net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  *
   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         /*
1038          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1039          * be reordered.
1040          */
1041         if (unlikely(!tid_agg_rx->started)) {
1042                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1043                         ret = false;
1044                         goto out;
1045                 }
1046                 tid_agg_rx->started = true;
1047         }
1048
1049         /* frame with out of date sequence number */
1050         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1051                 dev_kfree_skb(skb);
1052                 goto out;
1053         }
1054
1055         /*
1056          * If frame the sequence number exceeds our buffering window
1057          * size release some previous frames to make room for this one.
1058          */
1059         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1060                 head_seq_num = ieee80211_sn_inc(
1061                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1062                 /* release stored frames up to new head to stack */
1063                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1064                                                  head_seq_num, frames);
1065         }
1066
1067         /* Now the new frame is always in the range of the reordering buffer */
1068
1069         index = mpdu_seq_num % tid_agg_rx->buf_size;
1070
1071         /* check if we already stored this frame */
1072         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1073                 dev_kfree_skb(skb);
1074                 goto out;
1075         }
1076
1077         /*
1078          * If the current MPDU is in the right order and nothing else
1079          * is stored we can process it directly, no need to buffer it.
1080          * If it is first but there's something stored, we may be able
1081          * to release frames after this one.
1082          */
1083         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1084             tid_agg_rx->stored_mpdu_num == 0) {
1085                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1086                         tid_agg_rx->head_seq_num =
1087                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1088                 ret = false;
1089                 goto out;
1090         }
1091
1092         /* put the frame in the reordering buffer */
1093         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1094         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1095                 tid_agg_rx->reorder_time[index] = jiffies;
1096                 tid_agg_rx->stored_mpdu_num++;
1097                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1098         }
1099
1100  out:
1101         spin_unlock(&tid_agg_rx->reorder_lock);
1102         return ret;
1103 }
1104
1105 /*
1106  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1107  * true if the MPDU was buffered, false if it should be processed.
1108  */
1109 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1110                                        struct sk_buff_head *frames)
1111 {
1112         struct sk_buff *skb = rx->skb;
1113         struct ieee80211_local *local = rx->local;
1114         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1115         struct sta_info *sta = rx->sta;
1116         struct tid_ampdu_rx *tid_agg_rx;
1117         u16 sc;
1118         u8 tid, ack_policy;
1119
1120         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1121             is_multicast_ether_addr(hdr->addr1))
1122                 goto dont_reorder;
1123
1124         /*
1125          * filter the QoS data rx stream according to
1126          * STA/TID and check if this STA/TID is on aggregation
1127          */
1128
1129         if (!sta)
1130                 goto dont_reorder;
1131
1132         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1133                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1134         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1135
1136         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1137         if (!tid_agg_rx) {
1138                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1139                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1140                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1141                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1142                                              WLAN_BACK_RECIPIENT,
1143                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1144                 goto dont_reorder;
1145         }
1146
1147         /* qos null data frames are excluded */
1148         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1149                 goto dont_reorder;
1150
1151         /* not part of a BA session */
1152         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1153             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1154                 goto dont_reorder;
1155
1156         /* new, potentially un-ordered, ampdu frame - process it */
1157
1158         /* reset session timer */
1159         if (tid_agg_rx->timeout)
1160                 tid_agg_rx->last_rx = jiffies;
1161
1162         /* if this mpdu is fragmented - terminate rx aggregation session */
1163         sc = le16_to_cpu(hdr->seq_ctrl);
1164         if (sc & IEEE80211_SCTL_FRAG) {
1165                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1166                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1167                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1168                 return;
1169         }
1170
1171         /*
1172          * No locking needed -- we will only ever process one
1173          * RX packet at a time, and thus own tid_agg_rx. All
1174          * other code manipulating it needs to (and does) make
1175          * sure that we cannot get to it any more before doing
1176          * anything with it.
1177          */
1178         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1179                                              frames))
1180                 return;
1181
1182  dont_reorder:
1183         __skb_queue_tail(frames, skb);
1184 }
1185
1186 static ieee80211_rx_result debug_noinline
1187 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1188 {
1189         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1190         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1191
1192         if (status->flag & RX_FLAG_DUP_VALIDATED)
1193                 return RX_CONTINUE;
1194
1195         /*
1196          * Drop duplicate 802.11 retransmissions
1197          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1198          */
1199
1200         if (rx->skb->len < 24)
1201                 return RX_CONTINUE;
1202
1203         if (ieee80211_is_ctl(hdr->frame_control) ||
1204             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1205             is_multicast_ether_addr(hdr->addr1))
1206                 return RX_CONTINUE;
1207
1208         if (!rx->sta)
1209                 return RX_CONTINUE;
1210
1211         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1212                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1213                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1214                 rx->sta->rx_stats.num_duplicates++;
1215                 return RX_DROP_UNUSABLE;
1216         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1217                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1218         }
1219
1220         return RX_CONTINUE;
1221 }
1222
1223 static ieee80211_rx_result debug_noinline
1224 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1225 {
1226         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1227
1228         /* Drop disallowed frame classes based on STA auth/assoc state;
1229          * IEEE 802.11, Chap 5.5.
1230          *
1231          * mac80211 filters only based on association state, i.e. it drops
1232          * Class 3 frames from not associated stations. hostapd sends
1233          * deauth/disassoc frames when needed. In addition, hostapd is
1234          * responsible for filtering on both auth and assoc states.
1235          */
1236
1237         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1238                 return ieee80211_rx_mesh_check(rx);
1239
1240         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1241                       ieee80211_is_pspoll(hdr->frame_control)) &&
1242                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1243                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1244                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1245                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1246                 /*
1247                  * accept port control frames from the AP even when it's not
1248                  * yet marked ASSOC to prevent a race where we don't set the
1249                  * assoc bit quickly enough before it sends the first frame
1250                  */
1251                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1252                     ieee80211_is_data_present(hdr->frame_control)) {
1253                         unsigned int hdrlen;
1254                         __be16 ethertype;
1255
1256                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1257
1258                         if (rx->skb->len < hdrlen + 8)
1259                                 return RX_DROP_MONITOR;
1260
1261                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1262                         if (ethertype == rx->sdata->control_port_protocol)
1263                                 return RX_CONTINUE;
1264                 }
1265
1266                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1267                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1268                                                hdr->addr2,
1269                                                GFP_ATOMIC))
1270                         return RX_DROP_UNUSABLE;
1271
1272                 return RX_DROP_MONITOR;
1273         }
1274
1275         return RX_CONTINUE;
1276 }
1277
1278
1279 static ieee80211_rx_result debug_noinline
1280 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1281 {
1282         struct ieee80211_local *local;
1283         struct ieee80211_hdr *hdr;
1284         struct sk_buff *skb;
1285
1286         local = rx->local;
1287         skb = rx->skb;
1288         hdr = (struct ieee80211_hdr *) skb->data;
1289
1290         if (!local->pspolling)
1291                 return RX_CONTINUE;
1292
1293         if (!ieee80211_has_fromds(hdr->frame_control))
1294                 /* this is not from AP */
1295                 return RX_CONTINUE;
1296
1297         if (!ieee80211_is_data(hdr->frame_control))
1298                 return RX_CONTINUE;
1299
1300         if (!ieee80211_has_moredata(hdr->frame_control)) {
1301                 /* AP has no more frames buffered for us */
1302                 local->pspolling = false;
1303                 return RX_CONTINUE;
1304         }
1305
1306         /* more data bit is set, let's request a new frame from the AP */
1307         ieee80211_send_pspoll(local, rx->sdata);
1308
1309         return RX_CONTINUE;
1310 }
1311
1312 static void sta_ps_start(struct sta_info *sta)
1313 {
1314         struct ieee80211_sub_if_data *sdata = sta->sdata;
1315         struct ieee80211_local *local = sdata->local;
1316         struct ps_data *ps;
1317         int tid;
1318
1319         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1320             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1321                 ps = &sdata->bss->ps;
1322         else
1323                 return;
1324
1325         atomic_inc(&ps->num_sta_ps);
1326         set_sta_flag(sta, WLAN_STA_PS_STA);
1327         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1328                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1329         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1330                sta->sta.addr, sta->sta.aid);
1331
1332         ieee80211_clear_fast_xmit(sta);
1333
1334         if (!sta->sta.txq[0])
1335                 return;
1336
1337         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1338                 if (txq_has_queue(sta->sta.txq[tid]))
1339                         set_bit(tid, &sta->txq_buffered_tids);
1340                 else
1341                         clear_bit(tid, &sta->txq_buffered_tids);
1342         }
1343 }
1344
1345 static void sta_ps_end(struct sta_info *sta)
1346 {
1347         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1348                sta->sta.addr, sta->sta.aid);
1349
1350         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1351                 /*
1352                  * Clear the flag only if the other one is still set
1353                  * so that the TX path won't start TX'ing new frames
1354                  * directly ... In the case that the driver flag isn't
1355                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1356                  */
1357                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1358                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1359                        sta->sta.addr, sta->sta.aid);
1360                 return;
1361         }
1362
1363         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1364         clear_sta_flag(sta, WLAN_STA_PS_STA);
1365         ieee80211_sta_ps_deliver_wakeup(sta);
1366 }
1367
1368 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1369 {
1370         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1371         bool in_ps;
1372
1373         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1374
1375         /* Don't let the same PS state be set twice */
1376         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1377         if ((start && in_ps) || (!start && !in_ps))
1378                 return -EINVAL;
1379
1380         if (start)
1381                 sta_ps_start(sta);
1382         else
1383                 sta_ps_end(sta);
1384
1385         return 0;
1386 }
1387 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1388
1389 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1390 {
1391         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1392
1393         if (test_sta_flag(sta, WLAN_STA_SP))
1394                 return;
1395
1396         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1397                 ieee80211_sta_ps_deliver_poll_response(sta);
1398         else
1399                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1400 }
1401 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1402
1403 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1404 {
1405         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1406         int ac = ieee80211_ac_from_tid(tid);
1407
1408         /*
1409          * If this AC is not trigger-enabled do nothing unless the
1410          * driver is calling us after it already checked.
1411          *
1412          * NB: This could/should check a separate bitmap of trigger-
1413          * enabled queues, but for now we only implement uAPSD w/o
1414          * TSPEC changes to the ACs, so they're always the same.
1415          */
1416         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1417             tid != IEEE80211_NUM_TIDS)
1418                 return;
1419
1420         /* if we are in a service period, do nothing */
1421         if (test_sta_flag(sta, WLAN_STA_SP))
1422                 return;
1423
1424         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1425                 ieee80211_sta_ps_deliver_uapsd(sta);
1426         else
1427                 set_sta_flag(sta, WLAN_STA_UAPSD);
1428 }
1429 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1430
1431 static ieee80211_rx_result debug_noinline
1432 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1433 {
1434         struct ieee80211_sub_if_data *sdata = rx->sdata;
1435         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1436         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1437
1438         if (!rx->sta)
1439                 return RX_CONTINUE;
1440
1441         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1442             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1443                 return RX_CONTINUE;
1444
1445         /*
1446          * The device handles station powersave, so don't do anything about
1447          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1448          * it to mac80211 since they're handled.)
1449          */
1450         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1451                 return RX_CONTINUE;
1452
1453         /*
1454          * Don't do anything if the station isn't already asleep. In
1455          * the uAPSD case, the station will probably be marked asleep,
1456          * in the PS-Poll case the station must be confused ...
1457          */
1458         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1459                 return RX_CONTINUE;
1460
1461         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1462                 ieee80211_sta_pspoll(&rx->sta->sta);
1463
1464                 /* Free PS Poll skb here instead of returning RX_DROP that would
1465                  * count as an dropped frame. */
1466                 dev_kfree_skb(rx->skb);
1467
1468                 return RX_QUEUED;
1469         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1470                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1471                    ieee80211_has_pm(hdr->frame_control) &&
1472                    (ieee80211_is_data_qos(hdr->frame_control) ||
1473                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1474                 u8 tid;
1475
1476                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1477
1478                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1479         }
1480
1481         return RX_CONTINUE;
1482 }
1483
1484 static ieee80211_rx_result debug_noinline
1485 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1486 {
1487         struct sta_info *sta = rx->sta;
1488         struct sk_buff *skb = rx->skb;
1489         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1490         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1491         int i;
1492
1493         if (!sta)
1494                 return RX_CONTINUE;
1495
1496         /*
1497          * Update last_rx only for IBSS packets which are for the current
1498          * BSSID and for station already AUTHORIZED to avoid keeping the
1499          * current IBSS network alive in cases where other STAs start
1500          * using different BSSID. This will also give the station another
1501          * chance to restart the authentication/authorization in case
1502          * something went wrong the first time.
1503          */
1504         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1505                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1506                                                 NL80211_IFTYPE_ADHOC);
1507                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1508                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1509                         sta->rx_stats.last_rx = jiffies;
1510                         if (ieee80211_is_data(hdr->frame_control) &&
1511                             !is_multicast_ether_addr(hdr->addr1))
1512                                 sta->rx_stats.last_rate =
1513                                         sta_stats_encode_rate(status);
1514                 }
1515         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1516                 sta->rx_stats.last_rx = jiffies;
1517         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1518                 /*
1519                  * Mesh beacons will update last_rx when if they are found to
1520                  * match the current local configuration when processed.
1521                  */
1522                 sta->rx_stats.last_rx = jiffies;
1523                 if (ieee80211_is_data(hdr->frame_control))
1524                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1525         }
1526
1527         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1528                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1529
1530         sta->rx_stats.fragments++;
1531
1532         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1533         sta->rx_stats.bytes += rx->skb->len;
1534         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1535
1536         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1537                 sta->rx_stats.last_signal = status->signal;
1538                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1539         }
1540
1541         if (status->chains) {
1542                 sta->rx_stats.chains = status->chains;
1543                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1544                         int signal = status->chain_signal[i];
1545
1546                         if (!(status->chains & BIT(i)))
1547                                 continue;
1548
1549                         sta->rx_stats.chain_signal_last[i] = signal;
1550                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1551                                         -signal);
1552                 }
1553         }
1554
1555         /*
1556          * Change STA power saving mode only at the end of a frame
1557          * exchange sequence.
1558          */
1559         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1560             !ieee80211_has_morefrags(hdr->frame_control) &&
1561             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1562             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1563              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1564             /* PM bit is only checked in frames where it isn't reserved,
1565              * in AP mode it's reserved in non-bufferable management frames
1566              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1567              */
1568             (!ieee80211_is_mgmt(hdr->frame_control) ||
1569              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1570                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1571                         if (!ieee80211_has_pm(hdr->frame_control))
1572                                 sta_ps_end(sta);
1573                 } else {
1574                         if (ieee80211_has_pm(hdr->frame_control))
1575                                 sta_ps_start(sta);
1576                 }
1577         }
1578
1579         /* mesh power save support */
1580         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1581                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1582
1583         /*
1584          * Drop (qos-)data::nullfunc frames silently, since they
1585          * are used only to control station power saving mode.
1586          */
1587         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1588             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1589                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1590
1591                 /*
1592                  * If we receive a 4-addr nullfunc frame from a STA
1593                  * that was not moved to a 4-addr STA vlan yet send
1594                  * the event to userspace and for older hostapd drop
1595                  * the frame to the monitor interface.
1596                  */
1597                 if (ieee80211_has_a4(hdr->frame_control) &&
1598                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1599                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1600                       !rx->sdata->u.vlan.sta))) {
1601                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1602                                 cfg80211_rx_unexpected_4addr_frame(
1603                                         rx->sdata->dev, sta->sta.addr,
1604                                         GFP_ATOMIC);
1605                         return RX_DROP_MONITOR;
1606                 }
1607                 /*
1608                  * Update counter and free packet here to avoid
1609                  * counting this as a dropped packed.
1610                  */
1611                 sta->rx_stats.packets++;
1612                 dev_kfree_skb(rx->skb);
1613                 return RX_QUEUED;
1614         }
1615
1616         return RX_CONTINUE;
1617 } /* ieee80211_rx_h_sta_process */
1618
1619 static ieee80211_rx_result debug_noinline
1620 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1621 {
1622         struct sk_buff *skb = rx->skb;
1623         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1624         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1625         int keyidx;
1626         int hdrlen;
1627         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1628         struct ieee80211_key *sta_ptk = NULL;
1629         int mmie_keyidx = -1;
1630         __le16 fc;
1631         const struct ieee80211_cipher_scheme *cs = NULL;
1632
1633         /*
1634          * Key selection 101
1635          *
1636          * There are four types of keys:
1637          *  - GTK (group keys)
1638          *  - IGTK (group keys for management frames)
1639          *  - PTK (pairwise keys)
1640          *  - STK (station-to-station pairwise keys)
1641          *
1642          * When selecting a key, we have to distinguish between multicast
1643          * (including broadcast) and unicast frames, the latter can only
1644          * use PTKs and STKs while the former always use GTKs and IGTKs.
1645          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1646          * unicast frames can also use key indices like GTKs. Hence, if we
1647          * don't have a PTK/STK we check the key index for a WEP key.
1648          *
1649          * Note that in a regular BSS, multicast frames are sent by the
1650          * AP only, associated stations unicast the frame to the AP first
1651          * which then multicasts it on their behalf.
1652          *
1653          * There is also a slight problem in IBSS mode: GTKs are negotiated
1654          * with each station, that is something we don't currently handle.
1655          * The spec seems to expect that one negotiates the same key with
1656          * every station but there's no such requirement; VLANs could be
1657          * possible.
1658          */
1659
1660         /* start without a key */
1661         rx->key = NULL;
1662         fc = hdr->frame_control;
1663
1664         if (rx->sta) {
1665                 int keyid = rx->sta->ptk_idx;
1666
1667                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1668                         cs = rx->sta->cipher_scheme;
1669                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1670                         if (unlikely(keyid < 0))
1671                                 return RX_DROP_UNUSABLE;
1672                 }
1673                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1674         }
1675
1676         if (!ieee80211_has_protected(fc))
1677                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1678
1679         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1680                 rx->key = sta_ptk;
1681                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1682                     (status->flag & RX_FLAG_IV_STRIPPED))
1683                         return RX_CONTINUE;
1684                 /* Skip decryption if the frame is not protected. */
1685                 if (!ieee80211_has_protected(fc))
1686                         return RX_CONTINUE;
1687         } else if (mmie_keyidx >= 0) {
1688                 /* Broadcast/multicast robust management frame / BIP */
1689                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1690                     (status->flag & RX_FLAG_IV_STRIPPED))
1691                         return RX_CONTINUE;
1692
1693                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1694                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1695                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1696                 if (rx->sta) {
1697                         if (ieee80211_is_group_privacy_action(skb) &&
1698                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1699                                 return RX_DROP_MONITOR;
1700
1701                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1702                 }
1703                 if (!rx->key)
1704                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1705         } else if (!ieee80211_has_protected(fc)) {
1706                 /*
1707                  * The frame was not protected, so skip decryption. However, we
1708                  * need to set rx->key if there is a key that could have been
1709                  * used so that the frame may be dropped if encryption would
1710                  * have been expected.
1711                  */
1712                 struct ieee80211_key *key = NULL;
1713                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1714                 int i;
1715
1716                 if (ieee80211_is_mgmt(fc) &&
1717                     is_multicast_ether_addr(hdr->addr1) &&
1718                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1719                         rx->key = key;
1720                 else {
1721                         if (rx->sta) {
1722                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1723                                         key = rcu_dereference(rx->sta->gtk[i]);
1724                                         if (key)
1725                                                 break;
1726                                 }
1727                         }
1728                         if (!key) {
1729                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1730                                         key = rcu_dereference(sdata->keys[i]);
1731                                         if (key)
1732                                                 break;
1733                                 }
1734                         }
1735                         if (key)
1736                                 rx->key = key;
1737                 }
1738                 return RX_CONTINUE;
1739         } else {
1740                 u8 keyid;
1741
1742                 /*
1743                  * The device doesn't give us the IV so we won't be
1744                  * able to look up the key. That's ok though, we
1745                  * don't need to decrypt the frame, we just won't
1746                  * be able to keep statistics accurate.
1747                  * Except for key threshold notifications, should
1748                  * we somehow allow the driver to tell us which key
1749                  * the hardware used if this flag is set?
1750                  */
1751                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1752                     (status->flag & RX_FLAG_IV_STRIPPED))
1753                         return RX_CONTINUE;
1754
1755                 hdrlen = ieee80211_hdrlen(fc);
1756
1757                 if (cs) {
1758                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1759
1760                         if (unlikely(keyidx < 0))
1761                                 return RX_DROP_UNUSABLE;
1762                 } else {
1763                         if (rx->skb->len < 8 + hdrlen)
1764                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1765                         /*
1766                          * no need to call ieee80211_wep_get_keyidx,
1767                          * it verifies a bunch of things we've done already
1768                          */
1769                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1770                         keyidx = keyid >> 6;
1771                 }
1772
1773                 /* check per-station GTK first, if multicast packet */
1774                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1775                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1776
1777                 /* if not found, try default key */
1778                 if (!rx->key) {
1779                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1780
1781                         /*
1782                          * RSNA-protected unicast frames should always be
1783                          * sent with pairwise or station-to-station keys,
1784                          * but for WEP we allow using a key index as well.
1785                          */
1786                         if (rx->key &&
1787                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1788                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1789                             !is_multicast_ether_addr(hdr->addr1))
1790                                 rx->key = NULL;
1791                 }
1792         }
1793
1794         if (rx->key) {
1795                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1796                         return RX_DROP_MONITOR;
1797
1798                 /* TODO: add threshold stuff again */
1799         } else {
1800                 return RX_DROP_MONITOR;
1801         }
1802
1803         switch (rx->key->conf.cipher) {
1804         case WLAN_CIPHER_SUITE_WEP40:
1805         case WLAN_CIPHER_SUITE_WEP104:
1806                 result = ieee80211_crypto_wep_decrypt(rx);
1807                 break;
1808         case WLAN_CIPHER_SUITE_TKIP:
1809                 result = ieee80211_crypto_tkip_decrypt(rx);
1810                 break;
1811         case WLAN_CIPHER_SUITE_CCMP:
1812                 result = ieee80211_crypto_ccmp_decrypt(
1813                         rx, IEEE80211_CCMP_MIC_LEN);
1814                 break;
1815         case WLAN_CIPHER_SUITE_CCMP_256:
1816                 result = ieee80211_crypto_ccmp_decrypt(
1817                         rx, IEEE80211_CCMP_256_MIC_LEN);
1818                 break;
1819         case WLAN_CIPHER_SUITE_AES_CMAC:
1820                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1821                 break;
1822         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1823                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1824                 break;
1825         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1826         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1827                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1828                 break;
1829         case WLAN_CIPHER_SUITE_GCMP:
1830         case WLAN_CIPHER_SUITE_GCMP_256:
1831                 result = ieee80211_crypto_gcmp_decrypt(rx);
1832                 break;
1833         default:
1834                 result = ieee80211_crypto_hw_decrypt(rx);
1835         }
1836
1837         /* the hdr variable is invalid after the decrypt handlers */
1838
1839         /* either the frame has been decrypted or will be dropped */
1840         status->flag |= RX_FLAG_DECRYPTED;
1841
1842         return result;
1843 }
1844
1845 static inline struct ieee80211_fragment_entry *
1846 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1847                          unsigned int frag, unsigned int seq, int rx_queue,
1848                          struct sk_buff **skb)
1849 {
1850         struct ieee80211_fragment_entry *entry;
1851
1852         entry = &sdata->fragments[sdata->fragment_next++];
1853         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1854                 sdata->fragment_next = 0;
1855
1856         if (!skb_queue_empty(&entry->skb_list))
1857                 __skb_queue_purge(&entry->skb_list);
1858
1859         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1860         *skb = NULL;
1861         entry->first_frag_time = jiffies;
1862         entry->seq = seq;
1863         entry->rx_queue = rx_queue;
1864         entry->last_frag = frag;
1865         entry->check_sequential_pn = false;
1866         entry->extra_len = 0;
1867
1868         return entry;
1869 }
1870
1871 static inline struct ieee80211_fragment_entry *
1872 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1873                           unsigned int frag, unsigned int seq,
1874                           int rx_queue, struct ieee80211_hdr *hdr)
1875 {
1876         struct ieee80211_fragment_entry *entry;
1877         int i, idx;
1878
1879         idx = sdata->fragment_next;
1880         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1881                 struct ieee80211_hdr *f_hdr;
1882
1883                 idx--;
1884                 if (idx < 0)
1885                         idx = IEEE80211_FRAGMENT_MAX - 1;
1886
1887                 entry = &sdata->fragments[idx];
1888                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1889                     entry->rx_queue != rx_queue ||
1890                     entry->last_frag + 1 != frag)
1891                         continue;
1892
1893                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1894
1895                 /*
1896                  * Check ftype and addresses are equal, else check next fragment
1897                  */
1898                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1899                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1900                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1901                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1902                         continue;
1903
1904                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1905                         __skb_queue_purge(&entry->skb_list);
1906                         continue;
1907                 }
1908                 return entry;
1909         }
1910
1911         return NULL;
1912 }
1913
1914 static ieee80211_rx_result debug_noinline
1915 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1916 {
1917         struct ieee80211_hdr *hdr;
1918         u16 sc;
1919         __le16 fc;
1920         unsigned int frag, seq;
1921         struct ieee80211_fragment_entry *entry;
1922         struct sk_buff *skb;
1923
1924         hdr = (struct ieee80211_hdr *)rx->skb->data;
1925         fc = hdr->frame_control;
1926
1927         if (ieee80211_is_ctl(fc))
1928                 return RX_CONTINUE;
1929
1930         sc = le16_to_cpu(hdr->seq_ctrl);
1931         frag = sc & IEEE80211_SCTL_FRAG;
1932
1933         if (is_multicast_ether_addr(hdr->addr1)) {
1934                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1935                 goto out_no_led;
1936         }
1937
1938         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1939                 goto out;
1940
1941         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1942
1943         if (skb_linearize(rx->skb))
1944                 return RX_DROP_UNUSABLE;
1945
1946         /*
1947          *  skb_linearize() might change the skb->data and
1948          *  previously cached variables (in this case, hdr) need to
1949          *  be refreshed with the new data.
1950          */
1951         hdr = (struct ieee80211_hdr *)rx->skb->data;
1952         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1953
1954         if (frag == 0) {
1955                 /* This is the first fragment of a new frame. */
1956                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1957                                                  rx->seqno_idx, &(rx->skb));
1958                 if (rx->key &&
1959                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1960                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1961                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1962                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1963                     ieee80211_has_protected(fc)) {
1964                         int queue = rx->security_idx;
1965
1966                         /* Store CCMP/GCMP PN so that we can verify that the
1967                          * next fragment has a sequential PN value.
1968                          */
1969                         entry->check_sequential_pn = true;
1970                         memcpy(entry->last_pn,
1971                                rx->key->u.ccmp.rx_pn[queue],
1972                                IEEE80211_CCMP_PN_LEN);
1973                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1974                                               u.ccmp.rx_pn) !=
1975                                      offsetof(struct ieee80211_key,
1976                                               u.gcmp.rx_pn));
1977                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1978                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1979                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1980                                      IEEE80211_GCMP_PN_LEN);
1981                 }
1982                 return RX_QUEUED;
1983         }
1984
1985         /* This is a fragment for a frame that should already be pending in
1986          * fragment cache. Add this fragment to the end of the pending entry.
1987          */
1988         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1989                                           rx->seqno_idx, hdr);
1990         if (!entry) {
1991                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1992                 return RX_DROP_MONITOR;
1993         }
1994
1995         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1996          *  MPDU PN values are not incrementing in steps of 1."
1997          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1998          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1999          */
2000         if (entry->check_sequential_pn) {
2001                 int i;
2002                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2003                 int queue;
2004
2005                 if (!rx->key ||
2006                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2007                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2008                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2009                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2010                         return RX_DROP_UNUSABLE;
2011                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2012                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2013                         pn[i]++;
2014                         if (pn[i])
2015                                 break;
2016                 }
2017                 queue = rx->security_idx;
2018                 rpn = rx->key->u.ccmp.rx_pn[queue];
2019                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2020                         return RX_DROP_UNUSABLE;
2021                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2022         }
2023
2024         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2025         __skb_queue_tail(&entry->skb_list, rx->skb);
2026         entry->last_frag = frag;
2027         entry->extra_len += rx->skb->len;
2028         if (ieee80211_has_morefrags(fc)) {
2029                 rx->skb = NULL;
2030                 return RX_QUEUED;
2031         }
2032
2033         rx->skb = __skb_dequeue(&entry->skb_list);
2034         if (skb_tailroom(rx->skb) < entry->extra_len) {
2035                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2036                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2037                                               GFP_ATOMIC))) {
2038                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2039                         __skb_queue_purge(&entry->skb_list);
2040                         return RX_DROP_UNUSABLE;
2041                 }
2042         }
2043         while ((skb = __skb_dequeue(&entry->skb_list))) {
2044                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2045                 dev_kfree_skb(skb);
2046         }
2047
2048  out:
2049         ieee80211_led_rx(rx->local);
2050  out_no_led:
2051         if (rx->sta)
2052                 rx->sta->rx_stats.packets++;
2053         return RX_CONTINUE;
2054 }
2055
2056 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2057 {
2058         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2059                 return -EACCES;
2060
2061         return 0;
2062 }
2063
2064 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2065 {
2066         struct sk_buff *skb = rx->skb;
2067         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2068
2069         /*
2070          * Pass through unencrypted frames if the hardware has
2071          * decrypted them already.
2072          */
2073         if (status->flag & RX_FLAG_DECRYPTED)
2074                 return 0;
2075
2076         /* Drop unencrypted frames if key is set. */
2077         if (unlikely(!ieee80211_has_protected(fc) &&
2078                      !ieee80211_is_nullfunc(fc) &&
2079                      ieee80211_is_data(fc) && rx->key))
2080                 return -EACCES;
2081
2082         return 0;
2083 }
2084
2085 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2086 {
2087         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2088         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2089         __le16 fc = hdr->frame_control;
2090
2091         /*
2092          * Pass through unencrypted frames if the hardware has
2093          * decrypted them already.
2094          */
2095         if (status->flag & RX_FLAG_DECRYPTED)
2096                 return 0;
2097
2098         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2099                 if (unlikely(!ieee80211_has_protected(fc) &&
2100                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2101                              rx->key)) {
2102                         if (ieee80211_is_deauth(fc) ||
2103                             ieee80211_is_disassoc(fc))
2104                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2105                                                              rx->skb->data,
2106                                                              rx->skb->len);
2107                         return -EACCES;
2108                 }
2109                 /* BIP does not use Protected field, so need to check MMIE */
2110                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2111                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2112                         if (ieee80211_is_deauth(fc) ||
2113                             ieee80211_is_disassoc(fc))
2114                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2115                                                              rx->skb->data,
2116                                                              rx->skb->len);
2117                         return -EACCES;
2118                 }
2119                 /*
2120                  * When using MFP, Action frames are not allowed prior to
2121                  * having configured keys.
2122                  */
2123                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2124                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2125                         return -EACCES;
2126         }
2127
2128         return 0;
2129 }
2130
2131 static int
2132 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2133 {
2134         struct ieee80211_sub_if_data *sdata = rx->sdata;
2135         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2136         bool check_port_control = false;
2137         struct ethhdr *ehdr;
2138         int ret;
2139
2140         *port_control = false;
2141         if (ieee80211_has_a4(hdr->frame_control) &&
2142             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2143                 return -1;
2144
2145         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2146             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2147
2148                 if (!sdata->u.mgd.use_4addr)
2149                         return -1;
2150                 else
2151                         check_port_control = true;
2152         }
2153
2154         if (is_multicast_ether_addr(hdr->addr1) &&
2155             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2156                 return -1;
2157
2158         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2159         if (ret < 0)
2160                 return ret;
2161
2162         ehdr = (struct ethhdr *) rx->skb->data;
2163         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2164                 *port_control = true;
2165         else if (check_port_control)
2166                 return -1;
2167
2168         return 0;
2169 }
2170
2171 /*
2172  * requires that rx->skb is a frame with ethernet header
2173  */
2174 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2175 {
2176         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2177                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2178         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2179
2180         /*
2181          * Allow EAPOL frames to us/the PAE group address regardless
2182          * of whether the frame was encrypted or not.
2183          */
2184         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2185             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2186              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2187                 return true;
2188
2189         if (ieee80211_802_1x_port_control(rx) ||
2190             ieee80211_drop_unencrypted(rx, fc))
2191                 return false;
2192
2193         return true;
2194 }
2195
2196 /*
2197  * requires that rx->skb is a frame with ethernet header
2198  */
2199 static void
2200 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2201 {
2202         struct ieee80211_sub_if_data *sdata = rx->sdata;
2203         struct net_device *dev = sdata->dev;
2204         struct sk_buff *skb, *xmit_skb;
2205         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2206         struct sta_info *dsta;
2207
2208         skb = rx->skb;
2209         xmit_skb = NULL;
2210
2211         ieee80211_rx_stats(dev, skb->len);
2212
2213         if (rx->sta) {
2214                 /* The seqno index has the same property as needed
2215                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2216                  * for non-QoS-data frames. Here we know it's a data
2217                  * frame, so count MSDUs.
2218                  */
2219                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2220                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2221                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2222         }
2223
2224         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2225              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2226             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2227             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2228                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2229                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2230                         /*
2231                          * send multicast frames both to higher layers in
2232                          * local net stack and back to the wireless medium
2233                          */
2234                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2235                         if (!xmit_skb)
2236                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2237                                                     dev->name);
2238                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2239                         dsta = sta_info_get(sdata, skb->data);
2240                         if (dsta) {
2241                                 /*
2242                                  * The destination station is associated to
2243                                  * this AP (in this VLAN), so send the frame
2244                                  * directly to it and do not pass it to local
2245                                  * net stack.
2246                                  */
2247                                 xmit_skb = skb;
2248                                 skb = NULL;
2249                         }
2250                 }
2251         }
2252
2253 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2254         if (skb) {
2255                 /* 'align' will only take the values 0 or 2 here since all
2256                  * frames are required to be aligned to 2-byte boundaries
2257                  * when being passed to mac80211; the code here works just
2258                  * as well if that isn't true, but mac80211 assumes it can
2259                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2260                  */
2261                 int align;
2262
2263                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2264                 if (align) {
2265                         if (WARN_ON(skb_headroom(skb) < 3)) {
2266                                 dev_kfree_skb(skb);
2267                                 skb = NULL;
2268                         } else {
2269                                 u8 *data = skb->data;
2270                                 size_t len = skb_headlen(skb);
2271                                 skb->data -= align;
2272                                 memmove(skb->data, data, len);
2273                                 skb_set_tail_pointer(skb, len);
2274                         }
2275                 }
2276         }
2277 #endif
2278
2279         if (skb) {
2280                 /* deliver to local stack */
2281                 skb->protocol = eth_type_trans(skb, dev);
2282                 memset(skb->cb, 0, sizeof(skb->cb));
2283                 if (rx->napi)
2284                         napi_gro_receive(rx->napi, skb);
2285                 else
2286                         netif_receive_skb(skb);
2287         }
2288
2289         if (xmit_skb) {
2290                 /*
2291                  * Send to wireless media and increase priority by 256 to
2292                  * keep the received priority instead of reclassifying
2293                  * the frame (see cfg80211_classify8021d).
2294                  */
2295                 xmit_skb->priority += 256;
2296                 xmit_skb->protocol = htons(ETH_P_802_3);
2297                 skb_reset_network_header(xmit_skb);
2298                 skb_reset_mac_header(xmit_skb);
2299                 dev_queue_xmit(xmit_skb);
2300         }
2301 }
2302
2303 static ieee80211_rx_result debug_noinline
2304 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2305 {
2306         struct net_device *dev = rx->sdata->dev;
2307         struct sk_buff *skb = rx->skb;
2308         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2309         __le16 fc = hdr->frame_control;
2310         struct sk_buff_head frame_list;
2311         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2312         struct ethhdr ethhdr;
2313         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2314
2315         if (unlikely(!ieee80211_is_data(fc)))
2316                 return RX_CONTINUE;
2317
2318         if (unlikely(!ieee80211_is_data_present(fc)))
2319                 return RX_DROP_MONITOR;
2320
2321         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2322                 return RX_CONTINUE;
2323
2324         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2325                 switch (rx->sdata->vif.type) {
2326                 case NL80211_IFTYPE_AP_VLAN:
2327                         if (!rx->sdata->u.vlan.sta)
2328                                 return RX_DROP_UNUSABLE;
2329                         break;
2330                 case NL80211_IFTYPE_STATION:
2331                         if (!rx->sdata->u.mgd.use_4addr)
2332                                 return RX_DROP_UNUSABLE;
2333                         break;
2334                 default:
2335                         return RX_DROP_UNUSABLE;
2336                 }
2337                 check_da = NULL;
2338                 check_sa = NULL;
2339         } else switch (rx->sdata->vif.type) {
2340                 case NL80211_IFTYPE_AP:
2341                 case NL80211_IFTYPE_AP_VLAN:
2342                         check_da = NULL;
2343                         break;
2344                 case NL80211_IFTYPE_STATION:
2345                         if (!rx->sta ||
2346                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2347                                 check_sa = NULL;
2348                         break;
2349                 case NL80211_IFTYPE_MESH_POINT:
2350                         check_sa = NULL;
2351                         break;
2352                 default:
2353                         break;
2354         }
2355
2356         if (is_multicast_ether_addr(hdr->addr1))
2357                 return RX_DROP_UNUSABLE;
2358
2359         skb->dev = dev;
2360         __skb_queue_head_init(&frame_list);
2361
2362         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2363                                           rx->sdata->vif.addr,
2364                                           rx->sdata->vif.type))
2365                 return RX_DROP_UNUSABLE;
2366
2367         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2368                                  rx->sdata->vif.type,
2369                                  rx->local->hw.extra_tx_headroom,
2370                                  check_da, check_sa);
2371
2372         while (!skb_queue_empty(&frame_list)) {
2373                 rx->skb = __skb_dequeue(&frame_list);
2374
2375                 if (!ieee80211_frame_allowed(rx, fc)) {
2376                         dev_kfree_skb(rx->skb);
2377                         continue;
2378                 }
2379
2380                 ieee80211_deliver_skb(rx);
2381         }
2382
2383         return RX_QUEUED;
2384 }
2385
2386 #ifdef CONFIG_MAC80211_MESH
2387 static ieee80211_rx_result
2388 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2389 {
2390         struct ieee80211_hdr *fwd_hdr, *hdr;
2391         struct ieee80211_tx_info *info;
2392         struct ieee80211s_hdr *mesh_hdr;
2393         struct sk_buff *skb = rx->skb, *fwd_skb;
2394         struct ieee80211_local *local = rx->local;
2395         struct ieee80211_sub_if_data *sdata = rx->sdata;
2396         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2397         u16 ac, q, hdrlen;
2398
2399         hdr = (struct ieee80211_hdr *) skb->data;
2400         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2401
2402         /* make sure fixed part of mesh header is there, also checks skb len */
2403         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2404                 return RX_DROP_MONITOR;
2405
2406         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2407
2408         /* make sure full mesh header is there, also checks skb len */
2409         if (!pskb_may_pull(rx->skb,
2410                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2411                 return RX_DROP_MONITOR;
2412
2413         /* reload pointers */
2414         hdr = (struct ieee80211_hdr *) skb->data;
2415         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2416
2417         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2418                 return RX_DROP_MONITOR;
2419
2420         /* frame is in RMC, don't forward */
2421         if (ieee80211_is_data(hdr->frame_control) &&
2422             is_multicast_ether_addr(hdr->addr1) &&
2423             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2424                 return RX_DROP_MONITOR;
2425
2426         if (!ieee80211_is_data(hdr->frame_control))
2427                 return RX_CONTINUE;
2428
2429         if (!mesh_hdr->ttl)
2430                 return RX_DROP_MONITOR;
2431
2432         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2433                 struct mesh_path *mppath;
2434                 char *proxied_addr;
2435                 char *mpp_addr;
2436
2437                 if (is_multicast_ether_addr(hdr->addr1)) {
2438                         mpp_addr = hdr->addr3;
2439                         proxied_addr = mesh_hdr->eaddr1;
2440                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2441                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2442                         mpp_addr = hdr->addr4;
2443                         proxied_addr = mesh_hdr->eaddr2;
2444                 } else {
2445                         return RX_DROP_MONITOR;
2446                 }
2447
2448                 rcu_read_lock();
2449                 mppath = mpp_path_lookup(sdata, proxied_addr);
2450                 if (!mppath) {
2451                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2452                 } else {
2453                         spin_lock_bh(&mppath->state_lock);
2454                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2455                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2456                         mppath->exp_time = jiffies;
2457                         spin_unlock_bh(&mppath->state_lock);
2458                 }
2459                 rcu_read_unlock();
2460         }
2461
2462         /* Frame has reached destination.  Don't forward */
2463         if (!is_multicast_ether_addr(hdr->addr1) &&
2464             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2465                 return RX_CONTINUE;
2466
2467         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2468         q = sdata->vif.hw_queue[ac];
2469         if (ieee80211_queue_stopped(&local->hw, q)) {
2470                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2471                 return RX_DROP_MONITOR;
2472         }
2473         skb_set_queue_mapping(skb, q);
2474
2475         if (!--mesh_hdr->ttl) {
2476                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2477                 goto out;
2478         }
2479
2480         if (!ifmsh->mshcfg.dot11MeshForwarding)
2481                 goto out;
2482
2483         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2484                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2485         if (!fwd_skb) {
2486                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2487                                     sdata->name);
2488                 goto out;
2489         }
2490
2491         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2492         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2493         info = IEEE80211_SKB_CB(fwd_skb);
2494         memset(info, 0, sizeof(*info));
2495         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2496         info->control.vif = &rx->sdata->vif;
2497         info->control.jiffies = jiffies;
2498         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2499                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2500                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2501                 /* update power mode indication when forwarding */
2502                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2503         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2504                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2505                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2506         } else {
2507                 /* unable to resolve next hop */
2508                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2509                                    fwd_hdr->addr3, 0,
2510                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2511                                    fwd_hdr->addr2);
2512                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2513                 kfree_skb(fwd_skb);
2514                 return RX_DROP_MONITOR;
2515         }
2516
2517         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2518         ieee80211_add_pending_skb(local, fwd_skb);
2519  out:
2520         if (is_multicast_ether_addr(hdr->addr1))
2521                 return RX_CONTINUE;
2522         return RX_DROP_MONITOR;
2523 }
2524 #endif
2525
2526 static ieee80211_rx_result debug_noinline
2527 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2528 {
2529         struct ieee80211_sub_if_data *sdata = rx->sdata;
2530         struct ieee80211_local *local = rx->local;
2531         struct net_device *dev = sdata->dev;
2532         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2533         __le16 fc = hdr->frame_control;
2534         bool port_control;
2535         int err;
2536
2537         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2538                 return RX_CONTINUE;
2539
2540         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2541                 return RX_DROP_MONITOR;
2542
2543         /*
2544          * Send unexpected-4addr-frame event to hostapd. For older versions,
2545          * also drop the frame to cooked monitor interfaces.
2546          */
2547         if (ieee80211_has_a4(hdr->frame_control) &&
2548             sdata->vif.type == NL80211_IFTYPE_AP) {
2549                 if (rx->sta &&
2550                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2551                         cfg80211_rx_unexpected_4addr_frame(
2552                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2553                 return RX_DROP_MONITOR;
2554         }
2555
2556         err = __ieee80211_data_to_8023(rx, &port_control);
2557         if (unlikely(err))
2558                 return RX_DROP_UNUSABLE;
2559
2560         if (!ieee80211_frame_allowed(rx, fc))
2561                 return RX_DROP_MONITOR;
2562
2563         /* directly handle TDLS channel switch requests/responses */
2564         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2565                                                 cpu_to_be16(ETH_P_TDLS))) {
2566                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2567
2568                 if (pskb_may_pull(rx->skb,
2569                                   offsetof(struct ieee80211_tdls_data, u)) &&
2570                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2571                     tf->category == WLAN_CATEGORY_TDLS &&
2572                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2573                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2574                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2575                         schedule_work(&local->tdls_chsw_work);
2576                         if (rx->sta)
2577                                 rx->sta->rx_stats.packets++;
2578
2579                         return RX_QUEUED;
2580                 }
2581         }
2582
2583         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2584             unlikely(port_control) && sdata->bss) {
2585                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2586                                      u.ap);
2587                 dev = sdata->dev;
2588                 rx->sdata = sdata;
2589         }
2590
2591         rx->skb->dev = dev;
2592
2593         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2594             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2595             !is_multicast_ether_addr(
2596                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2597             (!local->scanning &&
2598              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2599                 mod_timer(&local->dynamic_ps_timer, jiffies +
2600                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2601
2602         ieee80211_deliver_skb(rx);
2603
2604         return RX_QUEUED;
2605 }
2606
2607 static ieee80211_rx_result debug_noinline
2608 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2609 {
2610         struct sk_buff *skb = rx->skb;
2611         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2612         struct tid_ampdu_rx *tid_agg_rx;
2613         u16 start_seq_num;
2614         u16 tid;
2615
2616         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2617                 return RX_CONTINUE;
2618
2619         if (ieee80211_is_back_req(bar->frame_control)) {
2620                 struct {
2621                         __le16 control, start_seq_num;
2622                 } __packed bar_data;
2623                 struct ieee80211_event event = {
2624                         .type = BAR_RX_EVENT,
2625                 };
2626
2627                 if (!rx->sta)
2628                         return RX_DROP_MONITOR;
2629
2630                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2631                                   &bar_data, sizeof(bar_data)))
2632                         return RX_DROP_MONITOR;
2633
2634                 tid = le16_to_cpu(bar_data.control) >> 12;
2635
2636                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2637                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2638                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2639                                              WLAN_BACK_RECIPIENT,
2640                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2641
2642                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2643                 if (!tid_agg_rx)
2644                         return RX_DROP_MONITOR;
2645
2646                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2647                 event.u.ba.tid = tid;
2648                 event.u.ba.ssn = start_seq_num;
2649                 event.u.ba.sta = &rx->sta->sta;
2650
2651                 /* reset session timer */
2652                 if (tid_agg_rx->timeout)
2653                         mod_timer(&tid_agg_rx->session_timer,
2654                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2655
2656                 spin_lock(&tid_agg_rx->reorder_lock);
2657                 /* release stored frames up to start of BAR */
2658                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2659                                                  start_seq_num, frames);
2660                 spin_unlock(&tid_agg_rx->reorder_lock);
2661
2662                 drv_event_callback(rx->local, rx->sdata, &event);
2663
2664                 kfree_skb(skb);
2665                 return RX_QUEUED;
2666         }
2667
2668         /*
2669          * After this point, we only want management frames,
2670          * so we can drop all remaining control frames to
2671          * cooked monitor interfaces.
2672          */
2673         return RX_DROP_MONITOR;
2674 }
2675
2676 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2677                                            struct ieee80211_mgmt *mgmt,
2678                                            size_t len)
2679 {
2680         struct ieee80211_local *local = sdata->local;
2681         struct sk_buff *skb;
2682         struct ieee80211_mgmt *resp;
2683
2684         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2685                 /* Not to own unicast address */
2686                 return;
2687         }
2688
2689         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2690             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2691                 /* Not from the current AP or not associated yet. */
2692                 return;
2693         }
2694
2695         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2696                 /* Too short SA Query request frame */
2697                 return;
2698         }
2699
2700         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2701         if (skb == NULL)
2702                 return;
2703
2704         skb_reserve(skb, local->hw.extra_tx_headroom);
2705         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2706         memset(resp, 0, 24);
2707         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2708         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2709         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2710         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2711                                           IEEE80211_STYPE_ACTION);
2712         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2713         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2714         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2715         memcpy(resp->u.action.u.sa_query.trans_id,
2716                mgmt->u.action.u.sa_query.trans_id,
2717                WLAN_SA_QUERY_TR_ID_LEN);
2718
2719         ieee80211_tx_skb(sdata, skb);
2720 }
2721
2722 static ieee80211_rx_result debug_noinline
2723 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2724 {
2725         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2726         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2727
2728         /*
2729          * From here on, look only at management frames.
2730          * Data and control frames are already handled,
2731          * and unknown (reserved) frames are useless.
2732          */
2733         if (rx->skb->len < 24)
2734                 return RX_DROP_MONITOR;
2735
2736         if (!ieee80211_is_mgmt(mgmt->frame_control))
2737                 return RX_DROP_MONITOR;
2738
2739         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2740             ieee80211_is_beacon(mgmt->frame_control) &&
2741             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2742                 int sig = 0;
2743
2744                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2745                         sig = status->signal;
2746
2747                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2748                                             rx->skb->data, rx->skb->len,
2749                                             status->freq, sig);
2750                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2751         }
2752
2753         if (ieee80211_drop_unencrypted_mgmt(rx))
2754                 return RX_DROP_UNUSABLE;
2755
2756         return RX_CONTINUE;
2757 }
2758
2759 static ieee80211_rx_result debug_noinline
2760 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2761 {
2762         struct ieee80211_local *local = rx->local;
2763         struct ieee80211_sub_if_data *sdata = rx->sdata;
2764         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2765         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2766         int len = rx->skb->len;
2767
2768         if (!ieee80211_is_action(mgmt->frame_control))
2769                 return RX_CONTINUE;
2770
2771         /* drop too small frames */
2772         if (len < IEEE80211_MIN_ACTION_SIZE)
2773                 return RX_DROP_UNUSABLE;
2774
2775         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2776             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2777             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2778                 return RX_DROP_UNUSABLE;
2779
2780         switch (mgmt->u.action.category) {
2781         case WLAN_CATEGORY_HT:
2782                 /* reject HT action frames from stations not supporting HT */
2783                 if (!rx->sta->sta.ht_cap.ht_supported)
2784                         goto invalid;
2785
2786                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2787                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2788                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2789                     sdata->vif.type != NL80211_IFTYPE_AP &&
2790                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2791                         break;
2792
2793                 /* verify action & smps_control/chanwidth are present */
2794                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2795                         goto invalid;
2796
2797                 switch (mgmt->u.action.u.ht_smps.action) {
2798                 case WLAN_HT_ACTION_SMPS: {
2799                         struct ieee80211_supported_band *sband;
2800                         enum ieee80211_smps_mode smps_mode;
2801
2802                         /* convert to HT capability */
2803                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2804                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2805                                 smps_mode = IEEE80211_SMPS_OFF;
2806                                 break;
2807                         case WLAN_HT_SMPS_CONTROL_STATIC:
2808                                 smps_mode = IEEE80211_SMPS_STATIC;
2809                                 break;
2810                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2811                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2812                                 break;
2813                         default:
2814                                 goto invalid;
2815                         }
2816
2817                         /* if no change do nothing */
2818                         if (rx->sta->sta.smps_mode == smps_mode)
2819                                 goto handled;
2820                         rx->sta->sta.smps_mode = smps_mode;
2821
2822                         sband = rx->local->hw.wiphy->bands[status->band];
2823
2824                         rate_control_rate_update(local, sband, rx->sta,
2825                                                  IEEE80211_RC_SMPS_CHANGED);
2826                         goto handled;
2827                 }
2828                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2829                         struct ieee80211_supported_band *sband;
2830                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2831                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2832
2833                         /* If it doesn't support 40 MHz it can't change ... */
2834                         if (!(rx->sta->sta.ht_cap.cap &
2835                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2836                                 goto handled;
2837
2838                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2839                                 max_bw = IEEE80211_STA_RX_BW_20;
2840                         else
2841                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2842
2843                         /* set cur_max_bandwidth and recalc sta bw */
2844                         rx->sta->cur_max_bandwidth = max_bw;
2845                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2846
2847                         if (rx->sta->sta.bandwidth == new_bw)
2848                                 goto handled;
2849
2850                         rx->sta->sta.bandwidth = new_bw;
2851                         sband = rx->local->hw.wiphy->bands[status->band];
2852
2853                         rate_control_rate_update(local, sband, rx->sta,
2854                                                  IEEE80211_RC_BW_CHANGED);
2855                         goto handled;
2856                 }
2857                 default:
2858                         goto invalid;
2859                 }
2860
2861                 break;
2862         case WLAN_CATEGORY_PUBLIC:
2863                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2864                         goto invalid;
2865                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2866                         break;
2867                 if (!rx->sta)
2868                         break;
2869                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2870                         break;
2871                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2872                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2873                         break;
2874                 if (len < offsetof(struct ieee80211_mgmt,
2875                                    u.action.u.ext_chan_switch.variable))
2876                         goto invalid;
2877                 goto queue;
2878         case WLAN_CATEGORY_VHT:
2879                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2880                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2881                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2882                     sdata->vif.type != NL80211_IFTYPE_AP &&
2883                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2884                         break;
2885
2886                 /* verify action code is present */
2887                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2888                         goto invalid;
2889
2890                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2891                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2892                         /* verify opmode is present */
2893                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2894                                 goto invalid;
2895                         goto queue;
2896                 }
2897                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2898                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2899                                 goto invalid;
2900                         goto queue;
2901                 }
2902                 default:
2903                         break;
2904                 }
2905                 break;
2906         case WLAN_CATEGORY_BACK:
2907                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2908                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2909                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2910                     sdata->vif.type != NL80211_IFTYPE_AP &&
2911                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2912                         break;
2913
2914                 /* verify action_code is present */
2915                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2916                         break;
2917
2918                 switch (mgmt->u.action.u.addba_req.action_code) {
2919                 case WLAN_ACTION_ADDBA_REQ:
2920                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2921                                    sizeof(mgmt->u.action.u.addba_req)))
2922                                 goto invalid;
2923                         break;
2924                 case WLAN_ACTION_ADDBA_RESP:
2925                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2926                                    sizeof(mgmt->u.action.u.addba_resp)))
2927                                 goto invalid;
2928                         break;
2929                 case WLAN_ACTION_DELBA:
2930                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2931                                    sizeof(mgmt->u.action.u.delba)))
2932                                 goto invalid;
2933                         break;
2934                 default:
2935                         goto invalid;
2936                 }
2937
2938                 goto queue;
2939         case WLAN_CATEGORY_SPECTRUM_MGMT:
2940                 /* verify action_code is present */
2941                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2942                         break;
2943
2944                 switch (mgmt->u.action.u.measurement.action_code) {
2945                 case WLAN_ACTION_SPCT_MSR_REQ:
2946                         if (status->band != NL80211_BAND_5GHZ)
2947                                 break;
2948
2949                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2950                                    sizeof(mgmt->u.action.u.measurement)))
2951                                 break;
2952
2953                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2954                                 break;
2955
2956                         ieee80211_process_measurement_req(sdata, mgmt, len);
2957                         goto handled;
2958                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2959                         u8 *bssid;
2960                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2961                                    sizeof(mgmt->u.action.u.chan_switch)))
2962                                 break;
2963
2964                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2965                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2966                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2967                                 break;
2968
2969                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2970                                 bssid = sdata->u.mgd.bssid;
2971                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2972                                 bssid = sdata->u.ibss.bssid;
2973                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2974                                 bssid = mgmt->sa;
2975                         else
2976                                 break;
2977
2978                         if (!ether_addr_equal(mgmt->bssid, bssid))
2979                                 break;
2980
2981                         goto queue;
2982                         }
2983                 }
2984                 break;
2985         case WLAN_CATEGORY_SA_QUERY:
2986                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2987                            sizeof(mgmt->u.action.u.sa_query)))
2988                         break;
2989
2990                 switch (mgmt->u.action.u.sa_query.action) {
2991                 case WLAN_ACTION_SA_QUERY_REQUEST:
2992                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2993                                 break;
2994                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2995                         goto handled;
2996                 }
2997                 break;
2998         case WLAN_CATEGORY_SELF_PROTECTED:
2999                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3000                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3001                         break;
3002
3003                 switch (mgmt->u.action.u.self_prot.action_code) {
3004                 case WLAN_SP_MESH_PEERING_OPEN:
3005                 case WLAN_SP_MESH_PEERING_CLOSE:
3006                 case WLAN_SP_MESH_PEERING_CONFIRM:
3007                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3008                                 goto invalid;
3009                         if (sdata->u.mesh.user_mpm)
3010                                 /* userspace handles this frame */
3011                                 break;
3012                         goto queue;
3013                 case WLAN_SP_MGK_INFORM:
3014                 case WLAN_SP_MGK_ACK:
3015                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3016                                 goto invalid;
3017                         break;
3018                 }
3019                 break;
3020         case WLAN_CATEGORY_MESH_ACTION:
3021                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3022                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3023                         break;
3024
3025                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3026                         break;
3027                 if (mesh_action_is_path_sel(mgmt) &&
3028                     !mesh_path_sel_is_hwmp(sdata))
3029                         break;
3030                 goto queue;
3031         }
3032
3033         return RX_CONTINUE;
3034
3035  invalid:
3036         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3037         /* will return in the next handlers */
3038         return RX_CONTINUE;
3039
3040  handled:
3041         if (rx->sta)
3042                 rx->sta->rx_stats.packets++;
3043         dev_kfree_skb(rx->skb);
3044         return RX_QUEUED;
3045
3046  queue:
3047         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3048         skb_queue_tail(&sdata->skb_queue, rx->skb);
3049         ieee80211_queue_work(&local->hw, &sdata->work);
3050         if (rx->sta)
3051                 rx->sta->rx_stats.packets++;
3052         return RX_QUEUED;
3053 }
3054
3055 static ieee80211_rx_result debug_noinline
3056 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3057 {
3058         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3059         int sig = 0;
3060
3061         /* skip known-bad action frames and return them in the next handler */
3062         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3063                 return RX_CONTINUE;
3064
3065         /*
3066          * Getting here means the kernel doesn't know how to handle
3067          * it, but maybe userspace does ... include returned frames
3068          * so userspace can register for those to know whether ones
3069          * it transmitted were processed or returned.
3070          */
3071
3072         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3073                 sig = status->signal;
3074
3075         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3076                              rx->skb->data, rx->skb->len, 0)) {
3077                 if (rx->sta)
3078                         rx->sta->rx_stats.packets++;
3079                 dev_kfree_skb(rx->skb);
3080                 return RX_QUEUED;
3081         }
3082
3083         return RX_CONTINUE;
3084 }
3085
3086 static ieee80211_rx_result debug_noinline
3087 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3088 {
3089         struct ieee80211_local *local = rx->local;
3090         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3091         struct sk_buff *nskb;
3092         struct ieee80211_sub_if_data *sdata = rx->sdata;
3093         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3094
3095         if (!ieee80211_is_action(mgmt->frame_control))
3096                 return RX_CONTINUE;
3097
3098         /*
3099          * For AP mode, hostapd is responsible for handling any action
3100          * frames that we didn't handle, including returning unknown
3101          * ones. For all other modes we will return them to the sender,
3102          * setting the 0x80 bit in the action category, as required by
3103          * 802.11-2012 9.24.4.
3104          * Newer versions of hostapd shall also use the management frame
3105          * registration mechanisms, but older ones still use cooked
3106          * monitor interfaces so push all frames there.
3107          */
3108         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3109             (sdata->vif.type == NL80211_IFTYPE_AP ||
3110              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3111                 return RX_DROP_MONITOR;
3112
3113         if (is_multicast_ether_addr(mgmt->da))
3114                 return RX_DROP_MONITOR;
3115
3116         /* do not return rejected action frames */
3117         if (mgmt->u.action.category & 0x80)
3118                 return RX_DROP_UNUSABLE;
3119
3120         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3121                                GFP_ATOMIC);
3122         if (nskb) {
3123                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3124
3125                 nmgmt->u.action.category |= 0x80;
3126                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3127                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3128
3129                 memset(nskb->cb, 0, sizeof(nskb->cb));
3130
3131                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3132                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3133
3134                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3135                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3136                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3137                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3138                                 info->hw_queue =
3139                                         local->hw.offchannel_tx_hw_queue;
3140                 }
3141
3142                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3143                                             status->band);
3144         }
3145         dev_kfree_skb(rx->skb);
3146         return RX_QUEUED;
3147 }
3148
3149 static ieee80211_rx_result debug_noinline
3150 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3151 {
3152         struct ieee80211_sub_if_data *sdata = rx->sdata;
3153         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3154         __le16 stype;
3155
3156         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3157
3158         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3159             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3160             sdata->vif.type != NL80211_IFTYPE_OCB &&
3161             sdata->vif.type != NL80211_IFTYPE_STATION)
3162                 return RX_DROP_MONITOR;
3163
3164         switch (stype) {
3165         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3166         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3167         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3168                 /* process for all: mesh, mlme, ibss */
3169                 break;
3170         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3171         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3172         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3173         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3174                 if (is_multicast_ether_addr(mgmt->da) &&
3175                     !is_broadcast_ether_addr(mgmt->da))
3176                         return RX_DROP_MONITOR;
3177
3178                 /* process only for station */
3179                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3180                         return RX_DROP_MONITOR;
3181                 break;
3182         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3183                 /* process only for ibss and mesh */
3184                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3185                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3186                         return RX_DROP_MONITOR;
3187                 break;
3188         default:
3189                 return RX_DROP_MONITOR;
3190         }
3191
3192         /* queue up frame and kick off work to process it */
3193         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3194         skb_queue_tail(&sdata->skb_queue, rx->skb);
3195         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3196         if (rx->sta)
3197                 rx->sta->rx_stats.packets++;
3198
3199         return RX_QUEUED;
3200 }
3201
3202 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3203                                         struct ieee80211_rate *rate)
3204 {
3205         struct ieee80211_sub_if_data *sdata;
3206         struct ieee80211_local *local = rx->local;
3207         struct sk_buff *skb = rx->skb, *skb2;
3208         struct net_device *prev_dev = NULL;
3209         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3210         int needed_headroom;
3211
3212         /*
3213          * If cooked monitor has been processed already, then
3214          * don't do it again. If not, set the flag.
3215          */
3216         if (rx->flags & IEEE80211_RX_CMNTR)
3217                 goto out_free_skb;
3218         rx->flags |= IEEE80211_RX_CMNTR;
3219
3220         /* If there are no cooked monitor interfaces, just free the SKB */
3221         if (!local->cooked_mntrs)
3222                 goto out_free_skb;
3223
3224         /* vendor data is long removed here */
3225         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3226         /* room for the radiotap header based on driver features */
3227         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3228
3229         if (skb_headroom(skb) < needed_headroom &&
3230             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3231                 goto out_free_skb;
3232
3233         /* prepend radiotap information */
3234         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3235                                          false);
3236
3237         skb_reset_mac_header(skb);
3238         skb->ip_summed = CHECKSUM_UNNECESSARY;
3239         skb->pkt_type = PACKET_OTHERHOST;
3240         skb->protocol = htons(ETH_P_802_2);
3241
3242         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3243                 if (!ieee80211_sdata_running(sdata))
3244                         continue;
3245
3246                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3247                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3248                         continue;
3249
3250                 if (prev_dev) {
3251                         skb2 = skb_clone(skb, GFP_ATOMIC);
3252                         if (skb2) {
3253                                 skb2->dev = prev_dev;
3254                                 netif_receive_skb(skb2);
3255                         }
3256                 }
3257
3258                 prev_dev = sdata->dev;
3259                 ieee80211_rx_stats(sdata->dev, skb->len);
3260         }
3261
3262         if (prev_dev) {
3263                 skb->dev = prev_dev;
3264                 netif_receive_skb(skb);
3265                 return;
3266         }
3267
3268  out_free_skb:
3269         dev_kfree_skb(skb);
3270 }
3271
3272 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3273                                          ieee80211_rx_result res)
3274 {
3275         switch (res) {
3276         case RX_DROP_MONITOR:
3277                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3278                 if (rx->sta)
3279                         rx->sta->rx_stats.dropped++;
3280                 /* fall through */
3281         case RX_CONTINUE: {
3282                 struct ieee80211_rate *rate = NULL;
3283                 struct ieee80211_supported_band *sband;
3284                 struct ieee80211_rx_status *status;
3285
3286                 status = IEEE80211_SKB_RXCB((rx->skb));
3287
3288                 sband = rx->local->hw.wiphy->bands[status->band];
3289                 if (!(status->flag & RX_FLAG_HT) &&
3290                     !(status->flag & RX_FLAG_VHT))
3291                         rate = &sband->bitrates[status->rate_idx];
3292
3293                 ieee80211_rx_cooked_monitor(rx, rate);
3294                 break;
3295                 }
3296         case RX_DROP_UNUSABLE:
3297                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3298                 if (rx->sta)
3299                         rx->sta->rx_stats.dropped++;
3300                 dev_kfree_skb(rx->skb);
3301                 break;
3302         case RX_QUEUED:
3303                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3304                 break;
3305         }
3306 }
3307
3308 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3309                                   struct sk_buff_head *frames)
3310 {
3311         ieee80211_rx_result res = RX_DROP_MONITOR;
3312         struct sk_buff *skb;
3313
3314 #define CALL_RXH(rxh)                   \
3315         do {                            \
3316                 res = rxh(rx);          \
3317                 if (res != RX_CONTINUE) \
3318                         goto rxh_next;  \
3319         } while (0)
3320
3321         /* Lock here to avoid hitting all of the data used in the RX
3322          * path (e.g. key data, station data, ...) concurrently when
3323          * a frame is released from the reorder buffer due to timeout
3324          * from the timer, potentially concurrently with RX from the
3325          * driver.
3326          */
3327         spin_lock_bh(&rx->local->rx_path_lock);
3328
3329         while ((skb = __skb_dequeue(frames))) {
3330                 /*
3331                  * all the other fields are valid across frames
3332                  * that belong to an aMPDU since they are on the
3333                  * same TID from the same station
3334                  */
3335                 rx->skb = skb;
3336
3337                 CALL_RXH(ieee80211_rx_h_check_more_data);
3338                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3339                 CALL_RXH(ieee80211_rx_h_sta_process);
3340                 CALL_RXH(ieee80211_rx_h_decrypt);
3341                 CALL_RXH(ieee80211_rx_h_defragment);
3342                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3343                 /* must be after MMIC verify so header is counted in MPDU mic */
3344 #ifdef CONFIG_MAC80211_MESH
3345                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3346                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3347 #endif
3348                 CALL_RXH(ieee80211_rx_h_amsdu);
3349                 CALL_RXH(ieee80211_rx_h_data);
3350
3351                 /* special treatment -- needs the queue */
3352                 res = ieee80211_rx_h_ctrl(rx, frames);
3353                 if (res != RX_CONTINUE)
3354                         goto rxh_next;
3355
3356                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3357                 CALL_RXH(ieee80211_rx_h_action);
3358                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3359                 CALL_RXH(ieee80211_rx_h_action_return);
3360                 CALL_RXH(ieee80211_rx_h_mgmt);
3361
3362  rxh_next:
3363                 ieee80211_rx_handlers_result(rx, res);
3364
3365 #undef CALL_RXH
3366         }
3367
3368         spin_unlock_bh(&rx->local->rx_path_lock);
3369 }
3370
3371 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3372 {
3373         struct sk_buff_head reorder_release;
3374         ieee80211_rx_result res = RX_DROP_MONITOR;
3375
3376         __skb_queue_head_init(&reorder_release);
3377
3378 #define CALL_RXH(rxh)                   \
3379         do {                            \
3380                 res = rxh(rx);          \
3381                 if (res != RX_CONTINUE) \
3382                         goto rxh_next;  \
3383         } while (0)
3384
3385         CALL_RXH(ieee80211_rx_h_check_dup);
3386         CALL_RXH(ieee80211_rx_h_check);
3387
3388         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3389
3390         ieee80211_rx_handlers(rx, &reorder_release);
3391         return;
3392
3393  rxh_next:
3394         ieee80211_rx_handlers_result(rx, res);
3395
3396 #undef CALL_RXH
3397 }
3398
3399 /*
3400  * This function makes calls into the RX path, therefore
3401  * it has to be invoked under RCU read lock.
3402  */
3403 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3404 {
3405         struct sk_buff_head frames;
3406         struct ieee80211_rx_data rx = {
3407                 .sta = sta,
3408                 .sdata = sta->sdata,
3409                 .local = sta->local,
3410                 /* This is OK -- must be QoS data frame */
3411                 .security_idx = tid,
3412                 .seqno_idx = tid,
3413                 .napi = NULL, /* must be NULL to not have races */
3414         };
3415         struct tid_ampdu_rx *tid_agg_rx;
3416
3417         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3418         if (!tid_agg_rx)
3419                 return;
3420
3421         __skb_queue_head_init(&frames);
3422
3423         spin_lock(&tid_agg_rx->reorder_lock);
3424         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3425         spin_unlock(&tid_agg_rx->reorder_lock);
3426
3427         if (!skb_queue_empty(&frames)) {
3428                 struct ieee80211_event event = {
3429                         .type = BA_FRAME_TIMEOUT,
3430                         .u.ba.tid = tid,
3431                         .u.ba.sta = &sta->sta,
3432                 };
3433                 drv_event_callback(rx.local, rx.sdata, &event);
3434         }
3435
3436         ieee80211_rx_handlers(&rx, &frames);
3437 }
3438
3439 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3440                                           u16 ssn, u64 filtered,
3441                                           u16 received_mpdus)
3442 {
3443         struct sta_info *sta;
3444         struct tid_ampdu_rx *tid_agg_rx;
3445         struct sk_buff_head frames;
3446         struct ieee80211_rx_data rx = {
3447                 /* This is OK -- must be QoS data frame */
3448                 .security_idx = tid,
3449                 .seqno_idx = tid,
3450         };
3451         int i, diff;
3452
3453         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3454                 return;
3455
3456         __skb_queue_head_init(&frames);
3457
3458         sta = container_of(pubsta, struct sta_info, sta);
3459
3460         rx.sta = sta;
3461         rx.sdata = sta->sdata;
3462         rx.local = sta->local;
3463
3464         rcu_read_lock();
3465         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3466         if (!tid_agg_rx)
3467                 goto out;
3468
3469         spin_lock_bh(&tid_agg_rx->reorder_lock);
3470
3471         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3472                 int release;
3473
3474                 /* release all frames in the reorder buffer */
3475                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3476                            IEEE80211_SN_MODULO;
3477                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3478                                                  release, &frames);
3479                 /* update ssn to match received ssn */
3480                 tid_agg_rx->head_seq_num = ssn;
3481         } else {
3482                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3483                                                  &frames);
3484         }
3485
3486         /* handle the case that received ssn is behind the mac ssn.
3487          * it can be tid_agg_rx->buf_size behind and still be valid */
3488         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3489         if (diff >= tid_agg_rx->buf_size) {
3490                 tid_agg_rx->reorder_buf_filtered = 0;
3491                 goto release;
3492         }
3493         filtered = filtered >> diff;
3494         ssn += diff;
3495
3496         /* update bitmap */
3497         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3498                 int index = (ssn + i) % tid_agg_rx->buf_size;
3499
3500                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3501                 if (filtered & BIT_ULL(i))
3502                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3503         }
3504
3505         /* now process also frames that the filter marking released */
3506         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3507
3508 release:
3509         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3510
3511         ieee80211_rx_handlers(&rx, &frames);
3512
3513  out:
3514         rcu_read_unlock();
3515 }
3516 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3517
3518 /* main receive path */
3519
3520 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3521 {
3522         struct ieee80211_sub_if_data *sdata = rx->sdata;
3523         struct sk_buff *skb = rx->skb;
3524         struct ieee80211_hdr *hdr = (void *)skb->data;
3525         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3526         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3527         int multicast = is_multicast_ether_addr(hdr->addr1);
3528
3529         switch (sdata->vif.type) {
3530         case NL80211_IFTYPE_STATION:
3531                 if (!bssid && !sdata->u.mgd.use_4addr)
3532                         return false;
3533                 if (multicast)
3534                         return true;
3535                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3536         case NL80211_IFTYPE_ADHOC:
3537                 if (!bssid)
3538                         return false;
3539                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3540                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3541                         return false;
3542                 if (ieee80211_is_beacon(hdr->frame_control))
3543                         return true;
3544                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3545                         return false;
3546                 if (!multicast &&
3547                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3548                         return false;
3549                 if (!rx->sta) {
3550                         int rate_idx;
3551                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3552                                 rate_idx = 0; /* TODO: HT/VHT rates */
3553                         else
3554                                 rate_idx = status->rate_idx;
3555                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3556                                                  BIT(rate_idx));
3557                 }
3558                 return true;
3559         case NL80211_IFTYPE_OCB:
3560                 if (!bssid)
3561                         return false;
3562                 if (!ieee80211_is_data_present(hdr->frame_control))
3563                         return false;
3564                 if (!is_broadcast_ether_addr(bssid))
3565                         return false;
3566                 if (!multicast &&
3567                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3568                         return false;
3569                 if (!rx->sta) {
3570                         int rate_idx;
3571                         if (status->flag & RX_FLAG_HT)
3572                                 rate_idx = 0; /* TODO: HT rates */
3573                         else
3574                                 rate_idx = status->rate_idx;
3575                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3576                                                 BIT(rate_idx));
3577                 }
3578                 return true;
3579         case NL80211_IFTYPE_MESH_POINT:
3580                 if (multicast)
3581                         return true;
3582                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3583         case NL80211_IFTYPE_AP_VLAN:
3584         case NL80211_IFTYPE_AP:
3585                 if (!bssid)
3586                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3587
3588                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3589                         /*
3590                          * Accept public action frames even when the
3591                          * BSSID doesn't match, this is used for P2P
3592                          * and location updates. Note that mac80211
3593                          * itself never looks at these frames.
3594                          */
3595                         if (!multicast &&
3596                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3597                                 return false;
3598                         if (ieee80211_is_public_action(hdr, skb->len))
3599                                 return true;
3600                         return ieee80211_is_beacon(hdr->frame_control);
3601                 }
3602
3603                 if (!ieee80211_has_tods(hdr->frame_control)) {
3604                         /* ignore data frames to TDLS-peers */
3605                         if (ieee80211_is_data(hdr->frame_control))
3606                                 return false;
3607                         /* ignore action frames to TDLS-peers */
3608                         if (ieee80211_is_action(hdr->frame_control) &&
3609                             !is_broadcast_ether_addr(bssid) &&
3610                             !ether_addr_equal(bssid, hdr->addr1))
3611                                 return false;
3612                 }
3613                 return true;
3614         case NL80211_IFTYPE_WDS:
3615                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3616                         return false;
3617                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3618         case NL80211_IFTYPE_P2P_DEVICE:
3619                 return ieee80211_is_public_action(hdr, skb->len) ||
3620                        ieee80211_is_probe_req(hdr->frame_control) ||
3621                        ieee80211_is_probe_resp(hdr->frame_control) ||
3622                        ieee80211_is_beacon(hdr->frame_control);
3623         case NL80211_IFTYPE_NAN:
3624                 /* Currently no frames on NAN interface are allowed */
3625                 return false;
3626         default:
3627                 break;
3628         }
3629
3630         WARN_ON_ONCE(1);
3631         return false;
3632 }
3633
3634 void ieee80211_check_fast_rx(struct sta_info *sta)
3635 {
3636         struct ieee80211_sub_if_data *sdata = sta->sdata;
3637         struct ieee80211_local *local = sdata->local;
3638         struct ieee80211_key *key;
3639         struct ieee80211_fast_rx fastrx = {
3640                 .dev = sdata->dev,
3641                 .vif_type = sdata->vif.type,
3642                 .control_port_protocol = sdata->control_port_protocol,
3643         }, *old, *new = NULL;
3644         bool assign = false;
3645
3646         /* use sparse to check that we don't return without updating */
3647         __acquire(check_fast_rx);
3648
3649         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3650         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3651         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3652         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3653
3654         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3655
3656         /* fast-rx doesn't do reordering */
3657         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3658             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3659                 goto clear;
3660
3661         switch (sdata->vif.type) {
3662         case NL80211_IFTYPE_STATION:
3663                 /* 4-addr is harder to deal with, later maybe */
3664                 if (sdata->u.mgd.use_4addr)
3665                         goto clear;
3666                 /* software powersave is a huge mess, avoid all of it */
3667                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3668                         goto clear;
3669                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3670                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3671                         goto clear;
3672                 if (sta->sta.tdls) {
3673                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3674                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3675                         fastrx.expected_ds_bits = 0;
3676                 } else {
3677                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3678                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3679                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3680                         fastrx.expected_ds_bits =
3681                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3682                 }
3683                 break;
3684         case NL80211_IFTYPE_AP_VLAN:
3685         case NL80211_IFTYPE_AP:
3686                 /* parallel-rx requires this, at least with calls to
3687                  * ieee80211_sta_ps_transition()
3688                  */
3689                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3690                         goto clear;
3691                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3692                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3693                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3694
3695                 fastrx.internal_forward =
3696                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3697                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3698                          !sdata->u.vlan.sta);
3699                 break;
3700         default:
3701                 goto clear;
3702         }
3703
3704         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3705                 goto clear;
3706
3707         rcu_read_lock();
3708         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3709         if (key) {
3710                 switch (key->conf.cipher) {
3711                 case WLAN_CIPHER_SUITE_TKIP:
3712                         /* we don't want to deal with MMIC in fast-rx */
3713                         goto clear_rcu;
3714                 case WLAN_CIPHER_SUITE_CCMP:
3715                 case WLAN_CIPHER_SUITE_CCMP_256:
3716                 case WLAN_CIPHER_SUITE_GCMP:
3717                 case WLAN_CIPHER_SUITE_GCMP_256:
3718                         break;
3719                 default:
3720                         /* we also don't want to deal with WEP or cipher scheme
3721                          * since those require looking up the key idx in the
3722                          * frame, rather than assuming the PTK is used
3723                          * (we need to revisit this once we implement the real
3724                          * PTK index, which is now valid in the spec, but we
3725                          * haven't implemented that part yet)
3726                          */
3727                         goto clear_rcu;
3728                 }
3729
3730                 fastrx.key = true;
3731                 fastrx.icv_len = key->conf.icv_len;
3732         }
3733
3734         assign = true;
3735  clear_rcu:
3736         rcu_read_unlock();
3737  clear:
3738         __release(check_fast_rx);
3739
3740         if (assign)
3741                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3742
3743         spin_lock_bh(&sta->lock);
3744         old = rcu_dereference_protected(sta->fast_rx, true);
3745         rcu_assign_pointer(sta->fast_rx, new);
3746         spin_unlock_bh(&sta->lock);
3747
3748         if (old)
3749                 kfree_rcu(old, rcu_head);
3750 }
3751
3752 void ieee80211_clear_fast_rx(struct sta_info *sta)
3753 {
3754         struct ieee80211_fast_rx *old;
3755
3756         spin_lock_bh(&sta->lock);
3757         old = rcu_dereference_protected(sta->fast_rx, true);
3758         RCU_INIT_POINTER(sta->fast_rx, NULL);
3759         spin_unlock_bh(&sta->lock);
3760
3761         if (old)
3762                 kfree_rcu(old, rcu_head);
3763 }
3764
3765 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3766 {
3767         struct ieee80211_local *local = sdata->local;
3768         struct sta_info *sta;
3769
3770         lockdep_assert_held(&local->sta_mtx);
3771
3772         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3773                 if (sdata != sta->sdata &&
3774                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3775                         continue;
3776                 ieee80211_check_fast_rx(sta);
3777         }
3778 }
3779
3780 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3781 {
3782         struct ieee80211_local *local = sdata->local;
3783
3784         mutex_lock(&local->sta_mtx);
3785         __ieee80211_check_fast_rx_iface(sdata);
3786         mutex_unlock(&local->sta_mtx);
3787 }
3788
3789 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3790                                      struct ieee80211_fast_rx *fast_rx)
3791 {
3792         struct sk_buff *skb = rx->skb;
3793         struct ieee80211_hdr *hdr = (void *)skb->data;
3794         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3795         struct sta_info *sta = rx->sta;
3796         int orig_len = skb->len;
3797         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3798         struct {
3799                 u8 snap[sizeof(rfc1042_header)];
3800                 __be16 proto;
3801         } *payload __aligned(2);
3802         struct {
3803                 u8 da[ETH_ALEN];
3804                 u8 sa[ETH_ALEN];
3805         } addrs __aligned(2);
3806         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3807
3808         if (fast_rx->uses_rss)
3809                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3810
3811         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3812          * to a common data structure; drivers can implement that per queue
3813          * but we don't have that information in mac80211
3814          */
3815         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3816                 return false;
3817
3818 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3819
3820         /* If using encryption, we also need to have:
3821          *  - PN_VALIDATED: similar, but the implementation is tricky
3822          *  - DECRYPTED: necessary for PN_VALIDATED
3823          */
3824         if (fast_rx->key &&
3825             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3826                 return false;
3827
3828         /* we don't deal with A-MSDU deaggregation here */
3829         if (status->rx_flags & IEEE80211_RX_AMSDU)
3830                 return false;
3831
3832         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3833                 return false;
3834
3835         if (unlikely(ieee80211_is_frag(hdr)))
3836                 return false;
3837
3838         /* Since our interface address cannot be multicast, this
3839          * implicitly also rejects multicast frames without the
3840          * explicit check.
3841          *
3842          * We shouldn't get any *data* frames not addressed to us
3843          * (AP mode will accept multicast *management* frames), but
3844          * punting here will make it go through the full checks in
3845          * ieee80211_accept_frame().
3846          */
3847         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3848                 return false;
3849
3850         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3851                                               IEEE80211_FCTL_TODS)) !=
3852             fast_rx->expected_ds_bits)
3853                 goto drop;
3854
3855         /* assign the key to drop unencrypted frames (later)
3856          * and strip the IV/MIC if necessary
3857          */
3858         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3859                 /* GCMP header length is the same */
3860                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3861         }
3862
3863         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3864                 goto drop;
3865         payload = (void *)(skb->data + snap_offs);
3866
3867         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3868                 return false;
3869
3870         /* Don't handle these here since they require special code.
3871          * Accept AARP and IPX even though they should come with a
3872          * bridge-tunnel header - but if we get them this way then
3873          * there's little point in discarding them.
3874          */
3875         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3876                      payload->proto == fast_rx->control_port_protocol))
3877                 return false;
3878
3879         /* after this point, don't punt to the slowpath! */
3880
3881         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3882             pskb_trim(skb, skb->len - fast_rx->icv_len))
3883                 goto drop;
3884
3885         if (unlikely(fast_rx->sta_notify)) {
3886                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3887                 fast_rx->sta_notify = false;
3888         }
3889
3890         /* statistics part of ieee80211_rx_h_sta_process() */
3891         stats->last_rx = jiffies;
3892         stats->last_rate = sta_stats_encode_rate(status);
3893
3894         stats->fragments++;
3895         stats->packets++;
3896
3897         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3898                 stats->last_signal = status->signal;
3899                 if (!fast_rx->uses_rss)
3900                         ewma_signal_add(&sta->rx_stats_avg.signal,
3901                                         -status->signal);
3902         }
3903
3904         if (status->chains) {
3905                 int i;
3906
3907                 stats->chains = status->chains;
3908                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3909                         int signal = status->chain_signal[i];
3910
3911                         if (!(status->chains & BIT(i)))
3912                                 continue;
3913
3914                         stats->chain_signal_last[i] = signal;
3915                         if (!fast_rx->uses_rss)
3916                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3917                                                 -signal);
3918                 }
3919         }
3920         /* end of statistics */
3921
3922         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3923                 goto drop;
3924
3925         /* do the header conversion - first grab the addresses */
3926         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3927         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3928         /* remove the SNAP but leave the ethertype */
3929         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3930         /* push the addresses in front */
3931         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3932
3933         skb->dev = fast_rx->dev;
3934
3935         ieee80211_rx_stats(fast_rx->dev, skb->len);
3936
3937         /* The seqno index has the same property as needed
3938          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3939          * for non-QoS-data frames. Here we know it's a data
3940          * frame, so count MSDUs.
3941          */
3942         u64_stats_update_begin(&stats->syncp);
3943         stats->msdu[rx->seqno_idx]++;
3944         stats->bytes += orig_len;
3945         u64_stats_update_end(&stats->syncp);
3946
3947         if (fast_rx->internal_forward) {
3948                 struct sk_buff *xmit_skb = NULL;
3949                 bool multicast = is_multicast_ether_addr(skb->data);
3950
3951                 if (multicast) {
3952                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
3953                 } else if (sta_info_get(rx->sdata, skb->data)) {
3954                         xmit_skb = skb;
3955                         skb = NULL;
3956                 }
3957
3958                 if (xmit_skb) {
3959                         /*
3960                          * Send to wireless media and increase priority by 256
3961                          * to keep the received priority instead of
3962                          * reclassifying the frame (see cfg80211_classify8021d).
3963                          */
3964                         xmit_skb->priority += 256;
3965                         xmit_skb->protocol = htons(ETH_P_802_3);
3966                         skb_reset_network_header(xmit_skb);
3967                         skb_reset_mac_header(xmit_skb);
3968                         dev_queue_xmit(xmit_skb);
3969                 }
3970
3971                 if (!skb)
3972                         return true;
3973         }
3974
3975         /* deliver to local stack */
3976         skb->protocol = eth_type_trans(skb, fast_rx->dev);
3977         memset(skb->cb, 0, sizeof(skb->cb));
3978         if (rx->napi)
3979                 napi_gro_receive(rx->napi, skb);
3980         else
3981                 netif_receive_skb(skb);
3982
3983         return true;
3984  drop:
3985         dev_kfree_skb(skb);
3986         stats->dropped++;
3987         return true;
3988 }
3989
3990 /*
3991  * This function returns whether or not the SKB
3992  * was destined for RX processing or not, which,
3993  * if consume is true, is equivalent to whether
3994  * or not the skb was consumed.
3995  */
3996 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3997                                             struct sk_buff *skb, bool consume)
3998 {
3999         struct ieee80211_local *local = rx->local;
4000         struct ieee80211_sub_if_data *sdata = rx->sdata;
4001
4002         rx->skb = skb;
4003
4004         /* See if we can do fast-rx; if we have to copy we already lost,
4005          * so punt in that case. We should never have to deliver a data
4006          * frame to multiple interfaces anyway.
4007          *
4008          * We skip the ieee80211_accept_frame() call and do the necessary
4009          * checking inside ieee80211_invoke_fast_rx().
4010          */
4011         if (consume && rx->sta) {
4012                 struct ieee80211_fast_rx *fast_rx;
4013
4014                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4015                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4016                         return true;
4017         }
4018
4019         if (!ieee80211_accept_frame(rx))
4020                 return false;
4021
4022         if (!consume) {
4023                 skb = skb_copy(skb, GFP_ATOMIC);
4024                 if (!skb) {
4025                         if (net_ratelimit())
4026                                 wiphy_debug(local->hw.wiphy,
4027                                         "failed to copy skb for %s\n",
4028                                         sdata->name);
4029                         return true;
4030                 }
4031
4032                 rx->skb = skb;
4033         }
4034
4035         ieee80211_invoke_rx_handlers(rx);
4036         return true;
4037 }
4038
4039 /*
4040  * This is the actual Rx frames handler. as it belongs to Rx path it must
4041  * be called with rcu_read_lock protection.
4042  */
4043 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4044                                          struct ieee80211_sta *pubsta,
4045                                          struct sk_buff *skb,
4046                                          struct napi_struct *napi)
4047 {
4048         struct ieee80211_local *local = hw_to_local(hw);
4049         struct ieee80211_sub_if_data *sdata;
4050         struct ieee80211_hdr *hdr;
4051         __le16 fc;
4052         struct ieee80211_rx_data rx;
4053         struct ieee80211_sub_if_data *prev;
4054         struct rhlist_head *tmp;
4055         int err = 0;
4056
4057         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4058         memset(&rx, 0, sizeof(rx));
4059         rx.skb = skb;
4060         rx.local = local;
4061         rx.napi = napi;
4062
4063         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4064                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4065
4066         if (ieee80211_is_mgmt(fc)) {
4067                 /* drop frame if too short for header */
4068                 if (skb->len < ieee80211_hdrlen(fc))
4069                         err = -ENOBUFS;
4070                 else
4071                         err = skb_linearize(skb);
4072         } else {
4073                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4074         }
4075
4076         if (err) {
4077                 dev_kfree_skb(skb);
4078                 return;
4079         }
4080
4081         hdr = (struct ieee80211_hdr *)skb->data;
4082         ieee80211_parse_qos(&rx);
4083         ieee80211_verify_alignment(&rx);
4084
4085         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4086                      ieee80211_is_beacon(hdr->frame_control)))
4087                 ieee80211_scan_rx(local, skb);
4088
4089         if (ieee80211_is_data(fc)) {
4090                 struct sta_info *sta, *prev_sta;
4091
4092                 if (pubsta) {
4093                         rx.sta = container_of(pubsta, struct sta_info, sta);
4094                         rx.sdata = rx.sta->sdata;
4095                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4096                                 return;
4097                         goto out;
4098                 }
4099
4100                 prev_sta = NULL;
4101
4102                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4103                         if (!prev_sta) {
4104                                 prev_sta = sta;
4105                                 continue;
4106                         }
4107
4108                         rx.sta = prev_sta;
4109                         rx.sdata = prev_sta->sdata;
4110                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4111
4112                         prev_sta = sta;
4113                 }
4114
4115                 if (prev_sta) {
4116                         rx.sta = prev_sta;
4117                         rx.sdata = prev_sta->sdata;
4118
4119                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4120                                 return;
4121                         goto out;
4122                 }
4123         }
4124
4125         prev = NULL;
4126
4127         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4128                 if (!ieee80211_sdata_running(sdata))
4129                         continue;
4130
4131                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4132                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4133                         continue;
4134
4135                 /*
4136                  * frame is destined for this interface, but if it's
4137                  * not also for the previous one we handle that after
4138                  * the loop to avoid copying the SKB once too much
4139                  */
4140
4141                 if (!prev) {
4142                         prev = sdata;
4143                         continue;
4144                 }
4145
4146                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4147                 rx.sdata = prev;
4148                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4149
4150                 prev = sdata;
4151         }
4152
4153         if (prev) {
4154                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4155                 rx.sdata = prev;
4156
4157                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4158                         return;
4159         }
4160
4161  out:
4162         dev_kfree_skb(skb);
4163 }
4164
4165 /*
4166  * This is the receive path handler. It is called by a low level driver when an
4167  * 802.11 MPDU is received from the hardware.
4168  */
4169 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4170                        struct sk_buff *skb, struct napi_struct *napi)
4171 {
4172         struct ieee80211_local *local = hw_to_local(hw);
4173         struct ieee80211_rate *rate = NULL;
4174         struct ieee80211_supported_band *sband;
4175         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4176
4177         WARN_ON_ONCE(softirq_count() == 0);
4178
4179         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4180                 goto drop;
4181
4182         sband = local->hw.wiphy->bands[status->band];
4183         if (WARN_ON(!sband))
4184                 goto drop;
4185
4186         /*
4187          * If we're suspending, it is possible although not too likely
4188          * that we'd be receiving frames after having already partially
4189          * quiesced the stack. We can't process such frames then since
4190          * that might, for example, cause stations to be added or other
4191          * driver callbacks be invoked.
4192          */
4193         if (unlikely(local->quiescing || local->suspended))
4194                 goto drop;
4195
4196         /* We might be during a HW reconfig, prevent Rx for the same reason */
4197         if (unlikely(local->in_reconfig))
4198                 goto drop;
4199
4200         /*
4201          * The same happens when we're not even started,
4202          * but that's worth a warning.
4203          */
4204         if (WARN_ON(!local->started))
4205                 goto drop;
4206
4207         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4208                 /*
4209                  * Validate the rate, unless a PLCP error means that
4210                  * we probably can't have a valid rate here anyway.
4211                  */
4212
4213                 if (status->flag & RX_FLAG_HT) {
4214                         /*
4215                          * rate_idx is MCS index, which can be [0-76]
4216                          * as documented on:
4217                          *
4218                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4219                          *
4220                          * Anything else would be some sort of driver or
4221                          * hardware error. The driver should catch hardware
4222                          * errors.
4223                          */
4224                         if (WARN(status->rate_idx > 76,
4225                                  "Rate marked as an HT rate but passed "
4226                                  "status->rate_idx is not "
4227                                  "an MCS index [0-76]: %d (0x%02x)\n",
4228                                  status->rate_idx,
4229                                  status->rate_idx))
4230                                 goto drop;
4231                 } else if (status->flag & RX_FLAG_VHT) {
4232                         if (WARN_ONCE(status->rate_idx > 9 ||
4233                                       !status->vht_nss ||
4234                                       status->vht_nss > 8,
4235                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4236                                       status->rate_idx, status->vht_nss))
4237                                 goto drop;
4238                 } else {
4239                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4240                                 goto drop;
4241                         rate = &sband->bitrates[status->rate_idx];
4242                 }
4243         }
4244
4245         status->rx_flags = 0;
4246
4247         /*
4248          * key references and virtual interfaces are protected using RCU
4249          * and this requires that we are in a read-side RCU section during
4250          * receive processing
4251          */
4252         rcu_read_lock();
4253
4254         /*
4255          * Frames with failed FCS/PLCP checksum are not returned,
4256          * all other frames are returned without radiotap header
4257          * if it was previously present.
4258          * Also, frames with less than 16 bytes are dropped.
4259          */
4260         skb = ieee80211_rx_monitor(local, skb, rate);
4261         if (!skb) {
4262                 rcu_read_unlock();
4263                 return;
4264         }
4265
4266         ieee80211_tpt_led_trig_rx(local,
4267                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4268                         skb->len);
4269
4270         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4271
4272         rcu_read_unlock();
4273
4274         return;
4275  drop:
4276         kfree_skb(skb);
4277 }
4278 EXPORT_SYMBOL(ieee80211_rx_napi);
4279
4280 /* This is a version of the rx handler that can be called from hard irq
4281  * context. Post the skb on the queue and schedule the tasklet */
4282 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4283 {
4284         struct ieee80211_local *local = hw_to_local(hw);
4285
4286         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4287
4288         skb->pkt_type = IEEE80211_RX_MSG;
4289         skb_queue_tail(&local->skb_queue, skb);
4290         tasklet_schedule(&local->tasklet);
4291 }
4292 EXPORT_SYMBOL(ieee80211_rx_irqsafe);