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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "led.h"
  27 #include "mesh.h"
  28 #include "wep.h"
  29 #include "wpa.h"
  30 #include "tkip.h"
  31 #include "wme.h"
  32 #include "rate.h"
  33
  34 /*
  35  * monitor mode reception
  36  *
  37  * This function cleans up the SKB, i.e. it removes all the stuff
  38  * only useful for monitoring.
  39  */
  40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                            struct sk_buff *skb)
  42 {
  43         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  44
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         __pskb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         return NULL;
  53                 }
  54         }
  55
  56         if (status->vendor_radiotap_len)
  57                 __pskb_pull(skb, status->vendor_radiotap_len);
  58
  59         return skb;
  60 }
  61
  62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + status->vendor_radiotap_len);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return 1;
  73         if (unlikely(skb->len < 16 + present_fcs_len +
  74                                 status->vendor_radiotap_len))
  75                 return 1;
  76         if (ieee80211_is_ctl(hdr->frame_control) &&
  77             !ieee80211_is_pspoll(hdr->frame_control) &&
  78             !ieee80211_is_back_req(hdr->frame_control))
  79                 return 1;
  80         return 0;
  81 }
  82
  83 static int
  84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  85                             struct ieee80211_rx_status *status)
  86 {
  87         int len;
  88
  89         /* always present fields */
  90         len = sizeof(struct ieee80211_radiotap_header) + 8;
  91
  92         /* allocate extra bitmaps */
  93         if (status->vendor_radiotap_len)
  94                 len += 4;
  95         if (status->chains)
  96                 len += 4 * hweight8(status->chains);
  97
  98         if (ieee80211_have_rx_timestamp(status)) {
  99                 len = ALIGN(len, 8);
 100                 len += 8;
 101         }
 102         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 103                 len += 1;
 104
 105         /* antenna field, if we don't have per-chain info */
 106         if (!status->chains)
 107                 len += 1;
 108
 109         /* padding for RX_FLAGS if necessary */
 110         len = ALIGN(len, 2);
 111
 112         if (status->flag & RX_FLAG_HT) /* HT info */
 113                 len += 3;
 114
 115         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 116                 len = ALIGN(len, 4);
 117                 len += 8;
 118         }
 119
 120         if (status->flag & RX_FLAG_VHT) {
 121                 len = ALIGN(len, 2);
 122                 len += 12;
 123         }
 124
 125         if (status->chains) {
 126                 /* antenna and antenna signal fields */
 127                 len += 2 * hweight8(status->chains);
 128         }
 129
 130         if (status->vendor_radiotap_len) {
 131                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
 132                         status->vendor_radiotap_align = 1;
 133                 /* align standard part of vendor namespace */
 134                 len = ALIGN(len, 2);
 135                 /* allocate standard part of vendor namespace */
 136                 len += 6;
 137                 /* align vendor-defined part */
 138                 len = ALIGN(len, status->vendor_radiotap_align);
 139                 /* vendor-defined part is already in skb */
 140         }
 141
 142         return len;
 143 }
 144
 145 /*
 146  * ieee80211_add_rx_radiotap_header - add radiotap header
 147  *
 148  * add a radiotap header containing all the fields which the hardware provided.
 149  */
 150 static void
 151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 152                                  struct sk_buff *skb,
 153                                  struct ieee80211_rate *rate,
 154                                  int rtap_len, bool has_fcs)
 155 {
 156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 157         struct ieee80211_radiotap_header *rthdr;
 158         unsigned char *pos;
 159         __le32 *it_present;
 160         u32 it_present_val;
 161         u16 rx_flags = 0;
 162         u16 channel_flags = 0;
 163         int mpdulen, chain;
 164         unsigned long chains = status->chains;
 165
 166         mpdulen = skb->len;
 167         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 168                 mpdulen += FCS_LEN;
 169
 170         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 171         memset(rthdr, 0, rtap_len);
 172         it_present = &rthdr->it_present;
 173
 174         /* radiotap header, set always present flags */
 175         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
 176         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 177                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 178                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 179
 180         if (!status->chains)
 181                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 182
 183         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 184                 it_present_val |=
 185                         BIT(IEEE80211_RADIOTAP_EXT) |
 186                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 187                 put_unaligned_le32(it_present_val, it_present);
 188                 it_present++;
 189                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 190                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 191         }
 192
 193         if (status->vendor_radiotap_len) {
 194                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 195                                   BIT(IEEE80211_RADIOTAP_EXT);
 196                 put_unaligned_le32(it_present_val, it_present);
 197                 it_present++;
 198                 it_present_val = status->vendor_radiotap_bitmap;
 199         }
 200
 201         put_unaligned_le32(it_present_val, it_present);
 202
 203         pos = (void *)(it_present + 1);
 204
 205         /* the order of the following fields is important */
 206
 207         /* IEEE80211_RADIOTAP_TSFT */
 208         if (ieee80211_have_rx_timestamp(status)) {
 209                 /* padding */
 210                 while ((pos - (u8 *)rthdr) & 7)
 211                         *pos++ = 0;
 212                 put_unaligned_le64(
 213                         ieee80211_calculate_rx_timestamp(local, status,
 214                                                          mpdulen, 0),
 215                         pos);
 216                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 217                 pos += 8;
 218         }
 219
 220         /* IEEE80211_RADIOTAP_FLAGS */
 221         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 222                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 223         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 224                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 225         if (status->flag & RX_FLAG_SHORTPRE)
 226                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 227         pos++;
 228
 229         /* IEEE80211_RADIOTAP_RATE */
 230         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 231                 /*
 232                  * Without rate information don't add it. If we have,
 233                  * MCS information is a separate field in radiotap,
 234                  * added below. The byte here is needed as padding
 235                  * for the channel though, so initialise it to 0.
 236                  */
 237                 *pos = 0;
 238         } else {
 239                 int shift = 0;
 240                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 241                 if (status->flag & RX_FLAG_10MHZ)
 242                         shift = 1;
 243                 else if (status->flag & RX_FLAG_5MHZ)
 244                         shift = 2;
 245                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 246         }
 247         pos++;
 248
 249         /* IEEE80211_RADIOTAP_CHANNEL */
 250         put_unaligned_le16(status->freq, pos);
 251         pos += 2;
 252         if (status->flag & RX_FLAG_10MHZ)
 253                 channel_flags |= IEEE80211_CHAN_HALF;
 254         else if (status->flag & RX_FLAG_5MHZ)
 255                 channel_flags |= IEEE80211_CHAN_QUARTER;
 256
 257         if (status->band == IEEE80211_BAND_5GHZ)
 258                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 259         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 260                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 261         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 262                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 263         else if (rate)
 264                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 265         else
 266                 channel_flags |= IEEE80211_CHAN_2GHZ;
 267         put_unaligned_le16(channel_flags, pos);
 268         pos += 2;
 269
 270         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 271         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 272             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 273                 *pos = status->signal;
 274                 rthdr->it_present |=
 275                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 276                 pos++;
 277         }
 278
 279         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 280
 281         if (!status->chains) {
 282                 /* IEEE80211_RADIOTAP_ANTENNA */
 283                 *pos = status->antenna;
 284                 pos++;
 285         }
 286
 287         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 288
 289         /* IEEE80211_RADIOTAP_RX_FLAGS */
 290         /* ensure 2 byte alignment for the 2 byte field as required */
 291         if ((pos - (u8 *)rthdr) & 1)
 292                 *pos++ = 0;
 293         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 294                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 295         put_unaligned_le16(rx_flags, pos);
 296         pos += 2;
 297
 298         if (status->flag & RX_FLAG_HT) {
 299                 unsigned int stbc;
 300
 301                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 302                 *pos++ = local->hw.radiotap_mcs_details;
 303                 *pos = 0;
 304                 if (status->flag & RX_FLAG_SHORT_GI)
 305                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 306                 if (status->flag & RX_FLAG_40MHZ)
 307                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 308                 if (status->flag & RX_FLAG_HT_GF)
 309                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 310                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 311                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 312                 pos++;
 313                 *pos++ = status->rate_idx;
 314         }
 315
 316         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 317                 u16 flags = 0;
 318
 319                 /* ensure 4 byte alignment */
 320                 while ((pos - (u8 *)rthdr) & 3)
 321                         pos++;
 322                 rthdr->it_present |=
 323                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 324                 put_unaligned_le32(status->ampdu_reference, pos);
 325                 pos += 4;
 326                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 327                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 328                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 329                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 330                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 331                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 332                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 333                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 334                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 335                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 336                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 337                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 338                 put_unaligned_le16(flags, pos);
 339                 pos += 2;
 340                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 341                         *pos++ = status->ampdu_delimiter_crc;
 342                 else
 343                         *pos++ = 0;
 344                 *pos++ = 0;
 345         }
 346
 347         if (status->flag & RX_FLAG_VHT) {
 348                 u16 known = local->hw.radiotap_vht_details;
 349
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 351                 /* known field - how to handle 80+80? */
 352                 if (status->flag & RX_FLAG_80P80MHZ)
 353                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 354                 put_unaligned_le16(known, pos);
 355                 pos += 2;
 356                 /* flags */
 357                 if (status->flag & RX_FLAG_SHORT_GI)
 358                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 359                 pos++;
 360                 /* bandwidth */
 361                 if (status->flag & RX_FLAG_80MHZ)
 362                         *pos++ = 4;
 363                 else if (status->flag & RX_FLAG_80P80MHZ)
 364                         *pos++ = 0; /* marked not known above */
 365                 else if (status->flag & RX_FLAG_160MHZ)
 366                         *pos++ = 11;
 367                 else if (status->flag & RX_FLAG_40MHZ)
 368                         *pos++ = 1;
 369                 else /* 20 MHz */
 370                         *pos++ = 0;
 371                 /* MCS/NSS */
 372                 *pos = (status->rate_idx << 4) | status->vht_nss;
 373                 pos += 4;
 374                 /* coding field */
 375                 pos++;
 376                 /* group ID */
 377                 pos++;
 378                 /* partial_aid */
 379                 pos += 2;
 380         }
 381
 382         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 383                 *pos++ = status->chain_signal[chain];
 384                 *pos++ = chain;
 385         }
 386
 387         if (status->vendor_radiotap_len) {
 388                 /* ensure 2 byte alignment for the vendor field as required */
 389                 if ((pos - (u8 *)rthdr) & 1)
 390                         *pos++ = 0;
 391                 *pos++ = status->vendor_radiotap_oui[0];
 392                 *pos++ = status->vendor_radiotap_oui[1];
 393                 *pos++ = status->vendor_radiotap_oui[2];
 394                 *pos++ = status->vendor_radiotap_subns;
 395                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 396                 pos += 2;
 397                 /* align the actual payload as requested */
 398                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 399                         *pos++ = 0;
 400         }
 401 }
 402
 403 /*
 404  * This function copies a received frame to all monitor interfaces and
 405  * returns a cleaned-up SKB that no longer includes the FCS nor the
 406  * radiotap header the driver might have added.
 407  */
 408 static struct sk_buff *
 409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 410                      struct ieee80211_rate *rate)
 411 {
 412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 413         struct ieee80211_sub_if_data *sdata;
 414         int needed_headroom;
 415         struct sk_buff *skb, *skb2;
 416         struct net_device *prev_dev = NULL;
 417         int present_fcs_len = 0;
 418
 419         /*
 420          * First, we may need to make a copy of the skb because
 421          *  (1) we need to modify it for radiotap (if not present), and
 422          *  (2) the other RX handlers will modify the skb we got.
 423          *
 424          * We don't need to, of course, if we aren't going to return
 425          * the SKB because it has a bad FCS/PLCP checksum.
 426          */
 427
 428         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 429                 present_fcs_len = FCS_LEN;
 430
 431         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 432         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 433                 dev_kfree_skb(origskb);
 434                 return NULL;
 435         }
 436
 437         if (!local->monitors) {
 438                 if (should_drop_frame(origskb, present_fcs_len)) {
 439                         dev_kfree_skb(origskb);
 440                         return NULL;
 441                 }
 442
 443                 return remove_monitor_info(local, origskb);
 444         }
 445
 446         /* room for the radiotap header based on driver features */
 447         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 448
 449         if (should_drop_frame(origskb, present_fcs_len)) {
 450                 /* only need to expand headroom if necessary */
 451                 skb = origskb;
 452                 origskb = NULL;
 453
 454                 /*
 455                  * This shouldn't trigger often because most devices have an
 456                  * RX header they pull before we get here, and that should
 457                  * be big enough for our radiotap information. We should
 458                  * probably export the length to drivers so that we can have
 459                  * them allocate enough headroom to start with.
 460                  */
 461                 if (skb_headroom(skb) < needed_headroom &&
 462                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 463                         dev_kfree_skb(skb);
 464                         return NULL;
 465                 }
 466         } else {
 467                 /*
 468                  * Need to make a copy and possibly remove radiotap header
 469                  * and FCS from the original.
 470                  */
 471                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 472
 473                 origskb = remove_monitor_info(local, origskb);
 474
 475                 if (!skb)
 476                         return origskb;
 477         }
 478
 479         /* prepend radiotap information */
 480         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 481                                          true);
 482
 483         skb_reset_mac_header(skb);
 484         skb->ip_summed = CHECKSUM_UNNECESSARY;
 485         skb->pkt_type = PACKET_OTHERHOST;
 486         skb->protocol = htons(ETH_P_802_2);
 487
 488         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 489                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 490                         continue;
 491
 492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 493                         continue;
 494
 495                 if (!ieee80211_sdata_running(sdata))
 496                         continue;
 497
 498                 if (prev_dev) {
 499                         skb2 = skb_clone(skb, GFP_ATOMIC);
 500                         if (skb2) {
 501                                 skb2->dev = prev_dev;
 502                                 netif_receive_skb(skb2);
 503                         }
 504                 }
 505
 506                 prev_dev = sdata->dev;
 507                 sdata->dev->stats.rx_packets++;
 508                 sdata->dev->stats.rx_bytes += skb->len;
 509         }
 510
 511         if (prev_dev) {
 512                 skb->dev = prev_dev;
 513                 netif_receive_skb(skb);
 514         } else
 515                 dev_kfree_skb(skb);
 516
 517         return origskb;
 518 }
 519
 520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 521 {
 522         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 524         int tid, seqno_idx, security_idx;
 525
 526         /* does the frame have a qos control field? */
 527         if (ieee80211_is_data_qos(hdr->frame_control)) {
 528                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 529                 /* frame has qos control */
 530                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 531                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 532                         status->rx_flags |= IEEE80211_RX_AMSDU;
 533
 534                 seqno_idx = tid;
 535                 security_idx = tid;
 536         } else {
 537                 /*
 538                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 539                  *
 540                  *      Sequence numbers for management frames, QoS data
 541                  *      frames with a broadcast/multicast address in the
 542                  *      Address 1 field, and all non-QoS data frames sent
 543                  *      by QoS STAs are assigned using an additional single
 544                  *      modulo-4096 counter, [...]
 545                  *
 546                  * We also use that counter for non-QoS STAs.
 547                  */
 548                 seqno_idx = IEEE80211_NUM_TIDS;
 549                 security_idx = 0;
 550                 if (ieee80211_is_mgmt(hdr->frame_control))
 551                         security_idx = IEEE80211_NUM_TIDS;
 552                 tid = 0;
 553         }
 554
 555         rx->seqno_idx = seqno_idx;
 556         rx->security_idx = security_idx;
 557         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 558          * For now, set skb->priority to 0 for other cases. */
 559         rx->skb->priority = (tid > 7) ? 0 : tid;
 560 }
 561
 562 /**
 563  * DOC: Packet alignment
 564  *
 565  * Drivers always need to pass packets that are aligned to two-byte boundaries
 566  * to the stack.
 567  *
 568  * Additionally, should, if possible, align the payload data in a way that
 569  * guarantees that the contained IP header is aligned to a four-byte
 570  * boundary. In the case of regular frames, this simply means aligning the
 571  * payload to a four-byte boundary (because either the IP header is directly
 572  * contained, or IV/RFC1042 headers that have a length divisible by four are
 573  * in front of it).  If the payload data is not properly aligned and the
 574  * architecture doesn't support efficient unaligned operations, mac80211
 575  * will align the data.
 576  *
 577  * With A-MSDU frames, however, the payload data address must yield two modulo
 578  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 579  * push the IP header further back to a multiple of four again. Thankfully, the
 580  * specs were sane enough this time around to require padding each A-MSDU
 581  * subframe to a length that is a multiple of four.
 582  *
 583  * Padding like Atheros hardware adds which is between the 802.11 header and
 584  * the payload is not supported, the driver is required to move the 802.11
 585  * header to be directly in front of the payload in that case.
 586  */
 587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 588 {
 589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 590         WARN_ONCE((unsigned long)rx->skb->data & 1,
 591                   "unaligned packet at 0x%p\n", rx->skb->data);
 592 #endif
 593 }
 594
 595
 596 /* rx handlers */
 597
 598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 599 {
 600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 601
 602         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 603                 return 0;
 604
 605         return ieee80211_is_robust_mgmt_frame(hdr);
 606 }
 607
 608
 609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 610 {
 611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 612
 613         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 614                 return 0;
 615
 616         return ieee80211_is_robust_mgmt_frame(hdr);
 617 }
 618
 619
 620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 622 {
 623         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 624         struct ieee80211_mmie *mmie;
 625
 626         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 627                 return -1;
 628
 629         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 630                 return -1; /* not a robust management frame */
 631
 632         mmie = (struct ieee80211_mmie *)
 633                 (skb->data + skb->len - sizeof(*mmie));
 634         if (mmie->element_id != WLAN_EID_MMIE ||
 635             mmie->length != sizeof(*mmie) - 2)
 636                 return -1;
 637
 638         return le16_to_cpu(mmie->key_id);
 639 }
 640
 641 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 642                                  struct sk_buff *skb)
 643 {
 644         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 645         __le16 fc;
 646         int hdrlen;
 647         u8 keyid;
 648
 649         fc = hdr->frame_control;
 650         hdrlen = ieee80211_hdrlen(fc);
 651
 652         if (skb->len < hdrlen + cs->hdr_len)
 653                 return -EINVAL;
 654
 655         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 656         keyid &= cs->key_idx_mask;
 657         keyid >>= cs->key_idx_shift;
 658
 659         return keyid;
 660 }
 661
 662 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 663 {
 664         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 665         char *dev_addr = rx->sdata->vif.addr;
 666
 667         if (ieee80211_is_data(hdr->frame_control)) {
 668                 if (is_multicast_ether_addr(hdr->addr1)) {
 669                         if (ieee80211_has_tods(hdr->frame_control) ||
 670                             !ieee80211_has_fromds(hdr->frame_control))
 671                                 return RX_DROP_MONITOR;
 672                         if (ether_addr_equal(hdr->addr3, dev_addr))
 673                                 return RX_DROP_MONITOR;
 674                 } else {
 675                         if (!ieee80211_has_a4(hdr->frame_control))
 676                                 return RX_DROP_MONITOR;
 677                         if (ether_addr_equal(hdr->addr4, dev_addr))
 678                                 return RX_DROP_MONITOR;
 679                 }
 680         }
 681
 682         /* If there is not an established peer link and this is not a peer link
 683          * establisment frame, beacon or probe, drop the frame.
 684          */
 685
 686         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 687                 struct ieee80211_mgmt *mgmt;
 688
 689                 if (!ieee80211_is_mgmt(hdr->frame_control))
 690                         return RX_DROP_MONITOR;
 691
 692                 if (ieee80211_is_action(hdr->frame_control)) {
 693                         u8 category;
 694
 695                         /* make sure category field is present */
 696                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 697                                 return RX_DROP_MONITOR;
 698
 699                         mgmt = (struct ieee80211_mgmt *)hdr;
 700                         category = mgmt->u.action.category;
 701                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 702                             category != WLAN_CATEGORY_SELF_PROTECTED)
 703                                 return RX_DROP_MONITOR;
 704                         return RX_CONTINUE;
 705                 }
 706
 707                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 708                     ieee80211_is_probe_resp(hdr->frame_control) ||
 709                     ieee80211_is_beacon(hdr->frame_control) ||
 710                     ieee80211_is_auth(hdr->frame_control))
 711                         return RX_CONTINUE;
 712
 713                 return RX_DROP_MONITOR;
 714         }
 715
 716         return RX_CONTINUE;
 717 }
 718
 719 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 720                                             struct tid_ampdu_rx *tid_agg_rx,
 721                                             int index,
 722                                             struct sk_buff_head *frames)
 723 {
 724         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 725         struct ieee80211_rx_status *status;
 726
 727         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 728
 729         if (!skb)
 730                 goto no_frame;
 731
 732         /* release the frame from the reorder ring buffer */
 733         tid_agg_rx->stored_mpdu_num--;
 734         tid_agg_rx->reorder_buf[index] = NULL;
 735         status = IEEE80211_SKB_RXCB(skb);
 736         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 737         __skb_queue_tail(frames, skb);
 738
 739 no_frame:
 740         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 741 }
 742
 743 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 744                                              struct tid_ampdu_rx *tid_agg_rx,
 745                                              u16 head_seq_num,
 746                                              struct sk_buff_head *frames)
 747 {
 748         int index;
 749
 750         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 751
 752         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 753                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 754                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 755                                                 frames);
 756         }
 757 }
 758
 759 /*
 760  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 761  * the skb was added to the buffer longer than this time ago, the earlier
 762  * frames that have not yet been received are assumed to be lost and the skb
 763  * can be released for processing. This may also release other skb's from the
 764  * reorder buffer if there are no additional gaps between the frames.
 765  *
 766  * Callers must hold tid_agg_rx->reorder_lock.
 767  */
 768 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 769
 770 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 771                                           struct tid_ampdu_rx *tid_agg_rx,
 772                                           struct sk_buff_head *frames)
 773 {
 774         int index, j;
 775
 776         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 777
 778         /* release the buffer until next missing frame */
 779         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 780         if (!tid_agg_rx->reorder_buf[index] &&
 781             tid_agg_rx->stored_mpdu_num) {
 782                 /*
 783                  * No buffers ready to be released, but check whether any
 784                  * frames in the reorder buffer have timed out.
 785                  */
 786                 int skipped = 1;
 787                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 788                      j = (j + 1) % tid_agg_rx->buf_size) {
 789                         if (!tid_agg_rx->reorder_buf[j]) {
 790                                 skipped++;
 791                                 continue;
 792                         }
 793                         if (skipped &&
 794                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 795                                         HT_RX_REORDER_BUF_TIMEOUT))
 796                                 goto set_release_timer;
 797
 798                         ht_dbg_ratelimited(sdata,
 799                                            "release an RX reorder frame due to timeout on earlier frames\n");
 800                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 801                                                         frames);
 802
 803                         /*
 804                          * Increment the head seq# also for the skipped slots.
 805                          */
 806                         tid_agg_rx->head_seq_num =
 807                                 (tid_agg_rx->head_seq_num +
 808                                  skipped) & IEEE80211_SN_MASK;
 809                         skipped = 0;
 810                 }
 811         } else while (tid_agg_rx->reorder_buf[index]) {
 812                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 813                                                 frames);
 814                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 815         }
 816
 817         if (tid_agg_rx->stored_mpdu_num) {
 818                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 819
 820                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 821                      j = (j + 1) % tid_agg_rx->buf_size) {
 822                         if (tid_agg_rx->reorder_buf[j])
 823                                 break;
 824                 }
 825
 826  set_release_timer:
 827
 828                 mod_timer(&tid_agg_rx->reorder_timer,
 829                           tid_agg_rx->reorder_time[j] + 1 +
 830                           HT_RX_REORDER_BUF_TIMEOUT);
 831         } else {
 832                 del_timer(&tid_agg_rx->reorder_timer);
 833         }
 834 }
 835
 836 /*
 837  * As this function belongs to the RX path it must be under
 838  * rcu_read_lock protection. It returns false if the frame
 839  * can be processed immediately, true if it was consumed.
 840  */
 841 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 842                                              struct tid_ampdu_rx *tid_agg_rx,
 843                                              struct sk_buff *skb,
 844                                              struct sk_buff_head *frames)
 845 {
 846         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 847         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 848         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 849         u16 head_seq_num, buf_size;
 850         int index;
 851         bool ret = true;
 852
 853         spin_lock(&tid_agg_rx->reorder_lock);
 854
 855         buf_size = tid_agg_rx->buf_size;
 856         head_seq_num = tid_agg_rx->head_seq_num;
 857
 858         /* frame with out of date sequence number */
 859         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 860                 dev_kfree_skb(skb);
 861                 goto out;
 862         }
 863
 864         /*
 865          * If frame the sequence number exceeds our buffering window
 866          * size release some previous frames to make room for this one.
 867          */
 868         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 869                 head_seq_num = ieee80211_sn_inc(
 870                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 871                 /* release stored frames up to new head to stack */
 872                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 873                                                  head_seq_num, frames);
 874         }
 875
 876         /* Now the new frame is always in the range of the reordering buffer */
 877
 878         index = mpdu_seq_num % tid_agg_rx->buf_size;
 879
 880         /* check if we already stored this frame */
 881         if (tid_agg_rx->reorder_buf[index]) {
 882                 dev_kfree_skb(skb);
 883                 goto out;
 884         }
 885
 886         /*
 887          * If the current MPDU is in the right order and nothing else
 888          * is stored we can process it directly, no need to buffer it.
 889          * If it is first but there's something stored, we may be able
 890          * to release frames after this one.
 891          */
 892         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 893             tid_agg_rx->stored_mpdu_num == 0) {
 894                 tid_agg_rx->head_seq_num =
 895                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 896                 ret = false;
 897                 goto out;
 898         }
 899
 900         /* put the frame in the reordering buffer */
 901         tid_agg_rx->reorder_buf[index] = skb;
 902         tid_agg_rx->reorder_time[index] = jiffies;
 903         tid_agg_rx->stored_mpdu_num++;
 904         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 905
 906  out:
 907         spin_unlock(&tid_agg_rx->reorder_lock);
 908         return ret;
 909 }
 910
 911 /*
 912  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 913  * true if the MPDU was buffered, false if it should be processed.
 914  */
 915 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 916                                        struct sk_buff_head *frames)
 917 {
 918         struct sk_buff *skb = rx->skb;
 919         struct ieee80211_local *local = rx->local;
 920         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 921         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 922         struct sta_info *sta = rx->sta;
 923         struct tid_ampdu_rx *tid_agg_rx;
 924         u16 sc;
 925         u8 tid, ack_policy;
 926
 927         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 928             is_multicast_ether_addr(hdr->addr1))
 929                 goto dont_reorder;
 930
 931         /*
 932          * filter the QoS data rx stream according to
 933          * STA/TID and check if this STA/TID is on aggregation
 934          */
 935
 936         if (!sta)
 937                 goto dont_reorder;
 938
 939         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 940                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 941         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 942
 943         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 944         if (!tid_agg_rx)
 945                 goto dont_reorder;
 946
 947         /* qos null data frames are excluded */
 948         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 949                 goto dont_reorder;
 950
 951         /* not part of a BA session */
 952         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 953             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 954                 goto dont_reorder;
 955
 956         /* not actually part of this BA session */
 957         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 958                 goto dont_reorder;
 959
 960         /* new, potentially un-ordered, ampdu frame - process it */
 961
 962         /* reset session timer */
 963         if (tid_agg_rx->timeout)
 964                 tid_agg_rx->last_rx = jiffies;
 965
 966         /* if this mpdu is fragmented - terminate rx aggregation session */
 967         sc = le16_to_cpu(hdr->seq_ctrl);
 968         if (sc & IEEE80211_SCTL_FRAG) {
 969                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 970                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 971                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 972                 return;
 973         }
 974
 975         /*
 976          * No locking needed -- we will only ever process one
 977          * RX packet at a time, and thus own tid_agg_rx. All
 978          * other code manipulating it needs to (and does) make
 979          * sure that we cannot get to it any more before doing
 980          * anything with it.
 981          */
 982         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 983                                              frames))
 984                 return;
 985
 986  dont_reorder:
 987         __skb_queue_tail(frames, skb);
 988 }
 989
 990 static ieee80211_rx_result debug_noinline
 991 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 992 {
 993         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 994         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 995
 996         /*
 997          * Drop duplicate 802.11 retransmissions
 998          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 999          */
1000         if (rx->skb->len >= 24 && rx->sta &&
1001             !ieee80211_is_ctl(hdr->frame_control) &&
1002             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1003             !is_multicast_ether_addr(hdr->addr1)) {
1004                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1005                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1006                              hdr->seq_ctrl)) {
1007                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1008                                 rx->local->dot11FrameDuplicateCount++;
1009                                 rx->sta->num_duplicates++;
1010                         }
1011                         return RX_DROP_UNUSABLE;
1012                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1014                 }
1015         }
1016
1017         if (unlikely(rx->skb->len < 16)) {
1018                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1019                 return RX_DROP_MONITOR;
1020         }
1021
1022         /* Drop disallowed frame classes based on STA auth/assoc state;
1023          * IEEE 802.11, Chap 5.5.
1024          *
1025          * mac80211 filters only based on association state, i.e. it drops
1026          * Class 3 frames from not associated stations. hostapd sends
1027          * deauth/disassoc frames when needed. In addition, hostapd is
1028          * responsible for filtering on both auth and assoc states.
1029          */
1030
1031         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1032                 return ieee80211_rx_mesh_check(rx);
1033
1034         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1035                       ieee80211_is_pspoll(hdr->frame_control)) &&
1036                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1037                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1038                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1039                 /*
1040                  * accept port control frames from the AP even when it's not
1041                  * yet marked ASSOC to prevent a race where we don't set the
1042                  * assoc bit quickly enough before it sends the first frame
1043                  */
1044                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1045                     ieee80211_is_data_present(hdr->frame_control)) {
1046                         unsigned int hdrlen;
1047                         __be16 ethertype;
1048
1049                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1050
1051                         if (rx->skb->len < hdrlen + 8)
1052                                 return RX_DROP_MONITOR;
1053
1054                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1055                         if (ethertype == rx->sdata->control_port_protocol)
1056                                 return RX_CONTINUE;
1057                 }
1058
1059                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1060                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1061                                                hdr->addr2,
1062                                                GFP_ATOMIC))
1063                         return RX_DROP_UNUSABLE;
1064
1065                 return RX_DROP_MONITOR;
1066         }
1067
1068         return RX_CONTINUE;
1069 }
1070
1071
1072 static ieee80211_rx_result debug_noinline
1073 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074 {
1075         struct ieee80211_local *local;
1076         struct ieee80211_hdr *hdr;
1077         struct sk_buff *skb;
1078
1079         local = rx->local;
1080         skb = rx->skb;
1081         hdr = (struct ieee80211_hdr *) skb->data;
1082
1083         if (!local->pspolling)
1084                 return RX_CONTINUE;
1085
1086         if (!ieee80211_has_fromds(hdr->frame_control))
1087                 /* this is not from AP */
1088                 return RX_CONTINUE;
1089
1090         if (!ieee80211_is_data(hdr->frame_control))
1091                 return RX_CONTINUE;
1092
1093         if (!ieee80211_has_moredata(hdr->frame_control)) {
1094                 /* AP has no more frames buffered for us */
1095                 local->pspolling = false;
1096                 return RX_CONTINUE;
1097         }
1098
1099         /* more data bit is set, let's request a new frame from the AP */
1100         ieee80211_send_pspoll(local, rx->sdata);
1101
1102         return RX_CONTINUE;
1103 }
1104
1105 static void sta_ps_start(struct sta_info *sta)
1106 {
1107         struct ieee80211_sub_if_data *sdata = sta->sdata;
1108         struct ieee80211_local *local = sdata->local;
1109         struct ps_data *ps;
1110
1111         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1112             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1113                 ps = &sdata->bss->ps;
1114         else
1115                 return;
1116
1117         atomic_inc(&ps->num_sta_ps);
1118         set_sta_flag(sta, WLAN_STA_PS_STA);
1119         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1120                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1121         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1122                sta->sta.addr, sta->sta.aid);
1123 }
1124
1125 static void sta_ps_end(struct sta_info *sta)
1126 {
1127         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1128                sta->sta.addr, sta->sta.aid);
1129
1130         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1131                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1132                        sta->sta.addr, sta->sta.aid);
1133                 return;
1134         }
1135
1136         ieee80211_sta_ps_deliver_wakeup(sta);
1137 }
1138
1139 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1140 {
1141         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1142         bool in_ps;
1143
1144         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1145
1146         /* Don't let the same PS state be set twice */
1147         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1148         if ((start && in_ps) || (!start && !in_ps))
1149                 return -EINVAL;
1150
1151         if (start)
1152                 sta_ps_start(sta_inf);
1153         else
1154                 sta_ps_end(sta_inf);
1155
1156         return 0;
1157 }
1158 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1159
1160 static ieee80211_rx_result debug_noinline
1161 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1162 {
1163         struct ieee80211_sub_if_data *sdata = rx->sdata;
1164         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1165         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1166         int tid, ac;
1167
1168         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1169                 return RX_CONTINUE;
1170
1171         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1172             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1173                 return RX_CONTINUE;
1174
1175         /*
1176          * The device handles station powersave, so don't do anything about
1177          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1178          * it to mac80211 since they're handled.)
1179          */
1180         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1181                 return RX_CONTINUE;
1182
1183         /*
1184          * Don't do anything if the station isn't already asleep. In
1185          * the uAPSD case, the station will probably be marked asleep,
1186          * in the PS-Poll case the station must be confused ...
1187          */
1188         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1189                 return RX_CONTINUE;
1190
1191         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1192                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1193                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1194                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1195                         else
1196                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1197                 }
1198
1199                 /* Free PS Poll skb here instead of returning RX_DROP that would
1200                  * count as an dropped frame. */
1201                 dev_kfree_skb(rx->skb);
1202
1203                 return RX_QUEUED;
1204         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1205                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1206                    ieee80211_has_pm(hdr->frame_control) &&
1207                    (ieee80211_is_data_qos(hdr->frame_control) ||
1208                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1209                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1210                 ac = ieee802_1d_to_ac[tid & 7];
1211
1212                 /*
1213                  * If this AC is not trigger-enabled do nothing.
1214                  *
1215                  * NB: This could/should check a separate bitmap of trigger-
1216                  * enabled queues, but for now we only implement uAPSD w/o
1217                  * TSPEC changes to the ACs, so they're always the same.
1218                  */
1219                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1220                         return RX_CONTINUE;
1221
1222                 /* if we are in a service period, do nothing */
1223                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1224                         return RX_CONTINUE;
1225
1226                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1227                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1228                 else
1229                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1230         }
1231
1232         return RX_CONTINUE;
1233 }
1234
1235 static ieee80211_rx_result debug_noinline
1236 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1237 {
1238         struct sta_info *sta = rx->sta;
1239         struct sk_buff *skb = rx->skb;
1240         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1241         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1242         int i;
1243
1244         if (!sta)
1245                 return RX_CONTINUE;
1246
1247         /*
1248          * Update last_rx only for IBSS packets which are for the current
1249          * BSSID and for station already AUTHORIZED to avoid keeping the
1250          * current IBSS network alive in cases where other STAs start
1251          * using different BSSID. This will also give the station another
1252          * chance to restart the authentication/authorization in case
1253          * something went wrong the first time.
1254          */
1255         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1256                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1257                                                 NL80211_IFTYPE_ADHOC);
1258                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1259                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1260                         sta->last_rx = jiffies;
1261                         if (ieee80211_is_data(hdr->frame_control)) {
1262                                 sta->last_rx_rate_idx = status->rate_idx;
1263                                 sta->last_rx_rate_flag = status->flag;
1264                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1265                         }
1266                 }
1267         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1268                 /*
1269                  * Mesh beacons will update last_rx when if they are found to
1270                  * match the current local configuration when processed.
1271                  */
1272                 sta->last_rx = jiffies;
1273                 if (ieee80211_is_data(hdr->frame_control)) {
1274                         sta->last_rx_rate_idx = status->rate_idx;
1275                         sta->last_rx_rate_flag = status->flag;
1276                         sta->last_rx_rate_vht_nss = status->vht_nss;
1277                 }
1278         }
1279
1280         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1281                 return RX_CONTINUE;
1282
1283         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1284                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1285
1286         sta->rx_fragments++;
1287         sta->rx_bytes += rx->skb->len;
1288         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1289                 sta->last_signal = status->signal;
1290                 ewma_add(&sta->avg_signal, -status->signal);
1291         }
1292
1293         if (status->chains) {
1294                 sta->chains = status->chains;
1295                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1296                         int signal = status->chain_signal[i];
1297
1298                         if (!(status->chains & BIT(i)))
1299                                 continue;
1300
1301                         sta->chain_signal_last[i] = signal;
1302                         ewma_add(&sta->chain_signal_avg[i], -signal);
1303                 }
1304         }
1305
1306         /*
1307          * Change STA power saving mode only at the end of a frame
1308          * exchange sequence.
1309          */
1310         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1311             !ieee80211_has_morefrags(hdr->frame_control) &&
1312             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1313             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1314              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1315                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1316                         /*
1317                          * Ignore doze->wake transitions that are
1318                          * indicated by non-data frames, the standard
1319                          * is unclear here, but for example going to
1320                          * PS mode and then scanning would cause a
1321                          * doze->wake transition for the probe request,
1322                          * and that is clearly undesirable.
1323                          */
1324                         if (ieee80211_is_data(hdr->frame_control) &&
1325                             !ieee80211_has_pm(hdr->frame_control))
1326                                 sta_ps_end(sta);
1327                 } else {
1328                         if (ieee80211_has_pm(hdr->frame_control))
1329                                 sta_ps_start(sta);
1330                 }
1331         }
1332
1333         /* mesh power save support */
1334         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1335                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1336
1337         /*
1338          * Drop (qos-)data::nullfunc frames silently, since they
1339          * are used only to control station power saving mode.
1340          */
1341         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1343                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1344
1345                 /*
1346                  * If we receive a 4-addr nullfunc frame from a STA
1347                  * that was not moved to a 4-addr STA vlan yet send
1348                  * the event to userspace and for older hostapd drop
1349                  * the frame to the monitor interface.
1350                  */
1351                 if (ieee80211_has_a4(hdr->frame_control) &&
1352                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1354                       !rx->sdata->u.vlan.sta))) {
1355                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356                                 cfg80211_rx_unexpected_4addr_frame(
1357                                         rx->sdata->dev, sta->sta.addr,
1358                                         GFP_ATOMIC);
1359                         return RX_DROP_MONITOR;
1360                 }
1361                 /*
1362                  * Update counter and free packet here to avoid
1363                  * counting this as a dropped packed.
1364                  */
1365                 sta->rx_packets++;
1366                 dev_kfree_skb(rx->skb);
1367                 return RX_QUEUED;
1368         }
1369
1370         return RX_CONTINUE;
1371 } /* ieee80211_rx_h_sta_process */
1372
1373 static ieee80211_rx_result debug_noinline
1374 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1375 {
1376         struct sk_buff *skb = rx->skb;
1377         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1378         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1379         int keyidx;
1380         int hdrlen;
1381         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1382         struct ieee80211_key *sta_ptk = NULL;
1383         int mmie_keyidx = -1;
1384         __le16 fc;
1385         const struct ieee80211_cipher_scheme *cs = NULL;
1386
1387         /*
1388          * Key selection 101
1389          *
1390          * There are four types of keys:
1391          *  - GTK (group keys)
1392          *  - IGTK (group keys for management frames)
1393          *  - PTK (pairwise keys)
1394          *  - STK (station-to-station pairwise keys)
1395          *
1396          * When selecting a key, we have to distinguish between multicast
1397          * (including broadcast) and unicast frames, the latter can only
1398          * use PTKs and STKs while the former always use GTKs and IGTKs.
1399          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1400          * unicast frames can also use key indices like GTKs. Hence, if we
1401          * don't have a PTK/STK we check the key index for a WEP key.
1402          *
1403          * Note that in a regular BSS, multicast frames are sent by the
1404          * AP only, associated stations unicast the frame to the AP first
1405          * which then multicasts it on their behalf.
1406          *
1407          * There is also a slight problem in IBSS mode: GTKs are negotiated
1408          * with each station, that is something we don't currently handle.
1409          * The spec seems to expect that one negotiates the same key with
1410          * every station but there's no such requirement; VLANs could be
1411          * possible.
1412          */
1413
1414         /*
1415          * No point in finding a key and decrypting if the frame is neither
1416          * addressed to us nor a multicast frame.
1417          */
1418         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1419                 return RX_CONTINUE;
1420
1421         /* start without a key */
1422         rx->key = NULL;
1423         fc = hdr->frame_control;
1424
1425         if (rx->sta) {
1426                 int keyid = rx->sta->ptk_idx;
1427
1428                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1429                         cs = rx->sta->cipher_scheme;
1430                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1431                         if (unlikely(keyid < 0))
1432                                 return RX_DROP_UNUSABLE;
1433                 }
1434                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1435         }
1436
1437         if (!ieee80211_has_protected(fc))
1438                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1439
1440         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1441                 rx->key = sta_ptk;
1442                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1443                     (status->flag & RX_FLAG_IV_STRIPPED))
1444                         return RX_CONTINUE;
1445                 /* Skip decryption if the frame is not protected. */
1446                 if (!ieee80211_has_protected(fc))
1447                         return RX_CONTINUE;
1448         } else if (mmie_keyidx >= 0) {
1449                 /* Broadcast/multicast robust management frame / BIP */
1450                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1451                     (status->flag & RX_FLAG_IV_STRIPPED))
1452                         return RX_CONTINUE;
1453
1454                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1455                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1456                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1457                 if (rx->sta)
1458                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1459                 if (!rx->key)
1460                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1461         } else if (!ieee80211_has_protected(fc)) {
1462                 /*
1463                  * The frame was not protected, so skip decryption. However, we
1464                  * need to set rx->key if there is a key that could have been
1465                  * used so that the frame may be dropped if encryption would
1466                  * have been expected.
1467                  */
1468                 struct ieee80211_key *key = NULL;
1469                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1470                 int i;
1471
1472                 if (ieee80211_is_mgmt(fc) &&
1473                     is_multicast_ether_addr(hdr->addr1) &&
1474                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1475                         rx->key = key;
1476                 else {
1477                         if (rx->sta) {
1478                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1479                                         key = rcu_dereference(rx->sta->gtk[i]);
1480                                         if (key)
1481                                                 break;
1482                                 }
1483                         }
1484                         if (!key) {
1485                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1486                                         key = rcu_dereference(sdata->keys[i]);
1487                                         if (key)
1488                                                 break;
1489                                 }
1490                         }
1491                         if (key)
1492                                 rx->key = key;
1493                 }
1494                 return RX_CONTINUE;
1495         } else {
1496                 u8 keyid;
1497
1498                 /*
1499                  * The device doesn't give us the IV so we won't be
1500                  * able to look up the key. That's ok though, we
1501                  * don't need to decrypt the frame, we just won't
1502                  * be able to keep statistics accurate.
1503                  * Except for key threshold notifications, should
1504                  * we somehow allow the driver to tell us which key
1505                  * the hardware used if this flag is set?
1506                  */
1507                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1508                     (status->flag & RX_FLAG_IV_STRIPPED))
1509                         return RX_CONTINUE;
1510
1511                 hdrlen = ieee80211_hdrlen(fc);
1512
1513                 if (cs) {
1514                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1515
1516                         if (unlikely(keyidx < 0))
1517                                 return RX_DROP_UNUSABLE;
1518                 } else {
1519                         if (rx->skb->len < 8 + hdrlen)
1520                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1521                         /*
1522                          * no need to call ieee80211_wep_get_keyidx,
1523                          * it verifies a bunch of things we've done already
1524                          */
1525                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1526                         keyidx = keyid >> 6;
1527                 }
1528
1529                 /* check per-station GTK first, if multicast packet */
1530                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1531                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1532
1533                 /* if not found, try default key */
1534                 if (!rx->key) {
1535                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1536
1537                         /*
1538                          * RSNA-protected unicast frames should always be
1539                          * sent with pairwise or station-to-station keys,
1540                          * but for WEP we allow using a key index as well.
1541                          */
1542                         if (rx->key &&
1543                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1544                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1545                             !is_multicast_ether_addr(hdr->addr1))
1546                                 rx->key = NULL;
1547                 }
1548         }
1549
1550         if (rx->key) {
1551                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1552                         return RX_DROP_MONITOR;
1553
1554                 rx->key->tx_rx_count++;
1555                 /* TODO: add threshold stuff again */
1556         } else {
1557                 return RX_DROP_MONITOR;
1558         }
1559
1560         switch (rx->key->conf.cipher) {
1561         case WLAN_CIPHER_SUITE_WEP40:
1562         case WLAN_CIPHER_SUITE_WEP104:
1563                 result = ieee80211_crypto_wep_decrypt(rx);
1564                 break;
1565         case WLAN_CIPHER_SUITE_TKIP:
1566                 result = ieee80211_crypto_tkip_decrypt(rx);
1567                 break;
1568         case WLAN_CIPHER_SUITE_CCMP:
1569                 result = ieee80211_crypto_ccmp_decrypt(rx);
1570                 break;
1571         case WLAN_CIPHER_SUITE_AES_CMAC:
1572                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1573                 break;
1574         default:
1575                 result = ieee80211_crypto_hw_decrypt(rx);
1576         }
1577
1578         /* the hdr variable is invalid after the decrypt handlers */
1579
1580         /* either the frame has been decrypted or will be dropped */
1581         status->flag |= RX_FLAG_DECRYPTED;
1582
1583         return result;
1584 }
1585
1586 static inline struct ieee80211_fragment_entry *
1587 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1588                          unsigned int frag, unsigned int seq, int rx_queue,
1589                          struct sk_buff **skb)
1590 {
1591         struct ieee80211_fragment_entry *entry;
1592
1593         entry = &sdata->fragments[sdata->fragment_next++];
1594         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1595                 sdata->fragment_next = 0;
1596
1597         if (!skb_queue_empty(&entry->skb_list))
1598                 __skb_queue_purge(&entry->skb_list);
1599
1600         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1601         *skb = NULL;
1602         entry->first_frag_time = jiffies;
1603         entry->seq = seq;
1604         entry->rx_queue = rx_queue;
1605         entry->last_frag = frag;
1606         entry->ccmp = 0;
1607         entry->extra_len = 0;
1608
1609         return entry;
1610 }
1611
1612 static inline struct ieee80211_fragment_entry *
1613 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1614                           unsigned int frag, unsigned int seq,
1615                           int rx_queue, struct ieee80211_hdr *hdr)
1616 {
1617         struct ieee80211_fragment_entry *entry;
1618         int i, idx;
1619
1620         idx = sdata->fragment_next;
1621         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1622                 struct ieee80211_hdr *f_hdr;
1623
1624                 idx--;
1625                 if (idx < 0)
1626                         idx = IEEE80211_FRAGMENT_MAX - 1;
1627
1628                 entry = &sdata->fragments[idx];
1629                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1630                     entry->rx_queue != rx_queue ||
1631                     entry->last_frag + 1 != frag)
1632                         continue;
1633
1634                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1635
1636                 /*
1637                  * Check ftype and addresses are equal, else check next fragment
1638                  */
1639                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1640                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1641                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1642                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1643                         continue;
1644
1645                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1646                         __skb_queue_purge(&entry->skb_list);
1647                         continue;
1648                 }
1649                 return entry;
1650         }
1651
1652         return NULL;
1653 }
1654
1655 static ieee80211_rx_result debug_noinline
1656 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1657 {
1658         struct ieee80211_hdr *hdr;
1659         u16 sc;
1660         __le16 fc;
1661         unsigned int frag, seq;
1662         struct ieee80211_fragment_entry *entry;
1663         struct sk_buff *skb;
1664         struct ieee80211_rx_status *status;
1665
1666         hdr = (struct ieee80211_hdr *)rx->skb->data;
1667         fc = hdr->frame_control;
1668
1669         if (ieee80211_is_ctl(fc))
1670                 return RX_CONTINUE;
1671
1672         sc = le16_to_cpu(hdr->seq_ctrl);
1673         frag = sc & IEEE80211_SCTL_FRAG;
1674
1675         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1676                    is_multicast_ether_addr(hdr->addr1))) {
1677                 /* not fragmented */
1678                 goto out;
1679         }
1680         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1681
1682         if (skb_linearize(rx->skb))
1683                 return RX_DROP_UNUSABLE;
1684
1685         /*
1686          *  skb_linearize() might change the skb->data and
1687          *  previously cached variables (in this case, hdr) need to
1688          *  be refreshed with the new data.
1689          */
1690         hdr = (struct ieee80211_hdr *)rx->skb->data;
1691         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1692
1693         if (frag == 0) {
1694                 /* This is the first fragment of a new frame. */
1695                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1696                                                  rx->seqno_idx, &(rx->skb));
1697                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1698                     ieee80211_has_protected(fc)) {
1699                         int queue = rx->security_idx;
1700                         /* Store CCMP PN so that we can verify that the next
1701                          * fragment has a sequential PN value. */
1702                         entry->ccmp = 1;
1703                         memcpy(entry->last_pn,
1704                                rx->key->u.ccmp.rx_pn[queue],
1705                                IEEE80211_CCMP_PN_LEN);
1706                 }
1707                 return RX_QUEUED;
1708         }
1709
1710         /* This is a fragment for a frame that should already be pending in
1711          * fragment cache. Add this fragment to the end of the pending entry.
1712          */
1713         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1714                                           rx->seqno_idx, hdr);
1715         if (!entry) {
1716                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1717                 return RX_DROP_MONITOR;
1718         }
1719
1720         /* Verify that MPDUs within one MSDU have sequential PN values.
1721          * (IEEE 802.11i, 8.3.3.4.5) */
1722         if (entry->ccmp) {
1723                 int i;
1724                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1725                 int queue;
1726                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1727                         return RX_DROP_UNUSABLE;
1728                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1729                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1730                         pn[i]++;
1731                         if (pn[i])
1732                                 break;
1733                 }
1734                 queue = rx->security_idx;
1735                 rpn = rx->key->u.ccmp.rx_pn[queue];
1736                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1737                         return RX_DROP_UNUSABLE;
1738                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1739         }
1740
1741         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1742         __skb_queue_tail(&entry->skb_list, rx->skb);
1743         entry->last_frag = frag;
1744         entry->extra_len += rx->skb->len;
1745         if (ieee80211_has_morefrags(fc)) {
1746                 rx->skb = NULL;
1747                 return RX_QUEUED;
1748         }
1749
1750         rx->skb = __skb_dequeue(&entry->skb_list);
1751         if (skb_tailroom(rx->skb) < entry->extra_len) {
1752                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1753                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1754                                               GFP_ATOMIC))) {
1755                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1756                         __skb_queue_purge(&entry->skb_list);
1757                         return RX_DROP_UNUSABLE;
1758                 }
1759         }
1760         while ((skb = __skb_dequeue(&entry->skb_list))) {
1761                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1762                 dev_kfree_skb(skb);
1763         }
1764
1765         /* Complete frame has been reassembled - process it now */
1766         status = IEEE80211_SKB_RXCB(rx->skb);
1767         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1768
1769  out:
1770         if (rx->sta)
1771                 rx->sta->rx_packets++;
1772         if (is_multicast_ether_addr(hdr->addr1))
1773                 rx->local->dot11MulticastReceivedFrameCount++;
1774         else
1775                 ieee80211_led_rx(rx->local);
1776         return RX_CONTINUE;
1777 }
1778
1779 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1780 {
1781         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1782                 return -EACCES;
1783
1784         return 0;
1785 }
1786
1787 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1788 {
1789         struct sk_buff *skb = rx->skb;
1790         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1791
1792         /*
1793          * Pass through unencrypted frames if the hardware has
1794          * decrypted them already.
1795          */
1796         if (status->flag & RX_FLAG_DECRYPTED)
1797                 return 0;
1798
1799         /* Drop unencrypted frames if key is set. */
1800         if (unlikely(!ieee80211_has_protected(fc) &&
1801                      !ieee80211_is_nullfunc(fc) &&
1802                      ieee80211_is_data(fc) &&
1803                      (rx->key || rx->sdata->drop_unencrypted)))
1804                 return -EACCES;
1805
1806         return 0;
1807 }
1808
1809 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1810 {
1811         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1812         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1813         __le16 fc = hdr->frame_control;
1814
1815         /*
1816          * Pass through unencrypted frames if the hardware has
1817          * decrypted them already.
1818          */
1819         if (status->flag & RX_FLAG_DECRYPTED)
1820                 return 0;
1821
1822         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1823                 if (unlikely(!ieee80211_has_protected(fc) &&
1824                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1825                              rx->key)) {
1826                         if (ieee80211_is_deauth(fc) ||
1827                             ieee80211_is_disassoc(fc))
1828                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1829                                                              rx->skb->data,
1830                                                              rx->skb->len);
1831                         return -EACCES;
1832                 }
1833                 /* BIP does not use Protected field, so need to check MMIE */
1834                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1835                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1836                         if (ieee80211_is_deauth(fc) ||
1837                             ieee80211_is_disassoc(fc))
1838                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1839                                                              rx->skb->data,
1840                                                              rx->skb->len);
1841                         return -EACCES;
1842                 }
1843                 /*
1844                  * When using MFP, Action frames are not allowed prior to
1845                  * having configured keys.
1846                  */
1847                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1848                              ieee80211_is_robust_mgmt_frame(
1849                                      (struct ieee80211_hdr *) rx->skb->data)))
1850                         return -EACCES;
1851         }
1852
1853         return 0;
1854 }
1855
1856 static int
1857 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1858 {
1859         struct ieee80211_sub_if_data *sdata = rx->sdata;
1860         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1861         bool check_port_control = false;
1862         struct ethhdr *ehdr;
1863         int ret;
1864
1865         *port_control = false;
1866         if (ieee80211_has_a4(hdr->frame_control) &&
1867             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1868                 return -1;
1869
1870         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1871             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1872
1873                 if (!sdata->u.mgd.use_4addr)
1874                         return -1;
1875                 else
1876                         check_port_control = true;
1877         }
1878
1879         if (is_multicast_ether_addr(hdr->addr1) &&
1880             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1881                 return -1;
1882
1883         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1884         if (ret < 0)
1885                 return ret;
1886
1887         ehdr = (struct ethhdr *) rx->skb->data;
1888         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1889                 *port_control = true;
1890         else if (check_port_control)
1891                 return -1;
1892
1893         return 0;
1894 }
1895
1896 /*
1897  * requires that rx->skb is a frame with ethernet header
1898  */
1899 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1900 {
1901         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1902                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1903         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1904
1905         /*
1906          * Allow EAPOL frames to us/the PAE group address regardless
1907          * of whether the frame was encrypted or not.
1908          */
1909         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1910             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1911              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1912                 return true;
1913
1914         if (ieee80211_802_1x_port_control(rx) ||
1915             ieee80211_drop_unencrypted(rx, fc))
1916                 return false;
1917
1918         return true;
1919 }
1920
1921 /*
1922  * requires that rx->skb is a frame with ethernet header
1923  */
1924 static void
1925 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1926 {
1927         struct ieee80211_sub_if_data *sdata = rx->sdata;
1928         struct net_device *dev = sdata->dev;
1929         struct sk_buff *skb, *xmit_skb;
1930         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1931         struct sta_info *dsta;
1932         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1933
1934         skb = rx->skb;
1935         xmit_skb = NULL;
1936
1937         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1938              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1939             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1940             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1941             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1942                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1943                         /*
1944                          * send multicast frames both to higher layers in
1945                          * local net stack and back to the wireless medium
1946                          */
1947                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1948                         if (!xmit_skb)
1949                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1950                                                     dev->name);
1951                 } else {
1952                         dsta = sta_info_get(sdata, skb->data);
1953                         if (dsta) {
1954                                 /*
1955                                  * The destination station is associated to
1956                                  * this AP (in this VLAN), so send the frame
1957                                  * directly to it and do not pass it to local
1958                                  * net stack.
1959                                  */
1960                                 xmit_skb = skb;
1961                                 skb = NULL;
1962                         }
1963                 }
1964         }
1965
1966 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1967         if (skb) {
1968                 /* 'align' will only take the values 0 or 2 here since all
1969                  * frames are required to be aligned to 2-byte boundaries
1970                  * when being passed to mac80211; the code here works just
1971                  * as well if that isn't true, but mac80211 assumes it can
1972                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1973                  */
1974                 int align;
1975
1976                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1977                 if (align) {
1978                         if (WARN_ON(skb_headroom(skb) < 3)) {
1979                                 dev_kfree_skb(skb);
1980                                 skb = NULL;
1981                         } else {
1982                                 u8 *data = skb->data;
1983                                 size_t len = skb_headlen(skb);
1984                                 skb->data -= align;
1985                                 memmove(skb->data, data, len);
1986                                 skb_set_tail_pointer(skb, len);
1987                         }
1988                 }
1989         }
1990 #endif
1991
1992         if (skb) {
1993                 /* deliver to local stack */
1994                 skb->protocol = eth_type_trans(skb, dev);
1995                 memset(skb->cb, 0, sizeof(skb->cb));
1996                 netif_receive_skb(skb);
1997         }
1998
1999         if (xmit_skb) {
2000                 /*
2001                  * Send to wireless media and increase priority by 256 to
2002                  * keep the received priority instead of reclassifying
2003                  * the frame (see cfg80211_classify8021d).
2004                  */
2005                 xmit_skb->priority += 256;
2006                 xmit_skb->protocol = htons(ETH_P_802_3);
2007                 skb_reset_network_header(xmit_skb);
2008                 skb_reset_mac_header(xmit_skb);
2009                 dev_queue_xmit(xmit_skb);
2010         }
2011 }
2012
2013 static ieee80211_rx_result debug_noinline
2014 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2015 {
2016         struct net_device *dev = rx->sdata->dev;
2017         struct sk_buff *skb = rx->skb;
2018         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2019         __le16 fc = hdr->frame_control;
2020         struct sk_buff_head frame_list;
2021         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2022
2023         if (unlikely(!ieee80211_is_data(fc)))
2024                 return RX_CONTINUE;
2025
2026         if (unlikely(!ieee80211_is_data_present(fc)))
2027                 return RX_DROP_MONITOR;
2028
2029         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2030                 return RX_CONTINUE;
2031
2032         if (ieee80211_has_a4(hdr->frame_control) &&
2033             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2034             !rx->sdata->u.vlan.sta)
2035                 return RX_DROP_UNUSABLE;
2036
2037         if (is_multicast_ether_addr(hdr->addr1) &&
2038             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2039               rx->sdata->u.vlan.sta) ||
2040              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2041               rx->sdata->u.mgd.use_4addr)))
2042                 return RX_DROP_UNUSABLE;
2043
2044         skb->dev = dev;
2045         __skb_queue_head_init(&frame_list);
2046
2047         if (skb_linearize(skb))
2048                 return RX_DROP_UNUSABLE;
2049
2050         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2051                                  rx->sdata->vif.type,
2052                                  rx->local->hw.extra_tx_headroom, true);
2053
2054         while (!skb_queue_empty(&frame_list)) {
2055                 rx->skb = __skb_dequeue(&frame_list);
2056
2057                 if (!ieee80211_frame_allowed(rx, fc)) {
2058                         dev_kfree_skb(rx->skb);
2059                         continue;
2060                 }
2061                 dev->stats.rx_packets++;
2062                 dev->stats.rx_bytes += rx->skb->len;
2063
2064                 ieee80211_deliver_skb(rx);
2065         }
2066
2067         return RX_QUEUED;
2068 }
2069
2070 #ifdef CONFIG_MAC80211_MESH
2071 static ieee80211_rx_result
2072 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2073 {
2074         struct ieee80211_hdr *fwd_hdr, *hdr;
2075         struct ieee80211_tx_info *info;
2076         struct ieee80211s_hdr *mesh_hdr;
2077         struct sk_buff *skb = rx->skb, *fwd_skb;
2078         struct ieee80211_local *local = rx->local;
2079         struct ieee80211_sub_if_data *sdata = rx->sdata;
2080         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2081         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2082         u16 q, hdrlen;
2083
2084         hdr = (struct ieee80211_hdr *) skb->data;
2085         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2086
2087         /* make sure fixed part of mesh header is there, also checks skb len */
2088         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2089                 return RX_DROP_MONITOR;
2090
2091         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2092
2093         /* make sure full mesh header is there, also checks skb len */
2094         if (!pskb_may_pull(rx->skb,
2095                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2096                 return RX_DROP_MONITOR;
2097
2098         /* reload pointers */
2099         hdr = (struct ieee80211_hdr *) skb->data;
2100         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2101
2102         /* frame is in RMC, don't forward */
2103         if (ieee80211_is_data(hdr->frame_control) &&
2104             is_multicast_ether_addr(hdr->addr1) &&
2105             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2106                 return RX_DROP_MONITOR;
2107
2108         if (!ieee80211_is_data(hdr->frame_control) ||
2109             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2110                 return RX_CONTINUE;
2111
2112         if (!mesh_hdr->ttl)
2113                 return RX_DROP_MONITOR;
2114
2115         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2116                 struct mesh_path *mppath;
2117                 char *proxied_addr;
2118                 char *mpp_addr;
2119
2120                 if (is_multicast_ether_addr(hdr->addr1)) {
2121                         mpp_addr = hdr->addr3;
2122                         proxied_addr = mesh_hdr->eaddr1;
2123                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2124                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2125                         mpp_addr = hdr->addr4;
2126                         proxied_addr = mesh_hdr->eaddr2;
2127                 } else {
2128                         return RX_DROP_MONITOR;
2129                 }
2130
2131                 rcu_read_lock();
2132                 mppath = mpp_path_lookup(sdata, proxied_addr);
2133                 if (!mppath) {
2134                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2135                 } else {
2136                         spin_lock_bh(&mppath->state_lock);
2137                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2138                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2139                         spin_unlock_bh(&mppath->state_lock);
2140                 }
2141                 rcu_read_unlock();
2142         }
2143
2144         /* Frame has reached destination.  Don't forward */
2145         if (!is_multicast_ether_addr(hdr->addr1) &&
2146             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2147                 return RX_CONTINUE;
2148
2149         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2150         if (ieee80211_queue_stopped(&local->hw, q)) {
2151                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2152                 return RX_DROP_MONITOR;
2153         }
2154         skb_set_queue_mapping(skb, q);
2155
2156         if (!--mesh_hdr->ttl) {
2157                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2158                 goto out;
2159         }
2160
2161         if (!ifmsh->mshcfg.dot11MeshForwarding)
2162                 goto out;
2163
2164         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2165         if (!fwd_skb) {
2166                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2167                                     sdata->name);
2168                 goto out;
2169         }
2170
2171         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2172         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2173         info = IEEE80211_SKB_CB(fwd_skb);
2174         memset(info, 0, sizeof(*info));
2175         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2176         info->control.vif = &rx->sdata->vif;
2177         info->control.jiffies = jiffies;
2178         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2179                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2180                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2181                 /* update power mode indication when forwarding */
2182                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2183         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2184                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2185                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2186         } else {
2187                 /* unable to resolve next hop */
2188                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2189                                    fwd_hdr->addr3, 0,
2190                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2191                                    fwd_hdr->addr2);
2192                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2193                 kfree_skb(fwd_skb);
2194                 return RX_DROP_MONITOR;
2195         }
2196
2197         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2198         ieee80211_add_pending_skb(local, fwd_skb);
2199  out:
2200         if (is_multicast_ether_addr(hdr->addr1) ||
2201             sdata->dev->flags & IFF_PROMISC)
2202                 return RX_CONTINUE;
2203         else
2204                 return RX_DROP_MONITOR;
2205 }
2206 #endif
2207
2208 static ieee80211_rx_result debug_noinline
2209 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2210 {
2211         struct ieee80211_sub_if_data *sdata = rx->sdata;
2212         struct ieee80211_local *local = rx->local;
2213         struct net_device *dev = sdata->dev;
2214         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2215         __le16 fc = hdr->frame_control;
2216         bool port_control;
2217         int err;
2218
2219         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2220                 return RX_CONTINUE;
2221
2222         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2223                 return RX_DROP_MONITOR;
2224
2225         /*
2226          * Send unexpected-4addr-frame event to hostapd. For older versions,
2227          * also drop the frame to cooked monitor interfaces.
2228          */
2229         if (ieee80211_has_a4(hdr->frame_control) &&
2230             sdata->vif.type == NL80211_IFTYPE_AP) {
2231                 if (rx->sta &&
2232                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2233                         cfg80211_rx_unexpected_4addr_frame(
2234                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2235                 return RX_DROP_MONITOR;
2236         }
2237
2238         err = __ieee80211_data_to_8023(rx, &port_control);
2239         if (unlikely(err))
2240                 return RX_DROP_UNUSABLE;
2241
2242         if (!ieee80211_frame_allowed(rx, fc))
2243                 return RX_DROP_MONITOR;
2244
2245         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2246             unlikely(port_control) && sdata->bss) {
2247                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2248                                      u.ap);
2249                 dev = sdata->dev;
2250                 rx->sdata = sdata;
2251         }
2252
2253         rx->skb->dev = dev;
2254
2255         dev->stats.rx_packets++;
2256         dev->stats.rx_bytes += rx->skb->len;
2257
2258         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2259             !is_multicast_ether_addr(
2260                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2261             (!local->scanning &&
2262              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2263                         mod_timer(&local->dynamic_ps_timer, jiffies +
2264                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2265         }
2266
2267         ieee80211_deliver_skb(rx);
2268
2269         return RX_QUEUED;
2270 }
2271
2272 static ieee80211_rx_result debug_noinline
2273 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2274 {
2275         struct sk_buff *skb = rx->skb;
2276         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2277         struct tid_ampdu_rx *tid_agg_rx;
2278         u16 start_seq_num;
2279         u16 tid;
2280
2281         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2282                 return RX_CONTINUE;
2283
2284         if (ieee80211_is_back_req(bar->frame_control)) {
2285                 struct {
2286                         __le16 control, start_seq_num;
2287                 } __packed bar_data;
2288
2289                 if (!rx->sta)
2290                         return RX_DROP_MONITOR;
2291
2292                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2293                                   &bar_data, sizeof(bar_data)))
2294                         return RX_DROP_MONITOR;
2295
2296                 tid = le16_to_cpu(bar_data.control) >> 12;
2297
2298                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2299                 if (!tid_agg_rx)
2300                         return RX_DROP_MONITOR;
2301
2302                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2303
2304                 /* reset session timer */
2305                 if (tid_agg_rx->timeout)
2306                         mod_timer(&tid_agg_rx->session_timer,
2307                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2308
2309                 spin_lock(&tid_agg_rx->reorder_lock);
2310                 /* release stored frames up to start of BAR */
2311                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2312                                                  start_seq_num, frames);
2313                 spin_unlock(&tid_agg_rx->reorder_lock);
2314
2315                 kfree_skb(skb);
2316                 return RX_QUEUED;
2317         }
2318
2319         /*
2320          * After this point, we only want management frames,
2321          * so we can drop all remaining control frames to
2322          * cooked monitor interfaces.
2323          */
2324         return RX_DROP_MONITOR;
2325 }
2326
2327 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2328                                            struct ieee80211_mgmt *mgmt,
2329                                            size_t len)
2330 {
2331         struct ieee80211_local *local = sdata->local;
2332         struct sk_buff *skb;
2333         struct ieee80211_mgmt *resp;
2334
2335         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2336                 /* Not to own unicast address */
2337                 return;
2338         }
2339
2340         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2341             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2342                 /* Not from the current AP or not associated yet. */
2343                 return;
2344         }
2345
2346         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2347                 /* Too short SA Query request frame */
2348                 return;
2349         }
2350
2351         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2352         if (skb == NULL)
2353                 return;
2354
2355         skb_reserve(skb, local->hw.extra_tx_headroom);
2356         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2357         memset(resp, 0, 24);
2358         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2359         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2360         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2361         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2362                                           IEEE80211_STYPE_ACTION);
2363         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2364         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2365         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2366         memcpy(resp->u.action.u.sa_query.trans_id,
2367                mgmt->u.action.u.sa_query.trans_id,
2368                WLAN_SA_QUERY_TR_ID_LEN);
2369
2370         ieee80211_tx_skb(sdata, skb);
2371 }
2372
2373 static ieee80211_rx_result debug_noinline
2374 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2375 {
2376         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2377         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2378
2379         /*
2380          * From here on, look only at management frames.
2381          * Data and control frames are already handled,
2382          * and unknown (reserved) frames are useless.
2383          */
2384         if (rx->skb->len < 24)
2385                 return RX_DROP_MONITOR;
2386
2387         if (!ieee80211_is_mgmt(mgmt->frame_control))
2388                 return RX_DROP_MONITOR;
2389
2390         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2391             ieee80211_is_beacon(mgmt->frame_control) &&
2392             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2393                 int sig = 0;
2394
2395                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2396                         sig = status->signal;
2397
2398                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2399                                             rx->skb->data, rx->skb->len,
2400                                             status->freq, sig);
2401                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2402         }
2403
2404         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2405                 return RX_DROP_MONITOR;
2406
2407         if (ieee80211_drop_unencrypted_mgmt(rx))
2408                 return RX_DROP_UNUSABLE;
2409
2410         return RX_CONTINUE;
2411 }
2412
2413 static ieee80211_rx_result debug_noinline
2414 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2415 {
2416         struct ieee80211_local *local = rx->local;
2417         struct ieee80211_sub_if_data *sdata = rx->sdata;
2418         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2419         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2420         int len = rx->skb->len;
2421
2422         if (!ieee80211_is_action(mgmt->frame_control))
2423                 return RX_CONTINUE;
2424
2425         /* drop too small frames */
2426         if (len < IEEE80211_MIN_ACTION_SIZE)
2427                 return RX_DROP_UNUSABLE;
2428
2429         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2430             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2431             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2432                 return RX_DROP_UNUSABLE;
2433
2434         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2435                 return RX_DROP_UNUSABLE;
2436
2437         switch (mgmt->u.action.category) {
2438         case WLAN_CATEGORY_HT:
2439                 /* reject HT action frames from stations not supporting HT */
2440                 if (!rx->sta->sta.ht_cap.ht_supported)
2441                         goto invalid;
2442
2443                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2444                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2445                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2446                     sdata->vif.type != NL80211_IFTYPE_AP &&
2447                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2448                         break;
2449
2450                 /* verify action & smps_control/chanwidth are present */
2451                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2452                         goto invalid;
2453
2454                 switch (mgmt->u.action.u.ht_smps.action) {
2455                 case WLAN_HT_ACTION_SMPS: {
2456                         struct ieee80211_supported_band *sband;
2457                         enum ieee80211_smps_mode smps_mode;
2458
2459                         /* convert to HT capability */
2460                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2461                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2462                                 smps_mode = IEEE80211_SMPS_OFF;
2463                                 break;
2464                         case WLAN_HT_SMPS_CONTROL_STATIC:
2465                                 smps_mode = IEEE80211_SMPS_STATIC;
2466                                 break;
2467                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2468                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2469                                 break;
2470                         default:
2471                                 goto invalid;
2472                         }
2473
2474                         /* if no change do nothing */
2475                         if (rx->sta->sta.smps_mode == smps_mode)
2476                                 goto handled;
2477                         rx->sta->sta.smps_mode = smps_mode;
2478
2479                         sband = rx->local->hw.wiphy->bands[status->band];
2480
2481                         rate_control_rate_update(local, sband, rx->sta,
2482                                                  IEEE80211_RC_SMPS_CHANGED);
2483                         goto handled;
2484                 }
2485                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2486                         struct ieee80211_supported_band *sband;
2487                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2488                         enum ieee80211_sta_rx_bandwidth new_bw;
2489
2490                         /* If it doesn't support 40 MHz it can't change ... */
2491                         if (!(rx->sta->sta.ht_cap.cap &
2492                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2493                                 goto handled;
2494
2495                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2496                                 new_bw = IEEE80211_STA_RX_BW_20;
2497                         else
2498                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2499
2500                         if (rx->sta->sta.bandwidth == new_bw)
2501                                 goto handled;
2502
2503                         sband = rx->local->hw.wiphy->bands[status->band];
2504
2505                         rate_control_rate_update(local, sband, rx->sta,
2506                                                  IEEE80211_RC_BW_CHANGED);
2507                         goto handled;
2508                 }
2509                 default:
2510                         goto invalid;
2511                 }
2512
2513                 break;
2514         case WLAN_CATEGORY_PUBLIC:
2515                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2516                         goto invalid;
2517                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2518                         break;
2519                 if (!rx->sta)
2520                         break;
2521                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2522                         break;
2523                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2524                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2525                         break;
2526                 if (len < offsetof(struct ieee80211_mgmt,
2527                                    u.action.u.ext_chan_switch.variable))
2528                         goto invalid;
2529                 goto queue;
2530         case WLAN_CATEGORY_VHT:
2531                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2532                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2533                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2534                     sdata->vif.type != NL80211_IFTYPE_AP &&
2535                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2536                         break;
2537
2538                 /* verify action code is present */
2539                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2540                         goto invalid;
2541
2542                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2543                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2544                         u8 opmode;
2545
2546                         /* verify opmode is present */
2547                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2548                                 goto invalid;
2549
2550                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2551
2552                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2553                                                     opmode, status->band,
2554                                                     false);
2555                         goto handled;
2556                 }
2557                 default:
2558                         break;
2559                 }
2560                 break;
2561         case WLAN_CATEGORY_BACK:
2562                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2563                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2564                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2565                     sdata->vif.type != NL80211_IFTYPE_AP &&
2566                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2567                         break;
2568
2569                 /* verify action_code is present */
2570                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2571                         break;
2572
2573                 switch (mgmt->u.action.u.addba_req.action_code) {
2574                 case WLAN_ACTION_ADDBA_REQ:
2575                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2576                                    sizeof(mgmt->u.action.u.addba_req)))
2577                                 goto invalid;
2578                         break;
2579                 case WLAN_ACTION_ADDBA_RESP:
2580                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2581                                    sizeof(mgmt->u.action.u.addba_resp)))
2582                                 goto invalid;
2583                         break;
2584                 case WLAN_ACTION_DELBA:
2585                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2586                                    sizeof(mgmt->u.action.u.delba)))
2587                                 goto invalid;
2588                         break;
2589                 default:
2590                         goto invalid;
2591                 }
2592
2593                 goto queue;
2594         case WLAN_CATEGORY_SPECTRUM_MGMT:
2595                 /* verify action_code is present */
2596                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2597                         break;
2598
2599                 switch (mgmt->u.action.u.measurement.action_code) {
2600                 case WLAN_ACTION_SPCT_MSR_REQ:
2601                         if (status->band != IEEE80211_BAND_5GHZ)
2602                                 break;
2603
2604                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2605                                    sizeof(mgmt->u.action.u.measurement)))
2606                                 break;
2607
2608                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2609                                 break;
2610
2611                         ieee80211_process_measurement_req(sdata, mgmt, len);
2612                         goto handled;
2613                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2614                         u8 *bssid;
2615                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2616                                    sizeof(mgmt->u.action.u.chan_switch)))
2617                                 break;
2618
2619                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2620                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2621                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2622                                 break;
2623
2624                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2625                                 bssid = sdata->u.mgd.bssid;
2626                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2627                                 bssid = sdata->u.ibss.bssid;
2628                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2629                                 bssid = mgmt->sa;
2630                         else
2631                                 break;
2632
2633                         if (!ether_addr_equal(mgmt->bssid, bssid))
2634                                 break;
2635
2636                         goto queue;
2637                         }
2638                 }
2639                 break;
2640         case WLAN_CATEGORY_SA_QUERY:
2641                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2642                            sizeof(mgmt->u.action.u.sa_query)))
2643                         break;
2644
2645                 switch (mgmt->u.action.u.sa_query.action) {
2646                 case WLAN_ACTION_SA_QUERY_REQUEST:
2647                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2648                                 break;
2649                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2650                         goto handled;
2651                 }
2652                 break;
2653         case WLAN_CATEGORY_SELF_PROTECTED:
2654                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2655                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2656                         break;
2657
2658                 switch (mgmt->u.action.u.self_prot.action_code) {
2659                 case WLAN_SP_MESH_PEERING_OPEN:
2660                 case WLAN_SP_MESH_PEERING_CLOSE:
2661                 case WLAN_SP_MESH_PEERING_CONFIRM:
2662                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2663                                 goto invalid;
2664                         if (sdata->u.mesh.user_mpm)
2665                                 /* userspace handles this frame */
2666                                 break;
2667                         goto queue;
2668                 case WLAN_SP_MGK_INFORM:
2669                 case WLAN_SP_MGK_ACK:
2670                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2671                                 goto invalid;
2672                         break;
2673                 }
2674                 break;
2675         case WLAN_CATEGORY_MESH_ACTION:
2676                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2677                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2678                         break;
2679
2680                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2681                         break;
2682                 if (mesh_action_is_path_sel(mgmt) &&
2683                     !mesh_path_sel_is_hwmp(sdata))
2684                         break;
2685                 goto queue;
2686         }
2687
2688         return RX_CONTINUE;
2689
2690  invalid:
2691         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2692         /* will return in the next handlers */
2693         return RX_CONTINUE;
2694
2695  handled:
2696         if (rx->sta)
2697                 rx->sta->rx_packets++;
2698         dev_kfree_skb(rx->skb);
2699         return RX_QUEUED;
2700
2701  queue:
2702         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2703         skb_queue_tail(&sdata->skb_queue, rx->skb);
2704         ieee80211_queue_work(&local->hw, &sdata->work);
2705         if (rx->sta)
2706                 rx->sta->rx_packets++;
2707         return RX_QUEUED;
2708 }
2709
2710 static ieee80211_rx_result debug_noinline
2711 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2712 {
2713         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2714         int sig = 0;
2715
2716         /* skip known-bad action frames and return them in the next handler */
2717         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2718                 return RX_CONTINUE;
2719
2720         /*
2721          * Getting here means the kernel doesn't know how to handle
2722          * it, but maybe userspace does ... include returned frames
2723          * so userspace can register for those to know whether ones
2724          * it transmitted were processed or returned.
2725          */
2726
2727         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2728                 sig = status->signal;
2729
2730         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2731                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2732                 if (rx->sta)
2733                         rx->sta->rx_packets++;
2734                 dev_kfree_skb(rx->skb);
2735                 return RX_QUEUED;
2736         }
2737
2738         return RX_CONTINUE;
2739 }
2740
2741 static ieee80211_rx_result debug_noinline
2742 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2743 {
2744         struct ieee80211_local *local = rx->local;
2745         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2746         struct sk_buff *nskb;
2747         struct ieee80211_sub_if_data *sdata = rx->sdata;
2748         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2749
2750         if (!ieee80211_is_action(mgmt->frame_control))
2751                 return RX_CONTINUE;
2752
2753         /*
2754          * For AP mode, hostapd is responsible for handling any action
2755          * frames that we didn't handle, including returning unknown
2756          * ones. For all other modes we will return them to the sender,
2757          * setting the 0x80 bit in the action category, as required by
2758          * 802.11-2012 9.24.4.
2759          * Newer versions of hostapd shall also use the management frame
2760          * registration mechanisms, but older ones still use cooked
2761          * monitor interfaces so push all frames there.
2762          */
2763         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2764             (sdata->vif.type == NL80211_IFTYPE_AP ||
2765              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2766                 return RX_DROP_MONITOR;
2767
2768         if (is_multicast_ether_addr(mgmt->da))
2769                 return RX_DROP_MONITOR;
2770
2771         /* do not return rejected action frames */
2772         if (mgmt->u.action.category & 0x80)
2773                 return RX_DROP_UNUSABLE;
2774
2775         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2776                                GFP_ATOMIC);
2777         if (nskb) {
2778                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2779
2780                 nmgmt->u.action.category |= 0x80;
2781                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2782                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2783
2784                 memset(nskb->cb, 0, sizeof(nskb->cb));
2785
2786                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2787                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2788
2789                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2790                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2791                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2792                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2793                                 info->hw_queue =
2794                                         local->hw.offchannel_tx_hw_queue;
2795                 }
2796
2797                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2798                                             status->band);
2799         }
2800         dev_kfree_skb(rx->skb);
2801         return RX_QUEUED;
2802 }
2803
2804 static ieee80211_rx_result debug_noinline
2805 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2806 {
2807         struct ieee80211_sub_if_data *sdata = rx->sdata;
2808         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2809         __le16 stype;
2810
2811         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2812
2813         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2814             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2815             sdata->vif.type != NL80211_IFTYPE_STATION)
2816                 return RX_DROP_MONITOR;
2817
2818         switch (stype) {
2819         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2820         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2821         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2822                 /* process for all: mesh, mlme, ibss */
2823                 break;
2824         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2825         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2826         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2827         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2828                 if (is_multicast_ether_addr(mgmt->da) &&
2829                     !is_broadcast_ether_addr(mgmt->da))
2830                         return RX_DROP_MONITOR;
2831
2832                 /* process only for station */
2833                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2834                         return RX_DROP_MONITOR;
2835                 break;
2836         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2837                 /* process only for ibss and mesh */
2838                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2839                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2840                         return RX_DROP_MONITOR;
2841                 break;
2842         default:
2843                 return RX_DROP_MONITOR;
2844         }
2845
2846         /* queue up frame and kick off work to process it */
2847         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2848         skb_queue_tail(&sdata->skb_queue, rx->skb);
2849         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2850         if (rx->sta)
2851                 rx->sta->rx_packets++;
2852
2853         return RX_QUEUED;
2854 }
2855
2856 /* TODO: use IEEE80211_RX_FRAGMENTED */
2857 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2858                                         struct ieee80211_rate *rate)
2859 {
2860         struct ieee80211_sub_if_data *sdata;
2861         struct ieee80211_local *local = rx->local;
2862         struct sk_buff *skb = rx->skb, *skb2;
2863         struct net_device *prev_dev = NULL;
2864         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2865         int needed_headroom;
2866
2867         /*
2868          * If cooked monitor has been processed already, then
2869          * don't do it again. If not, set the flag.
2870          */
2871         if (rx->flags & IEEE80211_RX_CMNTR)
2872                 goto out_free_skb;
2873         rx->flags |= IEEE80211_RX_CMNTR;
2874
2875         /* If there are no cooked monitor interfaces, just free the SKB */
2876         if (!local->cooked_mntrs)
2877                 goto out_free_skb;
2878
2879         /* room for the radiotap header based on driver features */
2880         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2881
2882         if (skb_headroom(skb) < needed_headroom &&
2883             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2884                 goto out_free_skb;
2885
2886         /* prepend radiotap information */
2887         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2888                                          false);
2889
2890         skb_set_mac_header(skb, 0);
2891         skb->ip_summed = CHECKSUM_UNNECESSARY;
2892         skb->pkt_type = PACKET_OTHERHOST;
2893         skb->protocol = htons(ETH_P_802_2);
2894
2895         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2896                 if (!ieee80211_sdata_running(sdata))
2897                         continue;
2898
2899                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2900                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2901                         continue;
2902
2903                 if (prev_dev) {
2904                         skb2 = skb_clone(skb, GFP_ATOMIC);
2905                         if (skb2) {
2906                                 skb2->dev = prev_dev;
2907                                 netif_receive_skb(skb2);
2908                         }
2909                 }
2910
2911                 prev_dev = sdata->dev;
2912                 sdata->dev->stats.rx_packets++;
2913                 sdata->dev->stats.rx_bytes += skb->len;
2914         }
2915
2916         if (prev_dev) {
2917                 skb->dev = prev_dev;
2918                 netif_receive_skb(skb);
2919                 return;
2920         }
2921
2922  out_free_skb:
2923         dev_kfree_skb(skb);
2924 }
2925
2926 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2927                                          ieee80211_rx_result res)
2928 {
2929         switch (res) {
2930         case RX_DROP_MONITOR:
2931                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2932                 if (rx->sta)
2933                         rx->sta->rx_dropped++;
2934                 /* fall through */
2935         case RX_CONTINUE: {
2936                 struct ieee80211_rate *rate = NULL;
2937                 struct ieee80211_supported_band *sband;
2938                 struct ieee80211_rx_status *status;
2939
2940                 status = IEEE80211_SKB_RXCB((rx->skb));
2941
2942                 sband = rx->local->hw.wiphy->bands[status->band];
2943                 if (!(status->flag & RX_FLAG_HT) &&
2944                     !(status->flag & RX_FLAG_VHT))
2945                         rate = &sband->bitrates[status->rate_idx];
2946
2947                 ieee80211_rx_cooked_monitor(rx, rate);
2948                 break;
2949                 }
2950         case RX_DROP_UNUSABLE:
2951                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2952                 if (rx->sta)
2953                         rx->sta->rx_dropped++;
2954                 dev_kfree_skb(rx->skb);
2955                 break;
2956         case RX_QUEUED:
2957                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2958                 break;
2959         }
2960 }
2961
2962 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2963                                   struct sk_buff_head *frames)
2964 {
2965         ieee80211_rx_result res = RX_DROP_MONITOR;
2966         struct sk_buff *skb;
2967
2968 #define CALL_RXH(rxh)                   \
2969         do {                            \
2970                 res = rxh(rx);          \
2971                 if (res != RX_CONTINUE) \
2972                         goto rxh_next;  \
2973         } while (0);
2974
2975         spin_lock_bh(&rx->local->rx_path_lock);
2976
2977         while ((skb = __skb_dequeue(frames))) {
2978                 /*
2979                  * all the other fields are valid across frames
2980                  * that belong to an aMPDU since they are on the
2981                  * same TID from the same station
2982                  */
2983                 rx->skb = skb;
2984
2985                 CALL_RXH(ieee80211_rx_h_check_more_data)
2986                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2987                 CALL_RXH(ieee80211_rx_h_sta_process)
2988                 CALL_RXH(ieee80211_rx_h_decrypt)
2989                 CALL_RXH(ieee80211_rx_h_defragment)
2990                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2991                 /* must be after MMIC verify so header is counted in MPDU mic */
2992 #ifdef CONFIG_MAC80211_MESH
2993                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2994                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2995 #endif
2996                 CALL_RXH(ieee80211_rx_h_amsdu)
2997                 CALL_RXH(ieee80211_rx_h_data)
2998
2999                 /* special treatment -- needs the queue */
3000                 res = ieee80211_rx_h_ctrl(rx, frames);
3001                 if (res != RX_CONTINUE)
3002                         goto rxh_next;
3003
3004                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3005                 CALL_RXH(ieee80211_rx_h_action)
3006                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3007                 CALL_RXH(ieee80211_rx_h_action_return)
3008                 CALL_RXH(ieee80211_rx_h_mgmt)
3009
3010  rxh_next:
3011                 ieee80211_rx_handlers_result(rx, res);
3012
3013 #undef CALL_RXH
3014         }
3015
3016         spin_unlock_bh(&rx->local->rx_path_lock);
3017 }
3018
3019 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3020 {
3021         struct sk_buff_head reorder_release;
3022         ieee80211_rx_result res = RX_DROP_MONITOR;
3023
3024         __skb_queue_head_init(&reorder_release);
3025
3026 #define CALL_RXH(rxh)                   \
3027         do {                            \
3028                 res = rxh(rx);          \
3029                 if (res != RX_CONTINUE) \
3030                         goto rxh_next;  \
3031         } while (0);
3032
3033         CALL_RXH(ieee80211_rx_h_check)
3034
3035         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3036
3037         ieee80211_rx_handlers(rx, &reorder_release);
3038         return;
3039
3040  rxh_next:
3041         ieee80211_rx_handlers_result(rx, res);
3042
3043 #undef CALL_RXH
3044 }
3045
3046 /*
3047  * This function makes calls into the RX path, therefore
3048  * it has to be invoked under RCU read lock.
3049  */
3050 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3051 {
3052         struct sk_buff_head frames;
3053         struct ieee80211_rx_data rx = {
3054                 .sta = sta,
3055                 .sdata = sta->sdata,
3056                 .local = sta->local,
3057                 /* This is OK -- must be QoS data frame */
3058                 .security_idx = tid,
3059                 .seqno_idx = tid,
3060                 .flags = 0,
3061         };
3062         struct tid_ampdu_rx *tid_agg_rx;
3063
3064         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3065         if (!tid_agg_rx)
3066                 return;
3067
3068         __skb_queue_head_init(&frames);
3069
3070         spin_lock(&tid_agg_rx->reorder_lock);
3071         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3072         spin_unlock(&tid_agg_rx->reorder_lock);
3073
3074         ieee80211_rx_handlers(&rx, &frames);
3075 }
3076
3077 /* main receive path */
3078
3079 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3080                                  struct ieee80211_hdr *hdr)
3081 {
3082         struct ieee80211_sub_if_data *sdata = rx->sdata;
3083         struct sk_buff *skb = rx->skb;
3084         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3085         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3086         int multicast = is_multicast_ether_addr(hdr->addr1);
3087
3088         switch (sdata->vif.type) {
3089         case NL80211_IFTYPE_STATION:
3090                 if (!bssid && !sdata->u.mgd.use_4addr)
3091                         return false;
3092                 if (!multicast &&
3093                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3094                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3095                             sdata->u.mgd.use_4addr)
3096                                 return false;
3097                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3098                 }
3099                 break;
3100         case NL80211_IFTYPE_ADHOC:
3101                 if (!bssid)
3102                         return false;
3103                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3104                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3105                         return false;
3106                 if (ieee80211_is_beacon(hdr->frame_control)) {
3107                         return true;
3108                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3109                         return false;
3110                 } else if (!multicast &&
3111                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3112                         if (!(sdata->dev->flags & IFF_PROMISC))
3113                                 return false;
3114                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3115                 } else if (!rx->sta) {
3116                         int rate_idx;
3117                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3118                                 rate_idx = 0; /* TODO: HT/VHT rates */
3119                         else
3120                                 rate_idx = status->rate_idx;
3121                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3122                                                  BIT(rate_idx));
3123                 }
3124                 break;
3125         case NL80211_IFTYPE_MESH_POINT:
3126                 if (!multicast &&
3127                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3128                         if (!(sdata->dev->flags & IFF_PROMISC))
3129                                 return false;
3130
3131                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3132                 }
3133                 break;
3134         case NL80211_IFTYPE_AP_VLAN:
3135         case NL80211_IFTYPE_AP:
3136                 if (!bssid) {
3137                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3138                                 return false;
3139                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3140                         /*
3141                          * Accept public action frames even when the
3142                          * BSSID doesn't match, this is used for P2P
3143                          * and location updates. Note that mac80211
3144                          * itself never looks at these frames.
3145                          */
3146                         if (!multicast &&
3147                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3148                                 return false;
3149                         if (ieee80211_is_public_action(hdr, skb->len))
3150                                 return true;
3151                         if (!ieee80211_is_beacon(hdr->frame_control))
3152                                 return false;
3153                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3154                 }
3155                 break;
3156         case NL80211_IFTYPE_WDS:
3157                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3158                         return false;
3159                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3160                         return false;
3161                 break;
3162         case NL80211_IFTYPE_P2P_DEVICE:
3163                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3164                     !ieee80211_is_probe_req(hdr->frame_control) &&
3165                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3166                     !ieee80211_is_beacon(hdr->frame_control))
3167                         return false;
3168                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3169                     !multicast)
3170                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3171                 break;
3172         default:
3173                 /* should never get here */
3174                 WARN_ON_ONCE(1);
3175                 break;
3176         }
3177
3178         return true;
3179 }
3180
3181 /*
3182  * This function returns whether or not the SKB
3183  * was destined for RX processing or not, which,
3184  * if consume is true, is equivalent to whether
3185  * or not the skb was consumed.
3186  */
3187 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3188                                             struct sk_buff *skb, bool consume)
3189 {
3190         struct ieee80211_local *local = rx->local;
3191         struct ieee80211_sub_if_data *sdata = rx->sdata;
3192         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3193         struct ieee80211_hdr *hdr = (void *)skb->data;
3194
3195         rx->skb = skb;
3196         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3197
3198         if (!prepare_for_handlers(rx, hdr))
3199                 return false;
3200
3201         if (!consume) {
3202                 skb = skb_copy(skb, GFP_ATOMIC);
3203                 if (!skb) {
3204                         if (net_ratelimit())
3205                                 wiphy_debug(local->hw.wiphy,
3206                                         "failed to copy skb for %s\n",
3207                                         sdata->name);
3208                         return true;
3209                 }
3210
3211                 rx->skb = skb;
3212         }
3213
3214         ieee80211_invoke_rx_handlers(rx);
3215         return true;
3216 }
3217
3218 /*
3219  * This is the actual Rx frames handler. as it blongs to Rx path it must
3220  * be called with rcu_read_lock protection.
3221  */
3222 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3223                                          struct sk_buff *skb)
3224 {
3225         struct ieee80211_local *local = hw_to_local(hw);
3226         struct ieee80211_sub_if_data *sdata;
3227         struct ieee80211_hdr *hdr;
3228         __le16 fc;
3229         struct ieee80211_rx_data rx;
3230         struct ieee80211_sub_if_data *prev;
3231         struct sta_info *sta, *tmp, *prev_sta;
3232         int err = 0;
3233
3234         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3235         memset(&rx, 0, sizeof(rx));
3236         rx.skb = skb;
3237         rx.local = local;
3238
3239         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3240                 local->dot11ReceivedFragmentCount++;
3241
3242         if (ieee80211_is_mgmt(fc)) {
3243                 /* drop frame if too short for header */
3244                 if (skb->len < ieee80211_hdrlen(fc))
3245                         err = -ENOBUFS;
3246                 else
3247                         err = skb_linearize(skb);
3248         } else {
3249                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3250         }
3251
3252         if (err) {
3253                 dev_kfree_skb(skb);
3254                 return;
3255         }
3256
3257         hdr = (struct ieee80211_hdr *)skb->data;
3258         ieee80211_parse_qos(&rx);
3259         ieee80211_verify_alignment(&rx);
3260
3261         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3262                      ieee80211_is_beacon(hdr->frame_control)))
3263                 ieee80211_scan_rx(local, skb);
3264
3265         if (ieee80211_is_data(fc)) {
3266                 prev_sta = NULL;
3267
3268                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3269                         if (!prev_sta) {
3270                                 prev_sta = sta;
3271                                 continue;
3272                         }
3273
3274                         rx.sta = prev_sta;
3275                         rx.sdata = prev_sta->sdata;
3276                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3277
3278                         prev_sta = sta;
3279                 }
3280
3281                 if (prev_sta) {
3282                         rx.sta = prev_sta;
3283                         rx.sdata = prev_sta->sdata;
3284
3285                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3286                                 return;
3287                         goto out;
3288                 }
3289         }
3290
3291         prev = NULL;
3292
3293         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3294                 if (!ieee80211_sdata_running(sdata))
3295                         continue;
3296
3297                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3298                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3299                         continue;
3300
3301                 /*
3302                  * frame is destined for this interface, but if it's
3303                  * not also for the previous one we handle that after
3304                  * the loop to avoid copying the SKB once too much
3305                  */
3306
3307                 if (!prev) {
3308                         prev = sdata;
3309                         continue;
3310                 }
3311
3312                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3313                 rx.sdata = prev;
3314                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3315
3316                 prev = sdata;
3317         }
3318
3319         if (prev) {
3320                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3321                 rx.sdata = prev;
3322
3323                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3324                         return;
3325         }
3326
3327  out:
3328         dev_kfree_skb(skb);
3329 }
3330
3331 /*
3332  * This is the receive path handler. It is called by a low level driver when an
3333  * 802.11 MPDU is received from the hardware.
3334  */
3335 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3336 {
3337         struct ieee80211_local *local = hw_to_local(hw);
3338         struct ieee80211_rate *rate = NULL;
3339         struct ieee80211_supported_band *sband;
3340         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3341
3342         WARN_ON_ONCE(softirq_count() == 0);
3343
3344         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3345                 goto drop;
3346
3347         sband = local->hw.wiphy->bands[status->band];
3348         if (WARN_ON(!sband))
3349                 goto drop;
3350
3351         /*
3352          * If we're suspending, it is possible although not too likely
3353          * that we'd be receiving frames after having already partially
3354          * quiesced the stack. We can't process such frames then since
3355          * that might, for example, cause stations to be added or other
3356          * driver callbacks be invoked.
3357          */
3358         if (unlikely(local->quiescing || local->suspended))
3359                 goto drop;
3360
3361         /* We might be during a HW reconfig, prevent Rx for the same reason */
3362         if (unlikely(local->in_reconfig))
3363                 goto drop;
3364
3365         /*
3366          * The same happens when we're not even started,
3367          * but that's worth a warning.
3368          */
3369         if (WARN_ON(!local->started))
3370                 goto drop;
3371
3372         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3373                 /*
3374                  * Validate the rate, unless a PLCP error means that
3375                  * we probably can't have a valid rate here anyway.
3376                  */
3377
3378                 if (status->flag & RX_FLAG_HT) {
3379                         /*
3380                          * rate_idx is MCS index, which can be [0-76]
3381                          * as documented on:
3382                          *
3383                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3384                          *
3385                          * Anything else would be some sort of driver or
3386                          * hardware error. The driver should catch hardware
3387                          * errors.
3388                          */
3389                         if (WARN(status->rate_idx > 76,
3390                                  "Rate marked as an HT rate but passed "
3391                                  "status->rate_idx is not "
3392                                  "an MCS index [0-76]: %d (0x%02x)\n",
3393                                  status->rate_idx,
3394                                  status->rate_idx))
3395                                 goto drop;
3396                 } else if (status->flag & RX_FLAG_VHT) {
3397                         if (WARN_ONCE(status->rate_idx > 9 ||
3398                                       !status->vht_nss ||
3399                                       status->vht_nss > 8,
3400                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3401                                       status->rate_idx, status->vht_nss))
3402                                 goto drop;
3403                 } else {
3404                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3405                                 goto drop;
3406                         rate = &sband->bitrates[status->rate_idx];
3407                 }
3408         }
3409
3410         status->rx_flags = 0;
3411
3412         /*
3413          * key references and virtual interfaces are protected using RCU
3414          * and this requires that we are in a read-side RCU section during
3415          * receive processing
3416          */
3417         rcu_read_lock();
3418
3419         /*
3420          * Frames with failed FCS/PLCP checksum are not returned,
3421          * all other frames are returned without radiotap header
3422          * if it was previously present.
3423          * Also, frames with less than 16 bytes are dropped.
3424          */
3425         skb = ieee80211_rx_monitor(local, skb, rate);
3426         if (!skb) {
3427                 rcu_read_unlock();
3428                 return;
3429         }
3430
3431         ieee80211_tpt_led_trig_rx(local,
3432                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3433                         skb->len);
3434         __ieee80211_rx_handle_packet(hw, skb);
3435
3436         rcu_read_unlock();
3437
3438         return;
3439  drop:
3440         kfree_skb(skb);
3441 }
3442 EXPORT_SYMBOL(ieee80211_rx);
3443
3444 /* This is a version of the rx handler that can be called from hard irq
3445  * context. Post the skb on the queue and schedule the tasklet */
3446 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3447 {
3448         struct ieee80211_local *local = hw_to_local(hw);
3449
3450         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3451
3452         skb->pkt_type = IEEE80211_RX_MSG;
3453         skb_queue_tail(&local->skb_queue, skb);
3454         tasklet_schedule(&local->tasklet);
3455 }
3456 EXPORT_SYMBOL(ieee80211_rx_irqsafe);