net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/jiffies.h>
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 /*
  36  * monitor mode reception
  37  *
  38  * This function cleans up the SKB, i.e. it removes all the stuff
  39  * only useful for monitoring.
  40  */
  41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  42                                            struct sk_buff *skb,
  43                                            unsigned int rtap_vendor_space)
  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         __pskb_pull(skb, rtap_vendor_space);
  57
  58         return skb;
  59 }
  60
  61 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  62                                      unsigned int rtap_vendor_space)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + rtap_vendor_space);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return true;
  73
  74         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
  75                 return true;
  76
  77         if (ieee80211_is_ctl(hdr->frame_control) &&
  78             !ieee80211_is_pspoll(hdr->frame_control) &&
  79             !ieee80211_is_back_req(hdr->frame_control))
  80                 return true;
  81
  82         return false;
  83 }
  84
  85 static int
  86 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
  87                              struct ieee80211_rx_status *status,
  88                              struct sk_buff *skb)
  89 {
  90         int len;
  91
  92         /* always present fields */
  93         len = sizeof(struct ieee80211_radiotap_header) + 8;
  94
  95         /* allocate extra bitmaps */
  96         if (status->chains)
  97                 len += 4 * hweight8(status->chains);
  98
  99         if (ieee80211_have_rx_timestamp(status)) {
 100                 len = ALIGN(len, 8);
 101                 len += 8;
 102         }
 103         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 104                 len += 1;
 105
 106         /* antenna field, if we don't have per-chain info */
 107         if (!status->chains)
 108                 len += 1;
 109
 110         /* padding for RX_FLAGS if necessary */
 111         len = ALIGN(len, 2);
 112
 113         if (status->flag & RX_FLAG_HT) /* HT info */
 114                 len += 3;
 115
 116         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 117                 len = ALIGN(len, 4);
 118                 len += 8;
 119         }
 120
 121         if (status->flag & RX_FLAG_VHT) {
 122                 len = ALIGN(len, 2);
 123                 len += 12;
 124         }
 125
 126         if (status->chains) {
 127                 /* antenna and antenna signal fields */
 128                 len += 2 * hweight8(status->chains);
 129         }
 130
 131         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 132                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 133
 134                 /* vendor presence bitmap */
 135                 len += 4;
 136                 /* alignment for fixed 6-byte vendor data header */
 137                 len = ALIGN(len, 2);
 138                 /* vendor data header */
 139                 len += 6;
 140                 if (WARN_ON(rtap->align == 0))
 141                         rtap->align = 1;
 142                 len = ALIGN(len, rtap->align);
 143                 len += rtap->len + rtap->pad;
 144         }
 145
 146         return len;
 147 }
 148
 149 /*
 150  * ieee80211_add_rx_radiotap_header - add radiotap header
 151  *
 152  * add a radiotap header containing all the fields which the hardware provided.
 153  */
 154 static void
 155 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 156                                  struct sk_buff *skb,
 157                                  struct ieee80211_rate *rate,
 158                                  int rtap_len, bool has_fcs)
 159 {
 160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 161         struct ieee80211_radiotap_header *rthdr;
 162         unsigned char *pos;
 163         __le32 *it_present;
 164         u32 it_present_val;
 165         u16 rx_flags = 0;
 166         u16 channel_flags = 0;
 167         int mpdulen, chain;
 168         unsigned long chains = status->chains;
 169         struct ieee80211_vendor_radiotap rtap = {};
 170
 171         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 172                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 173                 /* rtap.len and rtap.pad are undone immediately */
 174                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 175         }
 176
 177         mpdulen = skb->len;
 178         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 179                 mpdulen += FCS_LEN;
 180
 181         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 182         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 183         it_present = &rthdr->it_present;
 184
 185         /* radiotap header, set always present flags */
 186         rthdr->it_len = cpu_to_le16(rtap_len);
 187         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 188                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 189                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 190
 191         if (!status->chains)
 192                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 193
 194         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 195                 it_present_val |=
 196                         BIT(IEEE80211_RADIOTAP_EXT) |
 197                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 198                 put_unaligned_le32(it_present_val, it_present);
 199                 it_present++;
 200                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 201                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 202         }
 203
 204         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 205                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 206                                   BIT(IEEE80211_RADIOTAP_EXT);
 207                 put_unaligned_le32(it_present_val, it_present);
 208                 it_present++;
 209                 it_present_val = rtap.present;
 210         }
 211
 212         put_unaligned_le32(it_present_val, it_present);
 213
 214         pos = (void *)(it_present + 1);
 215
 216         /* the order of the following fields is important */
 217
 218         /* IEEE80211_RADIOTAP_TSFT */
 219         if (ieee80211_have_rx_timestamp(status)) {
 220                 /* padding */
 221                 while ((pos - (u8 *)rthdr) & 7)
 222                         *pos++ = 0;
 223                 put_unaligned_le64(
 224                         ieee80211_calculate_rx_timestamp(local, status,
 225                                                          mpdulen, 0),
 226                         pos);
 227                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 228                 pos += 8;
 229         }
 230
 231         /* IEEE80211_RADIOTAP_FLAGS */
 232         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 233                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 234         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 235                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 236         if (status->flag & RX_FLAG_SHORTPRE)
 237                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 238         pos++;
 239
 240         /* IEEE80211_RADIOTAP_RATE */
 241         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 242                 /*
 243                  * Without rate information don't add it. If we have,
 244                  * MCS information is a separate field in radiotap,
 245                  * added below. The byte here is needed as padding
 246                  * for the channel though, so initialise it to 0.
 247                  */
 248                 *pos = 0;
 249         } else {
 250                 int shift = 0;
 251                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 252                 if (status->flag & RX_FLAG_10MHZ)
 253                         shift = 1;
 254                 else if (status->flag & RX_FLAG_5MHZ)
 255                         shift = 2;
 256                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 257         }
 258         pos++;
 259
 260         /* IEEE80211_RADIOTAP_CHANNEL */
 261         put_unaligned_le16(status->freq, pos);
 262         pos += 2;
 263         if (status->flag & RX_FLAG_10MHZ)
 264                 channel_flags |= IEEE80211_CHAN_HALF;
 265         else if (status->flag & RX_FLAG_5MHZ)
 266                 channel_flags |= IEEE80211_CHAN_QUARTER;
 267
 268         if (status->band == IEEE80211_BAND_5GHZ)
 269                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 270         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 271                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 272         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 273                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 274         else if (rate)
 275                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 276         else
 277                 channel_flags |= IEEE80211_CHAN_2GHZ;
 278         put_unaligned_le16(channel_flags, pos);
 279         pos += 2;
 280
 281         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 282         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 283             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 284                 *pos = status->signal;
 285                 rthdr->it_present |=
 286                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 287                 pos++;
 288         }
 289
 290         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 291
 292         if (!status->chains) {
 293                 /* IEEE80211_RADIOTAP_ANTENNA */
 294                 *pos = status->antenna;
 295                 pos++;
 296         }
 297
 298         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 299
 300         /* IEEE80211_RADIOTAP_RX_FLAGS */
 301         /* ensure 2 byte alignment for the 2 byte field as required */
 302         if ((pos - (u8 *)rthdr) & 1)
 303                 *pos++ = 0;
 304         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 305                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 306         put_unaligned_le16(rx_flags, pos);
 307         pos += 2;
 308
 309         if (status->flag & RX_FLAG_HT) {
 310                 unsigned int stbc;
 311
 312                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 313                 *pos++ = local->hw.radiotap_mcs_details;
 314                 *pos = 0;
 315                 if (status->flag & RX_FLAG_SHORT_GI)
 316                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 317                 if (status->flag & RX_FLAG_40MHZ)
 318                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 319                 if (status->flag & RX_FLAG_HT_GF)
 320                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 321                 if (status->flag & RX_FLAG_LDPC)
 322                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 323                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 324                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 325                 pos++;
 326                 *pos++ = status->rate_idx;
 327         }
 328
 329         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 330                 u16 flags = 0;
 331
 332                 /* ensure 4 byte alignment */
 333                 while ((pos - (u8 *)rthdr) & 3)
 334                         pos++;
 335                 rthdr->it_present |=
 336                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 337                 put_unaligned_le32(status->ampdu_reference, pos);
 338                 pos += 4;
 339                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 340                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 341                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 342                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 343                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 344                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 345                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 346                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 347                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 348                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 349                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 350                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 351                 put_unaligned_le16(flags, pos);
 352                 pos += 2;
 353                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 354                         *pos++ = status->ampdu_delimiter_crc;
 355                 else
 356                         *pos++ = 0;
 357                 *pos++ = 0;
 358         }
 359
 360         if (status->flag & RX_FLAG_VHT) {
 361                 u16 known = local->hw.radiotap_vht_details;
 362
 363                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 364                 put_unaligned_le16(known, pos);
 365                 pos += 2;
 366                 /* flags */
 367                 if (status->flag & RX_FLAG_SHORT_GI)
 368                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 369                 /* in VHT, STBC is binary */
 370                 if (status->flag & RX_FLAG_STBC_MASK)
 371                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 372                 if (status->vht_flag & RX_VHT_FLAG_BF)
 373                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 374                 pos++;
 375                 /* bandwidth */
 376                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 377                         *pos++ = 4;
 378                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 379                         *pos++ = 11;
 380                 else if (status->flag & RX_FLAG_40MHZ)
 381                         *pos++ = 1;
 382                 else /* 20 MHz */
 383                         *pos++ = 0;
 384                 /* MCS/NSS */
 385                 *pos = (status->rate_idx << 4) | status->vht_nss;
 386                 pos += 4;
 387                 /* coding field */
 388                 if (status->flag & RX_FLAG_LDPC)
 389                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 390                 pos++;
 391                 /* group ID */
 392                 pos++;
 393                 /* partial_aid */
 394                 pos += 2;
 395         }
 396
 397         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 398                 *pos++ = status->chain_signal[chain];
 399                 *pos++ = chain;
 400         }
 401
 402         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 403                 /* ensure 2 byte alignment for the vendor field as required */
 404                 if ((pos - (u8 *)rthdr) & 1)
 405                         *pos++ = 0;
 406                 *pos++ = rtap.oui[0];
 407                 *pos++ = rtap.oui[1];
 408                 *pos++ = rtap.oui[2];
 409                 *pos++ = rtap.subns;
 410                 put_unaligned_le16(rtap.len, pos);
 411                 pos += 2;
 412                 /* align the actual payload as requested */
 413                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 414                         *pos++ = 0;
 415                 /* data (and possible padding) already follows */
 416         }
 417 }
 418
 419 /*
 420  * This function copies a received frame to all monitor interfaces and
 421  * returns a cleaned-up SKB that no longer includes the FCS nor the
 422  * radiotap header the driver might have added.
 423  */
 424 static struct sk_buff *
 425 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 426                      struct ieee80211_rate *rate)
 427 {
 428         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 429         struct ieee80211_sub_if_data *sdata;
 430         int rt_hdrlen, needed_headroom;
 431         struct sk_buff *skb, *skb2;
 432         struct net_device *prev_dev = NULL;
 433         int present_fcs_len = 0;
 434         unsigned int rtap_vendor_space = 0;
 435
 436         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 437                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 438
 439                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 440         }
 441
 442         /*
 443          * First, we may need to make a copy of the skb because
 444          *  (1) we need to modify it for radiotap (if not present), and
 445          *  (2) the other RX handlers will modify the skb we got.
 446          *
 447          * We don't need to, of course, if we aren't going to return
 448          * the SKB because it has a bad FCS/PLCP checksum.
 449          */
 450
 451         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 452                 present_fcs_len = FCS_LEN;
 453
 454         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 455         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 456                 dev_kfree_skb(origskb);
 457                 return NULL;
 458         }
 459
 460         if (!local->monitors) {
 461                 if (should_drop_frame(origskb, present_fcs_len,
 462                                       rtap_vendor_space)) {
 463                         dev_kfree_skb(origskb);
 464                         return NULL;
 465                 }
 466
 467                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 468         }
 469
 470         /* room for the radiotap header based on driver features */
 471         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 472         needed_headroom = rt_hdrlen - rtap_vendor_space;
 473
 474         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 475                 /* only need to expand headroom if necessary */
 476                 skb = origskb;
 477                 origskb = NULL;
 478
 479                 /*
 480                  * This shouldn't trigger often because most devices have an
 481                  * RX header they pull before we get here, and that should
 482                  * be big enough for our radiotap information. We should
 483                  * probably export the length to drivers so that we can have
 484                  * them allocate enough headroom to start with.
 485                  */
 486                 if (skb_headroom(skb) < needed_headroom &&
 487                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 488                         dev_kfree_skb(skb);
 489                         return NULL;
 490                 }
 491         } else {
 492                 /*
 493                  * Need to make a copy and possibly remove radiotap header
 494                  * and FCS from the original.
 495                  */
 496                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 497
 498                 origskb = remove_monitor_info(local, origskb,
 499                                               rtap_vendor_space);
 500
 501                 if (!skb)
 502                         return origskb;
 503         }
 504
 505         /* prepend radiotap information */
 506         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 507
 508         skb_reset_mac_header(skb);
 509         skb->ip_summed = CHECKSUM_UNNECESSARY;
 510         skb->pkt_type = PACKET_OTHERHOST;
 511         skb->protocol = htons(ETH_P_802_2);
 512
 513         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 514                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 515                         continue;
 516
 517                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 518                         continue;
 519
 520                 if (!ieee80211_sdata_running(sdata))
 521                         continue;
 522
 523                 if (prev_dev) {
 524                         skb2 = skb_clone(skb, GFP_ATOMIC);
 525                         if (skb2) {
 526                                 skb2->dev = prev_dev;
 527                                 netif_receive_skb(skb2);
 528                         }
 529                 }
 530
 531                 prev_dev = sdata->dev;
 532                 sdata->dev->stats.rx_packets++;
 533                 sdata->dev->stats.rx_bytes += skb->len;
 534         }
 535
 536         if (prev_dev) {
 537                 skb->dev = prev_dev;
 538                 netif_receive_skb(skb);
 539         } else
 540                 dev_kfree_skb(skb);
 541
 542         return origskb;
 543 }
 544
 545 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 546 {
 547         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 548         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 549         int tid, seqno_idx, security_idx;
 550
 551         /* does the frame have a qos control field? */
 552         if (ieee80211_is_data_qos(hdr->frame_control)) {
 553                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 554                 /* frame has qos control */
 555                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 556                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 557                         status->rx_flags |= IEEE80211_RX_AMSDU;
 558
 559                 seqno_idx = tid;
 560                 security_idx = tid;
 561         } else {
 562                 /*
 563                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 564                  *
 565                  *      Sequence numbers for management frames, QoS data
 566                  *      frames with a broadcast/multicast address in the
 567                  *      Address 1 field, and all non-QoS data frames sent
 568                  *      by QoS STAs are assigned using an additional single
 569                  *      modulo-4096 counter, [...]
 570                  *
 571                  * We also use that counter for non-QoS STAs.
 572                  */
 573                 seqno_idx = IEEE80211_NUM_TIDS;
 574                 security_idx = 0;
 575                 if (ieee80211_is_mgmt(hdr->frame_control))
 576                         security_idx = IEEE80211_NUM_TIDS;
 577                 tid = 0;
 578         }
 579
 580         rx->seqno_idx = seqno_idx;
 581         rx->security_idx = security_idx;
 582         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 583          * For now, set skb->priority to 0 for other cases. */
 584         rx->skb->priority = (tid > 7) ? 0 : tid;
 585 }
 586
 587 /**
 588  * DOC: Packet alignment
 589  *
 590  * Drivers always need to pass packets that are aligned to two-byte boundaries
 591  * to the stack.
 592  *
 593  * Additionally, should, if possible, align the payload data in a way that
 594  * guarantees that the contained IP header is aligned to a four-byte
 595  * boundary. In the case of regular frames, this simply means aligning the
 596  * payload to a four-byte boundary (because either the IP header is directly
 597  * contained, or IV/RFC1042 headers that have a length divisible by four are
 598  * in front of it).  If the payload data is not properly aligned and the
 599  * architecture doesn't support efficient unaligned operations, mac80211
 600  * will align the data.
 601  *
 602  * With A-MSDU frames, however, the payload data address must yield two modulo
 603  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 604  * push the IP header further back to a multiple of four again. Thankfully, the
 605  * specs were sane enough this time around to require padding each A-MSDU
 606  * subframe to a length that is a multiple of four.
 607  *
 608  * Padding like Atheros hardware adds which is between the 802.11 header and
 609  * the payload is not supported, the driver is required to move the 802.11
 610  * header to be directly in front of the payload in that case.
 611  */
 612 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 613 {
 614 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 615         WARN_ONCE((unsigned long)rx->skb->data & 1,
 616                   "unaligned packet at 0x%p\n", rx->skb->data);
 617 #endif
 618 }
 619
 620
 621 /* rx handlers */
 622
 623 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 624 {
 625         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 626
 627         if (is_multicast_ether_addr(hdr->addr1))
 628                 return 0;
 629
 630         return ieee80211_is_robust_mgmt_frame(skb);
 631 }
 632
 633
 634 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 635 {
 636         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 637
 638         if (!is_multicast_ether_addr(hdr->addr1))
 639                 return 0;
 640
 641         return ieee80211_is_robust_mgmt_frame(skb);
 642 }
 643
 644
 645 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 646 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 647 {
 648         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 649         struct ieee80211_mmie *mmie;
 650         struct ieee80211_mmie_16 *mmie16;
 651
 652         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 653                 return -1;
 654
 655         if (!ieee80211_is_robust_mgmt_frame(skb))
 656                 return -1; /* not a robust management frame */
 657
 658         mmie = (struct ieee80211_mmie *)
 659                 (skb->data + skb->len - sizeof(*mmie));
 660         if (mmie->element_id == WLAN_EID_MMIE &&
 661             mmie->length == sizeof(*mmie) - 2)
 662                 return le16_to_cpu(mmie->key_id);
 663
 664         mmie16 = (struct ieee80211_mmie_16 *)
 665                 (skb->data + skb->len - sizeof(*mmie16));
 666         if (skb->len >= 24 + sizeof(*mmie16) &&
 667             mmie16->element_id == WLAN_EID_MMIE &&
 668             mmie16->length == sizeof(*mmie16) - 2)
 669                 return le16_to_cpu(mmie16->key_id);
 670
 671         return -1;
 672 }
 673
 674 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 675                                  struct sk_buff *skb)
 676 {
 677         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 678         __le16 fc;
 679         int hdrlen;
 680         u8 keyid;
 681
 682         fc = hdr->frame_control;
 683         hdrlen = ieee80211_hdrlen(fc);
 684
 685         if (skb->len < hdrlen + cs->hdr_len)
 686                 return -EINVAL;
 687
 688         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 689         keyid &= cs->key_idx_mask;
 690         keyid >>= cs->key_idx_shift;
 691
 692         return keyid;
 693 }
 694
 695 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 696 {
 697         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 698         char *dev_addr = rx->sdata->vif.addr;
 699
 700         if (ieee80211_is_data(hdr->frame_control)) {
 701                 if (is_multicast_ether_addr(hdr->addr1)) {
 702                         if (ieee80211_has_tods(hdr->frame_control) ||
 703                             !ieee80211_has_fromds(hdr->frame_control))
 704                                 return RX_DROP_MONITOR;
 705                         if (ether_addr_equal(hdr->addr3, dev_addr))
 706                                 return RX_DROP_MONITOR;
 707                 } else {
 708                         if (!ieee80211_has_a4(hdr->frame_control))
 709                                 return RX_DROP_MONITOR;
 710                         if (ether_addr_equal(hdr->addr4, dev_addr))
 711                                 return RX_DROP_MONITOR;
 712                 }
 713         }
 714
 715         /* If there is not an established peer link and this is not a peer link
 716          * establisment frame, beacon or probe, drop the frame.
 717          */
 718
 719         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 720                 struct ieee80211_mgmt *mgmt;
 721
 722                 if (!ieee80211_is_mgmt(hdr->frame_control))
 723                         return RX_DROP_MONITOR;
 724
 725                 if (ieee80211_is_action(hdr->frame_control)) {
 726                         u8 category;
 727
 728                         /* make sure category field is present */
 729                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 730                                 return RX_DROP_MONITOR;
 731
 732                         mgmt = (struct ieee80211_mgmt *)hdr;
 733                         category = mgmt->u.action.category;
 734                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 735                             category != WLAN_CATEGORY_SELF_PROTECTED)
 736                                 return RX_DROP_MONITOR;
 737                         return RX_CONTINUE;
 738                 }
 739
 740                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 741                     ieee80211_is_probe_resp(hdr->frame_control) ||
 742                     ieee80211_is_beacon(hdr->frame_control) ||
 743                     ieee80211_is_auth(hdr->frame_control))
 744                         return RX_CONTINUE;
 745
 746                 return RX_DROP_MONITOR;
 747         }
 748
 749         return RX_CONTINUE;
 750 }
 751
 752 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 753                                             struct tid_ampdu_rx *tid_agg_rx,
 754                                             int index,
 755                                             struct sk_buff_head *frames)
 756 {
 757         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 758         struct sk_buff *skb;
 759         struct ieee80211_rx_status *status;
 760
 761         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 762
 763         if (skb_queue_empty(skb_list))
 764                 goto no_frame;
 765
 766         if (!ieee80211_rx_reorder_ready(skb_list)) {
 767                 __skb_queue_purge(skb_list);
 768                 goto no_frame;
 769         }
 770
 771         /* release frames from the reorder ring buffer */
 772         tid_agg_rx->stored_mpdu_num--;
 773         while ((skb = __skb_dequeue(skb_list))) {
 774                 status = IEEE80211_SKB_RXCB(skb);
 775                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 776                 __skb_queue_tail(frames, skb);
 777         }
 778
 779 no_frame:
 780         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 781 }
 782
 783 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 784                                              struct tid_ampdu_rx *tid_agg_rx,
 785                                              u16 head_seq_num,
 786                                              struct sk_buff_head *frames)
 787 {
 788         int index;
 789
 790         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 791
 792         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 793                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796         }
 797 }
 798
 799 /*
 800  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 801  * the skb was added to the buffer longer than this time ago, the earlier
 802  * frames that have not yet been received are assumed to be lost and the skb
 803  * can be released for processing. This may also release other skb's from the
 804  * reorder buffer if there are no additional gaps between the frames.
 805  *
 806  * Callers must hold tid_agg_rx->reorder_lock.
 807  */
 808 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 809
 810 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 811                                           struct tid_ampdu_rx *tid_agg_rx,
 812                                           struct sk_buff_head *frames)
 813 {
 814         int index, i, j;
 815
 816         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 817
 818         /* release the buffer until next missing frame */
 819         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 820         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 821             tid_agg_rx->stored_mpdu_num) {
 822                 /*
 823                  * No buffers ready to be released, but check whether any
 824                  * frames in the reorder buffer have timed out.
 825                  */
 826                 int skipped = 1;
 827                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 828                      j = (j + 1) % tid_agg_rx->buf_size) {
 829                         if (!ieee80211_rx_reorder_ready(
 830                                         &tid_agg_rx->reorder_buf[j])) {
 831                                 skipped++;
 832                                 continue;
 833                         }
 834                         if (skipped &&
 835                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 836                                         HT_RX_REORDER_BUF_TIMEOUT))
 837                                 goto set_release_timer;
 838
 839                         /* don't leave incomplete A-MSDUs around */
 840                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 841                              i = (i + 1) % tid_agg_rx->buf_size)
 842                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 843
 844                         ht_dbg_ratelimited(sdata,
 845                                            "release an RX reorder frame due to timeout on earlier frames\n");
 846                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 847                                                         frames);
 848
 849                         /*
 850                          * Increment the head seq# also for the skipped slots.
 851                          */
 852                         tid_agg_rx->head_seq_num =
 853                                 (tid_agg_rx->head_seq_num +
 854                                  skipped) & IEEE80211_SN_MASK;
 855                         skipped = 0;
 856                 }
 857         } else while (ieee80211_rx_reorder_ready(
 858                                 &tid_agg_rx->reorder_buf[index])) {
 859                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 860                                                 frames);
 861                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 862         }
 863
 864         if (tid_agg_rx->stored_mpdu_num) {
 865                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 866
 867                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 868                      j = (j + 1) % tid_agg_rx->buf_size) {
 869                         if (ieee80211_rx_reorder_ready(
 870                                         &tid_agg_rx->reorder_buf[j]))
 871                                 break;
 872                 }
 873
 874  set_release_timer:
 875
 876                 mod_timer(&tid_agg_rx->reorder_timer,
 877                           tid_agg_rx->reorder_time[j] + 1 +
 878                           HT_RX_REORDER_BUF_TIMEOUT);
 879         } else {
 880                 del_timer(&tid_agg_rx->reorder_timer);
 881         }
 882 }
 883
 884 /*
 885  * As this function belongs to the RX path it must be under
 886  * rcu_read_lock protection. It returns false if the frame
 887  * can be processed immediately, true if it was consumed.
 888  */
 889 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 890                                              struct tid_ampdu_rx *tid_agg_rx,
 891                                              struct sk_buff *skb,
 892                                              struct sk_buff_head *frames)
 893 {
 894         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 895         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 896         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 897         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 898         u16 head_seq_num, buf_size;
 899         int index;
 900         bool ret = true;
 901
 902         spin_lock(&tid_agg_rx->reorder_lock);
 903
 904         /*
 905          * Offloaded BA sessions have no known starting sequence number so pick
 906          * one from first Rxed frame for this tid after BA was started.
 907          */
 908         if (unlikely(tid_agg_rx->auto_seq)) {
 909                 tid_agg_rx->auto_seq = false;
 910                 tid_agg_rx->ssn = mpdu_seq_num;
 911                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 912         }
 913
 914         buf_size = tid_agg_rx->buf_size;
 915         head_seq_num = tid_agg_rx->head_seq_num;
 916
 917         /* frame with out of date sequence number */
 918         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 919                 dev_kfree_skb(skb);
 920                 goto out;
 921         }
 922
 923         /*
 924          * If frame the sequence number exceeds our buffering window
 925          * size release some previous frames to make room for this one.
 926          */
 927         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 928                 head_seq_num = ieee80211_sn_inc(
 929                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 930                 /* release stored frames up to new head to stack */
 931                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 932                                                  head_seq_num, frames);
 933         }
 934
 935         /* Now the new frame is always in the range of the reordering buffer */
 936
 937         index = mpdu_seq_num % tid_agg_rx->buf_size;
 938
 939         /* check if we already stored this frame */
 940         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 941                 dev_kfree_skb(skb);
 942                 goto out;
 943         }
 944
 945         /*
 946          * If the current MPDU is in the right order and nothing else
 947          * is stored we can process it directly, no need to buffer it.
 948          * If it is first but there's something stored, we may be able
 949          * to release frames after this one.
 950          */
 951         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 952             tid_agg_rx->stored_mpdu_num == 0) {
 953                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
 954                         tid_agg_rx->head_seq_num =
 955                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 956                 ret = false;
 957                 goto out;
 958         }
 959
 960         /* put the frame in the reordering buffer */
 961         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
 962         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 963                 tid_agg_rx->reorder_time[index] = jiffies;
 964                 tid_agg_rx->stored_mpdu_num++;
 965                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 966         }
 967
 968  out:
 969         spin_unlock(&tid_agg_rx->reorder_lock);
 970         return ret;
 971 }
 972
 973 /*
 974  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 975  * true if the MPDU was buffered, false if it should be processed.
 976  */
 977 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 978                                        struct sk_buff_head *frames)
 979 {
 980         struct sk_buff *skb = rx->skb;
 981         struct ieee80211_local *local = rx->local;
 982         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 983         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 984         struct sta_info *sta = rx->sta;
 985         struct tid_ampdu_rx *tid_agg_rx;
 986         u16 sc;
 987         u8 tid, ack_policy;
 988
 989         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 990             is_multicast_ether_addr(hdr->addr1))
 991                 goto dont_reorder;
 992
 993         /*
 994          * filter the QoS data rx stream according to
 995          * STA/TID and check if this STA/TID is on aggregation
 996          */
 997
 998         if (!sta)
 999                 goto dont_reorder;
1000
1001         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1002                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1003         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1004
1005         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1006         if (!tid_agg_rx)
1007                 goto dont_reorder;
1008
1009         /* qos null data frames are excluded */
1010         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1011                 goto dont_reorder;
1012
1013         /* not part of a BA session */
1014         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1015             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1016                 goto dont_reorder;
1017
1018         /* not actually part of this BA session */
1019         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1020                 goto dont_reorder;
1021
1022         /* new, potentially un-ordered, ampdu frame - process it */
1023
1024         /* reset session timer */
1025         if (tid_agg_rx->timeout)
1026                 tid_agg_rx->last_rx = jiffies;
1027
1028         /* if this mpdu is fragmented - terminate rx aggregation session */
1029         sc = le16_to_cpu(hdr->seq_ctrl);
1030         if (sc & IEEE80211_SCTL_FRAG) {
1031                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1032                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1033                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1034                 return;
1035         }
1036
1037         /*
1038          * No locking needed -- we will only ever process one
1039          * RX packet at a time, and thus own tid_agg_rx. All
1040          * other code manipulating it needs to (and does) make
1041          * sure that we cannot get to it any more before doing
1042          * anything with it.
1043          */
1044         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1045                                              frames))
1046                 return;
1047
1048  dont_reorder:
1049         __skb_queue_tail(frames, skb);
1050 }
1051
1052 static ieee80211_rx_result debug_noinline
1053 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1054 {
1055         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1056         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1057
1058         /*
1059          * Drop duplicate 802.11 retransmissions
1060          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1061          */
1062
1063         if (rx->skb->len < 24)
1064                 return RX_CONTINUE;
1065
1066         if (ieee80211_is_ctl(hdr->frame_control) ||
1067             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1068             is_multicast_ether_addr(hdr->addr1))
1069                 return RX_CONTINUE;
1070
1071         if (rx->sta) {
1072                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1073                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1074                              hdr->seq_ctrl)) {
1075                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1076                                 rx->local->dot11FrameDuplicateCount++;
1077                                 rx->sta->num_duplicates++;
1078                         }
1079                         return RX_DROP_UNUSABLE;
1080                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1081                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1082                 }
1083         }
1084
1085         return RX_CONTINUE;
1086 }
1087
1088 static ieee80211_rx_result debug_noinline
1089 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1090 {
1091         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1092
1093         if (unlikely(rx->skb->len < 16)) {
1094                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1095                 return RX_DROP_MONITOR;
1096         }
1097
1098         /* Drop disallowed frame classes based on STA auth/assoc state;
1099          * IEEE 802.11, Chap 5.5.
1100          *
1101          * mac80211 filters only based on association state, i.e. it drops
1102          * Class 3 frames from not associated stations. hostapd sends
1103          * deauth/disassoc frames when needed. In addition, hostapd is
1104          * responsible for filtering on both auth and assoc states.
1105          */
1106
1107         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1108                 return ieee80211_rx_mesh_check(rx);
1109
1110         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1111                       ieee80211_is_pspoll(hdr->frame_control)) &&
1112                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1113                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1114                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1115                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1116                 /*
1117                  * accept port control frames from the AP even when it's not
1118                  * yet marked ASSOC to prevent a race where we don't set the
1119                  * assoc bit quickly enough before it sends the first frame
1120                  */
1121                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1122                     ieee80211_is_data_present(hdr->frame_control)) {
1123                         unsigned int hdrlen;
1124                         __be16 ethertype;
1125
1126                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1127
1128                         if (rx->skb->len < hdrlen + 8)
1129                                 return RX_DROP_MONITOR;
1130
1131                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1132                         if (ethertype == rx->sdata->control_port_protocol)
1133                                 return RX_CONTINUE;
1134                 }
1135
1136                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1137                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1138                                                hdr->addr2,
1139                                                GFP_ATOMIC))
1140                         return RX_DROP_UNUSABLE;
1141
1142                 return RX_DROP_MONITOR;
1143         }
1144
1145         return RX_CONTINUE;
1146 }
1147
1148
1149 static ieee80211_rx_result debug_noinline
1150 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1151 {
1152         struct ieee80211_local *local;
1153         struct ieee80211_hdr *hdr;
1154         struct sk_buff *skb;
1155
1156         local = rx->local;
1157         skb = rx->skb;
1158         hdr = (struct ieee80211_hdr *) skb->data;
1159
1160         if (!local->pspolling)
1161                 return RX_CONTINUE;
1162
1163         if (!ieee80211_has_fromds(hdr->frame_control))
1164                 /* this is not from AP */
1165                 return RX_CONTINUE;
1166
1167         if (!ieee80211_is_data(hdr->frame_control))
1168                 return RX_CONTINUE;
1169
1170         if (!ieee80211_has_moredata(hdr->frame_control)) {
1171                 /* AP has no more frames buffered for us */
1172                 local->pspolling = false;
1173                 return RX_CONTINUE;
1174         }
1175
1176         /* more data bit is set, let's request a new frame from the AP */
1177         ieee80211_send_pspoll(local, rx->sdata);
1178
1179         return RX_CONTINUE;
1180 }
1181
1182 static void sta_ps_start(struct sta_info *sta)
1183 {
1184         struct ieee80211_sub_if_data *sdata = sta->sdata;
1185         struct ieee80211_local *local = sdata->local;
1186         struct ps_data *ps;
1187         int tid;
1188
1189         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1190             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1191                 ps = &sdata->bss->ps;
1192         else
1193                 return;
1194
1195         atomic_inc(&ps->num_sta_ps);
1196         set_sta_flag(sta, WLAN_STA_PS_STA);
1197         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1198                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1199         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1200                sta->sta.addr, sta->sta.aid);
1201
1202         if (!sta->sta.txq[0])
1203                 return;
1204
1205         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1206                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1207
1208                 if (!skb_queue_len(&txqi->queue))
1209                         set_bit(tid, &sta->txq_buffered_tids);
1210                 else
1211                         clear_bit(tid, &sta->txq_buffered_tids);
1212         }
1213 }
1214
1215 static void sta_ps_end(struct sta_info *sta)
1216 {
1217         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1218                sta->sta.addr, sta->sta.aid);
1219
1220         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1221                 /*
1222                  * Clear the flag only if the other one is still set
1223                  * so that the TX path won't start TX'ing new frames
1224                  * directly ... In the case that the driver flag isn't
1225                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1226                  */
1227                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1228                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1229                        sta->sta.addr, sta->sta.aid);
1230                 return;
1231         }
1232
1233         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1234         clear_sta_flag(sta, WLAN_STA_PS_STA);
1235         ieee80211_sta_ps_deliver_wakeup(sta);
1236 }
1237
1238 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1239 {
1240         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1241         bool in_ps;
1242
1243         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1244
1245         /* Don't let the same PS state be set twice */
1246         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1247         if ((start && in_ps) || (!start && !in_ps))
1248                 return -EINVAL;
1249
1250         if (start)
1251                 sta_ps_start(sta_inf);
1252         else
1253                 sta_ps_end(sta_inf);
1254
1255         return 0;
1256 }
1257 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1258
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1261 {
1262         struct ieee80211_sub_if_data *sdata = rx->sdata;
1263         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1264         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1265         int tid, ac;
1266
1267         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1268                 return RX_CONTINUE;
1269
1270         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1271             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1272                 return RX_CONTINUE;
1273
1274         /*
1275          * The device handles station powersave, so don't do anything about
1276          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1277          * it to mac80211 since they're handled.)
1278          */
1279         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1280                 return RX_CONTINUE;
1281
1282         /*
1283          * Don't do anything if the station isn't already asleep. In
1284          * the uAPSD case, the station will probably be marked asleep,
1285          * in the PS-Poll case the station must be confused ...
1286          */
1287         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1288                 return RX_CONTINUE;
1289
1290         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1291                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1292                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1293                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1294                         else
1295                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1296                 }
1297
1298                 /* Free PS Poll skb here instead of returning RX_DROP that would
1299                  * count as an dropped frame. */
1300                 dev_kfree_skb(rx->skb);
1301
1302                 return RX_QUEUED;
1303         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1304                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1305                    ieee80211_has_pm(hdr->frame_control) &&
1306                    (ieee80211_is_data_qos(hdr->frame_control) ||
1307                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1308                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1309                 ac = ieee802_1d_to_ac[tid & 7];
1310
1311                 /*
1312                  * If this AC is not trigger-enabled do nothing.
1313                  *
1314                  * NB: This could/should check a separate bitmap of trigger-
1315                  * enabled queues, but for now we only implement uAPSD w/o
1316                  * TSPEC changes to the ACs, so they're always the same.
1317                  */
1318                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1319                         return RX_CONTINUE;
1320
1321                 /* if we are in a service period, do nothing */
1322                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1323                         return RX_CONTINUE;
1324
1325                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1326                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1327                 else
1328                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1329         }
1330
1331         return RX_CONTINUE;
1332 }
1333
1334 static ieee80211_rx_result debug_noinline
1335 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1336 {
1337         struct sta_info *sta = rx->sta;
1338         struct sk_buff *skb = rx->skb;
1339         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1340         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1341         int i;
1342
1343         if (!sta)
1344                 return RX_CONTINUE;
1345
1346         /*
1347          * Update last_rx only for IBSS packets which are for the current
1348          * BSSID and for station already AUTHORIZED to avoid keeping the
1349          * current IBSS network alive in cases where other STAs start
1350          * using different BSSID. This will also give the station another
1351          * chance to restart the authentication/authorization in case
1352          * something went wrong the first time.
1353          */
1354         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1355                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1356                                                 NL80211_IFTYPE_ADHOC);
1357                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1358                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1359                         sta->last_rx = jiffies;
1360                         if (ieee80211_is_data(hdr->frame_control) &&
1361                             !is_multicast_ether_addr(hdr->addr1)) {
1362                                 sta->last_rx_rate_idx = status->rate_idx;
1363                                 sta->last_rx_rate_flag = status->flag;
1364                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1365                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1366                         }
1367                 }
1368         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1369                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1370                                                 NL80211_IFTYPE_OCB);
1371                 /* OCB uses wild-card BSSID */
1372                 if (is_broadcast_ether_addr(bssid))
1373                         sta->last_rx = jiffies;
1374         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1375                 /*
1376                  * Mesh beacons will update last_rx when if they are found to
1377                  * match the current local configuration when processed.
1378                  */
1379                 sta->last_rx = jiffies;
1380                 if (ieee80211_is_data(hdr->frame_control)) {
1381                         sta->last_rx_rate_idx = status->rate_idx;
1382                         sta->last_rx_rate_flag = status->flag;
1383                         sta->last_rx_rate_vht_flag = status->vht_flag;
1384                         sta->last_rx_rate_vht_nss = status->vht_nss;
1385                 }
1386         }
1387
1388         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1389                 return RX_CONTINUE;
1390
1391         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1392                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1393
1394         sta->rx_fragments++;
1395         sta->rx_bytes += rx->skb->len;
1396         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1397                 sta->last_signal = status->signal;
1398                 ewma_add(&sta->avg_signal, -status->signal);
1399         }
1400
1401         if (status->chains) {
1402                 sta->chains = status->chains;
1403                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1404                         int signal = status->chain_signal[i];
1405
1406                         if (!(status->chains & BIT(i)))
1407                                 continue;
1408
1409                         sta->chain_signal_last[i] = signal;
1410                         ewma_add(&sta->chain_signal_avg[i], -signal);
1411                 }
1412         }
1413
1414         /*
1415          * Change STA power saving mode only at the end of a frame
1416          * exchange sequence.
1417          */
1418         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1419             !ieee80211_has_morefrags(hdr->frame_control) &&
1420             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1421             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1422              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1423             /* PM bit is only checked in frames where it isn't reserved,
1424              * in AP mode it's reserved in non-bufferable management frames
1425              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1426              */
1427             (!ieee80211_is_mgmt(hdr->frame_control) ||
1428              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1429                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1430                         if (!ieee80211_has_pm(hdr->frame_control))
1431                                 sta_ps_end(sta);
1432                 } else {
1433                         if (ieee80211_has_pm(hdr->frame_control))
1434                                 sta_ps_start(sta);
1435                 }
1436         }
1437
1438         /* mesh power save support */
1439         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1440                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1441
1442         /*
1443          * Drop (qos-)data::nullfunc frames silently, since they
1444          * are used only to control station power saving mode.
1445          */
1446         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1447             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1448                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1449
1450                 /*
1451                  * If we receive a 4-addr nullfunc frame from a STA
1452                  * that was not moved to a 4-addr STA vlan yet send
1453                  * the event to userspace and for older hostapd drop
1454                  * the frame to the monitor interface.
1455                  */
1456                 if (ieee80211_has_a4(hdr->frame_control) &&
1457                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1458                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1459                       !rx->sdata->u.vlan.sta))) {
1460                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1461                                 cfg80211_rx_unexpected_4addr_frame(
1462                                         rx->sdata->dev, sta->sta.addr,
1463                                         GFP_ATOMIC);
1464                         return RX_DROP_MONITOR;
1465                 }
1466                 /*
1467                  * Update counter and free packet here to avoid
1468                  * counting this as a dropped packed.
1469                  */
1470                 sta->rx_packets++;
1471                 dev_kfree_skb(rx->skb);
1472                 return RX_QUEUED;
1473         }
1474
1475         return RX_CONTINUE;
1476 } /* ieee80211_rx_h_sta_process */
1477
1478 static ieee80211_rx_result debug_noinline
1479 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1480 {
1481         struct sk_buff *skb = rx->skb;
1482         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1483         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1484         int keyidx;
1485         int hdrlen;
1486         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1487         struct ieee80211_key *sta_ptk = NULL;
1488         int mmie_keyidx = -1;
1489         __le16 fc;
1490         const struct ieee80211_cipher_scheme *cs = NULL;
1491
1492         /*
1493          * Key selection 101
1494          *
1495          * There are four types of keys:
1496          *  - GTK (group keys)
1497          *  - IGTK (group keys for management frames)
1498          *  - PTK (pairwise keys)
1499          *  - STK (station-to-station pairwise keys)
1500          *
1501          * When selecting a key, we have to distinguish between multicast
1502          * (including broadcast) and unicast frames, the latter can only
1503          * use PTKs and STKs while the former always use GTKs and IGTKs.
1504          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1505          * unicast frames can also use key indices like GTKs. Hence, if we
1506          * don't have a PTK/STK we check the key index for a WEP key.
1507          *
1508          * Note that in a regular BSS, multicast frames are sent by the
1509          * AP only, associated stations unicast the frame to the AP first
1510          * which then multicasts it on their behalf.
1511          *
1512          * There is also a slight problem in IBSS mode: GTKs are negotiated
1513          * with each station, that is something we don't currently handle.
1514          * The spec seems to expect that one negotiates the same key with
1515          * every station but there's no such requirement; VLANs could be
1516          * possible.
1517          */
1518
1519         /*
1520          * No point in finding a key and decrypting if the frame is neither
1521          * addressed to us nor a multicast frame.
1522          */
1523         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1524                 return RX_CONTINUE;
1525
1526         /* start without a key */
1527         rx->key = NULL;
1528         fc = hdr->frame_control;
1529
1530         if (rx->sta) {
1531                 int keyid = rx->sta->ptk_idx;
1532
1533                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1534                         cs = rx->sta->cipher_scheme;
1535                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1536                         if (unlikely(keyid < 0))
1537                                 return RX_DROP_UNUSABLE;
1538                 }
1539                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1540         }
1541
1542         if (!ieee80211_has_protected(fc))
1543                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1544
1545         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1546                 rx->key = sta_ptk;
1547                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1548                     (status->flag & RX_FLAG_IV_STRIPPED))
1549                         return RX_CONTINUE;
1550                 /* Skip decryption if the frame is not protected. */
1551                 if (!ieee80211_has_protected(fc))
1552                         return RX_CONTINUE;
1553         } else if (mmie_keyidx >= 0) {
1554                 /* Broadcast/multicast robust management frame / BIP */
1555                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1556                     (status->flag & RX_FLAG_IV_STRIPPED))
1557                         return RX_CONTINUE;
1558
1559                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1560                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1561                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1562                 if (rx->sta)
1563                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1564                 if (!rx->key)
1565                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1566         } else if (!ieee80211_has_protected(fc)) {
1567                 /*
1568                  * The frame was not protected, so skip decryption. However, we
1569                  * need to set rx->key if there is a key that could have been
1570                  * used so that the frame may be dropped if encryption would
1571                  * have been expected.
1572                  */
1573                 struct ieee80211_key *key = NULL;
1574                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1575                 int i;
1576
1577                 if (ieee80211_is_mgmt(fc) &&
1578                     is_multicast_ether_addr(hdr->addr1) &&
1579                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1580                         rx->key = key;
1581                 else {
1582                         if (rx->sta) {
1583                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1584                                         key = rcu_dereference(rx->sta->gtk[i]);
1585                                         if (key)
1586                                                 break;
1587                                 }
1588                         }
1589                         if (!key) {
1590                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1591                                         key = rcu_dereference(sdata->keys[i]);
1592                                         if (key)
1593                                                 break;
1594                                 }
1595                         }
1596                         if (key)
1597                                 rx->key = key;
1598                 }
1599                 return RX_CONTINUE;
1600         } else {
1601                 u8 keyid;
1602
1603                 /*
1604                  * The device doesn't give us the IV so we won't be
1605                  * able to look up the key. That's ok though, we
1606                  * don't need to decrypt the frame, we just won't
1607                  * be able to keep statistics accurate.
1608                  * Except for key threshold notifications, should
1609                  * we somehow allow the driver to tell us which key
1610                  * the hardware used if this flag is set?
1611                  */
1612                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1613                     (status->flag & RX_FLAG_IV_STRIPPED))
1614                         return RX_CONTINUE;
1615
1616                 hdrlen = ieee80211_hdrlen(fc);
1617
1618                 if (cs) {
1619                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1620
1621                         if (unlikely(keyidx < 0))
1622                                 return RX_DROP_UNUSABLE;
1623                 } else {
1624                         if (rx->skb->len < 8 + hdrlen)
1625                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1626                         /*
1627                          * no need to call ieee80211_wep_get_keyidx,
1628                          * it verifies a bunch of things we've done already
1629                          */
1630                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1631                         keyidx = keyid >> 6;
1632                 }
1633
1634                 /* check per-station GTK first, if multicast packet */
1635                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1636                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1637
1638                 /* if not found, try default key */
1639                 if (!rx->key) {
1640                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1641
1642                         /*
1643                          * RSNA-protected unicast frames should always be
1644                          * sent with pairwise or station-to-station keys,
1645                          * but for WEP we allow using a key index as well.
1646                          */
1647                         if (rx->key &&
1648                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1649                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1650                             !is_multicast_ether_addr(hdr->addr1))
1651                                 rx->key = NULL;
1652                 }
1653         }
1654
1655         if (rx->key) {
1656                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1657                         return RX_DROP_MONITOR;
1658
1659                 rx->key->tx_rx_count++;
1660                 /* TODO: add threshold stuff again */
1661         } else {
1662                 return RX_DROP_MONITOR;
1663         }
1664
1665         switch (rx->key->conf.cipher) {
1666         case WLAN_CIPHER_SUITE_WEP40:
1667         case WLAN_CIPHER_SUITE_WEP104:
1668                 result = ieee80211_crypto_wep_decrypt(rx);
1669                 break;
1670         case WLAN_CIPHER_SUITE_TKIP:
1671                 result = ieee80211_crypto_tkip_decrypt(rx);
1672                 break;
1673         case WLAN_CIPHER_SUITE_CCMP:
1674                 result = ieee80211_crypto_ccmp_decrypt(
1675                         rx, IEEE80211_CCMP_MIC_LEN);
1676                 break;
1677         case WLAN_CIPHER_SUITE_CCMP_256:
1678                 result = ieee80211_crypto_ccmp_decrypt(
1679                         rx, IEEE80211_CCMP_256_MIC_LEN);
1680                 break;
1681         case WLAN_CIPHER_SUITE_AES_CMAC:
1682                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1683                 break;
1684         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1685                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1686                 break;
1687         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1688         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1689                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1690                 break;
1691         case WLAN_CIPHER_SUITE_GCMP:
1692         case WLAN_CIPHER_SUITE_GCMP_256:
1693                 result = ieee80211_crypto_gcmp_decrypt(rx);
1694                 break;
1695         default:
1696                 result = ieee80211_crypto_hw_decrypt(rx);
1697         }
1698
1699         /* the hdr variable is invalid after the decrypt handlers */
1700
1701         /* either the frame has been decrypted or will be dropped */
1702         status->flag |= RX_FLAG_DECRYPTED;
1703
1704         return result;
1705 }
1706
1707 static inline struct ieee80211_fragment_entry *
1708 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1709                          unsigned int frag, unsigned int seq, int rx_queue,
1710                          struct sk_buff **skb)
1711 {
1712         struct ieee80211_fragment_entry *entry;
1713
1714         entry = &sdata->fragments[sdata->fragment_next++];
1715         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1716                 sdata->fragment_next = 0;
1717
1718         if (!skb_queue_empty(&entry->skb_list))
1719                 __skb_queue_purge(&entry->skb_list);
1720
1721         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1722         *skb = NULL;
1723         entry->first_frag_time = jiffies;
1724         entry->seq = seq;
1725         entry->rx_queue = rx_queue;
1726         entry->last_frag = frag;
1727         entry->ccmp = 0;
1728         entry->extra_len = 0;
1729
1730         return entry;
1731 }
1732
1733 static inline struct ieee80211_fragment_entry *
1734 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1735                           unsigned int frag, unsigned int seq,
1736                           int rx_queue, struct ieee80211_hdr *hdr)
1737 {
1738         struct ieee80211_fragment_entry *entry;
1739         int i, idx;
1740
1741         idx = sdata->fragment_next;
1742         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1743                 struct ieee80211_hdr *f_hdr;
1744
1745                 idx--;
1746                 if (idx < 0)
1747                         idx = IEEE80211_FRAGMENT_MAX - 1;
1748
1749                 entry = &sdata->fragments[idx];
1750                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1751                     entry->rx_queue != rx_queue ||
1752                     entry->last_frag + 1 != frag)
1753                         continue;
1754
1755                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1756
1757                 /*
1758                  * Check ftype and addresses are equal, else check next fragment
1759                  */
1760                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1761                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1762                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1763                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1764                         continue;
1765
1766                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1767                         __skb_queue_purge(&entry->skb_list);
1768                         continue;
1769                 }
1770                 return entry;
1771         }
1772
1773         return NULL;
1774 }
1775
1776 static ieee80211_rx_result debug_noinline
1777 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1778 {
1779         struct ieee80211_hdr *hdr;
1780         u16 sc;
1781         __le16 fc;
1782         unsigned int frag, seq;
1783         struct ieee80211_fragment_entry *entry;
1784         struct sk_buff *skb;
1785         struct ieee80211_rx_status *status;
1786
1787         hdr = (struct ieee80211_hdr *)rx->skb->data;
1788         fc = hdr->frame_control;
1789
1790         if (ieee80211_is_ctl(fc))
1791                 return RX_CONTINUE;
1792
1793         sc = le16_to_cpu(hdr->seq_ctrl);
1794         frag = sc & IEEE80211_SCTL_FRAG;
1795
1796         if (is_multicast_ether_addr(hdr->addr1)) {
1797                 rx->local->dot11MulticastReceivedFrameCount++;
1798                 goto out_no_led;
1799         }
1800
1801         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1802                 goto out;
1803
1804         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1805
1806         if (skb_linearize(rx->skb))
1807                 return RX_DROP_UNUSABLE;
1808
1809         /*
1810          *  skb_linearize() might change the skb->data and
1811          *  previously cached variables (in this case, hdr) need to
1812          *  be refreshed with the new data.
1813          */
1814         hdr = (struct ieee80211_hdr *)rx->skb->data;
1815         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1816
1817         if (frag == 0) {
1818                 /* This is the first fragment of a new frame. */
1819                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1820                                                  rx->seqno_idx, &(rx->skb));
1821                 if (rx->key &&
1822                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1823                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
1824                     ieee80211_has_protected(fc)) {
1825                         int queue = rx->security_idx;
1826                         /* Store CCMP PN so that we can verify that the next
1827                          * fragment has a sequential PN value. */
1828                         entry->ccmp = 1;
1829                         memcpy(entry->last_pn,
1830                                rx->key->u.ccmp.rx_pn[queue],
1831                                IEEE80211_CCMP_PN_LEN);
1832                 }
1833                 return RX_QUEUED;
1834         }
1835
1836         /* This is a fragment for a frame that should already be pending in
1837          * fragment cache. Add this fragment to the end of the pending entry.
1838          */
1839         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1840                                           rx->seqno_idx, hdr);
1841         if (!entry) {
1842                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1843                 return RX_DROP_MONITOR;
1844         }
1845
1846         /* Verify that MPDUs within one MSDU have sequential PN values.
1847          * (IEEE 802.11i, 8.3.3.4.5) */
1848         if (entry->ccmp) {
1849                 int i;
1850                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1851                 int queue;
1852                 if (!rx->key ||
1853                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1854                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
1855                         return RX_DROP_UNUSABLE;
1856                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1857                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1858                         pn[i]++;
1859                         if (pn[i])
1860                                 break;
1861                 }
1862                 queue = rx->security_idx;
1863                 rpn = rx->key->u.ccmp.rx_pn[queue];
1864                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1865                         return RX_DROP_UNUSABLE;
1866                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1867         }
1868
1869         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1870         __skb_queue_tail(&entry->skb_list, rx->skb);
1871         entry->last_frag = frag;
1872         entry->extra_len += rx->skb->len;
1873         if (ieee80211_has_morefrags(fc)) {
1874                 rx->skb = NULL;
1875                 return RX_QUEUED;
1876         }
1877
1878         rx->skb = __skb_dequeue(&entry->skb_list);
1879         if (skb_tailroom(rx->skb) < entry->extra_len) {
1880                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1881                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1882                                               GFP_ATOMIC))) {
1883                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1884                         __skb_queue_purge(&entry->skb_list);
1885                         return RX_DROP_UNUSABLE;
1886                 }
1887         }
1888         while ((skb = __skb_dequeue(&entry->skb_list))) {
1889                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1890                 dev_kfree_skb(skb);
1891         }
1892
1893         /* Complete frame has been reassembled - process it now */
1894         status = IEEE80211_SKB_RXCB(rx->skb);
1895         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1896
1897  out:
1898         ieee80211_led_rx(rx->local);
1899  out_no_led:
1900         if (rx->sta)
1901                 rx->sta->rx_packets++;
1902         return RX_CONTINUE;
1903 }
1904
1905 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1906 {
1907         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1908                 return -EACCES;
1909
1910         return 0;
1911 }
1912
1913 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1914 {
1915         struct sk_buff *skb = rx->skb;
1916         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1917
1918         /*
1919          * Pass through unencrypted frames if the hardware has
1920          * decrypted them already.
1921          */
1922         if (status->flag & RX_FLAG_DECRYPTED)
1923                 return 0;
1924
1925         /* Drop unencrypted frames if key is set. */
1926         if (unlikely(!ieee80211_has_protected(fc) &&
1927                      !ieee80211_is_nullfunc(fc) &&
1928                      ieee80211_is_data(fc) && rx->key))
1929                 return -EACCES;
1930
1931         return 0;
1932 }
1933
1934 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1935 {
1936         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1937         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1938         __le16 fc = hdr->frame_control;
1939
1940         /*
1941          * Pass through unencrypted frames if the hardware has
1942          * decrypted them already.
1943          */
1944         if (status->flag & RX_FLAG_DECRYPTED)
1945                 return 0;
1946
1947         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1948                 if (unlikely(!ieee80211_has_protected(fc) &&
1949                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1950                              rx->key)) {
1951                         if (ieee80211_is_deauth(fc) ||
1952                             ieee80211_is_disassoc(fc))
1953                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1954                                                              rx->skb->data,
1955                                                              rx->skb->len);
1956                         return -EACCES;
1957                 }
1958                 /* BIP does not use Protected field, so need to check MMIE */
1959                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1960                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1961                         if (ieee80211_is_deauth(fc) ||
1962                             ieee80211_is_disassoc(fc))
1963                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1964                                                              rx->skb->data,
1965                                                              rx->skb->len);
1966                         return -EACCES;
1967                 }
1968                 /*
1969                  * When using MFP, Action frames are not allowed prior to
1970                  * having configured keys.
1971                  */
1972                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1973                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1974                         return -EACCES;
1975         }
1976
1977         return 0;
1978 }
1979
1980 static int
1981 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1982 {
1983         struct ieee80211_sub_if_data *sdata = rx->sdata;
1984         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1985         bool check_port_control = false;
1986         struct ethhdr *ehdr;
1987         int ret;
1988
1989         *port_control = false;
1990         if (ieee80211_has_a4(hdr->frame_control) &&
1991             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1992                 return -1;
1993
1994         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1995             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1996
1997                 if (!sdata->u.mgd.use_4addr)
1998                         return -1;
1999                 else
2000                         check_port_control = true;
2001         }
2002
2003         if (is_multicast_ether_addr(hdr->addr1) &&
2004             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2005                 return -1;
2006
2007         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2008         if (ret < 0)
2009                 return ret;
2010
2011         ehdr = (struct ethhdr *) rx->skb->data;
2012         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2013                 *port_control = true;
2014         else if (check_port_control)
2015                 return -1;
2016
2017         return 0;
2018 }
2019
2020 /*
2021  * requires that rx->skb is a frame with ethernet header
2022  */
2023 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2024 {
2025         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2026                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2027         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2028
2029         /*
2030          * Allow EAPOL frames to us/the PAE group address regardless
2031          * of whether the frame was encrypted or not.
2032          */
2033         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2034             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2035              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2036                 return true;
2037
2038         if (ieee80211_802_1x_port_control(rx) ||
2039             ieee80211_drop_unencrypted(rx, fc))
2040                 return false;
2041
2042         return true;
2043 }
2044
2045 /*
2046  * requires that rx->skb is a frame with ethernet header
2047  */
2048 static void
2049 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2050 {
2051         struct ieee80211_sub_if_data *sdata = rx->sdata;
2052         struct net_device *dev = sdata->dev;
2053         struct sk_buff *skb, *xmit_skb;
2054         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2055         struct sta_info *dsta;
2056         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2057
2058         dev->stats.rx_packets++;
2059         dev->stats.rx_bytes += rx->skb->len;
2060
2061         skb = rx->skb;
2062         xmit_skb = NULL;
2063
2064         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2065              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2066             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2067             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2068             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2069                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2070                         /*
2071                          * send multicast frames both to higher layers in
2072                          * local net stack and back to the wireless medium
2073                          */
2074                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2075                         if (!xmit_skb)
2076                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2077                                                     dev->name);
2078                 } else {
2079                         dsta = sta_info_get(sdata, skb->data);
2080                         if (dsta) {
2081                                 /*
2082                                  * The destination station is associated to
2083                                  * this AP (in this VLAN), so send the frame
2084                                  * directly to it and do not pass it to local
2085                                  * net stack.
2086                                  */
2087                                 xmit_skb = skb;
2088                                 skb = NULL;
2089                         }
2090                 }
2091         }
2092
2093 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2094         if (skb) {
2095                 /* 'align' will only take the values 0 or 2 here since all
2096                  * frames are required to be aligned to 2-byte boundaries
2097                  * when being passed to mac80211; the code here works just
2098                  * as well if that isn't true, but mac80211 assumes it can
2099                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2100                  */
2101                 int align;
2102
2103                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2104                 if (align) {
2105                         if (WARN_ON(skb_headroom(skb) < 3)) {
2106                                 dev_kfree_skb(skb);
2107                                 skb = NULL;
2108                         } else {
2109                                 u8 *data = skb->data;
2110                                 size_t len = skb_headlen(skb);
2111                                 skb->data -= align;
2112                                 memmove(skb->data, data, len);
2113                                 skb_set_tail_pointer(skb, len);
2114                         }
2115                 }
2116         }
2117 #endif
2118
2119         if (skb) {
2120                 /* deliver to local stack */
2121                 skb->protocol = eth_type_trans(skb, dev);
2122                 memset(skb->cb, 0, sizeof(skb->cb));
2123                 if (rx->local->napi)
2124                         napi_gro_receive(rx->local->napi, skb);
2125                 else
2126                         netif_receive_skb(skb);
2127         }
2128
2129         if (xmit_skb) {
2130                 /*
2131                  * Send to wireless media and increase priority by 256 to
2132                  * keep the received priority instead of reclassifying
2133                  * the frame (see cfg80211_classify8021d).
2134                  */
2135                 xmit_skb->priority += 256;
2136                 xmit_skb->protocol = htons(ETH_P_802_3);
2137                 skb_reset_network_header(xmit_skb);
2138                 skb_reset_mac_header(xmit_skb);
2139                 dev_queue_xmit(xmit_skb);
2140         }
2141 }
2142
2143 static ieee80211_rx_result debug_noinline
2144 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2145 {
2146         struct net_device *dev = rx->sdata->dev;
2147         struct sk_buff *skb = rx->skb;
2148         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2149         __le16 fc = hdr->frame_control;
2150         struct sk_buff_head frame_list;
2151         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2152
2153         if (unlikely(!ieee80211_is_data(fc)))
2154                 return RX_CONTINUE;
2155
2156         if (unlikely(!ieee80211_is_data_present(fc)))
2157                 return RX_DROP_MONITOR;
2158
2159         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2160                 return RX_CONTINUE;
2161
2162         if (ieee80211_has_a4(hdr->frame_control) &&
2163             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2164             !rx->sdata->u.vlan.sta)
2165                 return RX_DROP_UNUSABLE;
2166
2167         if (is_multicast_ether_addr(hdr->addr1) &&
2168             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2169               rx->sdata->u.vlan.sta) ||
2170              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2171               rx->sdata->u.mgd.use_4addr)))
2172                 return RX_DROP_UNUSABLE;
2173
2174         skb->dev = dev;
2175         __skb_queue_head_init(&frame_list);
2176
2177         if (skb_linearize(skb))
2178                 return RX_DROP_UNUSABLE;
2179
2180         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2181                                  rx->sdata->vif.type,
2182                                  rx->local->hw.extra_tx_headroom, true);
2183
2184         while (!skb_queue_empty(&frame_list)) {
2185                 rx->skb = __skb_dequeue(&frame_list);
2186
2187                 if (!ieee80211_frame_allowed(rx, fc)) {
2188                         dev_kfree_skb(rx->skb);
2189                         continue;
2190                 }
2191
2192                 ieee80211_deliver_skb(rx);
2193         }
2194
2195         return RX_QUEUED;
2196 }
2197
2198 #ifdef CONFIG_MAC80211_MESH
2199 static ieee80211_rx_result
2200 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2201 {
2202         struct ieee80211_hdr *fwd_hdr, *hdr;
2203         struct ieee80211_tx_info *info;
2204         struct ieee80211s_hdr *mesh_hdr;
2205         struct sk_buff *skb = rx->skb, *fwd_skb;
2206         struct ieee80211_local *local = rx->local;
2207         struct ieee80211_sub_if_data *sdata = rx->sdata;
2208         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2209         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2210         u16 q, hdrlen;
2211
2212         hdr = (struct ieee80211_hdr *) skb->data;
2213         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2214
2215         /* make sure fixed part of mesh header is there, also checks skb len */
2216         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2217                 return RX_DROP_MONITOR;
2218
2219         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2220
2221         /* make sure full mesh header is there, also checks skb len */
2222         if (!pskb_may_pull(rx->skb,
2223                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2224                 return RX_DROP_MONITOR;
2225
2226         /* reload pointers */
2227         hdr = (struct ieee80211_hdr *) skb->data;
2228         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2229
2230         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2231                 return RX_DROP_MONITOR;
2232
2233         /* frame is in RMC, don't forward */
2234         if (ieee80211_is_data(hdr->frame_control) &&
2235             is_multicast_ether_addr(hdr->addr1) &&
2236             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2237                 return RX_DROP_MONITOR;
2238
2239         if (!ieee80211_is_data(hdr->frame_control) ||
2240             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2241                 return RX_CONTINUE;
2242
2243         if (!mesh_hdr->ttl)
2244                 return RX_DROP_MONITOR;
2245
2246         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2247                 struct mesh_path *mppath;
2248                 char *proxied_addr;
2249                 char *mpp_addr;
2250
2251                 if (is_multicast_ether_addr(hdr->addr1)) {
2252                         mpp_addr = hdr->addr3;
2253                         proxied_addr = mesh_hdr->eaddr1;
2254                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2255                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2256                         mpp_addr = hdr->addr4;
2257                         proxied_addr = mesh_hdr->eaddr2;
2258                 } else {
2259                         return RX_DROP_MONITOR;
2260                 }
2261
2262                 rcu_read_lock();
2263                 mppath = mpp_path_lookup(sdata, proxied_addr);
2264                 if (!mppath) {
2265                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2266                 } else {
2267                         spin_lock_bh(&mppath->state_lock);
2268                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2269                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2270                         spin_unlock_bh(&mppath->state_lock);
2271                 }
2272                 rcu_read_unlock();
2273         }
2274
2275         /* Frame has reached destination.  Don't forward */
2276         if (!is_multicast_ether_addr(hdr->addr1) &&
2277             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2278                 return RX_CONTINUE;
2279
2280         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2281         if (ieee80211_queue_stopped(&local->hw, q)) {
2282                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2283                 return RX_DROP_MONITOR;
2284         }
2285         skb_set_queue_mapping(skb, q);
2286
2287         if (!--mesh_hdr->ttl) {
2288                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2289                 goto out;
2290         }
2291
2292         if (!ifmsh->mshcfg.dot11MeshForwarding)
2293                 goto out;
2294
2295         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2296         if (!fwd_skb) {
2297                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2298                                     sdata->name);
2299                 goto out;
2300         }
2301
2302         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2303         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2304         info = IEEE80211_SKB_CB(fwd_skb);
2305         memset(info, 0, sizeof(*info));
2306         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2307         info->control.vif = &rx->sdata->vif;
2308         info->control.jiffies = jiffies;
2309         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2310                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2311                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2312                 /* update power mode indication when forwarding */
2313                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2314         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2315                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2316                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2317         } else {
2318                 /* unable to resolve next hop */
2319                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2320                                    fwd_hdr->addr3, 0,
2321                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2322                                    fwd_hdr->addr2);
2323                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2324                 kfree_skb(fwd_skb);
2325                 return RX_DROP_MONITOR;
2326         }
2327
2328         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2329         ieee80211_add_pending_skb(local, fwd_skb);
2330  out:
2331         if (is_multicast_ether_addr(hdr->addr1) ||
2332             sdata->dev->flags & IFF_PROMISC)
2333                 return RX_CONTINUE;
2334         else
2335                 return RX_DROP_MONITOR;
2336 }
2337 #endif
2338
2339 static ieee80211_rx_result debug_noinline
2340 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2341 {
2342         struct ieee80211_sub_if_data *sdata = rx->sdata;
2343         struct ieee80211_local *local = rx->local;
2344         struct net_device *dev = sdata->dev;
2345         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2346         __le16 fc = hdr->frame_control;
2347         bool port_control;
2348         int err;
2349
2350         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2351                 return RX_CONTINUE;
2352
2353         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2354                 return RX_DROP_MONITOR;
2355
2356         if (rx->sta) {
2357                 /* The seqno index has the same property as needed
2358                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2359                  * for non-QoS-data frames. Here we know it's a data
2360                  * frame, so count MSDUs.
2361                  */
2362                 rx->sta->rx_msdu[rx->seqno_idx]++;
2363         }
2364
2365         /*
2366          * Send unexpected-4addr-frame event to hostapd. For older versions,
2367          * also drop the frame to cooked monitor interfaces.
2368          */
2369         if (ieee80211_has_a4(hdr->frame_control) &&
2370             sdata->vif.type == NL80211_IFTYPE_AP) {
2371                 if (rx->sta &&
2372                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2373                         cfg80211_rx_unexpected_4addr_frame(
2374                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2375                 return RX_DROP_MONITOR;
2376         }
2377
2378         err = __ieee80211_data_to_8023(rx, &port_control);
2379         if (unlikely(err))
2380                 return RX_DROP_UNUSABLE;
2381
2382         if (!ieee80211_frame_allowed(rx, fc))
2383                 return RX_DROP_MONITOR;
2384
2385         /* directly handle TDLS channel switch requests/responses */
2386         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2387                                                 cpu_to_be16(ETH_P_TDLS))) {
2388                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2389
2390                 if (pskb_may_pull(rx->skb,
2391                                   offsetof(struct ieee80211_tdls_data, u)) &&
2392                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2393                     tf->category == WLAN_CATEGORY_TDLS &&
2394                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2395                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2396                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2397                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2398                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2399                         if (rx->sta)
2400                                 rx->sta->rx_packets++;
2401
2402                         return RX_QUEUED;
2403                 }
2404         }
2405
2406         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2407             unlikely(port_control) && sdata->bss) {
2408                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2409                                      u.ap);
2410                 dev = sdata->dev;
2411                 rx->sdata = sdata;
2412         }
2413
2414         rx->skb->dev = dev;
2415
2416         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2417             !is_multicast_ether_addr(
2418                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2419             (!local->scanning &&
2420              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2421                         mod_timer(&local->dynamic_ps_timer, jiffies +
2422                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2423         }
2424
2425         ieee80211_deliver_skb(rx);
2426
2427         return RX_QUEUED;
2428 }
2429
2430 static ieee80211_rx_result debug_noinline
2431 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2432 {
2433         struct sk_buff *skb = rx->skb;
2434         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2435         struct tid_ampdu_rx *tid_agg_rx;
2436         u16 start_seq_num;
2437         u16 tid;
2438
2439         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2440                 return RX_CONTINUE;
2441
2442         if (ieee80211_is_back_req(bar->frame_control)) {
2443                 struct {
2444                         __le16 control, start_seq_num;
2445                 } __packed bar_data;
2446
2447                 if (!rx->sta)
2448                         return RX_DROP_MONITOR;
2449
2450                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2451                                   &bar_data, sizeof(bar_data)))
2452                         return RX_DROP_MONITOR;
2453
2454                 tid = le16_to_cpu(bar_data.control) >> 12;
2455
2456                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2457                 if (!tid_agg_rx)
2458                         return RX_DROP_MONITOR;
2459
2460                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2461
2462                 /* reset session timer */
2463                 if (tid_agg_rx->timeout)
2464                         mod_timer(&tid_agg_rx->session_timer,
2465                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2466
2467                 spin_lock(&tid_agg_rx->reorder_lock);
2468                 /* release stored frames up to start of BAR */
2469                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2470                                                  start_seq_num, frames);
2471                 spin_unlock(&tid_agg_rx->reorder_lock);
2472
2473                 kfree_skb(skb);
2474                 return RX_QUEUED;
2475         }
2476
2477         /*
2478          * After this point, we only want management frames,
2479          * so we can drop all remaining control frames to
2480          * cooked monitor interfaces.
2481          */
2482         return RX_DROP_MONITOR;
2483 }
2484
2485 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2486                                            struct ieee80211_mgmt *mgmt,
2487                                            size_t len)
2488 {
2489         struct ieee80211_local *local = sdata->local;
2490         struct sk_buff *skb;
2491         struct ieee80211_mgmt *resp;
2492
2493         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2494                 /* Not to own unicast address */
2495                 return;
2496         }
2497
2498         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2499             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2500                 /* Not from the current AP or not associated yet. */
2501                 return;
2502         }
2503
2504         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2505                 /* Too short SA Query request frame */
2506                 return;
2507         }
2508
2509         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2510         if (skb == NULL)
2511                 return;
2512
2513         skb_reserve(skb, local->hw.extra_tx_headroom);
2514         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2515         memset(resp, 0, 24);
2516         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2517         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2518         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2519         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2520                                           IEEE80211_STYPE_ACTION);
2521         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2522         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2523         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2524         memcpy(resp->u.action.u.sa_query.trans_id,
2525                mgmt->u.action.u.sa_query.trans_id,
2526                WLAN_SA_QUERY_TR_ID_LEN);
2527
2528         ieee80211_tx_skb(sdata, skb);
2529 }
2530
2531 static ieee80211_rx_result debug_noinline
2532 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2533 {
2534         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2535         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2536
2537         /*
2538          * From here on, look only at management frames.
2539          * Data and control frames are already handled,
2540          * and unknown (reserved) frames are useless.
2541          */
2542         if (rx->skb->len < 24)
2543                 return RX_DROP_MONITOR;
2544
2545         if (!ieee80211_is_mgmt(mgmt->frame_control))
2546                 return RX_DROP_MONITOR;
2547
2548         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2549             ieee80211_is_beacon(mgmt->frame_control) &&
2550             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2551                 int sig = 0;
2552
2553                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2554                         sig = status->signal;
2555
2556                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2557                                             rx->skb->data, rx->skb->len,
2558                                             status->freq, sig);
2559                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2560         }
2561
2562         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2563                 return RX_DROP_MONITOR;
2564
2565         if (ieee80211_drop_unencrypted_mgmt(rx))
2566                 return RX_DROP_UNUSABLE;
2567
2568         return RX_CONTINUE;
2569 }
2570
2571 static ieee80211_rx_result debug_noinline
2572 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2573 {
2574         struct ieee80211_local *local = rx->local;
2575         struct ieee80211_sub_if_data *sdata = rx->sdata;
2576         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2577         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2578         int len = rx->skb->len;
2579
2580         if (!ieee80211_is_action(mgmt->frame_control))
2581                 return RX_CONTINUE;
2582
2583         /* drop too small frames */
2584         if (len < IEEE80211_MIN_ACTION_SIZE)
2585                 return RX_DROP_UNUSABLE;
2586
2587         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2588             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2589             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2590                 return RX_DROP_UNUSABLE;
2591
2592         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2593                 return RX_DROP_UNUSABLE;
2594
2595         switch (mgmt->u.action.category) {
2596         case WLAN_CATEGORY_HT:
2597                 /* reject HT action frames from stations not supporting HT */
2598                 if (!rx->sta->sta.ht_cap.ht_supported)
2599                         goto invalid;
2600
2601                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2602                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2603                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2604                     sdata->vif.type != NL80211_IFTYPE_AP &&
2605                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2606                         break;
2607
2608                 /* verify action & smps_control/chanwidth are present */
2609                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2610                         goto invalid;
2611
2612                 switch (mgmt->u.action.u.ht_smps.action) {
2613                 case WLAN_HT_ACTION_SMPS: {
2614                         struct ieee80211_supported_band *sband;
2615                         enum ieee80211_smps_mode smps_mode;
2616
2617                         /* convert to HT capability */
2618                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2619                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2620                                 smps_mode = IEEE80211_SMPS_OFF;
2621                                 break;
2622                         case WLAN_HT_SMPS_CONTROL_STATIC:
2623                                 smps_mode = IEEE80211_SMPS_STATIC;
2624                                 break;
2625                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2626                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2627                                 break;
2628                         default:
2629                                 goto invalid;
2630                         }
2631
2632                         /* if no change do nothing */
2633                         if (rx->sta->sta.smps_mode == smps_mode)
2634                                 goto handled;
2635                         rx->sta->sta.smps_mode = smps_mode;
2636
2637                         sband = rx->local->hw.wiphy->bands[status->band];
2638
2639                         rate_control_rate_update(local, sband, rx->sta,
2640                                                  IEEE80211_RC_SMPS_CHANGED);
2641                         goto handled;
2642                 }
2643                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2644                         struct ieee80211_supported_band *sband;
2645                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2646                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2647
2648                         /* If it doesn't support 40 MHz it can't change ... */
2649                         if (!(rx->sta->sta.ht_cap.cap &
2650                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2651                                 goto handled;
2652
2653                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2654                                 max_bw = IEEE80211_STA_RX_BW_20;
2655                         else
2656                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2657
2658                         /* set cur_max_bandwidth and recalc sta bw */
2659                         rx->sta->cur_max_bandwidth = max_bw;
2660                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2661
2662                         if (rx->sta->sta.bandwidth == new_bw)
2663                                 goto handled;
2664
2665                         rx->sta->sta.bandwidth = new_bw;
2666                         sband = rx->local->hw.wiphy->bands[status->band];
2667
2668                         rate_control_rate_update(local, sband, rx->sta,
2669                                                  IEEE80211_RC_BW_CHANGED);
2670                         goto handled;
2671                 }
2672                 default:
2673                         goto invalid;
2674                 }
2675
2676                 break;
2677         case WLAN_CATEGORY_PUBLIC:
2678                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2679                         goto invalid;
2680                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2681                         break;
2682                 if (!rx->sta)
2683                         break;
2684                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2685                         break;
2686                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2687                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2688                         break;
2689                 if (len < offsetof(struct ieee80211_mgmt,
2690                                    u.action.u.ext_chan_switch.variable))
2691                         goto invalid;
2692                 goto queue;
2693         case WLAN_CATEGORY_VHT:
2694                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2695                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2696                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2697                     sdata->vif.type != NL80211_IFTYPE_AP &&
2698                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2699                         break;
2700
2701                 /* verify action code is present */
2702                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2703                         goto invalid;
2704
2705                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2706                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2707                         u8 opmode;
2708
2709                         /* verify opmode is present */
2710                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2711                                 goto invalid;
2712
2713                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2714
2715                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2716                                                     opmode, status->band,
2717                                                     false);
2718                         goto handled;
2719                 }
2720                 default:
2721                         break;
2722                 }
2723                 break;
2724         case WLAN_CATEGORY_BACK:
2725                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2726                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2727                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2728                     sdata->vif.type != NL80211_IFTYPE_AP &&
2729                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2730                         break;
2731
2732                 /* verify action_code is present */
2733                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2734                         break;
2735
2736                 switch (mgmt->u.action.u.addba_req.action_code) {
2737                 case WLAN_ACTION_ADDBA_REQ:
2738                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2739                                    sizeof(mgmt->u.action.u.addba_req)))
2740                                 goto invalid;
2741                         break;
2742                 case WLAN_ACTION_ADDBA_RESP:
2743                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2744                                    sizeof(mgmt->u.action.u.addba_resp)))
2745                                 goto invalid;
2746                         break;
2747                 case WLAN_ACTION_DELBA:
2748                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2749                                    sizeof(mgmt->u.action.u.delba)))
2750                                 goto invalid;
2751                         break;
2752                 default:
2753                         goto invalid;
2754                 }
2755
2756                 goto queue;
2757         case WLAN_CATEGORY_SPECTRUM_MGMT:
2758                 /* verify action_code is present */
2759                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2760                         break;
2761
2762                 switch (mgmt->u.action.u.measurement.action_code) {
2763                 case WLAN_ACTION_SPCT_MSR_REQ:
2764                         if (status->band != IEEE80211_BAND_5GHZ)
2765                                 break;
2766
2767                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2768                                    sizeof(mgmt->u.action.u.measurement)))
2769                                 break;
2770
2771                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2772                                 break;
2773
2774                         ieee80211_process_measurement_req(sdata, mgmt, len);
2775                         goto handled;
2776                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2777                         u8 *bssid;
2778                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2779                                    sizeof(mgmt->u.action.u.chan_switch)))
2780                                 break;
2781
2782                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2783                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2784                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2785                                 break;
2786
2787                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2788                                 bssid = sdata->u.mgd.bssid;
2789                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2790                                 bssid = sdata->u.ibss.bssid;
2791                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2792                                 bssid = mgmt->sa;
2793                         else
2794                                 break;
2795
2796                         if (!ether_addr_equal(mgmt->bssid, bssid))
2797                                 break;
2798
2799                         goto queue;
2800                         }
2801                 }
2802                 break;
2803         case WLAN_CATEGORY_SA_QUERY:
2804                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2805                            sizeof(mgmt->u.action.u.sa_query)))
2806                         break;
2807
2808                 switch (mgmt->u.action.u.sa_query.action) {
2809                 case WLAN_ACTION_SA_QUERY_REQUEST:
2810                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2811                                 break;
2812                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2813                         goto handled;
2814                 }
2815                 break;
2816         case WLAN_CATEGORY_SELF_PROTECTED:
2817                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2818                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2819                         break;
2820
2821                 switch (mgmt->u.action.u.self_prot.action_code) {
2822                 case WLAN_SP_MESH_PEERING_OPEN:
2823                 case WLAN_SP_MESH_PEERING_CLOSE:
2824                 case WLAN_SP_MESH_PEERING_CONFIRM:
2825                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2826                                 goto invalid;
2827                         if (sdata->u.mesh.user_mpm)
2828                                 /* userspace handles this frame */
2829                                 break;
2830                         goto queue;
2831                 case WLAN_SP_MGK_INFORM:
2832                 case WLAN_SP_MGK_ACK:
2833                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2834                                 goto invalid;
2835                         break;
2836                 }
2837                 break;
2838         case WLAN_CATEGORY_MESH_ACTION:
2839                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2840                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2841                         break;
2842
2843                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2844                         break;
2845                 if (mesh_action_is_path_sel(mgmt) &&
2846                     !mesh_path_sel_is_hwmp(sdata))
2847                         break;
2848                 goto queue;
2849         }
2850
2851         return RX_CONTINUE;
2852
2853  invalid:
2854         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2855         /* will return in the next handlers */
2856         return RX_CONTINUE;
2857
2858  handled:
2859         if (rx->sta)
2860                 rx->sta->rx_packets++;
2861         dev_kfree_skb(rx->skb);
2862         return RX_QUEUED;
2863
2864  queue:
2865         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2866         skb_queue_tail(&sdata->skb_queue, rx->skb);
2867         ieee80211_queue_work(&local->hw, &sdata->work);
2868         if (rx->sta)
2869                 rx->sta->rx_packets++;
2870         return RX_QUEUED;
2871 }
2872
2873 static ieee80211_rx_result debug_noinline
2874 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2875 {
2876         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2877         int sig = 0;
2878
2879         /* skip known-bad action frames and return them in the next handler */
2880         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2881                 return RX_CONTINUE;
2882
2883         /*
2884          * Getting here means the kernel doesn't know how to handle
2885          * it, but maybe userspace does ... include returned frames
2886          * so userspace can register for those to know whether ones
2887          * it transmitted were processed or returned.
2888          */
2889
2890         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2891                 sig = status->signal;
2892
2893         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2894                              rx->skb->data, rx->skb->len, 0)) {
2895                 if (rx->sta)
2896                         rx->sta->rx_packets++;
2897                 dev_kfree_skb(rx->skb);
2898                 return RX_QUEUED;
2899         }
2900
2901         return RX_CONTINUE;
2902 }
2903
2904 static ieee80211_rx_result debug_noinline
2905 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2906 {
2907         struct ieee80211_local *local = rx->local;
2908         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2909         struct sk_buff *nskb;
2910         struct ieee80211_sub_if_data *sdata = rx->sdata;
2911         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2912
2913         if (!ieee80211_is_action(mgmt->frame_control))
2914                 return RX_CONTINUE;
2915
2916         /*
2917          * For AP mode, hostapd is responsible for handling any action
2918          * frames that we didn't handle, including returning unknown
2919          * ones. For all other modes we will return them to the sender,
2920          * setting the 0x80 bit in the action category, as required by
2921          * 802.11-2012 9.24.4.
2922          * Newer versions of hostapd shall also use the management frame
2923          * registration mechanisms, but older ones still use cooked
2924          * monitor interfaces so push all frames there.
2925          */
2926         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2927             (sdata->vif.type == NL80211_IFTYPE_AP ||
2928              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2929                 return RX_DROP_MONITOR;
2930
2931         if (is_multicast_ether_addr(mgmt->da))
2932                 return RX_DROP_MONITOR;
2933
2934         /* do not return rejected action frames */
2935         if (mgmt->u.action.category & 0x80)
2936                 return RX_DROP_UNUSABLE;
2937
2938         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2939                                GFP_ATOMIC);
2940         if (nskb) {
2941                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2942
2943                 nmgmt->u.action.category |= 0x80;
2944                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2945                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2946
2947                 memset(nskb->cb, 0, sizeof(nskb->cb));
2948
2949                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2950                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2951
2952                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2953                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2954                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2955                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2956                                 info->hw_queue =
2957                                         local->hw.offchannel_tx_hw_queue;
2958                 }
2959
2960                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2961                                             status->band);
2962         }
2963         dev_kfree_skb(rx->skb);
2964         return RX_QUEUED;
2965 }
2966
2967 static ieee80211_rx_result debug_noinline
2968 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2969 {
2970         struct ieee80211_sub_if_data *sdata = rx->sdata;
2971         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2972         __le16 stype;
2973
2974         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2975
2976         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2977             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2978             sdata->vif.type != NL80211_IFTYPE_OCB &&
2979             sdata->vif.type != NL80211_IFTYPE_STATION)
2980                 return RX_DROP_MONITOR;
2981
2982         switch (stype) {
2983         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2984         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2985         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2986                 /* process for all: mesh, mlme, ibss */
2987                 break;
2988         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2989         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2990         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2991         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2992                 if (is_multicast_ether_addr(mgmt->da) &&
2993                     !is_broadcast_ether_addr(mgmt->da))
2994                         return RX_DROP_MONITOR;
2995
2996                 /* process only for station */
2997                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2998                         return RX_DROP_MONITOR;
2999                 break;
3000         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3001                 /* process only for ibss and mesh */
3002                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3003                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3004                         return RX_DROP_MONITOR;
3005                 break;
3006         default:
3007                 return RX_DROP_MONITOR;
3008         }
3009
3010         /* queue up frame and kick off work to process it */
3011         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3012         skb_queue_tail(&sdata->skb_queue, rx->skb);
3013         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3014         if (rx->sta)
3015                 rx->sta->rx_packets++;
3016
3017         return RX_QUEUED;
3018 }
3019
3020 /* TODO: use IEEE80211_RX_FRAGMENTED */
3021 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3022                                         struct ieee80211_rate *rate)
3023 {
3024         struct ieee80211_sub_if_data *sdata;
3025         struct ieee80211_local *local = rx->local;
3026         struct sk_buff *skb = rx->skb, *skb2;
3027         struct net_device *prev_dev = NULL;
3028         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3029         int needed_headroom;
3030
3031         /*
3032          * If cooked monitor has been processed already, then
3033          * don't do it again. If not, set the flag.
3034          */
3035         if (rx->flags & IEEE80211_RX_CMNTR)
3036                 goto out_free_skb;
3037         rx->flags |= IEEE80211_RX_CMNTR;
3038
3039         /* If there are no cooked monitor interfaces, just free the SKB */
3040         if (!local->cooked_mntrs)
3041                 goto out_free_skb;
3042
3043         /* vendor data is long removed here */
3044         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3045         /* room for the radiotap header based on driver features */
3046         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3047
3048         if (skb_headroom(skb) < needed_headroom &&
3049             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3050                 goto out_free_skb;
3051
3052         /* prepend radiotap information */
3053         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3054                                          false);
3055
3056         skb_set_mac_header(skb, 0);
3057         skb->ip_summed = CHECKSUM_UNNECESSARY;
3058         skb->pkt_type = PACKET_OTHERHOST;
3059         skb->protocol = htons(ETH_P_802_2);
3060
3061         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3062                 if (!ieee80211_sdata_running(sdata))
3063                         continue;
3064
3065                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3066                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3067                         continue;
3068
3069                 if (prev_dev) {
3070                         skb2 = skb_clone(skb, GFP_ATOMIC);
3071                         if (skb2) {
3072                                 skb2->dev = prev_dev;
3073                                 netif_receive_skb(skb2);
3074                         }
3075                 }
3076
3077                 prev_dev = sdata->dev;
3078                 sdata->dev->stats.rx_packets++;
3079                 sdata->dev->stats.rx_bytes += skb->len;
3080         }
3081
3082         if (prev_dev) {
3083                 skb->dev = prev_dev;
3084                 netif_receive_skb(skb);
3085                 return;
3086         }
3087
3088  out_free_skb:
3089         dev_kfree_skb(skb);
3090 }
3091
3092 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3093                                          ieee80211_rx_result res)
3094 {
3095         switch (res) {
3096         case RX_DROP_MONITOR:
3097                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3098                 if (rx->sta)
3099                         rx->sta->rx_dropped++;
3100                 /* fall through */
3101         case RX_CONTINUE: {
3102                 struct ieee80211_rate *rate = NULL;
3103                 struct ieee80211_supported_band *sband;
3104                 struct ieee80211_rx_status *status;
3105
3106                 status = IEEE80211_SKB_RXCB((rx->skb));
3107
3108                 sband = rx->local->hw.wiphy->bands[status->band];
3109                 if (!(status->flag & RX_FLAG_HT) &&
3110                     !(status->flag & RX_FLAG_VHT))
3111                         rate = &sband->bitrates[status->rate_idx];
3112
3113                 ieee80211_rx_cooked_monitor(rx, rate);
3114                 break;
3115                 }
3116         case RX_DROP_UNUSABLE:
3117                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3118                 if (rx->sta)
3119                         rx->sta->rx_dropped++;
3120                 dev_kfree_skb(rx->skb);
3121                 break;
3122         case RX_QUEUED:
3123                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3124                 break;
3125         }
3126 }
3127
3128 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3129                                   struct sk_buff_head *frames)
3130 {
3131         ieee80211_rx_result res = RX_DROP_MONITOR;
3132         struct sk_buff *skb;
3133
3134 #define CALL_RXH(rxh)                   \
3135         do {                            \
3136                 res = rxh(rx);          \
3137                 if (res != RX_CONTINUE) \
3138                         goto rxh_next;  \
3139         } while (0);
3140
3141         /* Lock here to avoid hitting all of the data used in the RX
3142          * path (e.g. key data, station data, ...) concurrently when
3143          * a frame is released from the reorder buffer due to timeout
3144          * from the timer, potentially concurrently with RX from the
3145          * driver.
3146          */
3147         spin_lock_bh(&rx->local->rx_path_lock);
3148
3149         while ((skb = __skb_dequeue(frames))) {
3150                 /*
3151                  * all the other fields are valid across frames
3152                  * that belong to an aMPDU since they are on the
3153                  * same TID from the same station
3154                  */
3155                 rx->skb = skb;
3156
3157                 CALL_RXH(ieee80211_rx_h_check_more_data)
3158                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3159                 CALL_RXH(ieee80211_rx_h_sta_process)
3160                 CALL_RXH(ieee80211_rx_h_decrypt)
3161                 CALL_RXH(ieee80211_rx_h_defragment)
3162                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3163                 /* must be after MMIC verify so header is counted in MPDU mic */
3164 #ifdef CONFIG_MAC80211_MESH
3165                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3166                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3167 #endif
3168                 CALL_RXH(ieee80211_rx_h_amsdu)
3169                 CALL_RXH(ieee80211_rx_h_data)
3170
3171                 /* special treatment -- needs the queue */
3172                 res = ieee80211_rx_h_ctrl(rx, frames);
3173                 if (res != RX_CONTINUE)
3174                         goto rxh_next;
3175
3176                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3177                 CALL_RXH(ieee80211_rx_h_action)
3178                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3179                 CALL_RXH(ieee80211_rx_h_action_return)
3180                 CALL_RXH(ieee80211_rx_h_mgmt)
3181
3182  rxh_next:
3183                 ieee80211_rx_handlers_result(rx, res);
3184
3185 #undef CALL_RXH
3186         }
3187
3188         spin_unlock_bh(&rx->local->rx_path_lock);
3189 }
3190
3191 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3192 {
3193         struct sk_buff_head reorder_release;
3194         ieee80211_rx_result res = RX_DROP_MONITOR;
3195
3196         __skb_queue_head_init(&reorder_release);
3197
3198 #define CALL_RXH(rxh)                   \
3199         do {                            \
3200                 res = rxh(rx);          \
3201                 if (res != RX_CONTINUE) \
3202                         goto rxh_next;  \
3203         } while (0);
3204
3205         CALL_RXH(ieee80211_rx_h_check_dup)
3206         CALL_RXH(ieee80211_rx_h_check)
3207
3208         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3209
3210         ieee80211_rx_handlers(rx, &reorder_release);
3211         return;
3212
3213  rxh_next:
3214         ieee80211_rx_handlers_result(rx, res);
3215
3216 #undef CALL_RXH
3217 }
3218
3219 /*
3220  * This function makes calls into the RX path, therefore
3221  * it has to be invoked under RCU read lock.
3222  */
3223 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3224 {
3225         struct sk_buff_head frames;
3226         struct ieee80211_rx_data rx = {
3227                 .sta = sta,
3228                 .sdata = sta->sdata,
3229                 .local = sta->local,
3230                 /* This is OK -- must be QoS data frame */
3231                 .security_idx = tid,
3232                 .seqno_idx = tid,
3233                 .flags = 0,
3234         };
3235         struct tid_ampdu_rx *tid_agg_rx;
3236
3237         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3238         if (!tid_agg_rx)
3239                 return;
3240
3241         __skb_queue_head_init(&frames);
3242
3243         spin_lock(&tid_agg_rx->reorder_lock);
3244         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3245         spin_unlock(&tid_agg_rx->reorder_lock);
3246
3247         ieee80211_rx_handlers(&rx, &frames);
3248 }
3249
3250 /* main receive path */
3251
3252 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3253                                  struct ieee80211_hdr *hdr)
3254 {
3255         struct ieee80211_sub_if_data *sdata = rx->sdata;
3256         struct sk_buff *skb = rx->skb;
3257         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3258         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3259         int multicast = is_multicast_ether_addr(hdr->addr1);
3260
3261         switch (sdata->vif.type) {
3262         case NL80211_IFTYPE_STATION:
3263                 if (!bssid && !sdata->u.mgd.use_4addr)
3264                         return false;
3265                 if (!multicast &&
3266                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3267                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3268                             sdata->u.mgd.use_4addr)
3269                                 return false;
3270                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3271                 }
3272                 break;
3273         case NL80211_IFTYPE_ADHOC:
3274                 if (!bssid)
3275                         return false;
3276                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3277                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3278                         return false;
3279                 if (ieee80211_is_beacon(hdr->frame_control)) {
3280                         return true;
3281                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3282                         return false;
3283                 } else if (!multicast &&
3284                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3285                         if (!(sdata->dev->flags & IFF_PROMISC))
3286                                 return false;
3287                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3288                 } else if (!rx->sta) {
3289                         int rate_idx;
3290                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3291                                 rate_idx = 0; /* TODO: HT/VHT rates */
3292                         else
3293                                 rate_idx = status->rate_idx;
3294                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3295                                                  BIT(rate_idx));
3296                 }
3297                 break;
3298         case NL80211_IFTYPE_OCB:
3299                 if (!bssid)
3300                         return false;
3301                 if (ieee80211_is_beacon(hdr->frame_control)) {
3302                         return false;
3303                 } else if (!is_broadcast_ether_addr(bssid)) {
3304                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3305                         return false;
3306                 } else if (!multicast &&
3307                            !ether_addr_equal(sdata->dev->dev_addr,
3308                                              hdr->addr1)) {
3309                         /* if we are in promisc mode we also accept
3310                          * packets not destined for us
3311                          */
3312                         if (!(sdata->dev->flags & IFF_PROMISC))
3313                                 return false;
3314                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3315                 } else if (!rx->sta) {
3316                         int rate_idx;
3317                         if (status->flag & RX_FLAG_HT)
3318                                 rate_idx = 0; /* TODO: HT rates */
3319                         else
3320                                 rate_idx = status->rate_idx;
3321                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3322                                                 BIT(rate_idx));
3323                 }
3324                 break;
3325         case NL80211_IFTYPE_MESH_POINT:
3326                 if (!multicast &&
3327                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3328                         if (!(sdata->dev->flags & IFF_PROMISC))
3329                                 return false;
3330
3331                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3332                 }
3333                 break;
3334         case NL80211_IFTYPE_AP_VLAN:
3335         case NL80211_IFTYPE_AP:
3336                 if (!bssid) {
3337                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3338                                 return false;
3339                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3340                         /*
3341                          * Accept public action frames even when the
3342                          * BSSID doesn't match, this is used for P2P
3343                          * and location updates. Note that mac80211
3344                          * itself never looks at these frames.
3345                          */
3346                         if (!multicast &&
3347                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3348                                 return false;
3349                         if (ieee80211_is_public_action(hdr, skb->len))
3350                                 return true;
3351                         if (!ieee80211_is_beacon(hdr->frame_control))
3352                                 return false;
3353                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3354                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3355                         /* ignore data frames to TDLS-peers */
3356                         if (ieee80211_is_data(hdr->frame_control))
3357                                 return false;
3358                         /* ignore action frames to TDLS-peers */
3359                         if (ieee80211_is_action(hdr->frame_control) &&
3360                             !ether_addr_equal(bssid, hdr->addr1))
3361                                 return false;
3362                 }
3363                 break;
3364         case NL80211_IFTYPE_WDS:
3365                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3366                         return false;
3367                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3368                         return false;
3369                 break;
3370         case NL80211_IFTYPE_P2P_DEVICE:
3371                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3372                     !ieee80211_is_probe_req(hdr->frame_control) &&
3373                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3374                     !ieee80211_is_beacon(hdr->frame_control))
3375                         return false;
3376                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3377                     !multicast)
3378                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3379                 break;
3380         default:
3381                 /* should never get here */
3382                 WARN_ON_ONCE(1);
3383                 break;
3384         }
3385
3386         return true;
3387 }
3388
3389 /*
3390  * This function returns whether or not the SKB
3391  * was destined for RX processing or not, which,
3392  * if consume is true, is equivalent to whether
3393  * or not the skb was consumed.
3394  */
3395 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3396                                             struct sk_buff *skb, bool consume)
3397 {
3398         struct ieee80211_local *local = rx->local;
3399         struct ieee80211_sub_if_data *sdata = rx->sdata;
3400         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3401         struct ieee80211_hdr *hdr = (void *)skb->data;
3402
3403         rx->skb = skb;
3404         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3405
3406         if (!prepare_for_handlers(rx, hdr))
3407                 return false;
3408
3409         if (!consume) {
3410                 skb = skb_copy(skb, GFP_ATOMIC);
3411                 if (!skb) {
3412                         if (net_ratelimit())
3413                                 wiphy_debug(local->hw.wiphy,
3414                                         "failed to copy skb for %s\n",
3415                                         sdata->name);
3416                         return true;
3417                 }
3418
3419                 rx->skb = skb;
3420         }
3421
3422         ieee80211_invoke_rx_handlers(rx);
3423         return true;
3424 }
3425
3426 /*
3427  * This is the actual Rx frames handler. as it belongs to Rx path it must
3428  * be called with rcu_read_lock protection.
3429  */
3430 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3431                                          struct sk_buff *skb)
3432 {
3433         struct ieee80211_local *local = hw_to_local(hw);
3434         struct ieee80211_sub_if_data *sdata;
3435         struct ieee80211_hdr *hdr;
3436         __le16 fc;
3437         struct ieee80211_rx_data rx;
3438         struct ieee80211_sub_if_data *prev;
3439         struct sta_info *sta, *prev_sta;
3440         struct rhash_head *tmp;
3441         int err = 0;
3442
3443         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3444         memset(&rx, 0, sizeof(rx));
3445         rx.skb = skb;
3446         rx.local = local;
3447
3448         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3449                 local->dot11ReceivedFragmentCount++;
3450
3451         if (ieee80211_is_mgmt(fc)) {
3452                 /* drop frame if too short for header */
3453                 if (skb->len < ieee80211_hdrlen(fc))
3454                         err = -ENOBUFS;
3455                 else
3456                         err = skb_linearize(skb);
3457         } else {
3458                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3459         }
3460
3461         if (err) {
3462                 dev_kfree_skb(skb);
3463                 return;
3464         }
3465
3466         hdr = (struct ieee80211_hdr *)skb->data;
3467         ieee80211_parse_qos(&rx);
3468         ieee80211_verify_alignment(&rx);
3469
3470         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3471                      ieee80211_is_beacon(hdr->frame_control)))
3472                 ieee80211_scan_rx(local, skb);
3473
3474         if (ieee80211_is_data(fc)) {
3475                 const struct bucket_table *tbl;
3476
3477                 prev_sta = NULL;
3478
3479                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3480
3481                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3482                         if (!prev_sta) {
3483                                 prev_sta = sta;
3484                                 continue;
3485                         }
3486
3487                         rx.sta = prev_sta;
3488                         rx.sdata = prev_sta->sdata;
3489                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3490
3491                         prev_sta = sta;
3492                 }
3493
3494                 if (prev_sta) {
3495                         rx.sta = prev_sta;
3496                         rx.sdata = prev_sta->sdata;
3497
3498                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3499                                 return;
3500                         goto out;
3501                 }
3502         }
3503
3504         prev = NULL;
3505
3506         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3507                 if (!ieee80211_sdata_running(sdata))
3508                         continue;
3509
3510                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3511                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3512                         continue;
3513
3514                 /*
3515                  * frame is destined for this interface, but if it's
3516                  * not also for the previous one we handle that after
3517                  * the loop to avoid copying the SKB once too much
3518                  */
3519
3520                 if (!prev) {
3521                         prev = sdata;
3522                         continue;
3523                 }
3524
3525                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3526                 rx.sdata = prev;
3527                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3528
3529                 prev = sdata;
3530         }
3531
3532         if (prev) {
3533                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3534                 rx.sdata = prev;
3535
3536                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3537                         return;
3538         }
3539
3540  out:
3541         dev_kfree_skb(skb);
3542 }
3543
3544 /*
3545  * This is the receive path handler. It is called by a low level driver when an
3546  * 802.11 MPDU is received from the hardware.
3547  */
3548 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3549 {
3550         struct ieee80211_local *local = hw_to_local(hw);
3551         struct ieee80211_rate *rate = NULL;
3552         struct ieee80211_supported_band *sband;
3553         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3554
3555         WARN_ON_ONCE(softirq_count() == 0);
3556
3557         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3558                 goto drop;
3559
3560         sband = local->hw.wiphy->bands[status->band];
3561         if (WARN_ON(!sband))
3562                 goto drop;
3563
3564         /*
3565          * If we're suspending, it is possible although not too likely
3566          * that we'd be receiving frames after having already partially
3567          * quiesced the stack. We can't process such frames then since
3568          * that might, for example, cause stations to be added or other
3569          * driver callbacks be invoked.
3570          */
3571         if (unlikely(local->quiescing || local->suspended))
3572                 goto drop;
3573
3574         /* We might be during a HW reconfig, prevent Rx for the same reason */
3575         if (unlikely(local->in_reconfig))
3576                 goto drop;
3577
3578         /*
3579          * The same happens when we're not even started,
3580          * but that's worth a warning.
3581          */
3582         if (WARN_ON(!local->started))
3583                 goto drop;
3584
3585         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3586                 /*
3587                  * Validate the rate, unless a PLCP error means that
3588                  * we probably can't have a valid rate here anyway.
3589                  */
3590
3591                 if (status->flag & RX_FLAG_HT) {
3592                         /*
3593                          * rate_idx is MCS index, which can be [0-76]
3594                          * as documented on:
3595                          *
3596                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3597                          *
3598                          * Anything else would be some sort of driver or
3599                          * hardware error. The driver should catch hardware
3600                          * errors.
3601                          */
3602                         if (WARN(status->rate_idx > 76,
3603                                  "Rate marked as an HT rate but passed "
3604                                  "status->rate_idx is not "
3605                                  "an MCS index [0-76]: %d (0x%02x)\n",
3606                                  status->rate_idx,
3607                                  status->rate_idx))
3608                                 goto drop;
3609                 } else if (status->flag & RX_FLAG_VHT) {
3610                         if (WARN_ONCE(status->rate_idx > 9 ||
3611                                       !status->vht_nss ||
3612                                       status->vht_nss > 8,
3613                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3614                                       status->rate_idx, status->vht_nss))
3615                                 goto drop;
3616                 } else {
3617                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3618                                 goto drop;
3619                         rate = &sband->bitrates[status->rate_idx];
3620                 }
3621         }
3622
3623         status->rx_flags = 0;
3624
3625         /*
3626          * key references and virtual interfaces are protected using RCU
3627          * and this requires that we are in a read-side RCU section during
3628          * receive processing
3629          */
3630         rcu_read_lock();
3631
3632         /*
3633          * Frames with failed FCS/PLCP checksum are not returned,
3634          * all other frames are returned without radiotap header
3635          * if it was previously present.
3636          * Also, frames with less than 16 bytes are dropped.
3637          */
3638         skb = ieee80211_rx_monitor(local, skb, rate);
3639         if (!skb) {
3640                 rcu_read_unlock();
3641                 return;
3642         }
3643
3644         ieee80211_tpt_led_trig_rx(local,
3645                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3646                         skb->len);
3647         __ieee80211_rx_handle_packet(hw, skb);
3648
3649         rcu_read_unlock();
3650
3651         return;
3652  drop:
3653         kfree_skb(skb);
3654 }
3655 EXPORT_SYMBOL(ieee80211_rx);
3656
3657 /* This is a version of the rx handler that can be called from hard irq
3658  * context. Post the skb on the queue and schedule the tasklet */
3659 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3660 {
3661         struct ieee80211_local *local = hw_to_local(hw);
3662
3663         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3664
3665         skb->pkt_type = IEEE80211_RX_MSG;
3666         skb_queue_tail(&local->skb_queue, skb);
3667         tasklet_schedule(&local->tasklet);
3668 }
3669 EXPORT_SYMBOL(ieee80211_rx_irqsafe);