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 - 2016 Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/jiffies.h>
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/export.h>
  22 #include <linux/bitops.h>
  23 #include <net/mac80211.h>
  24 #include <net/ieee80211_radiotap.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "led.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wpa.h"
  33 #include "tkip.h"
  34 #include "wme.h"
  35 #include "rate.h"
  36
  37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  38 {
  39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  40
  41         u64_stats_update_begin(&tstats->syncp);
  42         tstats->rx_packets++;
  43         tstats->rx_bytes += len;
  44         u64_stats_update_end(&tstats->syncp);
  45 }
  46
  47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  48                                enum nl80211_iftype type)
  49 {
  50         __le16 fc = hdr->frame_control;
  51
  52         if (ieee80211_is_data(fc)) {
  53                 if (len < 24) /* drop incorrect hdr len (data) */
  54                         return NULL;
  55
  56                 if (ieee80211_has_a4(fc))
  57                         return NULL;
  58                 if (ieee80211_has_tods(fc))
  59                         return hdr->addr1;
  60                 if (ieee80211_has_fromds(fc))
  61                         return hdr->addr2;
  62
  63                 return hdr->addr3;
  64         }
  65
  66         if (ieee80211_is_mgmt(fc)) {
  67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  68                         return NULL;
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_ctl(fc)) {
  73                 if (ieee80211_is_pspoll(fc))
  74                         return hdr->addr1;
  75
  76                 if (ieee80211_is_back_req(fc)) {
  77                         switch (type) {
  78                         case NL80211_IFTYPE_STATION:
  79                                 return hdr->addr2;
  80                         case NL80211_IFTYPE_AP:
  81                         case NL80211_IFTYPE_AP_VLAN:
  82                                 return hdr->addr1;
  83                         default:
  84                                 break; /* fall through to the return */
  85                         }
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 /*
  93  * monitor mode reception
  94  *
  95  * This function cleans up the SKB, i.e. it removes all the stuff
  96  * only useful for monitoring.
  97  */
  98 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  99                                            struct sk_buff *skb,
 100                                            unsigned int rtap_vendor_space)
 101 {
 102         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 103                 if (likely(skb->len > FCS_LEN))
 104                         __pskb_trim(skb, skb->len - FCS_LEN);
 105                 else {
 106                         /* driver bug */
 107                         WARN_ON(1);
 108                         dev_kfree_skb(skb);
 109                         return NULL;
 110                 }
 111         }
 112
 113         __pskb_pull(skb, rtap_vendor_space);
 114
 115         return skb;
 116 }
 117
 118 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 119                                      unsigned int rtap_vendor_space)
 120 {
 121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 122         struct ieee80211_hdr *hdr;
 123
 124         hdr = (void *)(skb->data + rtap_vendor_space);
 125
 126         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 127                             RX_FLAG_FAILED_PLCP_CRC |
 128                             RX_FLAG_ONLY_MONITOR))
 129                 return true;
 130
 131         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 132                 return true;
 133
 134         if (ieee80211_is_ctl(hdr->frame_control) &&
 135             !ieee80211_is_pspoll(hdr->frame_control) &&
 136             !ieee80211_is_back_req(hdr->frame_control))
 137                 return true;
 138
 139         return false;
 140 }
 141
 142 static int
 143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 144                              struct ieee80211_rx_status *status,
 145                              struct sk_buff *skb)
 146 {
 147         int len;
 148
 149         /* always present fields */
 150         len = sizeof(struct ieee80211_radiotap_header) + 8;
 151
 152         /* allocate extra bitmaps */
 153         if (status->chains)
 154                 len += 4 * hweight8(status->chains);
 155
 156         if (ieee80211_have_rx_timestamp(status)) {
 157                 len = ALIGN(len, 8);
 158                 len += 8;
 159         }
 160         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 161                 len += 1;
 162
 163         /* antenna field, if we don't have per-chain info */
 164         if (!status->chains)
 165                 len += 1;
 166
 167         /* padding for RX_FLAGS if necessary */
 168         len = ALIGN(len, 2);
 169
 170         if (status->flag & RX_FLAG_HT) /* HT info */
 171                 len += 3;
 172
 173         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 174                 len = ALIGN(len, 4);
 175                 len += 8;
 176         }
 177
 178         if (status->flag & RX_FLAG_VHT) {
 179                 len = ALIGN(len, 2);
 180                 len += 12;
 181         }
 182
 183         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 184                 len = ALIGN(len, 8);
 185                 len += 12;
 186         }
 187
 188         if (status->chains) {
 189                 /* antenna and antenna signal fields */
 190                 len += 2 * hweight8(status->chains);
 191         }
 192
 193         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 194                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 195
 196                 /* vendor presence bitmap */
 197                 len += 4;
 198                 /* alignment for fixed 6-byte vendor data header */
 199                 len = ALIGN(len, 2);
 200                 /* vendor data header */
 201                 len += 6;
 202                 if (WARN_ON(rtap->align == 0))
 203                         rtap->align = 1;
 204                 len = ALIGN(len, rtap->align);
 205                 len += rtap->len + rtap->pad;
 206         }
 207
 208         return len;
 209 }
 210
 211 /*
 212  * ieee80211_add_rx_radiotap_header - add radiotap header
 213  *
 214  * add a radiotap header containing all the fields which the hardware provided.
 215  */
 216 static void
 217 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 218                                  struct sk_buff *skb,
 219                                  struct ieee80211_rate *rate,
 220                                  int rtap_len, bool has_fcs)
 221 {
 222         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 223         struct ieee80211_radiotap_header *rthdr;
 224         unsigned char *pos;
 225         __le32 *it_present;
 226         u32 it_present_val;
 227         u16 rx_flags = 0;
 228         u16 channel_flags = 0;
 229         int mpdulen, chain;
 230         unsigned long chains = status->chains;
 231         struct ieee80211_vendor_radiotap rtap = {};
 232
 233         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 234                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 235                 /* rtap.len and rtap.pad are undone immediately */
 236                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 237         }
 238
 239         mpdulen = skb->len;
 240         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 241                 mpdulen += FCS_LEN;
 242
 243         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 244         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 245         it_present = &rthdr->it_present;
 246
 247         /* radiotap header, set always present flags */
 248         rthdr->it_len = cpu_to_le16(rtap_len);
 249         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 250                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 251                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 252
 253         if (!status->chains)
 254                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 255
 256         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 257                 it_present_val |=
 258                         BIT(IEEE80211_RADIOTAP_EXT) |
 259                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 260                 put_unaligned_le32(it_present_val, it_present);
 261                 it_present++;
 262                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 263                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 264         }
 265
 266         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 267                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 268                                   BIT(IEEE80211_RADIOTAP_EXT);
 269                 put_unaligned_le32(it_present_val, it_present);
 270                 it_present++;
 271                 it_present_val = rtap.present;
 272         }
 273
 274         put_unaligned_le32(it_present_val, it_present);
 275
 276         pos = (void *)(it_present + 1);
 277
 278         /* the order of the following fields is important */
 279
 280         /* IEEE80211_RADIOTAP_TSFT */
 281         if (ieee80211_have_rx_timestamp(status)) {
 282                 /* padding */
 283                 while ((pos - (u8 *)rthdr) & 7)
 284                         *pos++ = 0;
 285                 put_unaligned_le64(
 286                         ieee80211_calculate_rx_timestamp(local, status,
 287                                                          mpdulen, 0),
 288                         pos);
 289                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 290                 pos += 8;
 291         }
 292
 293         /* IEEE80211_RADIOTAP_FLAGS */
 294         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 295                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 296         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 297                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 298         if (status->flag & RX_FLAG_SHORTPRE)
 299                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 300         pos++;
 301
 302         /* IEEE80211_RADIOTAP_RATE */
 303         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 304                 /*
 305                  * Without rate information don't add it. If we have,
 306                  * MCS information is a separate field in radiotap,
 307                  * added below. The byte here is needed as padding
 308                  * for the channel though, so initialise it to 0.
 309                  */
 310                 *pos = 0;
 311         } else {
 312                 int shift = 0;
 313                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 314                 if (status->flag & RX_FLAG_10MHZ)
 315                         shift = 1;
 316                 else if (status->flag & RX_FLAG_5MHZ)
 317                         shift = 2;
 318                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 319         }
 320         pos++;
 321
 322         /* IEEE80211_RADIOTAP_CHANNEL */
 323         put_unaligned_le16(status->freq, pos);
 324         pos += 2;
 325         if (status->flag & RX_FLAG_10MHZ)
 326                 channel_flags |= IEEE80211_CHAN_HALF;
 327         else if (status->flag & RX_FLAG_5MHZ)
 328                 channel_flags |= IEEE80211_CHAN_QUARTER;
 329
 330         if (status->band == NL80211_BAND_5GHZ)
 331                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 332         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 333                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 334         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 335                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 336         else if (rate)
 337                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 338         else
 339                 channel_flags |= IEEE80211_CHAN_2GHZ;
 340         put_unaligned_le16(channel_flags, pos);
 341         pos += 2;
 342
 343         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 344         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 345             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 346                 *pos = status->signal;
 347                 rthdr->it_present |=
 348                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 349                 pos++;
 350         }
 351
 352         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 353
 354         if (!status->chains) {
 355                 /* IEEE80211_RADIOTAP_ANTENNA */
 356                 *pos = status->antenna;
 357                 pos++;
 358         }
 359
 360         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 361
 362         /* IEEE80211_RADIOTAP_RX_FLAGS */
 363         /* ensure 2 byte alignment for the 2 byte field as required */
 364         if ((pos - (u8 *)rthdr) & 1)
 365                 *pos++ = 0;
 366         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 367                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 368         put_unaligned_le16(rx_flags, pos);
 369         pos += 2;
 370
 371         if (status->flag & RX_FLAG_HT) {
 372                 unsigned int stbc;
 373
 374                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 375                 *pos++ = local->hw.radiotap_mcs_details;
 376                 *pos = 0;
 377                 if (status->flag & RX_FLAG_SHORT_GI)
 378                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 379                 if (status->flag & RX_FLAG_40MHZ)
 380                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 381                 if (status->flag & RX_FLAG_HT_GF)
 382                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 383                 if (status->flag & RX_FLAG_LDPC)
 384                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 385                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 386                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 387                 pos++;
 388                 *pos++ = status->rate_idx;
 389         }
 390
 391         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 392                 u16 flags = 0;
 393
 394                 /* ensure 4 byte alignment */
 395                 while ((pos - (u8 *)rthdr) & 3)
 396                         pos++;
 397                 rthdr->it_present |=
 398                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 399                 put_unaligned_le32(status->ampdu_reference, pos);
 400                 pos += 4;
 401                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 402                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 403                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 404                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 405                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 406                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 407                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 408                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 409                 put_unaligned_le16(flags, pos);
 410                 pos += 2;
 411                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 412                         *pos++ = status->ampdu_delimiter_crc;
 413                 else
 414                         *pos++ = 0;
 415                 *pos++ = 0;
 416         }
 417
 418         if (status->flag & RX_FLAG_VHT) {
 419                 u16 known = local->hw.radiotap_vht_details;
 420
 421                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 422                 put_unaligned_le16(known, pos);
 423                 pos += 2;
 424                 /* flags */
 425                 if (status->flag & RX_FLAG_SHORT_GI)
 426                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 427                 /* in VHT, STBC is binary */
 428                 if (status->flag & RX_FLAG_STBC_MASK)
 429                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 430                 if (status->vht_flag & RX_VHT_FLAG_BF)
 431                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 432                 pos++;
 433                 /* bandwidth */
 434                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 435                         *pos++ = 4;
 436                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 437                         *pos++ = 11;
 438                 else if (status->flag & RX_FLAG_40MHZ)
 439                         *pos++ = 1;
 440                 else /* 20 MHz */
 441                         *pos++ = 0;
 442                 /* MCS/NSS */
 443                 *pos = (status->rate_idx << 4) | status->vht_nss;
 444                 pos += 4;
 445                 /* coding field */
 446                 if (status->flag & RX_FLAG_LDPC)
 447                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 448                 pos++;
 449                 /* group ID */
 450                 pos++;
 451                 /* partial_aid */
 452                 pos += 2;
 453         }
 454
 455         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 456                 u16 accuracy = 0;
 457                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 458
 459                 rthdr->it_present |=
 460                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 461
 462                 /* ensure 8 byte alignment */
 463                 while ((pos - (u8 *)rthdr) & 7)
 464                         pos++;
 465
 466                 put_unaligned_le64(status->device_timestamp, pos);
 467                 pos += sizeof(u64);
 468
 469                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 470                         accuracy = local->hw.radiotap_timestamp.accuracy;
 471                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 472                 }
 473                 put_unaligned_le16(accuracy, pos);
 474                 pos += sizeof(u16);
 475
 476                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 477                 *pos++ = flags;
 478         }
 479
 480         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 481                 *pos++ = status->chain_signal[chain];
 482                 *pos++ = chain;
 483         }
 484
 485         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 486                 /* ensure 2 byte alignment for the vendor field as required */
 487                 if ((pos - (u8 *)rthdr) & 1)
 488                         *pos++ = 0;
 489                 *pos++ = rtap.oui[0];
 490                 *pos++ = rtap.oui[1];
 491                 *pos++ = rtap.oui[2];
 492                 *pos++ = rtap.subns;
 493                 put_unaligned_le16(rtap.len, pos);
 494                 pos += 2;
 495                 /* align the actual payload as requested */
 496                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 497                         *pos++ = 0;
 498                 /* data (and possible padding) already follows */
 499         }
 500 }
 501
 502 /*
 503  * This function copies a received frame to all monitor interfaces and
 504  * returns a cleaned-up SKB that no longer includes the FCS nor the
 505  * radiotap header the driver might have added.
 506  */
 507 static struct sk_buff *
 508 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 509                      struct ieee80211_rate *rate)
 510 {
 511         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 512         struct ieee80211_sub_if_data *sdata;
 513         int rt_hdrlen, needed_headroom;
 514         struct sk_buff *skb, *skb2;
 515         struct net_device *prev_dev = NULL;
 516         int present_fcs_len = 0;
 517         unsigned int rtap_vendor_space = 0;
 518         struct ieee80211_mgmt *mgmt;
 519         struct ieee80211_sub_if_data *monitor_sdata =
 520                 rcu_dereference(local->monitor_sdata);
 521
 522         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 523                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 524
 525                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 526         }
 527
 528         /*
 529          * First, we may need to make a copy of the skb because
 530          *  (1) we need to modify it for radiotap (if not present), and
 531          *  (2) the other RX handlers will modify the skb we got.
 532          *
 533          * We don't need to, of course, if we aren't going to return
 534          * the SKB because it has a bad FCS/PLCP checksum.
 535          */
 536
 537         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 538                 present_fcs_len = FCS_LEN;
 539
 540         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 541         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 542                 dev_kfree_skb(origskb);
 543                 return NULL;
 544         }
 545
 546         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 547                 if (should_drop_frame(origskb, present_fcs_len,
 548                                       rtap_vendor_space)) {
 549                         dev_kfree_skb(origskb);
 550                         return NULL;
 551                 }
 552
 553                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 554         }
 555
 556         /* room for the radiotap header based on driver features */
 557         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 558         needed_headroom = rt_hdrlen - rtap_vendor_space;
 559
 560         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 561                 /* only need to expand headroom if necessary */
 562                 skb = origskb;
 563                 origskb = NULL;
 564
 565                 /*
 566                  * This shouldn't trigger often because most devices have an
 567                  * RX header they pull before we get here, and that should
 568                  * be big enough for our radiotap information. We should
 569                  * probably export the length to drivers so that we can have
 570                  * them allocate enough headroom to start with.
 571                  */
 572                 if (skb_headroom(skb) < needed_headroom &&
 573                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 574                         dev_kfree_skb(skb);
 575                         return NULL;
 576                 }
 577         } else {
 578                 /*
 579                  * Need to make a copy and possibly remove radiotap header
 580                  * and FCS from the original.
 581                  */
 582                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 583
 584                 origskb = remove_monitor_info(local, origskb,
 585                                               rtap_vendor_space);
 586
 587                 if (!skb)
 588                         return origskb;
 589         }
 590
 591         /* prepend radiotap information */
 592         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 593
 594         skb_reset_mac_header(skb);
 595         skb->ip_summed = CHECKSUM_UNNECESSARY;
 596         skb->pkt_type = PACKET_OTHERHOST;
 597         skb->protocol = htons(ETH_P_802_2);
 598
 599         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 600                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 601                         continue;
 602
 603                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 604                         continue;
 605
 606                 if (!ieee80211_sdata_running(sdata))
 607                         continue;
 608
 609                 if (prev_dev) {
 610                         skb2 = skb_clone(skb, GFP_ATOMIC);
 611                         if (skb2) {
 612                                 skb2->dev = prev_dev;
 613                                 netif_receive_skb(skb2);
 614                         }
 615                 }
 616
 617                 prev_dev = sdata->dev;
 618                 ieee80211_rx_stats(sdata->dev, skb->len);
 619         }
 620
 621         mgmt = (void *)skb->data;
 622         if (monitor_sdata &&
 623             skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
 624             ieee80211_is_action(mgmt->frame_control) &&
 625             mgmt->u.action.category == WLAN_CATEGORY_VHT &&
 626             mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
 627             is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
 628             ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
 629                 struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
 630
 631                 if (mu_skb) {
 632                         mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 633                         skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
 634                         ieee80211_queue_work(&local->hw, &monitor_sdata->work);
 635                 }
 636         }
 637
 638         if (prev_dev) {
 639                 skb->dev = prev_dev;
 640                 netif_receive_skb(skb);
 641         } else
 642                 dev_kfree_skb(skb);
 643
 644         return origskb;
 645 }
 646
 647 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 648 {
 649         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 650         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 651         int tid, seqno_idx, security_idx;
 652
 653         /* does the frame have a qos control field? */
 654         if (ieee80211_is_data_qos(hdr->frame_control)) {
 655                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 656                 /* frame has qos control */
 657                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 658                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 659                         status->rx_flags |= IEEE80211_RX_AMSDU;
 660
 661                 seqno_idx = tid;
 662                 security_idx = tid;
 663         } else {
 664                 /*
 665                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 666                  *
 667                  *      Sequence numbers for management frames, QoS data
 668                  *      frames with a broadcast/multicast address in the
 669                  *      Address 1 field, and all non-QoS data frames sent
 670                  *      by QoS STAs are assigned using an additional single
 671                  *      modulo-4096 counter, [...]
 672                  *
 673                  * We also use that counter for non-QoS STAs.
 674                  */
 675                 seqno_idx = IEEE80211_NUM_TIDS;
 676                 security_idx = 0;
 677                 if (ieee80211_is_mgmt(hdr->frame_control))
 678                         security_idx = IEEE80211_NUM_TIDS;
 679                 tid = 0;
 680         }
 681
 682         rx->seqno_idx = seqno_idx;
 683         rx->security_idx = security_idx;
 684         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 685          * For now, set skb->priority to 0 for other cases. */
 686         rx->skb->priority = (tid > 7) ? 0 : tid;
 687 }
 688
 689 /**
 690  * DOC: Packet alignment
 691  *
 692  * Drivers always need to pass packets that are aligned to two-byte boundaries
 693  * to the stack.
 694  *
 695  * Additionally, should, if possible, align the payload data in a way that
 696  * guarantees that the contained IP header is aligned to a four-byte
 697  * boundary. In the case of regular frames, this simply means aligning the
 698  * payload to a four-byte boundary (because either the IP header is directly
 699  * contained, or IV/RFC1042 headers that have a length divisible by four are
 700  * in front of it).  If the payload data is not properly aligned and the
 701  * architecture doesn't support efficient unaligned operations, mac80211
 702  * will align the data.
 703  *
 704  * With A-MSDU frames, however, the payload data address must yield two modulo
 705  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 706  * push the IP header further back to a multiple of four again. Thankfully, the
 707  * specs were sane enough this time around to require padding each A-MSDU
 708  * subframe to a length that is a multiple of four.
 709  *
 710  * Padding like Atheros hardware adds which is between the 802.11 header and
 711  * the payload is not supported, the driver is required to move the 802.11
 712  * header to be directly in front of the payload in that case.
 713  */
 714 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 715 {
 716 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 717         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 718 #endif
 719 }
 720
 721
 722 /* rx handlers */
 723
 724 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 725 {
 726         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 727
 728         if (is_multicast_ether_addr(hdr->addr1))
 729                 return 0;
 730
 731         return ieee80211_is_robust_mgmt_frame(skb);
 732 }
 733
 734
 735 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 736 {
 737         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 738
 739         if (!is_multicast_ether_addr(hdr->addr1))
 740                 return 0;
 741
 742         return ieee80211_is_robust_mgmt_frame(skb);
 743 }
 744
 745
 746 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 747 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 748 {
 749         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 750         struct ieee80211_mmie *mmie;
 751         struct ieee80211_mmie_16 *mmie16;
 752
 753         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 754                 return -1;
 755
 756         if (!ieee80211_is_robust_mgmt_frame(skb))
 757                 return -1; /* not a robust management frame */
 758
 759         mmie = (struct ieee80211_mmie *)
 760                 (skb->data + skb->len - sizeof(*mmie));
 761         if (mmie->element_id == WLAN_EID_MMIE &&
 762             mmie->length == sizeof(*mmie) - 2)
 763                 return le16_to_cpu(mmie->key_id);
 764
 765         mmie16 = (struct ieee80211_mmie_16 *)
 766                 (skb->data + skb->len - sizeof(*mmie16));
 767         if (skb->len >= 24 + sizeof(*mmie16) &&
 768             mmie16->element_id == WLAN_EID_MMIE &&
 769             mmie16->length == sizeof(*mmie16) - 2)
 770                 return le16_to_cpu(mmie16->key_id);
 771
 772         return -1;
 773 }
 774
 775 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 776                                   struct sk_buff *skb)
 777 {
 778         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 779         __le16 fc;
 780         int hdrlen;
 781         u8 keyid;
 782
 783         fc = hdr->frame_control;
 784         hdrlen = ieee80211_hdrlen(fc);
 785
 786         if (skb->len < hdrlen + cs->hdr_len)
 787                 return -EINVAL;
 788
 789         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 790         keyid &= cs->key_idx_mask;
 791         keyid >>= cs->key_idx_shift;
 792
 793         return keyid;
 794 }
 795
 796 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 797 {
 798         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 799         char *dev_addr = rx->sdata->vif.addr;
 800
 801         if (ieee80211_is_data(hdr->frame_control)) {
 802                 if (is_multicast_ether_addr(hdr->addr1)) {
 803                         if (ieee80211_has_tods(hdr->frame_control) ||
 804                             !ieee80211_has_fromds(hdr->frame_control))
 805                                 return RX_DROP_MONITOR;
 806                         if (ether_addr_equal(hdr->addr3, dev_addr))
 807                                 return RX_DROP_MONITOR;
 808                 } else {
 809                         if (!ieee80211_has_a4(hdr->frame_control))
 810                                 return RX_DROP_MONITOR;
 811                         if (ether_addr_equal(hdr->addr4, dev_addr))
 812                                 return RX_DROP_MONITOR;
 813                 }
 814         }
 815
 816         /* If there is not an established peer link and this is not a peer link
 817          * establisment frame, beacon or probe, drop the frame.
 818          */
 819
 820         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 821                 struct ieee80211_mgmt *mgmt;
 822
 823                 if (!ieee80211_is_mgmt(hdr->frame_control))
 824                         return RX_DROP_MONITOR;
 825
 826                 if (ieee80211_is_action(hdr->frame_control)) {
 827                         u8 category;
 828
 829                         /* make sure category field is present */
 830                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 831                                 return RX_DROP_MONITOR;
 832
 833                         mgmt = (struct ieee80211_mgmt *)hdr;
 834                         category = mgmt->u.action.category;
 835                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 836                             category != WLAN_CATEGORY_SELF_PROTECTED)
 837                                 return RX_DROP_MONITOR;
 838                         return RX_CONTINUE;
 839                 }
 840
 841                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 842                     ieee80211_is_probe_resp(hdr->frame_control) ||
 843                     ieee80211_is_beacon(hdr->frame_control) ||
 844                     ieee80211_is_auth(hdr->frame_control))
 845                         return RX_CONTINUE;
 846
 847                 return RX_DROP_MONITOR;
 848         }
 849
 850         return RX_CONTINUE;
 851 }
 852
 853 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 854                                               int index)
 855 {
 856         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 857         struct sk_buff *tail = skb_peek_tail(frames);
 858         struct ieee80211_rx_status *status;
 859
 860         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 861                 return true;
 862
 863         if (!tail)
 864                 return false;
 865
 866         status = IEEE80211_SKB_RXCB(tail);
 867         if (status->flag & RX_FLAG_AMSDU_MORE)
 868                 return false;
 869
 870         return true;
 871 }
 872
 873 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 874                                             struct tid_ampdu_rx *tid_agg_rx,
 875                                             int index,
 876                                             struct sk_buff_head *frames)
 877 {
 878         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 879         struct sk_buff *skb;
 880         struct ieee80211_rx_status *status;
 881
 882         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 883
 884         if (skb_queue_empty(skb_list))
 885                 goto no_frame;
 886
 887         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 888                 __skb_queue_purge(skb_list);
 889                 goto no_frame;
 890         }
 891
 892         /* release frames from the reorder ring buffer */
 893         tid_agg_rx->stored_mpdu_num--;
 894         while ((skb = __skb_dequeue(skb_list))) {
 895                 status = IEEE80211_SKB_RXCB(skb);
 896                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 897                 __skb_queue_tail(frames, skb);
 898         }
 899
 900 no_frame:
 901         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 902         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 903 }
 904
 905 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 906                                              struct tid_ampdu_rx *tid_agg_rx,
 907                                              u16 head_seq_num,
 908                                              struct sk_buff_head *frames)
 909 {
 910         int index;
 911
 912         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 913
 914         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 915                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 916                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 917                                                 frames);
 918         }
 919 }
 920
 921 /*
 922  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 923  * the skb was added to the buffer longer than this time ago, the earlier
 924  * frames that have not yet been received are assumed to be lost and the skb
 925  * can be released for processing. This may also release other skb's from the
 926  * reorder buffer if there are no additional gaps between the frames.
 927  *
 928  * Callers must hold tid_agg_rx->reorder_lock.
 929  */
 930 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 931
 932 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 933                                           struct tid_ampdu_rx *tid_agg_rx,
 934                                           struct sk_buff_head *frames)
 935 {
 936         int index, i, j;
 937
 938         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 939
 940         /* release the buffer until next missing frame */
 941         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 942         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 943             tid_agg_rx->stored_mpdu_num) {
 944                 /*
 945                  * No buffers ready to be released, but check whether any
 946                  * frames in the reorder buffer have timed out.
 947                  */
 948                 int skipped = 1;
 949                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 950                      j = (j + 1) % tid_agg_rx->buf_size) {
 951                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
 952                                 skipped++;
 953                                 continue;
 954                         }
 955                         if (skipped &&
 956                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 957                                         HT_RX_REORDER_BUF_TIMEOUT))
 958                                 goto set_release_timer;
 959
 960                         /* don't leave incomplete A-MSDUs around */
 961                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 962                              i = (i + 1) % tid_agg_rx->buf_size)
 963                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 964
 965                         ht_dbg_ratelimited(sdata,
 966                                            "release an RX reorder frame due to timeout on earlier frames\n");
 967                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 968                                                         frames);
 969
 970                         /*
 971                          * Increment the head seq# also for the skipped slots.
 972                          */
 973                         tid_agg_rx->head_seq_num =
 974                                 (tid_agg_rx->head_seq_num +
 975                                  skipped) & IEEE80211_SN_MASK;
 976                         skipped = 0;
 977                 }
 978         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 979                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 980                                                 frames);
 981                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 982         }
 983
 984         if (tid_agg_rx->stored_mpdu_num) {
 985                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 986
 987                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 988                      j = (j + 1) % tid_agg_rx->buf_size) {
 989                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
 990                                 break;
 991                 }
 992
 993  set_release_timer:
 994
 995                 if (!tid_agg_rx->removed)
 996                         mod_timer(&tid_agg_rx->reorder_timer,
 997                                   tid_agg_rx->reorder_time[j] + 1 +
 998                                   HT_RX_REORDER_BUF_TIMEOUT);
 999         } else {
1000                 del_timer(&tid_agg_rx->reorder_timer);
1001         }
1002 }
1003
1004 /*
1005  * As this function belongs to the RX path it must be under
1006  * rcu_read_lock protection. It returns false if the frame
1007  * can be processed immediately, true if it was consumed.
1008  */
1009 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1010                                              struct tid_ampdu_rx *tid_agg_rx,
1011                                              struct sk_buff *skb,
1012                                              struct sk_buff_head *frames)
1013 {
1014         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1015         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1017         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1018         u16 head_seq_num, buf_size;
1019         int index;
1020         bool ret = true;
1021
1022         spin_lock(&tid_agg_rx->reorder_lock);
1023
1024         /*
1025          * Offloaded BA sessions have no known starting sequence number so pick
1026          * one from first Rxed frame for this tid after BA was started.
1027          */
1028         if (unlikely(tid_agg_rx->auto_seq)) {
1029                 tid_agg_rx->auto_seq = false;
1030                 tid_agg_rx->ssn = mpdu_seq_num;
1031                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1032         }
1033
1034         buf_size = tid_agg_rx->buf_size;
1035         head_seq_num = tid_agg_rx->head_seq_num;
1036
1037         /* frame with out of date sequence number */
1038         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1039                 dev_kfree_skb(skb);
1040                 goto out;
1041         }
1042
1043         /*
1044          * If frame the sequence number exceeds our buffering window
1045          * size release some previous frames to make room for this one.
1046          */
1047         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1048                 head_seq_num = ieee80211_sn_inc(
1049                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1050                 /* release stored frames up to new head to stack */
1051                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1052                                                  head_seq_num, frames);
1053         }
1054
1055         /* Now the new frame is always in the range of the reordering buffer */
1056
1057         index = mpdu_seq_num % tid_agg_rx->buf_size;
1058
1059         /* check if we already stored this frame */
1060         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1061                 dev_kfree_skb(skb);
1062                 goto out;
1063         }
1064
1065         /*
1066          * If the current MPDU is in the right order and nothing else
1067          * is stored we can process it directly, no need to buffer it.
1068          * If it is first but there's something stored, we may be able
1069          * to release frames after this one.
1070          */
1071         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1072             tid_agg_rx->stored_mpdu_num == 0) {
1073                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1074                         tid_agg_rx->head_seq_num =
1075                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1076                 ret = false;
1077                 goto out;
1078         }
1079
1080         /* put the frame in the reordering buffer */
1081         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1082         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1083                 tid_agg_rx->reorder_time[index] = jiffies;
1084                 tid_agg_rx->stored_mpdu_num++;
1085                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1086         }
1087
1088  out:
1089         spin_unlock(&tid_agg_rx->reorder_lock);
1090         return ret;
1091 }
1092
1093 /*
1094  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095  * true if the MPDU was buffered, false if it should be processed.
1096  */
1097 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1098                                        struct sk_buff_head *frames)
1099 {
1100         struct sk_buff *skb = rx->skb;
1101         struct ieee80211_local *local = rx->local;
1102         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1103         struct sta_info *sta = rx->sta;
1104         struct tid_ampdu_rx *tid_agg_rx;
1105         u16 sc;
1106         u8 tid, ack_policy;
1107
1108         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1109             is_multicast_ether_addr(hdr->addr1))
1110                 goto dont_reorder;
1111
1112         /*
1113          * filter the QoS data rx stream according to
1114          * STA/TID and check if this STA/TID is on aggregation
1115          */
1116
1117         if (!sta)
1118                 goto dont_reorder;
1119
1120         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1121                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1122         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1123
1124         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1125         if (!tid_agg_rx) {
1126                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1127                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1128                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1129                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1130                                              WLAN_BACK_RECIPIENT,
1131                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1132                 goto dont_reorder;
1133         }
1134
1135         /* qos null data frames are excluded */
1136         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1137                 goto dont_reorder;
1138
1139         /* not part of a BA session */
1140         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1141             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1142                 goto dont_reorder;
1143
1144         /* new, potentially un-ordered, ampdu frame - process it */
1145
1146         /* reset session timer */
1147         if (tid_agg_rx->timeout)
1148                 tid_agg_rx->last_rx = jiffies;
1149
1150         /* if this mpdu is fragmented - terminate rx aggregation session */
1151         sc = le16_to_cpu(hdr->seq_ctrl);
1152         if (sc & IEEE80211_SCTL_FRAG) {
1153                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1154                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1155                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1156                 return;
1157         }
1158
1159         /*
1160          * No locking needed -- we will only ever process one
1161          * RX packet at a time, and thus own tid_agg_rx. All
1162          * other code manipulating it needs to (and does) make
1163          * sure that we cannot get to it any more before doing
1164          * anything with it.
1165          */
1166         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1167                                              frames))
1168                 return;
1169
1170  dont_reorder:
1171         __skb_queue_tail(frames, skb);
1172 }
1173
1174 static ieee80211_rx_result debug_noinline
1175 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1176 {
1177         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1178         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1179
1180         if (status->flag & RX_FLAG_DUP_VALIDATED)
1181                 return RX_CONTINUE;
1182
1183         /*
1184          * Drop duplicate 802.11 retransmissions
1185          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1186          */
1187
1188         if (rx->skb->len < 24)
1189                 return RX_CONTINUE;
1190
1191         if (ieee80211_is_ctl(hdr->frame_control) ||
1192             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1193             is_multicast_ether_addr(hdr->addr1))
1194                 return RX_CONTINUE;
1195
1196         if (!rx->sta)
1197                 return RX_CONTINUE;
1198
1199         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1200                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1201                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1202                 rx->sta->rx_stats.num_duplicates++;
1203                 return RX_DROP_UNUSABLE;
1204         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1205                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1206         }
1207
1208         return RX_CONTINUE;
1209 }
1210
1211 static ieee80211_rx_result debug_noinline
1212 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1213 {
1214         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1215
1216         /* Drop disallowed frame classes based on STA auth/assoc state;
1217          * IEEE 802.11, Chap 5.5.
1218          *
1219          * mac80211 filters only based on association state, i.e. it drops
1220          * Class 3 frames from not associated stations. hostapd sends
1221          * deauth/disassoc frames when needed. In addition, hostapd is
1222          * responsible for filtering on both auth and assoc states.
1223          */
1224
1225         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1226                 return ieee80211_rx_mesh_check(rx);
1227
1228         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1229                       ieee80211_is_pspoll(hdr->frame_control)) &&
1230                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1231                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1232                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1233                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1234                 /*
1235                  * accept port control frames from the AP even when it's not
1236                  * yet marked ASSOC to prevent a race where we don't set the
1237                  * assoc bit quickly enough before it sends the first frame
1238                  */
1239                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1240                     ieee80211_is_data_present(hdr->frame_control)) {
1241                         unsigned int hdrlen;
1242                         __be16 ethertype;
1243
1244                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1245
1246                         if (rx->skb->len < hdrlen + 8)
1247                                 return RX_DROP_MONITOR;
1248
1249                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1250                         if (ethertype == rx->sdata->control_port_protocol)
1251                                 return RX_CONTINUE;
1252                 }
1253
1254                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1255                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1256                                                hdr->addr2,
1257                                                GFP_ATOMIC))
1258                         return RX_DROP_UNUSABLE;
1259
1260                 return RX_DROP_MONITOR;
1261         }
1262
1263         return RX_CONTINUE;
1264 }
1265
1266
1267 static ieee80211_rx_result debug_noinline
1268 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1269 {
1270         struct ieee80211_local *local;
1271         struct ieee80211_hdr *hdr;
1272         struct sk_buff *skb;
1273
1274         local = rx->local;
1275         skb = rx->skb;
1276         hdr = (struct ieee80211_hdr *) skb->data;
1277
1278         if (!local->pspolling)
1279                 return RX_CONTINUE;
1280
1281         if (!ieee80211_has_fromds(hdr->frame_control))
1282                 /* this is not from AP */
1283                 return RX_CONTINUE;
1284
1285         if (!ieee80211_is_data(hdr->frame_control))
1286                 return RX_CONTINUE;
1287
1288         if (!ieee80211_has_moredata(hdr->frame_control)) {
1289                 /* AP has no more frames buffered for us */
1290                 local->pspolling = false;
1291                 return RX_CONTINUE;
1292         }
1293
1294         /* more data bit is set, let's request a new frame from the AP */
1295         ieee80211_send_pspoll(local, rx->sdata);
1296
1297         return RX_CONTINUE;
1298 }
1299
1300 static void sta_ps_start(struct sta_info *sta)
1301 {
1302         struct ieee80211_sub_if_data *sdata = sta->sdata;
1303         struct ieee80211_local *local = sdata->local;
1304         struct ps_data *ps;
1305         int tid;
1306
1307         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1308             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1309                 ps = &sdata->bss->ps;
1310         else
1311                 return;
1312
1313         atomic_inc(&ps->num_sta_ps);
1314         set_sta_flag(sta, WLAN_STA_PS_STA);
1315         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1316                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1317         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1318                sta->sta.addr, sta->sta.aid);
1319
1320         ieee80211_clear_fast_xmit(sta);
1321
1322         if (!sta->sta.txq[0])
1323                 return;
1324
1325         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1326                 if (txq_has_queue(sta->sta.txq[tid]))
1327                         set_bit(tid, &sta->txq_buffered_tids);
1328                 else
1329                         clear_bit(tid, &sta->txq_buffered_tids);
1330         }
1331 }
1332
1333 static void sta_ps_end(struct sta_info *sta)
1334 {
1335         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1336                sta->sta.addr, sta->sta.aid);
1337
1338         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1339                 /*
1340                  * Clear the flag only if the other one is still set
1341                  * so that the TX path won't start TX'ing new frames
1342                  * directly ... In the case that the driver flag isn't
1343                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1344                  */
1345                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1346                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1347                        sta->sta.addr, sta->sta.aid);
1348                 return;
1349         }
1350
1351         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1352         clear_sta_flag(sta, WLAN_STA_PS_STA);
1353         ieee80211_sta_ps_deliver_wakeup(sta);
1354 }
1355
1356 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1357 {
1358         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1359         bool in_ps;
1360
1361         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1362
1363         /* Don't let the same PS state be set twice */
1364         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1365         if ((start && in_ps) || (!start && !in_ps))
1366                 return -EINVAL;
1367
1368         if (start)
1369                 sta_ps_start(sta);
1370         else
1371                 sta_ps_end(sta);
1372
1373         return 0;
1374 }
1375 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1376
1377 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1378 {
1379         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1380
1381         if (test_sta_flag(sta, WLAN_STA_SP))
1382                 return;
1383
1384         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1385                 ieee80211_sta_ps_deliver_poll_response(sta);
1386         else
1387                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1388 }
1389 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1390
1391 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1392 {
1393         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1394         u8 ac = ieee802_1d_to_ac[tid & 7];
1395
1396         /*
1397          * If this AC is not trigger-enabled do nothing unless the
1398          * driver is calling us after it already checked.
1399          *
1400          * NB: This could/should check a separate bitmap of trigger-
1401          * enabled queues, but for now we only implement uAPSD w/o
1402          * TSPEC changes to the ACs, so they're always the same.
1403          */
1404         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1405             tid != IEEE80211_NUM_TIDS)
1406                 return;
1407
1408         /* if we are in a service period, do nothing */
1409         if (test_sta_flag(sta, WLAN_STA_SP))
1410                 return;
1411
1412         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1413                 ieee80211_sta_ps_deliver_uapsd(sta);
1414         else
1415                 set_sta_flag(sta, WLAN_STA_UAPSD);
1416 }
1417 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1418
1419 static ieee80211_rx_result debug_noinline
1420 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1421 {
1422         struct ieee80211_sub_if_data *sdata = rx->sdata;
1423         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1424         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1425
1426         if (!rx->sta)
1427                 return RX_CONTINUE;
1428
1429         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1430             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1431                 return RX_CONTINUE;
1432
1433         /*
1434          * The device handles station powersave, so don't do anything about
1435          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1436          * it to mac80211 since they're handled.)
1437          */
1438         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1439                 return RX_CONTINUE;
1440
1441         /*
1442          * Don't do anything if the station isn't already asleep. In
1443          * the uAPSD case, the station will probably be marked asleep,
1444          * in the PS-Poll case the station must be confused ...
1445          */
1446         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1447                 return RX_CONTINUE;
1448
1449         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1450                 ieee80211_sta_pspoll(&rx->sta->sta);
1451
1452                 /* Free PS Poll skb here instead of returning RX_DROP that would
1453                  * count as an dropped frame. */
1454                 dev_kfree_skb(rx->skb);
1455
1456                 return RX_QUEUED;
1457         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1458                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1459                    ieee80211_has_pm(hdr->frame_control) &&
1460                    (ieee80211_is_data_qos(hdr->frame_control) ||
1461                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1462                 u8 tid;
1463
1464                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1465
1466                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1467         }
1468
1469         return RX_CONTINUE;
1470 }
1471
1472 static ieee80211_rx_result debug_noinline
1473 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1474 {
1475         struct sta_info *sta = rx->sta;
1476         struct sk_buff *skb = rx->skb;
1477         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1478         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1479         int i;
1480
1481         if (!sta)
1482                 return RX_CONTINUE;
1483
1484         /*
1485          * Update last_rx only for IBSS packets which are for the current
1486          * BSSID and for station already AUTHORIZED to avoid keeping the
1487          * current IBSS network alive in cases where other STAs start
1488          * using different BSSID. This will also give the station another
1489          * chance to restart the authentication/authorization in case
1490          * something went wrong the first time.
1491          */
1492         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1493                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1494                                                 NL80211_IFTYPE_ADHOC);
1495                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1496                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1497                         sta->rx_stats.last_rx = jiffies;
1498                         if (ieee80211_is_data(hdr->frame_control) &&
1499                             !is_multicast_ether_addr(hdr->addr1))
1500                                 sta->rx_stats.last_rate =
1501                                         sta_stats_encode_rate(status);
1502                 }
1503         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1504                 sta->rx_stats.last_rx = jiffies;
1505         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1506                 /*
1507                  * Mesh beacons will update last_rx when if they are found to
1508                  * match the current local configuration when processed.
1509                  */
1510                 sta->rx_stats.last_rx = jiffies;
1511                 if (ieee80211_is_data(hdr->frame_control))
1512                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1513         }
1514
1515         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1516                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1517
1518         sta->rx_stats.fragments++;
1519
1520         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1521         sta->rx_stats.bytes += rx->skb->len;
1522         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1523
1524         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1525                 sta->rx_stats.last_signal = status->signal;
1526                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1527         }
1528
1529         if (status->chains) {
1530                 sta->rx_stats.chains = status->chains;
1531                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1532                         int signal = status->chain_signal[i];
1533
1534                         if (!(status->chains & BIT(i)))
1535                                 continue;
1536
1537                         sta->rx_stats.chain_signal_last[i] = signal;
1538                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1539                                         -signal);
1540                 }
1541         }
1542
1543         /*
1544          * Change STA power saving mode only at the end of a frame
1545          * exchange sequence.
1546          */
1547         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1548             !ieee80211_has_morefrags(hdr->frame_control) &&
1549             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1550             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1551              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1552             /* PM bit is only checked in frames where it isn't reserved,
1553              * in AP mode it's reserved in non-bufferable management frames
1554              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1555              */
1556             (!ieee80211_is_mgmt(hdr->frame_control) ||
1557              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1558                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1559                         if (!ieee80211_has_pm(hdr->frame_control))
1560                                 sta_ps_end(sta);
1561                 } else {
1562                         if (ieee80211_has_pm(hdr->frame_control))
1563                                 sta_ps_start(sta);
1564                 }
1565         }
1566
1567         /* mesh power save support */
1568         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1569                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1570
1571         /*
1572          * Drop (qos-)data::nullfunc frames silently, since they
1573          * are used only to control station power saving mode.
1574          */
1575         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1576             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1577                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1578
1579                 /*
1580                  * If we receive a 4-addr nullfunc frame from a STA
1581                  * that was not moved to a 4-addr STA vlan yet send
1582                  * the event to userspace and for older hostapd drop
1583                  * the frame to the monitor interface.
1584                  */
1585                 if (ieee80211_has_a4(hdr->frame_control) &&
1586                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1587                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1588                       !rx->sdata->u.vlan.sta))) {
1589                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1590                                 cfg80211_rx_unexpected_4addr_frame(
1591                                         rx->sdata->dev, sta->sta.addr,
1592                                         GFP_ATOMIC);
1593                         return RX_DROP_MONITOR;
1594                 }
1595                 /*
1596                  * Update counter and free packet here to avoid
1597                  * counting this as a dropped packed.
1598                  */
1599                 sta->rx_stats.packets++;
1600                 dev_kfree_skb(rx->skb);
1601                 return RX_QUEUED;
1602         }
1603
1604         return RX_CONTINUE;
1605 } /* ieee80211_rx_h_sta_process */
1606
1607 static ieee80211_rx_result debug_noinline
1608 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1609 {
1610         struct sk_buff *skb = rx->skb;
1611         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1612         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1613         int keyidx;
1614         int hdrlen;
1615         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1616         struct ieee80211_key *sta_ptk = NULL;
1617         int mmie_keyidx = -1;
1618         __le16 fc;
1619         const struct ieee80211_cipher_scheme *cs = NULL;
1620
1621         /*
1622          * Key selection 101
1623          *
1624          * There are four types of keys:
1625          *  - GTK (group keys)
1626          *  - IGTK (group keys for management frames)
1627          *  - PTK (pairwise keys)
1628          *  - STK (station-to-station pairwise keys)
1629          *
1630          * When selecting a key, we have to distinguish between multicast
1631          * (including broadcast) and unicast frames, the latter can only
1632          * use PTKs and STKs while the former always use GTKs and IGTKs.
1633          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1634          * unicast frames can also use key indices like GTKs. Hence, if we
1635          * don't have a PTK/STK we check the key index for a WEP key.
1636          *
1637          * Note that in a regular BSS, multicast frames are sent by the
1638          * AP only, associated stations unicast the frame to the AP first
1639          * which then multicasts it on their behalf.
1640          *
1641          * There is also a slight problem in IBSS mode: GTKs are negotiated
1642          * with each station, that is something we don't currently handle.
1643          * The spec seems to expect that one negotiates the same key with
1644          * every station but there's no such requirement; VLANs could be
1645          * possible.
1646          */
1647
1648         /* start without a key */
1649         rx->key = NULL;
1650         fc = hdr->frame_control;
1651
1652         if (rx->sta) {
1653                 int keyid = rx->sta->ptk_idx;
1654
1655                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1656                         cs = rx->sta->cipher_scheme;
1657                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1658                         if (unlikely(keyid < 0))
1659                                 return RX_DROP_UNUSABLE;
1660                 }
1661                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1662         }
1663
1664         if (!ieee80211_has_protected(fc))
1665                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1666
1667         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1668                 rx->key = sta_ptk;
1669                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1670                     (status->flag & RX_FLAG_IV_STRIPPED))
1671                         return RX_CONTINUE;
1672                 /* Skip decryption if the frame is not protected. */
1673                 if (!ieee80211_has_protected(fc))
1674                         return RX_CONTINUE;
1675         } else if (mmie_keyidx >= 0) {
1676                 /* Broadcast/multicast robust management frame / BIP */
1677                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1678                     (status->flag & RX_FLAG_IV_STRIPPED))
1679                         return RX_CONTINUE;
1680
1681                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1682                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1683                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1684                 if (rx->sta) {
1685                         if (ieee80211_is_group_privacy_action(skb) &&
1686                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1687                                 return RX_DROP_MONITOR;
1688
1689                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1690                 }
1691                 if (!rx->key)
1692                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1693         } else if (!ieee80211_has_protected(fc)) {
1694                 /*
1695                  * The frame was not protected, so skip decryption. However, we
1696                  * need to set rx->key if there is a key that could have been
1697                  * used so that the frame may be dropped if encryption would
1698                  * have been expected.
1699                  */
1700                 struct ieee80211_key *key = NULL;
1701                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1702                 int i;
1703
1704                 if (ieee80211_is_mgmt(fc) &&
1705                     is_multicast_ether_addr(hdr->addr1) &&
1706                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1707                         rx->key = key;
1708                 else {
1709                         if (rx->sta) {
1710                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1711                                         key = rcu_dereference(rx->sta->gtk[i]);
1712                                         if (key)
1713                                                 break;
1714                                 }
1715                         }
1716                         if (!key) {
1717                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1718                                         key = rcu_dereference(sdata->keys[i]);
1719                                         if (key)
1720                                                 break;
1721                                 }
1722                         }
1723                         if (key)
1724                                 rx->key = key;
1725                 }
1726                 return RX_CONTINUE;
1727         } else {
1728                 u8 keyid;
1729
1730                 /*
1731                  * The device doesn't give us the IV so we won't be
1732                  * able to look up the key. That's ok though, we
1733                  * don't need to decrypt the frame, we just won't
1734                  * be able to keep statistics accurate.
1735                  * Except for key threshold notifications, should
1736                  * we somehow allow the driver to tell us which key
1737                  * the hardware used if this flag is set?
1738                  */
1739                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1740                     (status->flag & RX_FLAG_IV_STRIPPED))
1741                         return RX_CONTINUE;
1742
1743                 hdrlen = ieee80211_hdrlen(fc);
1744
1745                 if (cs) {
1746                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1747
1748                         if (unlikely(keyidx < 0))
1749                                 return RX_DROP_UNUSABLE;
1750                 } else {
1751                         if (rx->skb->len < 8 + hdrlen)
1752                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1753                         /*
1754                          * no need to call ieee80211_wep_get_keyidx,
1755                          * it verifies a bunch of things we've done already
1756                          */
1757                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1758                         keyidx = keyid >> 6;
1759                 }
1760
1761                 /* check per-station GTK first, if multicast packet */
1762                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1763                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1764
1765                 /* if not found, try default key */
1766                 if (!rx->key) {
1767                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1768
1769                         /*
1770                          * RSNA-protected unicast frames should always be
1771                          * sent with pairwise or station-to-station keys,
1772                          * but for WEP we allow using a key index as well.
1773                          */
1774                         if (rx->key &&
1775                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1776                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1777                             !is_multicast_ether_addr(hdr->addr1))
1778                                 rx->key = NULL;
1779                 }
1780         }
1781
1782         if (rx->key) {
1783                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1784                         return RX_DROP_MONITOR;
1785
1786                 /* TODO: add threshold stuff again */
1787         } else {
1788                 return RX_DROP_MONITOR;
1789         }
1790
1791         switch (rx->key->conf.cipher) {
1792         case WLAN_CIPHER_SUITE_WEP40:
1793         case WLAN_CIPHER_SUITE_WEP104:
1794                 result = ieee80211_crypto_wep_decrypt(rx);
1795                 break;
1796         case WLAN_CIPHER_SUITE_TKIP:
1797                 result = ieee80211_crypto_tkip_decrypt(rx);
1798                 break;
1799         case WLAN_CIPHER_SUITE_CCMP:
1800                 result = ieee80211_crypto_ccmp_decrypt(
1801                         rx, IEEE80211_CCMP_MIC_LEN);
1802                 break;
1803         case WLAN_CIPHER_SUITE_CCMP_256:
1804                 result = ieee80211_crypto_ccmp_decrypt(
1805                         rx, IEEE80211_CCMP_256_MIC_LEN);
1806                 break;
1807         case WLAN_CIPHER_SUITE_AES_CMAC:
1808                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1809                 break;
1810         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1811                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1812                 break;
1813         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1814         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1815                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1816                 break;
1817         case WLAN_CIPHER_SUITE_GCMP:
1818         case WLAN_CIPHER_SUITE_GCMP_256:
1819                 result = ieee80211_crypto_gcmp_decrypt(rx);
1820                 break;
1821         default:
1822                 result = ieee80211_crypto_hw_decrypt(rx);
1823         }
1824
1825         /* the hdr variable is invalid after the decrypt handlers */
1826
1827         /* either the frame has been decrypted or will be dropped */
1828         status->flag |= RX_FLAG_DECRYPTED;
1829
1830         return result;
1831 }
1832
1833 static inline struct ieee80211_fragment_entry *
1834 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1835                          unsigned int frag, unsigned int seq, int rx_queue,
1836                          struct sk_buff **skb)
1837 {
1838         struct ieee80211_fragment_entry *entry;
1839
1840         entry = &sdata->fragments[sdata->fragment_next++];
1841         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1842                 sdata->fragment_next = 0;
1843
1844         if (!skb_queue_empty(&entry->skb_list))
1845                 __skb_queue_purge(&entry->skb_list);
1846
1847         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1848         *skb = NULL;
1849         entry->first_frag_time = jiffies;
1850         entry->seq = seq;
1851         entry->rx_queue = rx_queue;
1852         entry->last_frag = frag;
1853         entry->check_sequential_pn = false;
1854         entry->extra_len = 0;
1855
1856         return entry;
1857 }
1858
1859 static inline struct ieee80211_fragment_entry *
1860 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1861                           unsigned int frag, unsigned int seq,
1862                           int rx_queue, struct ieee80211_hdr *hdr)
1863 {
1864         struct ieee80211_fragment_entry *entry;
1865         int i, idx;
1866
1867         idx = sdata->fragment_next;
1868         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1869                 struct ieee80211_hdr *f_hdr;
1870
1871                 idx--;
1872                 if (idx < 0)
1873                         idx = IEEE80211_FRAGMENT_MAX - 1;
1874
1875                 entry = &sdata->fragments[idx];
1876                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1877                     entry->rx_queue != rx_queue ||
1878                     entry->last_frag + 1 != frag)
1879                         continue;
1880
1881                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1882
1883                 /*
1884                  * Check ftype and addresses are equal, else check next fragment
1885                  */
1886                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1887                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1888                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1889                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1890                         continue;
1891
1892                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1893                         __skb_queue_purge(&entry->skb_list);
1894                         continue;
1895                 }
1896                 return entry;
1897         }
1898
1899         return NULL;
1900 }
1901
1902 static ieee80211_rx_result debug_noinline
1903 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1904 {
1905         struct ieee80211_hdr *hdr;
1906         u16 sc;
1907         __le16 fc;
1908         unsigned int frag, seq;
1909         struct ieee80211_fragment_entry *entry;
1910         struct sk_buff *skb;
1911         struct ieee80211_rx_status *status;
1912
1913         hdr = (struct ieee80211_hdr *)rx->skb->data;
1914         fc = hdr->frame_control;
1915
1916         if (ieee80211_is_ctl(fc))
1917                 return RX_CONTINUE;
1918
1919         sc = le16_to_cpu(hdr->seq_ctrl);
1920         frag = sc & IEEE80211_SCTL_FRAG;
1921
1922         if (is_multicast_ether_addr(hdr->addr1)) {
1923                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1924                 goto out_no_led;
1925         }
1926
1927         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1928                 goto out;
1929
1930         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1931
1932         if (skb_linearize(rx->skb))
1933                 return RX_DROP_UNUSABLE;
1934
1935         /*
1936          *  skb_linearize() might change the skb->data and
1937          *  previously cached variables (in this case, hdr) need to
1938          *  be refreshed with the new data.
1939          */
1940         hdr = (struct ieee80211_hdr *)rx->skb->data;
1941         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1942
1943         if (frag == 0) {
1944                 /* This is the first fragment of a new frame. */
1945                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1946                                                  rx->seqno_idx, &(rx->skb));
1947                 if (rx->key &&
1948                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1949                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1950                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1951                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1952                     ieee80211_has_protected(fc)) {
1953                         int queue = rx->security_idx;
1954
1955                         /* Store CCMP/GCMP PN so that we can verify that the
1956                          * next fragment has a sequential PN value.
1957                          */
1958                         entry->check_sequential_pn = true;
1959                         memcpy(entry->last_pn,
1960                                rx->key->u.ccmp.rx_pn[queue],
1961                                IEEE80211_CCMP_PN_LEN);
1962                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1963                                               u.ccmp.rx_pn) !=
1964                                      offsetof(struct ieee80211_key,
1965                                               u.gcmp.rx_pn));
1966                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1967                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1968                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1969                                      IEEE80211_GCMP_PN_LEN);
1970                 }
1971                 return RX_QUEUED;
1972         }
1973
1974         /* This is a fragment for a frame that should already be pending in
1975          * fragment cache. Add this fragment to the end of the pending entry.
1976          */
1977         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1978                                           rx->seqno_idx, hdr);
1979         if (!entry) {
1980                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1981                 return RX_DROP_MONITOR;
1982         }
1983
1984         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1985          *  MPDU PN values are not incrementing in steps of 1."
1986          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1987          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1988          */
1989         if (entry->check_sequential_pn) {
1990                 int i;
1991                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1992                 int queue;
1993
1994                 if (!rx->key ||
1995                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1996                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1997                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1998                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1999                         return RX_DROP_UNUSABLE;
2000                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2001                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2002                         pn[i]++;
2003                         if (pn[i])
2004                                 break;
2005                 }
2006                 queue = rx->security_idx;
2007                 rpn = rx->key->u.ccmp.rx_pn[queue];
2008                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2009                         return RX_DROP_UNUSABLE;
2010                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2011         }
2012
2013         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2014         __skb_queue_tail(&entry->skb_list, rx->skb);
2015         entry->last_frag = frag;
2016         entry->extra_len += rx->skb->len;
2017         if (ieee80211_has_morefrags(fc)) {
2018                 rx->skb = NULL;
2019                 return RX_QUEUED;
2020         }
2021
2022         rx->skb = __skb_dequeue(&entry->skb_list);
2023         if (skb_tailroom(rx->skb) < entry->extra_len) {
2024                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2025                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2026                                               GFP_ATOMIC))) {
2027                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2028                         __skb_queue_purge(&entry->skb_list);
2029                         return RX_DROP_UNUSABLE;
2030                 }
2031         }
2032         while ((skb = __skb_dequeue(&entry->skb_list))) {
2033                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2034                 dev_kfree_skb(skb);
2035         }
2036
2037         /* Complete frame has been reassembled - process it now */
2038         status = IEEE80211_SKB_RXCB(rx->skb);
2039
2040  out:
2041         ieee80211_led_rx(rx->local);
2042  out_no_led:
2043         if (rx->sta)
2044                 rx->sta->rx_stats.packets++;
2045         return RX_CONTINUE;
2046 }
2047
2048 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2049 {
2050         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2051                 return -EACCES;
2052
2053         return 0;
2054 }
2055
2056 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2057 {
2058         struct sk_buff *skb = rx->skb;
2059         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2060
2061         /*
2062          * Pass through unencrypted frames if the hardware has
2063          * decrypted them already.
2064          */
2065         if (status->flag & RX_FLAG_DECRYPTED)
2066                 return 0;
2067
2068         /* Drop unencrypted frames if key is set. */
2069         if (unlikely(!ieee80211_has_protected(fc) &&
2070                      !ieee80211_is_nullfunc(fc) &&
2071                      ieee80211_is_data(fc) && rx->key))
2072                 return -EACCES;
2073
2074         return 0;
2075 }
2076
2077 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2078 {
2079         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2080         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2081         __le16 fc = hdr->frame_control;
2082
2083         /*
2084          * Pass through unencrypted frames if the hardware has
2085          * decrypted them already.
2086          */
2087         if (status->flag & RX_FLAG_DECRYPTED)
2088                 return 0;
2089
2090         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2091                 if (unlikely(!ieee80211_has_protected(fc) &&
2092                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2093                              rx->key)) {
2094                         if (ieee80211_is_deauth(fc) ||
2095                             ieee80211_is_disassoc(fc))
2096                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2097                                                              rx->skb->data,
2098                                                              rx->skb->len);
2099                         return -EACCES;
2100                 }
2101                 /* BIP does not use Protected field, so need to check MMIE */
2102                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2103                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2104                         if (ieee80211_is_deauth(fc) ||
2105                             ieee80211_is_disassoc(fc))
2106                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2107                                                              rx->skb->data,
2108                                                              rx->skb->len);
2109                         return -EACCES;
2110                 }
2111                 /*
2112                  * When using MFP, Action frames are not allowed prior to
2113                  * having configured keys.
2114                  */
2115                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2116                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2117                         return -EACCES;
2118         }
2119
2120         return 0;
2121 }
2122
2123 static int
2124 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2125 {
2126         struct ieee80211_sub_if_data *sdata = rx->sdata;
2127         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2128         bool check_port_control = false;
2129         struct ethhdr *ehdr;
2130         int ret;
2131
2132         *port_control = false;
2133         if (ieee80211_has_a4(hdr->frame_control) &&
2134             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2135                 return -1;
2136
2137         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2138             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2139
2140                 if (!sdata->u.mgd.use_4addr)
2141                         return -1;
2142                 else
2143                         check_port_control = true;
2144         }
2145
2146         if (is_multicast_ether_addr(hdr->addr1) &&
2147             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2148                 return -1;
2149
2150         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2151         if (ret < 0)
2152                 return ret;
2153
2154         ehdr = (struct ethhdr *) rx->skb->data;
2155         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2156                 *port_control = true;
2157         else if (check_port_control)
2158                 return -1;
2159
2160         return 0;
2161 }
2162
2163 /*
2164  * requires that rx->skb is a frame with ethernet header
2165  */
2166 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2167 {
2168         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2169                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2170         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2171
2172         /*
2173          * Allow EAPOL frames to us/the PAE group address regardless
2174          * of whether the frame was encrypted or not.
2175          */
2176         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2177             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2178              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2179                 return true;
2180
2181         if (ieee80211_802_1x_port_control(rx) ||
2182             ieee80211_drop_unencrypted(rx, fc))
2183                 return false;
2184
2185         return true;
2186 }
2187
2188 /*
2189  * requires that rx->skb is a frame with ethernet header
2190  */
2191 static void
2192 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2193 {
2194         struct ieee80211_sub_if_data *sdata = rx->sdata;
2195         struct net_device *dev = sdata->dev;
2196         struct sk_buff *skb, *xmit_skb;
2197         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2198         struct sta_info *dsta;
2199
2200         skb = rx->skb;
2201         xmit_skb = NULL;
2202
2203         ieee80211_rx_stats(dev, skb->len);
2204
2205         if (rx->sta) {
2206                 /* The seqno index has the same property as needed
2207                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2208                  * for non-QoS-data frames. Here we know it's a data
2209                  * frame, so count MSDUs.
2210                  */
2211                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2212                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2213                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2214         }
2215
2216         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2217              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2218             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2219             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2220                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2221                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2222                         /*
2223                          * send multicast frames both to higher layers in
2224                          * local net stack and back to the wireless medium
2225                          */
2226                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2227                         if (!xmit_skb)
2228                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2229                                                     dev->name);
2230                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2231                         dsta = sta_info_get(sdata, skb->data);
2232                         if (dsta) {
2233                                 /*
2234                                  * The destination station is associated to
2235                                  * this AP (in this VLAN), so send the frame
2236                                  * directly to it and do not pass it to local
2237                                  * net stack.
2238                                  */
2239                                 xmit_skb = skb;
2240                                 skb = NULL;
2241                         }
2242                 }
2243         }
2244
2245 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2246         if (skb) {
2247                 /* 'align' will only take the values 0 or 2 here since all
2248                  * frames are required to be aligned to 2-byte boundaries
2249                  * when being passed to mac80211; the code here works just
2250                  * as well if that isn't true, but mac80211 assumes it can
2251                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2252                  */
2253                 int align;
2254
2255                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2256                 if (align) {
2257                         if (WARN_ON(skb_headroom(skb) < 3)) {
2258                                 dev_kfree_skb(skb);
2259                                 skb = NULL;
2260                         } else {
2261                                 u8 *data = skb->data;
2262                                 size_t len = skb_headlen(skb);
2263                                 skb->data -= align;
2264                                 memmove(skb->data, data, len);
2265                                 skb_set_tail_pointer(skb, len);
2266                         }
2267                 }
2268         }
2269 #endif
2270
2271         if (skb) {
2272                 /* deliver to local stack */
2273                 skb->protocol = eth_type_trans(skb, dev);
2274                 memset(skb->cb, 0, sizeof(skb->cb));
2275                 if (rx->napi)
2276                         napi_gro_receive(rx->napi, skb);
2277                 else
2278                         netif_receive_skb(skb);
2279         }
2280
2281         if (xmit_skb) {
2282                 /*
2283                  * Send to wireless media and increase priority by 256 to
2284                  * keep the received priority instead of reclassifying
2285                  * the frame (see cfg80211_classify8021d).
2286                  */
2287                 xmit_skb->priority += 256;
2288                 xmit_skb->protocol = htons(ETH_P_802_3);
2289                 skb_reset_network_header(xmit_skb);
2290                 skb_reset_mac_header(xmit_skb);
2291                 dev_queue_xmit(xmit_skb);
2292         }
2293 }
2294
2295 static ieee80211_rx_result debug_noinline
2296 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2297 {
2298         struct net_device *dev = rx->sdata->dev;
2299         struct sk_buff *skb = rx->skb;
2300         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2301         __le16 fc = hdr->frame_control;
2302         struct sk_buff_head frame_list;
2303         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2304         struct ethhdr ethhdr;
2305         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2306
2307         if (unlikely(!ieee80211_is_data(fc)))
2308                 return RX_CONTINUE;
2309
2310         if (unlikely(!ieee80211_is_data_present(fc)))
2311                 return RX_DROP_MONITOR;
2312
2313         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2314                 return RX_CONTINUE;
2315
2316         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2317                 switch (rx->sdata->vif.type) {
2318                 case NL80211_IFTYPE_AP_VLAN:
2319                         if (!rx->sdata->u.vlan.sta)
2320                                 return RX_DROP_UNUSABLE;
2321                         break;
2322                 case NL80211_IFTYPE_STATION:
2323                         if (!rx->sdata->u.mgd.use_4addr)
2324                                 return RX_DROP_UNUSABLE;
2325                         break;
2326                 default:
2327                         return RX_DROP_UNUSABLE;
2328                 }
2329                 check_da = NULL;
2330                 check_sa = NULL;
2331         } else switch (rx->sdata->vif.type) {
2332                 case NL80211_IFTYPE_AP:
2333                 case NL80211_IFTYPE_AP_VLAN:
2334                         check_da = NULL;
2335                         break;
2336                 case NL80211_IFTYPE_STATION:
2337                         if (!rx->sta ||
2338                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2339                                 check_sa = NULL;
2340                         break;
2341                 case NL80211_IFTYPE_MESH_POINT:
2342                         check_sa = NULL;
2343                         break;
2344                 default:
2345                         break;
2346         }
2347
2348         if (is_multicast_ether_addr(hdr->addr1))
2349                 return RX_DROP_UNUSABLE;
2350
2351         skb->dev = dev;
2352         __skb_queue_head_init(&frame_list);
2353
2354         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2355                                           rx->sdata->vif.addr,
2356                                           rx->sdata->vif.type))
2357                 return RX_DROP_UNUSABLE;
2358
2359         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2360                                  rx->sdata->vif.type,
2361                                  rx->local->hw.extra_tx_headroom,
2362                                  check_da, check_sa);
2363
2364         while (!skb_queue_empty(&frame_list)) {
2365                 rx->skb = __skb_dequeue(&frame_list);
2366
2367                 if (!ieee80211_frame_allowed(rx, fc)) {
2368                         dev_kfree_skb(rx->skb);
2369                         continue;
2370                 }
2371
2372                 ieee80211_deliver_skb(rx);
2373         }
2374
2375         return RX_QUEUED;
2376 }
2377
2378 #ifdef CONFIG_MAC80211_MESH
2379 static ieee80211_rx_result
2380 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2381 {
2382         struct ieee80211_hdr *fwd_hdr, *hdr;
2383         struct ieee80211_tx_info *info;
2384         struct ieee80211s_hdr *mesh_hdr;
2385         struct sk_buff *skb = rx->skb, *fwd_skb;
2386         struct ieee80211_local *local = rx->local;
2387         struct ieee80211_sub_if_data *sdata = rx->sdata;
2388         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2389         u16 ac, q, hdrlen;
2390
2391         hdr = (struct ieee80211_hdr *) skb->data;
2392         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2393
2394         /* make sure fixed part of mesh header is there, also checks skb len */
2395         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2396                 return RX_DROP_MONITOR;
2397
2398         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2399
2400         /* make sure full mesh header is there, also checks skb len */
2401         if (!pskb_may_pull(rx->skb,
2402                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2403                 return RX_DROP_MONITOR;
2404
2405         /* reload pointers */
2406         hdr = (struct ieee80211_hdr *) skb->data;
2407         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2408
2409         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2410                 return RX_DROP_MONITOR;
2411
2412         /* frame is in RMC, don't forward */
2413         if (ieee80211_is_data(hdr->frame_control) &&
2414             is_multicast_ether_addr(hdr->addr1) &&
2415             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2416                 return RX_DROP_MONITOR;
2417
2418         if (!ieee80211_is_data(hdr->frame_control))
2419                 return RX_CONTINUE;
2420
2421         if (!mesh_hdr->ttl)
2422                 return RX_DROP_MONITOR;
2423
2424         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2425                 struct mesh_path *mppath;
2426                 char *proxied_addr;
2427                 char *mpp_addr;
2428
2429                 if (is_multicast_ether_addr(hdr->addr1)) {
2430                         mpp_addr = hdr->addr3;
2431                         proxied_addr = mesh_hdr->eaddr1;
2432                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2433                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2434                         mpp_addr = hdr->addr4;
2435                         proxied_addr = mesh_hdr->eaddr2;
2436                 } else {
2437                         return RX_DROP_MONITOR;
2438                 }
2439
2440                 rcu_read_lock();
2441                 mppath = mpp_path_lookup(sdata, proxied_addr);
2442                 if (!mppath) {
2443                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2444                 } else {
2445                         spin_lock_bh(&mppath->state_lock);
2446                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2447                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2448                         mppath->exp_time = jiffies;
2449                         spin_unlock_bh(&mppath->state_lock);
2450                 }
2451                 rcu_read_unlock();
2452         }
2453
2454         /* Frame has reached destination.  Don't forward */
2455         if (!is_multicast_ether_addr(hdr->addr1) &&
2456             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2457                 return RX_CONTINUE;
2458
2459         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2460         q = sdata->vif.hw_queue[ac];
2461         if (ieee80211_queue_stopped(&local->hw, q)) {
2462                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2463                 return RX_DROP_MONITOR;
2464         }
2465         skb_set_queue_mapping(skb, q);
2466
2467         if (!--mesh_hdr->ttl) {
2468                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2469                 goto out;
2470         }
2471
2472         if (!ifmsh->mshcfg.dot11MeshForwarding)
2473                 goto out;
2474
2475         fwd_skb = skb_copy_expand(skb, local->tx_headroom, 0, GFP_ATOMIC);
2476         if (!fwd_skb) {
2477                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2478                                     sdata->name);
2479                 goto out;
2480         }
2481
2482         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2483         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2484         info = IEEE80211_SKB_CB(fwd_skb);
2485         memset(info, 0, sizeof(*info));
2486         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2487         info->control.vif = &rx->sdata->vif;
2488         info->control.jiffies = jiffies;
2489         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2490                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2491                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2492                 /* update power mode indication when forwarding */
2493                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2494         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2495                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2496                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2497         } else {
2498                 /* unable to resolve next hop */
2499                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2500                                    fwd_hdr->addr3, 0,
2501                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2502                                    fwd_hdr->addr2);
2503                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2504                 kfree_skb(fwd_skb);
2505                 return RX_DROP_MONITOR;
2506         }
2507
2508         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2509         ieee80211_add_pending_skb(local, fwd_skb);
2510  out:
2511         if (is_multicast_ether_addr(hdr->addr1))
2512                 return RX_CONTINUE;
2513         return RX_DROP_MONITOR;
2514 }
2515 #endif
2516
2517 static ieee80211_rx_result debug_noinline
2518 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2519 {
2520         struct ieee80211_sub_if_data *sdata = rx->sdata;
2521         struct ieee80211_local *local = rx->local;
2522         struct net_device *dev = sdata->dev;
2523         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2524         __le16 fc = hdr->frame_control;
2525         bool port_control;
2526         int err;
2527
2528         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2529                 return RX_CONTINUE;
2530
2531         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2532                 return RX_DROP_MONITOR;
2533
2534         /*
2535          * Send unexpected-4addr-frame event to hostapd. For older versions,
2536          * also drop the frame to cooked monitor interfaces.
2537          */
2538         if (ieee80211_has_a4(hdr->frame_control) &&
2539             sdata->vif.type == NL80211_IFTYPE_AP) {
2540                 if (rx->sta &&
2541                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2542                         cfg80211_rx_unexpected_4addr_frame(
2543                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2544                 return RX_DROP_MONITOR;
2545         }
2546
2547         err = __ieee80211_data_to_8023(rx, &port_control);
2548         if (unlikely(err))
2549                 return RX_DROP_UNUSABLE;
2550
2551         if (!ieee80211_frame_allowed(rx, fc))
2552                 return RX_DROP_MONITOR;
2553
2554         /* directly handle TDLS channel switch requests/responses */
2555         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2556                                                 cpu_to_be16(ETH_P_TDLS))) {
2557                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2558
2559                 if (pskb_may_pull(rx->skb,
2560                                   offsetof(struct ieee80211_tdls_data, u)) &&
2561                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2562                     tf->category == WLAN_CATEGORY_TDLS &&
2563                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2564                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2565                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2566                         schedule_work(&local->tdls_chsw_work);
2567                         if (rx->sta)
2568                                 rx->sta->rx_stats.packets++;
2569
2570                         return RX_QUEUED;
2571                 }
2572         }
2573
2574         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2575             unlikely(port_control) && sdata->bss) {
2576                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2577                                      u.ap);
2578                 dev = sdata->dev;
2579                 rx->sdata = sdata;
2580         }
2581
2582         rx->skb->dev = dev;
2583
2584         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2585             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2586             !is_multicast_ether_addr(
2587                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2588             (!local->scanning &&
2589              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2590                 mod_timer(&local->dynamic_ps_timer, jiffies +
2591                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2592
2593         ieee80211_deliver_skb(rx);
2594
2595         return RX_QUEUED;
2596 }
2597
2598 static ieee80211_rx_result debug_noinline
2599 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2600 {
2601         struct sk_buff *skb = rx->skb;
2602         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2603         struct tid_ampdu_rx *tid_agg_rx;
2604         u16 start_seq_num;
2605         u16 tid;
2606
2607         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2608                 return RX_CONTINUE;
2609
2610         if (ieee80211_is_back_req(bar->frame_control)) {
2611                 struct {
2612                         __le16 control, start_seq_num;
2613                 } __packed bar_data;
2614                 struct ieee80211_event event = {
2615                         .type = BAR_RX_EVENT,
2616                 };
2617
2618                 if (!rx->sta)
2619                         return RX_DROP_MONITOR;
2620
2621                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2622                                   &bar_data, sizeof(bar_data)))
2623                         return RX_DROP_MONITOR;
2624
2625                 tid = le16_to_cpu(bar_data.control) >> 12;
2626
2627                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2628                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2629                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2630                                              WLAN_BACK_RECIPIENT,
2631                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2632
2633                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2634                 if (!tid_agg_rx)
2635                         return RX_DROP_MONITOR;
2636
2637                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2638                 event.u.ba.tid = tid;
2639                 event.u.ba.ssn = start_seq_num;
2640                 event.u.ba.sta = &rx->sta->sta;
2641
2642                 /* reset session timer */
2643                 if (tid_agg_rx->timeout)
2644                         mod_timer(&tid_agg_rx->session_timer,
2645                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2646
2647                 spin_lock(&tid_agg_rx->reorder_lock);
2648                 /* release stored frames up to start of BAR */
2649                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2650                                                  start_seq_num, frames);
2651                 spin_unlock(&tid_agg_rx->reorder_lock);
2652
2653                 drv_event_callback(rx->local, rx->sdata, &event);
2654
2655                 kfree_skb(skb);
2656                 return RX_QUEUED;
2657         }
2658
2659         /*
2660          * After this point, we only want management frames,
2661          * so we can drop all remaining control frames to
2662          * cooked monitor interfaces.
2663          */
2664         return RX_DROP_MONITOR;
2665 }
2666
2667 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2668                                            struct ieee80211_mgmt *mgmt,
2669                                            size_t len)
2670 {
2671         struct ieee80211_local *local = sdata->local;
2672         struct sk_buff *skb;
2673         struct ieee80211_mgmt *resp;
2674
2675         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2676                 /* Not to own unicast address */
2677                 return;
2678         }
2679
2680         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2681             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2682                 /* Not from the current AP or not associated yet. */
2683                 return;
2684         }
2685
2686         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2687                 /* Too short SA Query request frame */
2688                 return;
2689         }
2690
2691         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2692         if (skb == NULL)
2693                 return;
2694
2695         skb_reserve(skb, local->hw.extra_tx_headroom);
2696         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2697         memset(resp, 0, 24);
2698         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2699         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2700         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2701         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2702                                           IEEE80211_STYPE_ACTION);
2703         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2704         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2705         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2706         memcpy(resp->u.action.u.sa_query.trans_id,
2707                mgmt->u.action.u.sa_query.trans_id,
2708                WLAN_SA_QUERY_TR_ID_LEN);
2709
2710         ieee80211_tx_skb(sdata, skb);
2711 }
2712
2713 static ieee80211_rx_result debug_noinline
2714 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2715 {
2716         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2717         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2718
2719         /*
2720          * From here on, look only at management frames.
2721          * Data and control frames are already handled,
2722          * and unknown (reserved) frames are useless.
2723          */
2724         if (rx->skb->len < 24)
2725                 return RX_DROP_MONITOR;
2726
2727         if (!ieee80211_is_mgmt(mgmt->frame_control))
2728                 return RX_DROP_MONITOR;
2729
2730         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2731             ieee80211_is_beacon(mgmt->frame_control) &&
2732             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2733                 int sig = 0;
2734
2735                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2736                         sig = status->signal;
2737
2738                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2739                                             rx->skb->data, rx->skb->len,
2740                                             status->freq, sig);
2741                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2742         }
2743
2744         if (ieee80211_drop_unencrypted_mgmt(rx))
2745                 return RX_DROP_UNUSABLE;
2746
2747         return RX_CONTINUE;
2748 }
2749
2750 static ieee80211_rx_result debug_noinline
2751 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2752 {
2753         struct ieee80211_local *local = rx->local;
2754         struct ieee80211_sub_if_data *sdata = rx->sdata;
2755         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2756         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2757         int len = rx->skb->len;
2758
2759         if (!ieee80211_is_action(mgmt->frame_control))
2760                 return RX_CONTINUE;
2761
2762         /* drop too small frames */
2763         if (len < IEEE80211_MIN_ACTION_SIZE)
2764                 return RX_DROP_UNUSABLE;
2765
2766         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2767             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2768             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2769                 return RX_DROP_UNUSABLE;
2770
2771         switch (mgmt->u.action.category) {
2772         case WLAN_CATEGORY_HT:
2773                 /* reject HT action frames from stations not supporting HT */
2774                 if (!rx->sta->sta.ht_cap.ht_supported)
2775                         goto invalid;
2776
2777                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2778                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2779                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2780                     sdata->vif.type != NL80211_IFTYPE_AP &&
2781                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2782                         break;
2783
2784                 /* verify action & smps_control/chanwidth are present */
2785                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2786                         goto invalid;
2787
2788                 switch (mgmt->u.action.u.ht_smps.action) {
2789                 case WLAN_HT_ACTION_SMPS: {
2790                         struct ieee80211_supported_band *sband;
2791                         enum ieee80211_smps_mode smps_mode;
2792
2793                         /* convert to HT capability */
2794                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2795                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2796                                 smps_mode = IEEE80211_SMPS_OFF;
2797                                 break;
2798                         case WLAN_HT_SMPS_CONTROL_STATIC:
2799                                 smps_mode = IEEE80211_SMPS_STATIC;
2800                                 break;
2801                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2802                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2803                                 break;
2804                         default:
2805                                 goto invalid;
2806                         }
2807
2808                         /* if no change do nothing */
2809                         if (rx->sta->sta.smps_mode == smps_mode)
2810                                 goto handled;
2811                         rx->sta->sta.smps_mode = smps_mode;
2812
2813                         sband = rx->local->hw.wiphy->bands[status->band];
2814
2815                         rate_control_rate_update(local, sband, rx->sta,
2816                                                  IEEE80211_RC_SMPS_CHANGED);
2817                         goto handled;
2818                 }
2819                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2820                         struct ieee80211_supported_band *sband;
2821                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2822                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2823
2824                         /* If it doesn't support 40 MHz it can't change ... */
2825                         if (!(rx->sta->sta.ht_cap.cap &
2826                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2827                                 goto handled;
2828
2829                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2830                                 max_bw = IEEE80211_STA_RX_BW_20;
2831                         else
2832                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2833
2834                         /* set cur_max_bandwidth and recalc sta bw */
2835                         rx->sta->cur_max_bandwidth = max_bw;
2836                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2837
2838                         if (rx->sta->sta.bandwidth == new_bw)
2839                                 goto handled;
2840
2841                         rx->sta->sta.bandwidth = new_bw;
2842                         sband = rx->local->hw.wiphy->bands[status->band];
2843
2844                         rate_control_rate_update(local, sband, rx->sta,
2845                                                  IEEE80211_RC_BW_CHANGED);
2846                         goto handled;
2847                 }
2848                 default:
2849                         goto invalid;
2850                 }
2851
2852                 break;
2853         case WLAN_CATEGORY_PUBLIC:
2854                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2855                         goto invalid;
2856                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2857                         break;
2858                 if (!rx->sta)
2859                         break;
2860                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2861                         break;
2862                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2863                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2864                         break;
2865                 if (len < offsetof(struct ieee80211_mgmt,
2866                                    u.action.u.ext_chan_switch.variable))
2867                         goto invalid;
2868                 goto queue;
2869         case WLAN_CATEGORY_VHT:
2870                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2871                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2872                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2873                     sdata->vif.type != NL80211_IFTYPE_AP &&
2874                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2875                         break;
2876
2877                 /* verify action code is present */
2878                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2879                         goto invalid;
2880
2881                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2882                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2883                         u8 opmode;
2884
2885                         /* verify opmode is present */
2886                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2887                                 goto invalid;
2888
2889                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2890
2891                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2892                                                     opmode, status->band);
2893                         goto handled;
2894                 }
2895                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2896                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2897                                 goto invalid;
2898                         goto queue;
2899                 }
2900                 default:
2901                         break;
2902                 }
2903                 break;
2904         case WLAN_CATEGORY_BACK:
2905                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2906                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2907                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2908                     sdata->vif.type != NL80211_IFTYPE_AP &&
2909                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2910                         break;
2911
2912                 /* verify action_code is present */
2913                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2914                         break;
2915
2916                 switch (mgmt->u.action.u.addba_req.action_code) {
2917                 case WLAN_ACTION_ADDBA_REQ:
2918                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2919                                    sizeof(mgmt->u.action.u.addba_req)))
2920                                 goto invalid;
2921                         break;
2922                 case WLAN_ACTION_ADDBA_RESP:
2923                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2924                                    sizeof(mgmt->u.action.u.addba_resp)))
2925                                 goto invalid;
2926                         break;
2927                 case WLAN_ACTION_DELBA:
2928                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2929                                    sizeof(mgmt->u.action.u.delba)))
2930                                 goto invalid;
2931                         break;
2932                 default:
2933                         goto invalid;
2934                 }
2935
2936                 goto queue;
2937         case WLAN_CATEGORY_SPECTRUM_MGMT:
2938                 /* verify action_code is present */
2939                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2940                         break;
2941
2942                 switch (mgmt->u.action.u.measurement.action_code) {
2943                 case WLAN_ACTION_SPCT_MSR_REQ:
2944                         if (status->band != NL80211_BAND_5GHZ)
2945                                 break;
2946
2947                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2948                                    sizeof(mgmt->u.action.u.measurement)))
2949                                 break;
2950
2951                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2952                                 break;
2953
2954                         ieee80211_process_measurement_req(sdata, mgmt, len);
2955                         goto handled;
2956                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2957                         u8 *bssid;
2958                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2959                                    sizeof(mgmt->u.action.u.chan_switch)))
2960                                 break;
2961
2962                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2963                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2964                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2965                                 break;
2966
2967                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2968                                 bssid = sdata->u.mgd.bssid;
2969                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2970                                 bssid = sdata->u.ibss.bssid;
2971                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2972                                 bssid = mgmt->sa;
2973                         else
2974                                 break;
2975
2976                         if (!ether_addr_equal(mgmt->bssid, bssid))
2977                                 break;
2978
2979                         goto queue;
2980                         }
2981                 }
2982                 break;
2983         case WLAN_CATEGORY_SA_QUERY:
2984                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2985                            sizeof(mgmt->u.action.u.sa_query)))
2986                         break;
2987
2988                 switch (mgmt->u.action.u.sa_query.action) {
2989                 case WLAN_ACTION_SA_QUERY_REQUEST:
2990                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2991                                 break;
2992                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2993                         goto handled;
2994                 }
2995                 break;
2996         case WLAN_CATEGORY_SELF_PROTECTED:
2997                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2998                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2999                         break;
3000
3001                 switch (mgmt->u.action.u.self_prot.action_code) {
3002                 case WLAN_SP_MESH_PEERING_OPEN:
3003                 case WLAN_SP_MESH_PEERING_CLOSE:
3004                 case WLAN_SP_MESH_PEERING_CONFIRM:
3005                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3006                                 goto invalid;
3007                         if (sdata->u.mesh.user_mpm)
3008                                 /* userspace handles this frame */
3009                                 break;
3010                         goto queue;
3011                 case WLAN_SP_MGK_INFORM:
3012                 case WLAN_SP_MGK_ACK:
3013                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3014                                 goto invalid;
3015                         break;
3016                 }
3017                 break;
3018         case WLAN_CATEGORY_MESH_ACTION:
3019                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3020                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3021                         break;
3022
3023                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3024                         break;
3025                 if (mesh_action_is_path_sel(mgmt) &&
3026                     !mesh_path_sel_is_hwmp(sdata))
3027                         break;
3028                 goto queue;
3029         }
3030
3031         return RX_CONTINUE;
3032
3033  invalid:
3034         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3035         /* will return in the next handlers */
3036         return RX_CONTINUE;
3037
3038  handled:
3039         if (rx->sta)
3040                 rx->sta->rx_stats.packets++;
3041         dev_kfree_skb(rx->skb);
3042         return RX_QUEUED;
3043
3044  queue:
3045         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3046         skb_queue_tail(&sdata->skb_queue, rx->skb);
3047         ieee80211_queue_work(&local->hw, &sdata->work);
3048         if (rx->sta)
3049                 rx->sta->rx_stats.packets++;
3050         return RX_QUEUED;
3051 }
3052
3053 static ieee80211_rx_result debug_noinline
3054 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3055 {
3056         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3057         int sig = 0;
3058
3059         /* skip known-bad action frames and return them in the next handler */
3060         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3061                 return RX_CONTINUE;
3062
3063         /*
3064          * Getting here means the kernel doesn't know how to handle
3065          * it, but maybe userspace does ... include returned frames
3066          * so userspace can register for those to know whether ones
3067          * it transmitted were processed or returned.
3068          */
3069
3070         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3071                 sig = status->signal;
3072
3073         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3074                              rx->skb->data, rx->skb->len, 0)) {
3075                 if (rx->sta)
3076                         rx->sta->rx_stats.packets++;
3077                 dev_kfree_skb(rx->skb);
3078                 return RX_QUEUED;
3079         }
3080
3081         return RX_CONTINUE;
3082 }
3083
3084 static ieee80211_rx_result debug_noinline
3085 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3086 {
3087         struct ieee80211_local *local = rx->local;
3088         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3089         struct sk_buff *nskb;
3090         struct ieee80211_sub_if_data *sdata = rx->sdata;
3091         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3092
3093         if (!ieee80211_is_action(mgmt->frame_control))
3094                 return RX_CONTINUE;
3095
3096         /*
3097          * For AP mode, hostapd is responsible for handling any action
3098          * frames that we didn't handle, including returning unknown
3099          * ones. For all other modes we will return them to the sender,
3100          * setting the 0x80 bit in the action category, as required by
3101          * 802.11-2012 9.24.4.
3102          * Newer versions of hostapd shall also use the management frame
3103          * registration mechanisms, but older ones still use cooked
3104          * monitor interfaces so push all frames there.
3105          */
3106         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3107             (sdata->vif.type == NL80211_IFTYPE_AP ||
3108              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3109                 return RX_DROP_MONITOR;
3110
3111         if (is_multicast_ether_addr(mgmt->da))
3112                 return RX_DROP_MONITOR;
3113
3114         /* do not return rejected action frames */
3115         if (mgmt->u.action.category & 0x80)
3116                 return RX_DROP_UNUSABLE;
3117
3118         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3119                                GFP_ATOMIC);
3120         if (nskb) {
3121                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3122
3123                 nmgmt->u.action.category |= 0x80;
3124                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3125                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3126
3127                 memset(nskb->cb, 0, sizeof(nskb->cb));
3128
3129                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3130                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3131
3132                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3133                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3134                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3135                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3136                                 info->hw_queue =
3137                                         local->hw.offchannel_tx_hw_queue;
3138                 }
3139
3140                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3141                                             status->band);
3142         }
3143         dev_kfree_skb(rx->skb);
3144         return RX_QUEUED;
3145 }
3146
3147 static ieee80211_rx_result debug_noinline
3148 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3149 {
3150         struct ieee80211_sub_if_data *sdata = rx->sdata;
3151         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3152         __le16 stype;
3153
3154         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3155
3156         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3157             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3158             sdata->vif.type != NL80211_IFTYPE_OCB &&
3159             sdata->vif.type != NL80211_IFTYPE_STATION)
3160                 return RX_DROP_MONITOR;
3161
3162         switch (stype) {
3163         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3164         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3165         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3166                 /* process for all: mesh, mlme, ibss */
3167                 break;
3168         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3169         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3170         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3171         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3172                 if (is_multicast_ether_addr(mgmt->da) &&
3173                     !is_broadcast_ether_addr(mgmt->da))
3174                         return RX_DROP_MONITOR;
3175
3176                 /* process only for station */
3177                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3178                         return RX_DROP_MONITOR;
3179                 break;
3180         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3181                 /* process only for ibss and mesh */
3182                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3183                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3184                         return RX_DROP_MONITOR;
3185                 break;
3186         default:
3187                 return RX_DROP_MONITOR;
3188         }
3189
3190         /* queue up frame and kick off work to process it */
3191         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3192         skb_queue_tail(&sdata->skb_queue, rx->skb);
3193         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3194         if (rx->sta)
3195                 rx->sta->rx_stats.packets++;
3196
3197         return RX_QUEUED;
3198 }
3199
3200 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3201                                         struct ieee80211_rate *rate)
3202 {
3203         struct ieee80211_sub_if_data *sdata;
3204         struct ieee80211_local *local = rx->local;
3205         struct sk_buff *skb = rx->skb, *skb2;
3206         struct net_device *prev_dev = NULL;
3207         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3208         int needed_headroom;
3209
3210         /*
3211          * If cooked monitor has been processed already, then
3212          * don't do it again. If not, set the flag.
3213          */
3214         if (rx->flags & IEEE80211_RX_CMNTR)
3215                 goto out_free_skb;
3216         rx->flags |= IEEE80211_RX_CMNTR;
3217
3218         /* If there are no cooked monitor interfaces, just free the SKB */
3219         if (!local->cooked_mntrs)
3220                 goto out_free_skb;
3221
3222         /* vendor data is long removed here */
3223         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3224         /* room for the radiotap header based on driver features */
3225         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3226
3227         if (skb_headroom(skb) < needed_headroom &&
3228             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3229                 goto out_free_skb;
3230
3231         /* prepend radiotap information */
3232         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3233                                          false);
3234
3235         skb_reset_mac_header(skb);
3236         skb->ip_summed = CHECKSUM_UNNECESSARY;
3237         skb->pkt_type = PACKET_OTHERHOST;
3238         skb->protocol = htons(ETH_P_802_2);
3239
3240         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3241                 if (!ieee80211_sdata_running(sdata))
3242                         continue;
3243
3244                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3245                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3246                         continue;
3247
3248                 if (prev_dev) {
3249                         skb2 = skb_clone(skb, GFP_ATOMIC);
3250                         if (skb2) {
3251                                 skb2->dev = prev_dev;
3252                                 netif_receive_skb(skb2);
3253                         }
3254                 }
3255
3256                 prev_dev = sdata->dev;
3257                 ieee80211_rx_stats(sdata->dev, skb->len);
3258         }
3259
3260         if (prev_dev) {
3261                 skb->dev = prev_dev;
3262                 netif_receive_skb(skb);
3263                 return;
3264         }
3265
3266  out_free_skb:
3267         dev_kfree_skb(skb);
3268 }
3269
3270 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3271                                          ieee80211_rx_result res)
3272 {
3273         switch (res) {
3274         case RX_DROP_MONITOR:
3275                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3276                 if (rx->sta)
3277                         rx->sta->rx_stats.dropped++;
3278                 /* fall through */
3279         case RX_CONTINUE: {
3280                 struct ieee80211_rate *rate = NULL;
3281                 struct ieee80211_supported_band *sband;
3282                 struct ieee80211_rx_status *status;
3283
3284                 status = IEEE80211_SKB_RXCB((rx->skb));
3285
3286                 sband = rx->local->hw.wiphy->bands[status->band];
3287                 if (!(status->flag & RX_FLAG_HT) &&
3288                     !(status->flag & RX_FLAG_VHT))
3289                         rate = &sband->bitrates[status->rate_idx];
3290
3291                 ieee80211_rx_cooked_monitor(rx, rate);
3292                 break;
3293                 }
3294         case RX_DROP_UNUSABLE:
3295                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3296                 if (rx->sta)
3297                         rx->sta->rx_stats.dropped++;
3298                 dev_kfree_skb(rx->skb);
3299                 break;
3300         case RX_QUEUED:
3301                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3302                 break;
3303         }
3304 }
3305
3306 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3307                                   struct sk_buff_head *frames)
3308 {
3309         ieee80211_rx_result res = RX_DROP_MONITOR;
3310         struct sk_buff *skb;
3311
3312 #define CALL_RXH(rxh)                   \
3313         do {                            \
3314                 res = rxh(rx);          \
3315                 if (res != RX_CONTINUE) \
3316                         goto rxh_next;  \
3317         } while (0)
3318
3319         /* Lock here to avoid hitting all of the data used in the RX
3320          * path (e.g. key data, station data, ...) concurrently when
3321          * a frame is released from the reorder buffer due to timeout
3322          * from the timer, potentially concurrently with RX from the
3323          * driver.
3324          */
3325         spin_lock_bh(&rx->local->rx_path_lock);
3326
3327         while ((skb = __skb_dequeue(frames))) {
3328                 /*
3329                  * all the other fields are valid across frames
3330                  * that belong to an aMPDU since they are on the
3331                  * same TID from the same station
3332                  */
3333                 rx->skb = skb;
3334
3335                 CALL_RXH(ieee80211_rx_h_check_more_data);
3336                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3337                 CALL_RXH(ieee80211_rx_h_sta_process);
3338                 CALL_RXH(ieee80211_rx_h_decrypt);
3339                 CALL_RXH(ieee80211_rx_h_defragment);
3340                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3341                 /* must be after MMIC verify so header is counted in MPDU mic */
3342 #ifdef CONFIG_MAC80211_MESH
3343                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3344                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3345 #endif
3346                 CALL_RXH(ieee80211_rx_h_amsdu);
3347                 CALL_RXH(ieee80211_rx_h_data);
3348
3349                 /* special treatment -- needs the queue */
3350                 res = ieee80211_rx_h_ctrl(rx, frames);
3351                 if (res != RX_CONTINUE)
3352                         goto rxh_next;
3353
3354                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3355                 CALL_RXH(ieee80211_rx_h_action);
3356                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3357                 CALL_RXH(ieee80211_rx_h_action_return);
3358                 CALL_RXH(ieee80211_rx_h_mgmt);
3359
3360  rxh_next:
3361                 ieee80211_rx_handlers_result(rx, res);
3362
3363 #undef CALL_RXH
3364         }
3365
3366         spin_unlock_bh(&rx->local->rx_path_lock);
3367 }
3368
3369 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3370 {
3371         struct sk_buff_head reorder_release;
3372         ieee80211_rx_result res = RX_DROP_MONITOR;
3373
3374         __skb_queue_head_init(&reorder_release);
3375
3376 #define CALL_RXH(rxh)                   \
3377         do {                            \
3378                 res = rxh(rx);          \
3379                 if (res != RX_CONTINUE) \
3380                         goto rxh_next;  \
3381         } while (0)
3382
3383         CALL_RXH(ieee80211_rx_h_check_dup);
3384         CALL_RXH(ieee80211_rx_h_check);
3385
3386         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3387
3388         ieee80211_rx_handlers(rx, &reorder_release);
3389         return;
3390
3391  rxh_next:
3392         ieee80211_rx_handlers_result(rx, res);
3393
3394 #undef CALL_RXH
3395 }
3396
3397 /*
3398  * This function makes calls into the RX path, therefore
3399  * it has to be invoked under RCU read lock.
3400  */
3401 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3402 {
3403         struct sk_buff_head frames;
3404         struct ieee80211_rx_data rx = {
3405                 .sta = sta,
3406                 .sdata = sta->sdata,
3407                 .local = sta->local,
3408                 /* This is OK -- must be QoS data frame */
3409                 .security_idx = tid,
3410                 .seqno_idx = tid,
3411                 .napi = NULL, /* must be NULL to not have races */
3412         };
3413         struct tid_ampdu_rx *tid_agg_rx;
3414
3415         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3416         if (!tid_agg_rx)
3417                 return;
3418
3419         __skb_queue_head_init(&frames);
3420
3421         spin_lock(&tid_agg_rx->reorder_lock);
3422         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3423         spin_unlock(&tid_agg_rx->reorder_lock);
3424
3425         if (!skb_queue_empty(&frames)) {
3426                 struct ieee80211_event event = {
3427                         .type = BA_FRAME_TIMEOUT,
3428                         .u.ba.tid = tid,
3429                         .u.ba.sta = &sta->sta,
3430                 };
3431                 drv_event_callback(rx.local, rx.sdata, &event);
3432         }
3433
3434         ieee80211_rx_handlers(&rx, &frames);
3435 }
3436
3437 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3438                                           u16 ssn, u64 filtered,
3439                                           u16 received_mpdus)
3440 {
3441         struct sta_info *sta;
3442         struct tid_ampdu_rx *tid_agg_rx;
3443         struct sk_buff_head frames;
3444         struct ieee80211_rx_data rx = {
3445                 /* This is OK -- must be QoS data frame */
3446                 .security_idx = tid,
3447                 .seqno_idx = tid,
3448         };
3449         int i, diff;
3450
3451         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3452                 return;
3453
3454         __skb_queue_head_init(&frames);
3455
3456         sta = container_of(pubsta, struct sta_info, sta);
3457
3458         rx.sta = sta;
3459         rx.sdata = sta->sdata;
3460         rx.local = sta->local;
3461
3462         rcu_read_lock();
3463         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3464         if (!tid_agg_rx)
3465                 goto out;
3466
3467         spin_lock_bh(&tid_agg_rx->reorder_lock);
3468
3469         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3470                 int release;
3471
3472                 /* release all frames in the reorder buffer */
3473                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3474                            IEEE80211_SN_MODULO;
3475                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3476                                                  release, &frames);
3477                 /* update ssn to match received ssn */
3478                 tid_agg_rx->head_seq_num = ssn;
3479         } else {
3480                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3481                                                  &frames);
3482         }
3483
3484         /* handle the case that received ssn is behind the mac ssn.
3485          * it can be tid_agg_rx->buf_size behind and still be valid */
3486         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3487         if (diff >= tid_agg_rx->buf_size) {
3488                 tid_agg_rx->reorder_buf_filtered = 0;
3489                 goto release;
3490         }
3491         filtered = filtered >> diff;
3492         ssn += diff;
3493
3494         /* update bitmap */
3495         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3496                 int index = (ssn + i) % tid_agg_rx->buf_size;
3497
3498                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3499                 if (filtered & BIT_ULL(i))
3500                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3501         }
3502
3503         /* now process also frames that the filter marking released */
3504         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3505
3506 release:
3507         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3508
3509         ieee80211_rx_handlers(&rx, &frames);
3510
3511  out:
3512         rcu_read_unlock();
3513 }
3514 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3515
3516 /* main receive path */
3517
3518 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3519 {
3520         struct ieee80211_sub_if_data *sdata = rx->sdata;
3521         struct sk_buff *skb = rx->skb;
3522         struct ieee80211_hdr *hdr = (void *)skb->data;
3523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3524         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3525         int multicast = is_multicast_ether_addr(hdr->addr1);
3526
3527         switch (sdata->vif.type) {
3528         case NL80211_IFTYPE_STATION:
3529                 if (!bssid && !sdata->u.mgd.use_4addr)
3530                         return false;
3531                 if (multicast)
3532                         return true;
3533                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3534         case NL80211_IFTYPE_ADHOC:
3535                 if (!bssid)
3536                         return false;
3537                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3538                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3539                         return false;
3540                 if (ieee80211_is_beacon(hdr->frame_control))
3541                         return true;
3542                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3543                         return false;
3544                 if (!multicast &&
3545                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3546                         return false;
3547                 if (!rx->sta) {
3548                         int rate_idx;
3549                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3550                                 rate_idx = 0; /* TODO: HT/VHT rates */
3551                         else
3552                                 rate_idx = status->rate_idx;
3553                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3554                                                  BIT(rate_idx));
3555                 }
3556                 return true;
3557         case NL80211_IFTYPE_OCB:
3558                 if (!bssid)
3559                         return false;
3560                 if (!ieee80211_is_data_present(hdr->frame_control))
3561                         return false;
3562                 if (!is_broadcast_ether_addr(bssid))
3563                         return false;
3564                 if (!multicast &&
3565                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3566                         return false;
3567                 if (!rx->sta) {
3568                         int rate_idx;
3569                         if (status->flag & RX_FLAG_HT)
3570                                 rate_idx = 0; /* TODO: HT rates */
3571                         else
3572                                 rate_idx = status->rate_idx;
3573                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3574                                                 BIT(rate_idx));
3575                 }
3576                 return true;
3577         case NL80211_IFTYPE_MESH_POINT:
3578                 if (multicast)
3579                         return true;
3580                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3581         case NL80211_IFTYPE_AP_VLAN:
3582         case NL80211_IFTYPE_AP:
3583                 if (!bssid)
3584                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3585
3586                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3587                         /*
3588                          * Accept public action frames even when the
3589                          * BSSID doesn't match, this is used for P2P
3590                          * and location updates. Note that mac80211
3591                          * itself never looks at these frames.
3592                          */
3593                         if (!multicast &&
3594                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3595                                 return false;
3596                         if (ieee80211_is_public_action(hdr, skb->len))
3597                                 return true;
3598                         return ieee80211_is_beacon(hdr->frame_control);
3599                 }
3600
3601                 if (!ieee80211_has_tods(hdr->frame_control)) {
3602                         /* ignore data frames to TDLS-peers */
3603                         if (ieee80211_is_data(hdr->frame_control))
3604                                 return false;
3605                         /* ignore action frames to TDLS-peers */
3606                         if (ieee80211_is_action(hdr->frame_control) &&
3607                             !is_broadcast_ether_addr(bssid) &&
3608                             !ether_addr_equal(bssid, hdr->addr1))
3609                                 return false;
3610                 }
3611                 return true;
3612         case NL80211_IFTYPE_WDS:
3613                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3614                         return false;
3615                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3616         case NL80211_IFTYPE_P2P_DEVICE:
3617                 return ieee80211_is_public_action(hdr, skb->len) ||
3618                        ieee80211_is_probe_req(hdr->frame_control) ||
3619                        ieee80211_is_probe_resp(hdr->frame_control) ||
3620                        ieee80211_is_beacon(hdr->frame_control);
3621         case NL80211_IFTYPE_NAN:
3622                 /* Currently no frames on NAN interface are allowed */
3623                 return false;
3624         default:
3625                 break;
3626         }
3627
3628         WARN_ON_ONCE(1);
3629         return false;
3630 }
3631
3632 void ieee80211_check_fast_rx(struct sta_info *sta)
3633 {
3634         struct ieee80211_sub_if_data *sdata = sta->sdata;
3635         struct ieee80211_local *local = sdata->local;
3636         struct ieee80211_key *key;
3637         struct ieee80211_fast_rx fastrx = {
3638                 .dev = sdata->dev,
3639                 .vif_type = sdata->vif.type,
3640                 .control_port_protocol = sdata->control_port_protocol,
3641         }, *old, *new = NULL;
3642         bool assign = false;
3643
3644         /* use sparse to check that we don't return without updating */
3645         __acquire(check_fast_rx);
3646
3647         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3648         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3649         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3650         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3651
3652         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3653
3654         /* fast-rx doesn't do reordering */
3655         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3656             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3657                 goto clear;
3658
3659         switch (sdata->vif.type) {
3660         case NL80211_IFTYPE_STATION:
3661                 /* 4-addr is harder to deal with, later maybe */
3662                 if (sdata->u.mgd.use_4addr)
3663                         goto clear;
3664                 /* software powersave is a huge mess, avoid all of it */
3665                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3666                         goto clear;
3667                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3668                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3669                         goto clear;
3670                 if (sta->sta.tdls) {
3671                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3672                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3673                         fastrx.expected_ds_bits = 0;
3674                 } else {
3675                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3676                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3677                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3678                         fastrx.expected_ds_bits =
3679                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3680                 }
3681                 break;
3682         case NL80211_IFTYPE_AP_VLAN:
3683         case NL80211_IFTYPE_AP:
3684                 /* parallel-rx requires this, at least with calls to
3685                  * ieee80211_sta_ps_transition()
3686                  */
3687                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3688                         goto clear;
3689                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3690                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3691                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3692
3693                 fastrx.internal_forward =
3694                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3695                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3696                          !sdata->u.vlan.sta);
3697                 break;
3698         default:
3699                 goto clear;
3700         }
3701
3702         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3703                 goto clear;
3704
3705         rcu_read_lock();
3706         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3707         if (key) {
3708                 switch (key->conf.cipher) {
3709                 case WLAN_CIPHER_SUITE_TKIP:
3710                         /* we don't want to deal with MMIC in fast-rx */
3711                         goto clear_rcu;
3712                 case WLAN_CIPHER_SUITE_CCMP:
3713                 case WLAN_CIPHER_SUITE_CCMP_256:
3714                 case WLAN_CIPHER_SUITE_GCMP:
3715                 case WLAN_CIPHER_SUITE_GCMP_256:
3716                         break;
3717                 default:
3718                         /* we also don't want to deal with WEP or cipher scheme
3719                          * since those require looking up the key idx in the
3720                          * frame, rather than assuming the PTK is used
3721                          * (we need to revisit this once we implement the real
3722                          * PTK index, which is now valid in the spec, but we
3723                          * haven't implemented that part yet)
3724                          */
3725                         goto clear_rcu;
3726                 }
3727
3728                 fastrx.key = true;
3729                 fastrx.icv_len = key->conf.icv_len;
3730         }
3731
3732         assign = true;
3733  clear_rcu:
3734         rcu_read_unlock();
3735  clear:
3736         __release(check_fast_rx);
3737
3738         if (assign)
3739                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3740
3741         spin_lock_bh(&sta->lock);
3742         old = rcu_dereference_protected(sta->fast_rx, true);
3743         rcu_assign_pointer(sta->fast_rx, new);
3744         spin_unlock_bh(&sta->lock);
3745
3746         if (old)
3747                 kfree_rcu(old, rcu_head);
3748 }
3749
3750 void ieee80211_clear_fast_rx(struct sta_info *sta)
3751 {
3752         struct ieee80211_fast_rx *old;
3753
3754         spin_lock_bh(&sta->lock);
3755         old = rcu_dereference_protected(sta->fast_rx, true);
3756         RCU_INIT_POINTER(sta->fast_rx, NULL);
3757         spin_unlock_bh(&sta->lock);
3758
3759         if (old)
3760                 kfree_rcu(old, rcu_head);
3761 }
3762
3763 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3764 {
3765         struct ieee80211_local *local = sdata->local;
3766         struct sta_info *sta;
3767
3768         lockdep_assert_held(&local->sta_mtx);
3769
3770         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3771                 if (sdata != sta->sdata &&
3772                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3773                         continue;
3774                 ieee80211_check_fast_rx(sta);
3775         }
3776 }
3777
3778 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3779 {
3780         struct ieee80211_local *local = sdata->local;
3781
3782         mutex_lock(&local->sta_mtx);
3783         __ieee80211_check_fast_rx_iface(sdata);
3784         mutex_unlock(&local->sta_mtx);
3785 }
3786
3787 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3788                                      struct ieee80211_fast_rx *fast_rx)
3789 {
3790         struct sk_buff *skb = rx->skb;
3791         struct ieee80211_hdr *hdr = (void *)skb->data;
3792         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3793         struct sta_info *sta = rx->sta;
3794         int orig_len = skb->len;
3795         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3796         struct {
3797                 u8 snap[sizeof(rfc1042_header)];
3798                 __be16 proto;
3799         } *payload __aligned(2);
3800         struct {
3801                 u8 da[ETH_ALEN];
3802                 u8 sa[ETH_ALEN];
3803         } addrs __aligned(2);
3804         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3805
3806         if (fast_rx->uses_rss)
3807                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3808
3809         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3810          * to a common data structure; drivers can implement that per queue
3811          * but we don't have that information in mac80211
3812          */
3813         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3814                 return false;
3815
3816 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3817
3818         /* If using encryption, we also need to have:
3819          *  - PN_VALIDATED: similar, but the implementation is tricky
3820          *  - DECRYPTED: necessary for PN_VALIDATED
3821          */
3822         if (fast_rx->key &&
3823             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3824                 return false;
3825
3826         /* we don't deal with A-MSDU deaggregation here */
3827         if (status->rx_flags & IEEE80211_RX_AMSDU)
3828                 return false;
3829
3830         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3831                 return false;
3832
3833         if (unlikely(ieee80211_is_frag(hdr)))
3834                 return false;
3835
3836         /* Since our interface address cannot be multicast, this
3837          * implicitly also rejects multicast frames without the
3838          * explicit check.
3839          *
3840          * We shouldn't get any *data* frames not addressed to us
3841          * (AP mode will accept multicast *management* frames), but
3842          * punting here will make it go through the full checks in
3843          * ieee80211_accept_frame().
3844          */
3845         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3846                 return false;
3847
3848         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3849                                               IEEE80211_FCTL_TODS)) !=
3850             fast_rx->expected_ds_bits)
3851                 goto drop;
3852
3853         /* assign the key to drop unencrypted frames (later)
3854          * and strip the IV/MIC if necessary
3855          */
3856         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3857                 /* GCMP header length is the same */
3858                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3859         }
3860
3861         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3862                 goto drop;
3863         payload = (void *)(skb->data + snap_offs);
3864
3865         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3866                 return false;
3867
3868         /* Don't handle these here since they require special code.
3869          * Accept AARP and IPX even though they should come with a
3870          * bridge-tunnel header - but if we get them this way then
3871          * there's little point in discarding them.
3872          */
3873         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3874                      payload->proto == fast_rx->control_port_protocol))
3875                 return false;
3876
3877         /* after this point, don't punt to the slowpath! */
3878
3879         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3880             pskb_trim(skb, skb->len - fast_rx->icv_len))
3881                 goto drop;
3882
3883         if (unlikely(fast_rx->sta_notify)) {
3884                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3885                 fast_rx->sta_notify = false;
3886         }
3887
3888         /* statistics part of ieee80211_rx_h_sta_process() */
3889         stats->last_rx = jiffies;
3890         stats->last_rate = sta_stats_encode_rate(status);
3891
3892         stats->fragments++;
3893
3894         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3895                 stats->last_signal = status->signal;
3896                 if (!fast_rx->uses_rss)
3897                         ewma_signal_add(&sta->rx_stats_avg.signal,
3898                                         -status->signal);
3899         }
3900
3901         if (status->chains) {
3902                 int i;
3903
3904                 stats->chains = status->chains;
3905                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3906                         int signal = status->chain_signal[i];
3907
3908                         if (!(status->chains & BIT(i)))
3909                                 continue;
3910
3911                         stats->chain_signal_last[i] = signal;
3912                         if (!fast_rx->uses_rss)
3913                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3914                                                 -signal);
3915                 }
3916         }
3917         /* end of statistics */
3918
3919         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3920                 goto drop;
3921
3922         /* do the header conversion - first grab the addresses */
3923         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3924         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3925         /* remove the SNAP but leave the ethertype */
3926         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3927         /* push the addresses in front */
3928         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3929
3930         skb->dev = fast_rx->dev;
3931
3932         ieee80211_rx_stats(fast_rx->dev, skb->len);
3933
3934         /* The seqno index has the same property as needed
3935          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3936          * for non-QoS-data frames. Here we know it's a data
3937          * frame, so count MSDUs.
3938          */
3939         u64_stats_update_begin(&stats->syncp);
3940         stats->msdu[rx->seqno_idx]++;
3941         stats->bytes += orig_len;
3942         u64_stats_update_end(&stats->syncp);
3943
3944         if (fast_rx->internal_forward) {
3945                 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3946
3947                 if (dsta) {
3948                         /*
3949                          * Send to wireless media and increase priority by 256
3950                          * to keep the received priority instead of
3951                          * reclassifying the frame (see cfg80211_classify8021d).
3952                          */
3953                         skb->priority += 256;
3954                         skb->protocol = htons(ETH_P_802_3);
3955                         skb_reset_network_header(skb);
3956                         skb_reset_mac_header(skb);
3957                         dev_queue_xmit(skb);
3958                         return true;
3959                 }
3960         }
3961
3962         /* deliver to local stack */
3963         skb->protocol = eth_type_trans(skb, fast_rx->dev);
3964         memset(skb->cb, 0, sizeof(skb->cb));
3965         if (rx->napi)
3966                 napi_gro_receive(rx->napi, skb);
3967         else
3968                 netif_receive_skb(skb);
3969
3970         return true;
3971  drop:
3972         dev_kfree_skb(skb);
3973         stats->dropped++;
3974         return true;
3975 }
3976
3977 /*
3978  * This function returns whether or not the SKB
3979  * was destined for RX processing or not, which,
3980  * if consume is true, is equivalent to whether
3981  * or not the skb was consumed.
3982  */
3983 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3984                                             struct sk_buff *skb, bool consume)
3985 {
3986         struct ieee80211_local *local = rx->local;
3987         struct ieee80211_sub_if_data *sdata = rx->sdata;
3988
3989         rx->skb = skb;
3990
3991         /* See if we can do fast-rx; if we have to copy we already lost,
3992          * so punt in that case. We should never have to deliver a data
3993          * frame to multiple interfaces anyway.
3994          *
3995          * We skip the ieee80211_accept_frame() call and do the necessary
3996          * checking inside ieee80211_invoke_fast_rx().
3997          */
3998         if (consume && rx->sta) {
3999                 struct ieee80211_fast_rx *fast_rx;
4000
4001                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4002                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4003                         return true;
4004         }
4005
4006         if (!ieee80211_accept_frame(rx))
4007                 return false;
4008
4009         if (!consume) {
4010                 skb = skb_copy(skb, GFP_ATOMIC);
4011                 if (!skb) {
4012                         if (net_ratelimit())
4013                                 wiphy_debug(local->hw.wiphy,
4014                                         "failed to copy skb for %s\n",
4015                                         sdata->name);
4016                         return true;
4017                 }
4018
4019                 rx->skb = skb;
4020         }
4021
4022         ieee80211_invoke_rx_handlers(rx);
4023         return true;
4024 }
4025
4026 /*
4027  * This is the actual Rx frames handler. as it belongs to Rx path it must
4028  * be called with rcu_read_lock protection.
4029  */
4030 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4031                                          struct ieee80211_sta *pubsta,
4032                                          struct sk_buff *skb,
4033                                          struct napi_struct *napi)
4034 {
4035         struct ieee80211_local *local = hw_to_local(hw);
4036         struct ieee80211_sub_if_data *sdata;
4037         struct ieee80211_hdr *hdr;
4038         __le16 fc;
4039         struct ieee80211_rx_data rx;
4040         struct ieee80211_sub_if_data *prev;
4041         struct rhlist_head *tmp;
4042         int err = 0;
4043
4044         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4045         memset(&rx, 0, sizeof(rx));
4046         rx.skb = skb;
4047         rx.local = local;
4048         rx.napi = napi;
4049
4050         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4051                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4052
4053         if (ieee80211_is_mgmt(fc)) {
4054                 /* drop frame if too short for header */
4055                 if (skb->len < ieee80211_hdrlen(fc))
4056                         err = -ENOBUFS;
4057                 else
4058                         err = skb_linearize(skb);
4059         } else {
4060                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4061         }
4062
4063         if (err) {
4064                 dev_kfree_skb(skb);
4065                 return;
4066         }
4067
4068         hdr = (struct ieee80211_hdr *)skb->data;
4069         ieee80211_parse_qos(&rx);
4070         ieee80211_verify_alignment(&rx);
4071
4072         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4073                      ieee80211_is_beacon(hdr->frame_control)))
4074                 ieee80211_scan_rx(local, skb);
4075
4076         if (pubsta) {
4077                 rx.sta = container_of(pubsta, struct sta_info, sta);
4078                 rx.sdata = rx.sta->sdata;
4079                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4080                         return;
4081                 goto out;
4082         } else if (ieee80211_is_data(fc)) {
4083                 struct sta_info *sta, *prev_sta;
4084
4085                 prev_sta = NULL;
4086
4087                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4088                         if (!prev_sta) {
4089                                 prev_sta = sta;
4090                                 continue;
4091                         }
4092
4093                         rx.sta = prev_sta;
4094                         rx.sdata = prev_sta->sdata;
4095                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4096
4097                         prev_sta = sta;
4098                 }
4099
4100                 if (prev_sta) {
4101                         rx.sta = prev_sta;
4102                         rx.sdata = prev_sta->sdata;
4103
4104                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4105                                 return;
4106                         goto out;
4107                 }
4108         }
4109
4110         prev = NULL;
4111
4112         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4113                 if (!ieee80211_sdata_running(sdata))
4114                         continue;
4115
4116                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4117                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4118                         continue;
4119
4120                 /*
4121                  * frame is destined for this interface, but if it's
4122                  * not also for the previous one we handle that after
4123                  * the loop to avoid copying the SKB once too much
4124                  */
4125
4126                 if (!prev) {
4127                         prev = sdata;
4128                         continue;
4129                 }
4130
4131                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4132                 rx.sdata = prev;
4133                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4134
4135                 prev = sdata;
4136         }
4137
4138         if (prev) {
4139                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4140                 rx.sdata = prev;
4141
4142                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4143                         return;
4144         }
4145
4146  out:
4147         dev_kfree_skb(skb);
4148 }
4149
4150 /*
4151  * This is the receive path handler. It is called by a low level driver when an
4152  * 802.11 MPDU is received from the hardware.
4153  */
4154 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4155                        struct sk_buff *skb, struct napi_struct *napi)
4156 {
4157         struct ieee80211_local *local = hw_to_local(hw);
4158         struct ieee80211_rate *rate = NULL;
4159         struct ieee80211_supported_band *sband;
4160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4161
4162         WARN_ON_ONCE(softirq_count() == 0);
4163
4164         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4165                 goto drop;
4166
4167         sband = local->hw.wiphy->bands[status->band];
4168         if (WARN_ON(!sband))
4169                 goto drop;
4170
4171         /*
4172          * If we're suspending, it is possible although not too likely
4173          * that we'd be receiving frames after having already partially
4174          * quiesced the stack. We can't process such frames then since
4175          * that might, for example, cause stations to be added or other
4176          * driver callbacks be invoked.
4177          */
4178         if (unlikely(local->quiescing || local->suspended))
4179                 goto drop;
4180
4181         /* We might be during a HW reconfig, prevent Rx for the same reason */
4182         if (unlikely(local->in_reconfig))
4183                 goto drop;
4184
4185         /*
4186          * The same happens when we're not even started,
4187          * but that's worth a warning.
4188          */
4189         if (WARN_ON(!local->started))
4190                 goto drop;
4191
4192         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4193                 /*
4194                  * Validate the rate, unless a PLCP error means that
4195                  * we probably can't have a valid rate here anyway.
4196                  */
4197
4198                 if (status->flag & RX_FLAG_HT) {
4199                         /*
4200                          * rate_idx is MCS index, which can be [0-76]
4201                          * as documented on:
4202                          *
4203                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4204                          *
4205                          * Anything else would be some sort of driver or
4206                          * hardware error. The driver should catch hardware
4207                          * errors.
4208                          */
4209                         if (WARN(status->rate_idx > 76,
4210                                  "Rate marked as an HT rate but passed "
4211                                  "status->rate_idx is not "
4212                                  "an MCS index [0-76]: %d (0x%02x)\n",
4213                                  status->rate_idx,
4214                                  status->rate_idx))
4215                                 goto drop;
4216                 } else if (status->flag & RX_FLAG_VHT) {
4217                         if (WARN_ONCE(status->rate_idx > 9 ||
4218                                       !status->vht_nss ||
4219                                       status->vht_nss > 8,
4220                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4221                                       status->rate_idx, status->vht_nss))
4222                                 goto drop;
4223                 } else {
4224                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4225                                 goto drop;
4226                         rate = &sband->bitrates[status->rate_idx];
4227                 }
4228         }
4229
4230         status->rx_flags = 0;
4231
4232         /*
4233          * key references and virtual interfaces are protected using RCU
4234          * and this requires that we are in a read-side RCU section during
4235          * receive processing
4236          */
4237         rcu_read_lock();
4238
4239         /*
4240          * Frames with failed FCS/PLCP checksum are not returned,
4241          * all other frames are returned without radiotap header
4242          * if it was previously present.
4243          * Also, frames with less than 16 bytes are dropped.
4244          */
4245         skb = ieee80211_rx_monitor(local, skb, rate);
4246         if (!skb) {
4247                 rcu_read_unlock();
4248                 return;
4249         }
4250
4251         ieee80211_tpt_led_trig_rx(local,
4252                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4253                         skb->len);
4254
4255         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4256
4257         rcu_read_unlock();
4258
4259         return;
4260  drop:
4261         kfree_skb(skb);
4262 }
4263 EXPORT_SYMBOL(ieee80211_rx_napi);
4264
4265 /* This is a version of the rx handler that can be called from hard irq
4266  * context. Post the skb on the queue and schedule the tasklet */
4267 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4268 {
4269         struct ieee80211_local *local = hw_to_local(hw);
4270
4271         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4272
4273         skb->pkt_type = IEEE80211_RX_MSG;
4274         skb_queue_tail(&local->skb_queue, skb);
4275         tasklet_schedule(&local->tasklet);
4276 }
4277 EXPORT_SYMBOL(ieee80211_rx_irqsafe);