx;
1883         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1884         struct ieee80211_key *sta_ptk = NULL;
1885         struct ieee80211_key *ptk_idx = NULL;
1886         int mmie_keyidx = -1;
1887         __le16 fc;
1888         const struct ieee80211_cipher_scheme *cs = NULL;
1889
1890         /*
1891          * Key selection 101
1892          *
1893          * There are four types of keys:
1894          *  - GTK (group keys)
1895          *  - IGTK (group keys for management frames)
1896          *  - PTK (pairwise keys)
1897          *  - STK (station-to-station pairwise keys)
1898          *
1899          * When selecting a key, we have to distinguish between multicast
1900          * (including broadcast) and unicast frames, the latter can only
1901          * use PTKs and STKs while the former always use GTKs and IGTKs.
1902          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1903          * unicast frames can also use key indices like GTKs. Hence, if we
1904          * don't have a PTK/STK we check the key index for a WEP key.
1905          *
1906          * Note that in a regular BSS, multicast frames are sent by the
1907          * AP only, associated stations unicast the frame to the AP first
1908          * which then multicasts it on their behalf.
1909          *
1910          * There is also a slight problem in IBSS mode: GTKs are negotiated
1911          * with each station, that is something we don't currently handle.
1912          * The spec seems to expect that one negotiates the same key with
1913          * every station but there's no such requirement; VLANs could be
1914          * possible.
1915          */
1916
1917         /* start without a key */
1918         rx->key = NULL;
1919         fc = hdr->frame_control;
1920
1921         if (rx->sta) {
1922                 int keyid = rx->sta->ptk_idx;
1923                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1924
1925                 if (ieee80211_has_protected(fc)) {
1926                         cs = rx->sta->cipher_scheme;
1927                         keyid = ieee80211_get_keyid(rx->skb, cs);
1928
1929                         if (unlikely(keyid < 0))
1930                                 return RX_DROP_UNUSABLE;
1931
1932                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1933                 }
1934         }
1935
1936         if (!ieee80211_has_protected(fc))
1937                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1938
1939         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1940                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1941                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1942                     (status->flag & RX_FLAG_IV_STRIPPED))
1943                         return RX_CONTINUE;
1944                 /* Skip decryption if the frame is not protected. */
1945                 if (!ieee80211_has_protected(fc))
1946                         return RX_CONTINUE;
1947         } else if (mmie_keyidx >= 0) {
1948                 /* Broadcast/multicast robust management frame / BIP */
1949                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1950                     (status->flag & RX_FLAG_IV_STRIPPED))
1951                         return RX_CONTINUE;
1952
1953                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1954                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1955                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1956                 if (rx->sta) {
1957                         if (ieee80211_is_group_privacy_action(skb) &&
1958                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1959                                 return RX_DROP_MONITOR;
1960
1961                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1962                 }
1963                 if (!rx->key)
1964                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1965         } else if (!ieee80211_has_protected(fc)) {
1966                 /*
1967                  * The frame was not protected, so skip decryption. However, we
1968                  * need to set rx->key if there is a key that could have been
1969                  * used so that the frame may be dropped if encryption would
1970                  * have been expected.
1971                  */
1972                 struct ieee80211_key *key = NULL;
1973                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1974                 int i;
1975
1976                 if (ieee80211_is_mgmt(fc) &&
1977                     is_multicast_ether_addr(hdr->addr1) &&
1978                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1979                         rx->key = key;
1980                 else {
1981                         if (rx->sta) {
1982                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1983                                         key = rcu_dereference(rx->sta->gtk[i]);
1984                                         if (key)
1985                                                 break;
1986                                 }
1987                         }
1988                         if (!key) {
1989                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1990                                         key = rcu_dereference(sdata->keys[i]);
1991                                         if (key)
1992                                                 break;
1993                                 }
1994                         }
1995                         if (key)
1996                                 rx->key = key;
1997                 }
1998                 return RX_CONTINUE;
1999         } else {
2000                 /*
2001                  * The device doesn't give us the IV so we won't be
2002                  * able to look up the key. That's ok though, we
2003                  * don't need to decrypt the frame, we just won't
2004                  * be able to keep statistics accurate.
2005                  * Except for key threshold notifications, should
2006                  * we somehow allow the driver to tell us which key
2007                  * the hardware used if this flag is set?
2008                  */
2009                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2010                     (status->flag & RX_FLAG_IV_STRIPPED))
2011                         return RX_CONTINUE;
2012
2013                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2014
2015                 if (unlikely(keyidx < 0))
2016                         return RX_DROP_UNUSABLE;
2017
2018                 /* check per-station GTK first, if multicast packet */
2019                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2020                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2021
2022                 /* if not found, try default key */
2023                 if (!rx->key) {
2024                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2025
2026                         /*
2027                          * RSNA-protected unicast frames should always be
2028                          * sent with pairwise or station-to-station keys,
2029                          * but for WEP we allow using a key index as well.
2030                          */
2031                         if (rx->key &&
2032                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2033                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2034                             !is_multicast_ether_addr(hdr->addr1))
2035                                 rx->key = NULL;
2036                 }
2037         }
2038
2039         if (rx->key) {
2040                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2041                         return RX_DROP_MONITOR;
2042
2043                 /* TODO: add threshold stuff again */
2044         } else {
2045                 return RX_DROP_MONITOR;
2046         }
2047
2048         switch (rx->key->conf.cipher) {
2049         case WLAN_CIPHER_SUITE_WEP40:
2050         case WLAN_CIPHER_SUITE_WEP104:
2051                 result = ieee80211_crypto_wep_decrypt(rx);
2052                 break;
2053         case WLAN_CIPHER_SUITE_TKIP:
2054                 result = ieee80211_crypto_tkip_decrypt(rx);
2055                 break;
2056         case WLAN_CIPHER_SUITE_CCMP:
2057                 result = ieee80211_crypto_ccmp_decrypt(
2058                         rx, IEEE80211_CCMP_MIC_LEN);
2059                 break;
2060         case WLAN_CIPHER_SUITE_CCMP_256:
2061                 result = ieee80211_crypto_ccmp_decrypt(
2062                         rx, IEEE80211_CCMP_256_MIC_LEN);
2063                 break;
2064         case WLAN_CIPHER_SUITE_AES_CMAC:
2065                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2066                 break;
2067         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2068                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2069                 break;
2070         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2071         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2072                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2073                 break;
2074         case WLAN_CIPHER_SUITE_GCMP:
2075         case WLAN_CIPHER_SUITE_GCMP_256:
2076                 result = ieee80211_crypto_gcmp_decrypt(rx);
2077                 break;
2078         default:
2079                 result = ieee80211_crypto_hw_decrypt(rx);
2080         }
2081
2082         /* the hdr variable is invalid after the decrypt handlers */
2083
2084         /* either the frame has been decrypted or will be dropped */
2085         status->flag |= RX_FLAG_DECRYPTED;
2086
2087         return result;
2088 }
2089
2090 static inline struct ieee80211_fragment_entry *
2091 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2092                          unsigned int frag, unsigned int seq, int rx_queue,
2093                          struct sk_buff **skb)
2094 {
2095         struct ieee80211_fragment_entry *entry;
2096
2097         entry = &sdata->fragments[sdata->fragment_next++];
2098         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2099                 sdata->fragment_next = 0;
2100
2101         if (!skb_queue_empty(&entry->skb_list))
2102                 __skb_queue_purge(&entry->skb_list);
2103
2104         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2105         *skb = NULL;
2106         entry->first_frag_time = jiffies;
2107         entry->seq = seq;
2108         entry->rx_queue = rx_queue;
2109         entry->last_frag = frag;
2110         entry->check_sequential_pn = false;
2111         entry->extra_len = 0;
2112
2113         return entry;
2114 }
2115
2116 static inline struct ieee80211_fragment_entry *
2117 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2118                           unsigned int frag, unsigned int seq,
2119                           int rx_queue, struct ieee80211_hdr *hdr)
2120 {
2121         struct ieee80211_fragment_entry *entry;
2122         int i, idx;
2123
2124         idx = sdata->fragment_next;
2125         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2126                 struct ieee80211_hdr *f_hdr;
2127                 struct sk_buff *f_skb;
2128
2129                 idx--;
2130                 if (idx < 0)
2131                         idx = IEEE80211_FRAGMENT_MAX - 1;
2132
2133                 entry = &sdata->fragments[idx];
2134                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2135                     entry->rx_queue != rx_queue ||
2136                     entry->last_frag + 1 != frag)
2137                         continue;
2138
2139                 f_skb = __skb_peek(&entry->skb_list);
2140                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2141
2142                 /*
2143                  * Check ftype and addresses are equal, else check next fragment
2144                  */
2145                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2146                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2147                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2148                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2149                         continue;
2150
2151                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2152                         __skb_queue_purge(&entry->skb_list);
2153                         continue;
2154                 }
2155                 return entry;
2156         }
2157
2158         return NULL;
2159 }
2160
2161 static ieee80211_rx_result debug_noinline
2162 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2163 {
2164         struct ieee80211_hdr *hdr;
2165         u16 sc;
2166         __le16 fc;
2167         unsigned int frag, seq;
2168         struct ieee80211_fragment_entry *entry;
2169         struct sk_buff *skb;
2170
2171         hdr = (struct ieee80211_hdr *)rx->skb->data;
2172         fc = hdr->frame_control;
2173
2174         if (ieee80211_is_ctl(fc))
2175                 return RX_CONTINUE;
2176
2177         sc = le16_to_cpu(hdr->seq_ctrl);
2178         frag = sc & IEEE80211_SCTL_FRAG;
2179
2180         if (is_multicast_ether_addr(hdr->addr1)) {
2181                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2182                 goto out_no_led;
2183         }
2184
2185         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2186                 goto out;
2187
2188         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2189
2190         if (skb_linearize(rx->skb))
2191                 return RX_DROP_UNUSABLE;
2192
2193         /*
2194          *  skb_linearize() might change the skb->data and
2195          *  previously cached variables (in this case, hdr) need to
2196          *  be refreshed with the new data.
2197          */
2198         hdr = (struct ieee80211_hdr *)rx->skb->data;
2199         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2200
2201         if (frag == 0) {
2202                 /* This is the first fragment of a new frame. */
2203                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2204                                                  rx->seqno_idx, &(rx->skb));
2205                 if (rx->key &&
2206                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2207                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2208                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2209                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2210                     ieee80211_has_protected(fc)) {
2211                         int queue = rx->security_idx;
2212
2213                         /* Store CCMP/GCMP PN so that we can verify that the
2214                          * next fragment has a sequential PN value.
2215                          */
2216                         entry->check_sequential_pn = true;
2217                         memcpy(entry->last_pn,
2218                                rx->key->u.ccmp.rx_pn[queue],
2219                                IEEE80211_CCMP_PN_LEN);
2220                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2221                                               u.ccmp.rx_pn) !=
2222                                      offsetof(struct ieee80211_key,
2223                                               u.gcmp.rx_pn));
2224                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2225                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2226                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2227                                      IEEE80211_GCMP_PN_LEN);
2228                 }
2229                 return RX_QUEUED;
2230         }
2231
2232         /* This is a fragment for a frame that should already be pending in
2233          * fragment cache. Add this fragment to the end of the pending entry.
2234          */
2235         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2236                                           rx->seqno_idx, hdr);
2237         if (!entry) {
2238                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2239                 return RX_DROP_MONITOR;
2240         }
2241
2242         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2243          *  MPDU PN values are not incrementing in steps of 1."
2244          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2245          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2246          */
2247         if (entry->check_sequential_pn) {
2248                 int i;
2249                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2250                 int queue;
2251
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                         return RX_DROP_UNUSABLE;
2258                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2259                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2260                         pn[i]++;
2261                         if (pn[i])
2262                                 break;
2263                 }
2264                 queue = rx->security_idx;
2265                 rpn = rx->key->u.ccmp.rx_pn[queue];
2266                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2267                         return RX_DROP_UNUSABLE;
2268                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2269         }
2270
2271         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2272         __skb_queue_tail(&entry->skb_list, rx->skb);
2273         entry->last_frag = frag;
2274         entry->extra_len += rx->skb->len;
2275         if (ieee80211_has_morefrags(fc)) {
2276                 rx->skb = NULL;
2277                 return RX_QUEUED;
2278         }
2279
2280         rx->skb = __skb_dequeue(&entry->skb_list);
2281         if (skb_tailroom(rx->skb) < entry->extra_len) {
2282                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2283                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2284                                               GFP_ATOMIC))) {
2285                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2286                         __skb_queue_purge(&entry->skb_list);
2287                         return RX_DROP_UNUSABLE;
2288                 }
2289         }
2290         while ((skb = __skb_dequeue(&entry->skb_list))) {
2291                 skb_put_data(rx->skb, skb->data, skb->len);
2292                 dev_kfree_skb(skb);
2293         }
2294
2295  out:
2296         ieee80211_led_rx(rx->local);
2297  out_no_led:
2298         if (rx->sta)
2299                 rx->sta->rx_stats.packets++;
2300         return RX_CONTINUE;
2301 }
2302
2303 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2304 {
2305         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2306                 return -EACCES;
2307
2308         return 0;
2309 }
2310
2311 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2312 {
2313         struct sk_buff *skb = rx->skb;
2314         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2315
2316         /*
2317          * Pass through unencrypted frames if the hardware has
2318          * decrypted them already.
2319          */
2320         if (status->flag & RX_FLAG_DECRYPTED)
2321                 return 0;
2322
2323         /* Drop unencrypted frames if key is set. */
2324         if (unlikely(!ieee80211_has_protected(fc) &&
2325                      !ieee80211_is_nullfunc(fc) &&
2326                      ieee80211_is_data(fc) && rx->key))
2327                 return -EACCES;
2328
2329         return 0;
2330 }
2331
2332 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2333 {
2334         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2335         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2336         __le16 fc = hdr->frame_control;
2337
2338         /*
2339          * Pass through unencrypted frames if the hardware has
2340          * decrypted them already.
2341          */
2342         if (status->flag & RX_FLAG_DECRYPTED)
2343                 return 0;
2344
2345         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2346                 if (unlikely(!ieee80211_has_protected(fc) &&
2347                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2348                              rx->key)) {
2349                         if (ieee80211_is_deauth(fc) ||
2350                             ieee80211_is_disassoc(fc))
2351                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2352                                                              rx->skb->data,
2353                                                              rx->skb->len);
2354                         return -EACCES;
2355                 }
2356                 /* BIP does not use Protected field, so need to check MMIE */
2357                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2358                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2359                         if (ieee80211_is_deauth(fc) ||
2360                             ieee80211_is_disassoc(fc))
2361                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2362                                                              rx->skb->data,
2363                                                              rx->skb->len);
2364                         return -EACCES;
2365                 }
2366                 /*
2367                  * When using MFP, Action frames are not allowed prior to
2368                  * having configured keys.
2369                  */
2370                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2371                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2372                         return -EACCES;
2373         }
2374
2375         return 0;
2376 }
2377
2378 static int
2379 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2380 {
2381         struct ieee80211_sub_if_data *sdata = rx->sdata;
2382         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2383         bool check_port_control = false;
2384         struct ethhdr *ehdr;
2385         int ret;
2386
2387         *port_control = false;
2388         if (ieee80211_has_a4(hdr->frame_control) &&
2389             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2390                 return -1;
2391
2392         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2393             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2394
2395                 if (!sdata->u.mgd.use_4addr)
2396                         return -1;
2397                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2398                         check_port_control = true;
2399         }
2400
2401         if (is_multicast_ether_addr(hdr->addr1) &&
2402             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2403                 return -1;
2404
2405         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2406         if (ret < 0)
2407                 return ret;
2408
2409         ehdr = (struct ethhdr *) rx->skb->data;
2410         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2411                 *port_control = true;
2412         else if (check_port_control)
2413                 return -1;
2414
2415         return 0;
2416 }
2417
2418 /*
2419  * requires that rx->skb is a frame with ethernet header
2420  */
2421 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2422 {
2423         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2424                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2425         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2426
2427         /*
2428          * Allow EAPOL frames to us/the PAE group address regardless
2429          * of whether the frame was encrypted or not.
2430          */
2431         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2432             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2433              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2434                 return true;
2435
2436         if (ieee80211_802_1x_port_control(rx) ||
2437             ieee80211_drop_unencrypted(rx, fc))
2438                 return false;
2439
2440         return true;
2441 }
2442
2443 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2444                                                  struct ieee80211_rx_data *rx)
2445 {
2446         struct ieee80211_sub_if_data *sdata = rx->sdata;
2447         struct net_device *dev = sdata->dev;
2448
2449         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2450                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2451                      sdata->control_port_over_nl80211)) {
2452                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2453                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2454
2455                 cfg80211_rx_control_port(dev, skb, noencrypt);
2456                 dev_kfree_skb(skb);
2457         } else {
2458                 /* deliver to local stack */
2459                 if (rx->napi)
2460                         napi_gro_receive(rx->napi, skb);
2461                 else
2462                         netif_receive_skb(skb);
2463         }
2464 }
2465
2466 /*
2467  * requires that rx->skb is a frame with ethernet header
2468  */
2469 static void
2470 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2471 {
2472         struct ieee80211_sub_if_data *sdata = rx->sdata;
2473         struct net_device *dev = sdata->dev;
2474         struct sk_buff *skb, *xmit_skb;
2475         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2476         struct sta_info *dsta;
2477
2478         skb = rx->skb;
2479         xmit_skb = NULL;
2480
2481         ieee80211_rx_stats(dev, skb->len);
2482
2483         if (rx->sta) {
2484                 /* The seqno index has the same property as needed
2485                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2486                  * for non-QoS-data frames. Here we know it's a data
2487                  * frame, so count MSDUs.
2488                  */
2489                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2490                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2491                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2492         }
2493
2494         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2495              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2496             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2497             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2498                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2499                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2500                         /*
2501                          * send multicast frames both to higher layers in
2502                          * local net stack and back to the wireless medium
2503                          */
2504                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2505                         if (!xmit_skb)
2506                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2507                                                     dev->name);
2508                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2509                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2510                         dsta = sta_info_get(sdata, ehdr->h_dest);
2511                         if (dsta) {
2512                                 /*
2513                                  * The destination station is associated to
2514                                  * this AP (in this VLAN), so send the frame
2515                                  * directly to it and do not pass it to local
2516                                  * net stack.
2517                                  */
2518                                 xmit_skb = skb;
2519                                 skb = NULL;
2520                         }
2521                 }
2522         }
2523
2524 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2525         if (skb) {
2526                 /* 'align' will only take the values 0 or 2 here since all
2527                  * frames are required to be aligned to 2-byte boundaries
2528                  * when being passed to mac80211; the code here works just
2529                  * as well if that isn't true, but mac80211 assumes it can
2530                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2531                  */
2532                 int align;
2533
2534                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2535                 if (align) {
2536                         if (WARN_ON(skb_headroom(skb) < 3)) {
2537                                 dev_kfree_skb(skb);
2538                                 skb = NULL;
2539                         } else {
2540                                 u8 *data = skb->data;
2541                                 size_t len = skb_headlen(skb);
2542                                 skb->data -= align;
2543                                 memmove(skb->data, data, len);
2544                                 skb_set_tail_pointer(skb, len);
2545                         }
2546                 }
2547         }
2548 #endif
2549
2550         if (skb) {
2551                 skb->protocol = eth_type_trans(skb, dev);
2552                 memset(skb->cb, 0, sizeof(skb->cb));
2553
2554                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2555         }
2556
2557         if (xmit_skb) {
2558                 /*
2559                  * Send to wireless media and increase priority by 256 to
2560                  * keep the received priority instead of reclassifying
2561                  * the frame (see cfg80211_classify8021d).
2562                  */
2563                 xmit_skb->priority += 256;
2564                 xmit_skb->protocol = htons(ETH_P_802_3);
2565                 skb_reset_network_header(xmit_skb);
2566                 skb_reset_mac_header(xmit_skb);
2567                 dev_queue_xmit(xmit_skb);
2568         }
2569 }
2570
2571 static ieee80211_rx_result debug_noinline
2572 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2573 {
2574         struct net_device *dev = rx->sdata->dev;
2575         struct sk_buff *skb = rx->skb;
2576         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2577         __le16 fc = hdr->frame_control;
2578         struct sk_buff_head frame_list;
2579         struct ethhdr ethhdr;
2580         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2581
2582         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2583                 check_da = NULL;
2584                 check_sa = NULL;
2585         } else switch (rx->sdata->vif.type) {
2586                 case NL80211_IFTYPE_AP:
2587                 case NL80211_IFTYPE_AP_VLAN:
2588                         check_da = NULL;
2589                         break;
2590                 case NL80211_IFTYPE_STATION:
2591                         if (!rx->sta ||
2592                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2593                                 check_sa = NULL;
2594                         break;
2595                 case NL80211_IFTYPE_MESH_POINT:
2596                         check_sa = NULL;
2597                         break;
2598                 default:
2599                         break;
2600         }
2601
2602         skb->dev = dev;
2603         __skb_queue_head_init(&frame_list);
2604
2605         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2606                                           rx->sdata->vif.addr,
2607                                           rx->sdata->vif.type,
2608                                           data_offset))
2609                 return RX_DROP_UNUSABLE;
2610
2611         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2612                                  rx->sdata->vif.type,
2613                                  rx->local->hw.extra_tx_headroom,
2614                                  check_da, check_sa);
2615
2616         while (!skb_queue_empty(&frame_list)) {
2617                 rx->skb = __skb_dequeue(&frame_list);
2618
2619                 if (!ieee80211_frame_allowed(rx, fc)) {
2620                         dev_kfree_skb(rx->skb);
2621                         continue;
2622                 }
2623
2624                 ieee80211_deliver_skb(rx);
2625         }
2626
2627         return RX_QUEUED;
2628 }
2629
2630 static ieee80211_rx_result debug_noinline
2631 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2632 {
2633         struct sk_buff *skb = rx->skb;
2634         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2635         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2636         __le16 fc = hdr->frame_control;
2637
2638         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2639                 return RX_CONTINUE;
2640
2641         if (unlikely(!ieee80211_is_data(fc)))
2642                 return RX_CONTINUE;
2643
2644         if (unlikely(!ieee80211_is_data_present(fc)))
2645                 return RX_DROP_MONITOR;
2646
2647         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2648                 switch (rx->sdata->vif.type) {
2649                 case NL80211_IFTYPE_AP_VLAN:
2650                         if (!rx->sdata->u.vlan.sta)
2651                                 return RX_DROP_UNUSABLE;
2652                         break;
2653                 case NL80211_IFTYPE_STATION:
2654                         if (!rx->sdata->u.mgd.use_4addr)
2655                                 return RX_DROP_UNUSABLE;
2656                         break;
2657                 default:
2658                         return RX_DROP_UNUSABLE;
2659                 }
2660         }
2661
2662         if (is_multicast_ether_addr(hdr->addr1))
2663                 return RX_DROP_UNUSABLE;
2664
2665         return __ieee80211_rx_h_amsdu(rx, 0);
2666 }
2667
2668 #ifdef CONFIG_MAC80211_MESH
2669 static ieee80211_rx_result
2670 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2671 {
2672         struct ieee80211_hdr *fwd_hdr, *hdr;
2673         struct ieee80211_tx_info *info;
2674         struct ieee80211s_hdr *mesh_hdr;
2675         struct sk_buff *skb = rx->skb, *fwd_skb;
2676         struct ieee80211_local *local = rx->local;
2677         struct ieee80211_sub_if_data *sdata = rx->sdata;
2678         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2679         u16 ac, q, hdrlen;
2680         int tailroom = 0;
2681
2682         hdr = (struct ieee80211_hdr *) skb->data;
2683         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2684
2685         /* make sure fixed part of mesh header is there, also checks skb len */
2686         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2687                 return RX_DROP_MONITOR;
2688
2689         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2690
2691         /* make sure full mesh header is there, also checks skb len */
2692         if (!pskb_may_pull(rx->skb,
2693                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2694                 return RX_DROP_MONITOR;
2695
2696         /* reload pointers */
2697         hdr = (struct ieee80211_hdr *) skb->data;
2698         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2699
2700         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2701                 return RX_DROP_MONITOR;
2702
2703         /* frame is in RMC, don't forward */
2704         if (ieee80211_is_data(hdr->frame_control) &&
2705             is_multicast_ether_addr(hdr->addr1) &&
2706             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2707                 return RX_DROP_MONITOR;
2708
2709         if (!ieee80211_is_data(hdr->frame_control))
2710                 return RX_CONTINUE;
2711
2712         if (!mesh_hdr->ttl)
2713                 return RX_DROP_MONITOR;
2714
2715         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2716                 struct mesh_path *mppath;
2717                 char *proxied_addr;
2718                 char *mpp_addr;
2719
2720                 if (is_multicast_ether_addr(hdr->addr1)) {
2721                         mpp_addr = hdr->addr3;
2722                         proxied_addr = mesh_hdr->eaddr1;
2723                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2724                             MESH_FLAGS_AE_A5_A6) {
2725                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2726                         mpp_addr = hdr->addr4;
2727                         proxied_addr = mesh_hdr->eaddr2;
2728                 } else {
2729                         return RX_DROP_MONITOR;
2730                 }
2731
2732                 rcu_read_lock();
2733                 mppath = mpp_path_lookup(sdata, proxied_addr);
2734                 if (!mppath) {
2735                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2736                 } else {
2737                         spin_lock_bh(&mppath->state_lock);
2738                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2739                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2740                         mppath->exp_time = jiffies;
2741                         spin_unlock_bh(&mppath->state_lock);
2742                 }
2743                 rcu_read_unlock();
2744         }
2745
2746         /* Frame has reached destination.  Don't forward */
2747         if (!is_multicast_ether_addr(hdr->addr1) &&
2748             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2749                 return RX_CONTINUE;
2750
2751         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2752         q = sdata->vif.hw_queue[ac];
2753         if (ieee80211_queue_stopped(&local->hw, q)) {
2754                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2755                 return RX_DROP_MONITOR;
2756         }
2757         skb_set_queue_mapping(skb, q);
2758
2759         if (!--mesh_hdr->ttl) {
2760                 if (!is_multicast_ether_addr(hdr->addr1))
2761                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2762                                                      dropped_frames_ttl);
2763                 goto out;
2764         }
2765
2766         if (!ifmsh->mshcfg.dot11MeshForwarding)
2767                 goto out;
2768
2769         if (sdata->crypto_tx_tailroom_needed_cnt)
2770                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2771
2772         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2773                                        sdata->encrypt_headroom,
2774                                   tailroom, GFP_ATOMIC);
2775         if (!fwd_skb)
2776                 goto out;
2777
2778         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2779         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2780         info = IEEE80211_SKB_CB(fwd_skb);
2781         memset(info, 0, sizeof(*info));
2782         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2783         info->control.vif = &rx->sdata->vif;
2784         info->control.jiffies = jiffies;
2785         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2786                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2787                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2788                 /* update power mode indication when forwarding */
2789                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2790         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2791                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2792                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2793         } else {
2794                 /* unable to resolve next hop */
2795                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2796                                    fwd_hdr->addr3, 0,
2797                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2798                                    fwd_hdr->addr2);
2799                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2800                 kfree_skb(fwd_skb);
2801                 return RX_DROP_MONITOR;
2802         }
2803
2804         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2805         ieee80211_add_pending_skb(local, fwd_skb);
2806  out:
2807         if (is_multicast_ether_addr(hdr->addr1))
2808                 return RX_CONTINUE;
2809         return RX_DROP_MONITOR;
2810 }
2811 #endif
2812
2813 static ieee80211_rx_result debug_noinline
2814 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2815 {
2816         struct ieee80211_sub_if_data *sdata = rx->sdata;
2817         struct ieee80211_local *local = rx->local;
2818         struct net_device *dev = sdata->dev;
2819         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2820         __le16 fc = hdr->frame_control;
2821         bool port_control;
2822         int err;
2823
2824         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2825                 return RX_CONTINUE;
2826
2827         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2828                 return RX_DROP_MONITOR;
2829
2830         /*
2831          * Send unexpected-4addr-frame event to hostapd. For older versions,
2832          * also drop the frame to cooked monitor interfaces.
2833          */
2834         if (ieee80211_has_a4(hdr->frame_control) &&
2835             sdata->vif.type == NL80211_IFTYPE_AP) {
2836                 if (rx->sta &&
2837                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2838                         cfg80211_rx_unexpected_4addr_frame(
2839                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2840                 return RX_DROP_MONITOR;
2841         }
2842
2843         err = __ieee80211_data_to_8023(rx, &port_control);
2844         if (unlikely(err))
2845                 return RX_DROP_UNUSABLE;
2846
2847         if (!ieee80211_frame_allowed(rx, fc))
2848                 return RX_DROP_MONITOR;
2849
2850         /* directly handle TDLS channel switch requests/responses */
2851         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2852                                                 cpu_to_be16(ETH_P_TDLS))) {
2853                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2854
2855                 if (pskb_may_pull(rx->skb,
2856                                   offsetof(struct ieee80211_tdls_data, u)) &&
2857                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2858                     tf->category == WLAN_CATEGORY_TDLS &&
2859                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2860                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2861                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2862                         schedule_work(&local->tdls_chsw_work);
2863                         if (rx->sta)
2864                                 rx->sta->rx_stats.packets++;
2865
2866                         return RX_QUEUED;
2867                 }
2868         }
2869
2870         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2871             unlikely(port_control) && sdata->bss) {
2872                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2873                                      u.ap);
2874                 dev = sdata->dev;
2875                 rx->sdata = sdata;
2876         }
2877
2878         rx->skb->dev = dev;
2879
2880         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2881             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2882             !is_multicast_ether_addr(
2883                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2884             (!local->scanning &&
2885              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2886                 mod_timer(&local->dynamic_ps_timer, jiffies +
2887                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2888
2889         ieee80211_deliver_skb(rx);
2890
2891         return RX_QUEUED;
2892 }
2893
2894 static ieee80211_rx_result debug_noinline
2895 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2896 {
2897         struct sk_buff *skb = rx->skb;
2898         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2899         struct tid_ampdu_rx *tid_agg_rx;
2900         u16 start_seq_num;
2901         u16 tid;
2902
2903         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2904                 return RX_CONTINUE;
2905
2906         if (ieee80211_is_back_req(bar->frame_control)) {
2907                 struct {
2908                         __le16 control, start_seq_num;
2909                 } __packed bar_data;
2910                 struct ieee80211_event event = {
2911                         .type = BAR_RX_EVENT,
2912                 };
2913
2914                 if (!rx->sta)
2915                         return RX_DROP_MONITOR;
2916
2917                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2918                                   &bar_data, sizeof(bar_data)))
2919                         return RX_DROP_MONITOR;
2920
2921                 tid = le16_to_cpu(bar_data.control) >> 12;
2922
2923                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2924                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2925                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2926                                              WLAN_BACK_RECIPIENT,
2927                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2928
2929                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2930                 if (!tid_agg_rx)
2931                         return RX_DROP_MONITOR;
2932
2933                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2934                 event.u.ba.tid = tid;
2935                 event.u.ba.ssn = start_seq_num;
2936                 event.u.ba.sta = &rx->sta->sta;
2937
2938                 /* reset session timer */
2939                 if (tid_agg_rx->timeout)
2940                         mod_timer(&tid_agg_rx->session_timer,
2941                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2942
2943                 spin_lock(&tid_agg_rx->reorder_lock);
2944                 /* release stored frames up to start of BAR */
2945                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2946                                                  start_seq_num, frames);
2947                 spin_unlock(&tid_agg_rx->reorder_lock);
2948
2949                 drv_event_callback(rx->local, rx->sdata, &event);
2950
2951                 kfree_skb(skb);
2952                 return RX_QUEUED;
2953         }
2954
2955         /*
2956          * After this point, we only want management frames,
2957          * so we can drop all remaining control frames to
2958          * cooked monitor interfaces.
2959          */
2960         return RX_DROP_MONITOR;
2961 }
2962
2963 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2964                                            struct ieee80211_mgmt *mgmt,
2965                                            size_t len)
2966 {
2967         struct ieee80211_local *local = sdata->local;
2968         struct sk_buff *skb;
2969         struct ieee80211_mgmt *resp;
2970
2971         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2972                 /* Not to own unicast address */
2973                 return;
2974         }
2975
2976         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2977             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2978                 /* Not from the current AP or not associated yet. */
2979                 return;
2980         }
2981
2982         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2983                 /* Too short SA Query request frame */
2984                 return;
2985         }
2986
2987         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2988         if (skb == NULL)
2989                 return;
2990
2991         skb_reserve(skb, local->hw.extra_tx_headroom);
2992         resp = skb_put_zero(skb, 24);
2993         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2994         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2995         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2996         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2997                                           IEEE80211_STYPE_ACTION);
2998         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2999         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3000         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3001         memcpy(resp->u.action.u.sa_query.trans_id,
3002                mgmt->u.action.u.sa_query.trans_id,
3003                WLAN_SA_QUERY_TR_ID_LEN);
3004
3005         ieee80211_tx_skb(sdata, skb);
3006 }
3007
3008 static ieee80211_rx_result debug_noinline
3009 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3010 {
3011         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3012         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3013
3014         /*
3015          * From here on, look only at management frames.
3016          * Data and control frames are already handled,
3017          * and unknown (reserved) frames are useless.
3018          */
3019         if (rx->skb->len < 24)
3020                 return RX_DROP_MONITOR;
3021
3022         if (!ieee80211_is_mgmt(mgmt->frame_control))
3023                 return RX_DROP_MONITOR;
3024
3025         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3026             ieee80211_is_beacon(mgmt->frame_control) &&
3027             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3028                 int sig = 0;
3029
3030                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3031                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3032                         sig = status->signal;
3033
3034                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3035                                             rx->skb->data, rx->skb->len,
3036                                             status->freq, sig);
3037                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3038         }
3039
3040         if (ieee80211_drop_unencrypted_mgmt(rx))
3041                 return RX_DROP_UNUSABLE;
3042
3043         return RX_CONTINUE;
3044 }
3045
3046 static ieee80211_rx_result debug_noinline
3047 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3048 {
3049         struct ieee80211_local *local = rx->local;
3050         struct ieee80211_sub_if_data *sdata = rx->sdata;
3051         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3052         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3053         int len = rx->skb->len;
3054
3055         if (!ieee80211_is_action(mgmt->frame_control))
3056                 return RX_CONTINUE;
3057
3058         /* drop too small frames */
3059         if (len < IEEE80211_MIN_ACTION_SIZE)
3060                 return RX_DROP_UNUSABLE;
3061
3062         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3063             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3064             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3065                 return RX_DROP_UNUSABLE;
3066
3067         switch (mgmt->u.action.category) {
3068         case WLAN_CATEGORY_HT:
3069                 /* reject HT action frames from stations not supporting HT */
3070                 if (!rx->sta->sta.ht_cap.ht_supported)
3071                         goto invalid;
3072
3073                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3074                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3075                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3076                     sdata->vif.type != NL80211_IFTYPE_AP &&
3077                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3078                         break;
3079
3080                 /* verify action & smps_control/chanwidth are present */
3081                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3082                         goto invalid;
3083
3084                 switch (mgmt->u.action.u.ht_smps.action) {
3085                 case WLAN_HT_ACTION_SMPS: {
3086                         struct ieee80211_supported_band *sband;
3087                         enum ieee80211_smps_mode smps_mode;
3088                         struct sta_opmode_info sta_opmode = {};
3089
3090                         /* convert to HT capability */
3091                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3092                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3093                                 smps_mode = IEEE80211_SMPS_OFF;
3094                                 break;
3095                         case WLAN_HT_SMPS_CONTROL_STATIC:
3096                                 smps_mode = IEEE80211_SMPS_STATIC;
3097                                 break;
3098                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3099                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3100                                 break;
3101                         default:
3102                                 goto invalid;
3103                         }
3104
3105                         /* if no change do nothing */
3106                         if (rx->sta->sta.smps_mode == smps_mode)
3107                                 goto handled;
3108                         rx->sta->sta.smps_mode = smps_mode;
3109                         sta_opmode.smps_mode =
3110                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3111                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3112
3113                         sband = rx->local->hw.wiphy->bands[status->band];
3114
3115                         rate_control_rate_update(local, sband, rx->sta,
3116                                                  IEEE80211_RC_SMPS_CHANGED);
3117                         cfg80211_sta_opmode_change_notify(sdata->dev,
3118                                                           rx->sta->addr,
3119                                                           &sta_opmode,
3120                                                           GFP_ATOMIC);
3121                         goto handled;
3122                 }
3123                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3124                         struct ieee80211_supported_band *sband;
3125                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3126                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3127                         struct sta_opmode_info sta_opmode = {};
3128
3129                         /* If it doesn't support 40 MHz it can't change ... */
3130                         if (!(rx->sta->sta.ht_cap.cap &
3131                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3132                                 goto handled;
3133
3134                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3135                                 max_bw = IEEE80211_STA_RX_BW_20;
3136                         else
3137                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3138
3139                         /* set cur_max_bandwidth and recalc sta bw */
3140                         rx->sta->cur_max_bandwidth = max_bw;
3141                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3142
3143                         if (rx->sta->sta.bandwidth == new_bw)
3144                                 goto handled;
3145
3146                         rx->sta->sta.bandwidth = new_bw;
3147                         sband = rx->local->hw.wiphy->bands[status->band];
3148                         sta_opmode.bw =
3149                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3150                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3151
3152                         rate_control_rate_update(local, sband, rx->sta,
3153                                                  IEEE80211_RC_BW_CHANGED);
3154                         cfg80211_sta_opmode_change_notify(sdata->dev,
3155                                                           rx->sta->addr,
3156                                                           &sta_opmode,
3157                                                           GFP_ATOMIC);
3158                         goto handled;
3159                 }
3160                 default:
3161                         goto invalid;
3162                 }
3163
3164                 break;
3165         case WLAN_CATEGORY_PUBLIC:
3166                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3167                         goto invalid;
3168                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3169                         break;
3170                 if (!rx->sta)
3171                         break;
3172                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3173                         break;
3174                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3175                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3176                         break;
3177                 if (len < offsetof(struct ieee80211_mgmt,
3178                                    u.action.u.ext_chan_switch.variable))
3179                         goto invalid;
3180                 goto queue;
3181         case WLAN_CATEGORY_VHT:
3182                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3183                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3184                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3185                     sdata->vif.type != NL80211_IFTYPE_AP &&
3186                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3187                         break;
3188
3189                 /* verify action code is present */
3190                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3191                         goto invalid;
3192
3193                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3194                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3195                         /* verify opmode is present */
3196                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3197                                 goto invalid;
3198                         goto queue;
3199                 }
3200                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3201                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3202                                 goto invalid;
3203                         goto queue;
3204                 }
3205                 default:
3206                         break;
3207                 }
3208                 break;
3209         case WLAN_CATEGORY_BACK:
3210                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3211                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3212                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3213                     sdata->vif.type != NL80211_IFTYPE_AP &&
3214                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3215                         break;
3216
3217                 /* verify action_code is present */
3218                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3219                         break;
3220
3221                 switch (mgmt->u.action.u.addba_req.action_code) {
3222                 case WLAN_ACTION_ADDBA_REQ:
3223                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3224                                    sizeof(mgmt->u.action.u.addba_req)))
3225                                 goto invalid;
3226                         break;
3227                 case WLAN_ACTION_ADDBA_RESP:
3228                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3229                                    sizeof(mgmt->u.action.u.addba_resp)))
3230                                 goto invalid;
3231                         break;
3232                 case WLAN_ACTION_DELBA:
3233                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3234                                    sizeof(mgmt->u.action.u.delba)))
3235                                 goto invalid;
3236                         break;
3237                 default:
3238                         goto invalid;
3239                 }
3240
3241                 goto queue;
3242         case WLAN_CATEGORY_SPECTRUM_MGMT:
3243                 /* verify action_code is present */
3244                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3245                         break;
3246
3247                 switch (mgmt->u.action.u.measurement.action_code) {
3248                 case WLAN_ACTION_SPCT_MSR_REQ:
3249                         if (status->band != NL80211_BAND_5GHZ)
3250                                 break;
3251
3252                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3253                                    sizeof(mgmt->u.action.u.measurement)))
3254                                 break;
3255
3256                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3257                                 break;
3258
3259                         ieee80211_process_measurement_req(sdata, mgmt, len);
3260                         goto handled;
3261                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3262                         u8 *bssid;
3263                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3264                                    sizeof(mgmt->u.action.u.chan_switch)))
3265                                 break;
3266
3267                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3268                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3269                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3270                                 break;
3271
3272                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3273                                 bssid = sdata->u.mgd.bssid;
3274                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3275                                 bssid = sdata->u.ibss.bssid;
3276                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3277                                 bssid = mgmt->sa;
3278                         else
3279                                 break;
3280
3281                         if (!ether_addr_equal(mgmt->bssid, bssid))
3282                                 break;
3283
3284                         goto queue;
3285                         }
3286                 }
3287                 break;
3288         case WLAN_CATEGORY_SA_QUERY:
3289                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3290                            sizeof(mgmt->u.action.u.sa_query)))
3291                         break;
3292
3293                 switch (mgmt->u.action.u.sa_query.action) {
3294                 case WLAN_ACTION_SA_QUERY_REQUEST:
3295                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3296                                 break;
3297                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3298                         goto handled;
3299                 }
3300                 break;
3301         case WLAN_CATEGORY_SELF_PROTECTED:
3302                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3303                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3304                         break;
3305
3306                 switch (mgmt->u.action.u.self_prot.action_code) {
3307                 case WLAN_SP_MESH_PEERING_OPEN:
3308                 case WLAN_SP_MESH_PEERING_CLOSE:
3309                 case WLAN_SP_MESH_PEERING_CONFIRM:
3310                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3311                                 goto invalid;
3312                         if (sdata->u.mesh.user_mpm)
3313                                 /* userspace handles this frame */
3314                                 break;
3315                         goto queue;
3316                 case WLAN_SP_MGK_INFORM:
3317                 case WLAN_SP_MGK_ACK:
3318                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3319                                 goto invalid;
3320                         break;
3321                 }
3322                 break;
3323         case WLAN_CATEGORY_MESH_ACTION:
3324                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3325                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3326                         break;
3327
3328                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3329                         break;
3330                 if (mesh_action_is_path_sel(mgmt) &&
3331                     !mesh_path_sel_is_hwmp(sdata))
3332                         break;
3333                 goto queue;
3334         }
3335
3336         return RX_CONTINUE;
3337
3338  invalid:
3339         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3340         /* will return in the next handlers */
3341         return RX_CONTINUE;
3342
3343  handled:
3344         if (rx->sta)
3345                 rx->sta->rx_stats.packets++;
3346         dev_kfree_skb(rx->skb);
3347         return RX_QUEUED;
3348
3349  queue:
3350         skb_queue_tail(&sdata->skb_queue, rx->skb);
3351         ieee80211_queue_work(&local->hw, &sdata->work);
3352         if (rx->sta)
3353                 rx->sta->rx_stats.packets++;
3354         return RX_QUEUED;
3355 }
3356
3357 static ieee80211_rx_result debug_noinline
3358 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3359 {
3360         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3361         int sig = 0;
3362
3363         /* skip known-bad action frames and return them in the next handler */
3364         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3365                 return RX_CONTINUE;
3366
3367         /*
3368          * Getting here means the kernel doesn't know how to handle
3369          * it, but maybe userspace does ... include returned frames
3370          * so userspace can register for those to know whether ones
3371          * it transmitted were processed or returned.
3372          */
3373
3374         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3375             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3376                 sig = status->signal;
3377
3378         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3379                              rx->skb->data, rx->skb->len, 0)) {
3380                 if (rx->sta)
3381                         rx->sta->rx_stats.packets++;
3382                 dev_kfree_skb(rx->skb);
3383                 return RX_QUEUED;
3384         }
3385
3386         return RX_CONTINUE;
3387 }
3388
3389 static ieee80211_rx_result debug_noinline
3390 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3391 {
3392         struct ieee80211_local *local = rx->local;
3393         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3394         struct sk_buff *nskb;
3395         struct ieee80211_sub_if_data *sdata = rx->sdata;
3396         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3397
3398         if (!ieee80211_is_action(mgmt->frame_control))
3399                 return RX_CONTINUE;
3400
3401         /*
3402          * For AP mode, hostapd is responsible for handling any action
3403          * frames that we didn't handle, including returning unknown
3404          * ones. For all other modes we will return them to the sender,
3405          * setting the 0x80 bit in the action category, as required by
3406          * 802.11-2012 9.24.4.
3407          * Newer versions of hostapd shall also use the management frame
3408          * registration mechanisms, but older ones still use cooked
3409          * monitor interfaces so push all frames there.
3410          */
3411         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3412             (sdata->vif.type == NL80211_IFTYPE_AP ||
3413              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3414                 return RX_DROP_MONITOR;
3415
3416         if (is_multicast_ether_addr(mgmt->da))
3417                 return RX_DROP_MONITOR;
3418
3419         /* do not return rejected action frames */
3420         if (mgmt->u.action.category & 0x80)
3421                 return RX_DROP_UNUSABLE;
3422
3423         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3424                                GFP_ATOMIC);
3425         if (nskb) {
3426                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3427
3428                 nmgmt->u.action.category |= 0x80;
3429                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3430                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3431
3432                 memset(nskb->cb, 0, sizeof(nskb->cb));
3433
3434                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3435                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3436
3437                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3438                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3439                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3440                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3441                                 info->hw_queue =
3442                                         local->hw.offchannel_tx_hw_queue;
3443                 }
3444
3445                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3446                                             status->band, 0);
3447         }
3448         dev_kfree_skb(rx->skb);
3449         return RX_QUEUED;
3450 }
3451
3452 static ieee80211_rx_result debug_noinline
3453 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3454 {
3455         struct ieee80211_sub_if_data *sdata = rx->sdata;
3456         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3457         __le16 stype;
3458
3459         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3460
3461         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3462             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3463             sdata->vif.type != NL80211_IFTYPE_OCB &&
3464             sdata->vif.type != NL80211_IFTYPE_STATION)
3465                 return RX_DROP_MONITOR;
3466
3467         switch (stype) {
3468         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3469         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3470         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3471                 /* process for all: mesh, mlme, ibss */
3472                 break;
3473         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3474         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3475         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3476         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3477                 if (is_multicast_ether_addr(mgmt->da) &&
3478                     !is_broadcast_ether_addr(mgmt->da))
3479                         return RX_DROP_MONITOR;
3480
3481                 /* process only for station */
3482                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3483                         return RX_DROP_MONITOR;
3484                 break;
3485         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3486                 /* process only for ibss and mesh */
3487                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3488                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3489                         return RX_DROP_MONITOR;
3490                 break;
3491         default:
3492                 return RX_DROP_MONITOR;
3493         }
3494
3495         /* queue up frame and kick off work to process it */
3496         skb_queue_tail(&sdata->skb_queue, rx->skb);
3497         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3498         if (rx->sta)
3499                 rx->sta->rx_stats.packets++;
3500
3501         return RX_QUEUED;
3502 }
3503
3504 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3505                                         struct ieee80211_rate *rate)
3506 {
3507         struct ieee80211_sub_if_data *sdata;
3508         struct ieee80211_local *local = rx->local;
3509         struct sk_buff *skb = rx->skb, *skb2;
3510         struct net_device *prev_dev = NULL;
3511         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3512         int needed_headroom;
3513
3514         /*
3515          * If cooked monitor has been processed already, then
3516          * don't do it again. If not, set the flag.
3517          */
3518         if (rx->flags & IEEE80211_RX_CMNTR)
3519                 goto out_free_skb;
3520         rx->flags |= IEEE80211_RX_CMNTR;
3521
3522         /* If there are no cooked monitor interfaces, just free the SKB */
3523         if (!local->cooked_mntrs)
3524                 goto out_free_skb;
3525
3526         /* vendor data is long removed here */
3527         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3528         /* room for the radiotap header based on driver features */
3529         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3530
3531         if (skb_headroom(skb) < needed_headroom &&
3532             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3533                 goto out_free_skb;
3534
3535         /* prepend radiotap information */
3536         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3537                                          false);
3538
3539         skb_reset_mac_header(skb);
3540         skb->ip_summed = CHECKSUM_UNNECESSARY;
3541         skb->pkt_type = PACKET_OTHERHOST;
3542         skb->protocol = htons(ETH_P_802_2);
3543
3544         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3545                 if (!ieee80211_sdata_running(sdata))
3546                         continue;
3547
3548                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3549                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3550                         continue;
3551
3552                 if (prev_dev) {
3553                         skb2 = skb_clone(skb, GFP_ATOMIC);
3554                         if (skb2) {
3555                                 skb2->dev = prev_dev;
3556                                 netif_receive_skb(skb2);
3557                         }
3558                 }
3559
3560                 prev_dev = sdata->dev;
3561                 ieee80211_rx_stats(sdata->dev, skb->len);
3562         }
3563
3564         if (prev_dev) {
3565                 skb->dev = prev_dev;
3566                 netif_receive_skb(skb);
3567                 return;
3568         }
3569
3570  out_free_skb:
3571         dev_kfree_skb(skb);
3572 }
3573
3574 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3575                                          ieee80211_rx_result res)
3576 {
3577         switch (res) {
3578         case RX_DROP_MONITOR:
3579                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3580                 if (rx->sta)
3581                         rx->sta->rx_stats.dropped++;
3582                 /* fall through */
3583         case RX_CONTINUE: {
3584                 struct ieee80211_rate *rate = NULL;
3585                 struct ieee80211_supported_band *sband;
3586                 struct ieee80211_rx_status *status;
3587
3588                 status = IEEE80211_SKB_RXCB((rx->skb));
3589
3590                 sband = rx->local->hw.wiphy->bands[status->band];
3591                 if (status->encoding == RX_ENC_LEGACY)
3592                         rate = &sband->bitrates[status->rate_idx];
3593
3594                 ieee80211_rx_cooked_monitor(rx, rate);
3595                 break;
3596                 }
3597         case RX_DROP_UNUSABLE:
3598                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3599                 if (rx->sta)
3600                         rx->sta->rx_stats.dropped++;
3601                 dev_kfree_skb(rx->skb);
3602                 break;
3603         case RX_QUEUED:
3604                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3605                 break;
3606         }
3607 }
3608
3609 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3610                                   struct sk_buff_head *frames)
3611 {
3612         ieee80211_rx_result res = RX_DROP_MONITOR;
3613         struct sk_buff *skb;
3614
3615 #define CALL_RXH(rxh)                   \
3616         do {                            \
3617                 res = rxh(rx);          \
3618                 if (res != RX_CONTINUE) \
3619                         goto rxh_next;  \
3620         } while (0)
3621
3622         /* Lock here to avoid hitting all of the data used in the RX
3623          * path (e.g. key data, station data, ...) concurrently when
3624          * a frame is released from the reorder buffer due to timeout
3625          * from the timer, potentially concurrently with RX from the
3626          * driver.
3627          */
3628         spin_lock_bh(&rx->local->rx_path_lock);
3629
3630         while ((skb = __skb_dequeue(frames))) {
3631                 /*
3632                  * all the other fields are valid across frames
3633                  * that belong to an aMPDU since they are on the
3634                  * same TID from the same station
3635                  */
3636                 rx->skb = skb;
3637
3638                 CALL_RXH(ieee80211_rx_h_check_more_data);
3639                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3640                 CALL_RXH(ieee80211_rx_h_sta_process);
3641                 CALL_RXH(ieee80211_rx_h_decrypt);
3642                 CALL_RXH(ieee80211_rx_h_defragment);
3643                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3644                 /* must be after MMIC verify so header is counted in MPDU mic */
3645 #ifdef CONFIG_MAC80211_MESH
3646                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3647                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3648 #endif
3649                 CALL_RXH(ieee80211_rx_h_amsdu);
3650                 CALL_RXH(ieee80211_rx_h_data);
3651
3652                 /* special treatment -- needs the queue */
3653                 res = ieee80211_rx_h_ctrl(rx, frames);
3654                 if (res != RX_CONTINUE)
3655                         goto rxh_next;
3656
3657                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3658                 CALL_RXH(ieee80211_rx_h_action);
3659                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3660                 CALL_RXH(ieee80211_rx_h_action_return);
3661                 CALL_RXH(ieee80211_rx_h_mgmt);
3662
3663  rxh_next:
3664                 ieee80211_rx_handlers_result(rx, res);
3665
3666 #undef CALL_RXH
3667         }
3668
3669         spin_unlock_bh(&rx->local->rx_path_lock);
3670 }
3671
3672 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3673 {
3674         struct sk_buff_head reorder_release;
3675         ieee80211_rx_result res = RX_DROP_MONITOR;
3676
3677         __skb_queue_head_init(&reorder_release);
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         CALL_RXH(ieee80211_rx_h_check_dup);
3687         CALL_RXH(ieee80211_rx_h_check);
3688
3689         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3690
3691         ieee80211_rx_handlers(rx, &reorder_release);
3692         return;
3693
3694  rxh_next:
3695         ieee80211_rx_handlers_result(rx, res);
3696
3697 #undef CALL_RXH
3698 }
3699
3700 /*
3701  * This function makes calls into the RX path, therefore
3702  * it has to be invoked under RCU read lock.
3703  */
3704 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3705 {
3706         struct sk_buff_head frames;
3707         struct ieee80211_rx_data rx = {
3708                 .sta = sta,
3709                 .sdata = sta->sdata,
3710                 .local = sta->local,
3711                 /* This is OK -- must be QoS data frame */
3712                 .security_idx = tid,
3713                 .seqno_idx = tid,
3714                 .napi = NULL, /* must be NULL to not have races */
3715         };
3716         struct tid_ampdu_rx *tid_agg_rx;
3717
3718         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3719         if (!tid_agg_rx)
3720                 return;
3721
3722         __skb_queue_head_init(&frames);
3723
3724         spin_lock(&tid_agg_rx->reorder_lock);
3725         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3726         spin_unlock(&tid_agg_rx->reorder_lock);
3727
3728         if (!skb_queue_empty(&frames)) {
3729                 struct ieee80211_event event = {
3730                         .type = BA_FRAME_TIMEOUT,
3731                         .u.ba.tid = tid,
3732                         .u.ba.sta = &sta->sta,
3733                 };
3734                 drv_event_callback(rx.local, rx.sdata, &event);
3735         }
3736
3737         ieee80211_rx_handlers(&rx, &frames);
3738 }
3739
3740 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3741                                           u16 ssn, u64 filtered,
3742                                           u16 received_mpdus)
3743 {
3744         struct sta_info *sta;
3745         struct tid_ampdu_rx *tid_agg_rx;
3746         struct sk_buff_head frames;
3747         struct ieee80211_rx_data rx = {
3748                 /* This is OK -- must be QoS data frame */
3749                 .security_idx = tid,
3750                 .seqno_idx = tid,
3751         };
3752         int i, diff;
3753
3754         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3755                 return;
3756
3757         __skb_queue_head_init(&frames);
3758
3759         sta = container_of(pubsta, struct sta_info, sta);
3760
3761         rx.sta = sta;
3762         rx.sdata = sta->sdata;
3763         rx.local = sta->local;
3764
3765         rcu_read_lock();
3766         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3767         if (!tid_agg_rx)
3768                 goto out;
3769
3770         spin_lock_bh(&tid_agg_rx->reorder_lock);
3771
3772         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3773                 int release;
3774
3775                 /* release all frames in the reorder buffer */
3776                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3777                            IEEE80211_SN_MODULO;
3778                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3779                                                  release, &frames);
3780                 /* update ssn to match received ssn */
3781                 tid_agg_rx->head_seq_num = ssn;
3782         } else {
3783                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3784                                                  &frames);
3785         }
3786
3787         /* handle the case that received ssn is behind the mac ssn.
3788          * it can be tid_agg_rx->buf_size behind and still be valid */
3789         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3790         if (diff >= tid_agg_rx->buf_size) {
3791                 tid_agg_rx->reorder_buf_filtered = 0;
3792                 goto release;
3793         }
3794         filtered = filtered >> diff;
3795         ssn += diff;
3796
3797         /* update bitmap */
3798         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3799                 int index = (ssn + i) % tid_agg_rx->buf_size;
3800
3801                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3802                 if (filtered & BIT_ULL(i))
3803                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3804         }
3805
3806         /* now process also frames that the filter marking released */
3807         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3808
3809 release:
3810         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3811
3812         ieee80211_rx_handlers(&rx, &frames);
3813
3814  out:
3815         rcu_read_unlock();
3816 }
3817 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3818
3819 /* main receive path */
3820
3821 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3822 {
3823         struct ieee80211_sub_if_data *sdata = rx->sdata;
3824         struct sk_buff *skb = rx->skb;
3825         struct ieee80211_hdr *hdr = (void *)skb->data;
3826         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3827         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3828         bool multicast = is_multicast_ether_addr(hdr->addr1);
3829
3830         switch (sdata->vif.type) {
3831         case NL80211_IFTYPE_STATION:
3832                 if (!bssid && !sdata->u.mgd.use_4addr)
3833                         return false;
3834                 if (multicast)
3835                         return true;
3836                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3837         case NL80211_IFTYPE_ADHOC:
3838                 if (!bssid)
3839                         return false;
3840                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3841                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3842                         return false;
3843                 if (ieee80211_is_beacon(hdr->frame_control))
3844                         return true;
3845                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3846                         return false;
3847                 if (!multicast &&
3848                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3849                         return false;
3850                 if (!rx->sta) {
3851                         int rate_idx;
3852                         if (status->encoding != RX_ENC_LEGACY)
3853                                 rate_idx = 0; /* TODO: HT/VHT rates */
3854                         else
3855                                 rate_idx = status->rate_idx;
3856                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3857                                                  BIT(rate_idx));
3858                 }
3859                 return true;
3860         case NL80211_IFTYPE_OCB:
3861                 if (!bssid)
3862                         return false;
3863                 if (!ieee80211_is_data_present(hdr->frame_control))
3864                         return false;
3865                 if (!is_broadcast_ether_addr(bssid))
3866                         return false;
3867                 if (!multicast &&
3868                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3869                         return false;
3870                 if (!rx->sta) {
3871                         int rate_idx;
3872                         if (status->encoding != RX_ENC_LEGACY)
3873                                 rate_idx = 0; /* TODO: HT rates */
3874                         else
3875                                 rate_idx = status->rate_idx;
3876                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3877                                                 BIT(rate_idx));
3878                 }
3879                 return true;
3880         case NL80211_IFTYPE_MESH_POINT:
3881                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3882                         return false;
3883                 if (multicast)
3884                         return true;
3885                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3886         case NL80211_IFTYPE_AP_VLAN:
3887         case NL80211_IFTYPE_AP:
3888                 if (!bssid)
3889                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3890
3891                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3892                         /*
3893                          * Accept public action frames even when the
3894                          * BSSID doesn't match, this is used for P2P
3895                          * and location updates. Note that mac80211
3896                          * itself never looks at these frames.
3897                          */
3898                         if (!multicast &&
3899                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3900                                 return false;
3901                         if (ieee80211_is_public_action(hdr, skb->len))
3902                                 return true;
3903                         return ieee80211_is_beacon(hdr->frame_control);
3904                 }
3905
3906                 if (!ieee80211_has_tods(hdr->frame_control)) {
3907                         /* ignore data frames to TDLS-peers */
3908                         if (ieee80211_is_data(hdr->frame_control))
3909                                 return false;
3910                         /* ignore action frames to TDLS-peers */
3911                         if (ieee80211_is_action(hdr->frame_control) &&
3912                             !is_broadcast_ether_addr(bssid) &&
3913                             !ether_addr_equal(bssid, hdr->addr1))
3914                                 return false;
3915                 }
3916
3917                 /*
3918                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3919                  * the BSSID - we've checked that already but may have accepted
3920                  * the wildcard (ff:ff:ff:ff:ff:ff).
3921                  *
3922                  * It also says:
3923                  *      The BSSID of the Data frame is determined as follows:
3924                  *      a) If the STA is contained within an AP or is associated
3925                  *         with an AP, the BSSID is the address currently in use
3926                  *         by the STA contained in the AP.
3927                  *
3928                  * So we should not accept data frames with an address that's
3929                  * multicast.
3930                  *
3931                  * Accepting it also opens a security problem because stations
3932                  * could encrypt it with the GTK and inject traffic that way.
3933                  */
3934                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3935                         return false;
3936
3937                 return true;
3938         case NL80211_IFTYPE_WDS:
3939                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3940                         return false;
3941                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3942         case NL80211_IFTYPE_P2P_DEVICE:
3943                 return ieee80211_is_public_action(hdr, skb->len) ||
3944                        ieee80211_is_probe_req(hdr->frame_control) ||
3945                        ieee80211_is_probe_resp(hdr->frame_control) ||
3946                        ieee80211_is_beacon(hdr->frame_control);
3947         case NL80211_IFTYPE_NAN:
3948                 /* Currently no frames on NAN interface are allowed */
3949                 return false;
3950         default:
3951                 break;
3952         }
3953
3954         WARN_ON_ONCE(1);
3955         return false;
3956 }
3957
3958 void ieee80211_check_fast_rx(struct sta_info *sta)
3959 {
3960         struct ieee80211_sub_if_data *sdata = sta->sdata;
3961         struct ieee80211_local *local = sdata->local;
3962         struct ieee80211_key *key;
3963         struct ieee80211_fast_rx fastrx = {
3964                 .dev = sdata->dev,
3965                 .vif_type = sdata->vif.type,
3966                 .control_port_protocol = sdata->control_port_protocol,
3967         }, *old, *new = NULL;
3968         bool assign = false;
3969
3970         /* use sparse to check that we don't return without updating */
3971         __acquire(check_fast_rx);
3972
3973         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3974         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3975         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3976         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3977
3978         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3979
3980         /* fast-rx doesn't do reordering */
3981         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3982             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3983                 goto clear;
3984
3985         switch (sdata->vif.type) {
3986         case NL80211_IFTYPE_STATION:
3987                 if (sta->sta.tdls) {
3988                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3989                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3990                         fastrx.expected_ds_bits = 0;
3991                 } else {
3992                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3993                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3994                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3995                         fastrx.expected_ds_bits =
3996                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3997                 }
3998
3999                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4000                         fastrx.expected_ds_bits |=
4001                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4002                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4003                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4004                 }
4005
4006                 if (!sdata->u.mgd.powersave)
4007                         break;
4008
4009                 /* software powersave is a huge mess, avoid all of it */
4010                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4011                         goto clear;
4012                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4013                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4014                         goto clear;
4015                 break;
4016         case NL80211_IFTYPE_AP_VLAN:
4017         case NL80211_IFTYPE_AP:
4018                 /* parallel-rx requires this, at least with calls to
4019                  * ieee80211_sta_ps_transition()
4020                  */
4021                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4022                         goto clear;
4023                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4024                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4025                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4026
4027                 fastrx.internal_forward =
4028                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4029                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4030                          !sdata->u.vlan.sta);
4031
4032                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4033                     sdata->u.vlan.sta) {
4034                         fastrx.expected_ds_bits |=
4035                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4036                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4037                         fastrx.internal_forward = 0;
4038                 }
4039
4040                 break;
4041         default:
4042                 goto clear;
4043         }
4044
4045         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4046                 goto clear;
4047
4048         rcu_read_lock();
4049         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4050         if (key) {
4051                 switch (key->conf.cipher) {
4052                 case WLAN_CIPHER_SUITE_TKIP:
4053                         /* we don't want to deal with MMIC in fast-rx */
4054                         goto clear_rcu;
4055                 case WLAN_CIPHER_SUITE_CCMP:
4056                 case WLAN_CIPHER_SUITE_CCMP_256:
4057                 case WLAN_CIPHER_SUITE_GCMP:
4058                 case WLAN_CIPHER_SUITE_GCMP_256:
4059                         break;
4060                 default:
4061                         /* We also don't want to deal with
4062                          * WEP or cipher scheme.
4063                          */
4064                         goto clear_rcu;
4065                 }
4066
4067                 fastrx.key = true;
4068                 fastrx.icv_len = key->conf.icv_len;
4069         }
4070
4071         assign = true;
4072  clear_rcu:
4073         rcu_read_unlock();
4074  clear:
4075         __release(check_fast_rx);
4076
4077         if (assign)
4078                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4079
4080         spin_lock_bh(&sta->lock);
4081         old = rcu_dereference_protected(sta->fast_rx, true);
4082         rcu_assign_pointer(sta->fast_rx, new);
4083         spin_unlock_bh(&sta->lock);
4084
4085         if (old)
4086                 kfree_rcu(old, rcu_head);
4087 }
4088
4089 void ieee80211_clear_fast_rx(struct sta_info *sta)
4090 {
4091         struct ieee80211_fast_rx *old;
4092
4093         spin_lock_bh(&sta->lock);
4094         old = rcu_dereference_protected(sta->fast_rx, true);
4095         RCU_INIT_POINTER(sta->fast_rx, NULL);
4096         spin_unlock_bh(&sta->lock);
4097
4098         if (old)
4099                 kfree_rcu(old, rcu_head);
4100 }
4101
4102 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4103 {
4104         struct ieee80211_local *local = sdata->local;
4105         struct sta_info *sta;
4106
4107         lockdep_assert_held(&local->sta_mtx);
4108
4109         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4110                 if (sdata != sta->sdata &&
4111                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4112                         continue;
4113                 ieee80211_check_fast_rx(sta);
4114         }
4115 }
4116
4117 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4118 {
4119         struct ieee80211_local *local = sdata->local;
4120
4121         mutex_lock(&local->sta_mtx);
4122         __ieee80211_check_fast_rx_iface(sdata);
4123         mutex_unlock(&local->sta_mtx);
4124 }
4125
4126 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4127                                      struct ieee80211_fast_rx *fast_rx)
4128 {
4129         struct sk_buff *skb = rx->skb;
4130         struct ieee80211_hdr *hdr = (void *)skb->data;
4131         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4132         struct sta_info *sta = rx->sta;
4133         int orig_len = skb->len;
4134         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4135         int snap_offs = hdrlen;
4136         struct {
4137                 u8 snap[sizeof(rfc1042_header)];
4138                 __be16 proto;
4139         } *payload __aligned(2);
4140         struct {
4141                 u8 da[ETH_ALEN];
4142                 u8 sa[ETH_ALEN];
4143         } addrs __aligned(2);
4144         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4145
4146         if (fast_rx->uses_rss)
4147                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4148
4149         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4150          * to a common data structure; drivers can implement that per queue
4151          * but we don't have that information in mac80211
4152          */
4153         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4154                 return false;
4155
4156 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4157
4158         /* If using encryption, we also need to have:
4159          *  - PN_VALIDATED: similar, but the implementation is tricky
4160          *  - DECRYPTED: necessary for PN_VALIDATED
4161          */
4162         if (fast_rx->key &&
4163             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4164                 return false;
4165
4166         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4167                 return false;
4168
4169         if (unlikely(ieee80211_is_frag(hdr)))
4170                 return false;
4171
4172         /* Since our interface address cannot be multicast, this
4173          * implicitly also rejects multicast frames without the
4174          * explicit check.
4175          *
4176          * We shouldn't get any *data* frames not addressed to us
4177          * (AP mode will accept multicast *management* frames), but
4178          * punting here will make it go through the full checks in
4179          * ieee80211_accept_frame().
4180          */
4181         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4182                 return false;
4183
4184         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4185                                               IEEE80211_FCTL_TODS)) !=
4186             fast_rx->expected_ds_bits)
4187                 return false;
4188
4189         /* assign the key to drop unencrypted frames (later)
4190          * and strip the IV/MIC if necessary
4191          */
4192         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4193                 /* GCMP header length is the same */
4194                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4195         }
4196
4197         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4198                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4199                         goto drop;
4200
4201                 payload = (void *)(skb->data + snap_offs);
4202
4203                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4204                         return false;
4205
4206                 /* Don't handle these here since they require special code.
4207                  * Accept AARP and IPX even though they should come with a
4208                  * bridge-tunnel header - but if we get them this way then
4209                  * there's little point in discarding them.
4210                  */
4211                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4212                              payload->proto == fast_rx->control_port_protocol))
4213                         return false;
4214         }
4215
4216         /* after this point, don't punt to the slowpath! */
4217
4218         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4219             pskb_trim(skb, skb->len - fast_rx->icv_len))
4220                 goto drop;
4221
4222         if (unlikely(fast_rx->sta_notify)) {
4223                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4224                 fast_rx->sta_notify = false;
4225         }
4226
4227         /* statistics part of ieee80211_rx_h_sta_process() */
4228         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4229                 stats->last_signal = status->signal;
4230                 if (!fast_rx->uses_rss)
4231                         ewma_signal_add(&sta->rx_stats_avg.signal,
4232                                         -status->signal);
4233         }
4234
4235         if (status->chains) {
4236                 int i;
4237
4238                 stats->chains = status->chains;
4239                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4240                         int signal = status->chain_signal[i];
4241
4242                         if (!(status->chains & BIT(i)))
4243                                 continue;
4244
4245                         stats->chain_signal_last[i] = signal;
4246                         if (!fast_rx->uses_rss)
4247                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4248                                                 -signal);
4249                 }
4250         }
4251         /* end of statistics */
4252
4253         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4254                 goto drop;
4255
4256         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4257                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4258                     RX_QUEUED)
4259                         goto drop;
4260
4261                 return true;
4262         }
4263
4264         stats->last_rx = jiffies;
4265         stats->last_rate = sta_stats_encode_rate(status);
4266
4267         stats->fragments++;
4268         stats->packets++;
4269
4270         /* do the header conversion - first grab the addresses */
4271         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4272         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4273         /* remove the SNAP but leave the ethertype */
4274         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4275         /* push the addresses in front */
4276         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4277
4278         skb->dev = fast_rx->dev;
4279
4280         ieee80211_rx_stats(fast_rx->dev, skb->len);
4281
4282         /* The seqno index has the same property as needed
4283          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4284          * for non-QoS-data frames. Here we know it's a data
4285          * frame, so count MSDUs.
4286          */
4287         u64_stats_update_begin(&stats->syncp);
4288         stats->msdu[rx->seqno_idx]++;
4289         stats->bytes += orig_len;
4290         u64_stats_update_end(&stats->syncp);
4291
4292         if (fast_rx->internal_forward) {
4293                 struct sk_buff *xmit_skb = NULL;
4294                 if (is_multicast_ether_addr(addrs.da)) {
4295                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4296                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4297                            sta_info_get(rx->sdata, addrs.da)) {
4298                         xmit_skb = skb;
4299                         skb = NULL;
4300                 }
4301
4302                 if (xmit_skb) {
4303                         /*
4304                          * Send to wireless media and increase priority by 256
4305                          * to keep the received priority instead of
4306                          * reclassifying the frame (see cfg80211_classify8021d).
4307                          */
4308                         xmit_skb->priority += 256;
4309                         xmit_skb->protocol = htons(ETH_P_802_3);
4310                         skb_reset_network_header(xmit_skb);
4311                         skb_reset_mac_header(xmit_skb);
4312                         dev_queue_xmit(xmit_skb);
4313                 }
4314
4315                 if (!skb)
4316                         return true;
4317         }
4318
4319         /* deliver to local stack */
4320         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4321         memset(skb->cb, 0, sizeof(skb->cb));
4322         if (rx->napi)
4323                 napi_gro_receive(rx->napi, skb);
4324         else
4325                 netif_receive_skb(skb);
4326
4327         return true;
4328  drop:
4329         dev_kfree_skb(skb);
4330         stats->dropped++;
4331         return true;
4332 }
4333
4334 /*
4335  * This function returns whether or not the SKB
4336  * was destined for RX processing or not, which,
4337  * if consume is true, is equivalent to whether
4338  * or not the skb was consumed.
4339  */
4340 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4341                                             struct sk_buff *skb, bool consume)
4342 {
4343         struct ieee80211_local *local = rx->local;
4344         struct ieee80211_sub_if_data *sdata = rx->sdata;
4345
4346         rx->skb = skb;
4347
4348         /* See if we can do fast-rx; if we have to copy we already lost,
4349          * so punt in that case. We should never have to deliver a data
4350          * frame to multiple interfaces anyway.
4351          *
4352          * We skip the ieee80211_accept_frame() call and do the necessary
4353          * checking inside ieee80211_invoke_fast_rx().
4354          */
4355         if (consume && rx->sta) {
4356                 struct ieee80211_fast_rx *fast_rx;
4357
4358                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4359                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4360                         return true;
4361         }
4362
4363         if (!ieee80211_accept_frame(rx))
4364                 return false;
4365
4366         if (!consume) {
4367                 skb = skb_copy(skb, GFP_ATOMIC);
4368                 if (!skb) {
4369                         if (net_ratelimit())
4370                                 wiphy_debug(local->hw.wiphy,
4371                                         "failed to copy skb for %s\n",
4372                                         sdata->name);
4373                         return true;
4374                 }
4375
4376                 rx->skb = skb;
4377         }
4378
4379         ieee80211_invoke_rx_handlers(rx);
4380         return true;
4381 }
4382
4383 /*
4384  * This is the actual Rx frames handler. as it belongs to Rx path it must
4385  * be called with rcu_read_lock protection.
4386  */
4387 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4388                                          struct ieee80211_sta *pubsta,
4389                                          struct sk_buff *skb,
4390                                          struct napi_struct *napi)
4391 {
4392         struct ieee80211_local *local = hw_to_local(hw);
4393         struct ieee80211_sub_if_data *sdata;
4394         struct ieee80211_hdr *hdr;
4395         __le16 fc;
4396         struct ieee80211_rx_data rx;
4397         struct ieee80211_sub_if_data *prev;
4398         struct rhlist_head *tmp;
4399         int err = 0;
4400
4401         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4402         memset(&rx, 0, sizeof(rx));
4403         rx.skb = skb;
4404         rx.local = local;
4405         rx.napi = napi;
4406
4407         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4408                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4409
4410         if (ieee80211_is_mgmt(fc)) {
4411                 /* drop frame if too short for header */
4412                 if (skb->len < ieee80211_hdrlen(fc))
4413                         err = -ENOBUFS;
4414                 else
4415                         err = skb_linearize(skb);
4416         } else {
4417                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4418         }
4419
4420         if (err) {
4421                 dev_kfree_skb(skb);
4422                 return;
4423         }
4424
4425         hdr = (struct ieee80211_hdr *)skb->data;
4426         ieee80211_parse_qos(&rx);
4427         ieee80211_verify_alignment(&rx);
4428
4429         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4430                      ieee80211_is_beacon(hdr->frame_control)))
4431                 ieee80211_scan_rx(local, skb);
4432
4433         if (ieee80211_is_data(fc)) {
4434                 struct sta_info *sta, *prev_sta;
4435
4436                 if (pubsta) {
4437                         rx.sta = container_of(pubsta, struct sta_info, sta);
4438                         rx.sdata = rx.sta->sdata;
4439                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4440                                 return;
4441                         goto out;
4442                 }
4443
4444                 prev_sta = NULL;
4445
4446                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4447                         if (!prev_sta) {
4448                                 prev_sta = sta;
4449                                 continue;
4450                         }
4451
4452                         rx.sta = prev_sta;
4453                         rx.sdata = prev_sta->sdata;
4454                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4455
4456                         prev_sta = sta;
4457                 }
4458
4459                 if (prev_sta) {
4460                         rx.sta = prev_sta;
4461                         rx.sdata = prev_sta->sdata;
4462
4463                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4464                                 return;
4465                         goto out;
4466                 }
4467         }
4468
4469         prev = NULL;
4470
4471         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4472                 if (!ieee80211_sdata_running(sdata))
4473                         continue;
4474
4475                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4476                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4477                         continue;
4478
4479                 /*
4480                  * frame is destined for this interface, but if it's
4481                  * not also for the previous one we handle that after
4482                  * the loop to avoid copying the SKB once too much
4483                  */
4484
4485                 if (!prev) {
4486                         prev = sdata;
4487                         continue;
4488                 }
4489
4490                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4491                 rx.sdata = prev;
4492                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4493
4494                 prev = sdata;
4495         }
4496
4497         if (prev) {
4498                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4499                 rx.sdata = prev;
4500
4501                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4502                         return;
4503         }
4504
4505  out:
4506         dev_kfree_skb(skb);
4507 }
4508
4509 /*
4510  * This is the receive path handler. It is called by a low level driver when an
4511  * 802.11 MPDU is received from the hardware.
4512  */
4513 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4514                        struct sk_buff *skb, struct napi_struct *napi)
4515 {
4516         struct ieee80211_local *local = hw_to_local(hw);
4517         struct ieee80211_rate *rate = NULL;
4518         struct ieee80211_supported_band *sband;
4519         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4520
4521         WARN_ON_ONCE(softirq_count() == 0);
4522
4523         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4524                 goto drop;
4525
4526         sband = local->hw.wiphy->bands[status->band];
4527         if (WARN_ON(!sband))
4528                 goto drop;
4529
4530         /*
4531          * If we're suspending, it is possible although not too likely
4532          * that we'd be receiving frames after having already partially
4533          * quiesced the stack. We can't process such frames then since
4534          * that might, for example, cause stations to be added or other
4535          * driver callbacks be invoked.
4536          */
4537         if (unlikely(local->quiescing || local->suspended))
4538                 goto drop;
4539
4540         /* We might be during a HW reconfig, prevent Rx for the same reason */
4541         if (unlikely(local->in_reconfig))
4542                 goto drop;
4543
4544         /*
4545          * The same happens when we're not even started,
4546          * but that's worth a warning.
4547          */
4548         if (WARN_ON(!local->started))
4549                 goto drop;
4550
4551         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4552                 /*
4553                  * Validate the rate, unless a PLCP error means that
4554                  * we probably can't have a valid rate here anyway.
4555                  */
4556
4557                 switch (status->encoding) {
4558                 case RX_ENC_HT:
4559                         /*
4560                          * rate_idx is MCS index, which can be [0-76]
4561                          * as documented on:
4562                          *
4563                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4564                          *
4565                          * Anything else would be some sort of driver or
4566                          * hardware error. The driver should catch hardware
4567                          * errors.
4568                          */
4569                         if (WARN(status->rate_idx > 76,
4570                                  "Rate marked as an HT rate but passed "
4571                                  "status->rate_idx is not "
4572                                  "an MCS index [0-76]: %d (0x%02x)\n",
4573                                  status->rate_idx,
4574                                  status->rate_idx))
4575                                 goto drop;
4576                         break;
4577                 case RX_ENC_VHT:
4578                         if (WARN_ONCE(status->rate_idx > 9 ||
4579                                       !status->nss ||
4580                                       status->nss > 8,
4581                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4582                                       status->rate_idx, status->nss))
4583                                 goto drop;
4584                         break;
4585                 case RX_ENC_HE:
4586                         if (WARN_ONCE(status->rate_idx > 11 ||
4587                                       !status->nss ||
4588                                       status->nss > 8,
4589                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4590                                       status->rate_idx, status->nss))
4591                                 goto drop;
4592                         break;
4593                 default:
4594                         WARN_ON_ONCE(1);
4595                         /* fall through */
4596                 case RX_ENC_LEGACY:
4597                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4598                                 goto drop;
4599                         rate = &sband->bitrates[status->rate_idx];
4600                 }
4601         }
4602
4603         status->rx_flags = 0;
4604
4605         /*
4606          * key references and virtual interfaces are protected using RCU
4607          * and this requires that we are in a read-side RCU section during
4608          * receive processing
4609          */
4610         rcu_read_lock();
4611
4612         /*
4613          * Frames with failed FCS/PLCP checksum are not returned,
4614          * all other frames are returned without radiotap header
4615          * if it was previously present.
4616          * Also, frames with less than 16 bytes are dropped.
4617          */
4618         skb = ieee80211_rx_monitor(local, skb, rate);
4619         if (!skb) {
4620                 rcu_read_unlock();
4621                 return;
4622         }
4623
4624         ieee80211_tpt_led_trig_rx(local,
4625                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4626                         skb->len);
4627
4628         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4629
4630         rcu_read_unlock();
4631
4632         return;
4633  drop:
4634         kfree_skb(skb);
4635 }
4636 EXPORT_SYMBOL(ieee80211_rx_napi);
4637
4638 /* This is a version of the rx handler that can be called from hard irq
4639  * context. Post the skb on the queue and schedule the tasklet */
4640 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4641 {
4642         struct ieee80211_local *local = hw_to_local(hw);
4643
4644         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4645
4646         skb->pkt_type = IEEE80211_RX_MSG;
4647         skb_queue_tail(&local->skb_queue, skb);
4648         tasklet_schedule(&local->tasklet);
4649 }
4650 EXPORT_SYMBOL(ieee80211_rx_irqsafe);