net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/jiffies.h>
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/export.h>
  22 #include <linux/bitops.h>
  23 #include <net/mac80211.h>
  24 #include <net/ieee80211_radiotap.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "led.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wpa.h"
  33 #include "tkip.h"
  34 #include "wme.h"
  35 #include "rate.h"
  36
  37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  38 {
  39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  40
  41         u64_stats_update_begin(&tstats->syncp);
  42         tstats->rx_packets++;
  43         tstats->rx_bytes += len;
  44         u64_stats_update_end(&tstats->syncp);
  45 }
  46
  47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  48                                enum nl80211_iftype type)
  49 {
  50         __le16 fc = hdr->frame_control;
  51
  52         if (ieee80211_is_data(fc)) {
  53                 if (len < 24) /* drop incorrect hdr len (data) */
  54                         return NULL;
  55
  56                 if (ieee80211_has_a4(fc))
  57                         return NULL;
  58                 if (ieee80211_has_tods(fc))
  59                         return hdr->addr1;
  60                 if (ieee80211_has_fromds(fc))
  61                         return hdr->addr2;
  62
  63                 return hdr->addr3;
  64         }
  65
  66         if (ieee80211_is_mgmt(fc)) {
  67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  68                         return NULL;
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_ctl(fc)) {
  73                 if (ieee80211_is_pspoll(fc))
  74                         return hdr->addr1;
  75
  76                 if (ieee80211_is_back_req(fc)) {
  77                         switch (type) {
  78                         case NL80211_IFTYPE_STATION:
  79                                 return hdr->addr2;
  80                         case NL80211_IFTYPE_AP:
  81                         case NL80211_IFTYPE_AP_VLAN:
  82                                 return hdr->addr1;
  83                         default:
  84                                 break; /* fall through to the return */
  85                         }
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 /*
  93  * monitor mode reception
  94  *
  95  * This function cleans up the SKB, i.e. it removes all the stuff
  96  * only useful for monitoring.
  97  */
  98 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  99                                            struct sk_buff *skb,
 100                                            unsigned int rtap_vendor_space)
 101 {
 102         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 103                 if (likely(skb->len > FCS_LEN))
 104                         __pskb_trim(skb, skb->len - FCS_LEN);
 105                 else {
 106                         /* driver bug */
 107                         WARN_ON(1);
 108                         dev_kfree_skb(skb);
 109                         return NULL;
 110                 }
 111         }
 112
 113         __pskb_pull(skb, rtap_vendor_space);
 114
 115         return skb;
 116 }
 117
 118 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 119                                      unsigned int rtap_vendor_space)
 120 {
 121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 122         struct ieee80211_hdr *hdr;
 123
 124         hdr = (void *)(skb->data + rtap_vendor_space);
 125
 126         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 127                             RX_FLAG_FAILED_PLCP_CRC |
 128                             RX_FLAG_ONLY_MONITOR))
 129                 return true;
 130
 131         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 132                 return true;
 133
 134         if (ieee80211_is_ctl(hdr->frame_control) &&
 135             !ieee80211_is_pspoll(hdr->frame_control) &&
 136             !ieee80211_is_back_req(hdr->frame_control))
 137                 return true;
 138
 139         return false;
 140 }
 141
 142 static int
 143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 144                              struct ieee80211_rx_status *status,
 145                              struct sk_buff *skb)
 146 {
 147         int len;
 148
 149         /* always present fields */
 150         len = sizeof(struct ieee80211_radiotap_header) + 8;
 151
 152         /* allocate extra bitmaps */
 153         if (status->chains)
 154                 len += 4 * hweight8(status->chains);
 155
 156         if (ieee80211_have_rx_timestamp(status)) {
 157                 len = ALIGN(len, 8);
 158                 len += 8;
 159         }
 160         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 161                 len += 1;
 162
 163         /* antenna field, if we don't have per-chain info */
 164         if (!status->chains)
 165                 len += 1;
 166
 167         /* padding for RX_FLAGS if necessary */
 168         len = ALIGN(len, 2);
 169
 170         if (status->flag & RX_FLAG_HT) /* HT info */
 171                 len += 3;
 172
 173         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 174                 len = ALIGN(len, 4);
 175                 len += 8;
 176         }
 177
 178         if (status->flag & RX_FLAG_VHT) {
 179                 len = ALIGN(len, 2);
 180                 len += 12;
 181         }
 182
 183         if (status->chains) {
 184                 /* antenna and antenna signal fields */
 185                 len += 2 * hweight8(status->chains);
 186         }
 187
 188         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 189                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 190
 191                 /* vendor presence bitmap */
 192                 len += 4;
 193                 /* alignment for fixed 6-byte vendor data header */
 194                 len = ALIGN(len, 2);
 195                 /* vendor data header */
 196                 len += 6;
 197                 if (WARN_ON(rtap->align == 0))
 198                         rtap->align = 1;
 199                 len = ALIGN(len, rtap->align);
 200                 len += rtap->len + rtap->pad;
 201         }
 202
 203         return len;
 204 }
 205
 206 /*
 207  * ieee80211_add_rx_radiotap_header - add radiotap header
 208  *
 209  * add a radiotap header containing all the fields which the hardware provided.
 210  */
 211 static void
 212 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 213                                  struct sk_buff *skb,
 214                                  struct ieee80211_rate *rate,
 215                                  int rtap_len, bool has_fcs)
 216 {
 217         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 218         struct ieee80211_radiotap_header *rthdr;
 219         unsigned char *pos;
 220         __le32 *it_present;
 221         u32 it_present_val;
 222         u16 rx_flags = 0;
 223         u16 channel_flags = 0;
 224         int mpdulen, chain;
 225         unsigned long chains = status->chains;
 226         struct ieee80211_vendor_radiotap rtap = {};
 227
 228         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 229                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 230                 /* rtap.len and rtap.pad are undone immediately */
 231                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 232         }
 233
 234         mpdulen = skb->len;
 235         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 236                 mpdulen += FCS_LEN;
 237
 238         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 239         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 240         it_present = &rthdr->it_present;
 241
 242         /* radiotap header, set always present flags */
 243         rthdr->it_len = cpu_to_le16(rtap_len);
 244         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 245                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 246                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 247
 248         if (!status->chains)
 249                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 250
 251         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 252                 it_present_val |=
 253                         BIT(IEEE80211_RADIOTAP_EXT) |
 254                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 255                 put_unaligned_le32(it_present_val, it_present);
 256                 it_present++;
 257                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 258                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 259         }
 260
 261         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 262                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 263                                   BIT(IEEE80211_RADIOTAP_EXT);
 264                 put_unaligned_le32(it_present_val, it_present);
 265                 it_present++;
 266                 it_present_val = rtap.present;
 267         }
 268
 269         put_unaligned_le32(it_present_val, it_present);
 270
 271         pos = (void *)(it_present + 1);
 272
 273         /* the order of the following fields is important */
 274
 275         /* IEEE80211_RADIOTAP_TSFT */
 276         if (ieee80211_have_rx_timestamp(status)) {
 277                 /* padding */
 278                 while ((pos - (u8 *)rthdr) & 7)
 279                         *pos++ = 0;
 280                 put_unaligned_le64(
 281                         ieee80211_calculate_rx_timestamp(local, status,
 282                                                          mpdulen, 0),
 283                         pos);
 284                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 285                 pos += 8;
 286         }
 287
 288         /* IEEE80211_RADIOTAP_FLAGS */
 289         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 290                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 291         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 292                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 293         if (status->flag & RX_FLAG_SHORTPRE)
 294                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 295         pos++;
 296
 297         /* IEEE80211_RADIOTAP_RATE */
 298         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 299                 /*
 300                  * Without rate information don't add it. If we have,
 301                  * MCS information is a separate field in radiotap,
 302                  * added below. The byte here is needed as padding
 303                  * for the channel though, so initialise it to 0.
 304                  */
 305                 *pos = 0;
 306         } else {
 307                 int shift = 0;
 308                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 309                 if (status->flag & RX_FLAG_10MHZ)
 310                         shift = 1;
 311                 else if (status->flag & RX_FLAG_5MHZ)
 312                         shift = 2;
 313                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 314         }
 315         pos++;
 316
 317         /* IEEE80211_RADIOTAP_CHANNEL */
 318         put_unaligned_le16(status->freq, pos);
 319         pos += 2;
 320         if (status->flag & RX_FLAG_10MHZ)
 321                 channel_flags |= IEEE80211_CHAN_HALF;
 322         else if (status->flag & RX_FLAG_5MHZ)
 323                 channel_flags |= IEEE80211_CHAN_QUARTER;
 324
 325         if (status->band == NL80211_BAND_5GHZ)
 326                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 327         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 328                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 329         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 330                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 331         else if (rate)
 332                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 333         else
 334                 channel_flags |= IEEE80211_CHAN_2GHZ;
 335         put_unaligned_le16(channel_flags, pos);
 336         pos += 2;
 337
 338         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 339         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 340             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 341                 *pos = status->signal;
 342                 rthdr->it_present |=
 343                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 344                 pos++;
 345         }
 346
 347         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 348
 349         if (!status->chains) {
 350                 /* IEEE80211_RADIOTAP_ANTENNA */
 351                 *pos = status->antenna;
 352                 pos++;
 353         }
 354
 355         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 356
 357         /* IEEE80211_RADIOTAP_RX_FLAGS */
 358         /* ensure 2 byte alignment for the 2 byte field as required */
 359         if ((pos - (u8 *)rthdr) & 1)
 360                 *pos++ = 0;
 361         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 362                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 363         put_unaligned_le16(rx_flags, pos);
 364         pos += 2;
 365
 366         if (status->flag & RX_FLAG_HT) {
 367                 unsigned int stbc;
 368
 369                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 370                 *pos++ = local->hw.radiotap_mcs_details;
 371                 *pos = 0;
 372                 if (status->flag & RX_FLAG_SHORT_GI)
 373                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 374                 if (status->flag & RX_FLAG_40MHZ)
 375                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 376                 if (status->flag & RX_FLAG_HT_GF)
 377                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 378                 if (status->flag & RX_FLAG_LDPC)
 379                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 380                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 381                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 382                 pos++;
 383                 *pos++ = status->rate_idx;
 384         }
 385
 386         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 387                 u16 flags = 0;
 388
 389                 /* ensure 4 byte alignment */
 390                 while ((pos - (u8 *)rthdr) & 3)
 391                         pos++;
 392                 rthdr->it_present |=
 393                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 394                 put_unaligned_le32(status->ampdu_reference, pos);
 395                 pos += 4;
 396                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 397                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 398                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 399                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 400                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 401                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 402                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 403                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 404                 put_unaligned_le16(flags, pos);
 405                 pos += 2;
 406                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 407                         *pos++ = status->ampdu_delimiter_crc;
 408                 else
 409                         *pos++ = 0;
 410                 *pos++ = 0;
 411         }
 412
 413         if (status->flag & RX_FLAG_VHT) {
 414                 u16 known = local->hw.radiotap_vht_details;
 415
 416                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 417                 put_unaligned_le16(known, pos);
 418                 pos += 2;
 419                 /* flags */
 420                 if (status->flag & RX_FLAG_SHORT_GI)
 421                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 422                 /* in VHT, STBC is binary */
 423                 if (status->flag & RX_FLAG_STBC_MASK)
 424                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 425                 if (status->vht_flag & RX_VHT_FLAG_BF)
 426                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 427                 pos++;
 428                 /* bandwidth */
 429                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 430                         *pos++ = 4;
 431                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 432                         *pos++ = 11;
 433                 else if (status->flag & RX_FLAG_40MHZ)
 434                         *pos++ = 1;
 435                 else /* 20 MHz */
 436                         *pos++ = 0;
 437                 /* MCS/NSS */
 438                 *pos = (status->rate_idx << 4) | status->vht_nss;
 439                 pos += 4;
 440                 /* coding field */
 441                 if (status->flag & RX_FLAG_LDPC)
 442                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 443                 pos++;
 444                 /* group ID */
 445                 pos++;
 446                 /* partial_aid */
 447                 pos += 2;
 448         }
 449
 450         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 451                 *pos++ = status->chain_signal[chain];
 452                 *pos++ = chain;
 453         }
 454
 455         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 456                 /* ensure 2 byte alignment for the vendor field as required */
 457                 if ((pos - (u8 *)rthdr) & 1)
 458                         *pos++ = 0;
 459                 *pos++ = rtap.oui[0];
 460                 *pos++ = rtap.oui[1];
 461                 *pos++ = rtap.oui[2];
 462                 *pos++ = rtap.subns;
 463                 put_unaligned_le16(rtap.len, pos);
 464                 pos += 2;
 465                 /* align the actual payload as requested */
 466                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 467                         *pos++ = 0;
 468                 /* data (and possible padding) already follows */
 469         }
 470 }
 471
 472 /*
 473  * This function copies a received frame to all monitor interfaces and
 474  * returns a cleaned-up SKB that no longer includes the FCS nor the
 475  * radiotap header the driver might have added.
 476  */
 477 static struct sk_buff *
 478 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 479                      struct ieee80211_rate *rate)
 480 {
 481         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 482         struct ieee80211_sub_if_data *sdata;
 483         int rt_hdrlen, needed_headroom;
 484         struct sk_buff *skb, *skb2;
 485         struct net_device *prev_dev = NULL;
 486         int present_fcs_len = 0;
 487         unsigned int rtap_vendor_space = 0;
 488
 489         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 490                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 491
 492                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 493         }
 494
 495         /*
 496          * First, we may need to make a copy of the skb because
 497          *  (1) we need to modify it for radiotap (if not present), and
 498          *  (2) the other RX handlers will modify the skb we got.
 499          *
 500          * We don't need to, of course, if we aren't going to return
 501          * the SKB because it has a bad FCS/PLCP checksum.
 502          */
 503
 504         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 505                 present_fcs_len = FCS_LEN;
 506
 507         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 508         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 509                 dev_kfree_skb(origskb);
 510                 return NULL;
 511         }
 512
 513         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 514                 if (should_drop_frame(origskb, present_fcs_len,
 515                                       rtap_vendor_space)) {
 516                         dev_kfree_skb(origskb);
 517                         return NULL;
 518                 }
 519
 520                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 521         }
 522
 523         /* room for the radiotap header based on driver features */
 524         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 525         needed_headroom = rt_hdrlen - rtap_vendor_space;
 526
 527         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 528                 /* only need to expand headroom if necessary */
 529                 skb = origskb;
 530                 origskb = NULL;
 531
 532                 /*
 533                  * This shouldn't trigger often because most devices have an
 534                  * RX header they pull before we get here, and that should
 535                  * be big enough for our radiotap information. We should
 536                  * probably export the length to drivers so that we can have
 537                  * them allocate enough headroom to start with.
 538                  */
 539                 if (skb_headroom(skb) < needed_headroom &&
 540                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 541                         dev_kfree_skb(skb);
 542                         return NULL;
 543                 }
 544         } else {
 545                 /*
 546                  * Need to make a copy and possibly remove radiotap header
 547                  * and FCS from the original.
 548                  */
 549                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 550
 551                 origskb = remove_monitor_info(local, origskb,
 552                                               rtap_vendor_space);
 553
 554                 if (!skb)
 555                         return origskb;
 556         }
 557
 558         /* prepend radiotap information */
 559         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 560
 561         skb_reset_mac_header(skb);
 562         skb->ip_summed = CHECKSUM_UNNECESSARY;
 563         skb->pkt_type = PACKET_OTHERHOST;
 564         skb->protocol = htons(ETH_P_802_2);
 565
 566         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 567                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 568                         continue;
 569
 570                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 571                         continue;
 572
 573                 if (!ieee80211_sdata_running(sdata))
 574                         continue;
 575
 576                 if (prev_dev) {
 577                         skb2 = skb_clone(skb, GFP_ATOMIC);
 578                         if (skb2) {
 579                                 skb2->dev = prev_dev;
 580                                 netif_receive_skb(skb2);
 581                         }
 582                 }
 583
 584                 prev_dev = sdata->dev;
 585                 ieee80211_rx_stats(sdata->dev, skb->len);
 586         }
 587
 588         if (prev_dev) {
 589                 skb->dev = prev_dev;
 590                 netif_receive_skb(skb);
 591         } else
 592                 dev_kfree_skb(skb);
 593
 594         return origskb;
 595 }
 596
 597 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 598 {
 599         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 600         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 601         int tid, seqno_idx, security_idx;
 602
 603         /* does the frame have a qos control field? */
 604         if (ieee80211_is_data_qos(hdr->frame_control)) {
 605                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 606                 /* frame has qos control */
 607                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 608                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 609                         status->rx_flags |= IEEE80211_RX_AMSDU;
 610
 611                 seqno_idx = tid;
 612                 security_idx = tid;
 613         } else {
 614                 /*
 615                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 616                  *
 617                  *      Sequence numbers for management frames, QoS data
 618                  *      frames with a broadcast/multicast address in the
 619                  *      Address 1 field, and all non-QoS data frames sent
 620                  *      by QoS STAs are assigned using an additional single
 621                  *      modulo-4096 counter, [...]
 622                  *
 623                  * We also use that counter for non-QoS STAs.
 624                  */
 625                 seqno_idx = IEEE80211_NUM_TIDS;
 626                 security_idx = 0;
 627                 if (ieee80211_is_mgmt(hdr->frame_control))
 628                         security_idx = IEEE80211_NUM_TIDS;
 629                 tid = 0;
 630         }
 631
 632         rx->seqno_idx = seqno_idx;
 633         rx->security_idx = security_idx;
 634         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 635          * For now, set skb->priority to 0 for other cases. */
 636         rx->skb->priority = (tid > 7) ? 0 : tid;
 637 }
 638
 639 /**
 640  * DOC: Packet alignment
 641  *
 642  * Drivers always need to pass packets that are aligned to two-byte boundaries
 643  * to the stack.
 644  *
 645  * Additionally, should, if possible, align the payload data in a way that
 646  * guarantees that the contained IP header is aligned to a four-byte
 647  * boundary. In the case of regular frames, this simply means aligning the
 648  * payload to a four-byte boundary (because either the IP header is directly
 649  * contained, or IV/RFC1042 headers that have a length divisible by four are
 650  * in front of it).  If the payload data is not properly aligned and the
 651  * architecture doesn't support efficient unaligned operations, mac80211
 652  * will align the data.
 653  *
 654  * With A-MSDU frames, however, the payload data address must yield two modulo
 655  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 656  * push the IP header further back to a multiple of four again. Thankfully, the
 657  * specs were sane enough this time around to require padding each A-MSDU
 658  * subframe to a length that is a multiple of four.
 659  *
 660  * Padding like Atheros hardware adds which is between the 802.11 header and
 661  * the payload is not supported, the driver is required to move the 802.11
 662  * header to be directly in front of the payload in that case.
 663  */
 664 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 665 {
 666 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 667         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 668 #endif
 669 }
 670
 671
 672 /* rx handlers */
 673
 674 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 675 {
 676         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 677
 678         if (is_multicast_ether_addr(hdr->addr1))
 679                 return 0;
 680
 681         return ieee80211_is_robust_mgmt_frame(skb);
 682 }
 683
 684
 685 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 686 {
 687         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 688
 689         if (!is_multicast_ether_addr(hdr->addr1))
 690                 return 0;
 691
 692         return ieee80211_is_robust_mgmt_frame(skb);
 693 }
 694
 695
 696 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 697 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 698 {
 699         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 700         struct ieee80211_mmie *mmie;
 701         struct ieee80211_mmie_16 *mmie16;
 702
 703         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 704                 return -1;
 705
 706         if (!ieee80211_is_robust_mgmt_frame(skb))
 707                 return -1; /* not a robust management frame */
 708
 709         mmie = (struct ieee80211_mmie *)
 710                 (skb->data + skb->len - sizeof(*mmie));
 711         if (mmie->element_id == WLAN_EID_MMIE &&
 712             mmie->length == sizeof(*mmie) - 2)
 713                 return le16_to_cpu(mmie->key_id);
 714
 715         mmie16 = (struct ieee80211_mmie_16 *)
 716                 (skb->data + skb->len - sizeof(*mmie16));
 717         if (skb->len >= 24 + sizeof(*mmie16) &&
 718             mmie16->element_id == WLAN_EID_MMIE &&
 719             mmie16->length == sizeof(*mmie16) - 2)
 720                 return le16_to_cpu(mmie16->key_id);
 721
 722         return -1;
 723 }
 724
 725 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 726                                   struct sk_buff *skb)
 727 {
 728         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 729         __le16 fc;
 730         int hdrlen;
 731         u8 keyid;
 732
 733         fc = hdr->frame_control;
 734         hdrlen = ieee80211_hdrlen(fc);
 735
 736         if (skb->len < hdrlen + cs->hdr_len)
 737                 return -EINVAL;
 738
 739         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 740         keyid &= cs->key_idx_mask;
 741         keyid >>= cs->key_idx_shift;
 742
 743         return keyid;
 744 }
 745
 746 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 747 {
 748         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 749         char *dev_addr = rx->sdata->vif.addr;
 750
 751         if (ieee80211_is_data(hdr->frame_control)) {
 752                 if (is_multicast_ether_addr(hdr->addr1)) {
 753                         if (ieee80211_has_tods(hdr->frame_control) ||
 754                             !ieee80211_has_fromds(hdr->frame_control))
 755                                 return RX_DROP_MONITOR;
 756                         if (ether_addr_equal(hdr->addr3, dev_addr))
 757                                 return RX_DROP_MONITOR;
 758                 } else {
 759                         if (!ieee80211_has_a4(hdr->frame_control))
 760                                 return RX_DROP_MONITOR;
 761                         if (ether_addr_equal(hdr->addr4, dev_addr))
 762                                 return RX_DROP_MONITOR;
 763                 }
 764         }
 765
 766         /* If there is not an established peer link and this is not a peer link
 767          * establisment frame, beacon or probe, drop the frame.
 768          */
 769
 770         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 771                 struct ieee80211_mgmt *mgmt;
 772
 773                 if (!ieee80211_is_mgmt(hdr->frame_control))
 774                         return RX_DROP_MONITOR;
 775
 776                 if (ieee80211_is_action(hdr->frame_control)) {
 777                         u8 category;
 778
 779                         /* make sure category field is present */
 780                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 781                                 return RX_DROP_MONITOR;
 782
 783                         mgmt = (struct ieee80211_mgmt *)hdr;
 784                         category = mgmt->u.action.category;
 785                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 786                             category != WLAN_CATEGORY_SELF_PROTECTED)
 787                                 return RX_DROP_MONITOR;
 788                         return RX_CONTINUE;
 789                 }
 790
 791                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 792                     ieee80211_is_probe_resp(hdr->frame_control) ||
 793                     ieee80211_is_beacon(hdr->frame_control) ||
 794                     ieee80211_is_auth(hdr->frame_control))
 795                         return RX_CONTINUE;
 796
 797                 return RX_DROP_MONITOR;
 798         }
 799
 800         return RX_CONTINUE;
 801 }
 802
 803 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 804                                               int index)
 805 {
 806         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 807         struct sk_buff *tail = skb_peek_tail(frames);
 808         struct ieee80211_rx_status *status;
 809
 810         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 811                 return true;
 812
 813         if (!tail)
 814                 return false;
 815
 816         status = IEEE80211_SKB_RXCB(tail);
 817         if (status->flag & RX_FLAG_AMSDU_MORE)
 818                 return false;
 819
 820         return true;
 821 }
 822
 823 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 824                                             struct tid_ampdu_rx *tid_agg_rx,
 825                                             int index,
 826                                             struct sk_buff_head *frames)
 827 {
 828         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 829         struct sk_buff *skb;
 830         struct ieee80211_rx_status *status;
 831
 832         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 833
 834         if (skb_queue_empty(skb_list))
 835                 goto no_frame;
 836
 837         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 838                 __skb_queue_purge(skb_list);
 839                 goto no_frame;
 840         }
 841
 842         /* release frames from the reorder ring buffer */
 843         tid_agg_rx->stored_mpdu_num--;
 844         while ((skb = __skb_dequeue(skb_list))) {
 845                 status = IEEE80211_SKB_RXCB(skb);
 846                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 847                 __skb_queue_tail(frames, skb);
 848         }
 849
 850 no_frame:
 851         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 852         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 853 }
 854
 855 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 856                                              struct tid_ampdu_rx *tid_agg_rx,
 857                                              u16 head_seq_num,
 858                                              struct sk_buff_head *frames)
 859 {
 860         int index;
 861
 862         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 863
 864         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 865                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 866                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 867                                                 frames);
 868         }
 869 }
 870
 871 /*
 872  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 873  * the skb was added to the buffer longer than this time ago, the earlier
 874  * frames that have not yet been received are assumed to be lost and the skb
 875  * can be released for processing. This may also release other skb's from the
 876  * reorder buffer if there are no additional gaps between the frames.
 877  *
 878  * Callers must hold tid_agg_rx->reorder_lock.
 879  */
 880 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 881
 882 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 883                                           struct tid_ampdu_rx *tid_agg_rx,
 884                                           struct sk_buff_head *frames)
 885 {
 886         int index, i, j;
 887
 888         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 889
 890         /* release the buffer until next missing frame */
 891         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 892         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 893             tid_agg_rx->stored_mpdu_num) {
 894                 /*
 895                  * No buffers ready to be released, but check whether any
 896                  * frames in the reorder buffer have timed out.
 897                  */
 898                 int skipped = 1;
 899                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 900                      j = (j + 1) % tid_agg_rx->buf_size) {
 901                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
 902                                 skipped++;
 903                                 continue;
 904                         }
 905                         if (skipped &&
 906                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 907                                         HT_RX_REORDER_BUF_TIMEOUT))
 908                                 goto set_release_timer;
 909
 910                         /* don't leave incomplete A-MSDUs around */
 911                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 912                              i = (i + 1) % tid_agg_rx->buf_size)
 913                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 914
 915                         ht_dbg_ratelimited(sdata,
 916                                            "release an RX reorder frame due to timeout on earlier frames\n");
 917                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 918                                                         frames);
 919
 920                         /*
 921                          * Increment the head seq# also for the skipped slots.
 922                          */
 923                         tid_agg_rx->head_seq_num =
 924                                 (tid_agg_rx->head_seq_num +
 925                                  skipped) & IEEE80211_SN_MASK;
 926                         skipped = 0;
 927                 }
 928         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 929                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 930                                                 frames);
 931                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 932         }
 933
 934         if (tid_agg_rx->stored_mpdu_num) {
 935                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 936
 937                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 938                      j = (j + 1) % tid_agg_rx->buf_size) {
 939                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
 940                                 break;
 941                 }
 942
 943  set_release_timer:
 944
 945                 if (!tid_agg_rx->removed)
 946                         mod_timer(&tid_agg_rx->reorder_timer,
 947                                   tid_agg_rx->reorder_time[j] + 1 +
 948                                   HT_RX_REORDER_BUF_TIMEOUT);
 949         } else {
 950                 del_timer(&tid_agg_rx->reorder_timer);
 951         }
 952 }
 953
 954 /*
 955  * As this function belongs to the RX path it must be under
 956  * rcu_read_lock protection. It returns false if the frame
 957  * can be processed immediately, true if it was consumed.
 958  */
 959 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 960                                              struct tid_ampdu_rx *tid_agg_rx,
 961                                              struct sk_buff *skb,
 962                                              struct sk_buff_head *frames)
 963 {
 964         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 965         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 966         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 967         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 968         u16 head_seq_num, buf_size;
 969         int index;
 970         bool ret = true;
 971
 972         spin_lock(&tid_agg_rx->reorder_lock);
 973
 974         /*
 975          * Offloaded BA sessions have no known starting sequence number so pick
 976          * one from first Rxed frame for this tid after BA was started.
 977          */
 978         if (unlikely(tid_agg_rx->auto_seq)) {
 979                 tid_agg_rx->auto_seq = false;
 980                 tid_agg_rx->ssn = mpdu_seq_num;
 981                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 982         }
 983
 984         buf_size = tid_agg_rx->buf_size;
 985         head_seq_num = tid_agg_rx->head_seq_num;
 986
 987         /* frame with out of date sequence number */
 988         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 989                 dev_kfree_skb(skb);
 990                 goto out;
 991         }
 992
 993         /*
 994          * If frame the sequence number exceeds our buffering window
 995          * size release some previous frames to make room for this one.
 996          */
 997         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 998                 head_seq_num = ieee80211_sn_inc(
 999                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1000                 /* release stored frames up to new head to stack */
1001                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1002                                                  head_seq_num, frames);
1003         }
1004
1005         /* Now the new frame is always in the range of the reordering buffer */
1006
1007         index = mpdu_seq_num % tid_agg_rx->buf_size;
1008
1009         /* check if we already stored this frame */
1010         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1011                 dev_kfree_skb(skb);
1012                 goto out;
1013         }
1014
1015         /*
1016          * If the current MPDU is in the right order and nothing else
1017          * is stored we can process it directly, no need to buffer it.
1018          * If it is first but there's something stored, we may be able
1019          * to release frames after this one.
1020          */
1021         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1022             tid_agg_rx->stored_mpdu_num == 0) {
1023                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1024                         tid_agg_rx->head_seq_num =
1025                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1026                 ret = false;
1027                 goto out;
1028         }
1029
1030         /* put the frame in the reordering buffer */
1031         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1032         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1033                 tid_agg_rx->reorder_time[index] = jiffies;
1034                 tid_agg_rx->stored_mpdu_num++;
1035                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1036         }
1037
1038  out:
1039         spin_unlock(&tid_agg_rx->reorder_lock);
1040         return ret;
1041 }
1042
1043 /*
1044  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1045  * true if the MPDU was buffered, false if it should be processed.
1046  */
1047 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1048                                        struct sk_buff_head *frames)
1049 {
1050         struct sk_buff *skb = rx->skb;
1051         struct ieee80211_local *local = rx->local;
1052         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1053         struct sta_info *sta = rx->sta;
1054         struct tid_ampdu_rx *tid_agg_rx;
1055         u16 sc;
1056         u8 tid, ack_policy;
1057
1058         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1059             is_multicast_ether_addr(hdr->addr1))
1060                 goto dont_reorder;
1061
1062         /*
1063          * filter the QoS data rx stream according to
1064          * STA/TID and check if this STA/TID is on aggregation
1065          */
1066
1067         if (!sta)
1068                 goto dont_reorder;
1069
1070         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1071                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1072         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1073
1074         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1075         if (!tid_agg_rx)
1076                 goto dont_reorder;
1077
1078         /* qos null data frames are excluded */
1079         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1080                 goto dont_reorder;
1081
1082         /* not part of a BA session */
1083         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1084             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1085                 goto dont_reorder;
1086
1087         /* new, potentially un-ordered, ampdu frame - process it */
1088
1089         /* reset session timer */
1090         if (tid_agg_rx->timeout)
1091                 tid_agg_rx->last_rx = jiffies;
1092
1093         /* if this mpdu is fragmented - terminate rx aggregation session */
1094         sc = le16_to_cpu(hdr->seq_ctrl);
1095         if (sc & IEEE80211_SCTL_FRAG) {
1096                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1097                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1098                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1099                 return;
1100         }
1101
1102         /*
1103          * No locking needed -- we will only ever process one
1104          * RX packet at a time, and thus own tid_agg_rx. All
1105          * other code manipulating it needs to (and does) make
1106          * sure that we cannot get to it any more before doing
1107          * anything with it.
1108          */
1109         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1110                                              frames))
1111                 return;
1112
1113  dont_reorder:
1114         __skb_queue_tail(frames, skb);
1115 }
1116
1117 static ieee80211_rx_result debug_noinline
1118 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1119 {
1120         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1122
1123         if (status->flag & RX_FLAG_DUP_VALIDATED)
1124                 return RX_CONTINUE;
1125
1126         /*
1127          * Drop duplicate 802.11 retransmissions
1128          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1129          */
1130
1131         if (rx->skb->len < 24)
1132                 return RX_CONTINUE;
1133
1134         if (ieee80211_is_ctl(hdr->frame_control) ||
1135             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1136             is_multicast_ether_addr(hdr->addr1))
1137                 return RX_CONTINUE;
1138
1139         if (!rx->sta)
1140                 return RX_CONTINUE;
1141
1142         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1143                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1144                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1145                 rx->sta->rx_stats.num_duplicates++;
1146                 return RX_DROP_UNUSABLE;
1147         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1148                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1149         }
1150
1151         return RX_CONTINUE;
1152 }
1153
1154 static ieee80211_rx_result debug_noinline
1155 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1156 {
1157         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1158
1159         /* Drop disallowed frame classes based on STA auth/assoc state;
1160          * IEEE 802.11, Chap 5.5.
1161          *
1162          * mac80211 filters only based on association state, i.e. it drops
1163          * Class 3 frames from not associated stations. hostapd sends
1164          * deauth/disassoc frames when needed. In addition, hostapd is
1165          * responsible for filtering on both auth and assoc states.
1166          */
1167
1168         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1169                 return ieee80211_rx_mesh_check(rx);
1170
1171         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1172                       ieee80211_is_pspoll(hdr->frame_control)) &&
1173                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1174                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1175                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1176                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1177                 /*
1178                  * accept port control frames from the AP even when it's not
1179                  * yet marked ASSOC to prevent a race where we don't set the
1180                  * assoc bit quickly enough before it sends the first frame
1181                  */
1182                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1183                     ieee80211_is_data_present(hdr->frame_control)) {
1184                         unsigned int hdrlen;
1185                         __be16 ethertype;
1186
1187                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1188
1189                         if (rx->skb->len < hdrlen + 8)
1190                                 return RX_DROP_MONITOR;
1191
1192                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1193                         if (ethertype == rx->sdata->control_port_protocol)
1194                                 return RX_CONTINUE;
1195                 }
1196
1197                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1198                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1199                                                hdr->addr2,
1200                                                GFP_ATOMIC))
1201                         return RX_DROP_UNUSABLE;
1202
1203                 return RX_DROP_MONITOR;
1204         }
1205
1206         return RX_CONTINUE;
1207 }
1208
1209
1210 static ieee80211_rx_result debug_noinline
1211 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1212 {
1213         struct ieee80211_local *local;
1214         struct ieee80211_hdr *hdr;
1215         struct sk_buff *skb;
1216
1217         local = rx->local;
1218         skb = rx->skb;
1219         hdr = (struct ieee80211_hdr *) skb->data;
1220
1221         if (!local->pspolling)
1222                 return RX_CONTINUE;
1223
1224         if (!ieee80211_has_fromds(hdr->frame_control))
1225                 /* this is not from AP */
1226                 return RX_CONTINUE;
1227
1228         if (!ieee80211_is_data(hdr->frame_control))
1229                 return RX_CONTINUE;
1230
1231         if (!ieee80211_has_moredata(hdr->frame_control)) {
1232                 /* AP has no more frames buffered for us */
1233                 local->pspolling = false;
1234                 return RX_CONTINUE;
1235         }
1236
1237         /* more data bit is set, let's request a new frame from the AP */
1238         ieee80211_send_pspoll(local, rx->sdata);
1239
1240         return RX_CONTINUE;
1241 }
1242
1243 static void sta_ps_start(struct sta_info *sta)
1244 {
1245         struct ieee80211_sub_if_data *sdata = sta->sdata;
1246         struct ieee80211_local *local = sdata->local;
1247         struct ps_data *ps;
1248         int tid;
1249
1250         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1251             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252                 ps = &sdata->bss->ps;
1253         else
1254                 return;
1255
1256         atomic_inc(&ps->num_sta_ps);
1257         set_sta_flag(sta, WLAN_STA_PS_STA);
1258         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1259                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1260         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1261                sta->sta.addr, sta->sta.aid);
1262
1263         ieee80211_clear_fast_xmit(sta);
1264
1265         if (!sta->sta.txq[0])
1266                 return;
1267
1268         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1269                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1270
1271                 if (!txqi->tin.backlog_packets)
1272                         set_bit(tid, &sta->txq_buffered_tids);
1273                 else
1274                         clear_bit(tid, &sta->txq_buffered_tids);
1275         }
1276 }
1277
1278 static void sta_ps_end(struct sta_info *sta)
1279 {
1280         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1281                sta->sta.addr, sta->sta.aid);
1282
1283         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1284                 /*
1285                  * Clear the flag only if the other one is still set
1286                  * so that the TX path won't start TX'ing new frames
1287                  * directly ... In the case that the driver flag isn't
1288                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1289                  */
1290                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1291                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1292                        sta->sta.addr, sta->sta.aid);
1293                 return;
1294         }
1295
1296         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1297         clear_sta_flag(sta, WLAN_STA_PS_STA);
1298         ieee80211_sta_ps_deliver_wakeup(sta);
1299 }
1300
1301 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1302 {
1303         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1304         bool in_ps;
1305
1306         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1307
1308         /* Don't let the same PS state be set twice */
1309         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1310         if ((start && in_ps) || (!start && !in_ps))
1311                 return -EINVAL;
1312
1313         if (start)
1314                 sta_ps_start(sta);
1315         else
1316                 sta_ps_end(sta);
1317
1318         return 0;
1319 }
1320 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1321
1322 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1323 {
1324         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1325
1326         if (test_sta_flag(sta, WLAN_STA_SP))
1327                 return;
1328
1329         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1330                 ieee80211_sta_ps_deliver_poll_response(sta);
1331         else
1332                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1333 }
1334 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1335
1336 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1337 {
1338         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1339         u8 ac = ieee802_1d_to_ac[tid & 7];
1340
1341         /*
1342          * If this AC is not trigger-enabled do nothing.
1343          *
1344          * NB: This could/should check a separate bitmap of trigger-
1345          * enabled queues, but for now we only implement uAPSD w/o
1346          * TSPEC changes to the ACs, so they're always the same.
1347          */
1348         if (!(sta->sta.uapsd_queues & BIT(ac)))
1349                 return;
1350
1351         /* if we are in a service period, do nothing */
1352         if (test_sta_flag(sta, WLAN_STA_SP))
1353                 return;
1354
1355         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1356                 ieee80211_sta_ps_deliver_uapsd(sta);
1357         else
1358                 set_sta_flag(sta, WLAN_STA_UAPSD);
1359 }
1360 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1361
1362 static ieee80211_rx_result debug_noinline
1363 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1364 {
1365         struct ieee80211_sub_if_data *sdata = rx->sdata;
1366         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1367         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1368
1369         if (!rx->sta)
1370                 return RX_CONTINUE;
1371
1372         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1373             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1374                 return RX_CONTINUE;
1375
1376         /*
1377          * The device handles station powersave, so don't do anything about
1378          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1379          * it to mac80211 since they're handled.)
1380          */
1381         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1382                 return RX_CONTINUE;
1383
1384         /*
1385          * Don't do anything if the station isn't already asleep. In
1386          * the uAPSD case, the station will probably be marked asleep,
1387          * in the PS-Poll case the station must be confused ...
1388          */
1389         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1390                 return RX_CONTINUE;
1391
1392         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1393                 ieee80211_sta_pspoll(&rx->sta->sta);
1394
1395                 /* Free PS Poll skb here instead of returning RX_DROP that would
1396                  * count as an dropped frame. */
1397                 dev_kfree_skb(rx->skb);
1398
1399                 return RX_QUEUED;
1400         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1401                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1402                    ieee80211_has_pm(hdr->frame_control) &&
1403                    (ieee80211_is_data_qos(hdr->frame_control) ||
1404                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1405                 u8 tid;
1406
1407                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1408
1409                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1410         }
1411
1412         return RX_CONTINUE;
1413 }
1414
1415 static ieee80211_rx_result debug_noinline
1416 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1417 {
1418         struct sta_info *sta = rx->sta;
1419         struct sk_buff *skb = rx->skb;
1420         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1421         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1422         int i;
1423
1424         if (!sta)
1425                 return RX_CONTINUE;
1426
1427         /*
1428          * Update last_rx only for IBSS packets which are for the current
1429          * BSSID and for station already AUTHORIZED to avoid keeping the
1430          * current IBSS network alive in cases where other STAs start
1431          * using different BSSID. This will also give the station another
1432          * chance to restart the authentication/authorization in case
1433          * something went wrong the first time.
1434          */
1435         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1436                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1437                                                 NL80211_IFTYPE_ADHOC);
1438                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1439                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1440                         sta->rx_stats.last_rx = jiffies;
1441                         if (ieee80211_is_data(hdr->frame_control) &&
1442                             !is_multicast_ether_addr(hdr->addr1))
1443                                 sta->rx_stats.last_rate =
1444                                         sta_stats_encode_rate(status);
1445                 }
1446         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1447                 sta->rx_stats.last_rx = jiffies;
1448         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1449                 /*
1450                  * Mesh beacons will update last_rx when if they are found to
1451                  * match the current local configuration when processed.
1452                  */
1453                 sta->rx_stats.last_rx = jiffies;
1454                 if (ieee80211_is_data(hdr->frame_control))
1455                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1456         }
1457
1458         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1459                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1460
1461         sta->rx_stats.fragments++;
1462
1463         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1464         sta->rx_stats.bytes += rx->skb->len;
1465         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1466
1467         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1468                 sta->rx_stats.last_signal = status->signal;
1469                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1470         }
1471
1472         if (status->chains) {
1473                 sta->rx_stats.chains = status->chains;
1474                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1475                         int signal = status->chain_signal[i];
1476
1477                         if (!(status->chains & BIT(i)))
1478                                 continue;
1479
1480                         sta->rx_stats.chain_signal_last[i] = signal;
1481                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1482                                         -signal);
1483                 }
1484         }
1485
1486         /*
1487          * Change STA power saving mode only at the end of a frame
1488          * exchange sequence.
1489          */
1490         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1491             !ieee80211_has_morefrags(hdr->frame_control) &&
1492             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1493             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1494              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1495             /* PM bit is only checked in frames where it isn't reserved,
1496              * in AP mode it's reserved in non-bufferable management frames
1497              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1498              */
1499             (!ieee80211_is_mgmt(hdr->frame_control) ||
1500              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1501                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1502                         if (!ieee80211_has_pm(hdr->frame_control))
1503                                 sta_ps_end(sta);
1504                 } else {
1505                         if (ieee80211_has_pm(hdr->frame_control))
1506                                 sta_ps_start(sta);
1507                 }
1508         }
1509
1510         /* mesh power save support */
1511         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1512                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1513
1514         /*
1515          * Drop (qos-)data::nullfunc frames silently, since they
1516          * are used only to control station power saving mode.
1517          */
1518         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1519             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1520                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1521
1522                 /*
1523                  * If we receive a 4-addr nullfunc frame from a STA
1524                  * that was not moved to a 4-addr STA vlan yet send
1525                  * the event to userspace and for older hostapd drop
1526                  * the frame to the monitor interface.
1527                  */
1528                 if (ieee80211_has_a4(hdr->frame_control) &&
1529                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1530                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1531                       !rx->sdata->u.vlan.sta))) {
1532                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1533                                 cfg80211_rx_unexpected_4addr_frame(
1534                                         rx->sdata->dev, sta->sta.addr,
1535                                         GFP_ATOMIC);
1536                         return RX_DROP_MONITOR;
1537                 }
1538                 /*
1539                  * Update counter and free packet here to avoid
1540                  * counting this as a dropped packed.
1541                  */
1542                 sta->rx_stats.packets++;
1543                 dev_kfree_skb(rx->skb);
1544                 return RX_QUEUED;
1545         }
1546
1547         return RX_CONTINUE;
1548 } /* ieee80211_rx_h_sta_process */
1549
1550 static ieee80211_rx_result debug_noinline
1551 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1552 {
1553         struct sk_buff *skb = rx->skb;
1554         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1555         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1556         int keyidx;
1557         int hdrlen;
1558         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1559         struct ieee80211_key *sta_ptk = NULL;
1560         int mmie_keyidx = -1;
1561         __le16 fc;
1562         const struct ieee80211_cipher_scheme *cs = NULL;
1563
1564         /*
1565          * Key selection 101
1566          *
1567          * There are four types of keys:
1568          *  - GTK (group keys)
1569          *  - IGTK (group keys for management frames)
1570          *  - PTK (pairwise keys)
1571          *  - STK (station-to-station pairwise keys)
1572          *
1573          * When selecting a key, we have to distinguish between multicast
1574          * (including broadcast) and unicast frames, the latter can only
1575          * use PTKs and STKs while the former always use GTKs and IGTKs.
1576          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1577          * unicast frames can also use key indices like GTKs. Hence, if we
1578          * don't have a PTK/STK we check the key index for a WEP key.
1579          *
1580          * Note that in a regular BSS, multicast frames are sent by the
1581          * AP only, associated stations unicast the frame to the AP first
1582          * which then multicasts it on their behalf.
1583          *
1584          * There is also a slight problem in IBSS mode: GTKs are negotiated
1585          * with each station, that is something we don't currently handle.
1586          * The spec seems to expect that one negotiates the same key with
1587          * every station but there's no such requirement; VLANs could be
1588          * possible.
1589          */
1590
1591         /* start without a key */
1592         rx->key = NULL;
1593         fc = hdr->frame_control;
1594
1595         if (rx->sta) {
1596                 int keyid = rx->sta->ptk_idx;
1597
1598                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1599                         cs = rx->sta->cipher_scheme;
1600                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1601                         if (unlikely(keyid < 0))
1602                                 return RX_DROP_UNUSABLE;
1603                 }
1604                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1605         }
1606
1607         if (!ieee80211_has_protected(fc))
1608                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1609
1610         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1611                 rx->key = sta_ptk;
1612                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1613                     (status->flag & RX_FLAG_IV_STRIPPED))
1614                         return RX_CONTINUE;
1615                 /* Skip decryption if the frame is not protected. */
1616                 if (!ieee80211_has_protected(fc))
1617                         return RX_CONTINUE;
1618         } else if (mmie_keyidx >= 0) {
1619                 /* Broadcast/multicast robust management frame / BIP */
1620                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1621                     (status->flag & RX_FLAG_IV_STRIPPED))
1622                         return RX_CONTINUE;
1623
1624                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1625                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1626                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1627                 if (rx->sta) {
1628                         if (ieee80211_is_group_privacy_action(skb) &&
1629                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1630                                 return RX_DROP_MONITOR;
1631
1632                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1633                 }
1634                 if (!rx->key)
1635                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1636         } else if (!ieee80211_has_protected(fc)) {
1637                 /*
1638                  * The frame was not protected, so skip decryption. However, we
1639                  * need to set rx->key if there is a key that could have been
1640                  * used so that the frame may be dropped if encryption would
1641                  * have been expected.
1642                  */
1643                 struct ieee80211_key *key = NULL;
1644                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1645                 int i;
1646
1647                 if (ieee80211_is_mgmt(fc) &&
1648                     is_multicast_ether_addr(hdr->addr1) &&
1649                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1650                         rx->key = key;
1651                 else {
1652                         if (rx->sta) {
1653                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1654                                         key = rcu_dereference(rx->sta->gtk[i]);
1655                                         if (key)
1656                                                 break;
1657                                 }
1658                         }
1659                         if (!key) {
1660                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1661                                         key = rcu_dereference(sdata->keys[i]);
1662                                         if (key)
1663                                                 break;
1664                                 }
1665                         }
1666                         if (key)
1667                                 rx->key = key;
1668                 }
1669                 return RX_CONTINUE;
1670         } else {
1671                 u8 keyid;
1672
1673                 /*
1674                  * The device doesn't give us the IV so we won't be
1675                  * able to look up the key. That's ok though, we
1676                  * don't need to decrypt the frame, we just won't
1677                  * be able to keep statistics accurate.
1678                  * Except for key threshold notifications, should
1679                  * we somehow allow the driver to tell us which key
1680                  * the hardware used if this flag is set?
1681                  */
1682                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1683                     (status->flag & RX_FLAG_IV_STRIPPED))
1684                         return RX_CONTINUE;
1685
1686                 hdrlen = ieee80211_hdrlen(fc);
1687
1688                 if (cs) {
1689                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1690
1691                         if (unlikely(keyidx < 0))
1692                                 return RX_DROP_UNUSABLE;
1693                 } else {
1694                         if (rx->skb->len < 8 + hdrlen)
1695                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1696                         /*
1697                          * no need to call ieee80211_wep_get_keyidx,
1698                          * it verifies a bunch of things we've done already
1699                          */
1700                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1701                         keyidx = keyid >> 6;
1702                 }
1703
1704                 /* check per-station GTK first, if multicast packet */
1705                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1706                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1707
1708                 /* if not found, try default key */
1709                 if (!rx->key) {
1710                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1711
1712                         /*
1713                          * RSNA-protected unicast frames should always be
1714                          * sent with pairwise or station-to-station keys,
1715                          * but for WEP we allow using a key index as well.
1716                          */
1717                         if (rx->key &&
1718                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1719                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1720                             !is_multicast_ether_addr(hdr->addr1))
1721                                 rx->key = NULL;
1722                 }
1723         }
1724
1725         if (rx->key) {
1726                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1727                         return RX_DROP_MONITOR;
1728
1729                 /* TODO: add threshold stuff again */
1730         } else {
1731                 return RX_DROP_MONITOR;
1732         }
1733
1734         switch (rx->key->conf.cipher) {
1735         case WLAN_CIPHER_SUITE_WEP40:
1736         case WLAN_CIPHER_SUITE_WEP104:
1737                 result = ieee80211_crypto_wep_decrypt(rx);
1738                 break;
1739         case WLAN_CIPHER_SUITE_TKIP:
1740                 result = ieee80211_crypto_tkip_decrypt(rx);
1741                 break;
1742         case WLAN_CIPHER_SUITE_CCMP:
1743                 result = ieee80211_crypto_ccmp_decrypt(
1744                         rx, IEEE80211_CCMP_MIC_LEN);
1745                 break;
1746         case WLAN_CIPHER_SUITE_CCMP_256:
1747                 result = ieee80211_crypto_ccmp_decrypt(
1748                         rx, IEEE80211_CCMP_256_MIC_LEN);
1749                 break;
1750         case WLAN_CIPHER_SUITE_AES_CMAC:
1751                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1752                 break;
1753         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1754                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1755                 break;
1756         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1757         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1758                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1759                 break;
1760         case WLAN_CIPHER_SUITE_GCMP:
1761         case WLAN_CIPHER_SUITE_GCMP_256:
1762                 result = ieee80211_crypto_gcmp_decrypt(rx);
1763                 break;
1764         default:
1765                 result = ieee80211_crypto_hw_decrypt(rx);
1766         }
1767
1768         /* the hdr variable is invalid after the decrypt handlers */
1769
1770         /* either the frame has been decrypted or will be dropped */
1771         status->flag |= RX_FLAG_DECRYPTED;
1772
1773         return result;
1774 }
1775
1776 static inline struct ieee80211_fragment_entry *
1777 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1778                          unsigned int frag, unsigned int seq, int rx_queue,
1779                          struct sk_buff **skb)
1780 {
1781         struct ieee80211_fragment_entry *entry;
1782
1783         entry = &sdata->fragments[sdata->fragment_next++];
1784         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1785                 sdata->fragment_next = 0;
1786
1787         if (!skb_queue_empty(&entry->skb_list))
1788                 __skb_queue_purge(&entry->skb_list);
1789
1790         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1791         *skb = NULL;
1792         entry->first_frag_time = jiffies;
1793         entry->seq = seq;
1794         entry->rx_queue = rx_queue;
1795         entry->last_frag = frag;
1796         entry->check_sequential_pn = false;
1797         entry->extra_len = 0;
1798
1799         return entry;
1800 }
1801
1802 static inline struct ieee80211_fragment_entry *
1803 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1804                           unsigned int frag, unsigned int seq,
1805                           int rx_queue, struct ieee80211_hdr *hdr)
1806 {
1807         struct ieee80211_fragment_entry *entry;
1808         int i, idx;
1809
1810         idx = sdata->fragment_next;
1811         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1812                 struct ieee80211_hdr *f_hdr;
1813
1814                 idx--;
1815                 if (idx < 0)
1816                         idx = IEEE80211_FRAGMENT_MAX - 1;
1817
1818                 entry = &sdata->fragments[idx];
1819                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1820                     entry->rx_queue != rx_queue ||
1821                     entry->last_frag + 1 != frag)
1822                         continue;
1823
1824                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1825
1826                 /*
1827                  * Check ftype and addresses are equal, else check next fragment
1828                  */
1829                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1830                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1831                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1832                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1833                         continue;
1834
1835                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1836                         __skb_queue_purge(&entry->skb_list);
1837                         continue;
1838                 }
1839                 return entry;
1840         }
1841
1842         return NULL;
1843 }
1844
1845 static ieee80211_rx_result debug_noinline
1846 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1847 {
1848         struct ieee80211_hdr *hdr;
1849         u16 sc;
1850         __le16 fc;
1851         unsigned int frag, seq;
1852         struct ieee80211_fragment_entry *entry;
1853         struct sk_buff *skb;
1854         struct ieee80211_rx_status *status;
1855
1856         hdr = (struct ieee80211_hdr *)rx->skb->data;
1857         fc = hdr->frame_control;
1858
1859         if (ieee80211_is_ctl(fc))
1860                 return RX_CONTINUE;
1861
1862         sc = le16_to_cpu(hdr->seq_ctrl);
1863         frag = sc & IEEE80211_SCTL_FRAG;
1864
1865         if (is_multicast_ether_addr(hdr->addr1)) {
1866                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1867                 goto out_no_led;
1868         }
1869
1870         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1871                 goto out;
1872
1873         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1874
1875         if (skb_linearize(rx->skb))
1876                 return RX_DROP_UNUSABLE;
1877
1878         /*
1879          *  skb_linearize() might change the skb->data and
1880          *  previously cached variables (in this case, hdr) need to
1881          *  be refreshed with the new data.
1882          */
1883         hdr = (struct ieee80211_hdr *)rx->skb->data;
1884         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1885
1886         if (frag == 0) {
1887                 /* This is the first fragment of a new frame. */
1888                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1889                                                  rx->seqno_idx, &(rx->skb));
1890                 if (rx->key &&
1891                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1892                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1893                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1894                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1895                     ieee80211_has_protected(fc)) {
1896                         int queue = rx->security_idx;
1897
1898                         /* Store CCMP/GCMP PN so that we can verify that the
1899                          * next fragment has a sequential PN value.
1900                          */
1901                         entry->check_sequential_pn = true;
1902                         memcpy(entry->last_pn,
1903                                rx->key->u.ccmp.rx_pn[queue],
1904                                IEEE80211_CCMP_PN_LEN);
1905                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1906                                               u.ccmp.rx_pn) !=
1907                                      offsetof(struct ieee80211_key,
1908                                               u.gcmp.rx_pn));
1909                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1910                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1911                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1912                                      IEEE80211_GCMP_PN_LEN);
1913                 }
1914                 return RX_QUEUED;
1915         }
1916
1917         /* This is a fragment for a frame that should already be pending in
1918          * fragment cache. Add this fragment to the end of the pending entry.
1919          */
1920         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1921                                           rx->seqno_idx, hdr);
1922         if (!entry) {
1923                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1924                 return RX_DROP_MONITOR;
1925         }
1926
1927         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1928          *  MPDU PN values are not incrementing in steps of 1."
1929          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1930          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1931          */
1932         if (entry->check_sequential_pn) {
1933                 int i;
1934                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1935                 int queue;
1936
1937                 if (!rx->key ||
1938                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1939                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1940                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1941                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1942                         return RX_DROP_UNUSABLE;
1943                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1944                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1945                         pn[i]++;
1946                         if (pn[i])
1947                                 break;
1948                 }
1949                 queue = rx->security_idx;
1950                 rpn = rx->key->u.ccmp.rx_pn[queue];
1951                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1952                         return RX_DROP_UNUSABLE;
1953                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1954         }
1955
1956         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1957         __skb_queue_tail(&entry->skb_list, rx->skb);
1958         entry->last_frag = frag;
1959         entry->extra_len += rx->skb->len;
1960         if (ieee80211_has_morefrags(fc)) {
1961                 rx->skb = NULL;
1962                 return RX_QUEUED;
1963         }
1964
1965         rx->skb = __skb_dequeue(&entry->skb_list);
1966         if (skb_tailroom(rx->skb) < entry->extra_len) {
1967                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1968                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1969                                               GFP_ATOMIC))) {
1970                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1971                         __skb_queue_purge(&entry->skb_list);
1972                         return RX_DROP_UNUSABLE;
1973                 }
1974         }
1975         while ((skb = __skb_dequeue(&entry->skb_list))) {
1976                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1977                 dev_kfree_skb(skb);
1978         }
1979
1980         /* Complete frame has been reassembled - process it now */
1981         status = IEEE80211_SKB_RXCB(rx->skb);
1982
1983  out:
1984         ieee80211_led_rx(rx->local);
1985  out_no_led:
1986         if (rx->sta)
1987                 rx->sta->rx_stats.packets++;
1988         return RX_CONTINUE;
1989 }
1990
1991 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1992 {
1993         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1994                 return -EACCES;
1995
1996         return 0;
1997 }
1998
1999 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2000 {
2001         struct sk_buff *skb = rx->skb;
2002         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2003
2004         /*
2005          * Pass through unencrypted frames if the hardware has
2006          * decrypted them already.
2007          */
2008         if (status->flag & RX_FLAG_DECRYPTED)
2009                 return 0;
2010
2011         /* Drop unencrypted frames if key is set. */
2012         if (unlikely(!ieee80211_has_protected(fc) &&
2013                      !ieee80211_is_nullfunc(fc) &&
2014                      ieee80211_is_data(fc) && rx->key))
2015                 return -EACCES;
2016
2017         return 0;
2018 }
2019
2020 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2021 {
2022         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2023         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2024         __le16 fc = hdr->frame_control;
2025
2026         /*
2027          * Pass through unencrypted frames if the hardware has
2028          * decrypted them already.
2029          */
2030         if (status->flag & RX_FLAG_DECRYPTED)
2031                 return 0;
2032
2033         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2034                 if (unlikely(!ieee80211_has_protected(fc) &&
2035                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2036                              rx->key)) {
2037                         if (ieee80211_is_deauth(fc) ||
2038                             ieee80211_is_disassoc(fc))
2039                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2040                                                              rx->skb->data,
2041                                                              rx->skb->len);
2042                         return -EACCES;
2043                 }
2044                 /* BIP does not use Protected field, so need to check MMIE */
2045                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2046                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2047                         if (ieee80211_is_deauth(fc) ||
2048                             ieee80211_is_disassoc(fc))
2049                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2050                                                              rx->skb->data,
2051                                                              rx->skb->len);
2052                         return -EACCES;
2053                 }
2054                 /*
2055                  * When using MFP, Action frames are not allowed prior to
2056                  * having configured keys.
2057                  */
2058                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2059                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2060                         return -EACCES;
2061         }
2062
2063         return 0;
2064 }
2065
2066 static int
2067 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2068 {
2069         struct ieee80211_sub_if_data *sdata = rx->sdata;
2070         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2071         bool check_port_control = false;
2072         struct ethhdr *ehdr;
2073         int ret;
2074
2075         *port_control = false;
2076         if (ieee80211_has_a4(hdr->frame_control) &&
2077             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2078                 return -1;
2079
2080         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2081             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2082
2083                 if (!sdata->u.mgd.use_4addr)
2084                         return -1;
2085                 else
2086                         check_port_control = true;
2087         }
2088
2089         if (is_multicast_ether_addr(hdr->addr1) &&
2090             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2091                 return -1;
2092
2093         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2094         if (ret < 0)
2095                 return ret;
2096
2097         ehdr = (struct ethhdr *) rx->skb->data;
2098         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2099                 *port_control = true;
2100         else if (check_port_control)
2101                 return -1;
2102
2103         return 0;
2104 }
2105
2106 /*
2107  * requires that rx->skb is a frame with ethernet header
2108  */
2109 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2110 {
2111         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2112                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2113         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2114
2115         /*
2116          * Allow EAPOL frames to us/the PAE group address regardless
2117          * of whether the frame was encrypted or not.
2118          */
2119         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2120             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2121              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2122                 return true;
2123
2124         if (ieee80211_802_1x_port_control(rx) ||
2125             ieee80211_drop_unencrypted(rx, fc))
2126                 return false;
2127
2128         return true;
2129 }
2130
2131 /*
2132  * requires that rx->skb is a frame with ethernet header
2133  */
2134 static void
2135 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2136 {
2137         struct ieee80211_sub_if_data *sdata = rx->sdata;
2138         struct net_device *dev = sdata->dev;
2139         struct sk_buff *skb, *xmit_skb;
2140         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2141         struct sta_info *dsta;
2142
2143         skb = rx->skb;
2144         xmit_skb = NULL;
2145
2146         ieee80211_rx_stats(dev, skb->len);
2147
2148         if (rx->sta) {
2149                 /* The seqno index has the same property as needed
2150                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2151                  * for non-QoS-data frames. Here we know it's a data
2152                  * frame, so count MSDUs.
2153                  */
2154                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2155                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2156                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2157         }
2158
2159         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2160              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2161             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2162             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2163                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2164                         /*
2165                          * send multicast frames both to higher layers in
2166                          * local net stack and back to the wireless medium
2167                          */
2168                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2169                         if (!xmit_skb)
2170                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2171                                                     dev->name);
2172                 } else {
2173                         dsta = sta_info_get(sdata, skb->data);
2174                         if (dsta) {
2175                                 /*
2176                                  * The destination station is associated to
2177                                  * this AP (in this VLAN), so send the frame
2178                                  * directly to it and do not pass it to local
2179                                  * net stack.
2180                                  */
2181                                 xmit_skb = skb;
2182                                 skb = NULL;
2183                         }
2184                 }
2185         }
2186
2187 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2188         if (skb) {
2189                 /* 'align' will only take the values 0 or 2 here since all
2190                  * frames are required to be aligned to 2-byte boundaries
2191                  * when being passed to mac80211; the code here works just
2192                  * as well if that isn't true, but mac80211 assumes it can
2193                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2194                  */
2195                 int align;
2196
2197                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2198                 if (align) {
2199                         if (WARN_ON(skb_headroom(skb) < 3)) {
2200                                 dev_kfree_skb(skb);
2201                                 skb = NULL;
2202                         } else {
2203                                 u8 *data = skb->data;
2204                                 size_t len = skb_headlen(skb);
2205                                 skb->data -= align;
2206                                 memmove(skb->data, data, len);
2207                                 skb_set_tail_pointer(skb, len);
2208                         }
2209                 }
2210         }
2211 #endif
2212
2213         if (skb) {
2214                 /* deliver to local stack */
2215                 skb->protocol = eth_type_trans(skb, dev);
2216                 memset(skb->cb, 0, sizeof(skb->cb));
2217                 if (rx->napi)
2218                         napi_gro_receive(rx->napi, skb);
2219                 else
2220                         netif_receive_skb(skb);
2221         }
2222
2223         if (xmit_skb) {
2224                 /*
2225                  * Send to wireless media and increase priority by 256 to
2226                  * keep the received priority instead of reclassifying
2227                  * the frame (see cfg80211_classify8021d).
2228                  */
2229                 xmit_skb->priority += 256;
2230                 xmit_skb->protocol = htons(ETH_P_802_3);
2231                 skb_reset_network_header(xmit_skb);
2232                 skb_reset_mac_header(xmit_skb);
2233                 dev_queue_xmit(xmit_skb);
2234         }
2235 }
2236
2237 static ieee80211_rx_result debug_noinline
2238 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2239 {
2240         struct net_device *dev = rx->sdata->dev;
2241         struct sk_buff *skb = rx->skb;
2242         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2243         __le16 fc = hdr->frame_control;
2244         struct sk_buff_head frame_list;
2245         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2246
2247         if (unlikely(!ieee80211_is_data(fc)))
2248                 return RX_CONTINUE;
2249
2250         if (unlikely(!ieee80211_is_data_present(fc)))
2251                 return RX_DROP_MONITOR;
2252
2253         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2254                 return RX_CONTINUE;
2255
2256         if (ieee80211_has_a4(hdr->frame_control) &&
2257             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2258             !rx->sdata->u.vlan.sta)
2259                 return RX_DROP_UNUSABLE;
2260
2261         if (is_multicast_ether_addr(hdr->addr1) &&
2262             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2263               rx->sdata->u.vlan.sta) ||
2264              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2265               rx->sdata->u.mgd.use_4addr)))
2266                 return RX_DROP_UNUSABLE;
2267
2268         skb->dev = dev;
2269         __skb_queue_head_init(&frame_list);
2270
2271         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2272                                  rx->sdata->vif.type,
2273                                  rx->local->hw.extra_tx_headroom, true);
2274
2275         while (!skb_queue_empty(&frame_list)) {
2276                 rx->skb = __skb_dequeue(&frame_list);
2277
2278                 if (!ieee80211_frame_allowed(rx, fc)) {
2279                         dev_kfree_skb(rx->skb);
2280                         continue;
2281                 }
2282
2283                 ieee80211_deliver_skb(rx);
2284         }
2285
2286         return RX_QUEUED;
2287 }
2288
2289 #ifdef CONFIG_MAC80211_MESH
2290 static ieee80211_rx_result
2291 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2292 {
2293         struct ieee80211_hdr *fwd_hdr, *hdr;
2294         struct ieee80211_tx_info *info;
2295         struct ieee80211s_hdr *mesh_hdr;
2296         struct sk_buff *skb = rx->skb, *fwd_skb;
2297         struct ieee80211_local *local = rx->local;
2298         struct ieee80211_sub_if_data *sdata = rx->sdata;
2299         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2300         u16 ac, q, hdrlen;
2301
2302         hdr = (struct ieee80211_hdr *) skb->data;
2303         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2304
2305         /* make sure fixed part of mesh header is there, also checks skb len */
2306         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2307                 return RX_DROP_MONITOR;
2308
2309         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2310
2311         /* make sure full mesh header is there, also checks skb len */
2312         if (!pskb_may_pull(rx->skb,
2313                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2314                 return RX_DROP_MONITOR;
2315
2316         /* reload pointers */
2317         hdr = (struct ieee80211_hdr *) skb->data;
2318         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2319
2320         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2321                 return RX_DROP_MONITOR;
2322
2323         /* frame is in RMC, don't forward */
2324         if (ieee80211_is_data(hdr->frame_control) &&
2325             is_multicast_ether_addr(hdr->addr1) &&
2326             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2327                 return RX_DROP_MONITOR;
2328
2329         if (!ieee80211_is_data(hdr->frame_control))
2330                 return RX_CONTINUE;
2331
2332         if (!mesh_hdr->ttl)
2333                 return RX_DROP_MONITOR;
2334
2335         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2336                 struct mesh_path *mppath;
2337                 char *proxied_addr;
2338                 char *mpp_addr;
2339
2340                 if (is_multicast_ether_addr(hdr->addr1)) {
2341                         mpp_addr = hdr->addr3;
2342                         proxied_addr = mesh_hdr->eaddr1;
2343                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2344                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2345                         mpp_addr = hdr->addr4;
2346                         proxied_addr = mesh_hdr->eaddr2;
2347                 } else {
2348                         return RX_DROP_MONITOR;
2349                 }
2350
2351                 rcu_read_lock();
2352                 mppath = mpp_path_lookup(sdata, proxied_addr);
2353                 if (!mppath) {
2354                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2355                 } else {
2356                         spin_lock_bh(&mppath->state_lock);
2357                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2358                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2359                         mppath->exp_time = jiffies;
2360                         spin_unlock_bh(&mppath->state_lock);
2361                 }
2362                 rcu_read_unlock();
2363         }
2364
2365         /* Frame has reached destination.  Don't forward */
2366         if (!is_multicast_ether_addr(hdr->addr1) &&
2367             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2368                 return RX_CONTINUE;
2369
2370         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2371         q = sdata->vif.hw_queue[ac];
2372         if (ieee80211_queue_stopped(&local->hw, q)) {
2373                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2374                 return RX_DROP_MONITOR;
2375         }
2376         skb_set_queue_mapping(skb, q);
2377
2378         if (!--mesh_hdr->ttl) {
2379                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2380                 goto out;
2381         }
2382
2383         if (!ifmsh->mshcfg.dot11MeshForwarding)
2384                 goto out;
2385
2386         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2387         if (!fwd_skb) {
2388                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2389                                     sdata->name);
2390                 goto out;
2391         }
2392
2393         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2394         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2395         info = IEEE80211_SKB_CB(fwd_skb);
2396         memset(info, 0, sizeof(*info));
2397         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2398         info->control.vif = &rx->sdata->vif;
2399         info->control.jiffies = jiffies;
2400         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2401                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2402                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2403                 /* update power mode indication when forwarding */
2404                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2405         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2406                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2407                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2408         } else {
2409                 /* unable to resolve next hop */
2410                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2411                                    fwd_hdr->addr3, 0,
2412                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2413                                    fwd_hdr->addr2);
2414                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2415                 kfree_skb(fwd_skb);
2416                 return RX_DROP_MONITOR;
2417         }
2418
2419         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2420         ieee80211_add_pending_skb(local, fwd_skb);
2421  out:
2422         if (is_multicast_ether_addr(hdr->addr1))
2423                 return RX_CONTINUE;
2424         return RX_DROP_MONITOR;
2425 }
2426 #endif
2427
2428 static ieee80211_rx_result debug_noinline
2429 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2430 {
2431         struct ieee80211_sub_if_data *sdata = rx->sdata;
2432         struct ieee80211_local *local = rx->local;
2433         struct net_device *dev = sdata->dev;
2434         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2435         __le16 fc = hdr->frame_control;
2436         bool port_control;
2437         int err;
2438
2439         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2440                 return RX_CONTINUE;
2441
2442         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2443                 return RX_DROP_MONITOR;
2444
2445         /*
2446          * Send unexpected-4addr-frame event to hostapd. For older versions,
2447          * also drop the frame to cooked monitor interfaces.
2448          */
2449         if (ieee80211_has_a4(hdr->frame_control) &&
2450             sdata->vif.type == NL80211_IFTYPE_AP) {
2451                 if (rx->sta &&
2452                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2453                         cfg80211_rx_unexpected_4addr_frame(
2454                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2455                 return RX_DROP_MONITOR;
2456         }
2457
2458         err = __ieee80211_data_to_8023(rx, &port_control);
2459         if (unlikely(err))
2460                 return RX_DROP_UNUSABLE;
2461
2462         if (!ieee80211_frame_allowed(rx, fc))
2463                 return RX_DROP_MONITOR;
2464
2465         /* directly handle TDLS channel switch requests/responses */
2466         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2467                                                 cpu_to_be16(ETH_P_TDLS))) {
2468                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2469
2470                 if (pskb_may_pull(rx->skb,
2471                                   offsetof(struct ieee80211_tdls_data, u)) &&
2472                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2473                     tf->category == WLAN_CATEGORY_TDLS &&
2474                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2475                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2476                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2477                         schedule_work(&local->tdls_chsw_work);
2478                         if (rx->sta)
2479                                 rx->sta->rx_stats.packets++;
2480
2481                         return RX_QUEUED;
2482                 }
2483         }
2484
2485         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2486             unlikely(port_control) && sdata->bss) {
2487                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2488                                      u.ap);
2489                 dev = sdata->dev;
2490                 rx->sdata = sdata;
2491         }
2492
2493         rx->skb->dev = dev;
2494
2495         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2496             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2497             !is_multicast_ether_addr(
2498                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2499             (!local->scanning &&
2500              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2501                 mod_timer(&local->dynamic_ps_timer, jiffies +
2502                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2503
2504         ieee80211_deliver_skb(rx);
2505
2506         return RX_QUEUED;
2507 }
2508
2509 static ieee80211_rx_result debug_noinline
2510 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2511 {
2512         struct sk_buff *skb = rx->skb;
2513         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2514         struct tid_ampdu_rx *tid_agg_rx;
2515         u16 start_seq_num;
2516         u16 tid;
2517
2518         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2519                 return RX_CONTINUE;
2520
2521         if (ieee80211_is_back_req(bar->frame_control)) {
2522                 struct {
2523                         __le16 control, start_seq_num;
2524                 } __packed bar_data;
2525                 struct ieee80211_event event = {
2526                         .type = BAR_RX_EVENT,
2527                 };
2528
2529                 if (!rx->sta)
2530                         return RX_DROP_MONITOR;
2531
2532                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2533                                   &bar_data, sizeof(bar_data)))
2534                         return RX_DROP_MONITOR;
2535
2536                 tid = le16_to_cpu(bar_data.control) >> 12;
2537
2538                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2539                 if (!tid_agg_rx)
2540                         return RX_DROP_MONITOR;
2541
2542                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2543                 event.u.ba.tid = tid;
2544                 event.u.ba.ssn = start_seq_num;
2545                 event.u.ba.sta = &rx->sta->sta;
2546
2547                 /* reset session timer */
2548                 if (tid_agg_rx->timeout)
2549                         mod_timer(&tid_agg_rx->session_timer,
2550                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2551
2552                 spin_lock(&tid_agg_rx->reorder_lock);
2553                 /* release stored frames up to start of BAR */
2554                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2555                                                  start_seq_num, frames);
2556                 spin_unlock(&tid_agg_rx->reorder_lock);
2557
2558                 drv_event_callback(rx->local, rx->sdata, &event);
2559
2560                 kfree_skb(skb);
2561                 return RX_QUEUED;
2562         }
2563
2564         /*
2565          * After this point, we only want management frames,
2566          * so we can drop all remaining control frames to
2567          * cooked monitor interfaces.
2568          */
2569         return RX_DROP_MONITOR;
2570 }
2571
2572 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2573                                            struct ieee80211_mgmt *mgmt,
2574                                            size_t len)
2575 {
2576         struct ieee80211_local *local = sdata->local;
2577         struct sk_buff *skb;
2578         struct ieee80211_mgmt *resp;
2579
2580         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2581                 /* Not to own unicast address */
2582                 return;
2583         }
2584
2585         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2586             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2587                 /* Not from the current AP or not associated yet. */
2588                 return;
2589         }
2590
2591         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2592                 /* Too short SA Query request frame */
2593                 return;
2594         }
2595
2596         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2597         if (skb == NULL)
2598                 return;
2599
2600         skb_reserve(skb, local->hw.extra_tx_headroom);
2601         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2602         memset(resp, 0, 24);
2603         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2604         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2605         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2606         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2607                                           IEEE80211_STYPE_ACTION);
2608         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2609         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2610         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2611         memcpy(resp->u.action.u.sa_query.trans_id,
2612                mgmt->u.action.u.sa_query.trans_id,
2613                WLAN_SA_QUERY_TR_ID_LEN);
2614
2615         ieee80211_tx_skb(sdata, skb);
2616 }
2617
2618 static ieee80211_rx_result debug_noinline
2619 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2620 {
2621         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2622         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2623
2624         /*
2625          * From here on, look only at management frames.
2626          * Data and control frames are already handled,
2627          * and unknown (reserved) frames are useless.
2628          */
2629         if (rx->skb->len < 24)
2630                 return RX_DROP_MONITOR;
2631
2632         if (!ieee80211_is_mgmt(mgmt->frame_control))
2633                 return RX_DROP_MONITOR;
2634
2635         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2636             ieee80211_is_beacon(mgmt->frame_control) &&
2637             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2638                 int sig = 0;
2639
2640                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2641                         sig = status->signal;
2642
2643                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2644                                             rx->skb->data, rx->skb->len,
2645                                             status->freq, sig);
2646                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2647         }
2648
2649         if (ieee80211_drop_unencrypted_mgmt(rx))
2650                 return RX_DROP_UNUSABLE;
2651
2652         return RX_CONTINUE;
2653 }
2654
2655 static ieee80211_rx_result debug_noinline
2656 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2657 {
2658         struct ieee80211_local *local = rx->local;
2659         struct ieee80211_sub_if_data *sdata = rx->sdata;
2660         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2661         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2662         int len = rx->skb->len;
2663
2664         if (!ieee80211_is_action(mgmt->frame_control))
2665                 return RX_CONTINUE;
2666
2667         /* drop too small frames */
2668         if (len < IEEE80211_MIN_ACTION_SIZE)
2669                 return RX_DROP_UNUSABLE;
2670
2671         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2672             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2673             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2674                 return RX_DROP_UNUSABLE;
2675
2676         switch (mgmt->u.action.category) {
2677         case WLAN_CATEGORY_HT:
2678                 /* reject HT action frames from stations not supporting HT */
2679                 if (!rx->sta->sta.ht_cap.ht_supported)
2680                         goto invalid;
2681
2682                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2683                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2684                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2685                     sdata->vif.type != NL80211_IFTYPE_AP &&
2686                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2687                         break;
2688
2689                 /* verify action & smps_control/chanwidth are present */
2690                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2691                         goto invalid;
2692
2693                 switch (mgmt->u.action.u.ht_smps.action) {
2694                 case WLAN_HT_ACTION_SMPS: {
2695                         struct ieee80211_supported_band *sband;
2696                         enum ieee80211_smps_mode smps_mode;
2697
2698                         /* convert to HT capability */
2699                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2700                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2701                                 smps_mode = IEEE80211_SMPS_OFF;
2702                                 break;
2703                         case WLAN_HT_SMPS_CONTROL_STATIC:
2704                                 smps_mode = IEEE80211_SMPS_STATIC;
2705                                 break;
2706                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2707                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2708                                 break;
2709                         default:
2710                                 goto invalid;
2711                         }
2712
2713                         /* if no change do nothing */
2714                         if (rx->sta->sta.smps_mode == smps_mode)
2715                                 goto handled;
2716                         rx->sta->sta.smps_mode = smps_mode;
2717
2718                         sband = rx->local->hw.wiphy->bands[status->band];
2719
2720                         rate_control_rate_update(local, sband, rx->sta,
2721                                                  IEEE80211_RC_SMPS_CHANGED);
2722                         goto handled;
2723                 }
2724                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2725                         struct ieee80211_supported_band *sband;
2726                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2727                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2728
2729                         /* If it doesn't support 40 MHz it can't change ... */
2730                         if (!(rx->sta->sta.ht_cap.cap &
2731                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2732                                 goto handled;
2733
2734                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2735                                 max_bw = IEEE80211_STA_RX_BW_20;
2736                         else
2737                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2738
2739                         /* set cur_max_bandwidth and recalc sta bw */
2740                         rx->sta->cur_max_bandwidth = max_bw;
2741                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2742
2743                         if (rx->sta->sta.bandwidth == new_bw)
2744                                 goto handled;
2745
2746                         rx->sta->sta.bandwidth = new_bw;
2747                         sband = rx->local->hw.wiphy->bands[status->band];
2748
2749                         rate_control_rate_update(local, sband, rx->sta,
2750                                                  IEEE80211_RC_BW_CHANGED);
2751                         goto handled;
2752                 }
2753                 default:
2754                         goto invalid;
2755                 }
2756
2757                 break;
2758         case WLAN_CATEGORY_PUBLIC:
2759                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2760                         goto invalid;
2761                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2762                         break;
2763                 if (!rx->sta)
2764                         break;
2765                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2766                         break;
2767                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2768                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2769                         break;
2770                 if (len < offsetof(struct ieee80211_mgmt,
2771                                    u.action.u.ext_chan_switch.variable))
2772                         goto invalid;
2773                 goto queue;
2774         case WLAN_CATEGORY_VHT:
2775                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2776                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2777                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2778                     sdata->vif.type != NL80211_IFTYPE_AP &&
2779                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2780                         break;
2781
2782                 /* verify action code is present */
2783                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2784                         goto invalid;
2785
2786                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2787                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2788                         u8 opmode;
2789
2790                         /* verify opmode is present */
2791                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2792                                 goto invalid;
2793
2794                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2795
2796                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2797                                                     opmode, status->band);
2798                         goto handled;
2799                 }
2800                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2801                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2802                                 goto invalid;
2803                         goto queue;
2804                 }
2805                 default:
2806                         break;
2807                 }
2808                 break;
2809         case WLAN_CATEGORY_BACK:
2810                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2811                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2812                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2813                     sdata->vif.type != NL80211_IFTYPE_AP &&
2814                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2815                         break;
2816
2817                 /* verify action_code is present */
2818                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2819                         break;
2820
2821                 switch (mgmt->u.action.u.addba_req.action_code) {
2822                 case WLAN_ACTION_ADDBA_REQ:
2823                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2824                                    sizeof(mgmt->u.action.u.addba_req)))
2825                                 goto invalid;
2826                         break;
2827                 case WLAN_ACTION_ADDBA_RESP:
2828                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2829                                    sizeof(mgmt->u.action.u.addba_resp)))
2830                                 goto invalid;
2831                         break;
2832                 case WLAN_ACTION_DELBA:
2833                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2834                                    sizeof(mgmt->u.action.u.delba)))
2835                                 goto invalid;
2836                         break;
2837                 default:
2838                         goto invalid;
2839                 }
2840
2841                 goto queue;
2842         case WLAN_CATEGORY_SPECTRUM_MGMT:
2843                 /* verify action_code is present */
2844                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2845                         break;
2846
2847                 switch (mgmt->u.action.u.measurement.action_code) {
2848                 case WLAN_ACTION_SPCT_MSR_REQ:
2849                         if (status->band != NL80211_BAND_5GHZ)
2850                                 break;
2851
2852                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2853                                    sizeof(mgmt->u.action.u.measurement)))
2854                                 break;
2855
2856                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2857                                 break;
2858
2859                         ieee80211_process_measurement_req(sdata, mgmt, len);
2860                         goto handled;
2861                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2862                         u8 *bssid;
2863                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2864                                    sizeof(mgmt->u.action.u.chan_switch)))
2865                                 break;
2866
2867                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2868                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2869                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2870                                 break;
2871
2872                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2873                                 bssid = sdata->u.mgd.bssid;
2874                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2875                                 bssid = sdata->u.ibss.bssid;
2876                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2877                                 bssid = mgmt->sa;
2878                         else
2879                                 break;
2880
2881                         if (!ether_addr_equal(mgmt->bssid, bssid))
2882                                 break;
2883
2884                         goto queue;
2885                         }
2886                 }
2887                 break;
2888         case WLAN_CATEGORY_SA_QUERY:
2889                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2890                            sizeof(mgmt->u.action.u.sa_query)))
2891                         break;
2892
2893                 switch (mgmt->u.action.u.sa_query.action) {
2894                 case WLAN_ACTION_SA_QUERY_REQUEST:
2895                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2896                                 break;
2897                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2898                         goto handled;
2899                 }
2900                 break;
2901         case WLAN_CATEGORY_SELF_PROTECTED:
2902                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2903                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2904                         break;
2905
2906                 switch (mgmt->u.action.u.self_prot.action_code) {
2907                 case WLAN_SP_MESH_PEERING_OPEN:
2908                 case WLAN_SP_MESH_PEERING_CLOSE:
2909                 case WLAN_SP_MESH_PEERING_CONFIRM:
2910                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2911                                 goto invalid;
2912                         if (sdata->u.mesh.user_mpm)
2913                                 /* userspace handles this frame */
2914                                 break;
2915                         goto queue;
2916                 case WLAN_SP_MGK_INFORM:
2917                 case WLAN_SP_MGK_ACK:
2918                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2919                                 goto invalid;
2920                         break;
2921                 }
2922                 break;
2923         case WLAN_CATEGORY_MESH_ACTION:
2924                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2925                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2926                         break;
2927
2928                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2929                         break;
2930                 if (mesh_action_is_path_sel(mgmt) &&
2931                     !mesh_path_sel_is_hwmp(sdata))
2932                         break;
2933                 goto queue;
2934         }
2935
2936         return RX_CONTINUE;
2937
2938  invalid:
2939         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2940         /* will return in the next handlers */
2941         return RX_CONTINUE;
2942
2943  handled:
2944         if (rx->sta)
2945                 rx->sta->rx_stats.packets++;
2946         dev_kfree_skb(rx->skb);
2947         return RX_QUEUED;
2948
2949  queue:
2950         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2951         skb_queue_tail(&sdata->skb_queue, rx->skb);
2952         ieee80211_queue_work(&local->hw, &sdata->work);
2953         if (rx->sta)
2954                 rx->sta->rx_stats.packets++;
2955         return RX_QUEUED;
2956 }
2957
2958 static ieee80211_rx_result debug_noinline
2959 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2960 {
2961         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2962         int sig = 0;
2963
2964         /* skip known-bad action frames and return them in the next handler */
2965         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2966                 return RX_CONTINUE;
2967
2968         /*
2969          * Getting here means the kernel doesn't know how to handle
2970          * it, but maybe userspace does ... include returned frames
2971          * so userspace can register for those to know whether ones
2972          * it transmitted were processed or returned.
2973          */
2974
2975         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2976                 sig = status->signal;
2977
2978         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2979                              rx->skb->data, rx->skb->len, 0)) {
2980                 if (rx->sta)
2981                         rx->sta->rx_stats.packets++;
2982                 dev_kfree_skb(rx->skb);
2983                 return RX_QUEUED;
2984         }
2985
2986         return RX_CONTINUE;
2987 }
2988
2989 static ieee80211_rx_result debug_noinline
2990 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2991 {
2992         struct ieee80211_local *local = rx->local;
2993         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2994         struct sk_buff *nskb;
2995         struct ieee80211_sub_if_data *sdata = rx->sdata;
2996         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2997
2998         if (!ieee80211_is_action(mgmt->frame_control))
2999                 return RX_CONTINUE;
3000
3001         /*
3002          * For AP mode, hostapd is responsible for handling any action
3003          * frames that we didn't handle, including returning unknown
3004          * ones. For all other modes we will return them to the sender,
3005          * setting the 0x80 bit in the action category, as required by
3006          * 802.11-2012 9.24.4.
3007          * Newer versions of hostapd shall also use the management frame
3008          * registration mechanisms, but older ones still use cooked
3009          * monitor interfaces so push all frames there.
3010          */
3011         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3012             (sdata->vif.type == NL80211_IFTYPE_AP ||
3013              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3014                 return RX_DROP_MONITOR;
3015
3016         if (is_multicast_ether_addr(mgmt->da))
3017                 return RX_DROP_MONITOR;
3018
3019         /* do not return rejected action frames */
3020         if (mgmt->u.action.category & 0x80)
3021                 return RX_DROP_UNUSABLE;
3022
3023         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3024                                GFP_ATOMIC);
3025         if (nskb) {
3026                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3027
3028                 nmgmt->u.action.category |= 0x80;
3029                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3030                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3031
3032                 memset(nskb->cb, 0, sizeof(nskb->cb));
3033
3034                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3035                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3036
3037                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3038                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3039                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3040                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3041                                 info->hw_queue =
3042                                         local->hw.offchannel_tx_hw_queue;
3043                 }
3044
3045                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3046                                             status->band);
3047         }
3048         dev_kfree_skb(rx->skb);
3049         return RX_QUEUED;
3050 }
3051
3052 static ieee80211_rx_result debug_noinline
3053 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3054 {
3055         struct ieee80211_sub_if_data *sdata = rx->sdata;
3056         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3057         __le16 stype;
3058
3059         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3060
3061         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3062             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3063             sdata->vif.type != NL80211_IFTYPE_OCB &&
3064             sdata->vif.type != NL80211_IFTYPE_STATION)
3065                 return RX_DROP_MONITOR;
3066
3067         switch (stype) {
3068         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3069         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3070         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3071                 /* process for all: mesh, mlme, ibss */
3072                 break;
3073         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3074         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3075         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3076         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3077                 if (is_multicast_ether_addr(mgmt->da) &&
3078                     !is_broadcast_ether_addr(mgmt->da))
3079                         return RX_DROP_MONITOR;
3080
3081                 /* process only for station */
3082                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3083                         return RX_DROP_MONITOR;
3084                 break;
3085         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3086                 /* process only for ibss and mesh */
3087                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3088                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3089                         return RX_DROP_MONITOR;
3090                 break;
3091         default:
3092                 return RX_DROP_MONITOR;
3093         }
3094
3095         /* queue up frame and kick off work to process it */
3096         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3097         skb_queue_tail(&sdata->skb_queue, rx->skb);
3098         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3099         if (rx->sta)
3100                 rx->sta->rx_stats.packets++;
3101
3102         return RX_QUEUED;
3103 }
3104
3105 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3106                                         struct ieee80211_rate *rate)
3107 {
3108         struct ieee80211_sub_if_data *sdata;
3109         struct ieee80211_local *local = rx->local;
3110         struct sk_buff *skb = rx->skb, *skb2;
3111         struct net_device *prev_dev = NULL;
3112         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3113         int needed_headroom;
3114
3115         /*
3116          * If cooked monitor has been processed already, then
3117          * don't do it again. If not, set the flag.
3118          */
3119         if (rx->flags & IEEE80211_RX_CMNTR)
3120                 goto out_free_skb;
3121         rx->flags |= IEEE80211_RX_CMNTR;
3122
3123         /* If there are no cooked monitor interfaces, just free the SKB */
3124         if (!local->cooked_mntrs)
3125                 goto out_free_skb;
3126
3127         /* vendor data is long removed here */
3128         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3129         /* room for the radiotap header based on driver features */
3130         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3131
3132         if (skb_headroom(skb) < needed_headroom &&
3133             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3134                 goto out_free_skb;
3135
3136         /* prepend radiotap information */
3137         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3138                                          false);
3139
3140         skb_reset_mac_header(skb);
3141         skb->ip_summed = CHECKSUM_UNNECESSARY;
3142         skb->pkt_type = PACKET_OTHERHOST;
3143         skb->protocol = htons(ETH_P_802_2);
3144
3145         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3146                 if (!ieee80211_sdata_running(sdata))
3147                         continue;
3148
3149                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3150                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3151                         continue;
3152
3153                 if (prev_dev) {
3154                         skb2 = skb_clone(skb, GFP_ATOMIC);
3155                         if (skb2) {
3156                                 skb2->dev = prev_dev;
3157                                 netif_receive_skb(skb2);
3158                         }
3159                 }
3160
3161                 prev_dev = sdata->dev;
3162                 ieee80211_rx_stats(sdata->dev, skb->len);
3163         }
3164
3165         if (prev_dev) {
3166                 skb->dev = prev_dev;
3167                 netif_receive_skb(skb);
3168                 return;
3169         }
3170
3171  out_free_skb:
3172         dev_kfree_skb(skb);
3173 }
3174
3175 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3176                                          ieee80211_rx_result res)
3177 {
3178         switch (res) {
3179         case RX_DROP_MONITOR:
3180                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3181                 if (rx->sta)
3182                         rx->sta->rx_stats.dropped++;
3183                 /* fall through */
3184         case RX_CONTINUE: {
3185                 struct ieee80211_rate *rate = NULL;
3186                 struct ieee80211_supported_band *sband;
3187                 struct ieee80211_rx_status *status;
3188
3189                 status = IEEE80211_SKB_RXCB((rx->skb));
3190
3191                 sband = rx->local->hw.wiphy->bands[status->band];
3192                 if (!(status->flag & RX_FLAG_HT) &&
3193                     !(status->flag & RX_FLAG_VHT))
3194                         rate = &sband->bitrates[status->rate_idx];
3195
3196                 ieee80211_rx_cooked_monitor(rx, rate);
3197                 break;
3198                 }
3199         case RX_DROP_UNUSABLE:
3200                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3201                 if (rx->sta)
3202                         rx->sta->rx_stats.dropped++;
3203                 dev_kfree_skb(rx->skb);
3204                 break;
3205         case RX_QUEUED:
3206                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3207                 break;
3208         }
3209 }
3210
3211 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3212                                   struct sk_buff_head *frames)
3213 {
3214         ieee80211_rx_result res = RX_DROP_MONITOR;
3215         struct sk_buff *skb;
3216
3217 #define CALL_RXH(rxh)                   \
3218         do {                            \
3219                 res = rxh(rx);          \
3220                 if (res != RX_CONTINUE) \
3221                         goto rxh_next;  \
3222         } while (0)
3223
3224         /* Lock here to avoid hitting all of the data used in the RX
3225          * path (e.g. key data, station data, ...) concurrently when
3226          * a frame is released from the reorder buffer due to timeout
3227          * from the timer, potentially concurrently with RX from the
3228          * driver.
3229          */
3230         spin_lock_bh(&rx->local->rx_path_lock);
3231
3232         while ((skb = __skb_dequeue(frames))) {
3233                 /*
3234                  * all the other fields are valid across frames
3235                  * that belong to an aMPDU since they are on the
3236                  * same TID from the same station
3237                  */
3238                 rx->skb = skb;
3239
3240                 CALL_RXH(ieee80211_rx_h_check_more_data);
3241                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3242                 CALL_RXH(ieee80211_rx_h_sta_process);
3243                 CALL_RXH(ieee80211_rx_h_decrypt);
3244                 CALL_RXH(ieee80211_rx_h_defragment);
3245                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3246                 /* must be after MMIC verify so header is counted in MPDU mic */
3247 #ifdef CONFIG_MAC80211_MESH
3248                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3249                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3250 #endif
3251                 CALL_RXH(ieee80211_rx_h_amsdu);
3252                 CALL_RXH(ieee80211_rx_h_data);
3253
3254                 /* special treatment -- needs the queue */
3255                 res = ieee80211_rx_h_ctrl(rx, frames);
3256                 if (res != RX_CONTINUE)
3257                         goto rxh_next;
3258
3259                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3260                 CALL_RXH(ieee80211_rx_h_action);
3261                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3262                 CALL_RXH(ieee80211_rx_h_action_return);
3263                 CALL_RXH(ieee80211_rx_h_mgmt);
3264
3265  rxh_next:
3266                 ieee80211_rx_handlers_result(rx, res);
3267
3268 #undef CALL_RXH
3269         }
3270
3271         spin_unlock_bh(&rx->local->rx_path_lock);
3272 }
3273
3274 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3275 {
3276         struct sk_buff_head reorder_release;
3277         ieee80211_rx_result res = RX_DROP_MONITOR;
3278
3279         __skb_queue_head_init(&reorder_release);
3280
3281 #define CALL_RXH(rxh)                   \
3282         do {                            \
3283                 res = rxh(rx);          \
3284                 if (res != RX_CONTINUE) \
3285                         goto rxh_next;  \
3286         } while (0)
3287
3288         CALL_RXH(ieee80211_rx_h_check_dup);
3289         CALL_RXH(ieee80211_rx_h_check);
3290
3291         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3292
3293         ieee80211_rx_handlers(rx, &reorder_release);
3294         return;
3295
3296  rxh_next:
3297         ieee80211_rx_handlers_result(rx, res);
3298
3299 #undef CALL_RXH
3300 }
3301
3302 /*
3303  * This function makes calls into the RX path, therefore
3304  * it has to be invoked under RCU read lock.
3305  */
3306 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3307 {
3308         struct sk_buff_head frames;
3309         struct ieee80211_rx_data rx = {
3310                 .sta = sta,
3311                 .sdata = sta->sdata,
3312                 .local = sta->local,
3313                 /* This is OK -- must be QoS data frame */
3314                 .security_idx = tid,
3315                 .seqno_idx = tid,
3316                 .napi = NULL, /* must be NULL to not have races */
3317         };
3318         struct tid_ampdu_rx *tid_agg_rx;
3319
3320         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3321         if (!tid_agg_rx)
3322                 return;
3323
3324         __skb_queue_head_init(&frames);
3325
3326         spin_lock(&tid_agg_rx->reorder_lock);
3327         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3328         spin_unlock(&tid_agg_rx->reorder_lock);
3329
3330         if (!skb_queue_empty(&frames)) {
3331                 struct ieee80211_event event = {
3332                         .type = BA_FRAME_TIMEOUT,
3333                         .u.ba.tid = tid,
3334                         .u.ba.sta = &sta->sta,
3335                 };
3336                 drv_event_callback(rx.local, rx.sdata, &event);
3337         }
3338
3339         ieee80211_rx_handlers(&rx, &frames);
3340 }
3341
3342 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3343                                           u16 ssn, u64 filtered,
3344                                           u16 received_mpdus)
3345 {
3346         struct sta_info *sta;
3347         struct tid_ampdu_rx *tid_agg_rx;
3348         struct sk_buff_head frames;
3349         struct ieee80211_rx_data rx = {
3350                 /* This is OK -- must be QoS data frame */
3351                 .security_idx = tid,
3352                 .seqno_idx = tid,
3353         };
3354         int i, diff;
3355
3356         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3357                 return;
3358
3359         __skb_queue_head_init(&frames);
3360
3361         sta = container_of(pubsta, struct sta_info, sta);
3362
3363         rx.sta = sta;
3364         rx.sdata = sta->sdata;
3365         rx.local = sta->local;
3366
3367         rcu_read_lock();
3368         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3369         if (!tid_agg_rx)
3370                 goto out;
3371
3372         spin_lock_bh(&tid_agg_rx->reorder_lock);
3373
3374         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3375                 int release;
3376
3377                 /* release all frames in the reorder buffer */
3378                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3379                            IEEE80211_SN_MODULO;
3380                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3381                                                  release, &frames);
3382                 /* update ssn to match received ssn */
3383                 tid_agg_rx->head_seq_num = ssn;
3384         } else {
3385                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3386                                                  &frames);
3387         }
3388
3389         /* handle the case that received ssn is behind the mac ssn.
3390          * it can be tid_agg_rx->buf_size behind and still be valid */
3391         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3392         if (diff >= tid_agg_rx->buf_size) {
3393                 tid_agg_rx->reorder_buf_filtered = 0;
3394                 goto release;
3395         }
3396         filtered = filtered >> diff;
3397         ssn += diff;
3398
3399         /* update bitmap */
3400         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3401                 int index = (ssn + i) % tid_agg_rx->buf_size;
3402
3403                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3404                 if (filtered & BIT_ULL(i))
3405                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3406         }
3407
3408         /* now process also frames that the filter marking released */
3409         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3410
3411 release:
3412         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3413
3414         ieee80211_rx_handlers(&rx, &frames);
3415
3416  out:
3417         rcu_read_unlock();
3418 }
3419 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3420
3421 /* main receive path */
3422
3423 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3424 {
3425         struct ieee80211_sub_if_data *sdata = rx->sdata;
3426         struct sk_buff *skb = rx->skb;
3427         struct ieee80211_hdr *hdr = (void *)skb->data;
3428         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3429         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3430         int multicast = is_multicast_ether_addr(hdr->addr1);
3431
3432         switch (sdata->vif.type) {
3433         case NL80211_IFTYPE_STATION:
3434                 if (!bssid && !sdata->u.mgd.use_4addr)
3435                         return false;
3436                 if (multicast)
3437                         return true;
3438                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3439         case NL80211_IFTYPE_ADHOC:
3440                 if (!bssid)
3441                         return false;
3442                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3443                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3444                         return false;
3445                 if (ieee80211_is_beacon(hdr->frame_control))
3446                         return true;
3447                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3448                         return false;
3449                 if (!multicast &&
3450                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3451                         return false;
3452                 if (!rx->sta) {
3453                         int rate_idx;
3454                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3455                                 rate_idx = 0; /* TODO: HT/VHT rates */
3456                         else
3457                                 rate_idx = status->rate_idx;
3458                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3459                                                  BIT(rate_idx));
3460                 }
3461                 return true;
3462         case NL80211_IFTYPE_OCB:
3463                 if (!bssid)
3464                         return false;
3465                 if (!ieee80211_is_data_present(hdr->frame_control))
3466                         return false;
3467                 if (!is_broadcast_ether_addr(bssid))
3468                         return false;
3469                 if (!multicast &&
3470                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3471                         return false;
3472                 if (!rx->sta) {
3473                         int rate_idx;
3474                         if (status->flag & RX_FLAG_HT)
3475                                 rate_idx = 0; /* TODO: HT rates */
3476                         else
3477                                 rate_idx = status->rate_idx;
3478                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3479                                                 BIT(rate_idx));
3480                 }
3481                 return true;
3482         case NL80211_IFTYPE_MESH_POINT:
3483                 if (multicast)
3484                         return true;
3485                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3486         case NL80211_IFTYPE_AP_VLAN:
3487         case NL80211_IFTYPE_AP:
3488                 if (!bssid)
3489                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3490
3491                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3492                         /*
3493                          * Accept public action frames even when the
3494                          * BSSID doesn't match, this is used for P2P
3495                          * and location updates. Note that mac80211
3496                          * itself never looks at these frames.
3497                          */
3498                         if (!multicast &&
3499                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3500                                 return false;
3501                         if (ieee80211_is_public_action(hdr, skb->len))
3502                                 return true;
3503                         return ieee80211_is_beacon(hdr->frame_control);
3504                 }
3505
3506                 if (!ieee80211_has_tods(hdr->frame_control)) {
3507                         /* ignore data frames to TDLS-peers */
3508                         if (ieee80211_is_data(hdr->frame_control))
3509                                 return false;
3510                         /* ignore action frames to TDLS-peers */
3511                         if (ieee80211_is_action(hdr->frame_control) &&
3512                             !is_broadcast_ether_addr(bssid) &&
3513                             !ether_addr_equal(bssid, hdr->addr1))
3514                                 return false;
3515                 }
3516                 return true;
3517         case NL80211_IFTYPE_WDS:
3518                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3519                         return false;
3520                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3521         case NL80211_IFTYPE_P2P_DEVICE:
3522                 return ieee80211_is_public_action(hdr, skb->len) ||
3523                        ieee80211_is_probe_req(hdr->frame_control) ||
3524                        ieee80211_is_probe_resp(hdr->frame_control) ||
3525                        ieee80211_is_beacon(hdr->frame_control);
3526         default:
3527                 break;
3528         }
3529
3530         WARN_ON_ONCE(1);
3531         return false;
3532 }
3533
3534 void ieee80211_check_fast_rx(struct sta_info *sta)
3535 {
3536         struct ieee80211_sub_if_data *sdata = sta->sdata;
3537         struct ieee80211_local *local = sdata->local;
3538         struct ieee80211_key *key;
3539         struct ieee80211_fast_rx fastrx = {
3540                 .dev = sdata->dev,
3541                 .vif_type = sdata->vif.type,
3542                 .control_port_protocol = sdata->control_port_protocol,
3543         }, *old, *new = NULL;
3544         bool assign = false;
3545
3546         /* use sparse to check that we don't return without updating */
3547         __acquire(check_fast_rx);
3548
3549         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3550         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3551         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3552         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3553
3554         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3555
3556         /* fast-rx doesn't do reordering */
3557         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3558             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3559                 goto clear;
3560
3561         switch (sdata->vif.type) {
3562         case NL80211_IFTYPE_STATION:
3563                 /* 4-addr is harder to deal with, later maybe */
3564                 if (sdata->u.mgd.use_4addr)
3565                         goto clear;
3566                 /* software powersave is a huge mess, avoid all of it */
3567                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3568                         goto clear;
3569                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3570                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3571                         goto clear;
3572                 if (sta->sta.tdls) {
3573                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3574                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3575                         fastrx.expected_ds_bits = 0;
3576                 } else {
3577                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3578                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3579                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3580                         fastrx.expected_ds_bits =
3581                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3582                 }
3583                 break;
3584         case NL80211_IFTYPE_AP_VLAN:
3585         case NL80211_IFTYPE_AP:
3586                 /* parallel-rx requires this, at least with calls to
3587                  * ieee80211_sta_ps_transition()
3588                  */
3589                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3590                         goto clear;
3591                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3592                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3593                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3594
3595                 fastrx.internal_forward =
3596                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3597                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3598                          !sdata->u.vlan.sta);
3599                 break;
3600         default:
3601                 goto clear;
3602         }
3603
3604         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3605                 goto clear;
3606
3607         rcu_read_lock();
3608         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3609         if (key) {
3610                 switch (key->conf.cipher) {
3611                 case WLAN_CIPHER_SUITE_TKIP:
3612                         /* we don't want to deal with MMIC in fast-rx */
3613                         goto clear_rcu;
3614                 case WLAN_CIPHER_SUITE_CCMP:
3615                 case WLAN_CIPHER_SUITE_CCMP_256:
3616                 case WLAN_CIPHER_SUITE_GCMP:
3617                 case WLAN_CIPHER_SUITE_GCMP_256:
3618                         break;
3619                 default:
3620                         /* we also don't want to deal with WEP or cipher scheme
3621                          * since those require looking up the key idx in the
3622                          * frame, rather than assuming the PTK is used
3623                          * (we need to revisit this once we implement the real
3624                          * PTK index, which is now valid in the spec, but we
3625                          * haven't implemented that part yet)
3626                          */
3627                         goto clear_rcu;
3628                 }
3629
3630                 fastrx.key = true;
3631                 fastrx.icv_len = key->conf.icv_len;
3632         }
3633
3634         assign = true;
3635  clear_rcu:
3636         rcu_read_unlock();
3637  clear:
3638         __release(check_fast_rx);
3639
3640         if (assign)
3641                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3642
3643         spin_lock_bh(&sta->lock);
3644         old = rcu_dereference_protected(sta->fast_rx, true);
3645         rcu_assign_pointer(sta->fast_rx, new);
3646         spin_unlock_bh(&sta->lock);
3647
3648         if (old)
3649                 kfree_rcu(old, rcu_head);
3650 }
3651
3652 void ieee80211_clear_fast_rx(struct sta_info *sta)
3653 {
3654         struct ieee80211_fast_rx *old;
3655
3656         spin_lock_bh(&sta->lock);
3657         old = rcu_dereference_protected(sta->fast_rx, true);
3658         RCU_INIT_POINTER(sta->fast_rx, NULL);
3659         spin_unlock_bh(&sta->lock);
3660
3661         if (old)
3662                 kfree_rcu(old, rcu_head);
3663 }
3664
3665 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3666 {
3667         struct ieee80211_local *local = sdata->local;
3668         struct sta_info *sta;
3669
3670         lockdep_assert_held(&local->sta_mtx);
3671
3672         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3673                 if (sdata != sta->sdata &&
3674                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3675                         continue;
3676                 ieee80211_check_fast_rx(sta);
3677         }
3678 }
3679
3680 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3681 {
3682         struct ieee80211_local *local = sdata->local;
3683
3684         mutex_lock(&local->sta_mtx);
3685         __ieee80211_check_fast_rx_iface(sdata);
3686         mutex_unlock(&local->sta_mtx);
3687 }
3688
3689 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3690                                      struct ieee80211_fast_rx *fast_rx)
3691 {
3692         struct sk_buff *skb = rx->skb;
3693         struct ieee80211_hdr *hdr = (void *)skb->data;
3694         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3695         struct sta_info *sta = rx->sta;
3696         int orig_len = skb->len;
3697         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3698         struct {
3699                 u8 snap[sizeof(rfc1042_header)];
3700                 __be16 proto;
3701         } *payload __aligned(2);
3702         struct {
3703                 u8 da[ETH_ALEN];
3704                 u8 sa[ETH_ALEN];
3705         } addrs __aligned(2);
3706         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3707
3708         if (fast_rx->uses_rss)
3709                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3710
3711         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3712          * to a common data structure; drivers can implement that per queue
3713          * but we don't have that information in mac80211
3714          */
3715         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3716                 return false;
3717
3718 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3719
3720         /* If using encryption, we also need to have:
3721          *  - PN_VALIDATED: similar, but the implementation is tricky
3722          *  - DECRYPTED: necessary for PN_VALIDATED
3723          */
3724         if (fast_rx->key &&
3725             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3726                 return false;
3727
3728         /* we don't deal with A-MSDU deaggregation here */
3729         if (status->rx_flags & IEEE80211_RX_AMSDU)
3730                 return false;
3731
3732         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3733                 return false;
3734
3735         if (unlikely(ieee80211_is_frag(hdr)))
3736                 return false;
3737
3738         /* Since our interface address cannot be multicast, this
3739          * implicitly also rejects multicast frames without the
3740          * explicit check.
3741          *
3742          * We shouldn't get any *data* frames not addressed to us
3743          * (AP mode will accept multicast *management* frames), but
3744          * punting here will make it go through the full checks in
3745          * ieee80211_accept_frame().
3746          */
3747         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3748                 return false;
3749
3750         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3751                                               IEEE80211_FCTL_TODS)) !=
3752             fast_rx->expected_ds_bits)
3753                 goto drop;
3754
3755         /* assign the key to drop unencrypted frames (later)
3756          * and strip the IV/MIC if necessary
3757          */
3758         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3759                 /* GCMP header length is the same */
3760                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3761         }
3762
3763         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3764                 goto drop;
3765         payload = (void *)(skb->data + snap_offs);
3766
3767         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3768                 return false;
3769
3770         /* Don't handle these here since they require special code.
3771          * Accept AARP and IPX even though they should come with a
3772          * bridge-tunnel header - but if we get them this way then
3773          * there's little point in discarding them.
3774          */
3775         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3776                      payload->proto == fast_rx->control_port_protocol))
3777                 return false;
3778
3779         /* after this point, don't punt to the slowpath! */
3780
3781         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3782             pskb_trim(skb, skb->len - fast_rx->icv_len))
3783                 goto drop;
3784
3785         if (unlikely(fast_rx->sta_notify)) {
3786                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3787                 fast_rx->sta_notify = false;
3788         }
3789
3790         /* statistics part of ieee80211_rx_h_sta_process() */
3791         stats->last_rx = jiffies;
3792         stats->last_rate = sta_stats_encode_rate(status);
3793
3794         stats->fragments++;
3795
3796         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3797                 stats->last_signal = status->signal;
3798                 if (!fast_rx->uses_rss)
3799                         ewma_signal_add(&sta->rx_stats_avg.signal,
3800                                         -status->signal);
3801         }
3802
3803         if (status->chains) {
3804                 int i;
3805
3806                 stats->chains = status->chains;
3807                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3808                         int signal = status->chain_signal[i];
3809
3810                         if (!(status->chains & BIT(i)))
3811                                 continue;
3812
3813                         stats->chain_signal_last[i] = signal;
3814                         if (!fast_rx->uses_rss)
3815                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3816                                                 -signal);
3817                 }
3818         }
3819         /* end of statistics */
3820
3821         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3822                 goto drop;
3823
3824         /* do the header conversion - first grab the addresses */
3825         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3826         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3827         /* remove the SNAP but leave the ethertype */
3828         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3829         /* push the addresses in front */
3830         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3831
3832         skb->dev = fast_rx->dev;
3833
3834         ieee80211_rx_stats(fast_rx->dev, skb->len);
3835
3836         /* The seqno index has the same property as needed
3837          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3838          * for non-QoS-data frames. Here we know it's a data
3839          * frame, so count MSDUs.
3840          */
3841         u64_stats_update_begin(&stats->syncp);
3842         stats->msdu[rx->seqno_idx]++;
3843         stats->bytes += orig_len;
3844         u64_stats_update_end(&stats->syncp);
3845
3846         if (fast_rx->internal_forward) {
3847                 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3848
3849                 if (dsta) {
3850                         /*
3851                          * Send to wireless media and increase priority by 256
3852                          * to keep the received priority instead of
3853                          * reclassifying the frame (see cfg80211_classify8021d).
3854                          */
3855                         skb->priority += 256;
3856                         skb->protocol = htons(ETH_P_802_3);
3857                         skb_reset_network_header(skb);
3858                         skb_reset_mac_header(skb);
3859                         dev_queue_xmit(skb);
3860                         return true;
3861                 }
3862         }
3863
3864         /* deliver to local stack */
3865         skb->protocol = eth_type_trans(skb, fast_rx->dev);
3866         memset(skb->cb, 0, sizeof(skb->cb));
3867         if (rx->napi)
3868                 napi_gro_receive(rx->napi, skb);
3869         else
3870                 netif_receive_skb(skb);
3871
3872         return true;
3873  drop:
3874         dev_kfree_skb(skb);
3875         stats->dropped++;
3876         return true;
3877 }
3878
3879 /*
3880  * This function returns whether or not the SKB
3881  * was destined for RX processing or not, which,
3882  * if consume is true, is equivalent to whether
3883  * or not the skb was consumed.
3884  */
3885 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3886                                             struct sk_buff *skb, bool consume)
3887 {
3888         struct ieee80211_local *local = rx->local;
3889         struct ieee80211_sub_if_data *sdata = rx->sdata;
3890
3891         rx->skb = skb;
3892
3893         /* See if we can do fast-rx; if we have to copy we already lost,
3894          * so punt in that case. We should never have to deliver a data
3895          * frame to multiple interfaces anyway.
3896          *
3897          * We skip the ieee80211_accept_frame() call and do the necessary
3898          * checking inside ieee80211_invoke_fast_rx().
3899          */
3900         if (consume && rx->sta) {
3901                 struct ieee80211_fast_rx *fast_rx;
3902
3903                 fast_rx = rcu_dereference(rx->sta->fast_rx);
3904                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
3905                         return true;
3906         }
3907
3908         if (!ieee80211_accept_frame(rx))
3909                 return false;
3910
3911         if (!consume) {
3912                 skb = skb_copy(skb, GFP_ATOMIC);
3913                 if (!skb) {
3914                         if (net_ratelimit())
3915                                 wiphy_debug(local->hw.wiphy,
3916                                         "failed to copy skb for %s\n",
3917                                         sdata->name);
3918                         return true;
3919                 }
3920
3921                 rx->skb = skb;
3922         }
3923
3924         ieee80211_invoke_rx_handlers(rx);
3925         return true;
3926 }
3927
3928 /*
3929  * This is the actual Rx frames handler. as it belongs to Rx path it must
3930  * be called with rcu_read_lock protection.
3931  */
3932 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3933                                          struct ieee80211_sta *pubsta,
3934                                          struct sk_buff *skb,
3935                                          struct napi_struct *napi)
3936 {
3937         struct ieee80211_local *local = hw_to_local(hw);
3938         struct ieee80211_sub_if_data *sdata;
3939         struct ieee80211_hdr *hdr;
3940         __le16 fc;
3941         struct ieee80211_rx_data rx;
3942         struct ieee80211_sub_if_data *prev;
3943         struct rhash_head *tmp;
3944         int err = 0;
3945
3946         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3947         memset(&rx, 0, sizeof(rx));
3948         rx.skb = skb;
3949         rx.local = local;
3950         rx.napi = napi;
3951
3952         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3953                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3954
3955         if (ieee80211_is_mgmt(fc)) {
3956                 /* drop frame if too short for header */
3957                 if (skb->len < ieee80211_hdrlen(fc))
3958                         err = -ENOBUFS;
3959                 else
3960                         err = skb_linearize(skb);
3961         } else {
3962                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3963         }
3964
3965         if (err) {
3966                 dev_kfree_skb(skb);
3967                 return;
3968         }
3969
3970         hdr = (struct ieee80211_hdr *)skb->data;
3971         ieee80211_parse_qos(&rx);
3972         ieee80211_verify_alignment(&rx);
3973
3974         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3975                      ieee80211_is_beacon(hdr->frame_control)))
3976                 ieee80211_scan_rx(local, skb);
3977
3978         if (pubsta) {
3979                 rx.sta = container_of(pubsta, struct sta_info, sta);
3980                 rx.sdata = rx.sta->sdata;
3981                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3982                         return;
3983                 goto out;
3984         } else if (ieee80211_is_data(fc)) {
3985                 struct sta_info *sta, *prev_sta;
3986                 const struct bucket_table *tbl;
3987
3988                 prev_sta = NULL;
3989
3990                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3991
3992                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3993                         if (!prev_sta) {
3994                                 prev_sta = sta;
3995                                 continue;
3996                         }
3997
3998                         rx.sta = prev_sta;
3999                         rx.sdata = prev_sta->sdata;
4000                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4001
4002                         prev_sta = sta;
4003                 }
4004
4005                 if (prev_sta) {
4006                         rx.sta = prev_sta;
4007                         rx.sdata = prev_sta->sdata;
4008
4009                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4010                                 return;
4011                         goto out;
4012                 }
4013         }
4014
4015         prev = NULL;
4016
4017         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4018                 if (!ieee80211_sdata_running(sdata))
4019                         continue;
4020
4021                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4022                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4023                         continue;
4024
4025                 /*
4026                  * frame is destined for this interface, but if it's
4027                  * not also for the previous one we handle that after
4028                  * the loop to avoid copying the SKB once too much
4029                  */
4030
4031                 if (!prev) {
4032                         prev = sdata;
4033                         continue;
4034                 }
4035
4036                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4037                 rx.sdata = prev;
4038                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4039
4040                 prev = sdata;
4041         }
4042
4043         if (prev) {
4044                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4045                 rx.sdata = prev;
4046
4047                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4048                         return;
4049         }
4050
4051  out:
4052         dev_kfree_skb(skb);
4053 }
4054
4055 /*
4056  * This is the receive path handler. It is called by a low level driver when an
4057  * 802.11 MPDU is received from the hardware.
4058  */
4059 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4060                        struct sk_buff *skb, struct napi_struct *napi)
4061 {
4062         struct ieee80211_local *local = hw_to_local(hw);
4063         struct ieee80211_rate *rate = NULL;
4064         struct ieee80211_supported_band *sband;
4065         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4066
4067         WARN_ON_ONCE(softirq_count() == 0);
4068
4069         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4070                 goto drop;
4071
4072         sband = local->hw.wiphy->bands[status->band];
4073         if (WARN_ON(!sband))
4074                 goto drop;
4075
4076         /*
4077          * If we're suspending, it is possible although not too likely
4078          * that we'd be receiving frames after having already partially
4079          * quiesced the stack. We can't process such frames then since
4080          * that might, for example, cause stations to be added or other
4081          * driver callbacks be invoked.
4082          */
4083         if (unlikely(local->quiescing || local->suspended))
4084                 goto drop;
4085
4086         /* We might be during a HW reconfig, prevent Rx for the same reason */
4087         if (unlikely(local->in_reconfig))
4088                 goto drop;
4089
4090         /*
4091          * The same happens when we're not even started,
4092          * but that's worth a warning.
4093          */
4094         if (WARN_ON(!local->started))
4095                 goto drop;
4096
4097         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4098                 /*
4099                  * Validate the rate, unless a PLCP error means that
4100                  * we probably can't have a valid rate here anyway.
4101                  */
4102
4103                 if (status->flag & RX_FLAG_HT) {
4104                         /*
4105                          * rate_idx is MCS index, which can be [0-76]
4106                          * as documented on:
4107                          *
4108                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4109                          *
4110                          * Anything else would be some sort of driver or
4111                          * hardware error. The driver should catch hardware
4112                          * errors.
4113                          */
4114                         if (WARN(status->rate_idx > 76,
4115                                  "Rate marked as an HT rate but passed "
4116                                  "status->rate_idx is not "
4117                                  "an MCS index [0-76]: %d (0x%02x)\n",
4118                                  status->rate_idx,
4119                                  status->rate_idx))
4120                                 goto drop;
4121                 } else if (status->flag & RX_FLAG_VHT) {
4122                         if (WARN_ONCE(status->rate_idx > 9 ||
4123                                       !status->vht_nss ||
4124                                       status->vht_nss > 8,
4125                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4126                                       status->rate_idx, status->vht_nss))
4127                                 goto drop;
4128                 } else {
4129                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4130                                 goto drop;
4131                         rate = &sband->bitrates[status->rate_idx];
4132                 }
4133         }
4134
4135         status->rx_flags = 0;
4136
4137         /*
4138          * key references and virtual interfaces are protected using RCU
4139          * and this requires that we are in a read-side RCU section during
4140          * receive processing
4141          */
4142         rcu_read_lock();
4143
4144         /*
4145          * Frames with failed FCS/PLCP checksum are not returned,
4146          * all other frames are returned without radiotap header
4147          * if it was previously present.
4148          * Also, frames with less than 16 bytes are dropped.
4149          */
4150         skb = ieee80211_rx_monitor(local, skb, rate);
4151         if (!skb) {
4152                 rcu_read_unlock();
4153                 return;
4154         }
4155
4156         ieee80211_tpt_led_trig_rx(local,
4157                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4158                         skb->len);
4159
4160         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4161
4162         rcu_read_unlock();
4163
4164         return;
4165  drop:
4166         kfree_skb(skb);
4167 }
4168 EXPORT_SYMBOL(ieee80211_rx_napi);
4169
4170 /* This is a version of the rx handler that can be called from hard irq
4171  * context. Post the skb on the queue and schedule the tasklet */
4172 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4173 {
4174         struct ieee80211_local *local = hw_to_local(hw);
4175
4176         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4177
4178         skb->pkt_type = IEEE80211_RX_MSG;
4179         skb_queue_tail(&local->skb_queue, skb);
4180         tasklet_schedule(&local->tasklet);
4181 }
4182 EXPORT_SYMBOL(ieee80211_rx_irqsafe);