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 void remove_monitor_info(struct sk_buff *skb,
  99                                 unsigned int present_fcs_len,
 100                                 unsigned int rtap_vendor_space)
 101 {
 102         if (present_fcs_len)
 103                 __pskb_trim(skb, skb->len - present_fcs_len);
 104         __pskb_pull(skb, rtap_vendor_space);
 105 }
 106
 107 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 108                                      unsigned int rtap_vendor_space)
 109 {
 110         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 111         struct ieee80211_hdr *hdr;
 112
 113         hdr = (void *)(skb->data + rtap_vendor_space);
 114
 115         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 116                             RX_FLAG_FAILED_PLCP_CRC |
 117                             RX_FLAG_ONLY_MONITOR))
 118                 return true;
 119
 120         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 121                 return true;
 122
 123         if (ieee80211_is_ctl(hdr->frame_control) &&
 124             !ieee80211_is_pspoll(hdr->frame_control) &&
 125             !ieee80211_is_back_req(hdr->frame_control))
 126                 return true;
 127
 128         return false;
 129 }
 130
 131 static int
 132 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 133                              struct ieee80211_rx_status *status,
 134                              struct sk_buff *skb)
 135 {
 136         int len;
 137
 138         /* always present fields */
 139         len = sizeof(struct ieee80211_radiotap_header) + 8;
 140
 141         /* allocate extra bitmaps */
 142         if (status->chains)
 143                 len += 4 * hweight8(status->chains);
 144
 145         if (ieee80211_have_rx_timestamp(status)) {
 146                 len = ALIGN(len, 8);
 147                 len += 8;
 148         }
 149         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 150                 len += 1;
 151
 152         /* antenna field, if we don't have per-chain info */
 153         if (!status->chains)
 154                 len += 1;
 155
 156         /* padding for RX_FLAGS if necessary */
 157         len = ALIGN(len, 2);
 158
 159         if (status->flag & RX_FLAG_HT) /* HT info */
 160                 len += 3;
 161
 162         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 163                 len = ALIGN(len, 4);
 164                 len += 8;
 165         }
 166
 167         if (status->flag & RX_FLAG_VHT) {
 168                 len = ALIGN(len, 2);
 169                 len += 12;
 170         }
 171
 172         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 173                 len = ALIGN(len, 8);
 174                 len += 12;
 175         }
 176
 177         if (status->chains) {
 178                 /* antenna and antenna signal fields */
 179                 len += 2 * hweight8(status->chains);
 180         }
 181
 182         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 183                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 184
 185                 /* vendor presence bitmap */
 186                 len += 4;
 187                 /* alignment for fixed 6-byte vendor data header */
 188                 len = ALIGN(len, 2);
 189                 /* vendor data header */
 190                 len += 6;
 191                 if (WARN_ON(rtap->align == 0))
 192                         rtap->align = 1;
 193                 len = ALIGN(len, rtap->align);
 194                 len += rtap->len + rtap->pad;
 195         }
 196
 197         return len;
 198 }
 199
 200 /*
 201  * ieee80211_add_rx_radiotap_header - add radiotap header
 202  *
 203  * add a radiotap header containing all the fields which the hardware provided.
 204  */
 205 static void
 206 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 207                                  struct sk_buff *skb,
 208                                  struct ieee80211_rate *rate,
 209                                  int rtap_len, bool has_fcs)
 210 {
 211         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 212         struct ieee80211_radiotap_header *rthdr;
 213         unsigned char *pos;
 214         __le32 *it_present;
 215         u32 it_present_val;
 216         u16 rx_flags = 0;
 217         u16 channel_flags = 0;
 218         int mpdulen, chain;
 219         unsigned long chains = status->chains;
 220         struct ieee80211_vendor_radiotap rtap = {};
 221
 222         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 223                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 224                 /* rtap.len and rtap.pad are undone immediately */
 225                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 226         }
 227
 228         mpdulen = skb->len;
 229         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 230                 mpdulen += FCS_LEN;
 231
 232         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 233         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 234         it_present = &rthdr->it_present;
 235
 236         /* radiotap header, set always present flags */
 237         rthdr->it_len = cpu_to_le16(rtap_len);
 238         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 239                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 240                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 241
 242         if (!status->chains)
 243                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 244
 245         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 246                 it_present_val |=
 247                         BIT(IEEE80211_RADIOTAP_EXT) |
 248                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 249                 put_unaligned_le32(it_present_val, it_present);
 250                 it_present++;
 251                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 252                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 253         }
 254
 255         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 256                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 257                                   BIT(IEEE80211_RADIOTAP_EXT);
 258                 put_unaligned_le32(it_present_val, it_present);
 259                 it_present++;
 260                 it_present_val = rtap.present;
 261         }
 262
 263         put_unaligned_le32(it_present_val, it_present);
 264
 265         pos = (void *)(it_present + 1);
 266
 267         /* the order of the following fields is important */
 268
 269         /* IEEE80211_RADIOTAP_TSFT */
 270         if (ieee80211_have_rx_timestamp(status)) {
 271                 /* padding */
 272                 while ((pos - (u8 *)rthdr) & 7)
 273                         *pos++ = 0;
 274                 put_unaligned_le64(
 275                         ieee80211_calculate_rx_timestamp(local, status,
 276                                                          mpdulen, 0),
 277                         pos);
 278                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 279                 pos += 8;
 280         }
 281
 282         /* IEEE80211_RADIOTAP_FLAGS */
 283         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 284                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 285         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 286                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 287         if (status->flag & RX_FLAG_SHORTPRE)
 288                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 289         pos++;
 290
 291         /* IEEE80211_RADIOTAP_RATE */
 292         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 293                 /*
 294                  * Without rate information don't add it. If we have,
 295                  * MCS information is a separate field in radiotap,
 296                  * added below. The byte here is needed as padding
 297                  * for the channel though, so initialise it to 0.
 298                  */
 299                 *pos = 0;
 300         } else {
 301                 int shift = 0;
 302                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 303                 if (status->flag & RX_FLAG_10MHZ)
 304                         shift = 1;
 305                 else if (status->flag & RX_FLAG_5MHZ)
 306                         shift = 2;
 307                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 308         }
 309         pos++;
 310
 311         /* IEEE80211_RADIOTAP_CHANNEL */
 312         put_unaligned_le16(status->freq, pos);
 313         pos += 2;
 314         if (status->flag & RX_FLAG_10MHZ)
 315                 channel_flags |= IEEE80211_CHAN_HALF;
 316         else if (status->flag & RX_FLAG_5MHZ)
 317                 channel_flags |= IEEE80211_CHAN_QUARTER;
 318
 319         if (status->band == NL80211_BAND_5GHZ)
 320                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 321         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 322                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 323         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 324                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 325         else if (rate)
 326                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 327         else
 328                 channel_flags |= IEEE80211_CHAN_2GHZ;
 329         put_unaligned_le16(channel_flags, pos);
 330         pos += 2;
 331
 332         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 333         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 334             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 335                 *pos = status->signal;
 336                 rthdr->it_present |=
 337                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 338                 pos++;
 339         }
 340
 341         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 342
 343         if (!status->chains) {
 344                 /* IEEE80211_RADIOTAP_ANTENNA */
 345                 *pos = status->antenna;
 346                 pos++;
 347         }
 348
 349         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 350
 351         /* IEEE80211_RADIOTAP_RX_FLAGS */
 352         /* ensure 2 byte alignment for the 2 byte field as required */
 353         if ((pos - (u8 *)rthdr) & 1)
 354                 *pos++ = 0;
 355         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 356                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 357         put_unaligned_le16(rx_flags, pos);
 358         pos += 2;
 359
 360         if (status->flag & RX_FLAG_HT) {
 361                 unsigned int stbc;
 362
 363                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 364                 *pos++ = local->hw.radiotap_mcs_details;
 365                 *pos = 0;
 366                 if (status->flag & RX_FLAG_SHORT_GI)
 367                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 368                 if (status->flag & RX_FLAG_40MHZ)
 369                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 370                 if (status->flag & RX_FLAG_HT_GF)
 371                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 372                 if (status->flag & RX_FLAG_LDPC)
 373                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 374                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 375                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 376                 pos++;
 377                 *pos++ = status->rate_idx;
 378         }
 379
 380         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 381                 u16 flags = 0;
 382
 383                 /* ensure 4 byte alignment */
 384                 while ((pos - (u8 *)rthdr) & 3)
 385                         pos++;
 386                 rthdr->it_present |=
 387                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 388                 put_unaligned_le32(status->ampdu_reference, pos);
 389                 pos += 4;
 390                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 391                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 392                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 393                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 394                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 395                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 396                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 397                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 398                 put_unaligned_le16(flags, pos);
 399                 pos += 2;
 400                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 401                         *pos++ = status->ampdu_delimiter_crc;
 402                 else
 403                         *pos++ = 0;
 404                 *pos++ = 0;
 405         }
 406
 407         if (status->flag & RX_FLAG_VHT) {
 408                 u16 known = local->hw.radiotap_vht_details;
 409
 410                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 411                 put_unaligned_le16(known, pos);
 412                 pos += 2;
 413                 /* flags */
 414                 if (status->flag & RX_FLAG_SHORT_GI)
 415                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 416                 /* in VHT, STBC is binary */
 417                 if (status->flag & RX_FLAG_STBC_MASK)
 418                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 419                 if (status->vht_flag & RX_VHT_FLAG_BF)
 420                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 421                 pos++;
 422                 /* bandwidth */
 423                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 424                         *pos++ = 4;
 425                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 426                         *pos++ = 11;
 427                 else if (status->flag & RX_FLAG_40MHZ)
 428                         *pos++ = 1;
 429                 else /* 20 MHz */
 430                         *pos++ = 0;
 431                 /* MCS/NSS */
 432                 *pos = (status->rate_idx << 4) | status->vht_nss;
 433                 pos += 4;
 434                 /* coding field */
 435                 if (status->flag & RX_FLAG_LDPC)
 436                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 437                 pos++;
 438                 /* group ID */
 439                 pos++;
 440                 /* partial_aid */
 441                 pos += 2;
 442         }
 443
 444         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 445                 u16 accuracy = 0;
 446                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 447
 448                 rthdr->it_present |=
 449                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 450
 451                 /* ensure 8 byte alignment */
 452                 while ((pos - (u8 *)rthdr) & 7)
 453                         pos++;
 454
 455                 put_unaligned_le64(status->device_timestamp, pos);
 456                 pos += sizeof(u64);
 457
 458                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 459                         accuracy = local->hw.radiotap_timestamp.accuracy;
 460                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 461                 }
 462                 put_unaligned_le16(accuracy, pos);
 463                 pos += sizeof(u16);
 464
 465                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 466                 *pos++ = flags;
 467         }
 468
 469         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 470                 *pos++ = status->chain_signal[chain];
 471                 *pos++ = chain;
 472         }
 473
 474         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 475                 /* ensure 2 byte alignment for the vendor field as required */
 476                 if ((pos - (u8 *)rthdr) & 1)
 477                         *pos++ = 0;
 478                 *pos++ = rtap.oui[0];
 479                 *pos++ = rtap.oui[1];
 480                 *pos++ = rtap.oui[2];
 481                 *pos++ = rtap.subns;
 482                 put_unaligned_le16(rtap.len, pos);
 483                 pos += 2;
 484                 /* align the actual payload as requested */
 485                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 486                         *pos++ = 0;
 487                 /* data (and possible padding) already follows */
 488         }
 489 }
 490
 491 /*
 492  * This function copies a received frame to all monitor interfaces and
 493  * returns a cleaned-up SKB that no longer includes the FCS nor the
 494  * radiotap header the driver might have added.
 495  */
 496 static struct sk_buff *
 497 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 498                      struct ieee80211_rate *rate)
 499 {
 500         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 501         struct ieee80211_sub_if_data *sdata;
 502         int rt_hdrlen, needed_headroom;
 503         struct sk_buff *skb, *skb2;
 504         struct net_device *prev_dev = NULL;
 505         int present_fcs_len = 0;
 506         unsigned int rtap_vendor_space = 0;
 507         struct ieee80211_mgmt *mgmt;
 508         struct ieee80211_sub_if_data *monitor_sdata =
 509                 rcu_dereference(local->monitor_sdata);
 510
 511         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 512                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 513
 514                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 515         }
 516
 517         /*
 518          * First, we may need to make a copy of the skb because
 519          *  (1) we need to modify it for radiotap (if not present), and
 520          *  (2) the other RX handlers will modify the skb we got.
 521          *
 522          * We don't need to, of course, if we aren't going to return
 523          * the SKB because it has a bad FCS/PLCP checksum.
 524          */
 525
 526         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 527                 if (unlikely(origskb->len <= FCS_LEN)) {
 528                         /* driver bug */
 529                         WARN_ON(1);
 530                         dev_kfree_skb(origskb);
 531                         return NULL;
 532                 }
 533                 present_fcs_len = FCS_LEN;
 534         }
 535
 536         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 537         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 538                 dev_kfree_skb(origskb);
 539                 return NULL;
 540         }
 541
 542         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 543                 if (should_drop_frame(origskb, present_fcs_len,
 544                                       rtap_vendor_space)) {
 545                         dev_kfree_skb(origskb);
 546                         return NULL;
 547                 }
 548
 549                 remove_monitor_info(origskb, present_fcs_len,
 550                                     rtap_vendor_space);
 551                 return origskb;
 552         }
 553
 554         /* room for the radiotap header based on driver features */
 555         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 556         needed_headroom = rt_hdrlen - rtap_vendor_space;
 557
 558         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 559                 /* only need to expand headroom if necessary */
 560                 skb = origskb;
 561                 origskb = NULL;
 562
 563                 /*
 564                  * This shouldn't trigger often because most devices have an
 565                  * RX header they pull before we get here, and that should
 566                  * be big enough for our radiotap information. We should
 567                  * probably export the length to drivers so that we can have
 568                  * them allocate enough headroom to start with.
 569                  */
 570                 if (skb_headroom(skb) < needed_headroom &&
 571                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 572                         dev_kfree_skb(skb);
 573                         return NULL;
 574                 }
 575         } else {
 576                 /*
 577                  * Need to make a copy and possibly remove radiotap header
 578                  * and FCS from the original.
 579                  */
 580                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 581                 remove_monitor_info(origskb, present_fcs_len,
 582                                     rtap_vendor_space);
 583
 584                 if (!skb)
 585                         return origskb;
 586         }
 587
 588         /* prepend radiotap information */
 589         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 590
 591         skb_reset_mac_header(skb);
 592         skb->ip_summed = CHECKSUM_UNNECESSARY;
 593         skb->pkt_type = PACKET_OTHERHOST;
 594         skb->protocol = htons(ETH_P_802_2);
 595
 596         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 597                 if (prev_dev) {
 598                         skb2 = skb_clone(skb, GFP_ATOMIC);
 599                         if (skb2) {
 600                                 skb2->dev = prev_dev;
 601                                 netif_receive_skb(skb2);
 602                         }
 603                 }
 604
 605                 prev_dev = sdata->dev;
 606                 ieee80211_rx_stats(sdata->dev, skb->len);
 607         }
 608
 609         mgmt = (void *)skb->data;
 610         if (monitor_sdata &&
 611             skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
 612             ieee80211_is_action(mgmt->frame_control) &&
 613             mgmt->u.action.category == WLAN_CATEGORY_VHT &&
 614             mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
 615             is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
 616             ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
 617                 struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
 618
 619                 if (mu_skb) {
 620                         mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 621                         skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
 622                         ieee80211_queue_work(&local->hw, &monitor_sdata->work);
 623                 }
 624         }
 625
 626         if (prev_dev) {
 627                 skb->dev = prev_dev;
 628                 netif_receive_skb(skb);
 629         } else
 630                 dev_kfree_skb(skb);
 631
 632         return origskb;
 633 }
 634
 635 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 636 {
 637         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 638         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 639         int tid, seqno_idx, security_idx;
 640
 641         /* does the frame have a qos control field? */
 642         if (ieee80211_is_data_qos(hdr->frame_control)) {
 643                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 644                 /* frame has qos control */
 645                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 646                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 647                         status->rx_flags |= IEEE80211_RX_AMSDU;
 648
 649                 seqno_idx = tid;
 650                 security_idx = tid;
 651         } else {
 652                 /*
 653                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 654                  *
 655                  *      Sequence numbers for management frames, QoS data
 656                  *      frames with a broadcast/multicast address in the
 657                  *      Address 1 field, and all non-QoS data frames sent
 658                  *      by QoS STAs are assigned using an additional single
 659                  *      modulo-4096 counter, [...]
 660                  *
 661                  * We also use that counter for non-QoS STAs.
 662                  */
 663                 seqno_idx = IEEE80211_NUM_TIDS;
 664                 security_idx = 0;
 665                 if (ieee80211_is_mgmt(hdr->frame_control))
 666                         security_idx = IEEE80211_NUM_TIDS;
 667                 tid = 0;
 668         }
 669
 670         rx->seqno_idx = seqno_idx;
 671         rx->security_idx = security_idx;
 672         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 673          * For now, set skb->priority to 0 for other cases. */
 674         rx->skb->priority = (tid > 7) ? 0 : tid;
 675 }
 676
 677 /**
 678  * DOC: Packet alignment
 679  *
 680  * Drivers always need to pass packets that are aligned to two-byte boundaries
 681  * to the stack.
 682  *
 683  * Additionally, should, if possible, align the payload data in a way that
 684  * guarantees that the contained IP header is aligned to a four-byte
 685  * boundary. In the case of regular frames, this simply means aligning the
 686  * payload to a four-byte boundary (because either the IP header is directly
 687  * contained, or IV/RFC1042 headers that have a length divisible by four are
 688  * in front of it).  If the payload data is not properly aligned and the
 689  * architecture doesn't support efficient unaligned operations, mac80211
 690  * will align the data.
 691  *
 692  * With A-MSDU frames, however, the payload data address must yield two modulo
 693  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 694  * push the IP header further back to a multiple of four again. Thankfully, the
 695  * specs were sane enough this time around to require padding each A-MSDU
 696  * subframe to a length that is a multiple of four.
 697  *
 698  * Padding like Atheros hardware adds which is between the 802.11 header and
 699  * the payload is not supported, the driver is required to move the 802.11
 700  * header to be directly in front of the payload in that case.
 701  */
 702 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 703 {
 704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 705         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 706 #endif
 707 }
 708
 709
 710 /* rx handlers */
 711
 712 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 713 {
 714         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 715
 716         if (is_multicast_ether_addr(hdr->addr1))
 717                 return 0;
 718
 719         return ieee80211_is_robust_mgmt_frame(skb);
 720 }
 721
 722
 723 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 724 {
 725         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 726
 727         if (!is_multicast_ether_addr(hdr->addr1))
 728                 return 0;
 729
 730         return ieee80211_is_robust_mgmt_frame(skb);
 731 }
 732
 733
 734 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 735 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 736 {
 737         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 738         struct ieee80211_mmie *mmie;
 739         struct ieee80211_mmie_16 *mmie16;
 740
 741         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 742                 return -1;
 743
 744         if (!ieee80211_is_robust_mgmt_frame(skb))
 745                 return -1; /* not a robust management frame */
 746
 747         mmie = (struct ieee80211_mmie *)
 748                 (skb->data + skb->len - sizeof(*mmie));
 749         if (mmie->element_id == WLAN_EID_MMIE &&
 750             mmie->length == sizeof(*mmie) - 2)
 751                 return le16_to_cpu(mmie->key_id);
 752
 753         mmie16 = (struct ieee80211_mmie_16 *)
 754                 (skb->data + skb->len - sizeof(*mmie16));
 755         if (skb->len >= 24 + sizeof(*mmie16) &&
 756             mmie16->element_id == WLAN_EID_MMIE &&
 757             mmie16->length == sizeof(*mmie16) - 2)
 758                 return le16_to_cpu(mmie16->key_id);
 759
 760         return -1;
 761 }
 762
 763 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 764                                   struct sk_buff *skb)
 765 {
 766         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 767         __le16 fc;
 768         int hdrlen;
 769         u8 keyid;
 770
 771         fc = hdr->frame_control;
 772         hdrlen = ieee80211_hdrlen(fc);
 773
 774         if (skb->len < hdrlen + cs->hdr_len)
 775                 return -EINVAL;
 776
 777         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 778         keyid &= cs->key_idx_mask;
 779         keyid >>= cs->key_idx_shift;
 780
 781         return keyid;
 782 }
 783
 784 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 785 {
 786         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 787         char *dev_addr = rx->sdata->vif.addr;
 788
 789         if (ieee80211_is_data(hdr->frame_control)) {
 790                 if (is_multicast_ether_addr(hdr->addr1)) {
 791                         if (ieee80211_has_tods(hdr->frame_control) ||
 792                             !ieee80211_has_fromds(hdr->frame_control))
 793                                 return RX_DROP_MONITOR;
 794                         if (ether_addr_equal(hdr->addr3, dev_addr))
 795                                 return RX_DROP_MONITOR;
 796                 } else {
 797                         if (!ieee80211_has_a4(hdr->frame_control))
 798                                 return RX_DROP_MONITOR;
 799                         if (ether_addr_equal(hdr->addr4, dev_addr))
 800                                 return RX_DROP_MONITOR;
 801                 }
 802         }
 803
 804         /* If there is not an established peer link and this is not a peer link
 805          * establisment frame, beacon or probe, drop the frame.
 806          */
 807
 808         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 809                 struct ieee80211_mgmt *mgmt;
 810
 811                 if (!ieee80211_is_mgmt(hdr->frame_control))
 812                         return RX_DROP_MONITOR;
 813
 814                 if (ieee80211_is_action(hdr->frame_control)) {
 815                         u8 category;
 816
 817                         /* make sure category field is present */
 818                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 819                                 return RX_DROP_MONITOR;
 820
 821                         mgmt = (struct ieee80211_mgmt *)hdr;
 822                         category = mgmt->u.action.category;
 823                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 824                             category != WLAN_CATEGORY_SELF_PROTECTED)
 825                                 return RX_DROP_MONITOR;
 826                         return RX_CONTINUE;
 827                 }
 828
 829                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 830                     ieee80211_is_probe_resp(hdr->frame_control) ||
 831                     ieee80211_is_beacon(hdr->frame_control) ||
 832                     ieee80211_is_auth(hdr->frame_control))
 833                         return RX_CONTINUE;
 834
 835                 return RX_DROP_MONITOR;
 836         }
 837
 838         return RX_CONTINUE;
 839 }
 840
 841 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 842                                               int index)
 843 {
 844         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 845         struct sk_buff *tail = skb_peek_tail(frames);
 846         struct ieee80211_rx_status *status;
 847
 848         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 849                 return true;
 850
 851         if (!tail)
 852                 return false;
 853
 854         status = IEEE80211_SKB_RXCB(tail);
 855         if (status->flag & RX_FLAG_AMSDU_MORE)
 856                 return false;
 857
 858         return true;
 859 }
 860
 861 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 862                                             struct tid_ampdu_rx *tid_agg_rx,
 863                                             int index,
 864                                             struct sk_buff_head *frames)
 865 {
 866         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 867         struct sk_buff *skb;
 868         struct ieee80211_rx_status *status;
 869
 870         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 871
 872         if (skb_queue_empty(skb_list))
 873                 goto no_frame;
 874
 875         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 876                 __skb_queue_purge(skb_list);
 877                 goto no_frame;
 878         }
 879
 880         /* release frames from the reorder ring buffer */
 881         tid_agg_rx->stored_mpdu_num--;
 882         while ((skb = __skb_dequeue(skb_list))) {
 883                 status = IEEE80211_SKB_RXCB(skb);
 884                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 885                 __skb_queue_tail(frames, skb);
 886         }
 887
 888 no_frame:
 889         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 890         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 891 }
 892
 893 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 894                                              struct tid_ampdu_rx *tid_agg_rx,
 895                                              u16 head_seq_num,
 896                                              struct sk_buff_head *frames)
 897 {
 898         int index;
 899
 900         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 901
 902         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 903                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 904                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 905                                                 frames);
 906         }
 907 }
 908
 909 /*
 910  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 911  * the skb was added to the buffer longer than this time ago, the earlier
 912  * frames that have not yet been received are assumed to be lost and the skb
 913  * can be released for processing. This may also release other skb's from the
 914  * reorder buffer if there are no additional gaps between the frames.
 915  *
 916  * Callers must hold tid_agg_rx->reorder_lock.
 917  */
 918 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 919
 920 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 921                                           struct tid_ampdu_rx *tid_agg_rx,
 922                                           struct sk_buff_head *frames)
 923 {
 924         int index, i, j;
 925
 926         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 927
 928         /* release the buffer until next missing frame */
 929         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 930         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 931             tid_agg_rx->stored_mpdu_num) {
 932                 /*
 933                  * No buffers ready to be released, but check whether any
 934                  * frames in the reorder buffer have timed out.
 935                  */
 936                 int skipped = 1;
 937                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 938                      j = (j + 1) % tid_agg_rx->buf_size) {
 939                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
 940                                 skipped++;
 941                                 continue;
 942                         }
 943                         if (skipped &&
 944                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 945                                         HT_RX_REORDER_BUF_TIMEOUT))
 946                                 goto set_release_timer;
 947
 948                         /* don't leave incomplete A-MSDUs around */
 949                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 950                              i = (i + 1) % tid_agg_rx->buf_size)
 951                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 952
 953                         ht_dbg_ratelimited(sdata,
 954                                            "release an RX reorder frame due to timeout on earlier frames\n");
 955                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 956                                                         frames);
 957
 958                         /*
 959                          * Increment the head seq# also for the skipped slots.
 960                          */
 961                         tid_agg_rx->head_seq_num =
 962                                 (tid_agg_rx->head_seq_num +
 963                                  skipped) & IEEE80211_SN_MASK;
 964                         skipped = 0;
 965                 }
 966         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 967                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 968                                                 frames);
 969                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 970         }
 971
 972         if (tid_agg_rx->stored_mpdu_num) {
 973                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 974
 975                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 976                      j = (j + 1) % tid_agg_rx->buf_size) {
 977                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
 978                                 break;
 979                 }
 980
 981  set_release_timer:
 982
 983                 if (!tid_agg_rx->removed)
 984                         mod_timer(&tid_agg_rx->reorder_timer,
 985                                   tid_agg_rx->reorder_time[j] + 1 +
 986                                   HT_RX_REORDER_BUF_TIMEOUT);
 987         } else {
 988                 del_timer(&tid_agg_rx->reorder_timer);
 989         }
 990 }
 991
 992 /*
 993  * As this function belongs to the RX path it must be under
 994  * rcu_read_lock protection. It returns false if the frame
 995  * can be processed immediately, true if it was consumed.
 996  */
 997 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 998                                              struct tid_ampdu_rx *tid_agg_rx,
 999                                              struct sk_buff *skb,
1000                                              struct sk_buff_head *frames)
1001 {
1002         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1003         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1004         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1005         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1006         u16 head_seq_num, buf_size;
1007         int index;
1008         bool ret = true;
1009
1010         spin_lock(&tid_agg_rx->reorder_lock);
1011
1012         /*
1013          * Offloaded BA sessions have no known starting sequence number so pick
1014          * one from first Rxed frame for this tid after BA was started.
1015          */
1016         if (unlikely(tid_agg_rx->auto_seq)) {
1017                 tid_agg_rx->auto_seq = false;
1018                 tid_agg_rx->ssn = mpdu_seq_num;
1019                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1020         }
1021
1022         buf_size = tid_agg_rx->buf_size;
1023         head_seq_num = tid_agg_rx->head_seq_num;
1024
1025         /*
1026          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1027          * be reordered.
1028          */
1029         if (unlikely(!tid_agg_rx->started)) {
1030                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1031                         ret = false;
1032                         goto out;
1033                 }
1034                 tid_agg_rx->started = true;
1035         }
1036
1037         /* frame with out of date sequence number */
1038         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1039                 dev_kfree_skb(skb);
1040                 goto out;
1041         }
1042
1043         /*
1044          * If frame the sequence number exceeds our buffering window
1045          * size release some previous frames to make room for this one.
1046          */
1047         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1048                 head_seq_num = ieee80211_sn_inc(
1049                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1050                 /* release stored frames up to new head to stack */
1051                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1052                                                  head_seq_num, frames);
1053         }
1054
1055         /* Now the new frame is always in the range of the reordering buffer */
1056
1057         index = mpdu_seq_num % tid_agg_rx->buf_size;
1058
1059         /* check if we already stored this frame */
1060         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1061                 dev_kfree_skb(skb);
1062                 goto out;
1063         }
1064
1065         /*
1066          * If the current MPDU is in the right order and nothing else
1067          * is stored we can process it directly, no need to buffer it.
1068          * If it is first but there's something stored, we may be able
1069          * to release frames after this one.
1070          */
1071         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1072             tid_agg_rx->stored_mpdu_num == 0) {
1073                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1074                         tid_agg_rx->head_seq_num =
1075                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1076                 ret = false;
1077                 goto out;
1078         }
1079
1080         /* put the frame in the reordering buffer */
1081         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1082         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1083                 tid_agg_rx->reorder_time[index] = jiffies;
1084                 tid_agg_rx->stored_mpdu_num++;
1085                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1086         }
1087
1088  out:
1089         spin_unlock(&tid_agg_rx->reorder_lock);
1090         return ret;
1091 }
1092
1093 /*
1094  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095  * true if the MPDU was buffered, false if it should be processed.
1096  */
1097 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1098                                        struct sk_buff_head *frames)
1099 {
1100         struct sk_buff *skb = rx->skb;
1101         struct ieee80211_local *local = rx->local;
1102         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1103         struct sta_info *sta = rx->sta;
1104         struct tid_ampdu_rx *tid_agg_rx;
1105         u16 sc;
1106         u8 tid, ack_policy;
1107
1108         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1109             is_multicast_ether_addr(hdr->addr1))
1110                 goto dont_reorder;
1111
1112         /*
1113          * filter the QoS data rx stream according to
1114          * STA/TID and check if this STA/TID is on aggregation
1115          */
1116
1117         if (!sta)
1118                 goto dont_reorder;
1119
1120         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1121                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1122         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1123
1124         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1125         if (!tid_agg_rx) {
1126                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1127                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1128                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1129                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1130                                              WLAN_BACK_RECIPIENT,
1131                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1132                 goto dont_reorder;
1133         }
1134
1135         /* qos null data frames are excluded */
1136         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1137                 goto dont_reorder;
1138
1139         /* not part of a BA session */
1140         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1141             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1142                 goto dont_reorder;
1143
1144         /* new, potentially un-ordered, ampdu frame - process it */
1145
1146         /* reset session timer */
1147         if (tid_agg_rx->timeout)
1148                 tid_agg_rx->last_rx = jiffies;
1149
1150         /* if this mpdu is fragmented - terminate rx aggregation session */
1151         sc = le16_to_cpu(hdr->seq_ctrl);
1152         if (sc & IEEE80211_SCTL_FRAG) {
1153                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1154                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1155                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1156                 return;
1157         }
1158
1159         /*
1160          * No locking needed -- we will only ever process one
1161          * RX packet at a time, and thus own tid_agg_rx. All
1162          * other code manipulating it needs to (and does) make
1163          * sure that we cannot get to it any more before doing
1164          * anything with it.
1165          */
1166         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1167                                              frames))
1168                 return;
1169
1170  dont_reorder:
1171         __skb_queue_tail(frames, skb);
1172 }
1173
1174 static ieee80211_rx_result debug_noinline
1175 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1176 {
1177         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1178         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1179
1180         if (status->flag & RX_FLAG_DUP_VALIDATED)
1181                 return RX_CONTINUE;
1182
1183         /*
1184          * Drop duplicate 802.11 retransmissions
1185          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1186          */
1187
1188         if (rx->skb->len < 24)
1189                 return RX_CONTINUE;
1190
1191         if (ieee80211_is_ctl(hdr->frame_control) ||
1192             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1193             is_multicast_ether_addr(hdr->addr1))
1194                 return RX_CONTINUE;
1195
1196         if (!rx->sta)
1197                 return RX_CONTINUE;
1198
1199         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1200                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1201                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1202                 rx->sta->rx_stats.num_duplicates++;
1203                 return RX_DROP_UNUSABLE;
1204         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1205                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1206         }
1207
1208         return RX_CONTINUE;
1209 }
1210
1211 static ieee80211_rx_result debug_noinline
1212 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1213 {
1214         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1215
1216         /* Drop disallowed frame classes based on STA auth/assoc state;
1217          * IEEE 802.11, Chap 5.5.
1218          *
1219          * mac80211 filters only based on association state, i.e. it drops
1220          * Class 3 frames from not associated stations. hostapd sends
1221          * deauth/disassoc frames when needed. In addition, hostapd is
1222          * responsible for filtering on both auth and assoc states.
1223          */
1224
1225         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1226                 return ieee80211_rx_mesh_check(rx);
1227
1228         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1229                       ieee80211_is_pspoll(hdr->frame_control)) &&
1230                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1231                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1232                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1233                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1234                 /*
1235                  * accept port control frames from the AP even when it's not
1236                  * yet marked ASSOC to prevent a race where we don't set the
1237                  * assoc bit quickly enough before it sends the first frame
1238                  */
1239                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1240                     ieee80211_is_data_present(hdr->frame_control)) {
1241                         unsigned int hdrlen;
1242                         __be16 ethertype;
1243
1244                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1245
1246                         if (rx->skb->len < hdrlen + 8)
1247                                 return RX_DROP_MONITOR;
1248
1249                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1250                         if (ethertype == rx->sdata->control_port_protocol)
1251                                 return RX_CONTINUE;
1252                 }
1253
1254                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1255                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1256                                                hdr->addr2,
1257                                                GFP_ATOMIC))
1258                         return RX_DROP_UNUSABLE;
1259
1260                 return RX_DROP_MONITOR;
1261         }
1262
1263         return RX_CONTINUE;
1264 }
1265
1266
1267 static ieee80211_rx_result debug_noinline
1268 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1269 {
1270         struct ieee80211_local *local;
1271         struct ieee80211_hdr *hdr;
1272         struct sk_buff *skb;
1273
1274         local = rx->local;
1275         skb = rx->skb;
1276         hdr = (struct ieee80211_hdr *) skb->data;
1277
1278         if (!local->pspolling)
1279                 return RX_CONTINUE;
1280
1281         if (!ieee80211_has_fromds(hdr->frame_control))
1282                 /* this is not from AP */
1283                 return RX_CONTINUE;
1284
1285         if (!ieee80211_is_data(hdr->frame_control))
1286                 return RX_CONTINUE;
1287
1288         if (!ieee80211_has_moredata(hdr->frame_control)) {
1289                 /* AP has no more frames buffered for us */
1290                 local->pspolling = false;
1291                 return RX_CONTINUE;
1292         }
1293
1294         /* more data bit is set, let's request a new frame from the AP */
1295         ieee80211_send_pspoll(local, rx->sdata);
1296
1297         return RX_CONTINUE;
1298 }
1299
1300 static void sta_ps_start(struct sta_info *sta)
1301 {
1302         struct ieee80211_sub_if_data *sdata = sta->sdata;
1303         struct ieee80211_local *local = sdata->local;
1304         struct ps_data *ps;
1305         int tid;
1306
1307         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1308             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1309                 ps = &sdata->bss->ps;
1310         else
1311                 return;
1312
1313         atomic_inc(&ps->num_sta_ps);
1314         set_sta_flag(sta, WLAN_STA_PS_STA);
1315         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1316                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1317         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1318                sta->sta.addr, sta->sta.aid);
1319
1320         ieee80211_clear_fast_xmit(sta);
1321
1322         if (!sta->sta.txq[0])
1323                 return;
1324
1325         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1326                 if (txq_has_queue(sta->sta.txq[tid]))
1327                         set_bit(tid, &sta->txq_buffered_tids);
1328                 else
1329                         clear_bit(tid, &sta->txq_buffered_tids);
1330         }
1331 }
1332
1333 static void sta_ps_end(struct sta_info *sta)
1334 {
1335         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1336                sta->sta.addr, sta->sta.aid);
1337
1338         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1339                 /*
1340                  * Clear the flag only if the other one is still set
1341                  * so that the TX path won't start TX'ing new frames
1342                  * directly ... In the case that the driver flag isn't
1343                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1344                  */
1345                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1346                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1347                        sta->sta.addr, sta->sta.aid);
1348                 return;
1349         }
1350
1351         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1352         clear_sta_flag(sta, WLAN_STA_PS_STA);
1353         ieee80211_sta_ps_deliver_wakeup(sta);
1354 }
1355
1356 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1357 {
1358         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1359         bool in_ps;
1360
1361         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1362
1363         /* Don't let the same PS state be set twice */
1364         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1365         if ((start && in_ps) || (!start && !in_ps))
1366                 return -EINVAL;
1367
1368         if (start)
1369                 sta_ps_start(sta);
1370         else
1371                 sta_ps_end(sta);
1372
1373         return 0;
1374 }
1375 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1376
1377 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1378 {
1379         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1380
1381         if (test_sta_flag(sta, WLAN_STA_SP))
1382                 return;
1383
1384         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1385                 ieee80211_sta_ps_deliver_poll_response(sta);
1386         else
1387                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1388 }
1389 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1390
1391 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1392 {
1393         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1394         int ac = ieee80211_ac_from_tid(tid);
1395
1396         /*
1397          * If this AC is not trigger-enabled do nothing unless the
1398          * driver is calling us after it already checked.
1399          *
1400          * NB: This could/should check a separate bitmap of trigger-
1401          * enabled queues, but for now we only implement uAPSD w/o
1402          * TSPEC changes to the ACs, so they're always the same.
1403          */
1404         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1405             tid != IEEE80211_NUM_TIDS)
1406                 return;
1407
1408         /* if we are in a service period, do nothing */
1409         if (test_sta_flag(sta, WLAN_STA_SP))
1410                 return;
1411
1412         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1413                 ieee80211_sta_ps_deliver_uapsd(sta);
1414         else
1415                 set_sta_flag(sta, WLAN_STA_UAPSD);
1416 }
1417 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1418
1419 static ieee80211_rx_result debug_noinline
1420 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1421 {
1422         struct ieee80211_sub_if_data *sdata = rx->sdata;
1423         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1424         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1425
1426         if (!rx->sta)
1427                 return RX_CONTINUE;
1428
1429         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1430             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1431                 return RX_CONTINUE;
1432
1433         /*
1434          * The device handles station powersave, so don't do anything about
1435          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1436          * it to mac80211 since they're handled.)
1437          */
1438         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1439                 return RX_CONTINUE;
1440
1441         /*
1442          * Don't do anything if the station isn't already asleep. In
1443          * the uAPSD case, the station will probably be marked asleep,
1444          * in the PS-Poll case the station must be confused ...
1445          */
1446         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1447                 return RX_CONTINUE;
1448
1449         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1450                 ieee80211_sta_pspoll(&rx->sta->sta);
1451
1452                 /* Free PS Poll skb here instead of returning RX_DROP that would
1453                  * count as an dropped frame. */
1454                 dev_kfree_skb(rx->skb);
1455
1456                 return RX_QUEUED;
1457         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1458                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1459                    ieee80211_has_pm(hdr->frame_control) &&
1460                    (ieee80211_is_data_qos(hdr->frame_control) ||
1461                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1462                 u8 tid;
1463
1464                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1465
1466                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1467         }
1468
1469         return RX_CONTINUE;
1470 }
1471
1472 static ieee80211_rx_result debug_noinline
1473 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1474 {
1475         struct sta_info *sta = rx->sta;
1476         struct sk_buff *skb = rx->skb;
1477         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1478         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1479         int i;
1480
1481         if (!sta)
1482                 return RX_CONTINUE;
1483
1484         /*
1485          * Update last_rx only for IBSS packets which are for the current
1486          * BSSID and for station already AUTHORIZED to avoid keeping the
1487          * current IBSS network alive in cases where other STAs start
1488          * using different BSSID. This will also give the station another
1489          * chance to restart the authentication/authorization in case
1490          * something went wrong the first time.
1491          */
1492         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1493                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1494                                                 NL80211_IFTYPE_ADHOC);
1495                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1496                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1497                         sta->rx_stats.last_rx = jiffies;
1498                         if (ieee80211_is_data(hdr->frame_control) &&
1499                             !is_multicast_ether_addr(hdr->addr1))
1500                                 sta->rx_stats.last_rate =
1501                                         sta_stats_encode_rate(status);
1502                 }
1503         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1504                 sta->rx_stats.last_rx = jiffies;
1505         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1506                 /*
1507                  * Mesh beacons will update last_rx when if they are found to
1508                  * match the current local configuration when processed.
1509                  */
1510                 sta->rx_stats.last_rx = jiffies;
1511                 if (ieee80211_is_data(hdr->frame_control))
1512                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1513         }
1514
1515         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1516                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1517
1518         sta->rx_stats.fragments++;
1519
1520         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1521         sta->rx_stats.bytes += rx->skb->len;
1522         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1523
1524         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1525                 sta->rx_stats.last_signal = status->signal;
1526                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1527         }
1528
1529         if (status->chains) {
1530                 sta->rx_stats.chains = status->chains;
1531                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1532                         int signal = status->chain_signal[i];
1533
1534                         if (!(status->chains & BIT(i)))
1535                                 continue;
1536
1537                         sta->rx_stats.chain_signal_last[i] = signal;
1538                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1539                                         -signal);
1540                 }
1541         }
1542
1543         /*
1544          * Change STA power saving mode only at the end of a frame
1545          * exchange sequence.
1546          */
1547         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1548             !ieee80211_has_morefrags(hdr->frame_control) &&
1549             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1550             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1551              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1552             /* PM bit is only checked in frames where it isn't reserved,
1553              * in AP mode it's reserved in non-bufferable management frames
1554              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1555              */
1556             (!ieee80211_is_mgmt(hdr->frame_control) ||
1557              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1558                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1559                         if (!ieee80211_has_pm(hdr->frame_control))
1560                                 sta_ps_end(sta);
1561                 } else {
1562                         if (ieee80211_has_pm(hdr->frame_control))
1563                                 sta_ps_start(sta);
1564                 }
1565         }
1566
1567         /* mesh power save support */
1568         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1569                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1570
1571         /*
1572          * Drop (qos-)data::nullfunc frames silently, since they
1573          * are used only to control station power saving mode.
1574          */
1575         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1576             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1577                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1578
1579                 /*
1580                  * If we receive a 4-addr nullfunc frame from a STA
1581                  * that was not moved to a 4-addr STA vlan yet send
1582                  * the event to userspace and for older hostapd drop
1583                  * the frame to the monitor interface.
1584                  */
1585                 if (ieee80211_has_a4(hdr->frame_control) &&
1586                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1587                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1588                       !rx->sdata->u.vlan.sta))) {
1589                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1590                                 cfg80211_rx_unexpected_4addr_frame(
1591                                         rx->sdata->dev, sta->sta.addr,
1592                                         GFP_ATOMIC);
1593                         return RX_DROP_MONITOR;
1594                 }
1595                 /*
1596                  * Update counter and free packet here to avoid
1597                  * counting this as a dropped packed.
1598                  */
1599                 sta->rx_stats.packets++;
1600                 dev_kfree_skb(rx->skb);
1601                 return RX_QUEUED;
1602         }
1603
1604         return RX_CONTINUE;
1605 } /* ieee80211_rx_h_sta_process */
1606
1607 static ieee80211_rx_result debug_noinline
1608 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1609 {
1610         struct sk_buff *skb = rx->skb;
1611         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1612         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1613         int keyidx;
1614         int hdrlen;
1615         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1616         struct ieee80211_key *sta_ptk = NULL;
1617         int mmie_keyidx = -1;
1618         __le16 fc;
1619         const struct ieee80211_cipher_scheme *cs = NULL;
1620
1621         /*
1622          * Key selection 101
1623          *
1624          * There are four types of keys:
1625          *  - GTK (group keys)
1626          *  - IGTK (group keys for management frames)
1627          *  - PTK (pairwise keys)
1628          *  - STK (station-to-station pairwise keys)
1629          *
1630          * When selecting a key, we have to distinguish between multicast
1631          * (including broadcast) and unicast frames, the latter can only
1632          * use PTKs and STKs while the former always use GTKs and IGTKs.
1633          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1634          * unicast frames can also use key indices like GTKs. Hence, if we
1635          * don't have a PTK/STK we check the key index for a WEP key.
1636          *
1637          * Note that in a regular BSS, multicast frames are sent by the
1638          * AP only, associated stations unicast the frame to the AP first
1639          * which then multicasts it on their behalf.
1640          *
1641          * There is also a slight problem in IBSS mode: GTKs are negotiated
1642          * with each station, that is something we don't currently handle.
1643          * The spec seems to expect that one negotiates the same key with
1644          * every station but there's no such requirement; VLANs could be
1645          * possible.
1646          */
1647
1648         /* start without a key */
1649         rx->key = NULL;
1650         fc = hdr->frame_control;
1651
1652         if (rx->sta) {
1653                 int keyid = rx->sta->ptk_idx;
1654
1655                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1656                         cs = rx->sta->cipher_scheme;
1657                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1658                         if (unlikely(keyid < 0))
1659                                 return RX_DROP_UNUSABLE;
1660                 }
1661                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1662         }
1663
1664         if (!ieee80211_has_protected(fc))
1665                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1666
1667         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1668                 rx->key = sta_ptk;
1669                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1670                     (status->flag & RX_FLAG_IV_STRIPPED))
1671                         return RX_CONTINUE;
1672                 /* Skip decryption if the frame is not protected. */
1673                 if (!ieee80211_has_protected(fc))
1674                         return RX_CONTINUE;
1675         } else if (mmie_keyidx >= 0) {
1676                 /* Broadcast/multicast robust management frame / BIP */
1677                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1678                     (status->flag & RX_FLAG_IV_STRIPPED))
1679                         return RX_CONTINUE;
1680
1681                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1682                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1683                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1684                 if (rx->sta) {
1685                         if (ieee80211_is_group_privacy_action(skb) &&
1686                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1687                                 return RX_DROP_MONITOR;
1688
1689                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1690                 }
1691                 if (!rx->key)
1692                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1693         } else if (!ieee80211_has_protected(fc)) {
1694                 /*
1695                  * The frame was not protected, so skip decryption. However, we
1696                  * need to set rx->key if there is a key that could have been
1697                  * used so that the frame may be dropped if encryption would
1698                  * have been expected.
1699                  */
1700                 struct ieee80211_key *key = NULL;
1701                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1702                 int i;
1703
1704                 if (ieee80211_is_mgmt(fc) &&
1705                     is_multicast_ether_addr(hdr->addr1) &&
1706                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1707                         rx->key = key;
1708                 else {
1709                         if (rx->sta) {
1710                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1711                                         key = rcu_dereference(rx->sta->gtk[i]);
1712                                         if (key)
1713                                                 break;
1714                                 }
1715                         }
1716                         if (!key) {
1717                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1718                                         key = rcu_dereference(sdata->keys[i]);
1719                                         if (key)
1720                                                 break;
1721                                 }
1722                         }
1723                         if (key)
1724                                 rx->key = key;
1725                 }
1726                 return RX_CONTINUE;
1727         } else {
1728                 u8 keyid;
1729
1730                 /*
1731                  * The device doesn't give us the IV so we won't be
1732                  * able to look up the key. That's ok though, we
1733                  * don't need to decrypt the frame, we just won't
1734                  * be able to keep statistics accurate.
1735                  * Except for key threshold notifications, should
1736                  * we somehow allow the driver to tell us which key
1737                  * the hardware used if this flag is set?
1738                  */
1739                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1740                     (status->flag & RX_FLAG_IV_STRIPPED))
1741                         return RX_CONTINUE;
1742
1743                 hdrlen = ieee80211_hdrlen(fc);
1744
1745                 if (cs) {
1746                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1747
1748                         if (unlikely(keyidx < 0))
1749                                 return RX_DROP_UNUSABLE;
1750                 } else {
1751                         if (rx->skb->len < 8 + hdrlen)
1752                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1753                         /*
1754                          * no need to call ieee80211_wep_get_keyidx,
1755                          * it verifies a bunch of things we've done already
1756                          */
1757                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1758                         keyidx = keyid >> 6;
1759                 }
1760
1761                 /* check per-station GTK first, if multicast packet */
1762                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1763                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1764
1765                 /* if not found, try default key */
1766                 if (!rx->key) {
1767                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1768
1769                         /*
1770                          * RSNA-protected unicast frames should always be
1771                          * sent with pairwise or station-to-station keys,
1772                          * but for WEP we allow using a key index as well.
1773                          */
1774                         if (rx->key &&
1775                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1776                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1777                             !is_multicast_ether_addr(hdr->addr1))
1778                                 rx->key = NULL;
1779                 }
1780         }
1781
1782         if (rx->key) {
1783                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1784                         return RX_DROP_MONITOR;
1785
1786                 /* TODO: add threshold stuff again */
1787         } else {
1788                 return RX_DROP_MONITOR;
1789         }
1790
1791         switch (rx->key->conf.cipher) {
1792         case WLAN_CIPHER_SUITE_WEP40:
1793         case WLAN_CIPHER_SUITE_WEP104:
1794                 result = ieee80211_crypto_wep_decrypt(rx);
1795                 break;
1796         case WLAN_CIPHER_SUITE_TKIP:
1797                 result = ieee80211_crypto_tkip_decrypt(rx);
1798                 break;
1799         case WLAN_CIPHER_SUITE_CCMP:
1800                 result = ieee80211_crypto_ccmp_decrypt(
1801                         rx, IEEE80211_CCMP_MIC_LEN);
1802                 break;
1803         case WLAN_CIPHER_SUITE_CCMP_256:
1804                 result = ieee80211_crypto_ccmp_decrypt(
1805                         rx, IEEE80211_CCMP_256_MIC_LEN);
1806                 break;
1807         case WLAN_CIPHER_SUITE_AES_CMAC:
1808                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1809                 break;
1810         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1811                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1812                 break;
1813         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1814         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1815                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1816                 break;
1817         case WLAN_CIPHER_SUITE_GCMP:
1818         case WLAN_CIPHER_SUITE_GCMP_256:
1819                 result = ieee80211_crypto_gcmp_decrypt(rx);
1820                 break;
1821         default:
1822                 result = ieee80211_crypto_hw_decrypt(rx);
1823         }
1824
1825         /* the hdr variable is invalid after the decrypt handlers */
1826
1827         /* either the frame has been decrypted or will be dropped */
1828         status->flag |= RX_FLAG_DECRYPTED;
1829
1830         return result;
1831 }
1832
1833 static inline struct ieee80211_fragment_entry *
1834 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1835                          unsigned int frag, unsigned int seq, int rx_queue,
1836                          struct sk_buff **skb)
1837 {
1838         struct ieee80211_fragment_entry *entry;
1839
1840         entry = &sdata->fragments[sdata->fragment_next++];
1841         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1842                 sdata->fragment_next = 0;
1843
1844         if (!skb_queue_empty(&entry->skb_list))
1845                 __skb_queue_purge(&entry->skb_list);
1846
1847         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1848         *skb = NULL;
1849         entry->first_frag_time = jiffies;
1850         entry->seq = seq;
1851         entry->rx_queue = rx_queue;
1852         entry->last_frag = frag;
1853         entry->check_sequential_pn = false;
1854         entry->extra_len = 0;
1855
1856         return entry;
1857 }
1858
1859 static inline struct ieee80211_fragment_entry *
1860 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1861                           unsigned int frag, unsigned int seq,
1862                           int rx_queue, struct ieee80211_hdr *hdr)
1863 {
1864         struct ieee80211_fragment_entry *entry;
1865         int i, idx;
1866
1867         idx = sdata->fragment_next;
1868         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1869                 struct ieee80211_hdr *f_hdr;
1870
1871                 idx--;
1872                 if (idx < 0)
1873                         idx = IEEE80211_FRAGMENT_MAX - 1;
1874
1875                 entry = &sdata->fragments[idx];
1876                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1877                     entry->rx_queue != rx_queue ||
1878                     entry->last_frag + 1 != frag)
1879                         continue;
1880
1881                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1882
1883                 /*
1884                  * Check ftype and addresses are equal, else check next fragment
1885                  */
1886                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1887                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1888                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1889                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1890                         continue;
1891
1892                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1893                         __skb_queue_purge(&entry->skb_list);
1894                         continue;
1895                 }
1896                 return entry;
1897         }
1898
1899         return NULL;
1900 }
1901
1902 static ieee80211_rx_result debug_noinline
1903 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1904 {
1905         struct ieee80211_hdr *hdr;
1906         u16 sc;
1907         __le16 fc;
1908         unsigned int frag, seq;
1909         struct ieee80211_fragment_entry *entry;
1910         struct sk_buff *skb;
1911
1912         hdr = (struct ieee80211_hdr *)rx->skb->data;
1913         fc = hdr->frame_control;
1914
1915         if (ieee80211_is_ctl(fc))
1916                 return RX_CONTINUE;
1917
1918         sc = le16_to_cpu(hdr->seq_ctrl);
1919         frag = sc & IEEE80211_SCTL_FRAG;
1920
1921         if (is_multicast_ether_addr(hdr->addr1)) {
1922                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1923                 goto out_no_led;
1924         }
1925
1926         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1927                 goto out;
1928
1929         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1930
1931         if (skb_linearize(rx->skb))
1932                 return RX_DROP_UNUSABLE;
1933
1934         /*
1935          *  skb_linearize() might change the skb->data and
1936          *  previously cached variables (in this case, hdr) need to
1937          *  be refreshed with the new data.
1938          */
1939         hdr = (struct ieee80211_hdr *)rx->skb->data;
1940         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1941
1942         if (frag == 0) {
1943                 /* This is the first fragment of a new frame. */
1944                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1945                                                  rx->seqno_idx, &(rx->skb));
1946                 if (rx->key &&
1947                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1948                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1949                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1950                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1951                     ieee80211_has_protected(fc)) {
1952                         int queue = rx->security_idx;
1953
1954                         /* Store CCMP/GCMP PN so that we can verify that the
1955                          * next fragment has a sequential PN value.
1956                          */
1957                         entry->check_sequential_pn = true;
1958                         memcpy(entry->last_pn,
1959                                rx->key->u.ccmp.rx_pn[queue],
1960                                IEEE80211_CCMP_PN_LEN);
1961                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1962                                               u.ccmp.rx_pn) !=
1963                                      offsetof(struct ieee80211_key,
1964                                               u.gcmp.rx_pn));
1965                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1966                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1967                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1968                                      IEEE80211_GCMP_PN_LEN);
1969                 }
1970                 return RX_QUEUED;
1971         }
1972
1973         /* This is a fragment for a frame that should already be pending in
1974          * fragment cache. Add this fragment to the end of the pending entry.
1975          */
1976         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1977                                           rx->seqno_idx, hdr);
1978         if (!entry) {
1979                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1980                 return RX_DROP_MONITOR;
1981         }
1982
1983         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1984          *  MPDU PN values are not incrementing in steps of 1."
1985          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1986          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1987          */
1988         if (entry->check_sequential_pn) {
1989                 int i;
1990                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1991                 int queue;
1992
1993                 if (!rx->key ||
1994                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1995                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1996                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1997                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1998                         return RX_DROP_UNUSABLE;
1999                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2000                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2001                         pn[i]++;
2002                         if (pn[i])
2003                                 break;
2004                 }
2005                 queue = rx->security_idx;
2006                 rpn = rx->key->u.ccmp.rx_pn[queue];
2007                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2008                         return RX_DROP_UNUSABLE;
2009                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2010         }
2011
2012         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2013         __skb_queue_tail(&entry->skb_list, rx->skb);
2014         entry->last_frag = frag;
2015         entry->extra_len += rx->skb->len;
2016         if (ieee80211_has_morefrags(fc)) {
2017                 rx->skb = NULL;
2018                 return RX_QUEUED;
2019         }
2020
2021         rx->skb = __skb_dequeue(&entry->skb_list);
2022         if (skb_tailroom(rx->skb) < entry->extra_len) {
2023                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2024                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2025                                               GFP_ATOMIC))) {
2026                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2027                         __skb_queue_purge(&entry->skb_list);
2028                         return RX_DROP_UNUSABLE;
2029                 }
2030         }
2031         while ((skb = __skb_dequeue(&entry->skb_list))) {
2032                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2033                 dev_kfree_skb(skb);
2034         }
2035
2036  out:
2037         ieee80211_led_rx(rx->local);
2038  out_no_led:
2039         if (rx->sta)
2040                 rx->sta->rx_stats.packets++;
2041         return RX_CONTINUE;
2042 }
2043
2044 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2045 {
2046         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2047                 return -EACCES;
2048
2049         return 0;
2050 }
2051
2052 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2053 {
2054         struct sk_buff *skb = rx->skb;
2055         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2056
2057         /*
2058          * Pass through unencrypted frames if the hardware has
2059          * decrypted them already.
2060          */
2061         if (status->flag & RX_FLAG_DECRYPTED)
2062                 return 0;
2063
2064         /* Drop unencrypted frames if key is set. */
2065         if (unlikely(!ieee80211_has_protected(fc) &&
2066                      !ieee80211_is_nullfunc(fc) &&
2067                      ieee80211_is_data(fc) && rx->key))
2068                 return -EACCES;
2069
2070         return 0;
2071 }
2072
2073 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2074 {
2075         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2076         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2077         __le16 fc = hdr->frame_control;
2078
2079         /*
2080          * Pass through unencrypted frames if the hardware has
2081          * decrypted them already.
2082          */
2083         if (status->flag & RX_FLAG_DECRYPTED)
2084                 return 0;
2085
2086         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2087                 if (unlikely(!ieee80211_has_protected(fc) &&
2088                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2089                              rx->key)) {
2090                         if (ieee80211_is_deauth(fc) ||
2091                             ieee80211_is_disassoc(fc))
2092                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2093                                                              rx->skb->data,
2094                                                              rx->skb->len);
2095                         return -EACCES;
2096                 }
2097                 /* BIP does not use Protected field, so need to check MMIE */
2098                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2099                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2100                         if (ieee80211_is_deauth(fc) ||
2101                             ieee80211_is_disassoc(fc))
2102                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2103                                                              rx->skb->data,
2104                                                              rx->skb->len);
2105                         return -EACCES;
2106                 }
2107                 /*
2108                  * When using MFP, Action frames are not allowed prior to
2109                  * having configured keys.
2110                  */
2111                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2112                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2113                         return -EACCES;
2114         }
2115
2116         return 0;
2117 }
2118
2119 static int
2120 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2121 {
2122         struct ieee80211_sub_if_data *sdata = rx->sdata;
2123         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2124         bool check_port_control = false;
2125         struct ethhdr *ehdr;
2126         int ret;
2127
2128         *port_control = false;
2129         if (ieee80211_has_a4(hdr->frame_control) &&
2130             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2131                 return -1;
2132
2133         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2134             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2135
2136                 if (!sdata->u.mgd.use_4addr)
2137                         return -1;
2138                 else
2139                         check_port_control = true;
2140         }
2141
2142         if (is_multicast_ether_addr(hdr->addr1) &&
2143             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2144                 return -1;
2145
2146         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2147         if (ret < 0)
2148                 return ret;
2149
2150         ehdr = (struct ethhdr *) rx->skb->data;
2151         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2152                 *port_control = true;
2153         else if (check_port_control)
2154                 return -1;
2155
2156         return 0;
2157 }
2158
2159 /*
2160  * requires that rx->skb is a frame with ethernet header
2161  */
2162 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2163 {
2164         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2165                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2166         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2167
2168         /*
2169          * Allow EAPOL frames to us/the PAE group address regardless
2170          * of whether the frame was encrypted or not.
2171          */
2172         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2173             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2174              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2175                 return true;
2176
2177         if (ieee80211_802_1x_port_control(rx) ||
2178             ieee80211_drop_unencrypted(rx, fc))
2179                 return false;
2180
2181         return true;
2182 }
2183
2184 /*
2185  * requires that rx->skb is a frame with ethernet header
2186  */
2187 static void
2188 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2189 {
2190         struct ieee80211_sub_if_data *sdata = rx->sdata;
2191         struct net_device *dev = sdata->dev;
2192         struct sk_buff *skb, *xmit_skb;
2193         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2194         struct sta_info *dsta;
2195
2196         skb = rx->skb;
2197         xmit_skb = NULL;
2198
2199         ieee80211_rx_stats(dev, skb->len);
2200
2201         if (rx->sta) {
2202                 /* The seqno index has the same property as needed
2203                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2204                  * for non-QoS-data frames. Here we know it's a data
2205                  * frame, so count MSDUs.
2206                  */
2207                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2208                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2209                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2210         }
2211
2212         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2213              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2214             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2215             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2216                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2217                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2218                         /*
2219                          * send multicast frames both to higher layers in
2220                          * local net stack and back to the wireless medium
2221                          */
2222                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2223                         if (!xmit_skb)
2224                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2225                                                     dev->name);
2226                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2227                         dsta = sta_info_get(sdata, skb->data);
2228                         if (dsta) {
2229                                 /*
2230                                  * The destination station is associated to
2231                                  * this AP (in this VLAN), so send the frame
2232                                  * directly to it and do not pass it to local
2233                                  * net stack.
2234                                  */
2235                                 xmit_skb = skb;
2236                                 skb = NULL;
2237                         }
2238                 }
2239         }
2240
2241 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2242         if (skb) {
2243                 /* 'align' will only take the values 0 or 2 here since all
2244                  * frames are required to be aligned to 2-byte boundaries
2245                  * when being passed to mac80211; the code here works just
2246                  * as well if that isn't true, but mac80211 assumes it can
2247                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2248                  */
2249                 int align;
2250
2251                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2252                 if (align) {
2253                         if (WARN_ON(skb_headroom(skb) < 3)) {
2254                                 dev_kfree_skb(skb);
2255                                 skb = NULL;
2256                         } else {
2257                                 u8 *data = skb->data;
2258                                 size_t len = skb_headlen(skb);
2259                                 skb->data -= align;
2260                                 memmove(skb->data, data, len);
2261                                 skb_set_tail_pointer(skb, len);
2262                         }
2263                 }
2264         }
2265 #endif
2266
2267         if (skb) {
2268                 /* deliver to local stack */
2269                 skb->protocol = eth_type_trans(skb, dev);
2270                 memset(skb->cb, 0, sizeof(skb->cb));
2271                 if (rx->napi)
2272                         napi_gro_receive(rx->napi, skb);
2273                 else
2274                         netif_receive_skb(skb);
2275         }
2276
2277         if (xmit_skb) {
2278                 /*
2279                  * Send to wireless media and increase priority by 256 to
2280                  * keep the received priority instead of reclassifying
2281                  * the frame (see cfg80211_classify8021d).
2282                  */
2283                 xmit_skb->priority += 256;
2284                 xmit_skb->protocol = htons(ETH_P_802_3);
2285                 skb_reset_network_header(xmit_skb);
2286                 skb_reset_mac_header(xmit_skb);
2287                 dev_queue_xmit(xmit_skb);
2288         }
2289 }
2290
2291 static ieee80211_rx_result debug_noinline
2292 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2293 {
2294         struct net_device *dev = rx->sdata->dev;
2295         struct sk_buff *skb = rx->skb;
2296         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2297         __le16 fc = hdr->frame_control;
2298         struct sk_buff_head frame_list;
2299         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2300         struct ethhdr ethhdr;
2301         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2302
2303         if (unlikely(!ieee80211_is_data(fc)))
2304                 return RX_CONTINUE;
2305
2306         if (unlikely(!ieee80211_is_data_present(fc)))
2307                 return RX_DROP_MONITOR;
2308
2309         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2310                 return RX_CONTINUE;
2311
2312         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2313                 switch (rx->sdata->vif.type) {
2314                 case NL80211_IFTYPE_AP_VLAN:
2315                         if (!rx->sdata->u.vlan.sta)
2316                                 return RX_DROP_UNUSABLE;
2317                         break;
2318                 case NL80211_IFTYPE_STATION:
2319                         if (!rx->sdata->u.mgd.use_4addr)
2320                                 return RX_DROP_UNUSABLE;
2321                         break;
2322                 default:
2323                         return RX_DROP_UNUSABLE;
2324                 }
2325                 check_da = NULL;
2326                 check_sa = NULL;
2327         } else switch (rx->sdata->vif.type) {
2328                 case NL80211_IFTYPE_AP:
2329                 case NL80211_IFTYPE_AP_VLAN:
2330                         check_da = NULL;
2331                         break;
2332                 case NL80211_IFTYPE_STATION:
2333                         if (!rx->sta ||
2334                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2335                                 check_sa = NULL;
2336                         break;
2337                 case NL80211_IFTYPE_MESH_POINT:
2338                         check_sa = NULL;
2339                         break;
2340                 default:
2341                         break;
2342         }
2343
2344         if (is_multicast_ether_addr(hdr->addr1))
2345                 return RX_DROP_UNUSABLE;
2346
2347         skb->dev = dev;
2348         __skb_queue_head_init(&frame_list);
2349
2350         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2351                                           rx->sdata->vif.addr,
2352                                           rx->sdata->vif.type))
2353                 return RX_DROP_UNUSABLE;
2354
2355         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2356                                  rx->sdata->vif.type,
2357                                  rx->local->hw.extra_tx_headroom,
2358                                  check_da, check_sa);
2359
2360         while (!skb_queue_empty(&frame_list)) {
2361                 rx->skb = __skb_dequeue(&frame_list);
2362
2363                 if (!ieee80211_frame_allowed(rx, fc)) {
2364                         dev_kfree_skb(rx->skb);
2365                         continue;
2366                 }
2367
2368                 ieee80211_deliver_skb(rx);
2369         }
2370
2371         return RX_QUEUED;
2372 }
2373
2374 #ifdef CONFIG_MAC80211_MESH
2375 static ieee80211_rx_result
2376 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2377 {
2378         struct ieee80211_hdr *fwd_hdr, *hdr;
2379         struct ieee80211_tx_info *info;
2380         struct ieee80211s_hdr *mesh_hdr;
2381         struct sk_buff *skb = rx->skb, *fwd_skb;
2382         struct ieee80211_local *local = rx->local;
2383         struct ieee80211_sub_if_data *sdata = rx->sdata;
2384         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2385         u16 ac, q, hdrlen;
2386
2387         hdr = (struct ieee80211_hdr *) skb->data;
2388         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2389
2390         /* make sure fixed part of mesh header is there, also checks skb len */
2391         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2392                 return RX_DROP_MONITOR;
2393
2394         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2395
2396         /* make sure full mesh header is there, also checks skb len */
2397         if (!pskb_may_pull(rx->skb,
2398                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2399                 return RX_DROP_MONITOR;
2400
2401         /* reload pointers */
2402         hdr = (struct ieee80211_hdr *) skb->data;
2403         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2404
2405         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2406                 return RX_DROP_MONITOR;
2407
2408         /* frame is in RMC, don't forward */
2409         if (ieee80211_is_data(hdr->frame_control) &&
2410             is_multicast_ether_addr(hdr->addr1) &&
2411             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2412                 return RX_DROP_MONITOR;
2413
2414         if (!ieee80211_is_data(hdr->frame_control))
2415                 return RX_CONTINUE;
2416
2417         if (!mesh_hdr->ttl)
2418                 return RX_DROP_MONITOR;
2419
2420         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2421                 struct mesh_path *mppath;
2422                 char *proxied_addr;
2423                 char *mpp_addr;
2424
2425                 if (is_multicast_ether_addr(hdr->addr1)) {
2426                         mpp_addr = hdr->addr3;
2427                         proxied_addr = mesh_hdr->eaddr1;
2428                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2429                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2430                         mpp_addr = hdr->addr4;
2431                         proxied_addr = mesh_hdr->eaddr2;
2432                 } else {
2433                         return RX_DROP_MONITOR;
2434                 }
2435
2436                 rcu_read_lock();
2437                 mppath = mpp_path_lookup(sdata, proxied_addr);
2438                 if (!mppath) {
2439                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2440                 } else {
2441                         spin_lock_bh(&mppath->state_lock);
2442                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2443                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2444                         mppath->exp_time = jiffies;
2445                         spin_unlock_bh(&mppath->state_lock);
2446                 }
2447                 rcu_read_unlock();
2448         }
2449
2450         /* Frame has reached destination.  Don't forward */
2451         if (!is_multicast_ether_addr(hdr->addr1) &&
2452             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2453                 return RX_CONTINUE;
2454
2455         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2456         q = sdata->vif.hw_queue[ac];
2457         if (ieee80211_queue_stopped(&local->hw, q)) {
2458                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2459                 return RX_DROP_MONITOR;
2460         }
2461         skb_set_queue_mapping(skb, q);
2462
2463         if (!--mesh_hdr->ttl) {
2464                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2465                 goto out;
2466         }
2467
2468         if (!ifmsh->mshcfg.dot11MeshForwarding)
2469                 goto out;
2470
2471         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2472                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2473         if (!fwd_skb) {
2474                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2475                                     sdata->name);
2476                 goto out;
2477         }
2478
2479         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2480         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2481         info = IEEE80211_SKB_CB(fwd_skb);
2482         memset(info, 0, sizeof(*info));
2483         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2484         info->control.vif = &rx->sdata->vif;
2485         info->control.jiffies = jiffies;
2486         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2487                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2488                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2489                 /* update power mode indication when forwarding */
2490                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2491         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2492                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2493                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2494         } else {
2495                 /* unable to resolve next hop */
2496                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2497                                    fwd_hdr->addr3, 0,
2498                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2499                                    fwd_hdr->addr2);
2500                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2501                 kfree_skb(fwd_skb);
2502                 return RX_DROP_MONITOR;
2503         }
2504
2505         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2506         ieee80211_add_pending_skb(local, fwd_skb);
2507  out:
2508         if (is_multicast_ether_addr(hdr->addr1))
2509                 return RX_CONTINUE;
2510         return RX_DROP_MONITOR;
2511 }
2512 #endif
2513
2514 static ieee80211_rx_result debug_noinline
2515 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2516 {
2517         struct ieee80211_sub_if_data *sdata = rx->sdata;
2518         struct ieee80211_local *local = rx->local;
2519         struct net_device *dev = sdata->dev;
2520         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2521         __le16 fc = hdr->frame_control;
2522         bool port_control;
2523         int err;
2524
2525         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2526                 return RX_CONTINUE;
2527
2528         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2529                 return RX_DROP_MONITOR;
2530
2531         /*
2532          * Send unexpected-4addr-frame event to hostapd. For older versions,
2533          * also drop the frame to cooked monitor interfaces.
2534          */
2535         if (ieee80211_has_a4(hdr->frame_control) &&
2536             sdata->vif.type == NL80211_IFTYPE_AP) {
2537                 if (rx->sta &&
2538                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2539                         cfg80211_rx_unexpected_4addr_frame(
2540                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2541                 return RX_DROP_MONITOR;
2542         }
2543
2544         err = __ieee80211_data_to_8023(rx, &port_control);
2545         if (unlikely(err))
2546                 return RX_DROP_UNUSABLE;
2547
2548         if (!ieee80211_frame_allowed(rx, fc))
2549                 return RX_DROP_MONITOR;
2550
2551         /* directly handle TDLS channel switch requests/responses */
2552         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2553                                                 cpu_to_be16(ETH_P_TDLS))) {
2554                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2555
2556                 if (pskb_may_pull(rx->skb,
2557                                   offsetof(struct ieee80211_tdls_data, u)) &&
2558                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2559                     tf->category == WLAN_CATEGORY_TDLS &&
2560                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2561                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2562                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2563                         schedule_work(&local->tdls_chsw_work);
2564                         if (rx->sta)
2565                                 rx->sta->rx_stats.packets++;
2566
2567                         return RX_QUEUED;
2568                 }
2569         }
2570
2571         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2572             unlikely(port_control) && sdata->bss) {
2573                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2574                                      u.ap);
2575                 dev = sdata->dev;
2576                 rx->sdata = sdata;
2577         }
2578
2579         rx->skb->dev = dev;
2580
2581         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2582             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2583             !is_multicast_ether_addr(
2584                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2585             (!local->scanning &&
2586              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2587                 mod_timer(&local->dynamic_ps_timer, jiffies +
2588                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2589
2590         ieee80211_deliver_skb(rx);
2591
2592         return RX_QUEUED;
2593 }
2594
2595 static ieee80211_rx_result debug_noinline
2596 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2597 {
2598         struct sk_buff *skb = rx->skb;
2599         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2600         struct tid_ampdu_rx *tid_agg_rx;
2601         u16 start_seq_num;
2602         u16 tid;
2603
2604         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2605                 return RX_CONTINUE;
2606
2607         if (ieee80211_is_back_req(bar->frame_control)) {
2608                 struct {
2609                         __le16 control, start_seq_num;
2610                 } __packed bar_data;
2611                 struct ieee80211_event event = {
2612                         .type = BAR_RX_EVENT,
2613                 };
2614
2615                 if (!rx->sta)
2616                         return RX_DROP_MONITOR;
2617
2618                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2619                                   &bar_data, sizeof(bar_data)))
2620                         return RX_DROP_MONITOR;
2621
2622                 tid = le16_to_cpu(bar_data.control) >> 12;
2623
2624                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2625                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2626                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2627                                              WLAN_BACK_RECIPIENT,
2628                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2629
2630                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2631                 if (!tid_agg_rx)
2632                         return RX_DROP_MONITOR;
2633
2634                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2635                 event.u.ba.tid = tid;
2636                 event.u.ba.ssn = start_seq_num;
2637                 event.u.ba.sta = &rx->sta->sta;
2638
2639                 /* reset session timer */
2640                 if (tid_agg_rx->timeout)
2641                         mod_timer(&tid_agg_rx->session_timer,
2642                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2643
2644                 spin_lock(&tid_agg_rx->reorder_lock);
2645                 /* release stored frames up to start of BAR */
2646                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2647                                                  start_seq_num, frames);
2648                 spin_unlock(&tid_agg_rx->reorder_lock);
2649
2650                 drv_event_callback(rx->local, rx->sdata, &event);
2651
2652                 kfree_skb(skb);
2653                 return RX_QUEUED;
2654         }
2655
2656         /*
2657          * After this point, we only want management frames,
2658          * so we can drop all remaining control frames to
2659          * cooked monitor interfaces.
2660          */
2661         return RX_DROP_MONITOR;
2662 }
2663
2664 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2665                                            struct ieee80211_mgmt *mgmt,
2666                                            size_t len)
2667 {
2668         struct ieee80211_local *local = sdata->local;
2669         struct sk_buff *skb;
2670         struct ieee80211_mgmt *resp;
2671
2672         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2673                 /* Not to own unicast address */
2674                 return;
2675         }
2676
2677         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2678             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2679                 /* Not from the current AP or not associated yet. */
2680                 return;
2681         }
2682
2683         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2684                 /* Too short SA Query request frame */
2685                 return;
2686         }
2687
2688         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2689         if (skb == NULL)
2690                 return;
2691
2692         skb_reserve(skb, local->hw.extra_tx_headroom);
2693         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2694         memset(resp, 0, 24);
2695         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2696         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2697         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2698         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2699                                           IEEE80211_STYPE_ACTION);
2700         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2701         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2702         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2703         memcpy(resp->u.action.u.sa_query.trans_id,
2704                mgmt->u.action.u.sa_query.trans_id,
2705                WLAN_SA_QUERY_TR_ID_LEN);
2706
2707         ieee80211_tx_skb(sdata, skb);
2708 }
2709
2710 static ieee80211_rx_result debug_noinline
2711 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2712 {
2713         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2714         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2715
2716         /*
2717          * From here on, look only at management frames.
2718          * Data and control frames are already handled,
2719          * and unknown (reserved) frames are useless.
2720          */
2721         if (rx->skb->len < 24)
2722                 return RX_DROP_MONITOR;
2723
2724         if (!ieee80211_is_mgmt(mgmt->frame_control))
2725                 return RX_DROP_MONITOR;
2726
2727         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2728             ieee80211_is_beacon(mgmt->frame_control) &&
2729             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2730                 int sig = 0;
2731
2732                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2733                         sig = status->signal;
2734
2735                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2736                                             rx->skb->data, rx->skb->len,
2737                                             status->freq, sig);
2738                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2739         }
2740
2741         if (ieee80211_drop_unencrypted_mgmt(rx))
2742                 return RX_DROP_UNUSABLE;
2743
2744         return RX_CONTINUE;
2745 }
2746
2747 static ieee80211_rx_result debug_noinline
2748 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2749 {
2750         struct ieee80211_local *local = rx->local;
2751         struct ieee80211_sub_if_data *sdata = rx->sdata;
2752         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2753         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2754         int len = rx->skb->len;
2755
2756         if (!ieee80211_is_action(mgmt->frame_control))
2757                 return RX_CONTINUE;
2758
2759         /* drop too small frames */
2760         if (len < IEEE80211_MIN_ACTION_SIZE)
2761                 return RX_DROP_UNUSABLE;
2762
2763         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2764             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2765             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2766                 return RX_DROP_UNUSABLE;
2767
2768         switch (mgmt->u.action.category) {
2769         case WLAN_CATEGORY_HT:
2770                 /* reject HT action frames from stations not supporting HT */
2771                 if (!rx->sta->sta.ht_cap.ht_supported)
2772                         goto invalid;
2773
2774                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2775                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2776                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2777                     sdata->vif.type != NL80211_IFTYPE_AP &&
2778                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2779                         break;
2780
2781                 /* verify action & smps_control/chanwidth are present */
2782                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2783                         goto invalid;
2784
2785                 switch (mgmt->u.action.u.ht_smps.action) {
2786                 case WLAN_HT_ACTION_SMPS: {
2787                         struct ieee80211_supported_band *sband;
2788                         enum ieee80211_smps_mode smps_mode;
2789
2790                         /* convert to HT capability */
2791                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2792                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2793                                 smps_mode = IEEE80211_SMPS_OFF;
2794                                 break;
2795                         case WLAN_HT_SMPS_CONTROL_STATIC:
2796                                 smps_mode = IEEE80211_SMPS_STATIC;
2797                                 break;
2798                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2799                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2800                                 break;
2801                         default:
2802                                 goto invalid;
2803                         }
2804
2805                         /* if no change do nothing */
2806                         if (rx->sta->sta.smps_mode == smps_mode)
2807                                 goto handled;
2808                         rx->sta->sta.smps_mode = smps_mode;
2809
2810                         sband = rx->local->hw.wiphy->bands[status->band];
2811
2812                         rate_control_rate_update(local, sband, rx->sta,
2813                                                  IEEE80211_RC_SMPS_CHANGED);
2814                         goto handled;
2815                 }
2816                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2817                         struct ieee80211_supported_band *sband;
2818                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2819                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2820
2821                         /* If it doesn't support 40 MHz it can't change ... */
2822                         if (!(rx->sta->sta.ht_cap.cap &
2823                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2824                                 goto handled;
2825
2826                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2827                                 max_bw = IEEE80211_STA_RX_BW_20;
2828                         else
2829                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2830
2831                         /* set cur_max_bandwidth and recalc sta bw */
2832                         rx->sta->cur_max_bandwidth = max_bw;
2833                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2834
2835                         if (rx->sta->sta.bandwidth == new_bw)
2836                                 goto handled;
2837
2838                         rx->sta->sta.bandwidth = new_bw;
2839                         sband = rx->local->hw.wiphy->bands[status->band];
2840
2841                         rate_control_rate_update(local, sband, rx->sta,
2842                                                  IEEE80211_RC_BW_CHANGED);
2843                         goto handled;
2844                 }
2845                 default:
2846                         goto invalid;
2847                 }
2848
2849                 break;
2850         case WLAN_CATEGORY_PUBLIC:
2851                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2852                         goto invalid;
2853                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2854                         break;
2855                 if (!rx->sta)
2856                         break;
2857                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2858                         break;
2859                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2860                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2861                         break;
2862                 if (len < offsetof(struct ieee80211_mgmt,
2863                                    u.action.u.ext_chan_switch.variable))
2864                         goto invalid;
2865                 goto queue;
2866         case WLAN_CATEGORY_VHT:
2867                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2868                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2869                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2870                     sdata->vif.type != NL80211_IFTYPE_AP &&
2871                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2872                         break;
2873
2874                 /* verify action code is present */
2875                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2876                         goto invalid;
2877
2878                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2879                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2880                         /* verify opmode is present */
2881                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2882                                 goto invalid;
2883                         goto queue;
2884                 }
2885                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2886                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2887                                 goto invalid;
2888                         goto queue;
2889                 }
2890                 default:
2891                         break;
2892                 }
2893                 break;
2894         case WLAN_CATEGORY_BACK:
2895                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2896                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2897                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2898                     sdata->vif.type != NL80211_IFTYPE_AP &&
2899                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2900                         break;
2901
2902                 /* verify action_code is present */
2903                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2904                         break;
2905
2906                 switch (mgmt->u.action.u.addba_req.action_code) {
2907                 case WLAN_ACTION_ADDBA_REQ:
2908                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2909                                    sizeof(mgmt->u.action.u.addba_req)))
2910                                 goto invalid;
2911                         break;
2912                 case WLAN_ACTION_ADDBA_RESP:
2913                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2914                                    sizeof(mgmt->u.action.u.addba_resp)))
2915                                 goto invalid;
2916                         break;
2917                 case WLAN_ACTION_DELBA:
2918                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2919                                    sizeof(mgmt->u.action.u.delba)))
2920                                 goto invalid;
2921                         break;
2922                 default:
2923                         goto invalid;
2924                 }
2925
2926                 goto queue;
2927         case WLAN_CATEGORY_SPECTRUM_MGMT:
2928                 /* verify action_code is present */
2929                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2930                         break;
2931
2932                 switch (mgmt->u.action.u.measurement.action_code) {
2933                 case WLAN_ACTION_SPCT_MSR_REQ:
2934                         if (status->band != NL80211_BAND_5GHZ)
2935                                 break;
2936
2937                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2938                                    sizeof(mgmt->u.action.u.measurement)))
2939                                 break;
2940
2941                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2942                                 break;
2943
2944                         ieee80211_process_measurement_req(sdata, mgmt, len);
2945                         goto handled;
2946                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2947                         u8 *bssid;
2948                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2949                                    sizeof(mgmt->u.action.u.chan_switch)))
2950                                 break;
2951
2952                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2953                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2954                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2955                                 break;
2956
2957                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2958                                 bssid = sdata->u.mgd.bssid;
2959                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2960                                 bssid = sdata->u.ibss.bssid;
2961                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2962                                 bssid = mgmt->sa;
2963                         else
2964                                 break;
2965
2966                         if (!ether_addr_equal(mgmt->bssid, bssid))
2967                                 break;
2968
2969                         goto queue;
2970                         }
2971                 }
2972                 break;
2973         case WLAN_CATEGORY_SA_QUERY:
2974                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2975                            sizeof(mgmt->u.action.u.sa_query)))
2976                         break;
2977
2978                 switch (mgmt->u.action.u.sa_query.action) {
2979                 case WLAN_ACTION_SA_QUERY_REQUEST:
2980                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2981                                 break;
2982                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2983                         goto handled;
2984                 }
2985                 break;
2986         case WLAN_CATEGORY_SELF_PROTECTED:
2987                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2988                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2989                         break;
2990
2991                 switch (mgmt->u.action.u.self_prot.action_code) {
2992                 case WLAN_SP_MESH_PEERING_OPEN:
2993                 case WLAN_SP_MESH_PEERING_CLOSE:
2994                 case WLAN_SP_MESH_PEERING_CONFIRM:
2995                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2996                                 goto invalid;
2997                         if (sdata->u.mesh.user_mpm)
2998                                 /* userspace handles this frame */
2999                                 break;
3000                         goto queue;
3001                 case WLAN_SP_MGK_INFORM:
3002                 case WLAN_SP_MGK_ACK:
3003                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3004                                 goto invalid;
3005                         break;
3006                 }
3007                 break;
3008         case WLAN_CATEGORY_MESH_ACTION:
3009                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3010                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3011                         break;
3012
3013                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3014                         break;
3015                 if (mesh_action_is_path_sel(mgmt) &&
3016                     !mesh_path_sel_is_hwmp(sdata))
3017                         break;
3018                 goto queue;
3019         }
3020
3021         return RX_CONTINUE;
3022
3023  invalid:
3024         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3025         /* will return in the next handlers */
3026         return RX_CONTINUE;
3027
3028  handled:
3029         if (rx->sta)
3030                 rx->sta->rx_stats.packets++;
3031         dev_kfree_skb(rx->skb);
3032         return RX_QUEUED;
3033
3034  queue:
3035         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3036         skb_queue_tail(&sdata->skb_queue, rx->skb);
3037         ieee80211_queue_work(&local->hw, &sdata->work);
3038         if (rx->sta)
3039                 rx->sta->rx_stats.packets++;
3040         return RX_QUEUED;
3041 }
3042
3043 static ieee80211_rx_result debug_noinline
3044 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3045 {
3046         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3047         int sig = 0;
3048
3049         /* skip known-bad action frames and return them in the next handler */
3050         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3051                 return RX_CONTINUE;
3052
3053         /*
3054          * Getting here means the kernel doesn't know how to handle
3055          * it, but maybe userspace does ... include returned frames
3056          * so userspace can register for those to know whether ones
3057          * it transmitted were processed or returned.
3058          */
3059
3060         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3061                 sig = status->signal;
3062
3063         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3064                              rx->skb->data, rx->skb->len, 0)) {
3065                 if (rx->sta)
3066                         rx->sta->rx_stats.packets++;
3067                 dev_kfree_skb(rx->skb);
3068                 return RX_QUEUED;
3069         }
3070
3071         return RX_CONTINUE;
3072 }
3073
3074 static ieee80211_rx_result debug_noinline
3075 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3076 {
3077         struct ieee80211_local *local = rx->local;
3078         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3079         struct sk_buff *nskb;
3080         struct ieee80211_sub_if_data *sdata = rx->sdata;
3081         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3082
3083         if (!ieee80211_is_action(mgmt->frame_control))
3084                 return RX_CONTINUE;
3085
3086         /*
3087          * For AP mode, hostapd is responsible for handling any action
3088          * frames that we didn't handle, including returning unknown
3089          * ones. For all other modes we will return them to the sender,
3090          * setting the 0x80 bit in the action category, as required by
3091          * 802.11-2012 9.24.4.
3092          * Newer versions of hostapd shall also use the management frame
3093          * registration mechanisms, but older ones still use cooked
3094          * monitor interfaces so push all frames there.
3095          */
3096         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3097             (sdata->vif.type == NL80211_IFTYPE_AP ||
3098              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3099                 return RX_DROP_MONITOR;
3100
3101         if (is_multicast_ether_addr(mgmt->da))
3102                 return RX_DROP_MONITOR;
3103
3104         /* do not return rejected action frames */
3105         if (mgmt->u.action.category & 0x80)
3106                 return RX_DROP_UNUSABLE;
3107
3108         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3109                                GFP_ATOMIC);
3110         if (nskb) {
3111                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3112
3113                 nmgmt->u.action.category |= 0x80;
3114                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3115                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3116
3117                 memset(nskb->cb, 0, sizeof(nskb->cb));
3118
3119                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3120                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3121
3122                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3123                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3124                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3125                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3126                                 info->hw_queue =
3127                                         local->hw.offchannel_tx_hw_queue;
3128                 }
3129
3130                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3131                                             status->band);
3132         }
3133         dev_kfree_skb(rx->skb);
3134         return RX_QUEUED;
3135 }
3136
3137 static ieee80211_rx_result debug_noinline
3138 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3139 {
3140         struct ieee80211_sub_if_data *sdata = rx->sdata;
3141         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3142         __le16 stype;
3143
3144         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3145
3146         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3147             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3148             sdata->vif.type != NL80211_IFTYPE_OCB &&
3149             sdata->vif.type != NL80211_IFTYPE_STATION)
3150                 return RX_DROP_MONITOR;
3151
3152         switch (stype) {
3153         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3154         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3155         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3156                 /* process for all: mesh, mlme, ibss */
3157                 break;
3158         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3159         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3160         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3161         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3162                 if (is_multicast_ether_addr(mgmt->da) &&
3163                     !is_broadcast_ether_addr(mgmt->da))
3164                         return RX_DROP_MONITOR;
3165
3166                 /* process only for station */
3167                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3168                         return RX_DROP_MONITOR;
3169                 break;
3170         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3171                 /* process only for ibss and mesh */
3172                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3173                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3174                         return RX_DROP_MONITOR;
3175                 break;
3176         default:
3177                 return RX_DROP_MONITOR;
3178         }
3179
3180         /* queue up frame and kick off work to process it */
3181         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3182         skb_queue_tail(&sdata->skb_queue, rx->skb);
3183         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3184         if (rx->sta)
3185                 rx->sta->rx_stats.packets++;
3186
3187         return RX_QUEUED;
3188 }
3189
3190 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3191                                         struct ieee80211_rate *rate)
3192 {
3193         struct ieee80211_sub_if_data *sdata;
3194         struct ieee80211_local *local = rx->local;
3195         struct sk_buff *skb = rx->skb, *skb2;
3196         struct net_device *prev_dev = NULL;
3197         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3198         int needed_headroom;
3199
3200         /*
3201          * If cooked monitor has been processed already, then
3202          * don't do it again. If not, set the flag.
3203          */
3204         if (rx->flags & IEEE80211_RX_CMNTR)
3205                 goto out_free_skb;
3206         rx->flags |= IEEE80211_RX_CMNTR;
3207
3208         /* If there are no cooked monitor interfaces, just free the SKB */
3209         if (!local->cooked_mntrs)
3210                 goto out_free_skb;
3211
3212         /* vendor data is long removed here */
3213         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3214         /* room for the radiotap header based on driver features */
3215         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3216
3217         if (skb_headroom(skb) < needed_headroom &&
3218             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3219                 goto out_free_skb;
3220
3221         /* prepend radiotap information */
3222         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3223                                          false);
3224
3225         skb_reset_mac_header(skb);
3226         skb->ip_summed = CHECKSUM_UNNECESSARY;
3227         skb->pkt_type = PACKET_OTHERHOST;
3228         skb->protocol = htons(ETH_P_802_2);
3229
3230         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3231                 if (!ieee80211_sdata_running(sdata))
3232                         continue;
3233
3234                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3235                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3236                         continue;
3237
3238                 if (prev_dev) {
3239                         skb2 = skb_clone(skb, GFP_ATOMIC);
3240                         if (skb2) {
3241                                 skb2->dev = prev_dev;
3242                                 netif_receive_skb(skb2);
3243                         }
3244                 }
3245
3246                 prev_dev = sdata->dev;
3247                 ieee80211_rx_stats(sdata->dev, skb->len);
3248         }
3249
3250         if (prev_dev) {
3251                 skb->dev = prev_dev;
3252                 netif_receive_skb(skb);
3253                 return;
3254         }
3255
3256  out_free_skb:
3257         dev_kfree_skb(skb);
3258 }
3259
3260 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3261                                          ieee80211_rx_result res)
3262 {
3263         switch (res) {
3264         case RX_DROP_MONITOR:
3265                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3266                 if (rx->sta)
3267                         rx->sta->rx_stats.dropped++;
3268                 /* fall through */
3269         case RX_CONTINUE: {
3270                 struct ieee80211_rate *rate = NULL;
3271                 struct ieee80211_supported_band *sband;
3272                 struct ieee80211_rx_status *status;
3273
3274                 status = IEEE80211_SKB_RXCB((rx->skb));
3275
3276                 sband = rx->local->hw.wiphy->bands[status->band];
3277                 if (!(status->flag & RX_FLAG_HT) &&
3278                     !(status->flag & RX_FLAG_VHT))
3279                         rate = &sband->bitrates[status->rate_idx];
3280
3281                 ieee80211_rx_cooked_monitor(rx, rate);
3282                 break;
3283                 }
3284         case RX_DROP_UNUSABLE:
3285                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3286                 if (rx->sta)
3287                         rx->sta->rx_stats.dropped++;
3288                 dev_kfree_skb(rx->skb);
3289                 break;
3290         case RX_QUEUED:
3291                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3292                 break;
3293         }
3294 }
3295
3296 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3297                                   struct sk_buff_head *frames)
3298 {
3299         ieee80211_rx_result res = RX_DROP_MONITOR;
3300         struct sk_buff *skb;
3301
3302 #define CALL_RXH(rxh)                   \
3303         do {                            \
3304                 res = rxh(rx);          \
3305                 if (res != RX_CONTINUE) \
3306                         goto rxh_next;  \
3307         } while (0)
3308
3309         /* Lock here to avoid hitting all of the data used in the RX
3310          * path (e.g. key data, station data, ...) concurrently when
3311          * a frame is released from the reorder buffer due to timeout
3312          * from the timer, potentially concurrently with RX from the
3313          * driver.
3314          */
3315         spin_lock_bh(&rx->local->rx_path_lock);
3316
3317         while ((skb = __skb_dequeue(frames))) {
3318                 /*
3319                  * all the other fields are valid across frames
3320                  * that belong to an aMPDU since they are on the
3321                  * same TID from the same station
3322                  */
3323                 rx->skb = skb;
3324
3325                 CALL_RXH(ieee80211_rx_h_check_more_data);
3326                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3327                 CALL_RXH(ieee80211_rx_h_sta_process);
3328                 CALL_RXH(ieee80211_rx_h_decrypt);
3329                 CALL_RXH(ieee80211_rx_h_defragment);
3330                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3331                 /* must be after MMIC verify so header is counted in MPDU mic */
3332 #ifdef CONFIG_MAC80211_MESH
3333                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3334                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3335 #endif
3336                 CALL_RXH(ieee80211_rx_h_amsdu);
3337                 CALL_RXH(ieee80211_rx_h_data);
3338
3339                 /* special treatment -- needs the queue */
3340                 res = ieee80211_rx_h_ctrl(rx, frames);
3341                 if (res != RX_CONTINUE)
3342                         goto rxh_next;
3343
3344                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3345                 CALL_RXH(ieee80211_rx_h_action);
3346                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3347                 CALL_RXH(ieee80211_rx_h_action_return);
3348                 CALL_RXH(ieee80211_rx_h_mgmt);
3349
3350  rxh_next:
3351                 ieee80211_rx_handlers_result(rx, res);
3352
3353 #undef CALL_RXH
3354         }
3355
3356         spin_unlock_bh(&rx->local->rx_path_lock);
3357 }
3358
3359 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3360 {
3361         struct sk_buff_head reorder_release;
3362         ieee80211_rx_result res = RX_DROP_MONITOR;
3363
3364         __skb_queue_head_init(&reorder_release);
3365
3366 #define CALL_RXH(rxh)                   \
3367         do {                            \
3368                 res = rxh(rx);          \
3369                 if (res != RX_CONTINUE) \
3370                         goto rxh_next;  \
3371         } while (0)
3372
3373         CALL_RXH(ieee80211_rx_h_check_dup);
3374         CALL_RXH(ieee80211_rx_h_check);
3375
3376         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3377
3378         ieee80211_rx_handlers(rx, &reorder_release);
3379         return;
3380
3381  rxh_next:
3382         ieee80211_rx_handlers_result(rx, res);
3383
3384 #undef CALL_RXH
3385 }
3386
3387 /*
3388  * This function makes calls into the RX path, therefore
3389  * it has to be invoked under RCU read lock.
3390  */
3391 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3392 {
3393         struct sk_buff_head frames;
3394         struct ieee80211_rx_data rx = {
3395                 .sta = sta,
3396                 .sdata = sta->sdata,
3397                 .local = sta->local,
3398                 /* This is OK -- must be QoS data frame */
3399                 .security_idx = tid,
3400                 .seqno_idx = tid,
3401                 .napi = NULL, /* must be NULL to not have races */
3402         };
3403         struct tid_ampdu_rx *tid_agg_rx;
3404
3405         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3406         if (!tid_agg_rx)
3407                 return;
3408
3409         __skb_queue_head_init(&frames);
3410
3411         spin_lock(&tid_agg_rx->reorder_lock);
3412         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3413         spin_unlock(&tid_agg_rx->reorder_lock);
3414
3415         if (!skb_queue_empty(&frames)) {
3416                 struct ieee80211_event event = {
3417                         .type = BA_FRAME_TIMEOUT,
3418                         .u.ba.tid = tid,
3419                         .u.ba.sta = &sta->sta,
3420                 };
3421                 drv_event_callback(rx.local, rx.sdata, &event);
3422         }
3423
3424         ieee80211_rx_handlers(&rx, &frames);
3425 }
3426
3427 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3428                                           u16 ssn, u64 filtered,
3429                                           u16 received_mpdus)
3430 {
3431         struct sta_info *sta;
3432         struct tid_ampdu_rx *tid_agg_rx;
3433         struct sk_buff_head frames;
3434         struct ieee80211_rx_data rx = {
3435                 /* This is OK -- must be QoS data frame */
3436                 .security_idx = tid,
3437                 .seqno_idx = tid,
3438         };
3439         int i, diff;
3440
3441         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3442                 return;
3443
3444         __skb_queue_head_init(&frames);
3445
3446         sta = container_of(pubsta, struct sta_info, sta);
3447
3448         rx.sta = sta;
3449         rx.sdata = sta->sdata;
3450         rx.local = sta->local;
3451
3452         rcu_read_lock();
3453         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3454         if (!tid_agg_rx)
3455                 goto out;
3456
3457         spin_lock_bh(&tid_agg_rx->reorder_lock);
3458
3459         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3460                 int release;
3461
3462                 /* release all frames in the reorder buffer */
3463                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3464                            IEEE80211_SN_MODULO;
3465                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3466                                                  release, &frames);
3467                 /* update ssn to match received ssn */
3468                 tid_agg_rx->head_seq_num = ssn;
3469         } else {
3470                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3471                                                  &frames);
3472         }
3473
3474         /* handle the case that received ssn is behind the mac ssn.
3475          * it can be tid_agg_rx->buf_size behind and still be valid */
3476         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3477         if (diff >= tid_agg_rx->buf_size) {
3478                 tid_agg_rx->reorder_buf_filtered = 0;
3479                 goto release;
3480         }
3481         filtered = filtered >> diff;
3482         ssn += diff;
3483
3484         /* update bitmap */
3485         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3486                 int index = (ssn + i) % tid_agg_rx->buf_size;
3487
3488                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3489                 if (filtered & BIT_ULL(i))
3490                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3491         }
3492
3493         /* now process also frames that the filter marking released */
3494         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3495
3496 release:
3497         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3498
3499         ieee80211_rx_handlers(&rx, &frames);
3500
3501  out:
3502         rcu_read_unlock();
3503 }
3504 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3505
3506 /* main receive path */
3507
3508 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3509 {
3510         struct ieee80211_sub_if_data *sdata = rx->sdata;
3511         struct sk_buff *skb = rx->skb;
3512         struct ieee80211_hdr *hdr = (void *)skb->data;
3513         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3514         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3515         int multicast = is_multicast_ether_addr(hdr->addr1);
3516
3517         switch (sdata->vif.type) {
3518         case NL80211_IFTYPE_STATION:
3519                 if (!bssid && !sdata->u.mgd.use_4addr)
3520                         return false;
3521                 if (multicast)
3522                         return true;
3523                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3524         case NL80211_IFTYPE_ADHOC:
3525                 if (!bssid)
3526                         return false;
3527                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3528                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3529                         return false;
3530                 if (ieee80211_is_beacon(hdr->frame_control))
3531                         return true;
3532                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3533                         return false;
3534                 if (!multicast &&
3535                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3536                         return false;
3537                 if (!rx->sta) {
3538                         int rate_idx;
3539                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3540                                 rate_idx = 0; /* TODO: HT/VHT rates */
3541                         else
3542                                 rate_idx = status->rate_idx;
3543                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3544                                                  BIT(rate_idx));
3545                 }
3546                 return true;
3547         case NL80211_IFTYPE_OCB:
3548                 if (!bssid)
3549                         return false;
3550                 if (!ieee80211_is_data_present(hdr->frame_control))
3551                         return false;
3552                 if (!is_broadcast_ether_addr(bssid))
3553                         return false;
3554                 if (!multicast &&
3555                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3556                         return false;
3557                 if (!rx->sta) {
3558                         int rate_idx;
3559                         if (status->flag & RX_FLAG_HT)
3560                                 rate_idx = 0; /* TODO: HT rates */
3561                         else
3562                                 rate_idx = status->rate_idx;
3563                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3564                                                 BIT(rate_idx));
3565                 }
3566                 return true;
3567         case NL80211_IFTYPE_MESH_POINT:
3568                 if (multicast)
3569                         return true;
3570                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3571         case NL80211_IFTYPE_AP_VLAN:
3572         case NL80211_IFTYPE_AP:
3573                 if (!bssid)
3574                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3575
3576                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3577                         /*
3578                          * Accept public action frames even when the
3579                          * BSSID doesn't match, this is used for P2P
3580                          * and location updates. Note that mac80211
3581                          * itself never looks at these frames.
3582                          */
3583                         if (!multicast &&
3584                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3585                                 return false;
3586                         if (ieee80211_is_public_action(hdr, skb->len))
3587                                 return true;
3588                         return ieee80211_is_beacon(hdr->frame_control);
3589                 }
3590
3591                 if (!ieee80211_has_tods(hdr->frame_control)) {
3592                         /* ignore data frames to TDLS-peers */
3593                         if (ieee80211_is_data(hdr->frame_control))
3594                                 return false;
3595                         /* ignore action frames to TDLS-peers */
3596                         if (ieee80211_is_action(hdr->frame_control) &&
3597                             !is_broadcast_ether_addr(bssid) &&
3598                             !ether_addr_equal(bssid, hdr->addr1))
3599                                 return false;
3600                 }
3601                 return true;
3602         case NL80211_IFTYPE_WDS:
3603                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3604                         return false;
3605                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3606         case NL80211_IFTYPE_P2P_DEVICE:
3607                 return ieee80211_is_public_action(hdr, skb->len) ||
3608                        ieee80211_is_probe_req(hdr->frame_control) ||
3609                        ieee80211_is_probe_resp(hdr->frame_control) ||
3610                        ieee80211_is_beacon(hdr->frame_control);
3611         case NL80211_IFTYPE_NAN:
3612                 /* Currently no frames on NAN interface are allowed */
3613                 return false;
3614         default:
3615                 break;
3616         }
3617
3618         WARN_ON_ONCE(1);
3619         return false;
3620 }
3621
3622 void ieee80211_check_fast_rx(struct sta_info *sta)
3623 {
3624         struct ieee80211_sub_if_data *sdata = sta->sdata;
3625         struct ieee80211_local *local = sdata->local;
3626         struct ieee80211_key *key;
3627         struct ieee80211_fast_rx fastrx = {
3628                 .dev = sdata->dev,
3629                 .vif_type = sdata->vif.type,
3630                 .control_port_protocol = sdata->control_port_protocol,
3631         }, *old, *new = NULL;
3632         bool assign = false;
3633
3634         /* use sparse to check that we don't return without updating */
3635         __acquire(check_fast_rx);
3636
3637         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3638         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3639         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3640         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3641
3642         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3643
3644         /* fast-rx doesn't do reordering */
3645         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3646             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3647                 goto clear;
3648
3649         switch (sdata->vif.type) {
3650         case NL80211_IFTYPE_STATION:
3651                 /* 4-addr is harder to deal with, later maybe */
3652                 if (sdata->u.mgd.use_4addr)
3653                         goto clear;
3654                 /* software powersave is a huge mess, avoid all of it */
3655                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3656                         goto clear;
3657                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3658                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3659                         goto clear;
3660                 if (sta->sta.tdls) {
3661                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3662                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3663                         fastrx.expected_ds_bits = 0;
3664                 } else {
3665                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3666                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3667                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3668                         fastrx.expected_ds_bits =
3669                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3670                 }
3671                 break;
3672         case NL80211_IFTYPE_AP_VLAN:
3673         case NL80211_IFTYPE_AP:
3674                 /* parallel-rx requires this, at least with calls to
3675                  * ieee80211_sta_ps_transition()
3676                  */
3677                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3678                         goto clear;
3679                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3680                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3681                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3682
3683                 fastrx.internal_forward =
3684                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3685                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3686                          !sdata->u.vlan.sta);
3687                 break;
3688         default:
3689                 goto clear;
3690         }
3691
3692         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3693                 goto clear;
3694
3695         rcu_read_lock();
3696         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3697         if (key) {
3698                 switch (key->conf.cipher) {
3699                 case WLAN_CIPHER_SUITE_TKIP:
3700                         /* we don't want to deal with MMIC in fast-rx */
3701                         goto clear_rcu;
3702                 case WLAN_CIPHER_SUITE_CCMP:
3703                 case WLAN_CIPHER_SUITE_CCMP_256:
3704                 case WLAN_CIPHER_SUITE_GCMP:
3705                 case WLAN_CIPHER_SUITE_GCMP_256:
3706                         break;
3707                 default:
3708                         /* we also don't want to deal with WEP or cipher scheme
3709                          * since those require looking up the key idx in the
3710                          * frame, rather than assuming the PTK is used
3711                          * (we need to revisit this once we implement the real
3712                          * PTK index, which is now valid in the spec, but we
3713                          * haven't implemented that part yet)
3714                          */
3715                         goto clear_rcu;
3716                 }
3717
3718                 fastrx.key = true;
3719                 fastrx.icv_len = key->conf.icv_len;
3720         }
3721
3722         assign = true;
3723  clear_rcu:
3724         rcu_read_unlock();
3725  clear:
3726         __release(check_fast_rx);
3727
3728         if (assign)
3729                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3730
3731         spin_lock_bh(&sta->lock);
3732         old = rcu_dereference_protected(sta->fast_rx, true);
3733         rcu_assign_pointer(sta->fast_rx, new);
3734         spin_unlock_bh(&sta->lock);
3735
3736         if (old)
3737                 kfree_rcu(old, rcu_head);
3738 }
3739
3740 void ieee80211_clear_fast_rx(struct sta_info *sta)
3741 {
3742         struct ieee80211_fast_rx *old;
3743
3744         spin_lock_bh(&sta->lock);
3745         old = rcu_dereference_protected(sta->fast_rx, true);
3746         RCU_INIT_POINTER(sta->fast_rx, NULL);
3747         spin_unlock_bh(&sta->lock);
3748
3749         if (old)
3750                 kfree_rcu(old, rcu_head);
3751 }
3752
3753 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3754 {
3755         struct ieee80211_local *local = sdata->local;
3756         struct sta_info *sta;
3757
3758         lockdep_assert_held(&local->sta_mtx);
3759
3760         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3761                 if (sdata != sta->sdata &&
3762                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3763                         continue;
3764                 ieee80211_check_fast_rx(sta);
3765         }
3766 }
3767
3768 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3769 {
3770         struct ieee80211_local *local = sdata->local;
3771
3772         mutex_lock(&local->sta_mtx);
3773         __ieee80211_check_fast_rx_iface(sdata);
3774         mutex_unlock(&local->sta_mtx);
3775 }
3776
3777 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3778                                      struct ieee80211_fast_rx *fast_rx)
3779 {
3780         struct sk_buff *skb = rx->skb;
3781         struct ieee80211_hdr *hdr = (void *)skb->data;
3782         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3783         struct sta_info *sta = rx->sta;
3784         int orig_len = skb->len;
3785         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3786         struct {
3787                 u8 snap[sizeof(rfc1042_header)];
3788                 __be16 proto;
3789         } *payload __aligned(2);
3790         struct {
3791                 u8 da[ETH_ALEN];
3792                 u8 sa[ETH_ALEN];
3793         } addrs __aligned(2);
3794         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3795
3796         if (fast_rx->uses_rss)
3797                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3798
3799         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3800          * to a common data structure; drivers can implement that per queue
3801          * but we don't have that information in mac80211
3802          */
3803         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3804                 return false;
3805
3806 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3807
3808         /* If using encryption, we also need to have:
3809          *  - PN_VALIDATED: similar, but the implementation is tricky
3810          *  - DECRYPTED: necessary for PN_VALIDATED
3811          */
3812         if (fast_rx->key &&
3813             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3814                 return false;
3815
3816         /* we don't deal with A-MSDU deaggregation here */
3817         if (status->rx_flags & IEEE80211_RX_AMSDU)
3818                 return false;
3819
3820         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3821                 return false;
3822
3823         if (unlikely(ieee80211_is_frag(hdr)))
3824                 return false;
3825
3826         /* Since our interface address cannot be multicast, this
3827          * implicitly also rejects multicast frames without the
3828          * explicit check.
3829          *
3830          * We shouldn't get any *data* frames not addressed to us
3831          * (AP mode will accept multicast *management* frames), but
3832          * punting here will make it go through the full checks in
3833          * ieee80211_accept_frame().
3834          */
3835         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3836                 return false;
3837
3838         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3839                                               IEEE80211_FCTL_TODS)) !=
3840             fast_rx->expected_ds_bits)
3841                 goto drop;
3842
3843         /* assign the key to drop unencrypted frames (later)
3844          * and strip the IV/MIC if necessary
3845          */
3846         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3847                 /* GCMP header length is the same */
3848                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3849         }
3850
3851         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3852                 goto drop;
3853         payload = (void *)(skb->data + snap_offs);
3854
3855         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3856                 return false;
3857
3858         /* Don't handle these here since they require special code.
3859          * Accept AARP and IPX even though they should come with a
3860          * bridge-tunnel header - but if we get them this way then
3861          * there's little point in discarding them.
3862          */
3863         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3864                      payload->proto == fast_rx->control_port_protocol))
3865                 return false;
3866
3867         /* after this point, don't punt to the slowpath! */
3868
3869         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3870             pskb_trim(skb, skb->len - fast_rx->icv_len))
3871                 goto drop;
3872
3873         if (unlikely(fast_rx->sta_notify)) {
3874                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3875                 fast_rx->sta_notify = false;
3876         }
3877
3878         /* statistics part of ieee80211_rx_h_sta_process() */
3879         stats->last_rx = jiffies;
3880         stats->last_rate = sta_stats_encode_rate(status);
3881
3882         stats->fragments++;
3883         stats->packets++;
3884
3885         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3886                 stats->last_signal = status->signal;
3887                 if (!fast_rx->uses_rss)
3888                         ewma_signal_add(&sta->rx_stats_avg.signal,
3889                                         -status->signal);
3890         }
3891
3892         if (status->chains) {
3893                 int i;
3894
3895                 stats->chains = status->chains;
3896                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3897                         int signal = status->chain_signal[i];
3898
3899                         if (!(status->chains & BIT(i)))
3900                                 continue;
3901
3902                         stats->chain_signal_last[i] = signal;
3903                         if (!fast_rx->uses_rss)
3904                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3905                                                 -signal);
3906                 }
3907         }
3908         /* end of statistics */
3909
3910         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3911                 goto drop;
3912
3913         /* do the header conversion - first grab the addresses */
3914         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3915         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3916         /* remove the SNAP but leave the ethertype */
3917         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3918         /* push the addresses in front */
3919         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3920
3921         skb->dev = fast_rx->dev;
3922
3923         ieee80211_rx_stats(fast_rx->dev, skb->len);
3924
3925         /* The seqno index has the same property as needed
3926          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3927          * for non-QoS-data frames. Here we know it's a data
3928          * frame, so count MSDUs.
3929          */
3930         u64_stats_update_begin(&stats->syncp);
3931         stats->msdu[rx->seqno_idx]++;
3932         stats->bytes += orig_len;
3933         u64_stats_update_end(&stats->syncp);
3934
3935         if (fast_rx->internal_forward) {
3936                 struct sk_buff *xmit_skb = NULL;
3937                 bool multicast = is_multicast_ether_addr(skb->data);
3938
3939                 if (multicast) {
3940                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
3941                 } else if (sta_info_get(rx->sdata, skb->data)) {
3942                         xmit_skb = skb;
3943                         skb = NULL;
3944                 }
3945
3946                 if (xmit_skb) {
3947                         /*
3948                          * Send to wireless media and increase priority by 256
3949                          * to keep the received priority instead of
3950                          * reclassifying the frame (see cfg80211_classify8021d).
3951                          */
3952                         xmit_skb->priority += 256;
3953                         xmit_skb->protocol = htons(ETH_P_802_3);
3954                         skb_reset_network_header(xmit_skb);
3955                         skb_reset_mac_header(xmit_skb);
3956                         dev_queue_xmit(xmit_skb);
3957                 }
3958
3959                 if (!skb)
3960                         return true;
3961         }
3962
3963         /* deliver to local stack */
3964         skb->protocol = eth_type_trans(skb, fast_rx->dev);
3965         memset(skb->cb, 0, sizeof(skb->cb));
3966         if (rx->napi)
3967                 napi_gro_receive(rx->napi, skb);
3968         else
3969                 netif_receive_skb(skb);
3970
3971         return true;
3972  drop:
3973         dev_kfree_skb(skb);
3974         stats->dropped++;
3975         return true;
3976 }
3977
3978 /*
3979  * This function returns whether or not the SKB
3980  * was destined for RX processing or not, which,
3981  * if consume is true, is equivalent to whether
3982  * or not the skb was consumed.
3983  */
3984 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3985                                             struct sk_buff *skb, bool consume)
3986 {
3987         struct ieee80211_local *local = rx->local;
3988         struct ieee80211_sub_if_data *sdata = rx->sdata;
3989
3990         rx->skb = skb;
3991
3992         /* See if we can do fast-rx; if we have to copy we already lost,
3993          * so punt in that case. We should never have to deliver a data
3994          * frame to multiple interfaces anyway.
3995          *
3996          * We skip the ieee80211_accept_frame() call and do the necessary
3997          * checking inside ieee80211_invoke_fast_rx().
3998          */
3999         if (consume && rx->sta) {
4000                 struct ieee80211_fast_rx *fast_rx;
4001
4002                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4003                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4004                         return true;
4005         }
4006
4007         if (!ieee80211_accept_frame(rx))
4008                 return false;
4009
4010         if (!consume) {
4011                 skb = skb_copy(skb, GFP_ATOMIC);
4012                 if (!skb) {
4013                         if (net_ratelimit())
4014                                 wiphy_debug(local->hw.wiphy,
4015                                         "failed to copy skb for %s\n",
4016                                         sdata->name);
4017                         return true;
4018                 }
4019
4020                 rx->skb = skb;
4021         }
4022
4023         ieee80211_invoke_rx_handlers(rx);
4024         return true;
4025 }
4026
4027 /*
4028  * This is the actual Rx frames handler. as it belongs to Rx path it must
4029  * be called with rcu_read_lock protection.
4030  */
4031 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4032                                          struct ieee80211_sta *pubsta,
4033                                          struct sk_buff *skb,
4034                                          struct napi_struct *napi)
4035 {
4036         struct ieee80211_local *local = hw_to_local(hw);
4037         struct ieee80211_sub_if_data *sdata;
4038         struct ieee80211_hdr *hdr;
4039         __le16 fc;
4040         struct ieee80211_rx_data rx;
4041         struct ieee80211_sub_if_data *prev;
4042         struct rhlist_head *tmp;
4043         int err = 0;
4044
4045         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4046         memset(&rx, 0, sizeof(rx));
4047         rx.skb = skb;
4048         rx.local = local;
4049         rx.napi = napi;
4050
4051         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4052                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4053
4054         if (ieee80211_is_mgmt(fc)) {
4055                 /* drop frame if too short for header */
4056                 if (skb->len < ieee80211_hdrlen(fc))
4057                         err = -ENOBUFS;
4058                 else
4059                         err = skb_linearize(skb);
4060         } else {
4061                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4062         }
4063
4064         if (err) {
4065                 dev_kfree_skb(skb);
4066                 return;
4067         }
4068
4069         hdr = (struct ieee80211_hdr *)skb->data;
4070         ieee80211_parse_qos(&rx);
4071         ieee80211_verify_alignment(&rx);
4072
4073         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4074                      ieee80211_is_beacon(hdr->frame_control)))
4075                 ieee80211_scan_rx(local, skb);
4076
4077         if (ieee80211_is_data(fc)) {
4078                 struct sta_info *sta, *prev_sta;
4079
4080                 if (pubsta) {
4081                         rx.sta = container_of(pubsta, struct sta_info, sta);
4082                         rx.sdata = rx.sta->sdata;
4083                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4084                                 return;
4085                         goto out;
4086                 }
4087
4088                 prev_sta = NULL;
4089
4090                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4091                         if (!prev_sta) {
4092                                 prev_sta = sta;
4093                                 continue;
4094                         }
4095
4096                         rx.sta = prev_sta;
4097                         rx.sdata = prev_sta->sdata;
4098                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4099
4100                         prev_sta = sta;
4101                 }
4102
4103                 if (prev_sta) {
4104                         rx.sta = prev_sta;
4105                         rx.sdata = prev_sta->sdata;
4106
4107                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4108                                 return;
4109                         goto out;
4110                 }
4111         }
4112
4113         prev = NULL;
4114
4115         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4116                 if (!ieee80211_sdata_running(sdata))
4117                         continue;
4118
4119                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4120                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4121                         continue;
4122
4123                 /*
4124                  * frame is destined for this interface, but if it's
4125                  * not also for the previous one we handle that after
4126                  * the loop to avoid copying the SKB once too much
4127                  */
4128
4129                 if (!prev) {
4130                         prev = sdata;
4131                         continue;
4132                 }
4133
4134                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4135                 rx.sdata = prev;
4136                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4137
4138                 prev = sdata;
4139         }
4140
4141         if (prev) {
4142                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4143                 rx.sdata = prev;
4144
4145                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4146                         return;
4147         }
4148
4149  out:
4150         dev_kfree_skb(skb);
4151 }
4152
4153 /*
4154  * This is the receive path handler. It is called by a low level driver when an
4155  * 802.11 MPDU is received from the hardware.
4156  */
4157 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4158                        struct sk_buff *skb, struct napi_struct *napi)
4159 {
4160         struct ieee80211_local *local = hw_to_local(hw);
4161         struct ieee80211_rate *rate = NULL;
4162         struct ieee80211_supported_band *sband;
4163         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4164
4165         WARN_ON_ONCE(softirq_count() == 0);
4166
4167         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4168                 goto drop;
4169
4170         sband = local->hw.wiphy->bands[status->band];
4171         if (WARN_ON(!sband))
4172                 goto drop;
4173
4174         /*
4175          * If we're suspending, it is possible although not too likely
4176          * that we'd be receiving frames after having already partially
4177          * quiesced the stack. We can't process such frames then since
4178          * that might, for example, cause stations to be added or other
4179          * driver callbacks be invoked.
4180          */
4181         if (unlikely(local->quiescing || local->suspended))
4182                 goto drop;
4183
4184         /* We might be during a HW reconfig, prevent Rx for the same reason */
4185         if (unlikely(local->in_reconfig))
4186                 goto drop;
4187
4188         /*
4189          * The same happens when we're not even started,
4190          * but that's worth a warning.
4191          */
4192         if (WARN_ON(!local->started))
4193                 goto drop;
4194
4195         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4196                 /*
4197                  * Validate the rate, unless a PLCP error means that
4198                  * we probably can't have a valid rate here anyway.
4199                  */
4200
4201                 if (status->flag & RX_FLAG_HT) {
4202                         /*
4203                          * rate_idx is MCS index, which can be [0-76]
4204                          * as documented on:
4205                          *
4206                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4207                          *
4208                          * Anything else would be some sort of driver or
4209                          * hardware error. The driver should catch hardware
4210                          * errors.
4211                          */
4212                         if (WARN(status->rate_idx > 76,
4213                                  "Rate marked as an HT rate but passed "
4214                                  "status->rate_idx is not "
4215                                  "an MCS index [0-76]: %d (0x%02x)\n",
4216                                  status->rate_idx,
4217                                  status->rate_idx))
4218                                 goto drop;
4219                 } else if (status->flag & RX_FLAG_VHT) {
4220                         if (WARN_ONCE(status->rate_idx > 9 ||
4221                                       !status->vht_nss ||
4222                                       status->vht_nss > 8,
4223                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4224                                       status->rate_idx, status->vht_nss))
4225                                 goto drop;
4226                 } else {
4227                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4228                                 goto drop;
4229                         rate = &sband->bitrates[status->rate_idx];
4230                 }
4231         }
4232
4233         status->rx_flags = 0;
4234
4235         /*
4236          * key references and virtual interfaces are protected using RCU
4237          * and this requires that we are in a read-side RCU section during
4238          * receive processing
4239          */
4240         rcu_read_lock();
4241
4242         /*
4243          * Frames with failed FCS/PLCP checksum are not returned,
4244          * all other frames are returned without radiotap header
4245          * if it was previously present.
4246          * Also, frames with less than 16 bytes are dropped.
4247          */
4248         skb = ieee80211_rx_monitor(local, skb, rate);
4249         if (!skb) {
4250                 rcu_read_unlock();
4251                 return;
4252         }
4253
4254         ieee80211_tpt_led_trig_rx(local,
4255                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4256                         skb->len);
4257
4258         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4259
4260         rcu_read_unlock();
4261
4262         return;
4263  drop:
4264         kfree_skb(skb);
4265 }
4266 EXPORT_SYMBOL(ieee80211_rx_napi);
4267
4268 /* This is a version of the rx handler that can be called from hard irq
4269  * context. Post the skb on the queue and schedule the tasklet */
4270 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4271 {
4272         struct ieee80211_local *local = hw_to_local(hw);
4273
4274         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4275
4276         skb->pkt_type = IEEE80211_RX_MSG;
4277         skb_queue_tail(&local->skb_queue, skb);
4278         tasklet_schedule(&local->tasklet);
4279 }
4280 EXPORT_SYMBOL(ieee80211_rx_irqsafe);